JP3786246B2 - On-off valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-off valve for supplying and stopping water supply.
[0002]
[Prior art]
In a general flush toilet, water supplied from a water supply pipe such as a water pipe is temporarily stored in a toilet cleaning tank such as a low tank, and the toilet bowl is washed with the water stored in the toilet cleaning tank. However, such a general flush toilet requires a space for installing a toilet cleaning tank. Therefore, in recent years, from the viewpoint of effective use of space, etc., an on-off valve (flow adjustment valve) is provided between the water supply pipe and the flush toilet, and the water supplied from the water supply pipe by the opening of the on-off valve is flushed. A tankless toilet that can be directly supplied to a toilet is being developed (Japanese Patent Laid-Open No. 3-90723).
[0003]
Such conventional off valve in tankless toilet can be employed includes an adjustable valve mechanism the opening between the inlet port and the outlet port and having an input water port及beauty out water port in the housing. The water inlet port is connected to a water supply pipe so that water can be taken into the housing, and the water outlet port is connected to a tankless toilet so that water can be discharged from the housing to the tankless toilet. Further, as a valve mechanism, a diaphragm is provided between the water inlet port and the water outlet port, and this diaphragm can be bent by operating the electromagnetic valve.
[0004]
In this on-off valve, the diaphragm is bent by the operation of the electromagnetic valve, whereby the opening degree of communication between the water inlet port and the water outlet port can be adjusted.
[0005]
[Problems to be solved by the invention]
However, the conventional on-off valve employs a flexible diaphragm as the valve mechanism, and the diaphragm is bent and the operation responsiveness is not stable. For example, the washability when used in a flush toilet, etc. Reliability will be a concern.
In particular, in this on-off valve, one surface of the diaphragm constantly receives the pressure of water in the water inlet port. For this reason, in this on-off valve, when the water pressure in the water inlet port is excessively high, the opening degree of communication between the water inlet port and the water outlet port tends to increase contrary to the operation of the electromagnetic valve for reducing the opening degree. On the other hand, when the water pressure in the water inlet port is excessively low, the opening degree of communication between the water inlet port and the water outlet port tends to be small, contrary to the operation of the solenoid valve that increases the opening degree. These fluctuations in the water pressure in the water inlet port are caused by the environment in which the on-off valve is used, such as a higher floor of the building or an advanced underground. For this reason, it is considered that the on-off valve is particularly difficult to stabilize the operation response.
[0006]
This invention is made | formed in view of the above-mentioned actual condition, and makes it the subject which should be solved to provide the on-off valve which can contribute to stabilization of an operation response property.
[0007]
[Means for Solving the Problems]
The on-off valve of the present invention has an inlet port for taking in water having pressure and an outlet port for discharging the water in the housing, and an on-off valve having a valve mechanism capable of adjusting the opening between the inlet port and the outlet port. In
The valve mechanism is provided so as to be slidable in the axial direction within the housing by an external operation of an external operation means, and is seated on the seating surface of the housing by sliding to one side in the axial direction. A piston that closes the communication between the water intake port and the water discharge port and slides away from the seating surface by sliding to the other side in the axial direction to open the communication between the water intake port and the water discharge port; Pressure canceling means for canceling the pressure received on the other side from the water in the port or the water discharge port,
The water inlet port opens to the peripheral surface side of the piston, the water outlet port opens to one end surface side in the axial direction of the piston, and the boundary area between the outer peripheral portion of the piston and the inner wall surface of the housing is sealed And
The pressure canceling means includes a pressure canceling chamber formed on the other side of the piston, an axially extending through the piston, and the water outlet port and the pressure canceling chamber in a state where the piston is seated on the seat surface. the features and Turkey, such a communication passage for communicating.
[0008]
In the on-off valve of the present invention, when the piston slides to one side in the axial direction by the external operation of the external operation means, the piston is seated on the seat surface of the housing, and the communication between the water inlet port and the water outlet port is closed. In this state, the flow of water from the water entry port is stopped. Further, when the piston slides to the other side in the axial direction by the external operation of the external operation means, the piston is separated from the seat surface of the housing, and communication between the water inlet port and the water outlet port is opened. In this state, in accordance with the opening degree, the water flows through the housing from the inlet port, is discharged from the outlet port. Thus, in this on-off valve, the opening degree of communication between the water inlet port and the water outlet port can be adjusted by external operation of the external operation means.
