JPH1061813A - Gas valve opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate proper opening through simple structure by providing an engagement releasing mechanism to release engagement between a spindle and a block mechanism to open in a snapping manner a supply water automatic gas valve when a flowing water pressure is increased and attains a given water pressure. SOLUTION: At the internal stage of movement of a spindle 3 advanced through the increase of a flow water pressure, the spindle 3 and a snap device 6 are integrally intercoupled through a ball 2 to maintain a lock state. However, when the flow water pressure is increased and suppresses a rebound force and the spindle 3 and an inner cylinder body 7 are advanced, the ball 2 reaches the position of a lock stepped part 42 and holding of the outer surface side is released, and the ball is escaped from a lock recess groove 41 to release locking. In which case, the rebound force of an absorbing spring 10 exerted in the backward movement direction of the spindle 3 is rendered ineffective, a press force on the spindle 3 by a flowing water pressure suppresses. A water pressure automatic valve 4 is pressed by the press member 32 of the spindle 3 and is opened in a snapping manner. This constitution causes gas to flow to a burner and be ignited through discharge of an igniter to start combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas valve opening / closing apparatus used in a gas water heater, and more particularly to an automatic water supply gas valve for opening / closing a gas passage to a burner in response to flowing water pressure.

[0002]

2. Description of the Related Art In general, a gas water heater is provided with an automatic water supply gas valve for opening a gas passage only when water is supplied to prevent empty cooking. However, since the water supply automatic gas valve uses the flowing water pressure as an operating source, the opening and closing operation of the gas flow passage is caused by the level of the flowing water pressure, so that a quick opening and closing operation cannot always be expected. Further, depending on the use conditions, the flowing water pressure is not always sufficient, and the flowing water pressure for opening and closing the automatic water supply gas valve may increase and decrease, and the automatic supply water gas valve may open and close unstable. Under such a use condition, the valve is in an incompletely opened state, so that the gas amount becomes too small, and the gas is not ignited, and raw gas is released or the fire is extinguished. In addition, there is a possibility that explosive ignition may be caused to the discharged raw gas by a re-ignition operation. Thus, in the gas valve opening / closing device described in Japanese Utility Model Publication No. 55-34379, as shown in FIG.
0, a pressing ring 5 for transmitting a pressing force by flowing water pressure
3, a disc-shaped leaf spring 52 that performs a snap operation by this pressing force, and a pressing collar 51 that transmits the snap operation of the disc-shaped leaf spring 52 to the automatic water supply gas valve 50, and when a predetermined flowing water pressure is reached. There is known a gas valve opening / closing device that instantaneously opens and closes a fixed opening by transmitting a snap operation of a plate-shaped leaf spring 52 to an automatic water supply gas valve 50.
In this automatic water supply water gas valve, a necessary opening degree can be secured at the time of ignition when the valve is opened. Therefore, ignition can be performed with a sufficient amount of gas, ignition mistake does not occur, and discharge of raw gas can be prevented. In addition, even when the valve is closed, the valve can be closed instantaneously from a certain opening degree, so that there is no possibility that the flame disappears and raw gas is released.

[0003]

However, in such a gas valve opening / closing device, it is difficult to manufacture a plate-shaped leaf spring.
There was a problem that it became expensive. In order to ensure the function of the plate-shaped leaf spring, a load required to be inverted and bent (hereinafter, referred to as an “inverted load”),
This displacement (reversing stroke) must be defined within a certain range. In addition, due to the characteristics of the plate-shaped leaf spring, the reversing load with respect to the reversing stroke causes hysteresis between when the pressing force is applied and when the pressing force is released. if,
When the predetermined accuracy is not obtained, the opening degree of the automatic water supply gas valve may be insufficient, may be inverted after halfway opening, or may remain inverted even after returning to the stopped state. . Therefore, in order to ensure this accuracy, the shape, thickness, material, and heat treatment of the plate-shaped leaf spring are strictly controlled, and it is strictly determined whether the gas valve opening and closing device operates properly even after assembly. Had to check. As a result, the gas valve opening / closing device has been expensive. When it is desired to set a large amount of gas at the time of ignition and fire extinguishing in accordance with a device having a different gas consumption and a calorific value of a gas to be used, the outer shape of the plate-shaped leaf spring is increased to increase the reverse stroke. Unless the degree of opening of the automatic water supply gas valve is increased or the seat diameter of the automatic water supply gas valve itself is designed to be large, it is impossible to secure a sufficient amount of gas, so that the equipment cannot be made compact.
An object of the present invention is to provide an inexpensive and highly reliable gas valve opening / closing device which solves the above-mentioned problems, enables a proper opening degree to be easily obtained with a simple structure, and provides an inexpensive and highly reliable device.

