JP2021038814A - Relief valve - Google Patents

Abstract

To provide a relief valve capable of inhibiting fluctuations of a setting pressure effectively.SOLUTION: A relieve valve 1 includes: a control lever 20 rotatably supported by a valve body 10; and a valve lifting shaft 30 which is supported by the valve body 10 so as to move to the valve chamber 13 side along an axis L direction when the control lever 20 is rotated from a normal position to a forced valve opening position. The control lever 20 has a protruding part 24 extending in a rotation direction. The valve lifting shaft 30 has a linear recessed part 37 in which the protruding part 24 of the control lever 20 fits. A pressure regulation member 60 is configured so that the valve lifting shaft 30 may be inserted thereinto and its rotation around an axis L is restricted by the valve lifting shaft 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to, for example, a relief valve used in a water heater.

The relief valve is attached to, for example, a hot water storage tank of a water heater. The relief valve is configured to open when the pressure inside the tank on the primary side exceeds the set pressure to release the pressure to the outside of the tank on the secondary side. The relief valve has a pressure adjusting mechanism for adjusting the set pressure.

A conventional relief valve is disclosed in Patent Document 1. The relief valve of Patent Document 1 has a forced valve opening mechanism for forcibly opening the valve by moving the valve body via the valve lifting shaft by rotating the operating lever. The lift valve shaft has a rod-shaped first portion and a second portion in which a screw hole into which the first portion is screwed is formed. The lift valve shaft functions as a pressure adjusting mechanism that adjusts the set pressure according to the amount of screwing of the first portion into the second portion.

Japanese Unexamined Patent Publication No. 2008-138784

However, in the relief valve, since the first portion of the valve lift shaft and the valve body abut each other during the valve opening operation, the screwing amount of the lift valve shaft may change. Therefore, there is a possibility that the set pressure may deviate and the valve opening operation at an appropriate pressure may not be possible.

Therefore, an object of the present invention is to provide a relief valve capable of effectively suppressing the deviation of the set pressure.

In order to achieve the above object, the relief valve of the present invention rotates around the valve body and the valve body provided with the primary side flow path and the secondary side flow path connected to the valve chamber and the valve body. A freely supported operating lever and a valve lift shaft supported by the valve body so that when the operating lever is rotated from the normal position to the forced valve opening position, it moves toward the valve chamber side along the axial direction. And the valve body arranged in the valve chamber so as to face the valve shaft in the axial direction, and the valve so as to be moved to the valve shaft side when the fluid pressure in the primary side flow path rises. A tubular body arranged in a chamber and having a valve port opened and closed by the valve body, and a tubular body arranged so as to abut the valve body screwed into the valve body and moved to the lift shaft side. A relief valve having a pressure regulating member, wherein the operating lever has a convex portion or a concave portion extending in the rotation direction, and the lifting valve shaft is a straight line into which the convex portion of the operating lever fits. The pressure adjusting member has a concave portion having a shape or a linear convex portion that fits into the concave portion of the operating lever, and the valve shaft can be inserted into the pressure adjusting member, and rotation around the shaft is restricted by the valve shaft. It is characterized in that it is configured to be.

According to the present invention, the operating lever has a convex portion or a concave portion extending in the rotation direction. The lift valve shaft has a linear concave portion in which the convex portion of the operating lever fits, or a linear convex portion in which the convex portion of the operating lever fits. The pressure regulating member is configured so that the valve lift shaft can be inserted and the rotation around the shaft is regulated by the lift valve shaft. Since this is done, the convex portion (or concave portion) of the operating lever and the concave portion (or convex portion) of the lift valve shaft are fitted to regulate the rotation of the lift valve shaft around the axis of the lift valve. The rotation of the pressure regulating member around the shaft can be regulated via the shaft. Therefore, it is possible to suppress the change in the screwing amount of the pressure adjusting member and effectively suppress the deviation of the set pressure of the relief valve.