[0009]
In this way, since the communication between the water inlet port and the water outlet port is opened and closed by the piston, the piston receives pressure on the other side by the water in the water inlet port or the water outlet port. At this time, the non-flexible piston does not bend toward the valve opening side due to the pressure on the other side. However, if only a space for sliding the piston is provided, the axial slidability of the piston is hindered by the pressure on the other side. For this reason, in the on-off valve of the present invention, the pressure canceling means cancels out the pressure toward the other side, thereby ensuring the slidability in the axial direction of the piston. For this reason, in this on-off valve, the operation responsiveness is stable, and for example, the reliability of the washability when used in a flush toilet can be improved.
[0010]
Further, in the on-off valve of the present invention, since the valve closing / opening speed can be arbitrarily set by the operation of the piston, it is possible to eliminate a sudden valve closing / opening due to the diaphragm of the conventional on-off valve. . For this reason, in this on-off valve, even if water is flowed at a large flow rate, a sudden valve closing can be prevented, so that the occurrence of water hammer can be prevented and noise can be suppressed.
[0011]
Furthermore, since the conventional on-off valve uses a diaphragm, it is difficult to sufficiently open the valve at a low pressure of water , and pressure loss is likely to occur. In this regard, in the conventional on-off valve, if the valve is sufficiently opened even at a low pressure of water , thereby reducing the pressure loss, the on-off valve must be enlarged in size. In other words, the size is increased and the mountability on a flush toilet or the like is impaired. On the other hand, in the on-off valve of the present invention, even a small piston can be sufficiently opened at the time of low pressure of water by its operation, so that it is difficult to cause pressure loss and does not necessarily increase in size. And so on.
[0012]
The pressure canceling means includes a pressure canceling chamber formed on the other side of the piston, and a communication passage that extends through the piston in the axial direction and communicates the outlet port and the pressure canceling chamber in a state where the piston is seated on the seat surface. Consists of. If this, water present on one side of the piston from the exit water port is moved to the pressure counteracting chamber through the communication passage, the balance of the water pressure in the pressure offset chamber, the pressure on one side of the water of the piston Is achieved, and the differential pressure between the two is eliminated or reduced.
[0013]
Communication passage, formed piston. When the communication path is formed in the housing, the piston slides in the axial direction, so the communication path becomes complicated, such as bending the communication path. However, if it is formed in the piston, the communication path is provided in the axial direction. For example, a simple communication path can be employed. Further, if the communicating path is formed through the piston in the axial direction, the water moving in the communicating path does not receive resistance when the piston slides, and the slidability of the piston is improved.
[0014]
Inlet port of the housing is opened to the circumferential surface of the piston, you are open to the end face of one side in the axial direction the water outlet port of the piston housing. In this case, the piston does not receive pressure on the other side due to the water in the water inlet port, and even if the pressure of the water in the water inlet port is excessively high or low depending on the environment in which the on-off valve is used, Thereby, the slidability of the piston does not change.
[0015]
As the external operation means, it is possible to adopt a configuration that allows the piston to be externally operated by magnetic force or the like, but a shaft that is fixed to the piston and protrudes from the housing and slides in the axial direction while facing the biasing means is adopted. It is preferable to do. If this is the case, it is not necessary to employ a solenoid valve like a conventional on-off valve, so that the manufacturing cost of the on-off valve can be reduced. In particular, when using multiple open / close valves, the conventional open / close valve must be opened and closed by individual solenoid valves. However, if such a shaft is used, the individual shafts can be opened and closed by individual cams. The effect of cost reduction is great.
[0016]
In the on-off valve of the present invention, the relationship between the urging means and the shaft shown in FIGS. 9A to 9D can be employed. Here, as the urging means, in addition to a pressing means such as a pressing spring for pressing the piston, a pulling means such as a tension spring for pulling the piston can be employed.
In the relationship shown in FIG. 9A, the urging means S urges the piston P to one side in the axial direction, and the shaft D protrudes to the one side. In this relationship, when the shaft D is pushed to the other side against the urging force of the urging means S, the piston P opens the communication between the water inlet port I and the water outlet port O. On the other hand, when the shaft D is pulled to one side in response to the urging force of the urging means S, the piston P closes the communication between the water inlet port I and the water outlet port O.
[0017]
Further, in the relationship shown in FIG. 9B, the urging means S urges the piston P to one side, and the shaft D projects to the other side. In this relationship, when the shaft D is pulled to the other side against the urging force of the urging means S, the piston P opens the communication between the water inlet port I and the water outlet port O. On the other hand, if the shaft D is pushed to one side by bending to the urging force of the urging means S, the piston P closes the communication between the water inlet port I and the water outlet port O.
