JP7118414B2 - overpressure relief valve - Google Patents

Description

The technology disclosed in the present application relates to an overpressure relief valve provided in a water heater or the like.

Conventionally, in order to prevent damage to the main body or piping of a water pump or water heater due to the internal pressure exceeding a predetermined pressure, the internal pressure of the main body or piping has been reduced. An overpressure relief valve that releases internal pressure to the atmosphere or another path when a predetermined pressure is exceeded is disclosed in, for example, Patent Document 1 and the like.

In Patent Document 1, a ball is biased by a spring on a slanted seat between a small diameter portion and a large diameter portion of a hole provided inside the safety valve set, and the safety valve cap is provided on the side of the safety valve set. A safety valve is disclosed that meshes with a female screw and acts in the direction of compressing the spring so that the force (load) urging the ball of the spring when the cap is fully tightened can be the desired pressure to operate the safety valve.

Japanese Utility Model Laid-Open No. 03-30598

The safety valve described in Patent Document 1 is assembled by completely tightening the cap of the safety valve with a female screw provided on the side of the safety valve set, so the cap needs to be loosened and tightened every time the safety valve is maintained. Therefore, the work tends to be complicated during assembly and maintenance. In addition, if it is not possible to confirm that the screw is completely tightened, and if the screw cannot be completely tightened due to improper fitting, etc., the force (load) of the spring that biases the ball will not meet the desired pressure. There is a risk that the safety valve will operate due to unintended pressure. In addition, it is highly necessary to process the female screw on the side of the safety valve set in a post-processing, which tends to increase the cost of parts and the work of completely tightening the cap tends to be complicated, which increases the manufacturing cost. There is also fear.

The technology disclosed in the present application has been proposed in view of the above problems, and provides an overpressure relief valve that can be easily assembled and stably operated at a predetermined pressure. intended to provide

In order to achieve the above object, the overpressure relief valve according to claim 1 comprises a valve seat provided in a pressure relief passage in a pressure relief pipe, a valve body seated on the valve seat, and a valve body seated on the valve seat. The overpressure relief valve is composed of an urging member that urges in a direction, an urging member retainer arranged to face the valve body and supporting the urging member, and a relief passage formed in the side surface of the valve body. and a concave portion provided on the inner side surface of the rear end portion of the pressure relief pipe and fitted with the convex portion. A locking groove connected to the groove is provided, and the projection of the biasing member retainer is fitted into the lock groove of the recess of the pressure relief pipe to hold the biasing member retainer.

The overpressure relief valve according to claim 2 is the overpressure relief valve according to claim 1, wherein the valve body includes a valve portion seated on a valve seat formed of an elastic member and a valve portion formed of a hard member. It is characterized by being composed of a valve part presser that supports the

The overpressure relief valve according to claim 3 is the overpressure relief valve according to claim 2 , wherein the biasing member is a cylindrical coil spring, and the rear portion of the valve portion retainer and the front portion of the biasing member retainer are It is formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the coil spring, and the rear part of the valve part retainer and the front part of the biasing member retainer face each other, and the biasing member retainer is held in a state in which the coil spring is inserted into the coil spring. and

In the overpressure relief valve according to claim 4, in the overpressure relief valve according to any one of claims 1 to 3, a hexagonal wrench, a slotted screwdriver, or a Phillips screwdriver is provided on the rear end surface of the biasing member retainer. It is characterized by providing a recess for fitting.

The overpressure relief valve according to claim 5 is the overpressure relief valve according to any one of claims 1 to 4, wherein the biasing member retainer is provided with a communication hole penetrating in the axial direction, When the relief valve is actuated, the pressure released from the relief path formed on the side surface of the valve body is released to the atmosphere through the communication hole.

The overpressure relief valve according to claim 6 is the overpressure relief valve according to any one of claims 1 to 5, wherein one end of the lock groove of the recess is connected to the guide groove, and the other end is connected to the guide groove. is provided with a wall for locking the projection of the biasing member retainer.

