JP2000088126A - Pressure relief valve for hot water supply facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure relief valve to perform regulation of a pressure by a slight force without being limited by a strong force spring for setting a pressure and perform accurate fine control. SOLUTION: A valve element 3 provided with a seat 30 formed of an elastic material is arranged on the under surface side of a vertically operating diaphragm 2 by sensing a pressure in a secondary chamber (w) on the upper surface side of a valve casing 1, and the valve element is depressed downward through the force of a spring 50 for setting a pressure. A vertical cylindrical part 12 communicated with a drain pipe 11 through a communication port 12a is arranged in a valve casing situated below the valve element, an inner cylindrical valve seat metal fitting 4 is vertically slidable fitted in a watertight state in the cylindrical part. A valve seat 40 is formed in an annular shape at the upper edge of the valve seat metal fitting 4 and a relief port (b) is formed at the inside thereof. Energization to the rising side is effected through the force of a weak spring located between the bottom wall of the cylindrical part and the support metal fitting 42 of the valve metal fitting, and a regulation bar 6 to regulate the end of rising operation of the valve seat metal fitting is vertically regulatably assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a pressure relief valve to be mounted on a boiler can or the like of a hot water supply facility.

[0002]

2. Description of the Related Art As shown in FIG. 1, a pressure relief valve A to be mounted on a boiler can or the like of a conventional hot water supply facility is usually provided on a top surface of a valve box 1 with a secondary boiler or the like. 2 which communicates with a connection pipe 10 provided in the valve box 1 so as to be connected to the side
A second chamber w is formed, and a diaphragm 2 that operates up and down by sensing the water pressure in the second chamber w is attached thereto, and a valve body that moves up and down together with the diaphragm 2 on the lower surface side of the diaphragm 2. The diaphragm 3 is formed integrally with the diaphragm material so as to be continuously formed therewith, or is formed separately and integrally mounted on the diaphragm 2 and is mounted on the lower surface side of the valve body 3. A sheet 30 made of material is provided, and a tubular portion 12 communicating with a drain pipe 11 provided in the valve box 1 is provided below the valve body 3 of the valve box 1, and is formed into a tubular shape inside the tubular portion 12. The valve seat metal fitting 4 is slidably fitted up and down and is pushed upward by a weak spring a, and the rising operation is performed by an enlarged diameter portion 4 a provided on the outer periphery of the valve seat metal fitting 4 and a cylindrical portion 12.
An annular valve seat 40 is formed on the upper end side of the valve seat fitting 4 so as to oppose the annular seat 30 provided on the valve body 3. A relief case b is formed on the inside of the valve case 1 and a spring case 5 is mounted on the outer surface side of the diaphragm 2 on the upper surface side of the valve box 1, and the valve body 3 mounted on the diaphragm 2 is mounted on the spring case 5. Valve seat 4
Assemble a pressure setting spring 50 that pushes down toward 0,
Further, an adjusting screw 51 for adjusting the spring pressure of the spring 50 is assembled.

When an abnormal pressure is generated on the side of the secondary chamber w, the diaphragm 2 rises, so that the valve element 3 is separated upward from the valve seat 40 provided on the valve seat fitting 4 and a relief port is provided. b is released to release the pressure to the outside, and in a normal state, the lower surface of the peripheral portion of the valve body 3 pushed down by the spring 50 abuts against a stopper S provided on the upper surface of the cylindrical portion 12 so that the valve body 3 is released. Of the valve body 3, and the valve seat 40 pushed up by the spring pressure of the weak spring a abuts against the annular seat 30 of the valve body 3 to prevent the seat 30 made of an elastic material from being damaged. I have to.

[0004]

The above-mentioned conventional means is used to regulate the ascending operation of the cylindrical valve washer 4 vertically incorporated into the valve box 1 to a predetermined position. The enlarged diameter portion 4a formed on the inner peripheral surface of the cylindrical portion 12 of the valve box 1 abuts on a projection 13 provided on the upper end side thereof. In order to assemble the valve seat metal fitting 4, it must be inserted from below the valve box 1, and other parts such as the valve body 3 and the diaphragm 2 of this valve seat metal fitting 4 are attached to the valve box 1. There is a problem that it takes time and effort to assemble because the assembly is performed from the upper surface side.