[0018]
Further, in the relationship shown in FIG. 9C, the urging means S urges the piston P to the other side, and the shaft D protrudes to the one side. In this relationship, when the shaft D is pulled to one side against the biasing force of the biasing means S, the piston P closes the communication between the water inlet port I and the water outlet port O. On the other hand, if the shaft D is pushed to the other side in response to the urging force of the urging means S, the piston P opens the communication between the water inlet port I and the water outlet port O.
[0019]
Further, in the relationship shown in FIG. 9D, the urging means S urges the piston P to the other side, and the shaft D protrudes to the other side. In this relationship, when the shaft D is pushed to one side against the urging force of the urging means S, the piston P closes the communication between the water inlet port I and the water outlet port O. On the other hand, when the shaft D is pulled to the other side by bending to the urging force of the urging means S, the piston P opens the communication between the water inlet port I and the water outlet port O.
[0020]
Of these, the relationship shown in FIG. If this employs a common pressure spring as the urging means S, while the piston P can be closed the communication between the inlet port I and outlet port O by the urging force of the pressing spring, and inlet port I In order to open the communication with the water outlet port O, a cam for pushing the shaft D to the other side against the biasing force of the biasing means S can be employed. Since such a cam has a structure in which the shaft D is pushed to the other side in order to open the communication between the water inlet port I and the water outlet port O, the structure becomes relatively simple, and the manufacturing cost of the on-off valve can be reduced. .
[0021]
According to the preferable form of the on-off valve of this invention, the structure which a drainage port is connected to the flush toilet (tankless toilet) which does not have a toilet bowl washing tank is employable. If it is like this, the water supply and the water supply stop with respect to the tankless toilet which does not have a toilet bowl washing tank can be reliably performed with an on-off valve also in the high floor of a building or an advanced underground.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
Off valve 1 embodiment, as shown in FIGS. 1 and 2, has a write No incoming water port 21 takes the water into the housing 2, and to output water port 23 exits spit water.
[0023]
The housing 2 is formed with a piston chamber 25 communicating with the water inlet port 21 and the water outlet port 23. The piston 3 is accommodated in the piston chamber 25 so as to be slidable in the axial direction. The water inlet port 21 is opened to the circumferential surface side of the piston 3, and the water outlet port 23 is bent from the one end surface side in the axial direction of the piston 3 to the side surface side of the housing 2. An O-ring 31 is held in the ring groove at the outer peripheral portion of the piston 3, and seals the boundary area between the outer peripheral portion of the piston 3 and the inner wall surface of the housing 2.
[0024]
A pressure canceling chamber 4 is formed in the piston chamber 25 by the housing 2 and the other end surface 3 b of the piston 3. The pressure canceling chamber 4 communicates with the outlet port 23 side through a plurality of communication holes 4 a formed in the piston 3. Each communication hole 4a connects the one end surface 3a side and the other end surface 3b side of the piston 3 in the axial direction. The pressure canceling chamber 4 and the communication holes 4a are pressure canceling means.
[0025]
In the pressure canceling chamber 4, a pressing coil spring 5 as an urging means is coaxially arranged. The pressing coil spring 5 is interposed between the housing 2 and the other end surface 3b of the piston 3, and normally biases the piston 3 in one direction, that is, in the direction of the arrow Y1, and closes the communication between the water inlet port 21 and the water outlet port 23. Has a biasing force.
A shaft 6 as an external operation means that can move the piston 3 in the axial direction is coaxially fixed to one end surface 3 a of the piston 3 and protrudes from the housing 2. The distal end portion of the shaft 6 protrudes from the housing 2 in one axial direction, that is, in the direction of the arrow Y1, and the other side in the axial direction, that is, in the direction of the arrow Y2a by the cam 70 (the first cam 91 or the second cam 92 in FIG. 3). Can be pressed. When the shaft 6 is pressed in the direction of the arrow Y2a by the cam 70, the piston 3 is slid in the same direction in conjunction with it. The boundary area between the shaft 6 and the housing 2 is sealed by an O-ring 62.
