JPH0523899Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a pressure reducing valve that is installed in a fluid flow path such as a water pipe and maintains a constant water pressure on the secondary side, and also has check and water stop functions. Regarding a pressure reducing water stop valve with added.

[Conventional technology and its issues]

For example, in a general water supply system, a meter box is placed in the pipe that branches from the main pipe to the consumption side, and water stop valves, pressure reducing valves, check valves, etc. are installed from the upstream side of the meter installed in the box. These meter boxes were arranged in sequence to adjust the flow rate particularly in areas with high water pressure and to deal with the adverse effects on the piping system caused by abnormal pressure increases due to water hammer, etc. However, in many cases, these meter boxes were buried underground. Because of this, its dimensions can be reduced to the necessary minimum, so it is easy to connect the above valves, repair,
It used to be very difficult to attach and detach them for inspection and other purposes.

In addition, the independent pressure reducing valve that has been widely used in the past is
Due to its structure, it was extremely difficult to adjust the pressure while water was flowing, and even to replace a single pressure adjustment spring, the entire valve had to be disassembled.
Therefore, there were many problems in terms of workability on site.

[Means to solve the problem]

In view of these circumstances, the present invention organically incorporates the water stop valve, pressure reducing valve, and check valve that should be arranged in the meter box into one valve box, and at the same time, improves the structure of the pressure reducing valve in particular. By adding
This solves all the problems of narrative in one fell swoop.

That is, a water shutoff chamber such as a ball valve or a piece-shaped valve is installed in the water shutoff chamber of the valve box, which is integrally provided with a depressurization chamber that communicates from a water shutoff chamber with an inlet and an outflow port on the left and right sides to the outflow port side. In addition, the decompression chamber is equipped with a decompression mechanism part, which is made up of a slidable case-type valve body that fits into a nut with a valve seat and allows the amount of decompression to be adjusted using a bushing. This is a characteristic feature.

[Effect]

The pressure reduction water stop valve of the present invention having the above configuration adjusts the secondary fluid to a predetermined pressure while the fluid flowing down from the water stop mechanism to the pressure reduction chamber passes through the pressure reduction mechanism and is discharged from the outlet. If the secondary side fluid rises higher than the primary side fluid pressure and a backflow is about to start, the check valve has the function of reliably blocking the flow path, and the depressurization mechanism section in the decompression chamber Since the case-type valve element with a built-in check function and the nut with a valve seat are integrated, the entire pressure reducing mechanism can be easily attached and detached by attaching and detaching the nut. By rotating, the pressure can be freely adjusted even when water is flowing.

〔Example〕

Hereinafter, the structure of the present invention will be described in more detail based on the embodiment shown in the drawings. In FIG. It is comprised of a water cutoff chamber and a decompression chamber that communicate with each other via the first through hole B. In addition, 2 is a water stop mechanism section consisting of a ball valve E, etc., which allows the inlet A to be opened and closed freely in the water stop chamber; 3
is a decompression mechanism part that is removably inserted into the decompression chamber, and a nut 4 with a valve seat is screwed into the chamber.
and a case-type valve body F that is guided by its inner surface and can slide a certain distance (a second valve body).
(see figure), this case-type valve body F consists of two front and rear cylindrical parts 5 and 6 that are screwed into each other, and the front cylindrical part 5 has a sliding surface 5' around its rear edge and a reverse side as described below. It has a built-in stop valve G. Also, the rear cylinder part 6
is fitted and supported by the nut 4 with a valve seat, so that the valve seat 4' faces the sliding surface 5' of the front cylinder portion 5. Further, numeral 7 is a bush screwed onto the valve seat nut 4, and presses the rear cylindrical portion 6 through a spring 8 in an adjustable manner.

Furthermore, the structure of the check valve G built in the front cylinder part 5 is not particularly limited, but it is necessary to avoid check valves that have directionality during use, such as ball type or swing type. As shown in Fig. 1, a check valve G is attached with a snap spring so that the valve body b, which has a stroke within a certain range relative to the valve seat a, is biased in relation to the spring c and the spring receiver d. Preferably, it is fixed to the front cylinder portion 5 by e.

In the figure, reference numeral 9 indicates a strainer, 10 indicates packing or O-rings provided at various locations on the above-mentioned members, and 11 indicates a handle for opening and closing the ball valve.

Next, to describe the operation of each part of the decompression water stop valve of the present invention in the open state, the fluid flowing into the decompression chamber from the inlet A through the water stop ball valve E and the first through hole B is From the through hole part of F to the second through hole C
It flows down to the outflow port D via the button 7, and the amount of passage is determined by the amount of gap between the valve seat 4' of the valve seat nut 4 and the sliding surface 5' of the case-type valve body, which is adjusted in advance by the bush 7. The amount of water is limited and a predetermined water pressure is maintained. On the other hand, if the fluid on the secondary side attempts to flow back to the primary side for some reason, the valve body b of the check valve, which is biased by the spring c, operates and immediately closes the valve seat a. This makes it possible to reliably prevent backflow of the side fluid.

[Effect of idea]

According to the pressure reducing water stop valve of the present invention described above, the following effects can be obtained.

Since the water stop valve, pressure reducing valve, and check valve are incorporated into one valve case, the overall face-to-face dimension is minimized, unlike the conventional case where each independent valve mechanism is arranged in series. It is particularly advantageous for use in water supply meter boxes where installation space is limited.

Due to the structure of the pressure reduction mechanism, the amount of pressure reduction can be freely adjusted using a bushing even during water flow.

The pressure adjustment spring can be easily replaced by simply removing the bushing.

Also, when inspecting or repairing the case type valve body,
Previously, it was necessary to remove them from the piping system and disassemble the valve each time, but by removing the nut with the valve seat, the pressure reducing mechanism can be taken out as a whole, reducing the cost and time required for repairs. The savings are significant.

The pressure reducing water stop valve of this invention has no directionality when used in the pressure reducing valve/check valve, so there is no problem in using it even if the water stop chamber and the pressure reducing chamber are oriented either vertically or horizontally.

Furthermore, because the water shutoff mechanism and the pressure reduction mechanism are located close to each other in one valve case, conventionally, when shutting off water on the primary side, it is no longer necessary to find a location to install a check valve. There is no problem, and the workability is good.

The depressurizing water stop valve of this invention, which brings about the above-mentioned remarkable effects, is advantageous for centralized control and maintenance, and is therefore not limited to use in the above-mentioned water meter boxes, but can also be used to reduce pressure in fluid piping systems such as in general factories. It also has wide applicability as a valve.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the central part of the proposed pressure reducing water stop valve, and Figure 2 is a perspective view showing the state in which the front and rear cylinder parts of the pressure reducing mechanism (excluding the check valve) are separated. be. In addition, in the figure, 1...Valve box, 2...Water stop mechanism part, 3
...Pressure reducing mechanism part, 4...Nut with valve seat, 5...Front cylinder part of case-type valve body F, 6...Same rear cylinder part, 7
...butsuyu, 8...indicates a spring.

Claims (1)

[Scope of utility model registration request] A valve box 1 is provided with a water shutoff chamber having an inlet and an outflow port, and a depressurization chamber that communicates with each other. , and the other side is slidably equipped with a case-type valve body that fits into a nut 4 with a valve seat and allows the amount of pressure reduction to be adjusted by a bush 7. Features a pressure reducing water stop valve.