JP5466984B2 - safety valve - Google Patents

Description

  The present invention relates to a safety valve attached to a fluid pipe or the like of a hot water device.

  Conventionally, as this type of safety valve, as shown in FIG. 8, a casing 100 in which a spring protection cylinder 102 is joined to a valve box 101, and a diaphragm 110 that partitions the inside of the casing 100 into a primary chamber 114 and a secondary chamber 116. A diaphragm retainer 109 attached to the diaphragm 110, an operating spring 105 received by the diaphragm retainer 109 to bias the diaphragm 110 toward the primary chamber 114, and a valve seat formed in the primary chamber 114 in response to the diaphragm 110 101a includes a valve body 104 that can be freely attached to and detached from each other, and the valve body 104, the diaphragm 110, and the reinforcing metal fitting 104a are configured as a single unit by a rubber-like elastic body, and the diaphragm retainer 109 is concentrically fitted to the single unit There is one in which the diaphragm retainer 109 is guided by the spring protection cylinder 102 (Patent Document 1). The primary chamber 114 is provided with a connection port 101b communicating with a fluid pipe or a fluid container of a hot water device, and the secondary chamber 116 is provided with a blowout port 102a. According to this safety valve, when the internal pressure of the piping or the like rises abnormally, the diaphragm 110 reacts against the biasing force of the operating spring 105, so that the valve body 104 is separated from the valve seat portion 101a and opened. The fluid corresponding to the excess pressure flows from the primary chamber 114 side to the secondary chamber 116 side and is blown out from the blowout port 102a, thereby preventing an abnormal increase in pressure in the piping or the like.

Japanese Utility Model Publication No. 61-28929

  However, since the safety valve does not have a function of introducing the atmosphere into the pipe to destroy the negative pressure when a negative pressure is generated in the pipe or the like, the negative pressure in the pipe cannot be eliminated. However, when the negative pressure destruction function is further provided in the safety valve, the number of structural parts increases and the configuration becomes complicated. In addition, the number of assembling steps for the parts increases, the productivity is deteriorated, and the cost is increased. Furthermore, there is a possibility that the sealing performance between the assembled parts may be reduced due to an increase in the number of assemblies.

  The present invention has been made in view of the above circumstances, and suppresses an increase in the number of parts, suppresses an increase in the number of parts assembling steps, and does not deteriorate the sealing performance, and has a function of preventing an abnormal pressure increase. It is an object of the present invention to provide a safety valve having a pressure breaking function.

The safety valve according to the present invention is:
A valve box with two mouths;
A diaphragm that divides the inside of the valve box into a primary chamber that communicates with the first mouth and a secondary chamber that communicates with the second mouth;
A diaphragm retainer combined with the diaphragm;
An operating spring that is received by the diaphragm holder and biases the diaphragm toward the primary chamber;
A communication hole provided in the diaphragm retainer for communicating the primary chamber and the secondary chamber;
A valve body disposed on the primary chamber side to freely open and close the communication hole;
A valve stem that extends from the valve body and is inserted into a guide hole formed through the diaphragm at the center of the diaphragm retainer and protrudes toward the secondary chamber;
A valve spring that is extrapolated to the arrangement part on the secondary chamber side of the valve stem and urges the valve body in the valve closing direction to close the communication hole;
A pressure regulating shaft that is opposed to the end of the valve stem on the secondary chamber side and is arranged to adjust the distance from the end of the valve stem,
The valve body and the valve stem are configured as a single part formed by integral molding, and a cylindrical peripheral wall projecting from the valve body is configured to contact the diaphragm detachably with the diaphragm as a valve seat ,
The valve box has a large-diameter portion in which the diaphragm is disposed, and a projection for stopping the diaphragm from moving to the primary chamber side at a predetermined position protrudes from a step portion connected to the large-diameter portion. And
On the surface of the diaphragm on the primary chamber side, a washer formed by integral molding is disposed at a position corresponding to the receiving position of the operating spring, and this washer is configured to abut against the convex portion .