In the present invention, the cross-sectional shape of the portion of the valve lift shaft that is inserted into the pressure regulating member is polygonal or D-shaped, and the cross-sectional shape of the space inside the pressure regulating member is the valve shaft. It is preferable that the shape is the same as the cross-sectional shape of the above. By doing so, it is possible to regulate the rotation of the pressure regulating member around the axis with a relatively simple configuration.

In the present invention, a support groove further includes a spring member arranged so as to push the lifting valve shaft toward the operating lever side, a rotating shaft is provided on the valve body, and the operating lever supports the rotating shaft. The support groove extends in a direction orthogonal to the axial direction when the operating lever is in the normal position, and has an inlet into which the rotating shaft is inserted, and the operation. When the lever is in the normal position, it is preferable to have a second groove portion extending from the first groove portion in a direction approaching the valve lift shaft. When attaching the operating lever to the valve body, bring the operating lever in the same posture as the normal position close to the valve body, and insert the rotation shaft of the valve body into the first groove from the inlet. When the rotating shaft inserted into the first groove reaches the second groove, the valve shaft pushed by the spring member pushes the operating lever in the axial direction, and the rotating shaft enters the second groove. Then, the rotating shaft abuts on the end of the second groove and is rotatably supported. Therefore, the operating lever can be easily attached to the valve body.

In the present invention, a support groove further includes a spring member arranged so as to push the valve lifting shaft toward the operating lever, the operating lever is provided with a rotating shaft, and the valve body supports the rotating shaft. Is provided, the support groove extends in a direction orthogonal to the axial direction, and the first groove portion having an inlet into which the rotation shaft is inserted and the direction in which the first groove portion is separated from the valve lift shaft. It is preferable to have a second groove portion extending. When attaching the operating lever to the valve body, bring the operating lever close to the valve body and insert the rotating shaft of the operating lever into the first groove from the inlet. When the rotating shaft inserted into the first groove reaches the second groove, the valve shaft pushed by the spring member pushes the operating lever in the axial direction, and the rotating shaft enters the second groove. Then, the rotating shaft abuts on the end of the second groove and is rotatably supported. Therefore, the operating lever can be easily attached to the valve body.

According to the present invention, the deviation of the set pressure can be effectively suppressed.

It is a perspective view of the relief valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the closed state of the relief valve of FIG. It is sectional drawing which shows the state just before opening of the relief valve of FIG. It is sectional drawing which shows the valve opening state of the relief valve of FIG. It is sectional drawing which shows the backflow state of the relief valve of FIG. It is sectional drawing which shows the forced valve opening state of the relief valve of FIG. It is a perspective view of the operation lever which the relief valve of FIG. 1 has. It is a perspective view of the lift valve shaft which the relief valve of FIG. 1 has. It is a perspective view which shows the mode that the operation lever is attached to the valve body in the relief valve of FIG. It is a perspective view of the relief valve which concerns on 2nd Embodiment of this invention. It is a perspective view which includes a partial cross section of the relief valve of FIG. It is a perspective view which includes the cross section of the valve body which the relief valve of FIG. 10 has. It is a perspective view of the operation lever which the relief valve of FIG. 10 has. It is a perspective view which shows the mode that the operation lever is attached to the valve body in the relief valve of FIG.

(First Example)
Hereinafter, the relief valve according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

FIG. 1 is a perspective view of a relief valve according to a first embodiment of the present invention. 2 to 6 are cross-sectional views (longitudinal cross-sectional views) along the axis of the relief valve of FIG. 1, showing a valve closed state, a valve immediately preceding state, a valve opening state, a backflow state, and a forced valve opening state, respectively. .. FIG. 7 is a perspective view of the operating lever included in the relief valve of FIG. FIG. 8 is a perspective view of a lift shaft included in the relief valve of FIG. FIG. 9 is a perspective view showing how the operating lever is attached to the valve body in the relief valve of FIG.

The relief valve of this embodiment is attached to a hot water storage tank of a hot water supply device. This relief valve is configured to open when the pressure inside the tank, which is the primary side, exceeds the set pressure, and to release the pressure to the outside of the tank, which is the secondary side, which is open to the atmosphere.