[0004]

A gas valve opening / closing apparatus according to the present invention for solving the above-mentioned problems is provided with a spindle which moves forward and backward in response to flowing water pressure, and a water supply automatic gas valve which opens and closes a gas passage in conjunction with the spindle. In the gas valve opening and closing device provided with, with the rise of flowing water pressure, engages with the spindle and moves forward integrally, and when the spindle reaches the position just before the water supply automatic gas valve is opened, A stopping mechanism for preventing advancement of the spindle, and when the flowing water pressure rises and reaches a water pressure at which the water supply automatic gas valve can be opened to a degree of opening sufficient for ignition, the advancing power of the spindle and the spindle are used. The disengagement mechanism for releasing the automatic water supply gas valve in a snap manner by disengaging with the blocking mechanism, and the spindle retreating with a decrease in flowing water pressure are provided at a predetermined opening position of the automatic water supply gas valve. Reached To engage the said spindle and said blocking mechanism is again urges in a direction to retract the spindle and gist in that a reset mechanism to snap to closed the water supply automatic gas valve.

According to the gas valve opening / closing device of the present invention having the above-described structure, when the spindle advancing as the flowing water pressure rises reaches a position immediately before the water supply automatic gas valve opens, the blocking mechanism prevents the spindle from advancing. I do. Then, when the flowing water pressure further rises and reaches a predetermined water pressure, the disengagement mechanism releases the engagement between the spindle and the blocking mechanism using the advance power of the spindle. At this time, the running water pressure has reached the water pressure that allows the automatic feed water gas valve to open to a sufficient degree for ignition, and when the engagement between the spindle and the blocking mechanism is released, the spindle moves forward in a snap- The automatic feed water gas valve is opened. Therefore, ignition can be performed with a sufficient amount of gas, so that no ignition error occurs and no raw gas is emitted. Further, when the spindle which retreats with the drop of the flowing water pressure reaches the predetermined opening position of the automatic feed water gas valve (the opening which is equal to or more than the minimum which can continue the combustion), the reset mechanism again connects the spindle and the blocking mechanism. The water supply automatic gas valve is snap-closed by engaging the spindle in the backward direction. Therefore, in the process of closing the valve, the flame does not disappear and the raw gas is not released. The required degree of opening of the water supply automatic gas valve can be freely set by changing the position and spring force of the blocking mechanism that urges the spindle in the backward direction. Therefore, it is possible to easily set an appropriate opening degree according to a device having a different gas consumption and a calorific value of a gas to be used.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of the gas valve opening / closing device of the present invention will be described below. FIG. 1 is a schematic diagram of a gas water heater as one embodiment. In the water supply path from the water inlet, a faucet 19 that opens and closes the flow path by manual operation using a push button 17 is provided, and the hydraulic pressure responsive device 1 is provided downstream thereof. The hydraulic pressure responsive device 1 is provided with a diaphragm 15 which is movable back and forth.
And a primary chamber 13 and a secondary chamber 12 are formed. A water governor 16 is provided coaxially with the diaphragm 15 at the entrance to the primary chamber 13 of the hydraulic pressure responsive device 1 to keep the flow rate constant even when the supply water pressure fluctuates. Also, Primary Room 1
A hot water temperature control unit 18 is provided in the flow path continuing from 3. The hot water temperature controller 18 branches the flow path in two directions, passes through a venturi 22 to a heat exchanger 23, and then mixes the water with a mixing unit 21.
And a bypass path 20 directly leading to the mixing section 21. Then, the branched flow paths merge at the mixing section 21 to reach a tap.

The venturi 2 provided in the heating path 28
Numeral 2 narrows the flow path and is provided with a horizontal hole in a direction perpendicular to the flow path and communicates with the secondary chamber 12 of the hydraulic pressure responsive device 1. When the water is passed to the venturi 22, the pressure in the secondary chamber 12 decreases in accordance with the decrease in the water pressure in the lateral hole due to the venturi effect. Accordingly, a differential pressure is generated between the primary chamber 13 and the secondary chamber 12, and a displacement force (to the left in the drawing) is generated in the diaphragm 15 that can be moved back and forth. A push shaft 14 for transmitting displacement and the spindle 3 are provided on the diaphragm 15 so as to abut on the same axis, and the other end of the spindle 3 is provided with an automatic water supply gas valve 4. The automatic water supply gas valve 4 is urged by a valve spring 5 so as to close in the downstream direction of the gas flow path. When water is supplied, the displacement force of the diaphragm 15 overcomes the force of the valve spring 5 to open the gas flow path.

