JP7323907B2 - Check valves and valve bodies used for check valves - Google Patents

Description

The check valve and the valve body used for the check valve according to the present application relate to the technique of configuring the valve body of the check valve that opens or closes by movement of the valve body.

A check valve is a valve provided in a fluid flow path, and has a mechanism for preventing reverse flow due to back pressure of the fluid. For example, a pipe installed in an industrial plant transfers high-temperature, high-pressure steam, and in this pipe, along with the steam, drain (condensed water) generated from the steam flows in a predetermined direction (forward direction).

In order to prevent backflow of such steam and drain, check valves are provided at necessary locations on the piping. There are various types of check valves in terms of structure, and swing type check valves, lift type check valves, disk type check valves, and the like are known.

Among them, for example, a disk type check valve has a disk-shaped disk valve and a valve seat that are movably arranged in a main body. This disk valve is positioned so as to block a flow path formed in the main body of the check valve, and is urged by a coil spring in a direction of coming into contact with the valve seat surface of the valve seat.

When fluid such as drain flows in the forward direction from the inlet of the check valve, the pressure of this inflow compresses the coil spring, and the disk valve moves in parallel away from the valve seat to open the flow path. Open the valve to allow forward flow of drain, etc. Then, the drain or the like passes through the gap between the inner surface of the body and the side surface of the disk valve and flows out from the outflow port of the check valve.

On the other hand, if a backflow occurs in the drain, etc., and the drain, etc. enters in the reverse flow direction from the outflow port, the disk valve moves parallel due to the pressure from this backflow and the biasing force of the coil spring, and contacts the valve seat surface of the valve seat. to block the flow path and close the valve. As a result, the reverse flow of fluid such as drain is blocked by the check valve.

As such a disk-type check valve, there is a technique disclosed in Patent Document 1 described later. In the check valve disclosed in Patent Document 1, four support pieces 64 are formed on a support member 6 that supports a disc-shaped valve element 5 . The tops of these support pieces 64 are formed on a straight line, and the straight portions of the support pieces 64 support the valve body 5 from below when the valve is opened. As a result, the valve body 5 is supported in a stable posture in the stage before the backflow occurs, and when the backflow occurs, the valve body 5 moves up in parallel while maintaining the horizontal posture to close the valve. .

Japanese Patent Application Laid-Open No. 2016-38015

However, in the technique disclosed in the above-mentioned Patent Document 1, the disk valve may not move properly, and the check valve may malfunction. That is, the check valve is configured so that the gap between the inner surface of the valve chamber and the side surface of the disk valve is small in order to ensure reliable operation.

Therefore, if the posture of the parallel-moving disk valve deviates obliquely from the proper position, it may get caught on the inner surface of the valve chamber and become unable to move. For example, if the disc valve becomes jammed in an open state and becomes immobile, the reverse flow of fluid cannot be interrupted, impairing proper operation of the check valve.

In the technology disclosed in Patent Document 1 as well, since the gap between the inner peripheral surface 44 of the valve seat 4 and the side surface of the disk-shaped valve body 5 is small, when the valve body 5 moves, the valve body 5 , and there is a danger that it will get caught on the inner peripheral surface 44.

As described above, in the technique disclosed in Patent Document 1, the valve body 5 is supported in a stable position in advance before backflow occurs, so that when backflow occurs, the valve body 5 is It is devised so that it can move in parallel while maintaining a horizontal posture. However, since the valve body 5 itself is not provided with a mechanism for ensuring smooth movement, the risk of the valve body 5 being biased in the direction of oblique displacement and being caught on the inner peripheral surface 44 is sufficiently reduced. cannot be avoided.

In addition, the check valve disclosed in Patent Document 1 supports the valve body 5 in a stable posture in advance by supporting the valve body 5 from below with the linear portion of the support piece 64, so that the valve body 5 is horizontal. It is designed to move parallel while maintaining a good posture and rise. For this reason, although it is possible to install a check valve in a flow path through which fluid flows in the vertical direction, it is necessary to move the valve element in the horizontal direction to open or close the valve. Therefore, the configuration of the check valve disclosed in Patent Document 1 cannot reliably prevent the valve body 5 from being caught on the inner peripheral surface 44 .