As shown in each figure, the relief valve 1 of this embodiment includes a valve body 10, an operating lever 20, a valve lifting shaft 30, a diaphragm body 40, a valve body 50, and a pressure adjusting member 60. doing.

The valve body 10 has a first case 11 and a second case 12 made of a separable synthetic resin. The first case 11 and the second case 12 are fixed to each other by screws. The valve body 10 has a valve chamber 13 formed inside. The first case 11 has a primary side pipe portion 11a extending in the axis L direction (axial direction), and a primary side flow path 14 is provided inside the primary side pipe portion 11a. The second case 12 has a straight tubular secondary side pipe portion 12a extending in a direction orthogonal to the axis L, and a secondary side flow path 15 is provided inside the secondary side pipe portion 12a. There is. The primary side flow path 14 and the secondary side flow path 15 are connected to the valve chamber 13. At the time of use, the relief valve 1 is arranged so that the axis L is horizontal and the tip end portion of the secondary side pipe portion 12a faces downward, as shown in FIG.

The second case 12 is provided with a support hole 16 along the axis L direction penetrating from the valve chamber 13 to the end surface 12b. The support hole 16 has a female screw portion 16a, a guide portion 16b, and a spring accommodating portion 16c in this order from the valve chamber 13 side. Mounting portions 17 and 17 are erected on the end surface 12b of the second case 12 so as to sandwich the support hole 16 (FIG. 9). The mounting portions 17 and 17 are provided with rotating shafts 18 and 18 projecting outward.

The operation lever 20 is made of synthetic resin, and as shown in FIG. 7, the flat plate-shaped operation portion 21, the legs 22 and 22 erected on the lower surface 21a of the operation portion 21, and the leg portion 22 on the lower surface 21a. , A cam portion 23 provided between 22 and 22 are integrally provided. The cam surface 23a of the cam portion 23 is provided with a convex portion 24 extending in the rotation direction of the operating lever 20. The operating lever 20 is provided with support grooves 25, 25 on the inner surfaces of the legs 22, 22. The support grooves 25, 25 rotatably support the rotation shafts 18, 18. When the operating lever 20 is rotated, the operating unit 21 is arranged at a normal position (positions shown in FIGS. 1 to 5) orthogonal to the axis L, and the operating unit 21 is arranged parallel to the axis L. It is positioned at the forced valve opening position (position shown in FIG. 6). The operating lever 20 is provided with a tool insertion hole 28 that penetrates the operating portion 21 and the cam portion 23.

The support groove 25 is formed in a substantially L shape, and has a first groove portion 26 and a second groove portion 27. The first groove portion 26 extends in a direction orthogonal to the axis L when the operating lever 20 is in the normal position. The first groove portion 26 is provided with an inlet 26a for inserting the rotating shaft 18 into the first groove portion 26. The second groove portion 27 is continuously provided in the first groove portion 26, and extends from the first groove portion 26 in a direction approaching the valve lift shaft 30 along the axis L direction when the operating lever 20 is in the normal position. There is.

The lift valve shaft 30 is made of synthetic resin, is inserted into the support hole 16 of the valve body 10, and is supported by the support hole 16 so as to be movable in the axis L direction. As shown in FIG. 8, the lift valve shaft 30 integrally includes a body portion 31, a tip portion 32, and a flange portion 33. The body portion 31 is formed in a columnar shape. The body portion 31 has an outer diameter substantially the same as the inner diameter of the guide portion 16b of the support hole 16. An O-ring 34 is arranged between the body portion 31 and the guide portion 16b. The tip portion 32 is formed in a hexagonal columnar shape having a smaller diameter than the body portion 31. The tip portion 32 is coaxially connected to the end portion of the body portion 31 on the valve chamber 13 side. The flange portion 33 is formed in an annular shape having a diameter larger than that of the body portion 31. The flange portion 33 is provided at the end of the body portion 31 on the operation lever 20 side. The flange portion 33 is pushed toward the operating lever 20 side along the axis L direction by a lift valve spring 35 made of a compression coil spring as a spring member arranged in the spring accommodating portion 16c of the support hole 16.