A push button 1 for performing an ignition operation and a fire extinguishing operation
7 is turned on during the ignition operation, and the next push operation (fire extinguishing operation)
An operation switch 30 that keeps the ON state is provided. Further, the push button 1 is provided in the gas supply path to the burner 27.
7, an instrument plug 25 for opening and closing the gas passage is provided. A push solenoid 31 that is energized to generate a pressing force when the operation switch 30 is turned on and the hydraulic switch 33 is turned on is provided downstream of the operation switch 30. Further, the valve faces the push solenoid 31 and is pushed to open the valve. During combustion, the valve is kept open by the thermoelectromotive force of a thermocouple (not shown). If a combustion abnormality occurs, the thermoelectromotive force is reduced. A magnetic safety valve 26 that closes the valve is provided. Also,
An electrode (not shown) that ignites the gas by discharge on the burner 27
Is provided.

Downstream of the automatic feed water gas valve 4, a snap device 6 for opening and closing the automatic feed water gas valve 4 in a snap manner is coaxially inserted into the spindle 3 that transmits the displacement of the hydraulic pressure response device 1. FIG. 3 shows a schematic view of the snap device 6. The snap device 6 includes an inner cylinder 7 and an outer cylinder 9 as main parts. The inner cylinder 7 is loosely inserted into the spindle 3 so that the spindle 3 can freely slide in the axial direction. on the other hand,
The outer cylinder pair 9 is provided so as to be slidable with respect to the inner cylinder 7, and is pushed in the forward direction of the spindle 3 by a pressing spring 31 mounted between a spring receiver 8 fixed to the spindle 3 and the outer cylinder 9. Be energized. Further, an absorbing spring 10 is mounted between the spring receiving step 35 of the outer cylinder 9 and a spring receiving plate 46 fixed to the retreating side of the inner cylinder 7, and the inner cylinder 7 and the outer cylinder 9 are fixed. Are urged in the direction in which they are separated from each other. Also, the inner cylinder 7 and the outer cylinder 9
The positioning means that the locking projection 43 formed on the inner cylindrical body 7 and the locking part 44 formed on the outer cylindrical body 9 come into contact with each other and are positioned so as to be most separated from each other. An inner peripheral surface portion 47 on which the inner cylindrical body 7 slides is provided on the retreating side of the outer cylinder pair 9, and a lock step portion having a larger diameter to form a step portion adjacent to the inner peripheral surface portion 47. 42 are provided.

On the downstream side of the automatic water supply gas valve 4, a storage chamber 3 for storing the snap device 6 coaxially with the spindle 3.
9 are provided. When the spindle 3 moves forward and reaches the position immediately before the water supply automatic gas valve 4 is opened, the storage chamber 39 is provided with a contact portion 38 that locks the outer cylinder 9 and regulates the advance.

The inner cylindrical body 7 is provided with ball receiving holes 40 at equal intervals at four locations (not shown), and four spherical balls 2 are inserted into the respective ball receiving holes 40. In addition, spindle 3
Is provided with a lock groove 41 in which a constricted portion slightly larger than the spherical radius of the ball 2 is formed. Then, receiving the urging force in the separating direction of the inner cylinder 7 and the outer cylinder 9 due to the elastic force of the pressing spring 31 and the absorbing spring 10, the locking projection 43 of the inner cylinder 7 is moved to the outer cylinder 9. The lock concave groove 41 of the spindle 3 and the outer cylinder 9
The inner peripheral surface portion 47 having the minimum inner diameter and the ball receiving hole 40 of the inner cylindrical body 7 maintain a positional relationship where they match. Further, the ball 2 falls into the lock groove 41 of the spindle 3, and the outer surface side of the ball 2 enters the inside of the inner peripheral surface portion 47 of the outer cylinder 9, and the inner cylinder 7
Is configured to be locked integrally with the spindle 3 via the ball 2. When the spindle 3 moves forward, the contact portion 38 is locked in the storage chamber 39, the movement of the outer cylinder 9 is restricted, and the absorbing spring 10 is compressed, so that the outer cylinder that contacts the outer surface side of the ball 2. 9 are provided in such a manner that the inner peripheral surface portions 47 are shifted. In this case, the ball 2 moves radially from the axis of the spindle 3, escapes from the lock groove 41 provided in the spindle 3 and moves to the lock step 42 side, and the outer shape of the ball 2 is Ball 2 by being held
So that the lock between the spindle 3 and the inner cylindrical body 7 is released.