The overpressure relief valve according to claim 7 is the overpressure relief valve according to any one of claims 1 to 6, wherein the lock groove of the recess provided on the inner side surface of the pressure relief pipe is provided on the side surface of the pressure relief pipe. characterized by being an opening penetrating the

An overpressure relief valve according to claim 8 is the overpressure relief valve according to any one of claims 1 to 7, wherein the lock groove of the recess provided on the inner surface of the pressure relief pipe is provided in the pressure relief pipe. A plurality of lock grooves are provided along the urging member retainer, and each lock groove is connected by a connection groove that fits with the projection of the urging member retainer.

The overpressure relief valve according to claim 9 is the overpressure relief valve according to any one of claims 1 to 8, wherein the outer peripheral surface of the side surface of the valve body has at least three valves contacting the inner surface of the pressure relief pipe. Kamaboko-shaped protrusions with arc-shaped outer circumferences are provided at approximately equal intervals, and the relief path is formed by a gap between the inner surface of the pressure relief pipe and the outer peripheral surface of the valve body generated by the Kamaboko-shaped protrusions. It is characterized by

In the overpressure relief valve according to claim 1, the convex portion of the biasing member retainer is fitted into the lock groove of the concave portion of the pressure relief pipe through the guide groove of the concave portion of the pressure relief pipe. is seated on the valve seat to assemble the overpressure relief valve, the overpressure relief valve can be assembled with a simple operation. Further, since the convex portion of the biasing member retainer and the concave portion of the pressure relief pipe can be easily molded by molding, the parts cost can be reduced. In addition, since the position of the lock groove in the concave portion of the pressure relief pipe determines the pressure for urging the valve body, the valve body can be stably energized at a desired pressure, so that overpressure relief due to unintended pressure can be prevented. It can prevent the valve from working. In addition, since disassembly and assembly can be easily performed, maintainability can also be improved.

In the overpressure relief valve according to claim 2, an elastic member is adopted for the valve portion that is seated on the valve seat, and the valve portion is supported by a valve portion retainer made of a hard material such as metal or resin. The urging force of the member can be stably applied to the valve body, and the valve portion can be seated on the valve seat without a gap.

In the overpressure relief valve according to claim 3, since the rear portion of the valve portion retainer and the front portion of the biasing member retainer are inserted in the longitudinal direction of the coil spring, which is the biasing member, the position of the coil spring is stabilized. The biasing force of the coil spring can be stably applied to the valve body.

In the overpressure relief valve according to claim 4, the rear end surface of the urging member retainer is provided with a depressed portion that fits, for example, a hexagonal wrench, a flathead screwdriver, a Phillips screwdriver, etc., so that when the overpressure relief valve is assembled, There is no need to prepare special jigs. In addition, when assembling the overpressure relief valve, even if the urging member retainer gets into the pressure relief pipe, the overpressure relief valve can be easily disassembled and assembled using a hexagon wrench, flathead screwdriver, Phillips screwdriver, or the like.

In the overpressure relief valve according to claim 5, when the overpressure relief valve operates, the pressure released from the relief path formed in the side surface of the valve body can be released to the atmosphere through the communication hole provided in the biasing member retainer. Therefore, there is no need to provide an opening in the pressure relief pipe to release the pressure released from the relief path to the atmosphere.

In the overpressure relief valve according to claim 6, a wall for locking the projection of the biasing member retainer is provided in the lock groove of the recess of the pressure relief pipe, so that the projection of the biasing member retainer is positioned at an appropriate position. Since it can be held by the lock groove of the concave portion, the convex portion of the biasing member retainer can be stably held, and the convex portion of the biasing member retainer can be easily guided to an appropriate position in the lock groove of the concave portion. . This simplifies the assembly work of the overpressure relief valve and stabilizes the quality.

In the overpressure relief valve according to claim 7, the overpressure relief valve can When activated, the pressure can be smoothly released to the atmosphere through an opening, which is a lock groove provided on the side of the pressure relief pipe.

In the overpressure relief valve according to claim 8, by providing a plurality of lock grooves of recesses along the pressure relief pipe for engaging with the projections of the biasing member retainer to hold the biasing member, the biasing member retainer can change the position in the front-rear direction. Thereby, the pressure for urging the valve body can be adjusted without changing the urging force of the urging member.

