JP6879538B2 - Relief valve - Google Patents

Description

The present invention relates to a relief valve used in, for example, a hot water supply device.

Conventionally, as a relief valve, a valve body having a primary side connection port and a secondary side connection port is provided between the primary side connection port and the secondary side connection port, and when the pressure on the primary side exceeds the set pressure. It is equipped with a valve body that opens the valve to release the pressure on the primary side to the secondary side, and a forced valve opening mechanism for forcibly opening the valve body in an emergency or maintenance inspection. It is known that a pressure adjusting mechanism for adjusting the set pressure on the primary side until valve opening is provided.

As the forced valve opening mechanism, for example, as described in Patent Documents 1 and 2 below, a manually operated lever rotatably supported by the valve body and a movement that moves in the axial direction with the operation of the manually operated lever. It has a nut member that is a body and a lift valve shaft that is screwed into (screw hole) of the nut member and slidably inserted into the upper part of the valve body. A valve shaft integrally connected to the nut member is pushed down.

On the other hand, the pressure adjusting mechanism utilizes the screwing between the valve lift shaft and the nut member constituting the forced valve opening mechanism, and by rotating the lift valve shaft with respect to the nut member and moving it in the axial direction. By changing the gap between the valve lift shaft (lower end) and the valve body (upper end), the set pressure on the primary side can be adjusted.

Japanese Patent No. 5518029 Japanese Unexamined Patent Publication No. 2013-87805

However, in the conventional relief valves described in Patent Documents 1 and 2, the manually operated lever acts directly on the nut member constituting the pressure regulating mechanism when the valve body is forcibly opened, so that the manually operated lever is operated. The gap between the valve shaft and the valve body changes due to wear of the nut member or loosening of the screw between the valve shaft and the nut member constituting the pressure regulating mechanism. There was a risk that the set pressure would change.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a relief valve capable of suppressing a change in set pressure on the primary side as much as possible until the valve body is opened. To do.

In order to solve the above problems, the relief valve according to the present invention is arranged between a valve body having a primary side connection port and a secondary side connection port, and between the primary side connection port and the secondary side connection port. The valve body is provided with a valve body that opens when the pressure on the primary side exceeds the set pressure and releases the pressure on the primary side to the secondary side, and the valve body is provided with a valve body forcibly opening the valve body. On the other hand, a forced valve opening mechanism having a lift valve shaft movably arranged and a manually operated lever that acts on the lift valve shaft and pushes down the valve lift shaft is provided, and a primary valve until the valve body is opened. A pressure adjusting member for adjusting the set pressure on the side is screwed and attached to the valve body, and a compression coil spring is compressed between the pressure adjusting member and the valve lifting shaft. There is. Further, the relief valve according to the present invention is arranged between the valve body having the primary side connection port and the secondary side connection port and the primary side connection port and the secondary side connection port, and the pressure on the primary side is applied. It is equipped with a valve body that opens the valve when the pressure exceeds the set pressure and releases the pressure on the primary side to the secondary side, and is movable with respect to the valve body in order to forcibly open the valve body. A forced valve opening mechanism having a lift valve shaft and a manual operation lever that acts on the lift valve shaft and pushes down the valve lift shaft is provided, and the set pressure on the primary side until the valve body is opened is adjusted. The pressure adjusting member is screwed and attached to the valve body, and the valve shaft comes into contact with the pressure adjusting member when the valve shaft moves with respect to the pressure adjusting member. It is characterized in that a stopper portion that defines the movement limit of the lifting valve shaft with respect to the valve body is provided.

In a preferred embodiment, the pressure adjusting member is inserted into and screwed into an inner cylinder portion formed in the valve body along the opening / closing direction of the valve body.

In another preferred embodiment, the pressure adjusting member has a tubular shape, and the valve lifting shaft is slidably inserted into the pressure adjusting member.

In a more preferred embodiment, the compression coil spring is compressed between the pressure regulating member and the valve lift shaft.

In another preferred embodiment, the pressure regulating member is provided with a stopper portion that defines the movement limit of the valve lifting shaft with respect to the valve body.