Therefore, the check valve and the valve body used for the check valve according to the present application are intended to solve these problems, and by ensuring proper movement of the valve body, the malfunction of the check valve can be reliably prevented. It is an object of the present invention to provide a check valve and a valve body used for the check valve that can prevent damage.

The check valve according to the present application is
A main body having therein a flow path through which fluid passes in a predetermined forward direction and a valve chamber communicating with the flow path,
It is movably located in the valve chamber, receives the flow of fluid passing in the forward direction, opens the flow path, opens the valve, receives the flow of fluid in the forward and reverse directions, and opens the flow path. a valve body that closes and closes,
In a check valve comprising
A sliding portion provided on a side portion of the valve body positioned along a plane parallel to the reverse flow direction, the sliding portion being slidable against the inner surface of the valve chamber portion when the valve body moves. ,
characterized by comprising

Further, the valve body used for the check valve according to the present application is
The check valve is movably positioned in a valve chamber formed in the main body of the check valve, receives the flow of fluid passing in the forward direction, opens the flow path, and opens the valve to allow the fluid to flow in the forward and reverse directions. In a valve body used for a check valve that closes a flow path by receiving a flow,
A sliding portion provided on a side portion of the valve body positioned along a plane parallel to the reverse flow direction, the sliding portion being slidable against the inner surface of the valve chamber portion when the valve body moves. ,
characterized by comprising

In the check valve and the valve body used for the check valve according to the present application, the sliding portion provided on the side portion of the valve body positioned along the plane parallel to the backflow direction of the fluid, A sliding portion is provided that is slidable against the inner surface of the valve chamber portion when moving.

For this reason, when the valve body moves, the valve body can move smoothly due to the sliding of the sliding portion, and the posture of the valve body deviates obliquely from the appropriate position, causing the inner surface of the valve chamber portion to move. will not get caught. Therefore, by ensuring proper movement of the valve body, malfunction of the check valve can be reliably prevented.

1 is a partial cross-sectional view showing a check valve according to the present application and a disk-type check valve 1 which is a first embodiment of a valve body used in the check valve, and is a partial cross-sectional view showing a state when the valve is open. is. 2 is an enlarged cross-sectional view of the vicinity of a sliding ball 3a of the disk valve 2 shown in FIG. 1. FIG. FIG. 2 is a plan view of the disk valve 2 shown in FIG. 1; 2 is a partial cross-sectional view showing a closed state of the disk type check valve 1 shown in FIG. 1. FIG.

[Explanation of terms in the embodiment]
The main terms used in the following embodiments correspond to the following components of the check valve and the valve body used for the check valve according to the present application, respectively.
Disc valve 2... Valve element Sliding balls 3a, 3b, 3c... Sliding portion Valve chamber 7... Valve chamber portion Valve chamber 7, inlet 51 and outlet 52... Flow path Contact surface 7a・・・Inner surface of the valve chamber 1st body 11 and 2nd body 12・・・Body Direction of arrow 91・・・Forward direction Direction of arrow 92・・・Reverse flow direction Drain, etc.・・・Fluid

[First embodiment]
A first embodiment of a check valve and a valve body used for the check valve according to the present application will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a disc type check valve 1 according to the present embodiment, showing a state when the valve is opened, and FIG. 3 is a plan view of the disc valve 2, and FIG. 4 is a partial cross-sectional view showing the state of the disc type check valve 1 when the valve is closed.

(Description of the configuration of the disk type check valve 1)
As shown in FIG. 1, the disk-type check valve 1 has a first body 11 and a second body 12, and is configured with a valve chamber 7 formed therein. The first body 11 and the second body 12 are joined by a threaded portion 13, and a gasket 90 is sandwiched between them to keep the valve chamber 7 airtight.

An inflow port 51 is formed through the first body 11 and communicates with the valve chamber 7 . A pipe (not shown) is connected from the outside of the inflow port 51 . It flows into the valve chamber 7 along the direction. An outflow port 52 is formed through the second body 12 and communicates with the valve chamber 7, and a discharge pipe (not shown) is connected to the outside of the outflow port 52 so that drain and the like are discharged in the direction of the arrow 91. is discharged from the valve chamber 7 along the . The inner end surface of the first body 11 forming the valve chamber 7 functions as a valve seat surface 9. As shown in FIG.

