JP2009097651A - Emergency shut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency shut-off valve capable of blocking a secondary pressure by closing a flow channel of secondary side piping of a high pressure reducing valve before the secondary pressure of the high pressure reducing valve becomes excessive. <P>SOLUTION: The emergency shut-off valve comprises a casing in which the flow channel is formed inside, a valve element to open and close the flow channel, a first spring to energize the valve element in the valve closing direction, a stopper to hold the valve element in the valve opening state after engaging the valve element, and a pressure-sensitive member which abuts the stopper to urge the stopper to be engaged with the valve element and can move in a direction for allowing release of engagement between the stopper and the valve element upon detecting the flow channel inner pressure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an emergency shutoff valve attached to a secondary side pipe of a high pressure reducing valve.

In a water heater having a can body, for example, as disclosed in Patent Document 1, a pressure reducing valve is disposed on the upstream side of the can body. As the building heightened, the pump pressure increased, and the pressure reducing valve of the water heater arranged on the lower floor was applied with a much higher primary pressure than before. For this reason, the hot water heater provided on the lower floor of a high-rise building is provided with a high pressure reducing valve having a large amount of reduced pressure.
Japanese Patent Laid-Open No. 10-132375

There is a possibility that the high pressure reducing valve may malfunction due to exhaustion of the valve body due to deterioration over time or clogging of dust between the valve body and the valve seat. Cans and various valves arranged downstream of the high pressure reducing valve Excessive pressure may act on the mechanism, etc., possibly damaging these devices.
The present invention has been made in view of the above problems, and shuts off the secondary pressure by closing the flow path of the secondary piping of the high pressure reducing valve before the secondary pressure of the high pressure reducing valve becomes excessive. The purpose is to provide an emergency shut-off valve.

In order to solve the above problems, in the present invention, a casing having a flow path formed therein, a valve body that opens and closes the flow path, a first spring that biases the valve body in a valve closing direction, and a valve A stopper that engages the body and holds the valve body in an open state, and abuts against the stopper to urge the stopper to engage the valve body, and detects the internal pressure of the flow path to detect the engagement between the stopper and the valve body. An emergency shut-off valve is provided that includes a pressure-sensitive member that is movable in a direction that permits release.
The emergency shut-off valve according to the present invention is attached to the secondary side piping of the high pressure reducing valve.
When the high-pressure pressure reducing valve operates normally and the secondary pressure is maintained at an appropriate value, the pressure-sensitive member urges the stopper to engage the valve body. As a result, the valve body is maintained in an open state, the flow path in the casing is opened, and the can body and various valve mechanisms disposed downstream of the high pressure pressure reducing valve are suitable for the high pressure pressure reducing valve. Secondary pressure is acting.
When the secondary pressure rises due to a malfunction of the high-pressure pressure reducing valve, the pressure-sensitive member that senses the increase in the secondary pressure moves in a direction that allows disengagement between the stopper and the valve body, and the secondary pressure Before the pressure becomes excessive, it reaches a position that allows disengagement between the stopper and the valve body. The engagement between the stopper and the valve body is released, the valve body receiving the urging force of the first spring is closed, the flow path in the casing is closed, and the secondary pressure is shut off. As a result, it is possible to prevent a situation in which an excessive secondary pressure of the high pressure reducing valve acts on a can body, various valve mechanisms, and the like disposed on the downstream side of the high pressure reducing valve.

In a preferred embodiment of the present invention, a primary side flow path, a secondary side flow path, and a valve hole for communicating the primary side flow path with the secondary side flow path are formed in the casing, and the valve body is on the primary side flow path side. Open and close the valve hole.
By disposing the valve body on the primary flow path side, it is possible to prevent the dynamic pressure of the fluid passing through the valve hole from being applied to the valve body and preventing the valve body from moving in the valve closing direction.

In a preferred embodiment of the present invention, the stopper is a ball member that can be engaged with a groove having an inverted trapezoidal cross section formed in the valve body.
If the ball member that can be engaged with the groove of the inverted trapezoidal cross section whose open end width is wider than the bottom width is a stopper, the pressure-sensitive member moves in a direction that allows disengagement between the stopper and the valve body. Corresponding to the above, since the valve body biased by the first spring can move in the valve closing direction while removing the ball member from the groove without hindrance, the pressure sensitive member disengages the stopper and the valve body. At the same time, the valve body can be immediately closed with the ball member completely removed from the groove. As a result, the responsiveness of the emergency shutoff valve is improved.

