JP2016138567A - Atmosphere release valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and low-cost pressure receiving structure of an atmosphere release valve.SOLUTION: A valve element 24 is arranged in a space communicated with a discharge pipe 40, and can come into contact with and separate from a valve seat 60. A diaphragm 22 has a first pressure receiving surface 70 facing an introduction pipe 48 and receiving a primary pressure P1, and a second pressure receiving surface 72 facing a discharge pipe 40 and receiving an atmospheric pressure P0, and receives a differential pressure (P1-P0) in a radially outward direction of the valve element 24 during the valve closing time. A supporting part 74 supporting the diaphragm 22 from the radial direction outer side at least during the valve closing time and receiving the force by the differential pressure (P1-P0) through the diaphragm 22 in such a manner that the pressure receiving force is larger in the valve closing time than in the valve opening time is provided on a body 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an air release valve, and more particularly to an air release valve that is disposed in a hot water supply system and is suitable for preventing a back flow of hot water from a bathtub to a water supply side.

  In the hot water supply system, for example, a solenoid valve, a first check valve, an air release valve, and a second check valve are provided on the pipe connecting the hot water supply device and the bathtub from the upstream side. The solenoid valve allows or blocks the supply of hot water from the hot water supply device to the bathtub by opening and closing its piping. The two check valves ensure the prevention of back flow of hot water from the bathtub to the hot water supply device side. The atmosphere release valve opens the space between the two check valves to the atmosphere in response to a decrease in pressure (primary pressure) upstream of the solenoid valve.

  For example, when the bathtub is installed at a position higher than the hot water supply device, if the second check valve has a poor watertightness due to the biting of foreign matter, etc., the sewage in the bathtub is released to the atmosphere by the water head pressure. It flows backward to the valve. In particular, when the primary pressure becomes negative due to water interruption or power failure, the backflow is promoted. Even in such a case, the sewage is discharged to the atmosphere by the air release valve, and further, the backflow prevention action by the first check valve is exerted. Therefore, it is possible to prevent the water from flowing back to the hot water supply apparatus and thus the water supply. . Such an air release valve opens and closes according to the relationship between the pressure upstream of the solenoid valve (primary pressure) and the pressure downstream of the solenoid valve (secondary pressure).

  As such an air release valve, it has a bellowram type diaphragm with a deep turn-back part, receives a primary pressure at one pressure receiving surface, receives a secondary pressure at the other pressure receiving surface, and by the differential pressure between them There is one that drives a valve body (see, for example, Patent Document 1). This diaphragm has a thick portion that constitutes a seal portion of the valve body and is attached to and detached from the valve seat, and a thin portion that supports the thick portion in a displaceable manner. However, since such a diaphragm is a thin film as a whole, the strength against the above-mentioned differential pressure must be ensured. Therefore, measures have been taken such as embedding a base cloth in rubber which is a material of such a diaphragm to enhance pressure resistance, or assembling an annular cover member so as to protect the diaphragm from the outside.

JP 2005-61639 A

  However, the above-mentioned diaphragm with a base fabric is generally expensive. In addition, the use of the cover member leads to an increase in the number of parts. For this reason, in any case, there is a problem that it is disadvantageous in terms of cost.

  The present invention has been made in view of such problems, and one of its purposes is to provide a pressure receiving structure for an air release valve simply and at low cost.

  An aspect of the present invention is applied to a hot water supply system that includes a pipe that connects a hot water supply device and a bathtub, and a control valve that is provided in the pipe and can allow or block the flow of hot water, and is upstream of the control valve. Receives the differential pressure between the primary pressure, which is the pressure, and the secondary pressure, which is the pressure downstream of the control valve, and opens the part downstream of the control valve of the piping to the atmosphere in response to the drop in the primary pressure. It is an atmospheric release valve. The air release valve includes a body having a first introduction pipe portion to which a primary pressure is introduced, a second introduction pipe portion to which a secondary pressure is introduced, and a discharge pipe portion that is opened to the atmosphere, and a second introduction pipe A valve seat provided in a passage communicating the pipe portion and the discharge pipe portion, a valve body that is attached to and detached from the valve seat to open and close the passage, and a passage and the first introduction pipe portion are fixed in the body. A diaphragm that holds the valve body so as to keep the passage closed when the primary pressure is not lowered, and that can be displaced integrally with the valve body in a direction in which the passage opens in response to a drop in the primary pressure. .