The spindle 3 is located upstream of the snap device 6.
A hydraulic automatic valve 4 is slidably inserted through the valve and is urged by a valve spring 5 so as to close in the downstream direction, comes into contact with and separates from a seat portion 34 provided in a flow path, and opens and closes a gas flow path. The spindle 3 is provided with a push member 32 for opening the automatic hydraulic valve 4.

Next, the operation of the water supply automatic gas valve 4 will be described with reference to FIGS. FIG. 3 shows a closed state of the automatic feed water gas valve 4. When the flowing water pressure rises from this stopped state, the hydraulic pressure responsive device 1 operates, and the spindle 3 moves forward (to the left in the figure). Then, in the initial stage of the movement of the spindle 3, the spindle 3 and the snap device 6 are integrally connected by the ball 2 and maintain the locked state (FIG. 2A). That is, the engagement projection 43 of the inner cylinder 7 is engaged with the outer cylinder 9 by the urging force of the inner cylinder 7 and the outer cylinder 9 in the separating direction due to the resultant force of the load of the pressing spring 31 and the absorption spring 10. The maximum separation distance is maintained in a state of contact with the stop portion 44. Further, the ball 2 of the lock device is fitted into the lock groove 41 of the spindle 3, and its outer surface is held by the inner peripheral surface portion 47 of the outer cylindrical body 9 without rattling. Spindle 3
And the inner cylinder 7 are integrally coupled by the locking action of the ball 2, and the outer cylinder 9 is connected to the inner cylinder 7 via an absorption spring 10.
Since these locked states are maintained while maintaining the separated state, the spindle 3 and the outer cylinder body 9 move forward together. When the outer cylinder 9 advances by a stroke corresponding to a gap between the contact surface of the outer cylinder 9 and the storage chamber 39, the outer cylinder 9 contacts the contact portion 38 of the storage chamber 39 and is prevented from moving forward. And only the inner cylinder 7 are connected by the ball 2 of the lock device and continue to move forward. At this time, the pushing force due to the flowing water pressure is absorbed by the elastic force of the absorbing spring 10 provided between the outer cylinder 9 and the inner cylinder 7.

Further, when the running water pressure rises to overcome the elastic force and the absorbing spring 10 contracts and the spindle 3 and the inner cylinder 7 move forward, the ball 2 of the locking device locks the outer cylinder 9. The position of the step portion 42 is reached, and the inner peripheral surface portion 47 of the outer cylindrical body 9 is reached.
As a result, the ball 2 is pushed out of the lock groove 41 and escapes, and the outer cylindrical body 9 is released.
And the lock by the ball 2 is released (FIG. 2B). Then, spindle 3 until now
The resilience of the absorbing spring 10 working in the retreating direction disappears at once, and the pushing force on the spindle 3 by the flowing water pressure becomes superior.
To open the valve in a snap manner (FIG. 4). When the automatic hydraulic valve 4 is opened, the gas flows to the burner 27,
The gas is ignited by the discharge of an igniter (not shown) and combustion starts. On the other hand, the snap device 6 can be moved separately from the spindle 3 and the snap device 6 by releasing the lock. Therefore, the elastic force of the pressing spring 31 provided between the outer cylinder 9 and the spindle 3 causes the storage chamber 39 to move. (See FIG. 5).

Next, when the tapping is stopped from this state, the water flowing through the water supply channel toward the heat exchanger 23 stops, and the pushing force of the diaphragm 15 to the left by the flowing water pressure is released. Is retracted rightward in the figure by the elastic force of the valve spring 5 and the return spring 11. Then, during the retreat of the spindle 3, the lock concave portion 41 of the spindle 3 reaches the position of the ball 2 of the lock device (FIG. 6), and the ball 2 fits into the lock concave groove 41. In the process, the force of the absorbing spring 10 provided between the inner cylinder 7 and the outer cylinder 9 moves the inner cylinder 7 rightward in the drawing, and the ball 2
At the same time, the spindle 3 is snapped in the retreating direction by a component force for retreating the spindle 3 via the inner cylinder 7 and the ball 2 (FIG. 2).
(C)). Therefore, the water supply automatic gas valve 4 has the predetermined opening H
The valve is immediately closed from 2 to stop combustion. At this time, the ball 2 is moved by the movement of the inner cylinder 7 to the right in FIG.
2 and gets into the lock groove 41, and its outer surface is held by the inner peripheral surface portion 47, so that the spindle 3 and the snap device 6 are locked by the ball 2 (FIG. 3) (FIG. 2 ( I)). Therefore, the snap device 6
Can be prepared in case of returning to the initial stop state and opening the automatic water supply water gas valve 4 again.