[0026]
As shown in FIGS. 3 and 4, one is a rim opening / closing valve 1B and the other is a jet opening / closing valve 1C. The water supply device 7 is assembled. The water supply device 7 includes the on-off valves 1B and 1C, connecting members 14B and 14C, a pair of vacuum breakers 15B and 15C, a cam device 90, a driving device 94, a handle 95 for manual operation, and a not-shown illustration. It consists of a controller. As shown in FIGS. 5 to 8, the water supply device 7 is incorporated through the base plate 9 at the rear end of the tankless toilet 8 that does not have a toilet cleaning tank as a sanitary device, and is hidden by a cover 81. The toilet bowl portion 80 of the tankless toilet 8 communicates with the bowl portion 82 for receiving excrement, the rim 84 having the rim water passage 83 circulated around the upper periphery of the bowl portion 82, and the bottom of the bowl portion 82 for excretion. A trap portion 85 for flowing an object and a jet nozzle 87 attached to the inlet of the trap portion 85 are provided. The toilet seat and the toilet lid are not shown.
[0027]
As shown in FIGS. 3 and 4, the water inlet port 21 </ b> C of the on-off valve 1 </ b> C protrudes from the side surface and is formed with a flange 7 a, and the flange 7 a has a conduit 101 as shown in FIGS. 5 to 8. One end is connected. The other end of the conduit 101 is connected to a branching device 102, and the branching device 102 is connected to a water supply pipe such as a water pipe through a water stop cock (not shown) by a flexible hose 103. Further, the water inlet port 21C of the on-off valve 1C shown in FIGS. 3 and 4 is a communication path 22 formed between the housing 2 and the outer peripheral surface 3f of the piston 3 as in the on-off valve 1 shown in FIGS. Is connected to the water inlet port of the on-off valve 1B.
[0028]
As shown in FIGS. 3 and 4, a connecting member 14C is connected to the on-off valve 1C, and a vacuum breaker 15C is connected to the upper end of the connecting member 14C. The water outlet port 23C of the on-off valve 1C is connected to the water outlet port 24C of the connecting member 14C and the air hole of the vacuum breaker 15C. The outlet port 24C of the connecting member 14C protrudes downward to form a flange 7b. The flange 7b is connected to the jet nozzle 87 of the tankless toilet 8 by a jet conduit 97 as shown in FIGS. ing.
[0029]
On the other hand, as shown in FIGS. 3 and 4, a connecting member 14B is also connected to the on-off valve 1B, and a vacuum breaker 15B is connected to the upper end of the connecting member 14B. As with the on-off valve 1B, the water outlet port of the on-off valve 1B is connected to the water outlet port 24B of the connecting member 14B and the air hole of the vacuum breaker 15B. The water discharge port 24B of the connecting member 14B protrudes downward to form a flange 7c. The flange 7c communicates with the rim water passage 83 of the tankless toilet 8 by a rim conduit 98 as shown in FIGS. Has been. As shown in FIGS. 6 and 8, the rim conduit 98 has an opening 98a that opens to the front end side and can discharge water clockwise, and an opening 98b that opens to the side surface and can discharge water counterclockwise. Is formed.
[0030]
A cam device 90 shown in FIGS. 3 and 4 is fixed to both the on-off valves 1B and 1C, and has a bracket 90b whose both ends protrude toward the front, and a camshaft rotatably held by the bracket 90b in a horizontal state. 90a, and shafts 6B and 6C of the on-off valves 1B and 1C fixed to the camshaft 90a and first and second cams 91 and 92 that can come into contact with the outer cam surface.
[0031]
The drive device 94 has a built-in transmission gear and a motor, and can rotate the camshaft 90a of the cam device 90 under the control of the controller.
The handle 95 is attached to the drive device 94 so that the cam shaft 90a of the cam device 90 can be manually rotated.
In the tankless toilet 8 configured as described above, water is supplied to the water supply device 7 through the water supply pipe, the stop cock, the flexible hose 103, the branch device 102, and the conduit 101. In the water supply apparatus 7, both the on-off valves 1 </ b> B and 1 </ b> C are closed unless a switch operation of a user who wants to wash the toilet bowl 80 is performed. That is, in the case of the on-off valve 1 shown in FIGS. 1 and 2, the piston 3 is moved in one axial direction, that is, in the direction of the arrow Y <b> 1 by the urging force of the pressing coil spring 5. Therefore, as shown in FIG. 1, the piston 3 is seated on the seat surface 2 a of the housing 2, the outer peripheral surface 3 f of the piston 3 closes the water inlet port 21, and the one end surface 3 a of the piston 3 closes the water outlet port 23. is doing. For this reason, the communication between the water inlet port 21 and the water outlet port 23 is closed, and water is not supplied to the tankless toilet 8.