  The diaphragm has a first pressure receiving surface that receives the primary pressure and a second pressure receiving surface that receives the secondary pressure or the atmospheric pressure, and receives a differential pressure outward in the radial direction of the valve body when the valve is closed. Provided. The body is provided with a support portion that supports the diaphragm from the outside in the radial direction at least when the valve is closed, receives a force due to the differential pressure through the diaphragm, and receives the pressure when the valve is closed larger than when the valve is opened. It is done.

  According to this aspect, even when the diaphragm attempts to expand in the radial direction due to the differential pressure between the primary pressure and the secondary pressure or the atmospheric pressure when the valve is closed, the support portion provided on the outside receives the diaphragm and deforms it. To regulate. For this reason, even if the diaphragm is not provided with a reinforcing member such as a base fabric, it is possible to prevent damage due to the deformation. There is no need to provide another member for preventing deformation. As a result, the pressure receiving structure of the air release valve can be provided simply and at low cost.

  Another embodiment of the present invention is also an air release valve. The diaphragm of the air release valve includes a thick part that is attached to and detached from the valve seat as a part of the valve body, and a thin part that is provided integrally with the thick part and is deformable in the axial direction of the valve body. The thick portion is configured to overhang outward in the radial direction of the valve seat and to receive a differential pressure in the axial direction at the overhanging portion. The body is provided with a receiving surface capable of receiving the thick portion outside the valve seat when the valve is closed.

  According to this aspect, the thick wall portion of the diaphragm is provided so as to overhang outward in the radial direction of the valve seat, so that the sealing performance when the valve is closed can be maintained high. In such a configuration, since the differential pressure between the primary pressure and the secondary pressure or atmospheric pressure acts on the overhang portion, the portion is easily deformed. Receive the overhang part. For this reason, even if a reinforcing member such as a base fabric is not provided on the diaphragm, damage due to deformation of the thick portion can be prevented. There is no need to provide another member for preventing deformation. As a result, the pressure receiving structure of the air release valve can be provided simply and at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, the pressure receiving structure of an air release valve can be provided simply and at low cost.

It is a figure showing the composition of the hot-water supply system to which the atmosphere release valve concerning an embodiment is applied. It is a side view showing the structure of an air release valve. It is AA arrow sectional drawing of FIG. It is the elements on larger scale showing composition and operation near the principal part. It is a top view of the 1st body containing a principal part. It is the elements on larger scale showing the structure of a comparative example. It is the elements on larger scale showing the structure of the principal part vicinity of the air release valve which concerns on another modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed as upper and lower with reference to the illustrated state. Drawing 1 is a figure showing the composition of the hot-water supply system to which the atmosphere release valve concerning an embodiment is applied.

  In this hot water supply system, water supplied from the water supply is supplied via the water supply pipe 1. The water supply pipe 1 branches on the downstream side of the flow sensor 2, one of which is connected to the heat exchanger 3 and the other is connected to the bypass valve 4. A part of the water supplied through the water supply pipe 1 is heated in the process of passing through the heat exchanger 3 and is mixed and mixed downstream with the water through the bypass valve 4. By controlling the opening degree of the bypass valve 4, the mixing ratio of the hot and cold water is adjusted. The hot water adjusted to an appropriate temperature in this way is further supplied with hot water via the hot water supply pipe 6 with the hot water flow rate controlled by the regulating valve 5. The hot water supply pipe 6 is further branched into a pipe 7 and a pipe 8 on the downstream side. The pipe 7 is connected to the bathtub 10 and the pipe 8 is connected to hot water supply equipment such as currant.