In the overpressure relief valve according to claim 9, since the side surface of the valve body and the inner surface of the pressure relief pipe abut on the arc surface, the relief path is secured, and the device main body or the pipe in which the overpressure relief valve is installed. When the internal pressure exceeds a predetermined pressure, the valve body slides smoothly within the pressure relief pipe to release the pressure.

1 is a side perspective view of one embodiment of an overpressure relief valve in accordance with the present invention disposed in a main pipeline; FIG. 1 is a front perspective view of an embodiment of an overpressure relief valve according to the present invention arranged in a main pipe; FIG. FIG. 3 is a cross-section AA indicated in FIG. 2 of an overpressure relief valve located in the main pipe; Fig. 3 is a cross-sectional view of the overpressure relief valve located in the main pipe taken along the line BB indicated in Fig. 2; It is (A) a front view, (B) a side view, and (C) a top view of the piping part of the overpressure relief valve. (A) CC cross-sectional view, (B) DD cross-sectional view, (C) EE cross-sectional view, (D) FF cross-sectional view indicated in FIG. 5 of the piping part of the overpressure relief valve be. They are (A) the valve body which comprises an overpressure relief valve, (B) the front view of a spring retainer, a side view, and a rear view, (C) The front view and a side view of a spring. FIG. 8 is a diagram (Part 1) illustrating a procedure for assembling the valve body, the spring retainer, and the spring shown in FIG. 7 to the piping portion of the overpressure relief valve; FIG. 8 is a diagram (part 2) illustrating a procedure for assembling the valve body, the spring retainer and the spring shown in FIG. 7 to the piping portion of the overpressure relief valve; 8 is a diagram (part 3) illustrating a procedure for assembling the valve body, the spring retainer and the spring shown in FIG. 7 to the piping portion of the overpressure relief valve; FIG. It is a figure explaining operation|movement of an overpressure relief valve. FIG. 4 is a front view, a side view, a top view, and a sectional view at each position of an overpressure relief valve according to another embodiment of the present invention; FIG. 5 is a diagram illustrating a method for adjusting the pressure of an overpressure relief valve according to another embodiment of the present invention;

First, an overpressure relief valve 10, which is one embodiment of the present invention, will be described with reference to the drawings.

1 is a side perspective view of an overpressure relief valve 10 arranged in the main pipe 1, and FIG. 2 is a front perspective view of the overpressure relief valve 10 arranged in the main pipe 1. FIG. 3 is a cross-sectional view of the overpressure relief valve 10 arranged in the main pipe 1, indicated in FIG. 2, and FIG. FIG. 3 is a cross-sectional view along the line BB indicated in FIG. 2; In the embodiment, it is assumed that the main pipe 1 is connected to a water heater, a water storage tank, and the like (not shown).

As shown in FIGS. 1 to 4, the overpressure relief valve 10 includes an overpressure relief pipe 11 connected to the main pipe 1, a passage port 2 of the main pipe 1, and a relief passage port 12 of the overpressure relief pipe 11. a valve seat 14 provided in the opening 13; a valve body 17 seated on the valve seat 14; It is composed of a spring retainer 18 that supports a spring 19 and a lock groove 20 that retains the spring retainer 18 while the valve body 17 is biased. Since the overpressure relief valve 10 according to the present embodiment is configured inside the overpressure relief pipe 11 as described above, for example, other pipes or the like are connected to the outer peripheral surface of the overpressure relief pipe 11. ribs 23 can be provided circumferentially. Incidentally, the rib 23 is not necessarily provided, and may be provided as necessary.

FIG. 5(A) is a front view of the overpressure relief pipe 11 of the overpressure relief valve 10 as seen from the outlet side (where the spring retainer 18 is arranged), and FIG. 5(B) is a side view. FIG. 5C is a top view as seen from above.