In a preferred embodiment of the present invention, the stopper and the pressure-sensitive member are integrated, and the stopper has a spherical portion that can be engaged with a groove having an inverted trapezoidal cross section formed in the valve body.
If the stopper and the pressure-sensitive member are integrated, the engagement state between the stopper and the valve body is released at the same time when the pressure-sensitive member reaches a position allowing the stopper and the valve body to be disengaged. Since the spherical portion of the stopper engages with the groove of the inverted trapezoidal cross section formed in the valve body, the pressure sensitive member can move without any trouble in a direction allowing the stopper and the valve body to be disengaged. By integrating the stopper and the pressure sensitive member, the number of parts is reduced.

In a preferred aspect of the present invention, the pressure-sensitive member includes a piston assembly having two piston heads having different pressure receiving areas for sensing the internal pressure of the flow path, and a piston rod connecting the two piston heads, and a piston assembly. And a second spring for biasing the stopper toward the stopper.
The piston assembly functions as a pressure-sensitive member that senses and moves the internal pressure of the flow path by communicating the space between two piston heads with different pressure receiving areas for detecting the internal pressure of the flow path with the flow path formed in the casing. Can be made. When the flow path internal pressure is within the proper range, the piston assembly that has received the biasing force of the second spring abuts against the stopper and biases the stopper to engage the valve body.

In a preferred aspect of the present invention, the emergency shut-off valve includes an alarm member that protrudes out of the casing in conjunction with the movement of the pressure-sensitive member in the direction allowing disengagement between the stopper and the valve body.
By protruding the alarm member out of the casing, the user of the water heater can recognize the failure of the pressure reducing valve for high pressure. If the alarm member that protrudes outside the casing turns on the limit switch and activates alarm means such as an alarm buzzer or an alarm lamp, the user of the water heater can immediately detect the failure of the high-pressure pressure reducing valve. And it can be recognized reliably.

In a preferred aspect of the present invention, the emergency shut-off valve includes a return member that engages with the valve body and receives an external force to return the valve body in the closed state to the valve open state.
By disposing the return member, the emergency shut-off valve can be easily returned to the open state manually after the high-pressure pressure reducing valve is repaired.

The present invention provides an emergency shut-off valve that shuts off the secondary pressure of the high pressure reducing valve before the secondary pressure of the high pressure reducing valve becomes excessive.

As shown in FIG. 1, a water heater A having a can body is disposed sequentially from the upstream to the downstream with respect to a first pipe 1 through which water or hot water flows during hot water supply and a water flow through the first pipe 1 during hot water supply. A check valve 2a connected to one pipe, a high pressure reducing valve 3, a hot water storage tank 4 having a heater, a relief valve 5 having a negative pressure operating function, a check valve 2b, and a hot water mixing valve 6; A portion extending from the high-pressure pressure reducing valve 3 of the first pipe 1 is connected to the lower end of the hot water storage tank 4, and a portion extending from the hot water storage tank 4 of the first pipe 1 extends from the top of the hot water storage tank 4. A drain valve 7 is connected to a portion extending in the vicinity of the lower end of the hot water storage tank 4, and further branched from a portion extending between the high pressure reducing valve 3 and the hot water storage tank 4 of the first pipe 1 to mix the hot water and water 6. A second pipe 8 that is connected to the cold water inlet of the water and through which water flows when hot water is supplied, and a second pipe 8 that supplies water when hot water is supplied And a check valve 2c connected to the second pipe 8 is disposed upstream of the hot and cold water mixing valve 6 with respect to water flow. The first pipe 1 extends further downstream from the hot / cold water mixing valve 6 and is connected to a water discharge device 100 such as a shower head or a bathtub water discharge port. An electromagnetic valve 9, check valves 2d and 2d, and an edge cut valve 10 are disposed in the middle of the first pipe 1 extending from the hot and cold mixing valve 6 to the bathtub. The relief valve 5 is connected to the drain port of the drain valve 7 via the drain hose 1 ′. Below the drain valve 7, a drain port of a water heater installation location (not shown) is disposed.
An emergency shut-off valve 20 is disposed in a portion of the first pipe 1 downstream of the high pressure decompression 3 and upstream of the branch portion of the second pipe 8.