A disc valve 2 is arranged in the valve chamber 7 . The disk valve 2 is freely movable in the valve chamber 7 along the arrow 91 direction. A spring receiver 17 is fixed to the valve chamber 7 , and a coil spring 15 is attached between the spring receiver 17 and the disk valve 2 . A coil spring 15 urges the disc valve 2 toward the valve seat surface 9 . The spring receiver 17 is formed with a spring receiver central hole 17a and a spring receiver circumferential hole 17b.

As shown in FIG. 3, the disk valve 2 has a substantially disk shape, and three sliding balls 3a, 3b, and 3c are provided on its side surface. Each of the sliding balls 3a, 3b, and 3c is spherical and arranged at equal intervals in the circumferential direction of the side surface of the disk valve 2. As shown in FIG. 1 and 4 show the cross section II of the disk valve 2 shown in FIG.

As shown in FIG. 2, the sliding ball 3a is rotatably held in a holding space 5a of a ball holding portion 4a formed by protruding from the side surface of the disk valve 2. As shown in FIG. The holding space 5a is open outward, and the diameter of this opening is slightly smaller than the diameter of the sliding ball 3a. Therefore, the slide ball 3a can be partially exposed from the side surface of the disc valve 2 to the outside. The sliding ball 3a exposed from the side surface of the disk valve 2 contacts the contact surface 7a of the valve chamber 7, and rotates and slides as the disk valve 2 moves.

The sliding balls 3b and 3c also have the same configuration as the sliding ball 3a. That is, as shown in FIG. 3, the sliding balls 3b and 3c are rotatably held in the holding spaces 5b and 5c of the ball holding portions 4b and 4c formed by protruding from the side surface of the disc valve 2, respectively. A part is exposed from the side of 2. Similarly to the sliding ball 3a, the sliding balls 3b and 3c also come into contact with the contact surface 7a of the valve chamber 7 and rotate and slide according to the movement of the disc valve 2. As shown in FIG. An elastic member (for example, a spring or rubber, not shown) may be housed in each holding space 5a, 5b, 5c to always urge the sliding balls 3a, 3b, 3c outward.

(Description of the operation of the disk type check valve 1)
Next, the operation of the disc type check valve 1 will be explained. When a fluid such as drain flows into the disk type check valve 1 from the inflow port 51 in the direction of the arrow 91, the disk valve 2 in the valve chamber 7 receives the inflow pressure, and the valve seat surface 9 The valve opens by moving parallel in the direction away from the At this time, the coil spring 15 is in a compressed state.

The inflowing drain or the like passes through a gap 81 formed between the side surface of the disc valve 2 and the inner surface (contact surface 7a) of the valve chamber 7, and flows around the back side of the disc valve 2, and further forms in the spring bearing 17. It passes through the spring receiving center hole 17a and the spring receiving peripheral hole 17b and is discharged from the outflow port 52 in the direction of the arrow 91. As shown in FIG.

On the other hand, when drain or the like flows backward in the direction of arrow 92 shown in FIG. to reach the back side of disk valve 2. Then, the disk valve 2 is moved in parallel by receiving the pressure due to backflow of drain or the like and the biasing force of the coil spring 15, and contacts the valve seat surface 9 to close the valve. As a result, backflow of drain or the like is blocked.

Here, as described above, three sliding balls 3a, 3b, and 3c are provided on the side surface of the disk valve 2, and are exposed from the side surface of the disk valve 2 and come into contact with the contact surface 7a of the valve chamber 7. ing. The sliding balls 3a, 3b, and 3c rotate and slide as the disc valve 2 moves.

Therefore, when the disk valve 2 moves, the sliding balls 3a, 3b, and 3c rotate and slide, so that the disk valve 2 can move smoothly, and the attitude of the disk valve 2 shifts obliquely. , and does not get caught on the contact surface 7a of the valve chamber 7. Therefore, by ensuring proper movement of the disc valve 2, malfunction of the disc type check valve 1 can be prevented.

[Other embodiments]
In the above-described embodiment, the disk valve 2 is used for the spring-type disk-type check valve 1, which is biased toward the valve seat surface 9 by the coil spring 15. Although an example in which a valve body is applied has been shown, it may also be applied to a disc type check valve that does not have a coil spring 15 .