[0005] Further, the set pressure is adjusted by a spring 5 having a weak force.
Since the spring pressure of 0 is adjusted to be strong or weak, there is a problem that a force is required for the adjustment and fine adjustment is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem which has occurred in the conventional means, and a valve seat is vertically assembled to a valve box and urged upward by a weak spring. A seat made of an elastic material on the lower surface of a valve body which is formed on the upper end side of a cylindrical valve seat fitting and is mounted on the upper surface side of the valve box so as to move up and down together with a diaphragm operated by a secondary pressure. The valve seat fitting forming the valve seat can be assembled together with other parts such as the valve body from the upper surface side of the valve box, thereby facilitating the assembly. In addition, a new means is provided that allows fine adjustment to be performed precisely by adjusting the set pressure with a small force without being restricted by a spring with a strong force for setting the pressure. The purpose is to do.

[0007]

According to the present invention, as a means for achieving the above object, there are provided a connecting pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. A secondary chamber communicating with the connection pipe is formed on an upper surface side of a valve box having a valve body, and a diaphragm that senses pressure in the secondary chamber and operates up and down is attached to an outer surface side thereof, and a lower surface thereof is provided. A valve body is provided integrally or integrally with the diaphragm so as to move up and down together with the diaphragm, a sheet made of an elastic material is provided on the lower surface side of the valve body, and arranged on the outer surface side of the diaphragm to be assembled into a valve box. A pressure setting spring disposed in a spring case to be attached is pressed down by a pressure setting spring. In a valve box at a position below the valve body, an upper end communicates with the secondary chamber through an open port and a lower end communicates with a bottom wall. Up and down direction that communicates with the drain through the mouth At the time of lowering the valve body, the cylindrical body is provided with a peripheral portion of the opening above the cylindrical portion, and when the valve body is lowered, the lowering operation of the valve body is restricted at a predetermined position. A stopper is installed, and inside this tubular part,
An inner cylindrical valve seat is inserted into the cylindrical portion in a watertight manner and slidably fitted up and down, and the upper end of the valve seat is formed of an elastic material on the lower surface of the valve body. A valve seat facing the seat is formed in an annular shape, and a relief port is formed inside the valve seat, so that the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat bracket are formed. An adjusting rod for urging the valve spring upward in the upward direction by a weak spring interposed in the spring case, the cylindrical part or the valve box is provided with an adjusting rod for regulating the end of the ascending operation of the valve seat. ,
A pressure relief valve for a hot water supply facility is provided, wherein the pressure is adjusted by vertically adjusting the adjusting rod.

At the same time, a valve pipe having a connecting pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside is provided on the upper surface side of the valve box with the connecting pipe. A secondary chamber is formed, and a diaphragm which senses the pressure in the secondary chamber and operates up and down is mounted on the outer surface side thereof, and a valve body is integrally or integrally mounted on the lower surface side so as to move up and down together with the diaphragm. Provided, a sheet made of an elastic material is mounted on the lower surface side of the valve body, and is pressed down by a pressure setting spring disposed in a spring case arranged on the outer surface side of the diaphragm and assembled to the valve box, In the valve box at a position below the valve body, there is provided a vertical cylindrical portion having an upper end communicating with the secondary chamber through an open port and a lower end communicating with a drain pipe through a communication port provided in a bottom wall. The valve is provided on the periphery of the open port above the cylindrical portion. A stopper is provided to abut against the peripheral edge of the valve body at the time of the lowering operation and regulates the lowering operation of the valve body at a predetermined position.In this cylindrical portion, a valve seat fitting formed in an inner cylindrical shape is provided. The valve seat is inserted into the cylindrical portion in a watertight state and fitted slidably up and down, and a valve seat facing the seat made of an elastic material on the lower surface of the valve body is formed in an annular shape on the upper edge of the valve seat. A relief port is formed on the inner side thereof, and is attached to the ascending side by a weak spring interposed between the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat. In the spring case, an adjustment rod that penetrates the spring case up and down is attached to the spring case so that it can be adjusted up and down freely, and the lower end of the adjustment rod is set at the center of the valve body that is attached to the diaphragm. The watertightness is maintained in the through hole to be slid and inserted slidably, and the lower end of the adjustment rod A pressure relief valve for a hot-water supply facility, wherein the pressure is adjusted by vertically adjusting the adjusting rod so as to abut against the rising valve seat and regulate the end of the rising operation of the valve seat. To raise.