In the water heater A, when hot water is supplied, tap water flows into the lower part of the hot water storage tank 4 through the first pipe 1, the check valve 2 a and the high pressure reducing valve 3, and hot water flows out from the top of the hot water storage tank 4. Then, it flows into the hot water inlet of the hot water mixing valve 6 through the first pipe 1 and the check valve 2b. The tap water flows into the cold water inlet of the hot water mixing valve 6 through the second pipe 8 and the check valve 2c. Hot water and cold water are mixed in the hot / cold water mixing valve 6, hot water having an appropriate temperature flows out of the hot / cold water mixing valve 6, and water is discharged from the water discharge device 100 through the first pipe 1.
When the pressure in the hot water storage tank 4 exceeds the appropriate value, the relief valve 5 opens and discharges high-pressure steam or hot water through the drainage hose 1 'to the outside of the water heater A, so that the pressure in the hot water storage tank 4 reaches the appropriate value. Reduce.
The check valve 2a prevents the back flow of hot water from the water heater A to the upstream water pipe, and the check valves 2b, 2c, and 2d are upstream of the hot water storage tank 4 and the hot water storage tank 4 from the water discharge device 100 side. Back flow of hot water to the first pipe 1 on the side is prevented.
When the negative pressure is generated in the hot water storage tank 4, the edge cut valve 10 opens the first pipe 1 downstream from the edge cut valve 10 to the atmosphere, and even if the check valves 2b, 2c, and 2d are broken, The internal hot water is prevented from flowing back to the hot water storage tank 4.
When the water heater A is not used for a long period of time, the drain valve 7 is opened, and the water in the hot water storage tank 4 is drained from the drain port of the drain valve 7 with the drain hose 1 'and the relief valve 5 having a negative pressure operating function. While replacing the air flowing into the hot water storage tank 4 through the first pipe 1, the hot water storage tank 4, the first pipe 1 extending between the hot water storage tank 4 and the check valve 2b, the first pipe 1 from It drains from the 2nd piping 8 extended between the branch point and the non-return valve 2c, and the 1st piping 1 extended between the branch point of the 2nd piping 8, and the hot water storage tank 4. FIG.

As shown in FIG. 2, the emergency shut-off valve 20 is formed with a primary side flow path 201a, a secondary side flow path 201b, and a valve hole 201c for communicating the primary side flow path 201a with the secondary side flow path 201b. The casing 201 is provided. The primary side flow path 201a is connected to the secondary side flow path of the high pressure reducing valve 3 via the first pipe 1, and the secondary side flow path 201b is connected to the hot water storage tank 4 via the first pipe 1. The first valve 1 and the second pipe 8 are connected to the check valve 2c.
A valve shaft 202a that is slidably inserted into a cylindrical opening 201d formed in the casing 201, and a valve that is formed at one end of the valve shaft 202a and that is disposed in the primary channel 201a and faces the valve hole 201c. A valve body 202 having a portion 202b is disposed. Separation of the valve body 202 from the cylindrical opening 201d is prevented. The sliding contact portion between the valve shaft 202 a and the cylindrical opening 201 d surrounding wall is sealed by an O-ring 203. A circumferential groove 202c having an inverted trapezoidal cross section whose open end width is wider than the bottom width is formed in the valve shaft 202a. A first spring 204 that urges the valve portion 202b and thus the valve body 202 in the valve closing direction is disposed in the primary flow path 201a. One end of a return lever 205 is rotatably attached to the other end of the valve shaft 202a that protrudes out of the casing 201.