Although the details will be described later, as shown in FIG. 5A, the outlet side of the overpressure relief pipe 11 is provided with a guide groove 21 that allows the spring retainer 18 to be inserted toward the opening 13. . 5B and 5C, lock grooves 20, 20 for holding the spring retainer 18 are provided on the left and right side surfaces of the overpressure relief pipe 11 and connected to the guide groove 21. It is

FIG. 6(A) is a CC sectional view of the piping portion of the overpressure relief valve indicated in FIG. 5(A), and FIG. 6(B) is indicated in FIG. 5(A). 6(C) is a EE cross-sectional view of the piping portion of the overpressure relief valve indicated in FIG. 5(B). 6(D) is a cross-sectional view taken along line FF of the piping portion of the overpressure relief valve indicated in FIG. 5(B).

As shown in FIG. 6 , the guide groove 21 extends in the vertical direction, has arcuate upper and lower end surfaces, and opens in the front-rear direction toward the opening 13 . The lock grooves 20 , 20 extend in a direction perpendicular to the guide groove 21 and are provided in connection with the guide groove 21 . That is, they are provided perpendicular to the longitudinal direction of the overpressure relief pipe 11, and the ends of the lock grooves 20, 20 penetrate the overpressure relief pipe 11 to form openings. As shown in FIGS. 5 and 6, the lock groove 20 has a lock groove rotating portion 20a that allows the spring retainer 18 to rotate freely at the position of the EE cross section, and a rotation of the spring retainer 18 at the position of the FF cross section. and a lock groove rotation restraining portion 20b for restraining the rotation. Although the details will be described later, the spring presser 18 is inserted along the guide groove 21 toward the opening 13, becomes rotatable in the lock groove rotation portion 20a, and is held in the lock groove rotation restraint portion 20b. The restricting wall 21a is provided to restrict the rotation of the spring retainer 18. As shown in FIG.

FIG. 7 is a diagram showing the valve body 17, the spring retainer 18 and the spring 19 that constitute the overpressure relief valve. 7A shows, from the left, a front view, a side view, and a rear view of the valve body 17. FIG. 7B shows, from the left, a front view, a side view, and a rear view of the spring retainer 18. FIG. 7C shows, from the left, a front view and a side view of the spring 19. FIG.

As shown in FIG. 7A, in this embodiment, the valve body 17 is formed of a cylindrical valve member 15 made of an elastic member such as fluororubber and a hard resin member such as polyphenylene sulfide (PPS). and a valve member retainer 16. The valve member 15 is housed in a recessed valve member housing portion 16f formed on the rear surface of the valve member retainer 16, and is integrated with the valve member retainer 16 to form the valve body 17. As shown in FIG. When the overpressure relief valve 10 is closed, the valve member 15 is seated on the valve seat 14 provided in the opening 13 . In this manner, by using an elastic member such as the valve member 15 in the portion that is seated on the valve seat 14 and supporting the valve member 15 with the valve member retainer 16 that is a hard member, the valve body 17 is placed against the valve seat 14. In addition, the biasing force of the spring 19 can be stably received.

The valve member retainer 16 consists of a columnar valve member retainer body 16a extending rightward and a columnar spring support portion 16b extending leftward in a side view. It is smaller than the inner diameter M of the spring 19 shown in (C), and the spring 19 can pass through it. Further, four ribs 16e, 16e, 16e, 16e, which have an arcuate outer surface and extend left and right in a side view, are provided on the outer circumference of the side surface of the valve member holding body 16a at approximately equal intervals. The arcuate outer surface of the rib 16e is designed to abut against the inner surface of the relief passage port 12 of the overpressure relief pipe 11, and the inner surface of the relief passage port 12 formed by the rib 16e and the valve member pressing body 16a are aligned. An overpressure relief path 22 is provided by the gap between . In this way, since the side surface of the valve body 17 and the inner surface of the relief passage port 12 of the pressure relief pipe 11 are brought into contact with the arc surface, the relief passage port 12 is secured and the main pressure relief valve 10 is connected. When the internal pressure of the pipe 1 exceeds a predetermined pressure, the valve body 17 slides smoothly to release the pressure. Here, in this embodiment, four ribs 16e are provided on the outer periphery of the side surface of the valve member holding body 16a at regular intervals, but the present invention is not limited to this. If they can slide smoothly, they do not necessarily need to be provided at regular intervals. In addition, although the rib 16e is used to form the overpressure relief passage 22, the formation of the overpressure relief passage 22 is not limited to this. may