Further, a secondary chamber communicating with the connection pipe is formed on an upper surface side of a valve box having a connection pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. A diaphragm that senses the pressure in the secondary chamber and moves up and down is mounted on the outer surface thereof, and a valve body is integrally or integrally provided on the lower surface thereof so as to move up and down together with the diaphragm. A sheet made of an elastic material is mounted on the lower surface side of the diaphragm, and is pushed down by a pressure setting spring disposed in a spring case which is disposed on the outer surface side of the diaphragm and assembled to the valve box. In the valve box at the position
An upper end is provided with a vertical cylindrical portion which communicates with the secondary chamber through an opening, and a lower end communicates with a drain pipe through a communication opening provided in a bottom wall. On the periphery,
A stopper is provided for abutting against the peripheral edge of the valve body at the time of the lowering operation of the valve body and restricting the lowering operation of the valve body at a predetermined position, and a valve seat formed in an inner cylindrical shape is provided in the cylindrical portion. A metal fitting is inserted into the cylindrical portion in a watertight state and is fitted slidably up and down, and a valve seat opposed to a seat made of an elastic material on the lower surface of the valve body is formed on the upper edge of the valve seat metal fitting. And a relief port is formed in the inside of it, and it is raised by a weak spring interposed between the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat. A control rod that urges the valve seat to regulate the end of the upward movement of the valve seat is disposed in the valve seat, and the upper end thereof is vertically inserted into a through hole formed in the support of the valve seat. A restricting member that slidably fits in and abuts against the support fitting is provided at the upper end protruding upward from the through hole, The end side is vertically assembled to a mounting bracket provided in the bottom wall of the tubular portion or the valve box below the tubular portion so as to be vertically adjustable, and the pressure is adjusted by vertically adjusting the adjusting rod. It proposes a pressure relief valve for hot water supply facilities.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a valve box is provided with a connecting pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. Side, a secondary chamber w communicating with the connection pipe is formed, and a diaphragm that senses the pressure in the secondary chamber and operates up and down is mounted on the outer surface side of the secondary chamber, and on the lower surface side thereof. , A valve body is mounted so that it moves up and down together with its movement, a sheet made of an elastic material is provided on the lower surface of the valve body, and a pressure setting is provided in a spring case which is arranged on the outer surface side of the diaphragm and assembled to the valve box. The valve body is pushed down by a spring for use.

An opening on the upper end side communicates with the aforementioned secondary chamber at a position below this valve body in the valve box, and a lower end side communicates with the aforementioned drain pipe through a communication port provided on the bottom wall. A vertical cylindrical part is installed, and a cylindrical valve seat is inserted in a watertight state inside the cylindrical part, and this valve seat is interposed between the cylindrical part and the bottom wall of the cylindrical part by a weak spring. The valve seat is pushed upward so that the annular valve seat formed on the upper edge of the valve seat abuts against a sheet made of an elastic material provided on the lower surface of the valve body. Formed at the escape opening to open and close the inside.

A stopper is provided on the peripheral portion of the opening above the cylindrical portion to abut on the peripheral portion of the valve body depressed by the above-mentioned pressure setting spring and regulate the lowering operation of the valve body to a predetermined position. The valve body pushed down by the spring for pressure setting comes into contact with the stopper and the lowering operation is regulated, and the valve seat pushed up by the weak spring is set by the spring pressure of the weak spring. Try to get in touch.