In a more preferred embodiment, the stopper portion is provided at the upper end portion of the pressure adjusting member.

In a further preferred embodiment, an engaging groove for rotating the pressure adjusting member with respect to the valve body is provided at the upper end portion of the pressure adjusting member.

According to the relief valve according to the present invention, the forced valve opening mechanism for forcibly opening the valve body acts on the valve body and the valve lift shaft movably arranged with respect to the valve body. It has a manual operation lever that pushes down the valve lift shaft, and a pressure regulating member that adjusts the set pressure on the primary side until the valve body is opened is screwed to the valve body and attached to the valve body when the valve body is forcibly opened. , The manually operated lever does not act directly on the pressure regulating member. Therefore, deformation due to wear of the pressure regulating member and loosening of the screw of the pressure regulating member with respect to the valve body are suppressed, so that the change in the set pressure on the primary side until the valve body is opened can be suppressed as much as possible. it can.

The perspective view which shows one Embodiment of the relief valve which concerns on this invention. FIG. 3 is a vertical cross-sectional view showing a closed state of the relief valve shown in FIG. The vertical cross-sectional view which shows the valve opening state of the relief valve shown in FIG. FIG. 3 is a vertical cross-sectional view showing an operating state of the forced valve opening state of the relief valve shown in FIG. FIG. 3 is a vertical cross-sectional view showing a hold state of the forced valve opening state of the relief valve shown in FIG.

Hereinafter, embodiments of the relief valve according to the present invention will be described with reference to the drawings.

<Structure of relief valve 1>
FIG. 1 is a perspective view showing an embodiment of a relief valve according to the present invention. 2 to 5 are vertical cross-sectional views showing the relief valve shown in FIG. 1, FIG. 2 is a valve closed state, FIG. 3 is a valve open state, and FIG. 4 is an operation state in a forced valve open state. 5 indicates a hold state in a forced valve opening state, respectively.

The relief valve 1 of the present embodiment is basically used by being incorporated in the hot water supply device in a posture in which the secondary side connection port 8 provided in the valve body 10 is on the lower side.

The relief valve 1 of the illustrated embodiment is mainly a valve body 10, a pressure response valve (valve body) 20 arranged inside the valve body 10 and opening and closing according to the pressure on the primary side, and a diaphragm valve body. A forced valve opening mechanism 40 including a valve lifting shaft 41, a manually operated lever 60, and the like is provided.

The valve body 10 is divided into a lower case 10A and an upper case 10B made of synthetic resin. The lower case 10A has a cylindrical shape with a large diameter and a rough step toward the upper stage side, and the upper case 10B has a cylindrical shape with a large diameter and a rough step toward the lower stage side. The lower case 10A and the upper case 10B are fastened and fixed to each other by, for example, a tapping screw 19.

From the upper part to the middle part of the lower case 10A, the accommodating hole 13 for accommodating the pressure response valve 20 is formed in a substantially inverted truncated cone shape. In the accommodating hole 13 (inner peripheral surface), a support portion 13a that supports the outer peripheral side (outer skirt portion 22c) of the pressure response valve 20 in order to guide the movement of the pressure response valve 20 is provided along the circumferential direction. (In the illustrated example, three locations are provided at equal intervals). Between the adjacent support portions 13a, a vertical fan-shaped passage through which a fluid such as steam or hot water flows is formed, and the upper end portion of the support portion 13a is a lowering of the diaphragm valve body 30 (diaphragm 31). It is a stopper that sets the limit. The lower portion of the lower case 10A is provided with a cylindrical primary side connection port 7 that communicates with the storage hole 13 and is connected to the primary side (for example, the upper part of the hot water storage tank) by a pipe or the like.