Next, a load characteristic with respect to the stroke of the spindle 3 is shown in FIG. 7, and the opening / closing operation of the automatic water supply gas valve 4 will be described. In the following description, the term “water pressure” is simply the pushing force of the spindle 3 obtained by subtracting the force of the return spring 11 acting in the opposite direction from the pushing force of the hydraulic pressure responsive device 1.

In the stop state without running water pressure, the spindle 3
Is in the retracted position (FIG. 3). Then, when the flowing water pressure rises from the stopped state, the snap device 6 is locked with the spindle 3 (FIG. 2A) and moves forward integrally. The point o → point a in FIG.
The spindle 3 moves smoothly without hindering the advance. Further, when the flowing water pressure rises, the outer cylinder portion 9 comes into contact with the contact portion 38 of the storage chamber 39, and the movement of the outer cylinder portion 9 is prevented. On the other hand, since the spindle 3 and the inner cylinder 7 are locked and move forward, the absorption spring 10 between the outer cylinder 9 and the inner cylinder 7, the spindle 3 and the outer cylinder 9
The pressing spring 31 between them is compressed.

The point m → t in FIG. 7 indicates the resilience of the absorbing spring 10 applied to the spindle 3 via the ball 2 and k
Point → r point indicates the force of the pressing spring 31 applied to the spindle 3. Therefore, the resultant force for preventing the spindle 3 from moving forward increases from point a → point c → point d. Then, when reaching the point d, the ball 2 starts to be disengaged from the lock groove 41 of the spindle 3, and at the subsequent point e, the spindle 3 starts to open the automatic water supply gas valve 4. Here, from the point t to the point q, the contact angle between the center of the ball 2 and the spindle 3 changes as the ball 2 comes out of the lock recess of the spindle 3, and the force that hinders the advance of the spindle 3 decreases. At the point q, the lock between the spindle 3 and the snap device 6 is completely released. Then, at the point n, the pushing member 32 provided on the spindle 3 starts opening the automatic hydraulic valve 4 by the advance of the spindle 3. Note that points n → p → s show the load characteristics of the valve spring 5 applied to the spindle 3 during the stroke of the spindle 3. Therefore, the resultant force for preventing the spindle 3 from moving forward changes from point d → point e → point f → point g. However, the combined force of the spring load is reduced from the point d, and the pushing force by the flowing water pressure is more than that, so that the spindle 3 is moved at a stroke to the point h, which is a load equivalent to the point d. FIG. 2 (b). Therefore, the feed water automatic gas valve 4 opens instantaneously at the opening degree of H1 at which no ignition occurs (FIG. 4). When the water supply automatic gas valve 4 is opened, the gas flows into the burner 27 and is ignited by the discharge of an igniter (not shown) to start combustion. Further, the valve spring 5 is compressed according to the rise of the flowing water pressure, the opening degree of the automatic water supply gas valve 4 is widened, the load of the valve spring 5 reaches the point j (point h → point j), and the combustion is continued (FIG. 5).

On the other hand, when the water stops, the hydraulic pressure responsive device 1 loses the pressure difference between the primary chamber 13 and the secondary chamber 12 of the diaphragm 15, and starts to retreat the spindle 3 to the stop position (rightward in the figure). Then, when the flowing water pressure decreases and the combined force on the spindle 3 reaches the point j → g, and the ball 2 starts to fit into the lock groove 41 of the spindle 3, the force of the absorbing spring 10 causes the spindle 3 to retreat. (FIG. 6) (FIG. 2 (C)), and the spindle 3 is immediately moved to the point b which is the same load as the point g. Therefore, the water supply automatic gas valve closes instantaneously from the opening degree of H2. At time t during the retraction of the spindle 3, the snap device 6 and the spindle 3 are re-engaged. Therefore, the feed water automatic gas valve 4 is
Extinguish the fire immediately without releasing raw gas. Moreover,
When the flowing water pressure decreases, the spindle 3 moves backward (point b → a
(Point → o point) and return to the stop position (FIG. 3).