In the valve box or the spring case, an adjusting rod for restricting the end of the upward movement of the cylindrical valve seat is provided, and the abutting position of the adjusting rod with respect to the valve seat is determined. The set pressure can be adjusted up and down by adjusting the adjustment rod up and down.

When this adjusting rod is installed inside a cylindrical valve seat, it is slidably fitted into a through hole formed in the center of the spring seat of the valve seat. The screw part formed on the lower end side is formed in the center of the bottom wall of the cylindrical part, or a screw hole formed in the valve box below the cylindrical part. Screwed into a screw hole to be mounted on the valve box and assembled to the valve box, and a retaining ring that abuts on the upper surface of the spring seat is fitted on the upper end side projecting upward from the spring seat, The lower end protruding into the drain pipe is moved up and down by rotating this adjustment rod with a tool such as inserting it into the drain pipe from below, and changing to the height position of the retaining ring, the end position of the rising operation of the valve washer Make changes to

In the case where the adjusting rod is provided on the spring case side to be assembled on the upper surface side of the valve box, the upper end side is screwed into the upper part of the spring case or a metal fitting integrated with the spring case, and the lower end side is formed as follows. The lower end of the valve is made by rotating the upper end protruding above the spring case by slidably inserting it into a through hole opened at the center of the valve body attached to the diaphragm, while maintaining watertightness, and projecting upward. Make sure that it appears on the underside of your body.

In this case, an adjusting screw cylinder is screwed into the upper part of the spring case, an adjusting rod is slidably fitted in the inner bore of the adjusting screw cylinder, and the lower end is provided with water through a through hole provided in the valve body. The holding member is slidably fitted and inserted, and a regulating member is fitted on the peripheral surface of the adjusting rod, and the regulating member is urged upward by a spring so as to abut the adjusting screw cylinder to force the adjusting rod. By pushing the valve in, the valve body also serves as a valve opening operation member for forcibly opening the valve body.

As described above, the valve opening operation member for forcibly opening the valve body is provided on the upper surface of the spring case when the adjusting rod is disposed in the lumen of the cylindrical valve washer. An operation lever may be provided on the side, and an operating rod that is raised and lowered by operation of the operation lever may be connected to the valve body, and the valve body may be forcibly lifted and opened by operating the operation lever.

[0018]

Next, an embodiment will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for components having the same effects as those of the conventional means.

FIG. 2 is a plan view of a pressure relief valve for a hot water supply facility embodying the present invention, and FIG. 3 is a longitudinal side view of the same, in which 1 is a valve box, and 10 is a boiler. A connecting pipe 11 connected to a secondary side of a can body or the like, a drain pipe 11 provided in the valve box 1 so as to release pressure to the outside, and a connecting pipe 10 provided on a side surface of the valve box 1, 11 for valve box 1
Is provided on the bottom side.

Reference numeral w denotes a secondary chamber provided on the upper surface side of the valve box 1 and communicates with the connection pipe 10 through a communication port 10a.

Reference numeral 2 denotes a diaphragm mounted on the outer surface side of the secondary chamber w so as to detect the water pressure in the secondary chamber w and operate up and down. The flange 5a of the peripheral edge of the spring case 5 to be assembled on the upper surface side of the valve case 1 is used as an assembling seat plate and fastened to the assembling seat on the peripheral edge of the upper surface of the valve box 1 to be assembled to the valve box 1.

Reference numeral 3 denotes a valve element incorporated on the lower surface side of the diaphragm 2, which is integrally formed with the diaphragm 2 by a material forming the diaphragm 2, and on the lower surface side thereof is made of an elastic material such as rubber. The seat 30 is provided annularly when viewed from below.