  A flow rate sensor 12, a solenoid valve 14, and check valves 16 and 18 are arranged in series on the pipe 7 from the upstream side. The electromagnetic valve 14 functions as a “control valve” that allows or blocks the supply of hot water from the hot water supply device including the heat exchanger 3 to the bathtub 10. The check valve 16 functions as a “first check valve”, and the check valve 18 functions as a “second check valve”. An air release valve 20 is connected between the check valve 16 and the check valve 18 via a lead-out pipe 19. As will be described later, the air release valve 20 has a valve body 24 that is integral with a diaphragm 22, and is partitioned into three pressure chambers 26, 27, and 28 by the diaphragm 22 when the valve is closed. The pressure chamber 26 communicates with the pipe 7 via the lead-out pipe 19, and a secondary pressure P 2 that is a pressure on the downstream side of the electromagnetic valve 14 is introduced. The pressure chamber 27 communicates with the upstream side of the flow rate sensor 12 in the pipe 7 via the introduction pipe 29, and a primary pressure P <b> 1 that is a pressure upstream of the electromagnetic valve 14 is introduced. The pressure chamber 28 is opened to the atmosphere, and becomes the atmospheric pressure P0 when the valve is closed. The air release valve 20 operates by receiving a differential pressure between the primary pressure P1 and the secondary pressure P2, and opens in response to a decrease in the primary pressure P1. Thereby, the part in the downstream of the solenoid valve 14 in the pipe 7 is opened to the atmosphere.

  Next, the overall configuration and operation of the atmosphere release valve 20 will be described. FIG. 2 is a side view illustrating the configuration of the atmosphere release valve 20. 3 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 2, the air release valve 20 has a body 30 that opens in three directions, and a valve portion is provided at the center of the inside thereof. The body 30 is configured by assembling a first body 32 and a second body 34.

  As shown in FIG. 3, the first body 32 includes a stepped cylindrical main body 36 whose diameter is gradually reduced downward. The lower half part of the main body 36 is an introduction pipe part 38 (functioning as a “second introduction pipe part”) connected to the outlet pipe 19 and introduced with the secondary pressure P2. A discharge pipe portion 40 is provided so as to extend laterally from the upper half portion of the main body 36. The discharge pipe part 40 is opened to the atmosphere. The introduction pipe part 38 and the discharge pipe part 40 are orthogonal to each other. A spring receiver 42 is provided so as to be supported on the inner wall of the introduction pipe portion 38. The spring receiver 42 has a cylindrical shaft core portion 44 provided concentrically with the introduction tube portion 38, and a plurality of support portions 46 that support the shaft core portion 44 in the radial direction (see FIG. 5).

  The second body 34 has a stepped cylindrical main body 47 whose diameter is reduced upward. The upper half of the main body 47 is an introduction pipe part 48 (functioning as a “first introduction pipe part”) connected to the introduction pipe 29 and introduced with P1. The introduction pipe portion 48 is provided coaxially with the introduction pipe portion 38. A valve chamber 50 is formed by a space surrounded by the upper half portion of the first body 32 and the lower half portion of the second body 34, and the valve body 24 is disposed in the valve chamber 50.

  The valve body 24 is formed so as to fit the disc-shaped main body 52 and the thick portion 54 of the diaphragm 22. That is, the diaphragm 22 is in the form of a deep bellows with a folded portion, and the thick portion 54 at the center thereof constitutes a part of the valve body 24. The diaphragm 22 is fixedly supported by the body 30 such that the peripheral edge is sandwiched between the first body 32 and the second body 34. The valve body 24 is coaxially supported at the center of the diaphragm 22. Due to the deformation of the thin portion 56 of the diaphragm 22, the valve body 24 can be displaced along its axis. The main body 52 is provided with a locking portion 53 that extends to the opposite side of the thick portion 54. When the valve is opened, the locking portion 53 is locked to the second body 34, whereby the displacement of the valve body 24 (that is, the valve opening) is regulated (see FIG. 4B).

  A circular boss-shaped partition wall 58 projects from the introduction pipe portion 38 into the valve chamber 50, and a valve seat 60 is formed at the upper end opening thereof. That is, the valve seat 60 is provided in the discharge passage 62 that communicates the introduction pipe portion 38 and the discharge pipe portion 40. When the valve body 24 (more precisely, the thick wall portion 54) is attached to and detached from the valve seat 60, the valve portion and thus the discharge passage 62 is opened and closed. The valve body 24 and the diaphragm 22 are provided so as to partition the discharge passage 62 and the pressure chamber 27. A spring 64 for biasing the valve body 24 in the valve opening direction is interposed between the valve body 24 and the spring receiver 42. The diaphragm 22 holds the valve body 24 so as to keep the discharge passage 62 closed in a normal state where the primary pressure P1 does not decrease, and the valve 22 opens in response to the decrease in the primary pressure P1. It is displaced integrally with the body 24.