With the above configuration, when the internal pressure of a pipe or the like connected to the primary chamber rises above the set pressure, the diaphragm is displaced toward the secondary chamber against the elastic force of the operating spring due to the pressure increase in the primary chamber. When the diaphragm is displaced, the valve element is displaced in the same direction by the valve spring while being seated on the diaphragm serving as a valve seat. When the valve stem integrated with the valve body abuts on the pressure adjustment shaft, the valve body is further separated from the diaphragm by the diaphragm displaced further to the secondary chamber side, and the valve is opened on the primary chamber side through the communication hole. The fluid corresponding to the excess pressure is released to the secondary chamber side. As a result, when the pressure in the primary chamber drops to the set value, the diaphragm is displaced toward the primary chamber by the elastic force of the operating spring, and the valve element is seated on the diaphragm serving as the valve seat and is closed. As described above, an abnormal increase in pressure in the pipe or the like is prevented.
Further, the valve box is provided with a protruding portion for stopping movement of the diaphragm to the primary chamber side at a predetermined position. In this case, a washer is provided on the surface of the diaphragm corresponding to the receiving position of the operating spring so that it comes into contact with the convex portion with the washer. The washer is formed as a single part together with the diaphragm by being formed by integral molding using an insert molding method or the like.

  On the other hand, when the pressure in the piping connected to the primary chamber side becomes negative, the pressure in the primary chamber drops (negative pressure) from the atmospheric pressure in the secondary chamber communicating with the outside. Then, the valve body is pressed toward the primary chamber against the elastic force of the valve spring by the pressure (atmospheric pressure) of the secondary chamber through the communication hole, and the valve body is released from the diaphragm serving as the valve seat, and is opened. Atmospheric pressure is sucked from the secondary chamber into the primary chamber through the communication hole. As a result, when the negative pressure in the piping or the like is eliminated and the pressure in the primary chamber rises to a set value, the valve element is seated on the diaphragm serving as the valve seat and is closed by the elastic force of the valve spring. As a result, negative pressure in the pipe or the like is prevented. In this way, the pressure can be quickly returned to the set pressure not only when the pressure in the primary pipe or the like abnormally rises but also when the pressure becomes negative.

  And, by configuring the valve body and the valve stem as one part formed by integral molding, the number of parts can be reduced, so the configuration can be simplified, and the assembly of the valve body and valve stem parts Since the number of man-hours is reduced, productivity can be improved and an increase in cost can be suppressed. In addition, the sealing performance between these parts can be improved as compared with the assembly of the parts of the valve body and the valve stem.

It is desirable that the end of the peripheral wall of the valve body be tapered so as to contact the diaphragm.
In this case, the peripheral wall of the valve body can be strongly pressed against the diaphragm serving as the valve seat, and the sealing performance between the valve body and the diaphragm can be improved.

It is desirable that the diaphragm and the diaphragm retainer are formed as a single part formed by integral molding.
In this case, since the number of parts is further reduced, the configuration can be further simplified, and the man-hours for assembling these parts can be further reduced, so that productivity can be improved and costs can be increased. Can also be suppressed. Moreover, the sealing performance between these parts can be improved compared with what assembled each part of the diaphragm and the diaphragm holding | suppressing part.

The diaphragm holder is formed on the surface facing the secondary chamber side of the diaphragm,
The guide hole includes a guide cylinder that protrudes toward the secondary chamber and receives a valve spring and inserts and supports the valve rod, and a cylinder portion that extends toward the primary chamber and is provided on the inner wall of the center hole of the diaphragm.
The cylinder portion is formed with a flange portion extending outward from the tip thereof to embrace the periphery of the center hole of the diaphragm, and a valve seat on which the valve body abuts the surface of the diaphragm exposed to the outside of the flange portion. Is desirable.

  According to this, it is possible to insert and support the valve rod straightly and stably in the axial direction of the guide hole by the guide cylinder. Therefore, the posture of the valve body formed on the valve stem is held in parallel without being inclined with respect to the diaphragm surface forming the valve seat, and the sealing performance by the valve body is stably exhibited. In addition, the above-mentioned cylindrical portion and flange portion can firmly connect the diaphragm retainer to the diaphragm, and the valve seat serving as a sealing surface can be formed by the diaphragm.

  As described above, according to the safety valve according to the present invention, in providing a function of negative pressure destruction together with a function of preventing an abnormal increase in pressure on the primary side, an increase in the number of parts can be suppressed, and the configuration can be simplified. Productivity is improved, sealing performance can be improved, and cost is not increased. In addition, since the safety valve according to the present invention has both functions of a relief valve and a negative pressure release valve, compared to the case where the relief valve and the negative pressure release valve are respectively installed in the hot water device etc., to the hot water device etc. Can be easily installed, the configuration of the hot water device and the like can be simplified, and the cost of the hot water device and the like can be reduced.