A hexagonal tool fitting hole 36 is provided in the center of the circular end surface 30a on the flange portion 33 side of the lift valve shaft 30. A hexagon wrench inserted through the tool insertion hole 28 is fitted into the tool fitting hole 36. Further, the end surface 30a is provided with a plurality of linear recesses 37. The recesses 37 are arranged so as to intersect at the center of the end face 30a. In this embodiment, three recesses 37 are provided. The convex portion 24 of the operating lever 20 fits into the concave portion 37. When the convex portion 24 fits into the concave portion 37, the rotation of the valve lift shaft 30 around the axis L is restricted.

The end surface 30a of the lift valve shaft 30 is in contact with the cam surface 23a of the operating lever 20, and when the operating lever 20 is rotated, the cam surface 23a slides on the end surface 30a. When the operating lever 20 is rotated from the normal position to the forced valve opening position, it is pushed by the cam surface 23a and the lift valve shaft 30 moves toward the valve chamber 13 side in the support hole 16.

The diaphragm body 40 is arranged in the valve chamber 13 so as to partition the primary side flow path 14 and the secondary side flow path 15. The diaphragm body 40 has a diaphragm 41 made of synthetic resin, a valve receiver 42 made of metal such as stainless steel, and a spring receiver 43. The diaphragm 41 is formed in an annular shape with an open central portion. The diaphragm 41 is fixed to the valve body 10 by sandwiching the outer peripheral edge portion between the first case 11 and the second case 12. The valve receiver 42 integrally includes a cylindrical portion 42a and a ring plate-shaped seat portion 42b. The cylindrical portion 42a is provided with a valve port 42c inside. The valve port 42c is opened and closed by the valve body 50. The cylindrical portion 42a is inserted inside the diaphragm 41. The sheet portion 42b is continuously provided at the end of the cylindrical portion 42a on the primary side flow path 14 side. The spring receiver 43 integrally has an annular plate-shaped bottom wall portion 43a and a peripheral wall portion 43b provided on the peripheral edge portion of the bottom wall portion 43a. Inside the bottom wall portion 43a, the end portion of the cylindrical portion 42a of the valve receiver 42 on the secondary side flow path 15 side is fixed by caulking. The valve receiver 42 and the spring receiver 43 sandwich the inner peripheral edge portion of the diaphragm 41 between the seat portion 42b and the bottom wall portion 43a. The central portion of the diaphragm body 40 in which the valve receiver 42 and the spring receiver 43 are arranged is moved to the first case 11 side by a relief spring 44 composed of a compression coil spring arranged between the bottom wall portion 43a and the first case 11. It is being pushed toward. The diaphragm body 40 is arranged in the valve chamber 13 so that the central portion is moved to the valve lifting shaft 30 side when the fluid pressure in the primary side flow path 14 rises.

The valve body 50 is arranged on the first case 11 side of the diaphragm body 40 in the valve chamber 13. The valve body 50 has a valve pedestal 51 made of synthetic resin and a valve member 52 made of an elastic member such as a rubber material. The valve pedestal 51 integrally has a cylindrical small-diameter portion 51a and a cylindrical large-diameter portion 51b connected to the end of the small-diameter portion 51a. The small diameter portion 51a is inserted through the valve port 42c and faces the tip end portion 32 of the lift valve shaft 30 in the L direction of the axis. The outer peripheral surface of the large diameter portion 51b is in contact with the first case 11, and is supported by the first case 11 so as to be movable in the axis L direction. The valve body 50 is pushed toward the second case 12 side by a valve spring 53 composed of a compression coil spring arranged between the large diameter portion 51b and the first case 11. The valve member 52 is formed in an annular shape. A small diameter portion 51a is inserted inside the valve member 52, and the valve member 52 is fixed on the end surface of the large diameter portion 51b on the small diameter portion 51a side. The valve member 52 closes the valve port 42c when it comes into contact with the seat portion 42b of the valve receiver 42, and opens the valve port 42c when it separates from the seat portion 42b.