  Returning to FIG. 1, in the hot water supply system configured as described above, when performing hot water filling or subsequent pouring of the bathtub 10, the electromagnetic valve 14 is opened. Thereby, the hot water that has passed through the regulating valve 5 is supplied to the bathtub 10 via the flow rate sensor 12, the electromagnetic valve 14, and the check valves 16 and 18. At this time, the primary pressure P <b> 1 is introduced into the atmosphere release valve 20 through the introduction pipe 29. Since the primary pressure P1 is usually higher than the secondary pressure P2, the air release valve 20 maintains the closed state. However, if a negative pressure is generated in the water supply pipe 1 due to a pump that pumps up water due to a power failure or a water outage, etc., the air release valve 20 detects a decrease in the primary pressure P1 and opens. And discharge downstream water to the atmosphere. At this time, if the check valve 18 has a poor watertightness due to a foreign matter or the like, the sewage in the bathtub 10 flows back to the atmosphere release valve 20 through the check valve 18 due to the water head pressure. Come. However, the sewage is discharged to the atmosphere by the atmosphere release valve 20 and further the backflow prevention action by the check valve 16 is exhibited, so that it does not flow back to the hot water supply pipe 6.

  Next, the configuration and operation of the main part of the atmosphere release valve 20 will be described in detail. FIG. 4 is a partially enlarged view showing the configuration and operation in the vicinity of the main part. (A) shows a valve closing state, and (B) shows a valve opening state. FIG. 5 is a plan view of the first body 32 including the main part. (A) shows the configuration of the embodiment, and (B) shows the configuration of the modification. FIG. 6 is a partially enlarged view showing the configuration of the comparative example. (A) shows the configuration of the first comparative example, and (B) shows the configuration of the second comparative example.

  As shown in FIG. 4A, the diaphragm 22 has a first pressure receiving surface 70 that faces the introduction pipe portion 48 and receives the primary pressure P1, and a first pressure receiving surface 70 that faces the discharge pipe portion 40 and receives the atmospheric pressure P0. 2 pressure receiving surfaces 72. Therefore, the diaphragm 22 receives a radially outward differential pressure (P1-P0) when the valve is closed. That is, a force in the direction of expanding outward in the radial direction acts on the diaphragm 22.

  Therefore, in the present embodiment, an annular support portion 74 that faces the side surface of the diaphragm 22 is provided on the first body 32 so as to suppress this swelling. As shown in FIG. 2, the support portion 74 is provided so as to partially overlap the cross section of the conduit in the discharge pipe portion 40. Moreover, the support part 74 is provided so that it may approach the valve seat 60 rather than the thin part 56 regarding the axial direction. With this configuration, the valve body 24 can be positioned inside the first body 32. As a result, the body 30 can be downsized while maintaining the stroke of the valve body 24.

  With this configuration, when the valve is closed as shown in FIG. 4A, the support portion 74 supports the diaphragm 22 from the outside in the radial direction, and receives the force due to the differential pressure (P1−P0) through the diaphragm 22. . Thereby, the expansion of the diaphragm 22 to the radially outer side can be restricted, and in particular, excessive tensile stress can be prevented from acting on the thin portion 56.

  On the other hand, when the valve is opened as shown in FIG. 4B, the primary pressure P1 is low, so that no outward force is applied to the diaphragm 22 in the radial direction. As shown in the drawing, the support portion 74 is separated from the diaphragm 22. For this reason, a sliding resistance that prevents the valve opening between the diaphragm 22 and the support portion 74 does not occur. At this time, the inner peripheral surface of the thin portion 56 is supported by the main body 52. That is, according to such a configuration, it is possible to prevent damage due to deformation of the diaphragm 22 while maintaining the valve opening characteristics.

  In addition, as shown in FIG. 4A, in this embodiment, the thick wall portion 54 of the diaphragm 22 is provided so as to overhang radially outward of the valve seat 60, thereby improving the sealing performance when the valve is closed. To keep it high. In such a configuration, since the differential pressure between the primary pressure P1 and the atmospheric pressure P0 acts on the overhang portion, the portion is easily deformed.

