JP7414942B2 - Pressure reducing valve - Google Patents

Description

The present invention relates to a pressure reducing valve.

A pressure reducing valve may be required that has a higher pressure reducing effect as the flow rate decreases and a lower pressure reducing effect as the flow rate increases. For example, when fluid flows through a pipe from a tank installed at a high place to a building at a low place, pressure loss occurs due to friction within the pipe and valves installed in the middle. For example, if you set the pressure of the supply source (such as a pump truck) based on a high flow rate and send fluid while changing the flow rate, there will be no problem with the fluid pressure if the flow rate is high, but the flow rate will decrease. In this case, there is a problem that the pressure of the fluid exceeds the allowable pressure of the piping because the pressure loss during liquid feeding becomes small.

Japanese Patent Application Publication No. 10-149223

As mentioned above, there is a demand for adjusting the pressure of the fluid within the piping depending on the flow rate of the fluid flowing within the piping. One of the objects of the present invention is to provide a pressure reducing valve that exhibits a pressure reducing effect depending on the flow rate in a pipe.

A pressure reducing valve according to one aspect of the present invention includes a first pipe body, and at least one second pipe body connected to the first pipe body through at least one opening provided in the first pipe body. and a valve body provided inside the first tube and having a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first tube acts.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands, and the total area of the opening is equal to or smaller than the first pipe body. is larger than the flow path area of The main body may have two of the openings and two of the second tubes each connected to the first tube through the two openings.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through a first opening provided in the first pipe body. , a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe acts, a pressure guiding pipe, and a valve body provided inside the first pipe.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the first opening that is not covered by the valve body expands.

The valve body separates the first pipe body into a first part on the pressure receiving surface side and a second part on the opposite side to the first part in the direction along the first axis, and the pressure guide pipe includes: The first part and the second part are connected to each other, and a second opening is provided at a position away from the pressure receiving surface into which the fluid flowing through the first part flows.

The pressure guiding pipe may be rotatably provided on the valve body and may have a protrusion that protrudes from the pressure receiving surface. The second opening may be included in the protrusion. The pressure impulse pipe may further include a cover provided with a gap between it and the second opening. In a state where the dynamic pressure acts on the pressure receiving surface and the portion of the first opening that is not blocked by the valve body is expanded to the maximum, the second opening is aligned with the first opening in the direction along the first axis. It may be located between the inlet of one tube and the first opening.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through an opening provided in the first pipe body, The valve body includes a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe acts, and a connection path, and is provided inside the first pipe.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands.

The valve body separates the first pipe body into a first part on the pressure receiving surface side and a second part on the opposite side to the first part in the direction along the first axis, and the connecting path is The first portion and the second portion are connected to each other, and includes a connection port provided on the pressure receiving surface side, and an enlarged diameter portion communicating with the connection port and having an inner diameter larger than the connection port.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through an opening provided in the first pipe body, a valve body provided inside the first pipe body, the valve body having a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe body acts, and a skirt portion;
A biasing member that contacts the valve body and biases the valve body from a direction opposite to the direction in which the dynamic pressure acts is provided.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands. The skirt portion protrudes beyond a biasing surface where the biasing member contacts the valve body, and surrounds the biasing member.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through an opening provided in the first pipe body, It has a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe acts, and a stopper located on an outer circumferential surface connected to the pressure receiving surface, and a valve body provided inside the first pipe. , is provided.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands. The first pipe body has a locking surface that locks the stopper, and when the stopper is locked to the locking surface, movement of the valve body along the first axis is restricted. . The device may further include a spacer provided between the locking surface and the stopper in the direction along the first axis.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through an opening provided in the first pipe body, A pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe acts, a connecting path, and a shielding member provided with a gap between the pressure receiving surface and the interior of the first pipe. and a valve body provided in the valve body.

A first axis of the first pipe intersects a second axis of the second pipe, and the valve body moves along the first axis when the dynamic pressure acts on the pressure receiving surface. As the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands.

The valve body separates the first pipe body into a first part on the pressure receiving surface side and a second part on the opposite side to the first part in the direction along the first axis, and the connecting path is The first portion and the second portion are connected, and the shielding member overlaps the connection path in a direction along the first axis.

A pressure reducing valve according to one aspect of the present invention includes a main body having a first pipe body and a second pipe body connected to the first pipe body through an opening provided in the first pipe body, The valve body has a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe acts, and is provided inside the first pipe.

A first axis of the first pipe intersects with a second axis of the second pipe, and the valve body has a first portion on the pressure receiving surface side and a first portion on the pressure receiving surface side in a direction along the first axis. The first tube is separated into one section and an opposite second section.

The first pipe body has a groove connecting the first part and the second part on an inner circumferential surface facing the valve body, and in a state where the dynamic pressure is not acting on the pressure receiving surface, The opening has a portion that is not blocked by the valve body and a portion that is closed by the valve body, and the valve body has a part that is not blocked by the valve body, and the valve body is configured to absorb the pressure when the dynamic pressure acts on the pressure receiving surface. By moving along the first axis, the dynamic pressure acts on the pressure receiving surface, and the valve body moves, thereby expanding a portion of the opening that is not blocked by the valve body.

The groove has a first side wall located in the first portion and a second side wall located in the second portion, and when no fluid is flowing through the first tube, the first side wall It may be separated from the pressure receiving surface in the direction along the first axis. The groove may face the opening. The inner diameter of the first tube may be different from the inner diameter of the second tube.

According to the present invention, it is possible to provide a pressure reducing valve that exhibits a pressure reducing effect depending on the flow rate in a pipe.

FIG. 1 is a schematic diagram showing an example of an installation situation of a pressure reducing valve according to the first embodiment. FIG. 2 is a schematic partial sectional view of the pressure reducing valve according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the pressure reducing valve shown in FIG. 2 taken along line III-III. FIG. 4 is a schematic diagram showing the position of the valve body in the pressure reducing valve according to the first embodiment. FIG. 5 is a schematic partial sectional view of a pressure reducing valve according to a second embodiment. FIG. 6 is a schematic partial sectional view of a pressure reducing valve according to a third embodiment. FIG. 7 is a schematic front view of the valve body shown in FIG. 6. FIG. 8 is a schematic partial sectional view showing a pressure reducing valve including a spacer. FIG. 9 is a schematic partial sectional view of a pressure reducing valve according to a fourth embodiment. FIG. 10 is a schematic front view of the valve body shown in FIG. 9. FIG. 11 is a schematic partial sectional view of a pressure reducing valve according to a fifth embodiment. FIG. 12 is a schematic partial sectional view of a pressure reducing valve according to a fifth embodiment. FIG. 13 is a schematic partial sectional view of a pressure reducing valve according to a sixth embodiment. FIG. 14 is a schematic cross-sectional view of the pressure reducing valve shown in FIG. 13 taken along line XIV-XIV.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings.
In each embodiment, a pressure reducing valve provided in a flow path through which a liquid such as fresh water or seawater flows is disclosed as an example of a pressure reducing valve. The same structure as the pressure reducing valve according to each embodiment can also be applied to a flow path through which a multiphase flow in which gas such as gas or liquid and gas are mixed flows. A pressure reducing valve is, for example, an intermediary fitting for connecting hoses together.

The pressure reducing valve can also be used as an intermediary fitting used in other types of hose laying lines. Pressure reducing valves are used, for example, in seawater-based firefighting and irrigation systems, firefighting pump trucks with automatic pressure regulators, large-capacity foam firefighting systems at oil storage bases, alternative water injection lines in nuclear facilities, automatic water supply control lines using IOT/AI, etc., and other fluids. Can be used for automatic transfer control lines, etc.

[First embodiment]
FIG. 1 is a schematic diagram showing an example of an installation situation of a pressure reducing valve 100 according to the first embodiment. As shown in FIG. 1, the pressure reducing valve 100 includes a main body 1 having a first pipe body 10 and two second pipe bodies 21, 22, a connector 10A provided on the first pipe body 10, and a second pipe body 10A. It includes a connector 21A provided on the body 21 and a connector 22A provided on the second tube body 22. The pressure reducing valve 100 includes a valve body 30 (described later) provided inside the first pipe body 10, an adjustment member 40 provided in the first pipe body 10, and a discharge port 50 provided in the first pipe body 10. , further includes.

In the example shown in FIG. 1, the pressure reducing valve 100 is installed on an installation surface such as the ground, and is connected to flexible hoses H10, H21, and H22. A connector 10B is provided at the end of the hose H10. The hose H10 is connected to the connector 10A of the first tube body 10 by a connector 10B.

A connector 21B is provided at the end of the hose H21. The hose H21 is connected to the connector 21A of the second pipe body 21 by a connector 21B. A connector 22B is provided at the end of the hose H22. The hose H22 is connected to the connector 22A of the second tube body 22 by a connector 22B. The connectors 10B, 21B, 22B have, for example, the same structure as the connectors 10A, 21A, 22A without distinction between male and female, and are detachably connected to the connectors 10A, 21A, 22A.

The arrows shown in FIG. 1 indicate the direction of fluid flow. The fluid supplied from the hose H10, which is the primary side (inlet side) piping, passes through the pressure reducing valve 100 from the first pipe body 10 to the second pipe body 21 or the second pipe body 22, and then passes through the secondary pipe body (outlet side). ) Flows to hoses H21 and H22, which are piping.

FIG. 2 is a schematic partial sectional view of the pressure reducing valve 100 according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the pressure reducing valve 100 shown in FIG. 2 taken along line III-III. FIG. 2 shows the pressure reducing valve 100 viewed from the installation surface side (lower side). 2 and 3 show, as an example, before fluid is supplied to the pressure reducing valve 100.

As explained using FIG. 1, the pressure reducing valve 100 includes a main body 1 having a first pipe body 10 and second pipe bodies 21, 22, connectors 10A, 21A, 22A, a valve body 30, an adjustment member 40, and an exhaust valve. An outlet 50 is provided. As shown in FIG. 2, the pressure reducing valve 100 further includes a pressure guiding pipe 60 that the valve body 30 has, and a biasing member 70 located between the valve body 30 and the adjustment member 40.