It is sectional drawing which shows the valve closing state of the safety valve by a reference example . It is a side view which shows the external appearance of the safety valve by a reference example . It is a top view which shows the external appearance of the safety valve by a reference example . It is sectional drawing which shows the forced valve opening state which hold | maintained the operation lever upright. It is sectional drawing which shows the valve opening state at the time of the pressure rise of a primary side. It is sectional drawing which shows the valve opening state at the time of the primary side negative pressure. It is sectional drawing which shows the valve closing state of the safety valve of embodiment . It is sectional drawing which shows the valve closing state of the conventional safety valve.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(Reference example)
As shown in FIG. 1, a safety valve 1 according to a reference example includes a valve box 10 having two ports 13 and 15, a primary chamber 14 that connects the valve box 10 to the first port 13, and a second port. And a diaphragm 2 which is partitioned into a secondary chamber 16 communicating with 15. The first mouth portion 13 and the second mouth portion 15 are formed at right angles, and the first mouth portion 13 is connected to a fluid piping or a fluid container of a hot water device, and the second mouth portion 15 is It is open to the atmosphere. The valve box 10 is made of resin, and includes a lower box 11 having a first mouth portion 13 provided at a lower portion thereof and an upper box 12 having a second mouth portion 15 provided at a side thereof. Are joined with the diaphragm 2 interposed therebetween. The lower box 11 has an opening on the arrangement side of the diaphragm 2 as a large-diameter portion 11a, and the step portion 11b connected to the large-diameter portion 11a has a predetermined movement of the diaphragm 2 toward the primary chamber 14 side. A convex portion 17 for stopping at a position is projected in a ring shape. The upper box 12 is provided with a pressure adjusting unit 6 for adjusting a pressure set value when releasing an excess pressure in a fluid pipe or the like (primary side) connected to the first port 13.

  A diaphragm retainer 3 is formed on the diaphragm 2 on the upper surface facing the secondary chamber 16. The diaphragm 2 is made of a rubber sheet, and the diaphragm holder 3 is made of resin. The diaphragm 2 and the diaphragm retainer 3 are composed of one part integrally formed by a two-color molding method or the like of injection molding. An operating spring 4 is disposed in a compressed state between the diaphragm holder 3 and the ceiling surface of the upper box 12, and the diaphragm 2 is biased toward the primary chamber 14 by the elastic force of the operating spring 4. The diaphragm presser 3 is provided with cylindrical ridges 31 and 32 projecting in an inner and outer double manner on the outer peripheral portion of the upper surface thereof. One end of the operating spring 4 is received in the recess 33 between the inner and outer protrusions 31, 32 of the diaphragm retainer 3, and the other end is received in the recess 18 formed on the ceiling surface of the upper box 12. In addition, a plurality of protrusions 34 are formed on the lower surface of the diaphragm retainer 3 so as to penetrate the diaphragm 2 and protrude toward the primary chamber 14 at locations corresponding to the receiving positions of the operating springs 4. These projections 34 are opposed to the projections 17 projecting from the step 11b of the lower box 11, and contact with the projections 17 allows the movement of the diaphragm 2 to the primary chamber 14 side at a predetermined position. Stopped. In addition, since the protrusion 34 is not provided in a ring shape, but is provided in a plurality on the circumference, the pressure in the primary chamber 14 is transmitted to the outside of the convex portion 17 so that the entire lower surface of the diaphragm 2 is provided. To act on.

  A guide hole 35 formed through the diaphragm 2 and a plurality of communication holes 30 that connect the primary chamber 14 and the secondary chamber 16 around the guide hole 35 are provided at the center of the diaphragm retainer 3. . The valve body 5 that allows the communication hole 30 to be opened and closed is disposed on the primary chamber 14 side, and a valve rod 50 extending from the valve body 5 is inserted through the guide hole 35 and protrudes into the secondary chamber 16. Yes. The valve body 5 and the valve stem 50 are constituted by a single resin part formed by integral molding such as injection molding.

  The guide hole 35 includes a guide cylinder 36 that protrudes toward the secondary chamber 16 and a cylinder portion 37 that extends toward the primary chamber 14. The valve rod 50 is provided with a valve spring 53 that is less elastic than the operating spring 4. One end of the valve spring 53 is received on the outer periphery of the guide cylinder 36, and the other end is located near the upper end of the valve rod 50. It is received by the snap ring 54 fitted. In this way, the valve spring 53 is disposed in a compressed state between the snap ring 54 and the diaphragm retainer 3, and the valve rod 50 is drawn into the secondary chamber 16 side by the elastic force of the valve spring 53, so that the valve body 5 Is urged in the valve closing direction to close the communication hole 30.