Reference numeral 50 denotes a pressure setting spring incorporated in the spring case 5 so as to push the valve body 3 downwardly in opposition to the water pressure in the secondary chamber w, and a spring receiving member provided on the outer surface of the diaphragm 2. It is stretched between the seat 31 and the inner surface of the ceiling of the spring case 5.

Numeral 12 designates a valve box 1 arranged below the valve body 3 and
A vertical tubular portion provided in the inside, and a drain pipe 11 is provided on the bottom side.
Is provided with a bottom wall 120 provided with a communication port 12a communicating with the bottom. A stopper S is formed at a peripheral portion of the opening above the cylindrical portion 12 so as to stop the lowering operation of the valve body 3 by the pressure setting spring 50 at a fixed position.

When the valve body 3 is lowered by the pressure setting spring 50 as described above, an abutting portion which comes into contact with the above-mentioned stopper S at a predetermined position is provided on the peripheral edge on the lower surface side. . A cutout groove 32 is formed in the abutting portion to allow the peripheral portion of the opening above the tubular portion 12 to communicate with the outside of the valve body 3 when in contact with the stopper S.

Reference numeral 4 denotes a valve seat fitting which is inserted into the lumen of the above-mentioned cylindrical portion 12 and is formed in a cylindrical shape. An opposed annular valve seat 40 is formed and formed at a relief opening b inside the annular valve seat 40.

The valve metal fitting 4 is inserted into the tubular portion 12 in a watertight manner so as to be slidable up and down in the tubular portion 12.
An O-ring 41 is interposed between the outer peripheral surface thereof and the inner peripheral wall of the cylindrical portion 12 to maintain watertightness therebetween.

Reference numeral a denotes a weak spring that pushes up the valve fitting 4 described above, and is stretched between the support fitting 42 provided in the lumen of the valve fitting 4 and the bottom wall 120 of the tubular portion 12. .

Reference numeral 6 denotes an adjustment rod for regulating the set pressure by restricting the upward movement of the valve seat 4 by the spring a at a desired position. It is screwed into a screw hole 121 provided in the bottom wall 120 of the shaped part 12, assembled to the valve box 1 so as to move up and down by rotation, and the upper end side is formed at the center of the support fitting 42 of the valve seat fitting 4. A regulating member 60 such as an E-ring having a larger diameter than the through hole is fitted on the upper end protruding upward from the through hole so as to be vertically slidably inserted into the hole, and is pushed up by the spring a. The upper surface of the supporting member 42 of the washer 4 is
It stops when it comes into contact with 0.
The stop position can be changed and adjusted by inserting a tool such as a screwdriver from the drain pipe 11 and rotating the lower end of the adjusting rod 6 to move the adjusting rod 6 up and down.

Reference numeral 7 denotes an operating member for forcibly opening the valve body 3 by manual operation. The operating member 7 is provided on the upper surface of the spring case 5 so as to swing up and down around a fulcrum shaft 70 which is vertically movable. The upper end of an operating rod 71 is axially connected to the shaft 70, the lower end of the operating rod 71 penetrates into the spring case 5, and the lower end is connected to the valve body 3. , The valve body 3 is lifted and opened.

In this embodiment, the valve seat 4 is pushed up by the spring a on the seat 30 on the lower surface of the valve body 3 in which the lowering operation is stopped when the abutment portion comes into contact with the stopper S in the normal state. The abutment of the valve seat 40 at the upper end edge of the rim keeps the normal state in which the escape port b is closed as shown in FIG.

In this state, when the water pressure in the secondary chamber w rises and the diaphragm 2 is pushed up, the valve seat metal fitting 4 rises following the valve body 3 which rises by this, and the relief port b continues. Is kept closed.

The follow-up of the valve seat 4 is caused by the support fitting 4
2 is carried out until the upper surface of the abutment 2 abuts on the regulating member 60 of the adjusting rod 6 and the elevation from that position is regulated. And FIG.
In the state where the upper surface of the support fitting 42 abuts on the regulating member 60 as shown in FIG. 4, the water pressure in the secondary chamber w further increases and the valve body 3 moves up together with the diaphragm 2, whereby the valve seat 4
The valve body 3 is separated from 0 and opens to open the relief port b.