In the example shown in FIG. 2, the first tubular body 10 has a cylindrical shape centered on the first axis AX1, and each of the second tubular bodies 21 and 22 has a cylindrical shape centered on the second axes AX21 and AX22. The second tube bodies 21 and 22 are connected to the first tube body 10 through two openings 13 and 14 (first openings) provided in the outer peripheral surface 11 of the first tube body 10, respectively. The main body 1 may be formed by integrating the first tube 10 and the second tubes 21 and 22, or may be formed as an assembly made of separate members.

The first axis AX1 of the first tube 10 intersects with the second axes AX21, AX22 of the second tubes 21, 22. In the example shown in FIG. 2, the first axis AX1 is perpendicular to the second axes AX21 and AX22. The second axis AX21 of the second tube 21 is located on the same straight line as the second axis AX22 of the second tube 22. The opening 13 and the opening 14 are located at positions 180 degrees symmetrical about the first axis AX1, and the opening 13 faces the opening 14.

Here, the direction along the first axis AX1 is defined as the axial direction Dx1. A direction moving away from the first axis AX1 centered around the first axis AX1 is defined as a radial direction Dr1. The radial direction Dr1 is, for example, a direction parallel to the second axes AX21 and AX22.

The first tubular body 10 has an end 10a and an end 10b opposite to the end 10a in the axial direction Dx1. A connector 10A is provided at the end 10a of the first tube body 10. The inner peripheral surface of the end portion 10b is provided with a first threaded portion S1 to which an adjustment member 40, which will be described later, is connected. The second tube bodies 21 and 22 have end portions 21a and 22a on opposite sides of the end portions connected to the openings 13 and 14, respectively. Connectors 21A and 22A are provided at the ends 21a and 22a of the second tube bodies 21 and 22, respectively.

Various shapes can be applied to the connectors 10A, 21A, 22A. The connectors 10A, 21A, and 22A have the same structure, for example, without distinction between male and female, and can connect the connectors 10B, 21B, and 22B shown in FIG. 1 detachably. The connectors 10A, 21A, and 22A may have male and female structures. Further, the sizes of the connectors 10A, 21A, 22A correspond to the inner diameter ID1 of the first tube 10 and the inner diameter ID21, ID22 of the second tubes 21, 22.

The flow direction of the fluid flowing through the first tube body 10 is mainly from the end portion 10a to the end portion 10b in the axial direction Dx1. The flow direction of the fluid flowing through the second pipe body 21 is from the opening 13 toward the end portion 21a. The flow direction of the fluid flowing through the second pipe body 22 is from the opening 14 toward the end portion 22a. In the main body 1 of the pressure reducing valve 100, the end 10a is the inlet, and the ends 21a and 22a are the outlets.

The first tube 10 has a first flow path 110 inside, and the second tubes 21 and 22 have second flow paths 121 and 122 inside. The second flow paths 121 and 122 communicate with the first flow path 110 via openings 13 and 14, respectively. The inner diameter ID1 of the first tube body 10 is different from the inner diameters ID21 and ID22 of the second tube bodies 21 and 22, for example.

In the example shown in FIG. 2, the inner diameter ID1 of the first tubular body 10 is larger than the inner diameters ID21 and ID22 of the second tubular bodies 21 and 22. From another point of view, the inner diameter ID1 of the first tube 10 is larger than the openings 13 and 14. The opening 13 is equal to the opening 14, and the inner diameter ID21 of the second tube 21 is equal to the inner diameter ID22 of the second tube 22.

The openings 13 and 14 correspond to the second pipe bodies 21 and 22 to be connected. For example, the area of the openings 13 and 14 is approximately equal to the flow path area of the second tubes 21 and 22. The flow path area is a cross-sectional area perpendicular to the flow direction of the first flow path 110 and the second flow paths 121, 122, which are fluid flow paths.

The total area of the two openings 13 and 14 is larger than the flow path area of the first tube 10, for example. In the pressure reducing valve 100, the total flow passage area of the second pipe bodies 21 and 22, which is the flow passage area on the secondary side, is larger than the flow passage area of the first pipe body 10, which is the primary side. Since the main body 1 has two second pipe bodies 21 and 22, the sum of the flow path area of the second pipe body 21 and the flow path area of the second pipe body 22 is equal to that of the secondary side of the pressure reducing valve 100. This is the flow path area.

The valve body 30 has a cylindrical shape extending along the first axis AX1. The valve body 30 has a pressure receiving surface 31 on the end 10a side, a pressure receiving surface 32 on the end 10b side, and an outer peripheral surface 33 connecting the pressure receiving surface 31 and the pressure receiving surface 32. The outer circumferential surface 33 of the valve body 30 faces the inner circumferential surface 12 of the first tube body 10 .

The valve body 30 further includes a connecting path 34 located in the center between the pressure receiving surfaces 31 and 32 along the first axis AX1. In the example shown in FIG. 2, the connection path 34 is a through hole that penetrates between the pressure receiving surface 31 and the pressure receiving surface 32. In the example shown in FIG. 2, the axis of the valve body 30 and the axis of the connection path 34 coincide with the first axis AX1. The connection path 34 may be provided in the valve body 30 offset from the axis of the valve body 30.

The pressure receiving surfaces 31 and 32 intersect with the first axis AX1, and in the example shown in FIG. 2, are perpendicular to the first axis AX1. The area of the pressure receiving surface 31 is approximately equal to the area of the pressure receiving surface 32. The valve body 30 is provided in the first flow path 110 in a movable state in the axial direction Dx1, and there is a gap between the outer peripheral surface 33 of the valve body 30 and the inner peripheral surface 12 of the first pipe body 10. It is formed. The gap may be large enough to allow the valve body 30 to move in the axial direction Dx1, and a smaller gap is preferable.

In the axial direction Dx1, the valve body 30 allows the first flow of the first pipe body 10 to flow into a first portion P1 on the pressure receiving surface 31 side and a second portion P2 on the opposite side to the first portion P1 (pressure receiving surface 32 side). Road 110 separates them from each other. As shown in FIG. 2, the first portion P1 is located on the end 10a side, and the second portion P2 is located on the end 10b side.

Before the valve body 30 in the example shown in FIGS. 2 and 3 is moved by the fluid (before the fluid is supplied to the pressure reducing valve 100), the outer peripheral surface 33 of the valve body 30 partially closes the openings 13 and 14, The openings 13 and 14 are not completely closed. In FIG. 3, the opening 13 is viewed from the end 21a side. In FIG. 3, the left side in the figure is the end 10a side, and the right side in the figure is the end 10b side.

The opening 13 has a portion O1 that is not closed by the outer peripheral surface 33 of the valve body 30 and a portion NO1 that is closed by the outer peripheral surface 33 of the valve body 30. The opening 14 has a portion O2 that is not closed by the outer peripheral surface 33 of the valve body 30, and a portion NO2 that is closed by the outer peripheral surface 33 of the valve body 30.

The unblocked portions O1 and O2 communicate the first portion P1 and the second flow paths 121 and 122. As shown in FIGS. 2 and 3, the openings 13 and 14 have unobstructed portions O1 and O2, so the fluid in the first portion P1 flows from the unobstructed portion O1 to the second portion O1 of the second pipe body 21. It flows into the flow path 121 and flows into the second flow path 122 of the second pipe body 22 from the unblocked portion O2.

Since the valve body 30 is provided so as to be movable in the axial direction Dx1, the sizes of the uncovered portions O1, O2 and the closed portions NO1, NO2 depend on the position of the valve body 30 in the axial direction Dx1. Varies depending on More specifically, when the valve body 30 moves toward the end portion 10b, the unoccluded portions O1 and O2 expand, and the obstructed portions NO1 and NO2 contract. On the other hand, when the valve body 30 moves toward the end portion 10a, the unclosed portions O1 and O2 contract, and the closed portions NO1 and NO2 expand.

For example, when the valve body 30 moves until the pressure receiving surface 31 coincides with the portions 13a, 14a of the openings 13, 14 closest to the end portion 10b, the openings 13, 14 and the unblocked portions O1, O2 The size matches. In this case, the sizes of the unoccluded portions O1 and O2 are maximum.

When the valve body 30 moves until the pressure receiving surface 31 coincides with the second axes AX21, AX22 in the radial direction Dr1, the pressure receiving surface 31 is located at the center of the openings 13, 14, so the unclosed portion O1, The sizes of O2 and the occluded portions NO1 and NO2 are approximately equal.

Next, the pressure guiding pipe 60 included in the valve body 30 will be explained. The pressure guiding pipe 60 has a straight pipe portion 61 provided in the connection path 34 and a protruding portion 62 including a portion protruding from the pressure receiving surface 31 toward the end portion 10a. The pressure guiding pipe 60 has a cylindrical shape extending along the axial direction Dx1 and centered on the first axis AX1. In the example shown in FIG. 2, the inner diameter ID60 of the pressure guiding pipe 60 is a uniform diameter from the straight pipe portion 61 to the protrusion portion 62. The flow path of the straight pipe portion 61 is communicated with the flow path of the protrusion portion 62 . The second portion P2 is connected to the first portion P1 by a pressure guiding pipe 60.

The pressure guiding pipe 60 moves along the axial direction Dx1 as the valve body 30 moves. As described above, since the axis of the valve body 30 and the axis of the connection path 34 coincide with the first axis AX1, the axis of the pressure guiding pipe 60 coincides with the first axis AX1. The length of the pressure guiding pipe 60 in the axial direction Dx1 is longer than the length of the valve body 30 in the axial direction Dx1. The end surface of the straight pipe portion 61 on the pressure receiving surface 32 side coincides with the pressure receiving surface 32 in the axial direction Dx1.

The protruding portion 62 includes a closing member 63 at the end on the end 10a side, a connecting portion 64 at the end on the end 10b side, and an opening 6a (second opening) between the closing member 63 and the connecting portion 64. ,have. A surface 631 of the closing member 63 intersects with the first axis AX1. In the example shown in FIG. 2, the surface 631 is perpendicular to the first axis AX1. The closing member 63 prevents the fluid flowing through the first portion P1 from flowing into the protrusion 62 along the axial direction Dx1.