  Further, a flange portion 38 extending outward from the tip of the tube portion 37 of the guide hole 35 is formed. A cylindrical portion 37 is provided on the inner wall of the center hole 20 of the diaphragm 2, and a flange portion 38 is formed so as to embrace the periphery of the center hole 20 on the lower surface (the surface facing the primary chamber 14 side) of the diaphragm 2. As a result, the diaphragm retainer 3 is firmly bonded to the diaphragm 2.

  The valve body 5 includes a disc portion 51 extending in a direction perpendicular to the axis of the valve stem 50, and a cylindrical peripheral wall portion 52 that protrudes from the outer peripheral end of the disc portion 51 to the opposite side of the diaphragm 2. The distal end 52a of the peripheral wall portion 52 of the valve body 5 is tapered, and the distal end 52a of the peripheral wall portion 52 defines the exposed portion of the diaphragm 2 outside the flange portion 38 on the lower surface of the diaphragm 2 as the valve seat 21 (seal Surface) so as to be freely attached and detached. That is, the flange portion 38 is provided so that the valve seat 21 serving as a seal surface is formed by the diaphragm 2. Since the distal end 52a of the peripheral wall 52 of the valve body 5 has a tapered shape, it can be strongly pressed against the diaphragm 2, and as a result, the sealing performance between the valve body 5 and the diaphragm 2 is improved.

  Further, the substantially plate thickness portion of the diaphragm presser 3 in the guide hole 35 and the guide cylinder 36 are set so that the inner diameter is substantially the same as the outer diameter of the valve stem 50 (same as or slightly larger than the outer diameter of the valve stem 50). ing. As a result, the valve stem 50 can be inserted and supported straight and stably in the axial direction of the guide hole 35, so that the posture of the valve body 5 formed on the valve stem 50 is relative to the diaphragm surface forming the valve seat 21. It is held parallel without tilting, and the sealing performance by the valve body 5 is more stably exhibited.

  The pressure adjusting unit 6 includes a pressure adjusting shaft 60 which is opposed to the end of the valve rod 50 on the secondary chamber 16 side and is arranged so that the distance from the end of the valve rod 50 can be adjusted. The pressure adjusting shaft 60 is slidably inserted into the through hole 19 provided in the upper wall of the upper box 12 and protrudes into the secondary chamber 16 with the sealing material 68 securing the water tightness of the through hole 19. . A screw groove 60a is formed in the upper part of the pressure adjusting shaft 60, and a pressure adjusting nut 61 is screwed into the screw groove 60a. The pressure adjusting nut 61 is slidably accommodated in a cylindrical sleeve 62 that surrounds the through hole 19 and stands on the upper surface of the upper box 12. A ring-shaped presser plate 63 is attached to the bottom of the sleeve 62, and a pressure adjusting spring 67 is disposed in a compressed state between the presser plate 63 and an annular recess 61 a formed on the lower surface of the pressure adjusting nut 61. Yes.

  2 and 3, a snap ring 64 is fitted on the outer surface of the base end portion of the sleeve 62, and the upper surface of the flange portion 65 formed on the snap ring 64 and the pressure adjusting nut 61 is A pair of arms 66 having a U-shaped cross section are attached between them, and the pressure adjusting shaft 60 and the pressure adjusting nut 61 are held in a retaining state. The upper ends of the pair of arms 66 have tongue pieces 66a bent upward, and the manual lever 7 is attached to the tongue pieces 66a by a split pin 70 so as to be vertically rotatable.

  The manual lever 7 is normally arranged in a lateral orientation orthogonal to the pressure adjusting shaft 60, and when the manual lever 7 is rotated upward or downward, an operation piece 71 is formed to hang from the front of the manual lever 7. The upper surface of the flange portion 65 of the pressure adjusting nut 61 is pushed downward. Thereby, the pressure regulating shaft 60 moves downward together with the pressure regulating nut 61 to move the valve rod 50 toward the primary chamber 14, whereby the valve body 5 can be forcibly opened. Then, by releasing the pressing force applied to the pressure adjusting nut 61 by the manual lever 7, the pressure adjusting shaft 60 is retracted by the elastic force of the pressure adjusting spring 67, and the valve body 5 is moved by the elastic force of the valve spring 53. To return to the closed state.