That is, the water pressure in the secondary chamber w in the state where the raising operation of the valve seat 4 is regulated by the adjusting rod 6 corresponds to the set pressure at which the hydraulic pressure is opened. Is adjusted by raising and lowering.

In this embodiment, the operating member 7 is operated to pull up the operating rod 71, thereby forcibly opening the valve as shown in FIG.

FIGS. 6 to 9 show another embodiment. This embodiment is an example in which the adjusting rod 6 is provided on the side of the spring case 5 to be assembled on the upper surface side of the valve box 1. The configuration excluding this point is the embodiment shown in FIGS. 2 to 5 described above. There is no change.

That is, the valve box 1 is provided with a connecting pipe 10 on the side face, a drain pipe 11 on the bottom face, and a secondary chamber w communicating with the connecting pipe 10 via the communication port 10a on the upper face side. The diaphragm 2 is mounted on the outer surface of the secondary chamber w, the valve 3 is mounted on the lower surface thereof, and the valve 3 is mounted in the spring case 5 mounted on the upper surface of the valve box 1. It is pushed down by the pressure setting spring 50 provided.

The body of the valve box 1 has a cylindrical portion 12 vertically penetrating through a portion located below the valve body 3.
Is formed in a form having a bottom wall 120 with a communication port 12a, and a stopper S is formed at the periphery of the open port above the stopper so as to come into contact with the abutment formed on the periphery of the valve body 3. A cylindrical valve seat fitting 4 is inserted into the cylindrical portion 12 from an upper opening, and is pushed upward by a weak spring a. The formation of the annular valve seat 40 facing the seat 30 provided with the elastic material is the same as that of the above-described embodiment.

However, on the top of the spring case 5, an adjusting screw 8 formed in a cylindrical shape is provided with a screw 8 provided on the outer peripheral surface thereof.
The adjusting rod 6 is slidably inserted up and down into the bore of the screw.

The lower end of the adjusting rod 6 penetrates through the center of the spring case 5 and fits through a watertight holding member 82 into a sleeve 81 provided at the center of the valve body 3. , The lower end from the opening below the sleeve 81,
It protrudes and retracts with respect to the valve metal fitting 4 located thereunder.

The adjusting rod 6 has a regulating member 60 which is fitted to the lower surface of the adjusting screw 8 at an intermediate portion of the body portion thereof, and is fitted to the regulating member 60 on the upper surface of the diaphragm 2. A spring c is stretched between the spring receiving seat 31 and the regulating member 60 so that the regulating member 60 is held at a position where it abuts against the lower surface of the adjusting screw 8 in a normal state. An operation member 7 for pushing operation is attached to an upper end projecting upward.

In this embodiment, normally, the valve body 3 and the valve seat 4 are held at the state shown in FIG. 7 and are formed inside the valve seat 40 at the upper end edge of the valve seat 4. The escape port b is kept closed.

In this state, when the valve body 3 rises together with the diaphragm 2 due to an increase in the water pressure in the secondary chamber w, the lower end of the adjusting rod 6 gradually projects downward from the lower opening of the sleeve 81. It comes into contact with the upper surface of the support fitting 42 of the valve seat fitting 4 which rises following the valve element 3.

When the valve body 3 further rises from the state in which the abutment has been performed by increasing the water pressure, the annular seat 30 on the lower surface of the valve body 3 separates from the valve seat 40 as shown in FIG. The valve is in an open state in which the relief port b is opened. Then, the water pressure in the secondary chamber w when the valve is opened becomes the set pressure, and the set pressure is adjusted by turning the adjusting screw 8 and moving the adjusting rod 6 up and down. .

When the operating member 7 is pushed downward against the spring pressure of the spring c in the state shown in FIG. 7, the valve seat 40 moves downward together with the valve seat fitting 4 as shown in FIG. A forced valve opening is performed.