The opening 6a is formed on the outer peripheral surface of the protrusion 62. From another point of view, the opening 6 is parallel to the first axis AX1. The opening 6a is spaced apart from the pressure receiving surface 31 in the axial direction Dx1. In the example shown in FIG. 3, the opening 6a has a circular shape when viewed from the end 21a side. The inner diameter ID61 of the opening 6a is, for example, 1/5 to 1/10 of the inner diameter ID1 of the first tube body 10. In addition to the circular shape, the opening 6a may have an elliptical shape or a rectangular shape, for example. The fluid flowing through the first portion P1 passes through the impulse pipe 60 from the opening 6a and flows into the second portion P2.

A connecting portion 36 is provided at the connecting port 35 of the connecting path 34 on the pressure receiving surface 31 side. The connecting portion 64 of the protruding portion 62 is connected to the connecting portion 36 . The protruding portion 62 is provided rotatably in the circumferential direction θ centering on the first axis AX1 by, for example, the connecting portions 36 and 64. Furthermore, the protrusion 62 may be detachably provided on the valve body 30, for example.

Various shapes can be applied to the connecting portions 36, 64. The connecting portion 64 is, for example, a thread formed on the outer peripheral surface of the protruding portion 62, and the connecting portion 36 has a thread corresponding to the connecting portion 64. In this case, the connecting portion 36 is female threaded and the connecting portion 64 is male threaded.

The pressure guiding pipe 60 can adjust the position of the opening 6a in the circumferential direction θ by rotating the protrusion 62, for example. In the example shown in FIGS. 2 and 3, the opening 6a opens toward the opening 13 side. In this case, the fluid flowing through the first portion P1 flows into the opening 6a from a direction opposite to the radial direction Dr1.

By orienting the opening 6a toward the opening 13 side, the fluid flowing through the first portion P1 is less likely to flow toward the opening 6a, and the fluid in the impulse pipe 60 is less susceptible to the dynamic pressure of the fluid flowing through the first portion P1. . The opening 6a may be directed toward the opening 14, or may be directed in another direction.

The pressure guiding tube 60 can adjust the distance L6 of the opening 6a from the pressure receiving surface 31 in the axial direction Dx1, for example, by rotating the protrusion 62. More specifically, the distance L6 can be reduced by rotating the protrusion 62 and moving the opening 6a closer to the pressure receiving surface 31. On the other hand, the distance L6 can be increased by rotating the protrusion 62 and moving the opening 6a away from the pressure receiving surface 31.

The adjustment member 40 is provided at the end portion 10b of the first tube body 10. The adjustment member 40 has a cylindrical shape extending along the axial direction Dx1. The axis of the adjustment member 40 coincides with the first axis AX1. The adjustment member 40 has an end surface 41 on the end 10a side and a second threaded portion S2 provided on the outer peripheral surface. The second threaded portion S2 has a shape corresponding to the first threaded portion S1. In the example shown in FIG. 2, the first threaded portion S1 is a female thread, and the second threaded portion S2 is a male thread.

The adjustment member 40 is rotatably provided in the circumferential direction θ by a first threaded portion S1 and a second threaded portion S2. Furthermore, the adjustment member 40 is provided, for example, in the first tubular body 10 in a detachable manner. The space between the adjustment member 40 and the first tube body 10 is sealed by a sealing member (not shown) or the like to prevent fluid from flowing out from the second portion P2.

By rotating the adjustment member 40, for example, the position of the adjustment member 40 in the axial direction Dx1 can be adjusted. The adjusting member 40 can rotate the pressure reducing valve 100 not only when fluid is flowing but also when no fluid is flowing.

The biasing member 70 extends along the axial direction Dx1 and is provided in the second portion P2 of the first tube body 10. The biasing member 70 has a contact portion 71 in contact with the pressure receiving surface 32 of the valve body 30, and a contact portion 72 on the opposite side of the contact portion 71. The contact portion 72 is in contact with the end surface 41 of the adjustment member 40.

The biasing member 70 biases the pressure receiving surface 32 from the end 10b side toward the end 10a side in the axial direction Dx1. The biasing member 70 is, for example, a coil spring. The biasing member 70 may be an elastic body such as rubber instead of a coil spring.

When the adjustment member 40 is moved, the contact portion 72 of the biasing member 70 moves together with the adjustment member 40. From another perspective, the adjustment member 40 can adjust the position of the contact portion 72 in the axial direction Dx1.

When the adjustment member 40 is moved from the end 10b side to the end 10a side in the axial direction Dx1, the contact portion 72 of the biasing member 70 moves toward the contact portion 71. When the contact portion 72 moves toward the contact portion 71, the biasing member 70 biases the pressure receiving surface 32 from the end portion 10b side toward the end portion 10a side in the axial direction Dx1. Therefore, the valve body 30 moves from the end 10b side to the end 10a side in the axial direction Dx1.

As the valve body 30 moves from the end 10b side to the end 10a side, the portions O1 and O2 not covered by the outer circumferential surface 33 are reduced. When the adjustment member 40 is moved from the end 10a side to the end 10b side in the axial direction Dx1, the uncovered portions O1 and O2 expand. By adjusting the position of the contact portion 72 of the biasing member 70 using the adjusting member 40, the sizes of the portions O1, O2 of the openings 13, 14 that are not blocked can be adjusted. From another point of view, the adjustment member 40 can adjust the opening degrees of the openings 13 and 14.

Since the adjustment member 40 is detachably attached to the first tubular body 10, the biasing member 70 can be replaced through the opening of the end portion 10b. For example, by replacing the biasing member 70, the biasing force applied to the valve body 30 can be changed. By changing the length of the biasing member 70, the sizes of the uncovered portions O1 and O2 can be changed.

As described above, the pressure reducing valve 100 includes the discharge port 50 for discharging fluid. Fluid such as liquid or gas in the second portion P2 is discharged from the discharge port 50. The discharge port 50 is located between the pressure receiving surface 32 of the valve body 30 and the end surface 41 of the adjustment member 40 in the axial direction Dx1. For example, when liquid flows from the first part P1 to the second part P2 through the impulse pipe 60, the second part P2 can be filled with the liquid by discharging the gas in the second part P2 to the outside from the discharge port 50. .

The discharge port 50 is preferably provided on the outer circumferential surface 11 on the opposite side to the installation surface such as the ground (above the installation surface). By providing the discharge port 50 above the installation surface, gas can be efficiently discharged to the outside from the discharge port 50. The discharge port 50 is provided with, for example, a plug 51 for closing. The plug 51 may be a valve, check valve, or the like.

Each part of the pressure reducing valve 100 is made of a metal material such as stainless steel or aluminum alloy. The pressure reducing valve 100 may include a member made of a non-metallic material such as resin. The inner diameter ID1 of the first tubular body 10 is, for example, 40 mm to 150 mm. The inner diameters ID21 and ID22 of the second tube bodies 21 and 22 are, for example, 40 mm to 150 mm.

The movement of the valve body 30 in the pressure reducing valve 100 will be explained. The fluid supplied to the pressure reducing valve 100 flows from the first portion P1 to the second flow path 121 of the second pipe body 21 and the second flow path 122 of the second pipe body 22. Fluid flows into the second portion P2 from the first portion P1 through the pressure guiding pipe 60. When fluid is supplied to the pressure reducing valve 100, the first portion P1, the second portion P2, the second flow paths 121, 122, and the pressure guiding pipe 60 are filled with the fluid.

In a state where fluid is flowing through the pressure reducing valve 100, dynamic pressure and static pressure of the fluid flowing through the first portion P1 act on the pressure receiving surface 31 of the valve body 30 from the end portion 10a side in the axial direction Dx1, and the end portion From the 10b side, the static pressure of the fluid in the second portion P2 and the biasing force of the biasing member 70 act on the pressure receiving surface 32 of the valve body 30. Static pressure is the pressure that the fluid in the piping has.

Since the fluid in the first portion P1 flows into the second portion P2 through the impulse pipe 60, the static pressure of the fluid in the second portion P2 is approximately equal to the static pressure of the fluid in the first portion P1. The areas of the pressure receiving surface 31 and the pressure receiving surface 32 are equal, and the static pressure of the fluid in the first portion P1 and the second portion P2 acts from both directions in the axial direction Dx1. The static pressure of the fluid hardly affects the movement of the valve body 30 in the axial direction Dx1. From another point of view, the static pressure of the fluid in the first portion P1 and the second portion P2 is canceled by the pressure guiding pipe 60.

In this case, the valve body 30 moves from the end 10a side in the axial direction Dx1 to the end 10b side mainly due to the dynamic pressure of the fluid flowing through the first portion P1, and the end in the axial direction Dx1 due to the biasing force of the biasing member 70. It moves from the part 10b side to the end part 10a side. For example, when the flow rate of fluid flowing into the pressure reducing valve 100 increases and the dynamic pressure of the fluid in the first portion P1 increases, the valve body 30 resists the biasing force of the biasing member 70 and moves toward the end 10a side in the axial direction Dx1. It moves from there to the end portion 10b side.

Since the pressure guiding pipe 60 moves in the axial direction Dx1 together with the valve body 30, even if the valve body 30 moves, the positional relationship between the pressure receiving surface 31 and the opening 6a in the axial direction Dx1 does not change. Regardless of the position of the valve body 30, fluid flows into the second portion P2 from the opening 6a located at a distance L6 from the pressure receiving surface 31.

Therefore, the static pressure of the second portion P2 tends to be equal to the static pressure acting on the pressure receiving surface 31. From another point of view, the static pressure of the fluid in the second portion P2 is unlikely to differ from the static pressure acting on the pressure receiving surface 31. By moving the pressure guiding pipe 60 together with the valve body 30, the influence of static pressure on the valve body 30 is further suppressed.

As shown in FIGS. 2 and 3, the first axis AX1 of the first tubular body 10 and the second axes AX21, AX22 of the second tubular bodies 21, 22 intersect, so the valve body provided in the first tubular body 10 30 is not easily affected by the fluid flowing through the second flow paths 121 and 122.

