JPH0454495Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure reducing valve for a low tank used in a high-pressure location in a cold region.

[Conventional technology]

Conventionally, low water tanks for flush toilets used in high-pressure areas generate loud water supply noises, water hammer noises, and vibrations, or if the ball tap seals in the low tank become even slightly worn, water cannot be stopped using the buoyancy of the float alone. There was always an overflow. In order to prevent this, it is sufficient to install a pressure reducing valve in the water supply pipe, and for example, a simple pressure reducing valve such as that disclosed in Japanese Utility Model Application Publication No. 52-38724 has been used. However, with the above pressure reducing valve, even if you try to drain water by operating the antifreeze faucet installed on the primary side, the pressure reducing valve remains closed due to the water pressure in the secondary side piping of the pressure reducing valve. Even if an intake valve is installed in the piping, the pressure reducing valve will not open and water cannot be drained unless the low tank is operated to flow water into the toilet bowl and the secondary piping is released to atmospheric pressure. It was hot. Additionally, in cold regions, water is left in the low tank for nighttime use, and water is drained from the underfloor area, where freezing is most likely, using an antifreeze faucet. When a pressure reducing valve is used, the water in the low tank cannot be drained unless it is flushed into the toilet bowl, so there was also the drawback that it was difficult to leave enough water in the low tank.

[Problem that the invention attempts to solve]

In view of the above points, it is an object of the present invention to provide a pressure reducing valve that can drain water from pipes without having to operate the low tank each time to drain water into the toilet bowl.

[Means for solving problems]

Therefore, in the present invention, a communication hole communicating from the inlet to the outlet is bored in the piston of the pressure reducing valve, and a check valve that blocks only the flow from the inlet to the outlet is housed in the communication hole. This is what I did.

[Effect]

During normal water flow, the check valve 14 prevents the high pressure water on the primary side from leaking to the secondary side. The stop valve 14 opens and the pressure water on the secondary side escapes to the primary side, so the piston 10 is lowered by the spring 11, and as long as an intake valve is provided in the piping, the inside of the piping can be removed without having to operate the low tank each time. This means that water can be removed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 shows a basic embodiment of the present invention.A valve box 1 has an inlet 2 in the upper part of the side wall, an outlet 3 below the inlet 2, and a cylinder 4 inside the inlet 2 above the inlet 2. A downward facing valve seat 5 is provided between the inlet 2 and the outlet 3.
is making a profit. The upper and lower ends are opened, and the bonnet 6 is connected to the upper end and the plug 7 is connected to the lower end by screws. Inside is a ring-shaped gasket 8 that tightly fits the cylinder 4.
A piston 10 to which a plate-shaped gasket 9 is attached is housed, and a spring 11 inserted into the bonnet 6 always receives a downward force. The piston 10 has a communication hole 12 formed therein that reaches from the side to the bottom end between the gaskets 8 and 9 in order to communicate between the inlet and the outlet. A check valve chamber 13 is formed and a ball-shaped check valve 14 is accommodated therein. Further, an O-ring is used to form a check valve seat 15 on which the check valve 14 is seated.

Next, the operating mode of the present invention will be explained.

Figure 1 shows a longitudinal cross-sectional view of the present invention while water is being supplied to a low tank. Water from the inlet 2 passes through the gap between the valve seat 5 and the seal 9, flows into the outlet 3, and then flows from the downstream piping. Water is supplied to the low tank. As the water level in the low tank rises and the ball tap closes, the secondary pressure on the outlet 3 side also rises, and the piston 10 also springs 11.
It rises while compressing the air, reducing the flow rate.
When the ball tap is completely closed, the secondary pressure is at its maximum, the gasket 9 comes into close contact with the valve seat 5, shutting off water on the primary side, and the piston 10 also stops rising. The strength of the spring 11 may be determined in advance so that the secondary pressure at that time becomes the set pressure. If the diameter of the cylinder 4 and the diameter of the portion of the valve seat 5 that contacts the seal 9 are made equal, even if the primary pressure fluctuates in a water-stop state, no vertical force will act on the piston 10, and therefore It is convenient because the secondary pressure does not fluctuate, but it does not make any difference even if there is a slight difference in diameter. In addition, in the water flow state and the water stop state, the check valve 14 is in close contact with the check valve seat 15, and the pressure water on the inflow port 2 side does not flow out to the outflow port 3 side.

Next time you want to drain water from the pipes at night,
All you have to do is put the antifreeze faucet in the drain state, and the inlet 2 side becomes atmospheric pressure, so the secondary pressure on the outlet 3 side becomes higher than the inlet 2 side, and the check valve 14
Push it open and the pressure inside the secondary piping becomes atmospheric. Therefore, the upward pressing force acting on the piston 10 disappears, the piston 10 is pushed down by the spring 11, and the passages of the inlet 2 and the outlet 3 are opened.
Combined with the function of the intake valve installed in the secondary piping, all the water in the piping is discharged from the antifreeze faucet. Therefore, unlike when a conventional pressure reducing valve is installed, there is no need to operate the low tank each time, and the water in the pipe can be drained simply by turning the antifreeze faucet into the draining state.