[0032]
When the toilet bowl 80 is washed, the motor of the driving device 94 is driven by the signal from the controller based on the user's switch operation, and the camshaft 90a is rotationally driven. Thereby, the cam surface of the first cam 91 presses the shaft 6B of the on-off valve 1B downward, and opens the on-off valve 1B. That is, in the case of the on-off valve 1 shown in FIG. 1 and FIG. Then, the pressing coil spring 5 is elastically contracted, and the piston 3 moves in the other axial direction, that is, in the arrow Y2 direction. Thereby, as shown in FIG. 2, the piston 3 is separated from the seating surface 2 a of the housing 2, and communication between the water inlet port 21 and the water outlet port 23 is opened. Accordingly, the water supply device 7 supplies water to the rim water passage 83 through the rim conduit 98 and cleans the inner wall surface of the bowl portion 82.
[0033]
After the cam surface of the first cam 91 no longer presses the shaft 6B of the on-off valve 1B downward and the on-off valve 1B closes in the same manner as the on-off valve 1 closes, the cam surface of the second cam 92 opens and closes. The shaft 6C of the valve 1C is pressed downward, and the on-off valve 1C is opened in the same manner as the on-off valve 1. As a result, the water supply device 7 supplies water to the jet nozzle 87 via the jet conduit 97 and forcibly causes the siphon action in the trap portion 85.
[0034]
Next, the cam surface of the first cam 91 stops after the cam surface of the second cam 92 does not press the shaft 6C of the on-off valve 1C downward, and the on-off valve 1C closes in the same manner as the on-off valve 1 closes. Presses the shaft 6B of the on-off valve 1B downward again, and opens the on-off valve 1B again in the same manner as the on-off valve 1 described above. Thereby, the water supply device 7 supplies water to the rim water passage 83 via the rim conduit 98 and seals the bowl portion 82.
[0035]
Thus, in the on-off valves 1B and 1C of the embodiment, the opening degree of communication between the water inlet port and the water outlet port can be adjusted by the external operation of the shafts 6B and 6C. In the following, the on-off valve 1 shown in FIGS. 1 and 2 will be described. Since the piston 3 opens and closes the communication between the water inlet port 21 and the water outlet port 23, the piston 3 is moved to the other side by the water in the water outlet port 23. You will be under pressure. At this time, the non-flexible piston 3 is not bent toward the valve opening side by the pressure on the other side. However, if only a space for sliding the piston 3 is provided, the axial slidability of the piston 3 is hindered by the pressure on the other side. In this respect, in the on-off valve 1, the pressure canceling chamber 4 is formed on the other side of the piston 3, and the one side of the piston 3 and the pressure canceling chamber 4 are communicated with each other by a plurality of communication passages 4a. 3 moves to the pressure canceling chamber 4 via the communication passage 4a, and the water pressure in the pressure canceling chamber 4 and the water pressure on one side of the piston 3 are balanced. The differential pressure between the two is eliminated or reduced. Thereby, the axial slidability of the piston 3 is ensured. For this reason, in this on-off valve 1, the operation responsiveness is stable, and the reliability of the washability and the like when used in the tankless toilet 8 can be improved.
[0036]
Moreover, in the on-off valve 1 of the embodiment, since the communication path 4a is formed in the piston 3, each communication path 4a can be easily penetrated in the axial direction. And since the communicating path 4a is penetrated by the piston 3 in the axial direction, the water which moves in the communicating path 4a does not receive resistance at the time of sliding of the piston 3, and the slidability of the piston 3 is improved. .
Furthermore, in the on-off valve 1 of the embodiment, the water inlet port 21 of the housing 2 opens to the peripheral surface side of the piston 3, and the water outlet port 23 of the housing 2 opens to one end surface side of the piston 3 in the axial direction. Therefore, the piston 3 does not receive pressure on the other side due to the water in the water inlet port 21, and the water pressure in the water inlet port 21 may be excessively high or low depending on the environment in which the on-off valve 1 is used. Thereby, the slidability of the piston 3 does not change.
[0037]
Further, as the external operation means, a shaft 6 that is fixed to the piston 3 and protrudes from the housing 2 and slides the piston 3 in the axial direction while facing the pressing coil spring 5 is adopted. There is no need to employ a solenoid valve, and the manufacturing cost of the on-off valve 1 can be reduced. In particular, since the tankless toilet 8 shown in the embodiment uses a pair of on-off valves 1B and 1C, this effect is great. In addition, these on-off valves 1B and 1C can be opened and closed by first and second cams 91 and 92 fixed to one camshaft 90a, and this effect is great.