As shown in FIG. 7B, the spring retainer 18 includes, in a side view, a columnar spring retainer body 18a extending leftward, a columnar spring support portion 18b extending rightward, and a spring retainer body 18a. The diameter of the spring support portion 18b is smaller than the inner diameter M of the spring 19 shown in FIG. ing. Also, in the side view, a through hole 18d penetrating in the left-right direction is provided in the central portion. A depressed portion 18e having a substantially regular hexagonal prism shape is provided on the front side of the spring retainer main body 18a. In this embodiment, the depressed portion 18e is provided so as to fit with a predetermined hexagonal wrench. Therefore, when assembling the overpressure relief valve 10, there is no need to prepare a special jig. In addition, even if the biasing member retainer gets into the pressure relief pipe more than necessary when assembling the overpressure relief valve, the overpressure relief valve 10 can be easily disassembled and assembled using a hexagonal wrench. The depressed portion 18e is not limited to a substantially regular hexagonal prism shape that fits with a hexagonal wrench as in the present embodiment, and may be provided in a shape that fits with a Phillips screwdriver or a flat-blade screwdriver, for example. .

As shown in FIG. 7C, the spring 19 is a cylindrical coil spring in this embodiment. The outer diameter L of the spring 19 is smaller than the inner diameter of the relief passage port 12 of the pressure relief pipe 11, and the inner diameter M is the same as the spring support portion 16b of the valve member retainer 16 or the spring support portion 18b of the spring retainer 18, as described above. is set to have a diameter that can be penetrated.

Next, a method of assembling the overpressure relief valve 10 will be described with reference to the drawings.

8, 9 and 10 are diagrams for explaining the procedure for assembling the overpressure relief valve 10. FIG. First, as shown in FIGS. 8A and 8B, the spring support portion 18b of the spring retainer 18 is attached from the left side of the drawing, and the valve body 17 (valve member retainer 16) is attached from the right side. Spring support 16 b is inserted into spring 19 . Then, as shown in FIG. 8C, the valve body 17 and the spring retainer 18 are inserted into the pressure relief pipe 11 into the relief passage port 12 in a state where the spring 19 is inserted. Since the spring support portion 18b of the spring retainer 18 and the spring support portion 16b of the valve body 17 are inserted into the spring 19 to assemble the overpressure relief valve 10, the spring 19 is attached to the valve body 17 and the spring retainer. 18 can be stably energized.

9 and 10(A), the valve body 17 and the spring retainer 18 are inserted into the spring 19, and the overpressure relief valve 10 is inserted into the relief passage port 12 of the pressure relief pipe 11. It is the figure which looked at a mode that it assembled|attached from upper direction. FIG. 10B is a side view of how the overpressure relief valve 10 is assembled. In FIG. 10A, out of the valve body 17, the spring 19, and the spring retainer 18, after the valve body 17 and the spring 19 are inserted, the guide portions 18c, 18c of the spring retainer 18 are fitted into the guide groove 21. while being inserted into the pressure relief pipe 11 . Then, as shown in FIG. 9A, the valve body 17 is seated on the valve seat 14 provided in the opening 13 . Then, as shown by arrow (1) in FIG. 9A, the spring retainer 18 is further pushed in against the biasing force of the spring 19, and as shown in FIG. 9B, the spring retainer 18 is released. When the guide portions 18c, 18c are pushed to the position of the EE cross section, the spring retainer 18 is rotatable by the lock groove rotating portion 20a of the lock groove 20, as described above.

Here, the spring retainer 18 is rotated as indicated by arrow (2) in FIG. Then, using the biasing force of the spring 19, the spring retainer 18 is moved slightly forward (to the left in the drawing) as indicated by arrow (1) in FIG. By arranging the guide portions 18c, 18c of the spring retainer 18 in the lock groove rotation restraining portion 20b of the lock groove 20, as shown in the side view of FIG. Rotation is restrained and held by the biasing force of the spring 19 . Thus, the overpressure relief valve 10 can be assembled. As described above, the guide groove 21 is provided with the regulation wall 21a. When the guide portions 18c, 18c of the spring retainer 18 are moved to the position of the lock groove 20 by rotating the spring retainer 18, the spring retainer 18 is held at the position of the lock groove rotation restraining portion 20b of the lock groove 20 by the restricting wall 21a. Rotation can be locked. As a result, the valve body 17, the spring 19, and the spring retainer 18 can be easily assembled to the pressure relief pipe 11 because they can be assembled without excessive rotation.