The pressure adjusting member 60 is made of synthetic resin and is formed in a cylindrical shape. A male screw portion 60a is provided on the outer peripheral surface of the pressure adjusting member 60. The male threaded portion 60a is screwed into the female threaded portion 16a of the support hole 16. The amount of protrusion of the pressure adjusting member 60 into the valve chamber 13 changes depending on the amount of the male threaded portion 60a screwed into the female threaded portion 16a. The pressure (set pressure) at which the relief valve 1 is opened is adjusted by the amount of screwing of the pressure adjusting member 60 (that is, the amount of protrusion into the valve chamber 13). The set pressure and the set negative pressure described later are based on the fluid pressure of the secondary side flow path 15. In this embodiment, since the secondary side flow path 15 is open to the atmosphere, the set pressure and the set negative pressure are set with reference to the atmospheric pressure.

The pressure adjusting member 60 is configured so that the tip portion 32 of the valve lift shaft 30 can be inserted and the rotation around the axis L is restricted by the lift valve shaft 30. Specifically, the cross-sectional shape of the inner space of the pressure regulating member 60 (the cross-sectional shape in the direction orthogonal to the axis L) is the same hexagonal shape as the cross-sectional shape of the tip portion 32 of the valve lift shaft 30. .. As a result, when the valve lift shaft 30 is rotated around the axis L, the pressure regulating member 60 is also rotated, and when the rotation of the valve lifting shaft 30 around the axis L is regulated, the rotation of the pressure regulating member 60 is also regulated. .. The cross-sectional shape of the tip portion 32 of the lift valve shaft 30 (that is, the portion inserted through the pressure adjusting member 60) is polygonal or D-shaped, and the cross-sectional shape of the inner space of the pressure adjusting member 60 is the tip portion. It is preferable that the shape is the same as the cross-sectional shape of 32.

In this embodiment, the support hole 16, the valve shaft 30, the valve spring 35, the diaphragm body 40 (valve port 42c), the relief spring 44, the valve body 50, the valve spring 53, and the pressure adjusting member 60 have their respective shafts. It is arranged so as to coincide with the axis L (that is, to be coaxial).

Next, an example of the operation of the relief valve 1 of this embodiment will be described with reference to FIGS. 2 to 6.

When the fluid pressure of the primary side flow path 14 is lower than the set pressure, as shown in FIG. 2, the valve member 52 of the valve body 50 comes into contact with the seat portion 42b of the diaphragm body 40, and the valve port 42c is closed (valve closed). Status).

When the fluid pressure in the primary side flow path 14 rises, the central portion of the diaphragm body 40 moves to the second case 12 side (lift valve shaft 30 side) against the force of the relief spring 44, and the valve body 50 also moves to the valve spring 53. Pushed to move to the second case 12 side. Then, when the fluid pressure of the primary side flow path 14 is immediately before the set pressure, as shown in FIG. 3, the small diameter portion 51a of the valve body 50 abuts on the pressure adjusting member 60 and moves to the second case 12 side of the valve body 50. Movement is restricted (state just before valve opening). Even in this state, the valve member 52 is in contact with the seat portion 42b.

Then, when the fluid pressure of the primary side flow path 14 reaches the set pressure, as shown in FIG. 4, the central portion of the diaphragm body 40 further moves to the second case 12 side, and the valve member 52 to the seat portion 42b move. The valve port 42c opens apart (valve open state). As a result, the fluid flows out from the primary side flow path 14 to the secondary side flow path 15, and the increase in the fluid pressure in the primary side flow path 14 is suppressed.

Alternatively, when the fluid pressure of the primary side flow path 14 becomes lower than the fluid pressure of the secondary side flow path 15 and the fluid pressure of the primary side flow path 14 becomes equal to or less than the set negative pressure, as shown in FIG. 5, the first The seat portion 42b of the valve receiver 42 abuts against the movement restricting portion 11b of the case 11 to restrict the movement of the central portion of the diaphragm body 40 to the first case 11 side, and only the valve body 50 opposes the force of the valve spring 53. Move to the first case 11 side. Therefore, the valve member 52 separates from the seat portion 42b and the valve port 42c opens (backflow state). As a result, gas (atmosphere) flows from the secondary side flow path 15 into the primary side flow path 14, and the decrease in fluid pressure in the primary side flow path 14 is suppressed.