[0038]
Furthermore, in the on-off valve 1 of the embodiment, the pressing coil spring 5 urges the piston 3 to one side in the axial direction, and the shaft 6 protrudes to the one side. Therefore, a relatively inexpensive pressing coil spring 5 is employed. The urging force of the pressing coil spring 5 allows the piston 3 to close the communication between the water inlet port 21 and the water outlet port 23, while opening the communication between the water inlet port 21 and the water outlet port 23, against the urging force of the pressing coil spring 5. Thus, a cam 70 for pushing the shaft 6 to the other side can be employed. Since the cam 70 has a structure in which the shaft 6 is pushed to the other side in order to open the communication between the water inlet port 21 and the water outlet port 23, the structure becomes relatively simple, and the manufacturing cost of the on-off valve 1 can be reduced. Can do.
[0039]
Further, in the on-off valve 1 of the embodiment, the valve closing / opening speed can be arbitrarily set by the operation of the piston 3 via the cam 70 and the shaft 6, so even if water is flowed at a large flow rate, it is abrupt. Since the valve closing can be prevented, the generation of water hammer can be prevented, and noise and the like can be suppressed.
Furthermore, in the on-off valve 1 of the embodiment, even a small piston 3 can be sufficiently opened at the time of low pressure of water by its operation, so that it is difficult to cause pressure loss and does not necessarily increase in size. Excellent mountability to 8 is demonstrated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an on-off valve in a closed state according to an embodiment.
FIG. 2 is a cross-sectional view of the open / close valve according to the embodiment.
FIG. 3 is a front view of a water supply apparatus using an on-off valve for a jet and an on-off valve for a rim according to an application form of the embodiment.
FIG. 4 is a side view of a water supply apparatus using an on-off valve for a jet and an on-off valve for a rim according to an application form of the embodiment.
FIG. 5 is a cross-sectional view of a main part of a tankless toilet according to an application form of the embodiment.
FIG. 6 is a plan view of a main part of a tankless toilet according to an application form of the embodiment.
FIG. 7 is a rear view of the main part of the tankless toilet according to the application mode of the embodiment.
FIG. 8 is a perspective view of a main part of a tankless toilet according to an application form of the embodiment.
FIG. 9 is a schematic diagram showing an applicable configuration of the on-off valve of the present invention.
[Explanation of symbols]
1, 1B, 1C, 10 ... open / close valve (1B ... open / close valve for rim, 1C ... open / close valve for jet)
DESCRIPTION OF SYMBOLS 2 ... Housing 2a ... Seat surface 21, 21C ... Inlet port 23, 23C ... Outlet port 3, 4, 4a ... Valve mechanism (3 ... Piston 4, 4a ... Pressure canceling means (4 ... Pressure canceling chamber, 4a ... Communication path) )
4a: Communication path 6, 6B, 6C: External operation means (shaft)
5 ... Biasing means (pressing coil spring)
8 ... Flush toilet (tankless toilet)
70, 91, 92 ... cam (91 ... first cam, 92 ... second cam)

Claims (4)

In the on- off valve having a water inlet port for taking in water having pressure and a water outlet port for discharging the water in the housing and having a valve mechanism capable of adjusting the opening between the water inlet port and the water outlet port,
The valve mechanism is provided so as to be slidable in the axial direction within the housing by an external operation of an external operating means, and is seated on a seating surface of the housing by sliding to one side in the axial direction. A piston that closes the communication between the water inlet port and the water outlet port and slides away from the seating surface by sliding to the other side in the axial direction to open the communication between the water inlet port and the water outlet port; Pressure canceling means for canceling the pressure received on the other side from the water in the port,
The water inlet port opens to the peripheral surface side of the piston, the water outlet port opens to one end surface side in the axial direction of the piston, and the boundary area between the outer peripheral portion of the piston and the inner wall surface of the housing is sealed And
The pressure canceling means includes a pressure canceling chamber formed on the other side of the piston, an axially extending through the piston, and the water outlet port and the pressure canceling chamber in a state where the piston is seated on the seat surface. off valve, wherein the benzalkonium such a communication passage for communicating the.   2. The on-off valve according to claim 1, wherein the external operation means is a shaft which is fixed to the piston and protrudes from the housing and slides the piston in the axial direction while facing the biasing means.   3. The on-off valve according to claim 2, wherein the urging means urges the piston to one side in the axial direction, and the shaft projects to the one side.   4. The on-off valve according to claim 1, wherein the outlet port is connected to a flush toilet that does not have a toilet flush tank.

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