The operation of the overpressure relief valve 10 assembled as described above will now be described with reference to FIG.

FIG. 11A is a diagram showing the state of the overpressure relief valve 10 when the internal pressure of the main pipe 1 to which the overpressure relief valve 10 is connected is normal, and FIG. 1 is a diagram showing the state of the overpressure relief valve 10 when the internal pressure of 1 exceeds a predetermined pressure (in the case of abnormal pressure).

When the internal pressure of the main pipe 1 is normal (lower than a predetermined pressure) as indicated by arrow (1) in FIG. It is seated on a valve seat 14 provided in the opening 13 to be in a closed state. When the internal pressure of the main pipe 1 exceeds a predetermined pressure as indicated by the arrow (2) in FIG. 11B, the valve body 17 resists the biasing force of the spring 19 as indicated by the arrow (3). to move in the direction of the spring retainer 18. Then, the valve body 17 is separated from the valve seat 14, and the internal pressure of the main pipe 1 is released from the opening 13 through the overpressure relief passage 22 and the lock groove 20 of the pressure relief pipe 11, as indicated by the arrow (4). It is possible to prevent damage to the main pipe 1 and a water heater (not shown) connected to the main pipe 1 by releasing the air to the atmosphere through the through hole 18d passing through the central portion of the spring retainer 18.

Furthermore, according to the overpressure relief valve 10 of the present embodiment, the position of the spring retainer 18 can be stably held at the position of the lock groove 20, so that the biasing force of the spring 19 on the valve body 17 is a desired value. The pressure can stably bias the valve body 17 . Therefore, it is possible to prevent the overpressure relief valve 10 from operating due to unintended pressure.

Moreover, according to the overpressure relief valve 10 of the present embodiment, as described above, it is possible to easily assemble and disassemble the overpressure relief valve.

Here, the overpressure relief valve 10 is an example of an overpressure relief valve, the valve seat 14 is an example of a valve seat, the valve body 17 is an example of a valve body, and the valve member 15 is an example of a valve portion. , the valve member retainer 16 is an example of a valve portion retainer, the spring retainer 18 is an example of a biasing member retainer, the guide portion 18c is an example of a convex portion, and the spring 19 is an example of a biasing member or coil spring. , the recessed portion 18e is an example of a recessed portion, the lock groove 20 is an example of a lock groove, the guide groove 21 is an example of a guide groove, and the overpressure relief path 22 is an example of a relief path.

Although the embodiments of the present invention have been described in detail above, these are only examples, and the present invention is not to be construed in any limited way by the specific descriptions in such embodiments. It can be implemented in embodiments with various changes, modifications, improvements, etc. based on knowledge, and as long as such embodiments do not depart from the spirit of the present invention, all are within the scope of the present invention. should be understood to be included in the

For example, in the above embodiment, a lock groove is provided at one position along the pressure relief pipe 11, like the lock groove 20, but the lock groove is not limited to this, and other implementations shown in FIG. As in some embodiments, the locking grooves 34 and 35 may be provided at two different locations along the pressure relief line 11 . In this case, the lock groove 34 and the lock groove 35 are connected by the guide groove 33 as shown in (C) to (G) of FIG. 12 .

Thus, according to the overpressure relief valve 30 according to another embodiment, when the spring retainer 36 is rotated in the direction of the arrow (1) in FIG. 13 at the position of the bb cross section of FIG. , the guide portion 36a of the spring retainer 36 is held by the lock groove 34, and further, the spring retainer 36 is pushed in and moved in the direction of the arrow (2) in FIG. 36 is rotated, the guide portion 36a of the spring retainer 36 is held by the lock groove 35. As shown in FIG. In this way, by providing a plurality of lock grooves connected to the guide grooves along the pressure relief pipe 11, it is possible to adjust the biasing force of the spring 19 applied to the valve body 17, and overpressure relief can be performed at different pressures. Valve 30 can also be actuated. Needless to say, it is possible to provide three or more lock groove positions.