The diameter of the primary side connection port 7 is slightly smaller than the minimum diameter of the accommodation hole 13, and a stepped portion (terrace surface) formed between the primary side connection port 7 and the accommodation hole 13 is formed. ) 11 is a spring receiver that receives the lower end of the first valve closing spring 12 that urges the pressure response valve 20 upward (valve closing direction). In the step portion 11, the first valve closing portion 11a has a plan view fan shape in which the lower end portion of the first valve closing spring 12 is fitted inside the step portion 11 in order to limit the movement of the first valve closing spring 12. It is erected at a plurality of locations (in the illustrated example, three locations at equal angular intervals and below the support portion 13a) along the circumference of the spring 12.

The pressure response valve (valve body) 20 has a stepped cylindrical shape with an upper end closed, and has a small diameter portion 21 formed to have a relatively small diameter from the upper side, and the small diameter portion 21 is integrated with the small diameter portion 21 to have a diameter. It has a large diameter portion 22 formed to be relatively large. The small diameter portion 21 is inserted into the contacting member 32 (cylindrical portion) of the diaphragm valve body 30, which will be described later, and its upper surface is formed to be flat in order to efficiently receive the pressing force from the valve lifting shaft 41. ing. Further, an annular flange portion 23 for holding the sealing member 15 to be pinched is projected on the outer periphery of the substantially middle abdomen of the small diameter portion 21.

On the other hand, the large diameter portion 22 is arranged outside the ceiling portion 22a connected to the lower end portion of the small diameter portion 21, the inner skirt portion 22b extending downward from the ceiling portion 22a, and the inner skirt portion 22b, and also on the ceiling. It is composed of an outer skirt portion 22c extending downward from the portion 22a. The inner skirt portion 22b is formed longer than the outer skirt portion 22c (in the vertical direction), and the upper end portion of the first valve closing spring 12 is housed between the inner skirt portion 22b and the outer skirt portion 22c. That is, the first valve closing spring 12 is the ceiling portion 22a (the portion between the inner skirt portion 22b and the outer skirt portion 22c) of the large diameter portion 22 of the pressure response valve 20 and the lower case 10A of the valve body 10 described above. It is reduced to and from the step portion 11 (the portion inside the positioning portion 11a in the).

Further, a rubber sealing member 15 is externally attached to the small diameter portion 21 of the pressure response valve 20. The seal member 15 is formed in the shape of a thick disk having a diameter slightly smaller than the ceiling portion 22a of the large diameter portion 22, and is sandwiched between the ceiling portion 22a of the large diameter portion 22 and the flange portion 23 of the small diameter portion 21. There is. An annular valve seat 16a with an annular valve port 16a is formed at the outer peripheral end of the upper surface of the seal member 15 so as to contact and separate from the attachment member 32 (flat plate portion) of the diaphragm valve body 30, which will be described later.

The uppermost portion of the lower case 10A is a collar-shaped diaphragm receiving portion 10a having an L-shaped cross section. An annular protrusion 10b is projected upward (on the diaphragm 31 side) at the inner peripheral end of the diaphragm receiving portion 10a.

An inner cylinder portion 18 (along the vertical direction) into which a pressure adjusting member 45 or the like, which will be described later, is inserted is provided on the inner circumference of the upper portion of the upper case 10B, and a hose, for example, is connected to the middle portion on one side thereof. The secondary side connection port 8 is provided. Further, the inner circumference of the lower stage portion is a diaphragm operating chamber 14 for accommodating the diaphragm valve body 30. The inner cylinder portion 18 is located coaxially with the accommodating hole 13 of the lower case 10A described above, and the diaphragm valve body 30 is placed downward (between the inner cylinder portion 18 and the outer cylinder portion 17 of the upper case 10B). The upper end side of the second valve closing spring 34 that is urged in the valve closing direction) is accommodated. That is, the upper end of the second valve closing spring 34 is received by the ceiling portion 10c (the portion between the inner cylinder portion 18 and the outer cylinder portion 17) of the upper case 10B.

The diaphragm valve body 30 includes a rubber diaphragm 31, a flat plate-shaped contacting member 32 with a cylindrical portion on which the sealing member 15 (valve seat 16) of the pressure response valve 20 described above is seated, and a second valve closing spring 34. It has a bottomed short cylindrical spring receiver 33 with a central hole that receives the lower end of the case, and the second valve closing spring 34 is compressed between the ceiling portion 10c of the upper case 10B and the spring receiver 33. .. The spring receiver 33 is made of, for example, a stainless steel material, and also serves as a stopper for determining the rising limit position of the diaphragm 31.