  In order to maintain the forced valve opening state, as shown in FIG. 4, the manual lever 7 is pushed up to stand on the pressure adjusting nut 61, and the pressure adjusting nut 61 is held in the pressed down state as described above. The valve body 5 is held in a forced valve opening state in which the valve body 5 is detached from the diaphragm 2. In order to cancel this forced valve opening state, the valve body 5 returns to the valve closing state by pushing down the manual lever 7 and returning it to the original horizontal posture.

  When the manual lever 7 is in the horizontal posture, a tool such as a screwdriver is inserted through an opening 72 formed near the tip of the manual lever 7 and engaged with a groove 66b provided at the upper end of the pressure adjusting shaft 60 to adjust the pressure. By rotating the shaft 60 and adjusting the screwing amount of the pressure adjusting shaft 60 into the pressure adjusting nut 61, the distance between the pressure adjusting shaft 60 and the valve stem 50 can be adjusted. Since the set value of the pressure when the excess pressure in the pipe or the like is released is determined by the spring constant of the operating spring 4 and the interval between the pressure regulating shaft 60 and the valve stem 50, the lower end of the pressure regulating shaft 60 By adjusting the distance between the upper end of the valve stem 50 and the upper end of the valve stem 50, it is possible to adjust the pressure set value when the excess pressure is released.

Next, the operation of the safety valve 1 configured as described above will be described.
When the internal pressure of piping or the like connected to the primary chamber 14 side rises above the set pressure, referring to FIG. 5 together with FIG. 1, the diaphragm rises against the elastic force of the operating spring 4 by the pressure increase in the primary chamber 14. 2 is displaced to the secondary chamber 16 side. When the diaphragm 2 is displaced, the valve body 5 is displaced in the same direction by the valve spring 53 while being seated on the diaphragm 2 serving as the valve seat 21. When the valve rod 50 integrated with the valve body 5 comes into contact with the pressure adjusting shaft 60, the valve body 5 is separated from the diaphragm 2 and opened by the diaphragm 2 which is further displaced toward the secondary chamber 16 (FIG. 5). Reference), the fluid corresponding to the excess pressure on the primary chamber 14 side is released to the secondary chamber 16 side through the communication hole 30. As a result, when the pressure in the primary chamber 14 drops to the set value, the diaphragm 2 is displaced toward the primary chamber 14 by the elastic force of the operating spring 4, and the valve body 5 is seated on the diaphragm 2 that becomes the valve seat 21 and is closed. I speak. As described above, an abnormal increase in pressure in the pipe or the like is prevented.

  On the other hand, when the pressure in the pipe connected to the primary chamber 14 side becomes negative, referring to FIG. 6 together with FIG. 1, the pressure in the primary chamber 14 is higher than the atmospheric pressure in the secondary chamber 16 communicating with the outside. Pressure drops (negative pressure). Then, the valve body 5 is pressed toward the primary chamber 14 against the elastic force of the valve spring 53 by the pressure (atmospheric pressure) of the secondary chamber 16 through the communication hole 30, so that the valve body 5 serves as the valve seat 21. And the valve is opened (see FIG. 6), and atmospheric pressure is sucked into the primary chamber 14 from the secondary chamber 16 through the communication hole 30. As a result, when the negative pressure in the piping or the like is eliminated and the pressure in the primary chamber 14 rises to a set value, the valve body 5 is seated on the diaphragm 2 serving as the valve seat 21 by the elastic force of the valve spring 53 and the valve is closed. To do. As a result, negative pressure in the pipe or the like is prevented. In this way, the pressure can be quickly returned to the set pressure not only when the pressure in the primary pipe or the like abnormally rises but also when the pressure becomes negative.

  As described above, the safety valve 1 has the functions of a relief valve and a negative pressure release valve. The valve body 5 and the valve stem 50 are constituted by one part formed by integral molding, and the diaphragm 2 and the diaphragm retainer 3 are also constituted by one part formed by integral molding. Accordingly, since the number of parts constituting the safety valve 1 is reduced, the configuration of the safety valve 1 can be simplified. And since the assembly man-hour of these components is reduced, productivity can be improved and it can also suppress that it becomes expensive. Furthermore, the sealing performance between these parts can be improved compared to the parts in which the valve body 5 and the valve stem 50 are assembled. Similarly, the parts of the diaphragm 2 and the diaphragm retainer 3 are assembled. Compared with, the sealing performance between these parts can be improved.