Further, in the above-described embodiment, an example in which the check valve according to the present application and the valve body used for the check valve is applied to the disc type check valve was shown, but the movement of the valve body can be used to close or open the valve. It can also be applied to check valves of other types as long as they are check valves that perform For example, the check valve according to the present application and the valve body used for the check valve may be applied to a swing type check valve and a lift type check valve. That is, by providing a sliding portion in the valve body incorporated in the swing type check valve or the lift type check valve, smooth movement of the valve body is ensured, and malfunction of the check valve is reliably prevented.

In the above-described embodiment, the spherical sliding balls 3a, 3b, and 3c were illustrated as the sliding portions, but the present invention is not limited to this. Other configurations can be adopted as long as they can slide on the contact surface 7a (the inner surface of the valve chamber). For example, it is possible to use a sliding portion that is supported by a rotating shaft and slides against the inner surface of the valve chamber portion by rotating about the rotating shaft.

Also, in the above-described embodiment, three sliding balls 3a, 3b, and 3c are shown as sliding portions, but four or more or two or less sliding portions may be provided. Furthermore, although the three sliding balls 3a, 3b, and 3c are arranged at equal intervals in the circumferential direction of the side surface of the disk valve 2 (valve element), it is assumed that some or all of the intervals are different. It is also possible to arrange and configure the sliding portions so as to

In the above-described embodiment, the sliding balls 3a, 3b, and 3c, which are the sliding parts, are in contact with the contact surface 7a (the inner surface of the valve chamber) all the time. 3a, 3b, 3c and the contact surface 7a may be arranged so as to form a gap. Even in this case, when the disk valve 2 moves, if the posture of the disk valve 2 is biased in the direction of oblique displacement, the sliding balls 3a, 3b, and 3c come into contact with the contact surface 7a and rotate, causing the disk to move. Valve 2 floats smoothly.

Furthermore, guide grooves for guiding the sliding of the sliding balls 3a, 3b, 3c (sliding portions) may be formed on the contact surface 7a (inner surface of the valve chamber portion). By sliding the sliding balls 3a, 3b, 3c along the guide grooves, the disc valve 2 (valve element) can be stably floated.

1: Disc type check valve 2: Disc valve 3a, 3b, 3c: Sliding ball 7: Valve chamber
7a: contact surface 11: first body 12: second body 51: inlet
52: outlet

Claims (4)

A main body having therein a flow path through which fluid passes in a predetermined forward direction and a valve chamber communicating with the flow path,
It is movably located in the valve chamber, receives the flow of fluid passing in the forward direction, opens the flow path and opens the valve, receives the flow of fluid in the forward and reverse directions , and is on the valve seat surface. A disk-type valve body that closes the valve by contacting and closing the flow path;
In a check valve comprising
A retaining portion formed on a side portion of the disk-shaped valve body located along a plane parallel to the reverse flow direction, the holding portion having an inclined flat surface inclined with respect to a direction orthogonal to the forward or reverse flow direction. a holding portion that is formed on both the surface in contact with the valve seat surface and the surface on the opposite side thereof so that the thickness in the forward or reverse flow direction gradually decreases toward the inner surface of the valve chamber;
a sliding portion held by the holding portion, the sliding portion being slidable against the inner surface of the valve chamber portion when the disk-shaped valve element moves;
A check valve comprising: In the check valve according to claim 1,
A plurality of the sliding portions are arranged at equal intervals in the circumferential direction of the side portion of the disk-shaped valve body,
A check valve characterized by: In the check valve according to claim 1 or claim 2,
The sliding part is configured in a spherical shape and slides by rotating,
A check valve characterized by: The check valve is movably positioned within a valve chamber formed in the main body of the check valve, receives the flow of fluid passing in the forward direction, opens the flow path, and opens the valve to allow the flow of fluid in the forward and reverse directions. In a disk-type valve body used for a check valve that receives flow and contacts a valve seat surface to block a flow path and close the valve,
A retaining portion formed on a side portion of the disk-shaped valve body positioned along a plane parallel to the reverse flow direction, the holding portion having an inclined flat surface inclined with respect to a direction orthogonal to the forward or reverse flow direction. a holding portion that is formed on both the surface in contact with the valve seat surface and the surface on the opposite side thereof so that the thickness in the forward or reverse flow direction gradually decreases toward the inner surface of the valve chamber;
a sliding portion held by the holding portion, the sliding portion being slidable against the inner surface of the valve chamber portion when the disk-shaped valve element moves;
A valve body used for a check valve, characterized by comprising:

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