The outer peripheral portion of the diaphragm 31 is held by being sandwiched between the flange-shaped portion 10d provided at the lower end of the upper case 10B and the diaphragm receiving portion 10a at the uppermost stage of the lower case 10A. The inner peripheral portion of the diaphragm 31 is held under pressure by the contacting member 32 and the spring receiver 33. Specifically, the upper end of the contacting member 32 (cylindrical portion) with the inner peripheral portion of the diaphragm 31 interposed between the contacting member 32 (flat plate portion) and the spring receiver 33 (bottom portion). By crimping the formed thin-walled protruding portion to the outside, the diaphragm 31, the contacting member 32, and the spring receiver 33 are integrated.

A connecting pipe 9 for connecting a hose or the like to the outer end (opening) is connected to the secondary side connecting port 8 communicating with the diaphragm operating chamber 14, and intake air is taken into the intermediate portion (opening formed in) thereof. A valve 50 is attached.

The intake valve 50 has an intake pipe 52 for sucking air into the valve body 10 through the secondary side connection port 8, and the base end of the intake pipe 52 is an intermediate portion of the secondary side connection port 8. It is internally fitted (with an O-ring 54 in between) and connected to the formed opening). A shielding wall 52d for preventing steam or hot water from the primary side from entering the intake pipe 52 is provided on the portion of the base end of the intake pipe 52 on the valve body 10 side (secondary side connection port 8). (Towards the inside of) is erected.

The intake pipe 52 has a first passage portion 52a extending substantially vertically from the secondary side connection port 8 and a second passage portion 52b that bends substantially vertically from the tip of the first passage portion 52a, and the second passage portion 52b. A connecting tool 53 having an intake valve port 53b having a diameter substantially the same as that of the second passage portion 52b and a valve body accommodating chamber 53a having a diameter larger than that of the second passage portion 52b and the intake valve port 53b is connected to the tip end side of the above. There is. The valve body accommodating chamber 53a side end of the connector 53 is fitted onto the tip of the second passage portion 52b of the intake pipe 52 and fixed by, for example, ultrasonic welding, and is fixed to the valve body accommodating chamber 53a, for example, made of rubber. The ball valve body 51 is movably housed.

The ball valve body 51 is sucked into the tip side of the second passage portion 52b or pressed against the intake valve port 53b side in response to a pressure change or the like inside the relief valve 1. When the ball valve body 51 is pressed toward the intake valve port 53b, the intake valve port 53b is closed. On the other hand, when the ball valve body 51 is sucked into the tip side of the second passage portion 52b, the inner circumference of the tip of the second passage portion 52b is covered so that the ball valve body 51 does not block the second passage portion 52b. , Standing walls 52c that regulate the movement of the ball valve body 51 toward the second passage portion 52b are provided at intervals of, for example, 90 °.

The relief valve 1 of the present embodiment is incorporated into the hot water supply device in a posture in which the secondary side connection port 8 and the connection tool 53 (intake valve port 53b) of the intake valve 50 are on the lower side. Therefore, normally, the ball valve body 51 is in a state of closing the intake valve port 53b due to its own weight. On the other hand, when the pressure on the primary side becomes equal to or lower than the set negative pressure, the ball valve body 51 is sucked up to the vertical wall 52c at the tip of the second passage portion 52b by the negative pressure, and the intake valve port 53b is opened. As a result, the outside air enters the intake valve port 53b → the valve body accommodating chamber 53a → the inside of the intake pipe 52 (between the vertical walls 52c of the second passage portion 52b and the first passage portion 52a) → the secondary side connection port 8. It is sucked into the inside of the valve body 10 through the valve body 10. When the outside air is sucked into the valve body 10, the pressure response valve 20 opens and is sucked into the primary side.