Further, as shown in FIG. 6, when the operating lever 20 is rotated from the normal position to the forced valve opening position, the valve lift shaft 30 moves toward the valve chamber 13 along the axis L direction, and the valve lift shaft 30 The tip portion 32 of the valve body 50 abuts on the small diameter portion 51a of the valve body 50 to move the valve body 50 toward the first case 11. As a result, the valve member 52 is separated from the seat portion 42b and the valve port 42c is opened (forced valve opening state).

Next, a method of attaching the operating lever 20 to the valve body 10 will be described with reference to FIG.

One of the plurality of recesses 37 of the lift valve shaft 30 is made parallel to the direction D1 orthogonal to the facing direction of the mounting portions 17 and 17, and the lift valve shaft 30 is opposed to the lift valve spring 35 to form a valve chamber. It is assumed that it is pushed to the 13 side. The operating lever 20 in the same posture as the normal position is brought closer to the valve body 10 along the direction D1, and the rotating shaft 18 of the valve body 10 is inserted into the first groove portion 26 from the inlet 26a of the support groove 25 of the operating lever 20. Insertion of the rotation shaft 18 proceeds to reach the second groove portion 27 in the first groove portion 26. At the same time as inserting the rotating shaft 18 into the first groove 26, the convex portion 24 of the operating lever 20 is inserted into the concave portion 37 of the valve lifting shaft 30, and the convex portion 24 is fitted into the concave portion 37. When the rotating shaft 18 reaches the second groove portion 27, the operating lever 20 is pushed by the lifting valve shaft 30 pushed by the lifting valve spring 35 in the direction D2 parallel to the axis L, and the rotating shaft 18 is pushed by the second groove portion 27. Enter into. Then, the rotating shaft 18 abuts on the end of the second groove 27 and is rotatably supported. As a result, the operating lever 20 can be easily attached to the valve body 10.

From the above, according to the relief valve 1 of the present embodiment, the operating lever 20 has a convex portion 24 extending in the rotation direction. The lift valve shaft 30 has a linear concave portion 37 into which the convex portion 24 of the operating lever 20 fits. The pressure adjusting member 60 is configured so that the valve lift shaft 30 can be inserted and the rotation around the axis L is regulated by the lift valve shaft 30. As a result, the convex portion 24 of the operating lever 20 and the concave portion 37 of the lift valve shaft 30 are fitted to each other to regulate the rotation of the lift valve shaft 30 around the axis L, so that the lift valve shaft 30 can be moved. The rotation of the pressure adjusting member 60 around the axis L can be regulated through the method. Therefore, it is possible to suppress the change in the screwing amount of the pressure adjusting member 60 and effectively suppress the deviation of the set pressure of the relief valve 1. A configuration may be adopted in which the operating lever 20 has a concave portion and the lift valve shaft 30 has a linear convex portion on the end surface 30a.

Further, the cross-sectional shape of the tip portion 32 of the valve lift shaft 30 is a hexagonal shape, and the cross-sectional shape of the inner space of the pressure adjusting member 60 is the same hexagonal shape as the cross-sectional shape of the valve lift shaft 30. By doing so, it is possible to regulate the rotation of the pressure regulating member 60 around the axis L with a relatively simple configuration.

(Second Example)
Hereinafter, the relief valve according to the second embodiment of the present invention will be described with reference to FIGS. 10 to 14.

FIG. 10 is a perspective view of a relief valve according to a second embodiment of the present invention. FIG. 11 is a perspective view including a partial cross section of the relief valve of FIG. FIG. 12 is a perspective view including a cross section of a second case of the valve body included in the relief valve of FIG. FIG. 13 is a perspective view of the operating lever included in the relief valve of FIG. FIG. 14 is a perspective view showing how the operating lever is attached to the valve body in the relief valve of FIG.