Before the valve body 30 moves in the axial direction Dx1, the openings 13 and 14 have portions O1 and O2 that are not blocked by the valve body 30. Therefore, the pressure reducing valve 100 has parts from the first portion P1 to the second pipe body 21, A fluid flow occurs to 22. In this state, the dynamic pressure of the fluid in the first portion P1 is acting on the pressure receiving surface 31.

When the flow rate of the fluid flowing through the first portion P1 is small, the dynamic pressure acting on the pressure receiving surface 31 is small. When the dynamic pressure acting on the pressure receiving surface 31 is smaller than the urging force of the urging member 70 acting on the pressure receiving surface 32, the valve body 30 does not move from the state shown in FIG.

In the pressure reducing valve 100, when fluid flows from the first portion P1 to the second flow paths 121, 122, the flow paths are contracted in unblocked portions O1, O2. The pressure of the fluid is reduced due to pressure loss such as resistance when passing from the first portion P1 to the uncovered portions O1 and O2. The pressure of the fluid in the second flow path 121, 122 is lower than the pressure of the fluid flowing in the first portion P1, and there is a pressure difference (differential pressure) between the fluid in the first portion P1 and the fluid in the second flow path 121, 122. occurs.

FIG. 4 is a schematic diagram showing the position of the valve body 30 in the pressure reducing valve 100 according to the first embodiment. In FIG. 4, the valve body 30 has moved toward the end portion 10b from the position shown in FIG. 2 due to an increase in the dynamic pressure acting on the pressure receiving surface 31.

For example, when the flow rate of the fluid in the first portion P1 increases, the dynamic pressure acting on the pressure receiving surface 31 increases, and the valve body 30 resists the biasing force of the biasing member 70 and moves from the end 10a side in the axial direction Dx1. It moves to the end portion 10b side. As the valve body 30 moves toward the end portion 10b, the unoccluded portions O1 and O2 expand, and the obstructed portions NO1 and NO2 contract.

When the unobstructed portions O1 and O2 expand, the pressure loss when the fluid passes through the unobstructed portions O1 and O2 from the first portion P1 becomes smaller. When the flow rate of the fluid in the first portion P1 increases and the unblocked portions O1 and O2 expand, the pressure reducing effect when the fluid passes through the pressure reducing valve 100 becomes lower.

When the flow rate of the fluid in the first portion P1 further increases, the dynamic pressure acting on the pressure receiving surface 31 increases, and the valve body 30 resists the biasing force of the biasing member 70 from the end 10a side in the axial direction Dx1. Move to the section 10b side. As the unobstructed portions O1 and O2 further expand, the pressure loss when the fluid passes from the first portion P1 through the unobstructed portions O1 and O2 becomes smaller, and when the fluid passes through the pressure reducing valve 100, the pressure loss decreases. The depressurizing effect will even be reduced.

At the position of the valve body 30 in the example shown in FIG. 4, the total area of the unblocked portions O1 and O2 is approximately equal to the flow path area of the first pipe body 10. When the valve body 30 moves to this position, there is almost no pressure loss when the fluid flows from the first portion P1 into the second pipe bodies 21 and 22 through the unblocked portions O1 and O2, and the second flow path 121 , 122 is approximately equal to the pressure of the fluid flowing through the first portion P1.

Therefore, the pressure difference between the fluid in the first portion P1 and the fluid in the second flow paths 121 and 122 is less likely to occur. In this case, the pressure reducing valve 100 has almost no pressure reducing effect. From another point of view, the difference in flow velocity between the fluid in the first portion P1 and the fluid in the second portion P2 is less likely to occur.

When the flow rate of the fluid in the first portion P1 decreases, the dynamic pressure acting on the pressure receiving surface 31 decreases, and the valve body 30 is moved toward the end 10b side in the axial direction Dx1 by the urging force of the urging member 70 acting on the pressure receiving surface 32. It moves from there to the end portion 10a side. As the valve body 30 moves toward the end portion 10a, the unclosed portions O1 and O2 contract, and the closed portions NO1 and NO2 expand.

The pressure reducing valve 100 does not have any part where the flow path changes other than the openings 13 and 14. Therefore, if the flow rate of fluid flowing into the pressure reducing valve 100 increases, the flow rate of fluid flowing out from the ends 21a, 22a increases, and if the flow rate of fluid flowing into the pressure reducing valve 100 decreases, the flow rate of fluid flowing out from the ends 21a, 22a increases. The flow rate of fluid exiting the is reduced.

As shown in FIG. 4, the main body 1 may further include a stopper G that restricts movement of the valve body 30. The stopper G includes a portion that protrudes from the inner circumferential surface 12 of the first tube body 10 toward the first axis AX1. The protruding portion is located between the pressure receiving surface 32 of the valve body 30 and the end surface 41 of the adjustment member 40.

When the pressure receiving surface 32 of the valve body 30 comes into contact with the protruding portion of the stopper G, movement of the valve body 30 from the end portion 10a side to the end portion 10b side in the axial direction Dx1 is restricted. The stopper G is, for example, provided on the first tube body 10 in a detachable manner. Two or more stoppers G may be provided in the circumferential direction θ.

The moving distance of the valve body 30 in the axial direction Dx1 is appropriately set according to the flow rate of the fluid supplied to the pressure reducing valve 100, the inner diameter ID1 of the first pipe body 10, the inner diameters ID21, ID22 of the second pipe bodies 21, 22, etc. can do. The moving distance of the valve body 30 may be longer or shorter than the example shown in FIG. 4 .

For example, when the pressure receiving surface 31 moves in the radial direction Dr1 until it coincides with the second axes AX21, AX22, the total area of the portions O1, O2 of the openings 13, 14 that are not blocked by the valve body 30 is calculated as the first It may be approximately equal to the flow path area of the tube body 10. In this case, since the pressure receiving surface 31 is located at the center of the openings 13, 14, the sizes of the unclosed portions O1, O2 and the closed portions NO1, NO2 are approximately equal. As another example, the valve body 30 may be moved until the pressure receiving surface 31 coincides with the portions 13a, 14a of the openings 13, 14 closest to the end portion 10b side.

According to the first embodiment described above, it is possible to provide the pressure reducing valve 100 that exhibits a pressure reducing effect according to the flow rate in the pipe. That is, the pressure reducing valve 100 can exhibit a pressure reducing effect that is high when the flow rate is low and becomes low when the flow rate increases.

Before the valve body 30 moves in the axial direction Dx1, the openings 13 and 14 have portions O1 and O2 that are not blocked by the valve body 30, so the pressure reducing valve 100 has parts from the first portion P1 to the second pipe body 21, A fluid flow occurs to 22. For example, when the pressure of the primary fluid supplied to the pressure reducing valve 100 is constant and the flow rate varies, the dynamic pressure of the fluid in the first portion P1 is applied to the pressure receiving surface 31 before the valve body 30 moves. be able to. When the flow rate of the fluid in the first portion P1 increases, the dynamic pressure of the fluid in the first portion P1 increases, and the valve body 30 is moved from the end 10a side in the axial direction Dx1 against the biasing force of the biasing member 70. It moves to the end portion 10b side.

When the valve body 30 moves toward the end portion 10b and the uncovered portions O1 and O2 expand, the pressure loss when the fluid passes from the first portion P1 through the uncovered portions O1 and O2 is small. Therefore, the pressure reducing effect when the fluid passes through the pressure reducing valve 100 becomes low.

By providing the two second tubes 21 and 22 as shown in the first embodiment, the total area of the openings 13 and 14 formed in the first tube 10 is made larger than the flow path area of the first tube 10. can. Even if the moving distance of the valve body 30 is short when the flow rate of the fluid flowing through the pressure reducing valve 100 increases, the total area of the portions O1 and O2 that are not blocked by the valve body 30 is defined as the flow path area of the first pipe body 10. It can be roughly equal to Therefore, the pressure reducing effect of the pressure reducing valve 100 can be reduced when the moving distance of the valve body 30 is short.

By rotating the protruding portion 62 of the pressure guiding tube 60, the position of the opening 6a in the circumferential direction θ can be adjusted, and the distance L6 of the opening 6a from the pressure receiving surface 31 can be adjusted. By adjusting the pressure guiding pipe 60 according to the flow rate of the fluid supplied to the pressure reducing valve 100, etc., the static pressure of the fluid in the second portion P2 can be adjusted.

Since the biasing force of the biasing member 70 is set relative to the dynamic pressure of the fluid in the first portion P1, the biasing force can be made smaller compared to the case where the pressure guiding pipe 60 is not provided. Since the movement of the valve body 30 toward the end portion 10b is mainly caused by the dynamic pressure of the fluid flowing through the first portion P1, adjusting the biasing force of the biasing member 70 moves the valve body 30 toward the first portion P1. A large pressure difference can be generated between the fluids flowing through the second flow paths 121 and 122.

By adjusting the urging force of the urging member 70 with respect to the dynamic pressure of the fluid flowing through the first portion P1, movement of the valve body 30 in the axial direction Dx1 can be easily controlled. The pressure reducing valve 100 can exhibit a pressure reducing effect suitable for the site of use without major structural changes such as replacing the main body 1. Since the pressure reducing valve 100 has a control mechanism that does not use electrical control, it has a simple structure and is easy to use. In addition to what has been explained above, various other advantageous effects can be obtained from this embodiment.

The configuration of the pressure reducing valve 100 according to the first embodiment is only an example. Although the first tubular body 10 and the second tubular bodies 21 and 22 have a cylindrical shape, various shapes can be applied to the first tubular body 10 and the second tubular bodies 21 and 22. Various shapes can be applied to the valve body 30 depending on the shape of the first pipe body 10.