A substantially cylindrical pressure adjusting member 45 is inserted into and screwed into the inner cylinder portion 18 of the upper case 10B, and a stepped shaft-shaped lifting valve shaft 41 is slidable on the pressure adjusting member 45. It is inserted. The pressure adjusting member 45 and the valve lifting shaft 41 are made of, for example, synthetic resin, and the outer diameter of the lower end portion of the pressure adjusting member 45 is smaller than that of the contacting member 32 (cylindrical portion) of the diaphragm valve body 30 described above. Its inner diameter (hole diameter of the lower small diameter hole 44b) (in other words, the outer diameter of the lower end portion of the lift valve shaft 41) is slightly smaller than the small diameter portion 21 of the pressure response valve 20 described above.

More specifically, the pressure adjusting member 45 is inserted into the inner cylinder portion 18 (in this example, it is inserted from the lower side), and the male screw portion 45a provided on the outer circumference of the pressure adjusting member 45 is the inner cylinder portion 18. It is attached to the inside of the inner cylinder portion 18 by being screwed into the female screw portion 18a provided on the inner peripheral middle abdomen. A rubber O-ring as a sealing material is provided between the pressure adjusting member 45 and the inner cylinder portion 18 (specifically, an annular groove provided below the male screw portion 45a on the outer circumference of the pressure adjusting member 45). 46 is attached. Further, in the upper end portion and the lower end portion of the pressure adjusting member 45, engaging grooves 47, 48 for rotating (screwing) the pressure adjusting member 45 with respect to the inner cylinder portion 18 (that is, the valve body 10). Is provided. Here, the engaging grooves 47 and 48 are formed, for example, in a cross shape or a straight line in a plan view.

Further, the inside of the pressure adjusting member 45 is formed with a stepped upper large diameter hole 44a having a relatively large diameter and a lower small diameter hole 44b having a relatively small diameter, and the valve lift shaft 41 has a relatively large diameter. A small-diameter shaft portion 41b having a relatively small diameter and a relatively long shape (in the vertical direction) is projected (integrally) below the large-diameter shaft portion 41a. The valve shaft 41 is adjusted so that the large-diameter shaft portion 41a is slidably fitted into the upper large-diameter hole 44a and the small-diameter shaft portion 41b is inserted into the lower small-diameter hole 44b. It is arranged inside the pressure member 45 so as to be movable up and down. A rubber O-ring 42 as a sealing material is provided between the lift valve shaft 41 and the pressure adjusting member 45 (specifically, an annular groove provided on the outer periphery of the upper large diameter portion 41a of the lift valve shaft 41). Is installed. Further, at the upper end of the lift valve shaft 41 (the large diameter shaft portion 41a), a slightly wide and substantially rectangular flat plate-shaped pedestal portion 41c that is brought into contact with the manual operation lever 60 attached above the valve shaft 41 is provided. .. The pedestal portion 41c is formed to be wider than the upper end portion of the pressure adjusting member 45, and when the manual operation lever 60 is operated (rotated) to push down the lifting valve shaft 41, the pedestal portion 41c is adjusted. It comes into contact with the upper end of the pressure member 45 (detailed later).

The upper part of the inner cylinder portion 18 (the portion above the female screw portion 18a) has an inner shape in order to avoid interference with the pedestal portion 41c when the lift valve shaft 41 is pushed down by the operation of the manual operation lever 60. Is formed slightly larger.

An outer peripheral step surface formed between the valve lift shaft 41 and the pressure adjusting member 45, more specifically, between the large diameter shaft portion 41a and the small diameter shaft portion 41b of the valve lifting shaft 41, and the upper portion of the pressure adjusting member 45. A compression coil spring 43 that constantly urges the lift valve shaft 41 upward (manually operated lever 60 side) contracts between the inner peripheral stepped surface formed between the large diameter hole 44a and the lower small diameter hole 44b. It is dressed up.