The relief valve 2 of the second embodiment has a valve body 10A and an operation lever 20A having different configurations from the valve body 10 and the operation lever 20 of the relief valve 1 of the first embodiment described above, and the other configurations are the first. It is the same as the relief valve 1 of 1 Example. In the following description, the same components as those of the relief valve 1 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The valve body 10A has a first case 11 and a second case 112 made of separable synthetic resin. The first case 11 and the second case 112 are fixed to each other by screws. The valve body 10A has a valve chamber 13 formed inside. The second case 112 has a secondary side pipe portion 12a extending in a direction orthogonal to the axis L, and a secondary side flow path 15 is provided inside the secondary side pipe portion 12a.

The second case 12 is provided with a support hole 16 along the axis L direction penetrating from the valve chamber 13 to the end surface 12b. The support hole 16 has a female screw portion 16a, a guide portion 16b, and a spring accommodating portion 16c in this order from the valve chamber 13 side. Mounting portions 117 and 117 are erected on the end surface 12b of the second case 12 so as to sandwich the support hole 16. Support grooves 125 and 125 are provided on the inner surface of the mounting portions 117 and 117.

The support groove 125 is formed in a substantially L shape, and has a first groove portion 126 and a second groove portion 127. The first groove portion 126 extends in a direction orthogonal to the axis L. The first groove portion 126 is provided with an inlet 126a for inserting the rotation shaft 118 of the operating lever 20A into the first groove portion 126. The second groove portion 127 is continuously provided in the first groove portion 126, and extends from the first groove portion 26 in a direction away from the valve lift shaft 30 along the axis L direction.

The operating lever 20A is made of synthetic resin, and as shown in FIG. 13, the flat plate-shaped operating portion 121 and the substantially rectangular parallelepiped cam portion 123 provided at one end of the operating portion 121 are integrally integrated. Have. The cam surface 123a of the cam portion 123 is provided with a convex portion 124 extending in the rotation direction of the operating lever 20A. Rotating shafts 118 and 118 projecting outward are provided on the side surface of the cam portion 123. The rotating shafts 118 and 118 are rotatably supported by the support grooves 125 and 125 of the valve body 10A. As a result, the operating lever 20A is rotated so that the operating portion 121 is positioned at the normal position arranged so as to be orthogonal to the axis L and the operating portion 121 at the forced valve opening position arranged parallel to the axis L. .. The operating lever 20A is provided with a tool insertion hole 128 that penetrates the operating portion 121 and the cam portion 123.

The convex portion 124 of the operating lever 20A fits into the concave portion 37 of the lift valve shaft 30. When the convex portion 124 fits into the concave portion 37, the rotation of the valve lift shaft 30 around the axis L is restricted.

Next, a method of attaching the operating lever 20A to the valve body 10A will be described with reference to FIG.

One of the plurality of recesses 37 of the lift valve shaft 30 is made parallel to the direction D1 orthogonal to the opposite direction of the mounting portions 117 and 117, and the lift valve shaft 30 is opposed to the lift valve spring 35 to form a valve chamber. It is assumed that it is pushed to the 13 side. The operating lever 20A in the same posture as the normal position is brought closer to the valve body 10A along the direction D1, and the rotation shaft 118 of the operating lever 20A is inserted into the first groove 126a from the inlet 126a of the support groove 125 of the valve body 10A. Insertion of the rotation shaft 118 is advanced until it reaches the second groove portion 127 in the first groove portion 126. At the same time as inserting the rotating shaft 118 into the first groove 126, the convex portion 124 of the operating lever 20A is inserted into the concave portion 37 of the valve lifting shaft 30, and the convex portion 124 is fitted into the concave portion 37. When the rotating shaft 118 reaches the second groove portion 127, the operating lever 20A is pushed by the lifting valve shaft 30 pushed by the lifting valve spring 35 in the direction D2 parallel to the axis L, and the rotating shaft 118 is pushed by the second groove portion 127. Enter into. Then, the rotating shaft 118 abuts on the end of the second groove portion 127 and is rotatably supported. As a result, the operating lever 20A can be easily attached to the valve body 10A.