In the pressure reducing valve 100, the inner diameter ID1 of the first pipe body 10 may be smaller than the inner diameter ID21, ID22 of the second pipe bodies 21, 22, or the inner diameter ID1 of the first pipe body 10 may be smaller than the inner diameter ID1 of the second pipe bodies 21, 22. It may be equal to the inner diameters ID21 and ID22. The first tubular body 10 and the second tubular bodies 21 and 22 extend with uniform diameters along the first axis AX1 and the second axes AX21 and AX22, but may have portions with different diameters. The inner diameters ID21 and ID22 of the second tube bodies 21 and 22 may be different from each other. For example, the inner diameter ID21 of the second tube 21 may be larger or smaller than the inner diameter ID22 of the second tube 22.

The second axis AX21 of the second tube 21 and the second axis AX22 of the second tube 22 may be positioned offset in the axial direction Dx1. In this case, the opening 13 is shifted from the opening 14 in the axial direction Dx1. For example, the opening 13 may be located closer to the end 10a than the opening 14, or the opening 14 may be located closer to the end 10a than the opening 13 is.

Although the first tube body 10 was provided with two openings 13 and 14, the number of openings may be one, or three or more. In the case where there is one opening, the area of the opening may be larger than the flow path area of the first tube body 10. In the case where there are three or more openings, the total area of the three or more openings may be larger than the flow path area of the first tube body 10. The number of second pipe bodies is changed as appropriate depending on the number of openings.

In the pressure guiding tube 60, by replacing the protruding part 62, at least one of the distance L6 from the pressure receiving surface 31, the direction of the opening 6a in the circumferential direction θ, the inner diameter ID60 of the opening 6a, and the inner diameter of the protruding part 62 can be changed. good. The pressure guiding pipe 60 may not have the straight pipe portion 61 and may be connected to the valve body 30 so that the flow path of the protruding portion 62 communicates with the connecting path 34. Although the discharge port 50 was provided in the first tubular body 10, the discharge port 50 may be provided in the adjustment member 40 along the first axis AX1.

[Second embodiment]
A second embodiment will be described. Components similar to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 5 is a schematic partial sectional view of the pressure reducing valve 200 according to the second embodiment. FIG. 5 shows a cross section of the pressure reducing valve 200 along the first axis AX1, which is perpendicular to a plane defined by the first axis AX1 and the second axes AX21, AX22, as viewed from the second pipe body 22 side. FIG. 5 shows, as an example, before the valve body 30 moves (before fluid is supplied to the pressure reducing valve 200).

As shown in FIG. 5, the pressure reducing valve 200 includes a main body 1, a valve body 30, an adjusting member 40, a discharge port 50, and a biasing member 70. The main body 1 has a first tube 10 and second tubes 21 and 22 connected to two openings 13 and 14 provided in the first tube 10. However, the opening 14 and the second tube 22 are not shown in FIG. 5. The second axis AX21 of the second tube 21 is located on the same straight line as the second axis AX22 of the second tube 22, for example. A connector 10A is provided at the end 10a of the first tube body 10.

The inner diameter ID1 of the first tube 10 is larger than the inner diameter ID21 of the second tube 21, for example. The inner diameter ID1 of the first tube 10 may be equal to or smaller than the inner diameter ID21 of the second tube 21. The inner diameter ID22 of the second tubular body 22 (not shown) is also the same as the inner diameter ID21 of the second tubular body 21.

The main body 1 further includes a pressure guiding pipe 80 connecting the first part P1 and the second part P2. The pressure reducing valve 200 differs from the first embodiment in that the pressure guiding pipe 80 is provided outside the first pipe body 10 and that the valve body 30 does not have the connection path 34.

The first tube body 10 has an opening 8a located between the end 10a and the openings 13 and 14, and an opening 8b located between the openings 13 and 14 and the end 10b in the axial direction Dx1. ing. The pressure guiding pipe 80 has a pipe 81 connected to the opening 8a, a pipe 82 connected to the opening 8b, and a pipe 83 connecting the pipe 81 and the pipe 82. The tubes 81 and 82 protrude in a direction away from the first axis AX1. The tube 83 extends along the first axis AX1. The impulse pipe 80 is formed of, for example, a steel pipe made of the same material as the main body 1.

The openings 8a and 8b are formed at positions that are not blocked by the outer circumferential surface 33 of the valve body 30 when the valve body 30 moves. The openings 8a and 8b have, for example, a circular shape when viewed from the outer circumferential surface 11 side of the first tubular body 10. Openings 8a and 8b are smaller than openings 13 and 14. The inner diameter ID8a of the opening 8a is, for example, 1/5 to 1/10 of the inner diameter ID1 of the first tube body 10.

The fluid flowing through the first portion P1 passes through the impulse pipe 80 from the opening 8a and flows into the second portion P2 from the opening 8b in the axial direction Dx1. The discharge port 50 is provided at a position away from the opening 8b. For example, the discharge port 50 is located on the opposite side of the opening 8b with respect to the first axis AX1. By providing the discharge port 50 at a position away from the opening 8b, the gas in the second portion P2 can be efficiently discharged to the outside when liquid flows into the second portion P2.

Like the first embodiment, the valve body 30 is provided in the first flow path 110 so as to be movable in the axial direction Dx1. The movement of the valve body 30 in the pressure reducing valve 200 is similar to that in the first embodiment. Even with the structure of the pressure reducing valve 200 according to the second embodiment, it is possible to obtain the pressure reducing valve 200 having an excellent pressure reducing effect as in the first embodiment. Further, the same effects as in the first embodiment can be obtained.

[Third embodiment]
A third embodiment will be described. Components similar to those in each of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 6 is a schematic partial sectional view of a pressure reducing valve 300 according to a third embodiment. FIG. 7 is a schematic front view of the valve body 30 shown in FIG. 6. FIG. 7 shows the valve body 30 viewed from the pressure receiving surface 31 side. FIG. 6 shows, as an example, before the valve body 30 moves (before fluid is supplied to the pressure reducing valve 300).

As shown in FIG. 6, the pressure reducing valve 300 includes a main body 1, a valve body 30, an adjusting member 40, a discharge port 50, and a biasing member 70. The main body 1 has a first tube 10 and second tubes 21 and 22 connected to two openings 13 and 14 provided in the first tube 10. The second axis AX21 of the second tube 21 is located on the same straight line as the second axis AX22 of the second tube 22, for example.

A connector 10A is provided at the end 10a of the first tube body 10. Connectors 21A and 22A are provided at the ends 21a and 22a of the second tube bodies 21 and 22, respectively. The inner diameter ID1 of the first tube 10 is larger than the inner diameters ID21 and ID22 of the second tubes 21 and 22, for example.

The valve body 30 has a pressure receiving surface 31 , a pressure receiving surface 32 , an outer circumferential surface 33 , a connecting path 34 , a skirt portion 38 , and a stopper 39 . The valve body 30 is integrally formed to include, for example, a skirt portion 38 and a stopper 39. The outer peripheral surface 33 is connected to the pressure receiving surface 31 and extends along the first axis AX1.

The connection path 34 is provided in the center of the valve body 30 along the first axis AX1. The connection path 34 connects the first portion P1 and the second portion P2. The connection path 34 has a connection port 35 on the side of the pressure receiving surface 31 and an enlarged diameter portion 37 communicating with the connection port 35 . The inner diameter ID37 of the enlarged diameter portion 37 is larger than the inner diameter ID35 of the connection port 35. The enlarged diameter portion 37 is formed with a uniform diameter along the first axis AX1.

The pressure receiving surface 32 includes a surface 321, a surface 322, and a surface 323. The surface 321, the surface 322, and the surface 323 are located closer to the end portion 10b than the pressure receiving surface 31 in the axial direction Dx1. The surface 321 is a surface connected to the connection port 35 in the enlarged diameter portion 37 . The surface 322 is a biasing surface that is biased by the biasing member 70, and is in contact with the contact portion 71 of the biasing member 70. The surface 323 is an end surface of the valve body 30 on the end 10b side. The surface 321, the surface 322, and the surface 323 are parallel to the radial direction Dr1, for example.

The second portion P2 includes a portion located closer to the end portion 10b than the pressure receiving surface 31 in the axial direction Dx1. The second portion P2 includes, for example, the expanded diameter portion 37, a portion surrounded by the skirt portion 38, and a portion between the surface 323 and the end surface 41 of the adjustment member 40. In the second portion P2, the static pressure of the fluid acts on the pressure receiving surface 32 from the end 10b side, and the urging force of the urging member 70 acts on the surface 322 from the end 10b side.

By forming the enlarged diameter portion 37 in the connection path 34, the fluid in the connection path 34 is difficult to move when the valve body 30 moves, and pressure loss that occurs when the fluid moves can be suppressed. Therefore, the static pressure of the second portion P2 tends to be equal to the static pressure acting on the pressure receiving surface 31. From another point of view, the static pressure of the fluid in the second portion P2 is unlikely to differ from the static pressure acting on the pressure receiving surface 31.

A protrusion 62 of a pressure guiding pipe 60 is connected to the connection port 35 from the pressure receiving surface 31 side. The flow path of the protrusion 62 communicates with the connection path 34 . The inner diameter ID37 of the enlarged diameter portion 37 is larger than the inner diameter of the protrusion 62. The second portion P2 is connected to the first portion P1 by a protrusion 62. As described using FIG. 2, the protruding portion 62 is provided rotatably in the circumferential direction θ by, for example, the connecting portions 36, 64, etc.

The impulse tube 60 has a cover 65. The cover 65 surrounds the outer peripheral surface of the protrusion 62 including the opening 6a. From another point of view, the opening 6a faces the inner peripheral surface of the cover 65. The cover 65 has, for example, a cylindrical shape centered on the first axis AX1. The cover 65 is provided with a gap between it and the opening 6a in the radial direction Dr1. A flow path 650 along the first axis AX1 is formed between the outer peripheral surface of the protrusion 62 and the cover 65.

A gap is formed between the pressure receiving surface 31 and the cover 65 in the axial direction Dx1. In the example shown in FIG. 6, the end surface of the cover 65 on the end 10a side is aligned with the surface 631 in the axial direction Dx1, but may be shifted in the axial direction Dx1. The cover 65 is made of the same material as the impulse tube 60, for example.