[0046]

As described above, the pressure relief valve for the hot water supply facility according to the present invention is operated up and down by the pressure in the secondary chamber w on the upper surface side of the valve box 1 and the spring 50 opposed to the pressure. The diaphragm 2 to be assembled, the valve body 3 to be moved up and down together therewith, the cylindrical valve seat 4 to be movably opposed to the valve 3, and the upper end edge of the valve seat 4 Since a weak spring a or the like for contacting the valve seat 40 with the seat 30 made of an elastic material on the lower surface of the valve body 3 is attached to the valve box 1 from above, assembly of these parts becomes easy. The adjustment of the set pressure can be performed by moving the adjustment rod 6 up and down, which is not affected by the spring 5 that pushes the diaphragm 2 downward while pressing the diaphragm 2 against the pressure in the secondary chamber w. Fine adjustment of pressure can be performed accurately.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a conventional pressure relief valve for a hot water supply facility.

FIG. 2 is a plan view of a pressure relief valve for a hot water supply facility embodying the present invention.

FIG. 3 is a vertical sectional front view of the pressure relief valve.

FIG. 4 is a longitudinal sectional front view when the pressure relief valve is forcibly opened.

FIG. 5 is an explanatory diagram of an operation of the pressure relief valve.

FIG. 6 is a plan view of another embodiment of the pressure relief valve.

FIG. 7 is a vertical sectional front view of the embodiment.

FIG. 8 is an explanatory diagram of the operation of the embodiment.

FIG. 9 is an explanatory diagram of a state where the valve is forcibly opened according to the embodiment.

[Explanation of symbols] A: pressure relief valve, S: stopper, a: weak spring, b:
Release port, c: strong spring, w: secondary chamber, 1 ... valve box, 10 ...
Connection pipe, 10a: communication port, 11: drain pipe, 12: tubular part, 12a: communication port, 120: bottom wall, 121: screw hole,
13 ... Projection, 2 ... Diaphnum, 2a ... Peripheral part, 3 ...
Valve element, 30 ... seat, 31 ... spring seat, 32 ... notch groove,
Reference numeral 4: valve seat fitting, 4a: enlarged diameter portion, 40: valve seat, 41: O-ring, 42: support fitting, 5: spring case, 5a: flange portion,
Reference numeral 50: spring, 51: adjusting screw, 6: adjusting rod, 60: regulating member, 7: operating member, 70: fulcrum shaft, 71: operating rod, 8
... adjustment screw, 80 ... screw part, 81 ... sleeve, 82 ... watertight holding member.

Claims (3)