Further, in the above embodiment, the lock grooves 20 or 34, 35 are openings passing through the pressure relief pipe 11. As shown in FIG. However, as in the above-described embodiment, if an opening to the atmosphere such as the through hole 18d penetrating the center portion of the spring retainer 18 is provided, the lock groove does not necessarily have to be an opening. Conversely, by using the lock grooves 20 or 34, 35 as openings as in the above embodiment, the through hole (16b) passing through the central portion of the spring retainer 18 or 36 is not necessarily required.

In the above-described embodiment, the lock groove 20 is composed of the lock groove rotation portion 20a that allows the spring retainer 18 to rotate freely and the lock groove rotation restraint portion 20b that restrains the rotation of the spring retainer 18. Since it is biased by the spring 19, the lock groove rotation restraining portion 20b is not necessarily required.

REFERENCE SIGNS LIST 1 main pipe 2 flow path port 10 overpressure relief valve 11 pressure relief pipe 12 relief flow path port 13 opening 14 valve seat 17 valve body 18 spring retainer 19 Spring 20 Lock groove 21 Guide groove 22 Overpressure relief path

Claims (9)

a valve seat provided in a pressure relief passage within the pressure relief pipe;
a valve body seated on the valve seat;
a biasing member that biases the valve body in a direction to seat it on the valve seat;
a biasing member retainer arranged to face the valve body and supporting the biasing member;
An overpressure relief valve comprising a relief passage formed on the side surface of the valve body,
a convex portion provided on the rear side surface of the biasing member retainer, and a concave portion provided on the inner side surface of the rear end portion of the pressure relief pipe and fitted with the convex portion,
the recess comprises a guide groove and a lock groove connected to the guide groove,
An overpressure relief valve, wherein the projection of the biasing member retainer is fitted into the lock groove of the recess of the pressure relief pipe to retain the biasing member retainer. 2. The valve body according to claim 1, wherein the valve body comprises a valve portion which is formed of an elastic member and which is seated on the valve seat, and a valve portion retainer which is formed of a hard member and supports the valve portion. Overpressure relief valve as described. The biasing member is a columnar coil spring, and the rear portion of the valve portion retainer and the front portion of the biasing member retainer are formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the coil spring. 3. The overpressure relief valve according to claim 2 , wherein said rear portion of said biasing member retainer and said front portion of said biasing member retainer face each other and hold said biasing member retainer in a state of being inserted into said coil spring. 4. An overpressure relief according to any one of claims 1 to 3, characterized in that the rear end surface of said urging member retainer is provided with a recess for fitting a hexagon wrench, a flathead screwdriver, or a Phillips screwdriver. valve. The urging member retainer is provided with a communication hole penetrating in the axial direction. 5. The overpressure relief valve according to any one of claims 1 to 4, wherein the pressure relief valve One end of the lock groove of the recess is connected to the guide groove, and the other end is provided with a wall for locking the projection of the urging member retainer. 6. The overpressure relief valve according to any one of items 1 to 5. 7. The pressure relief tube according to any one of claims 1 to 6, wherein the lock groove of the recess provided on the inner surface of the pressure relief pipe is an opening penetrating the side surface of the pressure relief pipe. pressure relief valve. A plurality of the lock grooves of the concave portion provided on the inner surface of the pressure relief pipe are provided along the pressure relief pipe, and the lock grooves are connected by a connection groove that fits with the protrusion of the biasing member retainer. 8. The overpressure relief valve according to any one of claims 1 to 7, characterized in that On the outer peripheral surface of the side surface of the valve body, at least three semicylindrical projections having an arcuate outer periphery are provided at approximately equal intervals to contact the inner surface of the pressure relief pipe,
9. The method according to any one of claims 1 to 8, wherein the relief path is formed by a gap between the inner surface of the pressure relief pipe and the outer peripheral surface of the valve body, which is generated by the semi-cylindrical protrusion. Overpressure relief valve as described.

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