The cover 65 is detachably fixed to the outer circumferential surface of the protrusion 62 by, for example, a fixing member 66. When the protrusion 62 is rotatably provided, the cover 65 rotates together with the protrusion 62 . The fixing member 66 is located closer to the pressure receiving surface 31 than the opening 6a in the axial direction Dx1. The fixing member 66 includes, for example, a bolt 66a and a nut 66b fastened to the bolt 66a.

In the example shown in FIG. 7, three fixing members 66 are arranged evenly in the circumferential direction θ. The number of fixing members 66 is not limited to three, and may be two or four or more. The cover 65 may be fixed to the protrusion 62 by a method other than the fixing method using the fixing member 66.

A part of the fluid flowing through the first portion P1 flows through the flow path 650 from the end 10a side to the end 10b side in the axial direction Dx1. The fluid flow direction is unidirectional. The fluid flow in the flow path 650 is rectified and difficult to be disturbed. The fluid in the flow path 650 passes through the gap between the pressure receiving surface 31 and the cover 65 and flows into the second flow path 121 or the second flow path 122 along the pressure receiving surface 31.

Since the opening 6a is provided on the outer peripheral surface of the protrusion 62, the fluid flowing through the flow path 650 is difficult to flow toward the opening 6a. Therefore, the fluid in the impulse pipe 60 is not easily affected by the dynamic pressure of the fluid flowing through the flow path 650. By replacing the cover 65, the length of the cover 65 in the axial direction Dx1 and the size of the flow path 650 in the axial direction Dx1 and the radial direction Dr1 can be adjusted.

The valve body 30 has, for example, a skirt portion 38 formed in a cylindrical shape centered on the first axis AX1. The skirt portion 38 protrudes beyond the surface 322 toward the end portion 10b in the axial direction Dx1. In the example shown in FIG. 6, the outer circumferential surface of the skirt portion 38 is formed to have the same diameter as the outer circumferential surface 33. The inner diameter ID38 of the skirt portion 38 is formed to have a uniform diameter along the first axis AX1.

The inner diameter ID38 of the skirt portion 38 is larger than the inner diameter ID37 of the enlarged diameter portion 37. The inner diameter ID38 of the skirt portion 38 is larger than the outer diameter of the biasing member 70. In the example shown in FIG. 6, the length of the expanded diameter portion 37 in the axial direction Dx1 is longer than the length of the skirt portion 38 in the axial direction Dx1.

The skirt portion 38 surrounds at least a portion of the biasing member 70, as shown in FIG. By appropriately changing the length of the skirt portion 38 in the axial direction Dx1, the length of the portion where the biasing member 70 is surrounded by the skirt portion 38 can be changed.

Providing the skirt portion 38 makes it difficult for the contact portion 71 of the biasing member 70 to shift in the radial direction Dr1 with respect to the surface 322. Therefore, the biasing member 70 can stably bias the surface 322 from the end 10b side to the end 10a side in the axial direction Dx1.

Even when the length of the first pipe body 10 or the biasing member 70 in the axial direction Dx1 cannot be changed, by providing the skirt portion 38, the length of the valve body 30 in the axial direction Dx1 can be increased. The length of the valve body 30 in the axial direction Dx1 in the third embodiment is longer than, for example, the length in the axial direction Dx1 of the valve body 30 in the first embodiment and the second embodiment.

By increasing the length of the valve body 30 in the axial direction Dx1, the valve body 30 becomes less likely to tilt with respect to the first axis AX1 when moving. By suppressing the inclination of the valve body 30 with respect to the first axis AX1, the outer circumferential surface 33 is less likely to be caught in the openings 13 and 14, for example, when the valve body 30 moves. Therefore, the valve body 30 becomes easier to move in the axial direction Dx1. Furthermore, when the outer diameter of the valve body 30 is larger than the inner diameters ID21, ID22 of the second pipe bodies 21, 22, the outer peripheral surface 33 of the valve body 30 is less likely to be caught in the openings 13, 14.

By making the length of the skirt portion 38 in the axial direction Dx1 longer than the length when the biasing member 70 is most compressed, the length when the biasing member 70 is compressed can be adjusted. For example, the length of the skirt portion 38 in the axial direction Dx1 may be approximately equal to the length when the biasing member 70 is most compressed.

In the example shown in FIG. 6, the discharge port 50 is provided in the center of the adjustment member 40 along the first axis AX1. By providing the discharge port 50 in the adjustment member 40, the discharge port 50 is not blocked by the outer peripheral surface 33 of the valve body 30. The discharge port 50 is provided with a plug 51 that closes the discharge port 50, for example.

The valve body 30 has a stopper 39 that protrudes from the outer peripheral surface 33 in the radial direction Dr1. The stopper 39 is provided at the end of the skirt portion 38 in the axial direction Dx1. At least a portion of the stopper 39 protrudes from the outer peripheral surface 33 in the radial direction Dr1. In the example shown in FIG. 7, the stopper 39 is formed in an annular shape.

A locking surface 15 for locking the stopper 39 is formed on the first tube body 10 . The locking surface 15 faces the stopper 39 in the axial direction Dx1. The locking surface 15 is parallel to the radial direction Dr1, for example. In the first tube body 10, an enlarged diameter portion 16 having an inner diameter larger than the inner diameter ID1 is formed between the openings 13, 14 and the end portion 10b. The inner diameter of the enlarged diameter portion 16 is larger than the outer diameter of the stopper 39.

By locking the stopper 39 with the locking surface 15, movement of the valve body 30 from the end portion 10b side to the end portion 10a side in the axial direction Dx1 is restricted. The stopper 39 is movable between the locking surface 15 and the end portion 10b in the axial direction Dx1.

Since the movement of the valve body 30 in the axial direction Dx1 is restricted by the stopper 39, the biasing member 70 is compressed by, for example, moving the adjustment member 40 from the end 10b side to the end 10a side in the axial direction Dx1. be able to. By compressing the biasing member 70, the biasing force of the biasing member 70 acting on the surface 322 can be increased. From another perspective, the biasing force of the biasing member 70 can be adjusted by the adjustment member 40.

The position where the stopper 39 is formed may be any other position in the axial direction Dx1. Various shapes other than the shapes shown in FIGS. 6 and 7 can be applied to the stopper 39. The stopper 39 may be formed on a part of the outer peripheral surface 33 in the circumferential direction θ, for example.

Furthermore, a spacer SP may be provided between the locking surface 15 and the stopper 39. FIG. 8 is a schematic partial sectional view showing a pressure reducing valve 300 including a spacer SP. The pressure reducing valve 300 further includes a spacer SP between the locking surface 15 and the stopper 39 in the axial direction Dx1. The spacer SP has a locking surface SP1 facing the stopper 39.

The spacer SP is formed in an annular shape from, for example, a metal material, a resin material, or the like. The inner diameter of the spacer SP is approximately equal to the inner diameter ID1 of the first tubular body 10. The position of the adjustment member 40 in FIG. 8 is the same as that shown in FIG. 6.

The movement of the valve body 30 in the axial direction Dx1 is regulated by the stopper 39 being locked to the locking surface SP1 of the spacer SP. Compared to the case shown in FIG. 6, by providing the spacer SP, the valve body 30 is located on the end portion 10b side. That is, before fluid is supplied to the pressure reducing valve 300, the unblocked portions O1, O2 of the openings 13, 14 expand, and the blocked portions NO1, NO2 of the openings 13, 14 contract. By providing the spacer SP, the opening degrees of the openings 13 and 14 can be adjusted.

Since the valve body 30 is located on the end portion 10b side, the biasing member 70 is compressed by an amount corresponding to the length of the spacer SP in the axial direction Dx1, so that the biasing force of the biasing member 70 acting on the surface 322 is reduced. becomes larger. The opening degrees of the openings 13 and 14 and the biasing force of the biasing member 70 may be adjusted by adjusting the length of the spacer SP in the axial direction Dx1 or by providing a plurality of spacers SP.

The valve body 30 is provided in the first flow path 110 in a movable state in the axial direction Dx1, as in each of the above-described embodiments. The movement of the valve body 30 in the pressure reducing valve 300 is the same as in each of the embodiments described above. Even with the structure of the pressure reducing valve 300 according to the third embodiment, it is possible to obtain a pressure reducing valve 300 having an excellent pressure reducing effect as in each of the above-described embodiments. Further, the same effects as those of the above-described embodiments can be obtained.

In the third embodiment, by forming the enlarged diameter portion 37 in the connection path 34 of the valve body 30, when the valve body 30 moves, the fluid in the connection path 34 is suppressed from moving together with the valve body 30. can. Furthermore, in the flow path 650 formed by the cover 65, the fluid flow is formed in the direction along the first axis AX1, so the fluid in the impulse tube 60 is influenced by the dynamic pressure of the fluid flowing through the first portion P1. It becomes difficult.

Further, since the valve body 30 has the skirt portion 38, the inclination and wobbling of the valve body 30 with respect to the first axis AX1 are suppressed, and the valve body 30 becomes easier to move in the first flow path 110. Further, since the valve body 30 has a stopper 39, movement of the valve body 30 in the axial direction Dx1 of the valve body 30 is restricted, and the opening degree of the openings 13 and 14 is adjusted and the biasing force of the biasing member 70 is adjusted by the adjustment member 40. can be adjusted.

The configuration of the pressure reducing valve 300 according to the third embodiment is only an example. The length of the skirt portion 38 in the axial direction Dx1 may be longer than the length of the enlarged diameter portion 37 in the axial direction Dx1. By increasing the length of the skirt portion 38 in the axial direction Dx1, the length of the biasing member 70 in the axial direction Dx1 can be increased.

For example, the inner diameter ID37 of the enlarged diameter portion 37 may be made equal to the inner diameter ID38 of the skirt portion 38, and the surface 322 may be provided at a position that coincides with the surface 321 in the axial direction Dx1. By increasing the length of the enlarged diameter portion 37 in the axial direction Dx1, for example, when the biasing member 70 is a coil spring, a coil spring with a longer free length can be provided. The shapes of the skirt portion 38 and stopper 39 of the valve body 30 in the third embodiment can also be applied to each of the above-described embodiments.