  Therefore, the first body 32 is provided with a receiving surface 80 that can receive the thick portion 54 in the axial direction outside the valve seat 60 when the valve is closed. As shown in FIG. 5A, the receiving surface 80 is formed so as to be annularly connected except for a part on the discharge pipe portion 40 side. Thereby, the area which can support the thick part 54 is enlarged. However, as shown in FIG. 4A, there is a minute step between the valve seat 60 and the receiving surface 80, and the receiving surface 80 is located on the side farther from the valve body 24 in the axial direction than the valve seat 60. To do. Thereby, the adhesion (that is, the sealing performance of the valve portion) of the thick portion 54 to the valve seat 60 when the valve is closed is not hindered by the presence of the receiving surface 80. That is, the receiving surface 80 is provided so as to be able to come into contact with the thick portion 54 when the valve is closed, so that the support function can be secured, and the sealing performance of the valve portion can be improved by being formed at a position one step down from the valve seat 60. It is formed at a position where it can be secured. With the configuration as described above, according to the present embodiment, it is possible to suppress unnecessary deformation of the diaphragm 22 at the time of valve closing while maintaining the valve opening characteristics and the sealing performance of the valve portion satisfactorily.

  On the other hand, in the first comparative example shown in FIG. 6A, the first body 232 is not provided with the support portion 74 as in the present embodiment. For this reason, the diaphragm 22 may bulge outward in the radial direction due to the differential pressure (P 1 -P 0), and local deformation may occur in the thin portion 56. Specifically, for example, as shown in the figure, the edge of the inner opening end of the discharge pipe portion 40 may bite into the thin portion 56 and damage the thin portion 56 due to stress concentration. In this regard, according to the present embodiment, the thin portion 56 is protected by the support portion 74 as shown in FIG. 4A, so that such a problem does not occur.

  In the second comparative example shown in FIG. 6B, an annular cover 310 is attached to protect the valve body 24 from the outside in order to prevent the diaphragm 22 from bulging. The cover 310 slides with respect to the first body 332 and is displaced integrally with the valve body 24. With such a configuration, the problem as in the first comparative example can be avoided. However, provision of 310 may increase the number of parts and lead to an increase in cost. In this regard, in the present embodiment, since the support portion 74 is formed at the stage of forming the first body 32, there is no increase in the number of parts with respect to the valve body 24.

  That is, according to the present embodiment, by providing the support portion 74 and the receiving surface 80, deformation of the diaphragm 22 can be suppressed and its pressure resistance can be improved. For this reason, even if the diaphragm 22 is not provided with a reinforcing member such as a base fabric, damage due to the deformation can be prevented. Further, it is not necessary to provide another member for preventing deformation. As a result, the pressure receiving structure of the atmosphere release valve 20 can be provided simply and at low cost.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  For example, as shown in FIG. 5B, a plurality of receiving surfaces 180 arranged in an annular shape may be provided instead of the receiving surface 80 of the above embodiment. These receiving surfaces 180 are provided so as to protrude radially inward from the inner wall of the first body 132. Even with such a configuration, it is possible to suppress unnecessary deformation of the diaphragm 22 when the valve is closed.

FIG. 7 is a partially enlarged view showing a configuration in the vicinity of a main part of an air release valve according to another modification. (A) shows a valve closing state, and (B) shows a state immediately before valve opening.
As shown in FIG. 7A, in this modification, the positional relationship of the discharge pipe portion 440 with respect to the introduction pipe portion 48 is different from that in the above embodiment. That is, the discharge pipe part 440 is located on the side away from the introduction pipe part 48 as compared with the discharge pipe part 40 of the above embodiment. As a result, as shown in the figure, the support portion 74 can be provided as the opening end of the discharge pipe portion 440.

  Also in this modified example, when the valve is closed as shown in FIG. 7A, the support portion 74 supports the diaphragm 22 from the outside in the radial direction. Thereby, the expansion of the diaphragm 22 to the radially outer side can be restricted. On the other hand, when the valve is opened as shown in FIG. 7B, the primary pressure P <b> 1 is low, so that the support portion 74 is separated from the diaphragm 22. According to such a configuration, it is possible to prevent damage due to deformation of the diaphragm 22 while maintaining the valve opening characteristics.