Thus, according to the safety valve 1 according to the reference example , in providing the function of preventing the abnormal increase in pressure on the primary side and the function of negative pressure destruction, the increase in the number of parts can be suppressed, and the configuration can be simplified. Productivity is improved, sealing performance can be improved, and cost is not increased. In addition, since the safety valve 1 has both functions of a relief valve and a negative pressure release valve, the safety valve 1 is installed in a hot water device, etc., compared to the case where a relief valve and a negative pressure release valve are installed for the hot water device, etc. Work is easy, the configuration of the hot water device and the like can be simplified, and the cost of the hot water device and the like can be reduced.

( Embodiment )
As shown in FIG. 7, in the safety valve 1A of the present embodiment , a metal annular washer 8 is disposed at the lower surface position of the diaphragm 2 corresponding to the receiving position of the operating spring 4, and this washer 8 Therefore, it is made to contact | abut to the convex part 17A which protrudes in the step part 11b of the lower box 11. FIG. In this case, the diaphragm 2, so never transmembrane portion which is disposed a plurality of protrusions 34, such as shown be weaker Zenben 1 in Figure 1 is formed, to be kept high sealing performance of the diaphragm 2 it can. The washer 8 is formed as an integral part together with the diaphragm 2 and the diaphragm retainer 3 by being formed by integral molding using an insert molding method or the like. Further, since the convex portion 17A is not projecting in an annular shape, but a plurality of convex portions are projected on the circumference, the pressure in the primary chamber 14 is transmitted to the outside of the convex portion 17A, and the lower surface of the diaphragm 2 It works to the whole. Other configurations are the same as those of the reference example of FIG.
In addition, this invention is not limited to the said embodiment, A various change is possible within the range of the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Safety valve 2 Diaphragm 3 Diaphragm holding | suppressing 4 Actuating spring 5 Valve body 6 Pressure regulation part 10 Valve box 13,15 Port 14 Primary chamber 16 Secondary chamber 20 Diaphragm center hole 21 Valve seat 30 Communication hole 35 Guide hole 36 Guide cylinder 37 Tube portion 38 Flange portion 50 Valve rod 53 Valve spring 60 Pressure adjusting shaft

Claims (4)

A valve box with two mouths;
A diaphragm that divides the inside of the valve box into a primary chamber that communicates with the first mouth and a secondary chamber that communicates with the second mouth;
A diaphragm retainer combined with the diaphragm;
An operating spring that is received by the diaphragm holder and biases the diaphragm toward the primary chamber;
A communication hole provided in the diaphragm retainer for communicating the primary chamber and the secondary chamber;
A valve body disposed on the primary chamber side to freely open and close the communication hole;
A valve stem that extends from the valve body and is inserted into a guide hole formed through the diaphragm at the center of the diaphragm retainer and protrudes toward the secondary chamber;
A valve spring that is extrapolated to the arrangement part on the secondary chamber side of the valve stem and urges the valve body in the valve closing direction to close the communication hole;
A pressure regulating shaft that is opposed to the end of the valve stem on the secondary chamber side and is arranged to adjust the distance from the end of the valve stem,
The valve body and the valve stem are configured as a single part formed by integral molding, and a cylindrical peripheral wall projecting from the valve body is configured to contact the diaphragm detachably with the diaphragm as a valve seat ,
The valve box has a large-diameter portion in which the diaphragm is disposed, and a projection for stopping the diaphragm from moving to the primary chamber side at a predetermined position protrudes from a step portion connected to the large-diameter portion. And
A safety valve having a structure in which a washer formed by integral molding is disposed at a position corresponding to the receiving position of the operating spring on the surface of the diaphragm on the primary chamber side, and the washer is brought into contact with the convex portion with the washer . The safety valve according to claim 1,
A safety valve having a configuration in which a peripheral wall end of the valve body is tapered to be in contact with a diaphragm. In the safety valve according to claim 1 or 2,
A safety valve comprising a single part formed by integrally molding the diaphragm and the diaphragm retainer. In the safety valve according to any one of claims 1 to 3,
The diaphragm holder is formed on the surface facing the secondary chamber side of the diaphragm,
The guide hole includes a guide cylinder that protrudes toward the secondary chamber and receives a valve spring and inserts and supports the valve rod, and a cylinder portion that extends toward the primary chamber and is provided on the inner wall of the center hole of the diaphragm.
The cylinder portion is formed with a flange portion extending outward from the tip thereof to embrace the periphery of the center hole of the diaphragm, and a valve seat on which the valve body abuts the surface of the diaphragm exposed to the outside of the flange portion. Safety valve.

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