[Fourth embodiment]
A fourth embodiment will be described. Components similar to those in each of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 9 is a schematic partial sectional view of a pressure reducing valve 400 according to a fourth embodiment. FIG. 10 is a schematic front view of the valve body 30 shown in FIG. 9. FIG. 10 shows the valve body 30 viewed from the pressure receiving surface 31 side. FIG. 9 shows, as an example, before the valve body 30 moves (before fluid is supplied to the pressure reducing valve 400).

As shown in FIG. 9, the pressure reducing valve 400 includes a main body 1, a valve body 30, an adjusting member 40, a discharge port 50, and a biasing member 70. The main body 1 has a first tube 10 and second tubes 21 and 22 connected to two openings 13 and 14 provided in the first tube 10. The second axis AX21 of the second tube 21 is located on the same straight line as the second axis AX22 of the second tube 22, for example.

A connector 10A is provided at the end 10a of the first tube body 10. Connectors 21A and 22A are provided at the ends 21a and 22a of the second tube bodies 21 and 22, respectively. The inner diameter ID1 of the first tube 10 is larger than the inner diameters ID21 and ID22 of the second tubes 21 and 22, for example.

The valve body 30 has a pressure receiving surface 31 , a pressure receiving surface 32 , an outer circumferential surface 33 , a connecting path 34 , a skirt portion 38 , and a stopper 39 . The valve body 30 is integrally formed to include, for example, a skirt portion 38 and a stopper 39. The outer peripheral surface 33 is connected to the pressure receiving surface 31 and extends along the first axis AX1. The pressure receiving surface 32 includes a surface 321, a surface 322, and a surface 323.

The connection path 34 is provided in the center of the valve body 30 along the first axis AX1. The connection path 34 connects the first portion P1 and the second portion P2. The connection path 34 has a connection port 35 on the side of the pressure receiving surface 31 and an enlarged diameter portion 37 communicating with the connection port 35 . The inner diameter ID37 of the enlarged diameter portion 37 is larger than the inner diameter ID35 of the connection port 35.

The valve body 30 further includes a shielding member BP1. The fourth embodiment differs from the third embodiment in that it includes a shielding member BP1. The shielding member BP1 is provided with a gap between it and the pressure receiving surface 31. A flow path BPa is formed between the pressure receiving surface 31 and the shielding member BP1. In the example shown in FIG. 10, the shielding member BP1 is, for example, a circular flat plate when viewed from the front. The diameter BPD of the shielding member BP1 is larger than the inner diameter ID35 of the connection port 35. The shielding member BP1 is made of the same material as the cover 65, for example.

The shielding member BP1 is connected to the pressure receiving surface 31 by a pin PN. The pin PN is, for example, a rod-shaped member that protrudes from the pressure receiving surface 31. In the example shown in FIG. 10, three pins PN are equally arranged around the first axis AX1. The number of pins PN is not limited to three, and may be one or four or more. The shielding member BP1 may be fixed to the valve body 30 by a method other than the fixing method using the pin PN.

A surface BP10 of the shielding member BP1 on the end 10a side intersects the first axis AX1. In the example shown in FIG. 9, the plane BP10 is perpendicular to the first axis AX1 and substantially parallel to the pressure receiving surface 31. The shielding member BP1 is located between the end portion 10a and the pressure receiving surface 31 in the axial direction Dx1, and overlaps with the connection port 35. From another point of view, as shown in FIG. 10, the shielding member BP1 covers the connection port 35 from the end 10a side.

The shielding member BP1 suppresses the fluid flowing through the first portion P1 from flowing into the connection port 35 along the axial direction Dx1. In the pressure reducing valve 400, dynamic pressure and static pressure of the fluid flowing through the first portion P1 act on the pressure receiving surface 31 of the valve body 30 and the shielding member BP1 from the end portion 10a side in the axial direction Dx1.

A part of the fluid flowing through the first portion P1 flows through the flow path BPa along the pressure receiving surface 31. The fluid in the flow path BPa flows into the second flow path 121 or 122 along the pressure receiving surface 31. The flow direction of the fluid in the flow path BPa is a direction perpendicular to the first axis AX1.

Since the flow direction of the fluid in the flow path BPa is a direction that intersects the first axis AX1, the fluid flowing in the flow path BPa is difficult to flow toward the connection port 35. Therefore, the fluid in the second portion P2 is not easily affected by the dynamic pressure of the fluid flowing in the first portion P1. By replacing the shielding member BP1, the size of the surface BP10 can be adjusted, and by changing the length of the pin PN, the size of the flow path BPa can be adjusted.

The valve body 30 is provided in the first flow path 110 in a movable state in the axial direction Dx1, as in each of the above-described embodiments. The movement of the valve body 30 in the pressure reducing valve 400 is the same as in each of the above-described embodiments. Even with the structure of the pressure reducing valve 400 according to the fourth embodiment, it is possible to obtain the pressure reducing valve 400 having an excellent pressure reducing effect as in each of the above-described embodiments. Further, the same effects as those of the above-described embodiments can be obtained.

In the fourth embodiment, by providing the shielding member BP1, it is possible to suppress the influence of the dynamic pressure of the fluid flowing through the first portion P1 on the second portion P2. Note that the spacer SP described in the third embodiment can also be provided in the fourth embodiment.

[Fifth embodiment]
A fifth embodiment will be described. Components similar to those in each of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted as appropriate.

11 and 12 are schematic partial sectional views of a pressure reducing valve 500 according to a fifth embodiment. FIG. 11 shows the state before the valve body 30 moves (before fluid is supplied to the pressure reducing valve 500), and FIG. 12 shows the state where the valve body 30 has moved the most toward the end portion 10b (unclosed portion O1, O2 is in the most expanded state). In FIG. 12, as an example, the sizes of the unclosed portions O1 and O2 are equal to the openings 13 and 14, and the closed portions NO1 and NO2 are not formed.

As shown in FIGS. 11 and 12, the pressure reducing valve 500 includes a main body 1, a valve body 30, an adjusting member 40, a discharge port 50, and a biasing member 70. The main body 1 has a first tube 10 and second tubes 21 and 22 connected to two openings 13 and 14 provided in the first tube 10. The second axis AX21 of the second tube 21 is located on the same straight line as the second axis AX22 of the second tube 22, for example.

A connector 10A is provided at the end 10a of the first tube body 10. Connectors 21A and 22A are provided at the ends 21a and 22a of the second tube bodies 21 and 22, respectively. The inner diameter ID1 of the first tube 10 is larger than the inner diameters ID21 and ID22 of the second tubes 21 and 22, for example.

The valve body 30 has a pressure receiving surface 31 , a pressure receiving surface 32 , an outer circumferential surface 33 , a connecting path 34 , a skirt portion 38 , and a stopper 39 . The valve body 30 is integrally formed to include, for example, a skirt portion 38 and a stopper 39. The outer peripheral surface 33 is connected to the pressure receiving surface 31 and extends along the first axis AX1. The pressure receiving surface 32 includes a surface 321, a surface 322, and a surface 323.

The connection path 34 is provided in the center of the valve body 30 along the first axis AX1. The connection path 34 connects the first portion P1 and the second portion P2. The connection path 34 has a connection port 35 on the side of the pressure receiving surface 31 and an enlarged diameter portion 37 communicating with the connection port 35 . The inner diameter ID37 of the enlarged diameter portion 37 is larger than the inner diameter ID35 of the connection port 35.

A protrusion 62 of a pressure guiding pipe 60 is connected to the connection port 35 from the pressure receiving surface 31 side. The flow path of the protrusion 62 communicates with the connection path 34 . The second portion P2 is connected to the first portion P1 by a protrusion 62. As described using FIG. 2, the protruding portion 62 is provided rotatably in the circumferential direction θ by, for example, the connecting portions 36, 64, etc.

The protrusion 62 has an opening 6a (second opening) on the end surface on the end 10a side. From another point of view, the opening 6a is located away from the pressure receiving surface 31 in the axial direction Dx1. The opening 6a intersects the first axis AX1, and in the example shown in FIGS. 11 and 12, it is perpendicular to the first axis AX1. The inner diameter ID61 of the opening 6a is, for example, 1/5 to 1/10 of the inner diameter ID1 of the first tube body 10.

The first tubular body 10 includes a straight portion P11 between the end portion 10a and the openings 13 and 14, and a branch portion P12 where the openings 13 and 14 are located. As shown in FIGS. 11 and 12, the opening 6a is located in the straight portion P11 in the axial direction Dx1. As shown in FIG. 12, the opening 6a is located in the straight portion P11 in the axial direction Dx1 when the unclosed portions O1 and O2 are expanded to the maximum, and does not overlap with the openings 13 and 14 in the radial direction Dr1.

From another point of view, the length of the protruding portion 62 in the axial direction Dx1 is such that the opening 6a is not located at the branch portion P12 in the axial direction Dx1. For example, the length of the protrusion 62 in the axial direction Dx1 is longer than the inner diameter of the openings 13 and 14. Even if the valve body 30 is moved toward the end portion 10b in the axial direction Dx1 compared to the example shown in FIG. 12, the opening 6a is preferably located in the straight portion P11.

In the straight portion P11, fluid flows in the direction from the end 10a to the end 10b in the axial direction Dx1. On the other hand, the branch portion P12 includes a fluid flow in a direction from the end portion 10a to the end portion 10b in the axial direction Dx1 and a fluid flow in a direction from the first axis AX1 toward the openings 13 and 14. A part of the fluid in the branch part P12 flows along the pressure receiving surface 31 to the second flow path 121 or the second flow path 122 via the openings 13 and 14. The pressure that the pressure receiving surface 31 receives is greater than the total pressure that is the sum of the static pressure and dynamic pressure of the fluid in the straight portion P11.