The pressure adjusting member 45 and the valve lifting shaft 41 inserted in the inner cylinder portion 18 are arranged coaxially with the pressure response valve 20 accommodated in the accommodating hole 13, and in a steady state (valve closed state), the pressure adjusting member 45 and the valve lifting shaft 41 are arranged. They are arranged facing each other at a predetermined distance from the upper end of the pressure response valve 20 (see FIG. 2).

Before inserting the lift valve shaft 41 into the pressure adjusting member 45, for example, using a tool such as a Phillips screwdriver or a minus driver, the pressure adjusting member 45 is inserted into the inner cylinder portion through the engaging groove 47 provided at the upper end portion. By rotating with respect to 18 (that is, the valve body 10), the pressure adjusting member 45 moves up and down accordingly, and the distance from the bottom surface of the pressure adjusting member 45 to the upper surface of the pressure response valve 20 is changed (adjusted). Will be done. By increasing the distance, the set pressure on the primary side until the pressure response valve 20 opens can be increased, and by decreasing the distance, the set pressure on the primary side until the pressure response valve 20 opens can be reduced.

That is, in this example, the female screw portion 18a formed on the inner circumference of the inner cylinder portion 18 of the valve body 10 and the female screw portion 18a formed on the outer periphery of the pressure adjusting member 45 inserted in the inner cylinder portion 18 The male threaded portion 45a screwed together constitutes a pressure adjusting mechanism 49 for adjusting the set pressure on the primary side until the pressure response valve (valve body) 20 is opened.

Further, the manually operated lever 60 has a U-shaped surface cut by a virtual plane including the central axis (center line) of the lift valve shaft 41, and a pair of U-shaped parallel flat plates. A pair of insertion grooves 61a that are inclined with respect to the central axis are provided inside the portion 61. A rotating shaft 10f projecting outward from a pair of mounting portions 10e erected on the ceiling portion 10c of the upper case 10B is inserted toward the back of the pair of insertion grooves 61a of the manual operation lever 60. Further, due to the compression coil spring 43 (the urging force) interposed between the pressure adjusting member 45 and the valve lift shaft 41, the upper surface of the pedestal portion 41c of the valve lift shaft 41 is set on the manually operated lever 60 (the pair of flat plates). It is pressed against the lower surface of a substantially rectangular pressing plate portion 62) provided between the portions 61. As a result, the manual operation lever 60 is rotatably attached to the rotary shaft 10f without the rotary shaft 10f coming off the insertion groove 61a. In this example, the manual operation lever 60 (pressing plate portion 62) and the valve lift shaft are rotated by turning the manual operation lever 60 clockwise or counterclockwise around the rotation shaft 10f on which the manual operation lever 60 is pivotally supported. The lift valve shaft 41 is pushed down (against the urging force of the compression coil spring 43) by the cam mechanism with 41 (the pedestal portion 41c), and the lower end of the lift valve shaft 41 is the small diameter portion 21 of the pressure response valve 20. The pressure response valve 20 is lowered in contact with the upper end, the valve seat 16 of the seal member 15 of the pressure response valve 20 is separated from the contact member 32 (lower surface) of the diaphragm valve body 30, and the pressure response valve 20 is opened. Is done.

That is, in this example, the forced valve opening mechanism 40 for forcibly opening the pressure response valve (valve body) 20 is configured by the valve lifting shaft 41 and the manually operated lever 60 described above.

<Operation of relief valve 1>
Hereinafter, the basic opening / closing operation of the relief valve 1 of the present embodiment having the above configuration will be outlined.

[Valve closed state]
As shown in FIG. 2, in the steady state (valve closed state), the valve lift shaft 41 (lower end) and the pressure adjusting member 45 (lower end) are separated from the upper end of the pressure response valve 20 at a predetermined distance and are separated from each other at a predetermined distance. The lower end of the lift valve shaft 41 is positioned slightly above the lower end of the pressure adjusting member 45.