The relief valve 2 of this embodiment also has the same effect as that of the relief valve 1 of the first embodiment described above.

Although examples of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-described embodiment, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.

1, 2 ... Relief valve, 10, 10A ... Valve body, 11 ... First case, 11a ... Primary side pipe, 11b ... Movement control, 12, 112 ... Second case, 12a ... Secondary side pipe, 12b ... end face, 13 ... valve chamber, 14 ... primary side flow path, 15 ... secondary side flow path, 16 ... support hole, 16a ... female threaded part, 16b ... guide part, 16c ... spring accommodating part, 17, 117 ... mounting part , 18, 118 ... Rotating shaft, 20, 20A ... Operating lever, 21, 121 ... Operating part, 22 ... Leg part, 23, 123 ... Cam part, 23a, 123a ... Cam surface, 24, 124 ... Convex part, 25 , 125 ... Support groove, 26, 126 ... First groove, 26a, 126a ... Inlet, 27, 127 ... Second groove, 28, 128 ... Tool insertion hole, 30 ... Lift valve shaft, 30a ... End face, 31 ... Body , 32 ... Tip, 33 ... Flange, 34 ... O-ring, 35 ... Lifting spring, 36 ... Tool fitting hole, 37 ... Recess, 40 ... Diaphragm body, 41 ... Diaphragm, 42 ... Valve receiver, 42a ... Cylindrical Part, 42b ... Seat part, 42c ... Valve port, 43 ... Spring receiver, 43a ... Bottom wall part, 43b ... Peripheral wall part, 44 ... Relief spring, 50 ... Valve body, 51 ... Valve pedestal, 51a ... Small diameter part, 51b ... Large diameter part, 52 ... valve member, 53 ... valve spring, 60 ... pressure adjusting member, 60a ... male threaded part

Claims (4)

A valve body provided with a valve chamber and a primary side flow path and a secondary side flow path connected to the valve chamber, an operation lever rotatably supported by the valve body, and the operation lever at a normal position. The valve shaft supported by the valve body so as to move toward the valve chamber side along the axial direction when rotated to the forced valve opening position, and the valve shaft so as to face the valve shaft in the axial direction. A valve body arranged in the valve chamber and a valve port arranged in the valve chamber so as to be moved to the lift shaft side when the fluid pressure in the primary side flow path rises, and opened and closed by the valve body. A relief valve having a diaphragm body and a tubular pressure adjusting member screwed into the valve body and arranged so that the valve body moved to the lift shaft side abuts.
The operating lever has a protrusion or a recess extending in the direction of rotation.
The valve lift shaft has a linear concave portion in which the convex portion of the operating lever fits, or a linear convex portion that fits in the concave portion of the operating lever.
The pressure adjusting member is a relief valve characterized in that the lift valve shaft is insertable and the rotation around the shaft is regulated by the lift valve shaft. The cross-sectional shape of the portion of the valve lift shaft that is inserted into the pressure regulating member is polygonal or D-shaped.
The relief valve according to claim 1, wherein the cross-sectional shape of the inner space of the pressure adjusting member is the same as the cross-sectional shape of the lift shaft. Further having a spring member arranged to push the valve lift shaft toward the operating lever side,
A rotation shaft is provided on the valve body.
The operating lever is provided with a support groove for supporting the rotating shaft.
The support groove
A first groove portion extending in a direction orthogonal to the axial direction when the operating lever is in the normal position and having an inlet into which the rotating shaft is inserted.
The relief valve according to claim 1 or 2, further comprising a second groove portion extending from the first groove portion in a direction approaching the lift shaft when the operating lever is in the normal position. .. Further having a spring member arranged to push the valve lift shaft toward the operating lever side,
A rotating shaft is provided on the operating lever.
The valve body is provided with a support groove for supporting the rotation shaft.
The support groove
A first groove portion extending in a direction orthogonal to the axial direction and having an inlet into which the rotating shaft is inserted.
The relief valve according to claim 1 or 2, further comprising a second groove portion extending from the first groove portion in a direction away from the lifting valve shaft.

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