[Claims] 1. A secondary chamber communicating with the connection pipe is formed on an upper surface side of a valve box having a connection pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. A diaphragm that senses the pressure in the secondary chamber and moves up and down is mounted on the outer surface thereof, and a valve body is integrally or integrally provided on the lower surface thereof so as to move up and down together with the diaphragm. A sheet made of elastic material is installed on the lower side of
A pressure setting spring disposed in a spring case which is disposed on the outer surface side of the diaphragm and assembled to the valve box pushes down the valve body. A vertical tubular portion communicating with the next chamber and having a lower end communicating with the drain pipe through a communication port provided on the bottom wall is provided, and the valve body is provided at a peripheral portion of an open port above the cylindrical portion. A stopper is provided to abut against the peripheral edge of the valve body at the time of the lowering operation and regulates the lowering operation of the valve body at a predetermined position.In this cylindrical portion, a valve seat fitting formed in an inner cylindrical shape is provided.
The valve seat is inserted into the cylindrical portion in a watertight state and fitted slidably up and down, and a valve seat facing the seat made of an elastic material on the lower surface of the valve body is formed in an annular shape on the upper edge of the valve seat. A relief port is formed on the inner side thereof, and is attached to the ascending side by a weak spring interposed between the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat. And an adjusting rod for regulating the end of the ascending operation of the valve seat fitting is provided on the mounting bracket provided in the spring case or the cylindrical portion or the valve box.
A pressure relief valve for a hot water supply facility, wherein the pressure relief valve is assembled so as to be adjustable up and down, and the pressure is adjusted by adjusting the adjustment rod up and down. 2. A secondary chamber communicating with the connection pipe is formed on an upper surface side of a valve box including a connection pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. A diaphragm that senses the pressure in the secondary chamber and moves up and down is mounted on the outer surface thereof, and a valve body is integrally or integrally provided on the lower surface thereof so as to move up and down together with the diaphragm. A sheet made of elastic material is installed on the lower side of
A pressure setting spring disposed in a spring case which is disposed on the outer surface side of the diaphragm and assembled to the valve box pushes down the valve body. A vertical tubular portion communicating with the next chamber and having a lower end communicating with the drain pipe through a communication port provided on the bottom wall is provided, and the valve body is provided at a peripheral portion of an open port above the cylindrical portion. A stopper is provided to abut against the peripheral edge of the valve body at the time of the lowering operation and regulates the lowering operation of the valve body at a predetermined position.In this cylindrical portion, a valve seat fitting formed in an inner cylindrical shape is provided.
The valve seat is inserted into the cylindrical portion in a watertight state and fitted slidably up and down, and a valve seat facing the seat made of an elastic material on the lower surface of the valve body is formed in an annular shape on the upper edge of the valve seat. A relief port is formed on the inner side thereof, and is attached to the ascending side by a weak spring interposed between the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat. In the spring case, an adjustment rod that penetrates the spring case up and down is attached to the spring case so that it can be adjusted up and down freely, and the lower end of the adjustment rod is opened at the center of the valve body that is assembled to the diaphragm. The watertightness is maintained in the through hole to be slid and inserted slidably,
The lower end of the adjusting rod comes into contact with the ascending valve seat fitting to regulate the end of the ascending operation thereof, and the pressure is adjusted by adjusting the adjusting rod up and down. Pressure relief valve. 3. A secondary chamber communicating with the connection pipe is formed on an upper surface side of a valve box having a connection pipe connected to a secondary side such as a boiler can body and a drain pipe for releasing pressure to the outside. A diaphragm that senses the pressure in the secondary chamber and moves up and down is mounted on the outer surface thereof, and a valve body is integrally or integrally provided on the lower surface thereof so as to move up and down together with the diaphragm. A sheet made of elastic material is installed on the lower side of
A pressure setting spring disposed in a spring case which is disposed on the outer surface side of the diaphragm and assembled to the valve box pushes down the valve body. A vertical tubular portion communicating with the next chamber and having a lower end communicating with the drain pipe through a communication port provided on the bottom wall is provided, and the valve body is provided at a peripheral portion of an open port above the cylindrical portion. A stopper is provided to abut against the peripheral edge of the valve body at the time of the lowering operation and regulates the lowering operation of the valve body at a predetermined position.In this cylindrical portion, a valve seat fitting formed in an inner cylindrical shape is provided.
The valve seat is inserted into the cylindrical portion in a watertight state and fitted slidably up and down, and a valve seat facing the seat made of an elastic material on the lower surface of the valve body is formed in an annular shape on the upper edge of the valve seat. A relief port is formed on the inner side thereof, and is attached to the ascending side by a weak spring interposed between the bottom wall of the tubular portion or the mounting bracket integrated with the bottom wall and the support bracket of the valve seat. An adjustment rod that regulates the end of the upward movement of the valve washer is disposed inside the valve washer, and the upper end thereof is vertically slidable in a through hole formed in the support of the valve washer. A regulating member is provided at the upper end protruding upward from the through-hole to abut against the support fitting, and the lower end is inserted into the bottom wall of the tubular portion or the valve box below the tubular portion. It is characterized in that it is assembled to the mounting bracket so that it can be adjusted up and down, and the pressure is adjusted by adjusting the adjustment rod up and down. Pressure relief valve for hot water facility.