[Valve open state]
As shown in FIG. 3, when the pressure on the primary side becomes equal to or higher than the set pressure, the diaphragm valve body 30 is pushed up by the pressure against the urging force of the second valve closing spring 34. On the other hand, the pressure response valve 20 is also pushed up by the pressure and the urging force of the first closing valve spring 12, but when the upper end of the small diameter portion 21 of the pressure response valve 20 comes into contact with the lower end of the pressure adjusting member 45, the pressure response valve 20 is also pushed up. The upward movement of the 20 is blocked, which causes the valve seat 16 of the seal member 15 to separate from the contacting member 32 and the pressure response valve 20 to open.

As a result, steam and hot water from the primary side are released from the primary side connection port 7 → accommodating hole 13 → gap between the valve seat 16 and the contact member 32 → gap between the small diameter portion 21 and the contact member 32 → The diaphragm operating chamber 14 → is discharged to the outside via the secondary side connection port 8. At this time, the ball valve body 51 is pressed against the intake valve port 53b, and the intake valve 50 is closed.

[Forced valve opening state (operation state)]
Further, when the pressure response valve 20 is temporarily (that is, only when the manual operation lever 60 is operated) forcibly opened in an emergency or maintenance inspection, as shown in FIG. The user holds the manual operation lever 60 and rotates it (rotates clockwise in the figure). As a result, the lift valve shaft 41 is pushed down by the cam mechanism between the manual operation lever 60 and the lift valve shaft 41 described above, and the lower end of the lift valve shaft 41 comes into contact with the upper end of the small diameter portion 21 of the pressure response valve 20. The pressure response valve 20 is lowered, the valve seat 16 of the seat member 15 is separated from the contacting member 32, and the pressure response valve 20 is forcibly opened.

In this example, the movement (amount) of the lift valve shaft 41 accompanying the operation of the manual operation lever 60 is restricted by the upper end portion of the pressure adjusting member 45 externally attached to the lift valve shaft 41. .. That is, the upper end portion of the pressure adjusting member 45 is a stopper portion that defines the downward movement limit of the lift valve shaft 41 (the movement limit of the lift valve shaft 41 with respect to the pressure response valve 20) by the operation of the manual operation lever 60.

As a result, steam and hot water from the primary side are discharged from the primary side connection port 7 → accommodating hole 13 → gap between the valve seat 16 and the contacting member 32 → small diameter portion 21 in substantially the same manner as described with respect to FIG. It is discharged to the outside through the gap between the contact member 32 and the diaphragm operating chamber 14 → the secondary side connection port 8. When the connecting pipe 9 of the secondary side connecting port 8 is connected to the air when the primary side has a negative pressure, the air from the outside is conversely the above, and the secondary side connecting port 8 to the primary side. When the air is sucked into the hot water storage tank via the connection port 7 and the connection pipe 9 of the secondary side connection port 8 is not connected to the atmosphere, the intake valve port 53b of the connector 53 → the valve body accommodating chamber 53a → the intake pipe. Inside 52 (between the vertical walls 52c of the second passage 52b and between the first passage 52a) → secondary side connection port 8 → diaphragm operating chamber 14 → gap between the small diameter portion 21 and the contacting member 32 → valve seat It is sucked into the hot water storage tank through the gap between 16 and the contacting member 32 → the accommodating hole 13 → the primary side connection port 7.

[Forced valve opening state (hold state)]
Further, when the pressure response valve 20 is forcibly opened and held (held) in an emergency or maintenance inspection, the manual operation lever 60 is rotated (counterclockwise in the figure) as shown in FIG. Rotate about 90 ° around). At this time, even if the user releases the manual operation lever 60, the manual operation lever 60 is held in that state without returning to the original position. As a result, the pressure response valve 20 is forcibly opened as described with respect to FIG. 4, and steam and hot water from the primary side are discharged to the outside via the same route as described above. ..