As described above, the automatic water supply gas valve 4 of this embodiment opens or closes instantly when the flow pressure reaches a predetermined flow pressure as the flow pressure rises or falls. Therefore, when the water supply automatic gas valve 4 is opened, the valve is not opened at a halfway opening, the required opening is secured, and ignition can be performed with a sufficient amount of gas. And release of raw gas can be eliminated. In addition, when the water supply automatic gas valve 4 is closed, the valve is not closed at a halfway opening, but can be closed instantaneously from a sufficient opening, so that the flame disappears due to an insufficient gas amount. It does not happen
Emission of raw gas during the valve closing process can be eliminated. Further, since no raw gas is emitted, there is no explosive ignition caused by the re-ignition operation.

The required opening can be freely set by changing the position of the blocking mechanism for urging the spindle in the backward direction and the spring force thereof. Therefore, as described in the conventional example, the result of changing the plate-like leaf spring, changing the stroke of the spindle, or increasing the seat diameter of the automatic water supply gas valve for the purpose of changing the opening of the automatic water supply gas valve at the time of ignition. However, there are no major changes and no reduction in size is sacrificed. Therefore, it is possible to easily set an appropriate opening degree according to a device having a different gas consumption and a calorific value of a gas to be used. Further, it is possible to easily provide a water supply automatic gas valve having not only a function of preventing raw gas emission at the time of opening and closing but also a function of slow ignition for smoothly igniting.

As described above, the gas valve opening / closing apparatus shown in this embodiment does not use an expensive plate-shaped leaf spring that performs a snap operation, but can easily provide an appropriate degree of opening by using a cheap coil spring. Inexpensive and high security can be secured.

The embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the gist of the present invention. Of course. For example, in the embodiment, the blocking mechanism, the disengagement mechanism, and the reset mechanism are described as being incorporated in the spindle in the gas flow path, but may be incorporated in the spindle outside the gas flow path communicating from inside the flow path.

[0024]

As described above in detail, according to the gas valve opening / closing device of the present invention, the automatic water supply water gas valve is instantaneously opened to a predetermined opening and immediately closed from the predetermined opening. Can be.
Further, a gas valve opening / closing device can be manufactured at low cost by using a spring force without using an expensive plate-shaped leaf spring. Further, it is possible to easily set an appropriate opening degree according to a device having different gas consumption and a calorific value of a gas to be used, thereby improving safety.

[Brief description of the drawings]

FIG. 1 is a schematic view of a gas valve opening / closing device according to an embodiment of the present invention.

FIG. 2 is a schematic view of a lock unit according to the embodiment of the present invention.

FIG. 3 is a schematic view of a snap device according to an embodiment of the present invention (valve closed state).

FIG. 4 is a schematic view of a snap device according to an embodiment of the present invention (in a valve open state).

FIG. 5 is a schematic view of a snap device according to an embodiment of the present invention (in a fully opened state).

FIG. 6 is a schematic view of the snap device according to the embodiment of the present invention (before closing the valve).

FIG. 7 is a graph showing a relationship between a spring load and a stroke according to the embodiment of the present invention.

FIG. 8 is a schematic view of a conventional gas valve opening / closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Water pressure response device 2 ... Ball 3 ... Spindle 4 ... Automatic water supply gas valve 5 ... Valve spring 6 ... Snap device 7 ... Inner cylinder 8 ... Spring receiver 9 ... Outer cylinder

Claims (1)

[Claims] 1. A gas valve opening / closing device comprising: a spindle which moves forward and backward in response to flowing water pressure; and a water supply automatic gas valve which opens and closes a gas passage in conjunction with the spindle. A stopper mechanism for stopping the advance of the spindle when the spindle reaches a position immediately before the water supply automatic gas valve is opened by engaging the spindle and integrally moving forward; and When the water pressure that can open the automatic gas valve to an opening degree sufficient for ignition is reached, the advancement of the spindle is used to disengage the spindle from the blocking mechanism and the water supply automatic gas valve is snapped. When the spindle, which retreats as the flowing water pressure drops, reaches a predetermined opening position of the water supply automatic gas valve, the spindle and the blocking mechanism are engaged again. ,spin Urges in a direction to retract the Le gas valve control, characterized in that a reset mechanism to snap to closed the water supply automatic gas valve.