Next, FIG. 2 shows an embodiment of the present invention in which other functions are added to FIG. 1, and the differences from the one in FIG. 1 are as follows. Note that the same parts in the figure as in FIG. 1 are given the same reference numerals.

In the figure, the valve box 1 is provided with two cylinders 4 and 5' above and below the inlet 2, and a branch port 16 is provided on the outlet 3 side in a direction perpendicular to the plane of the paper, so that secondary pressure is transferred to other locations. It allows water to branch out. Note that an intake valve may be connected to the branch port 16, and there is no need to take the trouble to install an intake valve in the middle of the piping, making the construction work easier. A bonnet 6 having a male thread 17 is screwed to the upper end of the cylinder 4, and a handle 18 having a female thread that engages with the male thread 17 is connected to a pin 19.
It is connected to the piston 10 by. The piston 10 has three ring-shaped gaskets 8, 20, 9 in order from the top.
A communication hole 12 extending from between the gaskets 8 and 20 to the lower end is bored inside, and a check valve 14 is installed with an O-ring 21 that comes into contact with an upward-facing check valve seat 15 provided inside. do.

The operating mode is as follows.

That is, when the water level in the low tank rises from the water flow state shown in the figure and the ball tap is closed, the piston 10 also rises while compressing the spring 11, and the gasket 9 connects to the cylinder 5' and drains the water from the inlet 2. The set pressure is maintained on the outlet 3 side.
At this time, the gasket 20 is not yet in the cylinder 4, so when the water is drained using the antifreeze faucet, the water is drained perfectly as in the case shown in the first diagram.

Next, when the handle 18 is turned from the water-stop state to further raise the piston 10 that is locked to the pin 19, the gasket 20 also comes into close contact with the cylinder 4, and the gasket 9 that is in close contact with the cylinder 5' causes the inlet port to
Completely cut off water from the In this state, even if the pressure on the secondary side reaches atmospheric pressure, the piston 10 will not descend because it is locked by the handle 18, and therefore the pressure reducing valve of the present invention will function as a stop valve. At this time, the inlet 2 and the communication hole 12
Since there is no electrical continuity between the anti-freeze faucet and the main pipe, even if the branch is branched from the branch port 16, negative pressure will be generated on the main pipe side upstream of the antifreeze faucet, and the water in the branch pipe will be sucked into the main pipe side. There is no such problem, and no sewage or hot water gets mixed into the main pipe. If a check valve is provided on the antifreeze faucet or its upstream side and there is no such concern, or if branch piping is not used, the seal 20 may be omitted.

As another example (not shown), a check valve is used that is fitted with a one-way seal that tightly seals the cylinder inside the piston and blocks only the flow of water from the inlet to the outlet. thing,
It is also possible to easily design one in which the spring 11 is adjustable, one in which the handle is operated by a cam mechanism, and one in which the intake valve can be attached to the inlet side. Further, the present invention is not necessarily used only for low tanks, but may also be used as a pressure reducing valve in general households.

[Effect of idea]

As described above, with this invention, water can be drained from the pipes without having to operate the low tank each time, so there is no need to worry about the operation, and the risk of freezing is also reduced. It also has the effect of leaving enough water in the low tank for use.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention in a water-flowing state, and FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the invention, also in a water-flowing state. 1... Valve box, 2... Inlet, 3... Outlet, 4
...Cylinder, 5...Valve seat, 5'...Cylinder,
8,9,20...Putskin, 10...Piston,
11... Spring, 12... Communication hole, 13... Check valve chamber, 14... Check valve, 15... Valve seat, 16... Branch port, 18... Handle.

Claims (1)

[Scope of utility model registration request] A valve box having an inlet 2 above the side wall and an outlet 3 below, a cylinder 4 above the inlet 2 and a cylinder 5' or valve seat 5 between the inlet 2 and the outlet 3 inside. In a pressure reducing valve in which two gaskets 8 and 9 are attached to the inside of the piston 10, and a piston 10 which is always subjected to a downward force by a spring 11 moves up and down to shut off water, the piston 10 has the uppermost end. A communication hole 12 is provided below the packing 8 and opens from the inlet 2 side to below the lowest packing 9 and to the outlet 3 side,
A check valve chamber 13 is formed by expanding a part of the communication hole 12, and a check valve 14 is housed in the check valve chamber 13 for blocking only the flow from the inlet 2 to the outlet 3. A pressure reducing valve for low tanks in cold regions.