A cylindrical opening 201e perpendicular to the cylindrical opening 201d is formed in the casing 201. The cylindrical opening 201e has a small-diameter cylindrical opening 201e ′ in the vicinity of the communicating portion with the cylindrical opening 201d, and a large-diameter cylindrical opening 201e ″ separated from the cylindrical opening 201d.
A piston assembly 206 is slidably inserted into the cylindrical opening 201e. The piston assembly 206 has a small-diameter piston head 206a inserted into the small-diameter cylindrical opening 201e ′, a large-diameter piston head 206b inserted into the large-diameter cylindrical opening 201e ″, and a piston rod 206c that connects the two. O-rings 207 and 208 seal the sliding contact portion between the small-diameter piston head 206a and the small-diameter cylindrical opening 201e ′ and the sliding contact portion between the large-diameter piston head 206b and the large-diameter cylindrical opening 201e ″. Has been. A space 209 formed by a portion extending between the small-diameter piston head 206a and the large-diameter piston head 206b of the small-diameter cylindrical opening 201e ′ and the large-diameter cylindrical opening 201e ″ communicates with the primary channel 201a. A second spring 210 that urges the piston assembly 206 toward the cylindrical opening 201d is disposed in the large-diameter cylindrical opening 201e ″. One end of the second spring 210 is in contact with the large-diameter piston head 206b, and the other end is in contact with the adjustment member 211 that is screwed into the open end of the large-diameter cylindrical opening 201e ″. An end portion of the extending pin 212 enters the central hole of the adjustment member 211.
A pressure-sensitive member 213 is formed by the piston assembly 206 and the second spring 210.
A ball member 214 that contacts the small-diameter piston head 206a of the piston assembly engages with the circumferential groove 202c of the valve shaft 202.

The operation of the emergency shutoff valve 20 will be described.
When the high-pressure pressure reducing valve 3 operates normally and the secondary pressure of the high-pressure pressure reducing valve 3 is maintained at an appropriate value, the piston assembly 206 has the second spring 210 as shown in FIG. Under the urging force, the ball member 214 is urged in a direction approaching the cylindrical opening 201d, and the ball member 214 is engaged with the circumferential groove 202c of the valve body 202. As a result, the valve portion 202b opens the valve hole 201c and the valve body 202 is maintained in the open state, and the hot water storage tank 4, the check valve 2c, the hot water disposed on the downstream side of the high pressure reducing valve 3 are provided. An appropriate secondary pressure of the high pressure reducing valve 3 acts on the mixing valve 6 and the like.
When the secondary pressure of the high-pressure pressure reducing valve 3 increases due to malfunction of the high-pressure pressure reducing valve 3 due to exhaustion of the valve body due to deterioration over time or clogging of dust between the valve body and the valve seat, etc. The piston assembly 206 having the piston heads 206b and 206a senses the increase in the secondary pressure and, as shown in FIG. 2 (b), resists the urging force of the second spring 210 from the cylindrical opening 201d. It moves in the direction of separating, that is, in the direction allowing disengagement between the ball member 214 and the circumferential groove 202c. Corresponding to the movement of the piston assembly 206 in a direction allowing the disengagement between the ball member 214 and the circumferential groove 202c, the valve body 202 biased by the first spring 204 causes the ball member 214 to be trapped trapezoidally. It moves in the valve closing direction while eliminating from the circumferential groove 202c of the cross section without any trouble.
The piston assembly 206 reaches a position that allows disengagement between the ball member 214 and the circumferential groove 202c before the secondary pressure becomes excessive. The ball member 214 is completely removed from the circumferential groove 202c, and the valve portion 202b of the valve body 202, which has received the urging force of the first spring 204, immediately closes the valve hole 201c, and the valve body 202 is closed. 3 secondary pressure is cut off. Since the valve part 202b is arrange | positioned in the primary side flow path 201a, it does not receive the dynamic pressure of the fluid which passes the valve hole 201c. Therefore, there is no possibility that movement of the valve body 202 in the valve closing direction is hindered by the dynamic pressure. The hot water storage tank 4 disposed on the downstream side of the high pressure reducing valve 3 by closing the valve body 202 with the valve portion 202b closing the valve body 202 and shutting off the secondary pressure of the high pressure reducing valve 3; Occurrence of an excessive secondary pressure of the high pressure reducing valve 3 on the check valve 2c, the hot and cold mixing valve 6 and the like is prevented.
By adjusting the screwing amount of the adjusting member 211 and adjusting the urging force of the second spring 210, the operating pressure of the emergency shutoff valve 20 at which the valve portion 202b closes the valve hole 201c can be adjusted.