<Effect of relief valve 1>
In the relief valve 1 of the present embodiment having the above-described configuration, the forced valve opening mechanism 40 for forcibly opening the pressure response valve (valve body) 20 is movable with respect to the pressure response valve 20. It has a lift valve shaft 41 arranged and a manual operation lever 60 that acts on the lift valve shaft 41 to push down the lift valve shaft 41, and adjusts the set pressure on the primary side until the pressure response valve 20 is opened. The pressure adjusting member 45 is screwed and attached to the valve body 10, and the manually operated lever 60 does not directly act on the pressure adjusting member 45 when the pressure response valve 20 is forcibly opened. Therefore, deformation due to wear of the pressure adjusting member 45 and loosening of the screw of the pressure adjusting member 45 with respect to the valve body 10 are suppressed, so that the set pressure on the primary side can be changed until the pressure response valve 20 is opened. Can be suppressed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs are designed without departing from the spirit of the present invention described in the claims. You can make changes. For example, it goes without saying that each component constituting the relief valve 1 of the above-described embodiment may be made of an appropriate material other than the above-mentioned material.

1 Relief valve 7 Primary side connection port 8 Secondary side connection port 10 Valve body 10A Lower case 10B Upper case 12 First valve closing spring 13 Accommodating hole 14 Diaphragm operating chamber 15 Sealing member 16 Valve seat 16a Valve port 17 Outer cylinder part 18 Inner cylinder 18a Female thread 20 Pressure response valve (valve body)
21 Small diameter part 22 Large diameter part 30 Diaphragm valve body 31 Diaphragm 32 Contact member 33 Spring receiver 34 Second valve closing spring 40 Forced valve opening mechanism 41 Lifting valve shaft 43 Compression coil spring 45 Pressure regulating member 45a Male threaded part 47 Engagement groove (Upper end side)
48 Engagement groove (lower end side)
49 Pressure regulation mechanism 50 Intake valve 51 Ball valve body 52 Intake pipe 53 Connector 60 Manual operation lever

Claims (8)

It is arranged between the valve body having the primary side connection port and the secondary side connection port and the primary side connection port and the secondary side connection port, and opens when the pressure on the primary side exceeds the set pressure. It is a relief valve equipped with a valve body that releases the pressure on the primary side to the secondary side.
Forced opening having a valve shaft movably arranged with respect to the valve body and a manual operation lever acting on the valve shaft to push down the valve body in order to forcibly open the valve body. A valve mechanism is provided and
A pressure adjusting member for adjusting the set pressure on the primary side until the valve body is opened is screwed and attached to the valve body .
A relief valve characterized in that a compression coil spring is compressed between the pressure adjusting member and the valve lifting shaft. It is arranged between the valve body having the primary side connection port and the secondary side connection port and the primary side connection port and the secondary side connection port, and opens when the pressure on the primary side exceeds the set pressure. It is a relief valve equipped with a valve body that releases the pressure on the primary side to the secondary side.
Forced opening having a valve shaft movably arranged with respect to the valve body and a manual operation lever acting on the valve shaft to push down the valve body in order to forcibly open the valve body. A valve mechanism is provided and
A pressure adjusting member for adjusting the set pressure on the primary side until the valve body is opened is screwed and attached to the valve body .
The pressure adjusting member is provided with a stopper portion that defines the movement limit of the valve shaft with respect to the valve body when the valve shaft comes into contact with the pressure adjusting member when the valve shaft moves with respect to the pressure adjusting member. relief valve, characterized by that. The relief valve according to claim 1 or 2 , wherein the pressure adjusting member is inserted and screwed into an inner cylinder portion formed in the valve body along the opening / closing direction of the valve body. .. The relief valve according to any one of claims 1 to 3, wherein the pressure adjusting member has a tubular shape, and the lifting valve shaft is slidably inserted into the pressure adjusting member. .. The relief valve according to claim 2 , wherein a compression coil spring is compressed between the pressure adjusting member and the valve lifting shaft. The pressure regulating member, the relief valve according to claim 1, wherein a stopper portion defining a travel limit of the valve lifting axis with respect to said valve body is provided. The relief valve according to claim 2 or 6 , wherein the stopper portion is provided at the upper end portion of the pressure adjusting member. The relief valve according to claim 7 , wherein an engaging groove for rotating the pressure adjusting member with respect to the valve body is provided at the upper end portion of the pressure adjusting member.

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