The fluid in the straight portion P11 flows into the second portion P2 from the protrusion 62 through the opening 6a. Therefore, the static pressure of the fluid in the second portion P2 acting on the pressure receiving surface 32 is approximately equal to the total pressure of the fluid in the straight portion P11. The total pressure of the fluid in the branch portion P12 acts on the pressure receiving surface 31. Since the total pressure of the fluid in the branch portion P12 is greater than the total pressure of the fluid in the straight portion P11, the valve body 30 resists the biasing force of the biasing member 70 and moves from the end 10a side to the end 10b in the axial direction Dx1. Can be moved to the side. On the other hand, the valve body 30 moves from the end 10b side to the end 10a side in the axial direction Dx1 due to the urging force of the urging member 70.

The valve body 30 is provided in the first flow path 110 in a movable state in the axial direction Dx1, as in each of the above-described embodiments. The movement of the valve body 30 in the pressure reducing valve 500 is the same as in each of the embodiments described above. Even with the structure of the pressure reducing valve 500 according to the fifth embodiment, it is possible to obtain the pressure reducing valve 500 having an excellent pressure reducing effect as in each of the above-described embodiments. Further, the same effects as those of the above-described embodiments can be obtained.

As described above, since the opening 6a is located in the straight portion P11 in the axial direction Dx1, the fluid in the second portion P2 is not easily influenced by the fluid in the branch portion P12. From another point of view, the influence of the dynamic pressure of the fluid in the branch portion P12 on the fluid in the second portion P2 is suppressed. Note that the spacer SP described in the third embodiment can also be provided in the fifth embodiment.

[Sixth embodiment]
A sixth embodiment will be described. Components similar to those in each of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 13 is a schematic partial cross-sectional view of a pressure reducing valve 600 according to the sixth embodiment. FIG. 14 is a schematic cross-sectional view of the pressure reducing valve 600 shown in FIG. 13 taken along line XIV-XIV. FIG. 13 shows the pressure reducing valve 600 viewed from the installation surface side (lower side). FIG. 14 shows the pressure reducing valve 600 viewed from the end 10a side to the end 10b side in the axial direction Dx1. FIG. 13 shows, as an example, before the valve body 30 moves (before fluid is supplied to the pressure reducing valve 600).

As shown in FIG. 13, the pressure reducing valve 600 includes a main body 1, a valve body 30, an adjusting member 40, a discharge port 50, and a biasing member 70. The main body 1 includes a first tube 10 and a second tube 21 connected to an opening 13 provided in the first tube 10 . A connector 10A is provided at the end 10a of the first tube 10, and a connector 21A is provided at the end 21a of the second tube 21. The inner diameter ID1 of the first tube 10 is equal to the inner diameter ID21 of the second tube 21, for example. The inner diameter ID1 of the first tube 10 may be larger or smaller than the inner diameter ID21 of the second tube 21.

The main body 1 further includes a groove 90 on the inner circumferential surface 12 that connects the first portion P1 and the second portion P2. The groove 90 is recessed from the inner circumferential surface 12 toward the outer circumferential surface 11, and is formed, for example, in parallel to the first axis AX1. The groove 90 has a first side wall 91 located in the first portion P1, a second side wall 92 located in the second portion P2, and a bottom wall 93 connecting the first side wall 91 and the second side wall 92. ing. The first side wall 91 and the second side wall 92 are parallel to the pressure receiving surfaces 31 and 32 in the example shown in FIG. In the example shown in FIG. 14, the bottom wall 93 is along the circumferential direction θ.

In the example shown in FIGS. 13 and 14, the groove 90 faces the opening 13. In the example shown in FIGS. The valve body 30 is located between the opening 13 and the groove 90. It is preferable that the groove 90 is formed at a position away from the opening 13. From another point of view, it is preferable that the groove 90 be formed apart from the streamline of the fluid flowing from the first portion P1 to the second flow path 121. The groove 90 is formed, for example, at a position overlapping the second axis AX21 in the radial direction Dr1. The fluid flowing through the first portion P1 passes through the groove 90 from between the first side wall 91 and the pressure receiving surface 31 in the axial direction Dx1, and flows into the second portion P2 from between the second side wall 92 and the pressure receiving surface 32.

The width W90 of the groove 90 in the circumferential direction θ is preferably small, and the depth D90 of the groove 90 is preferably deep. The depth D90 of the groove 90 is larger than, for example, the gap formed between the outer circumferential surface 33 of the valve body 30 and the inner circumferential surface 12 of the first tube body 10. The width W90 of the groove 90 and the depth D90 of the groove 90 are, for example, 1/5 to 1/10 of the inner diameter ID1 of the first tubular body 10.

In the axial direction Dx1, the first side wall 91 is separated from the pressure receiving surface 31 in a state where no fluid is flowing through the first tube body 10. Since the first side wall 91 is located closer to the end portion 10a than the pressure receiving surface 31, the groove 90 is formed in the first portion P1 of the valve body 30 when the outer circumferential surface 33 of the valve body 30 is most blocking the opening 13. The outer circumferential surface 33 has an unobstructed portion. The pressure reducing valve 600 allows fluid to flow from the first portion P1 to the second portion P2 through between the first side wall 91 and the pressure receiving surface 31 even if the valve body 30 does not move.

In the state where the valve body 30 has moved the most toward the end portion 10b, the second side wall 92 is located between the pressure receiving surface 32 and the end surface 41 of the adjustment member 40 in the axial direction Dx1. From another point of view, in a state where the outer circumferential surface 33 of the valve body 30 does not block the opening 13 most, the groove 90 has a portion that is not blocked by the outer circumferential surface 33 of the valve body 30 in the second portion P2.

The first side wall 91 is preferably located near the pressure receiving surface 31 when no fluid is flowing through the first tube body 10 . By providing the first side wall 91 near the pressure receiving surface 31, the fluid in the second portion P2 is less susceptible to the influence of the dynamic pressure of the fluid in the first portion P1. For example, when no fluid is flowing through the first pipe body 10, the distance from the first side wall 91 to the pressure receiving surface 31 in the axial direction Dx1 is approximately equal to the width W90 of the groove 90 or the depth D90 of the groove 90. preferable.

The valve body 30 is provided in the first flow path 110 in a movable state in the axial direction Dx1, as in each of the above-described embodiments. The movement of the valve body 30 in the pressure reducing valve 600 is the same as in each of the embodiments described above. In the example shown in FIG. 13, since fluid flows into the groove 90 from the vicinity of the pressure receiving surface 31, the static pressure of the second portion P2 tends to be equal to the static pressure of the fluid acting on the pressure receiving surface 31. From another point of view, the static pressure of the fluid in the second portion P2 is unlikely to differ from the static pressure acting on the pressure receiving surface 31. The groove 90 formed in the first pipe body 10 suppresses the influence of static pressure on the valve body 30.

Even with the structure of the pressure reducing valve 600 according to the sixth embodiment, it is possible to obtain the pressure reducing valve 600 having the same excellent pressure reducing effect as in each of the above-described embodiments. Further, the same effects as those of the above-described embodiments can be obtained. In the sixth embodiment, the influence of the static pressure of the fluid in the first portion P1 and the second portion P2 on the valve body 30 can be suppressed by the groove 90. Since the groove 90 is provided in the inner circumferential surface 12 of the first tubular body 10, the fluid in the second portion P2 is hardly affected by the dynamic pressure of the fluid flowing in the first portion P1.

The configuration of the pressure reducing valve 600 according to the sixth embodiment is only an example. The main body 1 in the sixth embodiment may have two or more second pipe bodies. In this case, the first tube 10 is formed with two or more openings for connection to the second tube. The total area of the two or more openings is larger than the flow path area of the first tube 10, for example. The total flow area of the second pipe body on the secondary side is larger than the flow passage area of the first pipe body 10 on the primary side.

Although one groove 90 is formed in the inner circumferential surface 12 of the first tubular body 10, two or more grooves 90 may be formed in the circumferential direction θ. The width W90 and the depth D90 of two or more grooves 90 may be equal or different. Also in the sixth embodiment, the shapes of the skirt portion 38 and the like of the valve body 30 described in the third embodiment can be applied.

As mentioned above, these embodiments are presented as examples, and the scope of the present invention is not limited to the configuration disclosed in each embodiment. These embodiments can be implemented in various other forms. These embodiments and modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

100, 200, 300, 400, 500, 600... pressure reducing valve, 1... main body, 10... first pipe body, 11... outer peripheral surface, 12... inner peripheral surface, 13, 14... opening, 15... locking surface, 21 , 22... Second pipe body, 30... Valve body, 31... Pressure receiving surface, 34... Connection path, 35... Connection port, 37... Expanded diameter part, 38... Skirt part, 39... Stopper, 60... Impulse pipe, 62... Projection portion, 65... Cover, 6a... Opening, 70... Biasing member, 90... Groove, 91... First side wall, 92... Second side wall, AX1... First shaft, AX21, AX22... Second shaft, BP1... Shielding Members: P1...first part, P2...second part, SP...spacer.

Claims (4)

a main body having a first tube and a second tube connected to the first tube through an opening provided in the first tube;
a valve body provided inside the first pipe body and having a pressure receiving surface on which the dynamic pressure of the fluid flowing through the first pipe body acts;
a first axis of the first tube intersects a second axis of the second tube;
The valve body separates the first pipe body into a first part on the pressure receiving surface side and a second part on the opposite side to the first part in the direction along the first axis,
The first pipe body has a groove connecting the first part and the second part on an inner circumferential surface facing the valve body,
In a state where the dynamic pressure is not acting on the pressure receiving surface, the opening has a portion that is not blocked by the valve body and a portion that is closed by the valve body,
The valve body moves along the first axis due to the dynamic pressure acting on the pressure receiving surface,
When the dynamic pressure acts on the pressure receiving surface and the valve body moves, a portion of the opening that is not blocked by the valve body expands.
Pressure reducing valve. The groove has a first side wall located in the first portion and a second side wall located in the second portion,
the first side wall is away from the pressure receiving surface in the direction along the first axis when no fluid is flowing through the first tube;
The pressure reducing valve according to claim 1. the groove faces the opening;
The pressure reducing valve according to claim 1 or 2. The inner diameter of the first tube is different from the inner diameter of the second tube.
The pressure reducing valve according to any one of claims 1 to 3.

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