In conjunction with the movement of the piston assembly 206 in the direction allowing the disengagement between the ball member 214 and the circumferential groove 202c, the pin 212 protrudes out of the casing 201 as shown in FIG. . By visually observing that the pin 212 protrudes out of the casing 201, the user of the water heater A can recognize the failure of the pressure reducing valve 3 for high pressure. If the pin 212 projecting out of the casing 201 turns on the limit switch and activates an easily recognizable alarm means such as an alarm buzzer or an alarm lamp, the user of the water heater A can A failure can be recognized immediately and reliably.
When the valve body 202 moves in the valve closing direction under the urging force of the first spring 204, the release lever 205 comes into contact with the convex portion formed in the casing 201, and FIG. The release lever 205, which has been sleeping as shown in a), rotates and rises as shown in FIG. After the high pressure reducing valve 3 is repaired, the raised return lever is manually rotated and laid down, whereby the ball member 214 biased by the piston assembly 206 is reengaged with the circumferential groove 202c of the valve body 202. The emergency shutoff valve 20 can be easily returned to the open state.

The piston assembly 206 and the ball member 214 may be integrated. At the same time when the piston assembly 206 reaches a position where the disengagement between the ball member 214 and the circumferential groove 202c is allowed, the engagement state between the ball member 214 and the circumferential groove 202c is released. Since the ball member 214 engages with the circumferential groove 202c having the inverted trapezoidal cross section, the piston assembly 206 can move without any trouble in a direction that allows the ball member 214 and the circumferential groove 202c to be disengaged. By integrating the piston assembly 206 and the ball member 214, the number of parts is reduced.

It is a circuit diagram of a water heater provided with an emergency shut-off valve according to an embodiment of the present invention. 1 is a structural diagram of an emergency shutoff valve according to an embodiment of the present invention. (A) is sectional drawing at the time of valve opening, (b) is sectional drawing at the time of valve closing.

Explanation of symbols

A Water heater 1 First pipe 3 High pressure reducing valve 4 Hot water storage tank 5 Relief valve 8 Second pipe 2c Check valve 6 Hot water mixing valve 20 Emergency shutoff valve 201 Casing 202 Valve body 202c Circumferential groove 204 First spring 205 Return lever 206 Piston assembly 210 Second spring 214 Ball member

Claims (7)

A casing in which a flow path is formed, a valve body that opens and closes the flow path, a first spring that biases the valve body in a valve closing direction, and a valve body that is engaged with the valve body to open the valve body A stopper to be held, and a pressure-sensitive member that contacts the stopper and urges the stopper to engage with the valve body, and is capable of moving in a direction allowing the disengagement between the stopper and the valve body by sensing the internal pressure of the flow path. And an emergency shut-off valve. A primary side flow path, a secondary side flow path, and a valve hole for communicating the primary side flow path with the secondary side flow path are formed in the casing, and the valve body opens and closes the valve hole from the primary side flow path side. The emergency shut-off valve according to claim 1, wherein The emergency shut-off valve according to claim 1 or 2, wherein the stopper is a ball member engageable with a groove having an inverted trapezoidal cross section formed in the valve body. The emergency shut-off valve according to claim 1 or 2, wherein the stopper and the pressure sensitive member are integral, and the stopper has a spherical portion that can be engaged with a groove having an inverted trapezoidal cross section formed in the valve body. . The pressure-sensitive member includes a piston assembly having two piston heads having different pressure receiving areas for sensing the internal pressure of the flow path, a piston rod connecting the two piston heads, and biases the piston assembly toward the stopper. The emergency shut-off valve according to any one of claims 1 to 4, further comprising a second spring. The alarm member which protrudes out of a casing is interlocked with the movement to the direction which permits disengagement of the stopper of a pressure-sensitive member and a valve body, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The emergency shut-off valve described. The emergency shutoff valve according to any one of claims 1 to 6, further comprising a return member that engages with the valve body and receives an external force to return the valve body in a closed state to a valve open state.

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