  According to this modification, since it is not necessary to overlap the support part 74 with the cross section of the pipe line of the discharge pipe part 440, the piping shape of the first body 432 is simplified, and the processing cost can be reduced. Become. However, by positioning the discharge pipe part 440 on the side away from the introduction pipe part 48, the entire body may become larger in the axial direction of the introduction pipe part 48. In other words, according to the above embodiment, the entire body can be configured compactly.

  In the said embodiment, as shown to FIG. 4 (B), the structure which the diaphragm 22 spaces apart from the support part 74 at the time of valve opening was shown. In the modified example, even when the diaphragm 22 is not separated from the support portion 74 when the valve is opened, the adhesion force of the diaphragm 22 to the support portion 74 may be reduced. That is, the support part 74 should just be comprised so that the force by differential pressure | voltage (P1-P0) may be received via the diaphragm 22 at the time of valve closing, and the receiving pressure may become smaller than the time of valve closing at the time of valve opening. . In other words, the influence of the differential pressure (P1-P0) acting on the diaphragm 22 may be reduced by increasing the pressure received by the support portion 74 when the valve is closed.

  In the above embodiment, the introduction pipe part 48 (first introduction pipe part) and the introduction pipe part 38 (second introduction pipe part) are provided coaxially, and the discharge pipe part 40 is connected at right angles to them. Indicated. In the modification, for example, the positions of the introduction pipe part 38 and the discharge pipe part 40 may be interchanged. That is, the first introduction pipe part and the discharge pipe part may be provided coaxially, and the second introduction pipe part may be connected (perpendicularly) so as to intersect with them. And you may provide a valve seat in the opening end of a discharge pipe part. Specifically, the pipe part 40 in FIG. 3 may be connected to the upstream side of the solenoid valve 14 in the pipe 7 to introduce the primary pressure P1, and the pipe part 38 may be opened to the atmosphere.

  Although the example which employ | adopts the solenoid valve 14 as a control valve of this invention was shown in the said embodiment, you may employ | adopt other control valves which can open and close the piping 7, such as a motor drive electric valve, for example. A flow rate adjustment valve capable of adjusting the flow rate of hot water flowing through the pipe 7 may be adopted.

  In the embodiment described above, the introduction pipe portion 38 is connected to the pipe 7 via the outlet pipe 19, and the introduction pipe portion 48 is connected to the pipe 7 via the introduction pipe 29. Such a configuration can be realized by individually configuring the components of the solenoid valve 14, the check valve 16, the check valve 18, and the atmosphere release valve 20, and connecting them by piping. It is good also as a unit which attached either to a common body. Or it is good also as a unit which assembled | attached all those components integrally. The “pipe” can be interpreted as a concept including not only a tubular member but also a “pipe” formed in, for example, an apparatus or a part.

  In the above-described embodiment, the example in which the primary pressure P1 intake position is provided on the upstream side of the flow rate sensor 12 in the pipe 7 is shown, but it may be provided on the downstream side of the flow rate sensor 12 and on the upstream side of the electromagnetic valve 14. Alternatively, the hot water supply pipe 6 and the water supply pipe 1 may be provided. That is, the take-in position can be set at an arbitrary position upstream of the electromagnetic valve 14.

  In the said embodiment, although the example which applies the control valve of this invention to the immediate hot water supply system which does not have a hot water storage tank was shown, you may apply to the hot water storage type hot water supply system which has a hot water storage tank.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

3 Heat Exchanger, 6 Hot Water Supply Pipe, 7 Pipe, 10 Bathtub, 14 Solenoid Valve, 16 Check Valve, 18 Check Valve, 19 Outlet Pipe, 20 Atmospheric Release Valve, 22 Diaphragm, 24 Valve Body, 29 Inlet Pipe, 30 Body, 38 Introducing pipe section, 40 Discharging pipe section, 48 Introducing pipe section, 54 Thick section, 56 Thin section, 60 Valve seat, 62 Discharge passage, 70 First pressure receiving surface, 72 Second pressure receiving surface, 74 Support section, 80 receiving surface, 180 receiving surface.

Claims (8)

A primary pressure that is a pressure upstream of the control valve, applied to a hot water supply system including a pipe connecting the hot water supply device and the bathtub, and a control valve provided in the pipe and capable of allowing or shutting off the flow of hot water. An atmosphere that receives a differential pressure from a secondary pressure that is downstream of the control valve and opens a portion of the pipe that is downstream of the control valve to the atmosphere in response to a decrease in the primary pressure. In the release valve,
A body having a first introduction pipe section into which the primary pressure is introduced, a second introduction pipe section into which the secondary pressure is introduced, and a discharge pipe section opened to the atmosphere;
A valve seat provided in a passage communicating the second introduction pipe section and the discharge pipe section;
A valve body that is attached to and detached from the valve seat to open and close the passage;
The valve body is fixed in the body so as to partition the passage and the first introduction pipe portion, and the primary pressure is held so that the passage is kept closed when the primary pressure is not reduced. A diaphragm that can be displaced integrally with the valve body in a direction in which the passage opens in response to a decrease in
With
The diaphragm has a first pressure-receiving surface that receives the primary pressure and a second pressure-receiving surface that receives the secondary pressure or atmospheric pressure, and when the valve is closed, the pressure difference in the radially outward direction of the valve body Is provided to receive
The body has a support portion that supports the diaphragm from the outside in the radial direction at least when the valve is closed, receives a force due to the differential pressure via the diaphragm, and receives the pressure when the valve is closed is larger than that when the valve is opened. An air release valve characterized by being provided.   The air release valve according to claim 1, wherein the support portion is configured to be separated from the diaphragm when the valve is opened. The valve seat is provided integrally with one of the second introduction pipe part and the discharge pipe part,
The said support part is provided so that it may overlap partially with respect to the cross section of the pipe line in the other of a said 2nd introductory pipe part and the said discharge pipe part. Air release valve. The valve seat is integrally provided at one open end of the second introduction pipe part and the discharge pipe part,
The atmosphere release valve according to claim 1 or 2, wherein the support part is provided at the other opening end of the second introduction pipe part and the discharge pipe part. The diaphragm is
A thick part attached to and detached from the valve seat as part of the valve body;
A thin portion provided integrally with the thick portion and deformable to displace the valve body in the axial direction;
Have
The air release valve according to any one of claims 1 to 4, wherein the support portion is provided so as to be closer to the valve seat than the thin portion in the axial direction. The thick portion is provided so as to overhang radially outward of the valve seat;
The air release valve according to claim 5, wherein the body is provided with a receiving surface capable of receiving the thick portion in the axial direction outside the valve seat when the valve is closed. A primary pressure that is a pressure upstream of the control valve, applied to a hot water supply system including a pipe connecting the hot water supply device and the bathtub, and a control valve provided in the pipe and capable of allowing or shutting off the flow of hot water. An atmosphere that receives a differential pressure from a secondary pressure that is downstream of the control valve and opens a portion of the pipe that is downstream of the control valve to the atmosphere in response to a decrease in the primary pressure. In the release valve,
A body having a first introduction pipe section into which the primary pressure is introduced, a second introduction pipe section into which the secondary pressure is introduced, and a discharge pipe section opened to the atmosphere;
A valve seat provided in a passage communicating the second introduction pipe section and the discharge pipe section;
A valve body that is attached to and detached from the valve seat to open and close the passage;
The valve body is fixed in the body so as to partition the passage and the first introduction pipe portion, and the primary pressure is held so that the passage is kept closed when the primary pressure is not reduced. A diaphragm that can be displaced integrally with the valve body in a direction in which the passage opens in response to a decrease in
With
The diaphragm is
A thick part attached to and detached from the valve seat as part of the valve body;
A thin portion provided integrally with the thick portion and deformable to displace the valve body in the axial direction;
Have
The thick portion is overhanging radially outward of the valve seat, and is configured to receive an axial differential pressure in the overhanging portion,
An air release valve, wherein the body is provided with a receiving surface capable of receiving the thick portion in the axial direction outside the valve seat when the valve is closed.   The atmosphere release valve according to claim 7, wherein the receiving surface is located on a side away from the valve body in an axial direction with respect to the valve seat.

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