JPS6113815Y2 - - Google Patents

Description

[Detailed description of the invention] This invention automatically controls the flow rate within a certain limit regardless of fluctuations in water pressure, absorbs the water hammer phenomenon, and prevents suction. , for example, to provide a highly effective stop valve when installed immediately before a water meter or the like.

The gist of the present invention is that a cylindrical sub-valve body that fits into the valve port and faces in the vertical direction is connected to the lower surface of the main valve body, and that a cylindrical sub-valve body is provided on the side surface of the sub-valve body that extends downwardly. In addition to forming an appropriate number of water passage grooves to reduce the water area, a valve rod is provided upwardly protruding from the center of the upper surface of the main valve body, and its upper end is connected to the upper surface of the valve casing. A spring holder is inserted through the bottom plate of the spring chamber facing toward A compression spring installed in the spring chamber urges the spring receiver downward, and a compression spring installed coaxially in the spring chamber is used. The threaded part at the center of the push rod is screwed into the screw hole in the upper part of the spring chamber, and the upper end of the push rod, which protrudes from the upper end of the spring chamber, is rotated appropriately to move the push rod up and down. The point is that the flow rate control stop valve is configured such that the upper end of the valve rod is pressed through the above-mentioned through hole.

Since the present invention has the above-described configuration, the following effects unique to the present invention are produced.

First, because the water passage groove provided in the sub-valve body is designed so that the water passage area becomes smaller as it goes downward, the pressure difference between the primary and secondary sides of the main valve body increases, causing As the flow rate increases, the cross-sectional area of the flow path becomes smaller, and the total flow rate becomes approximately constant.

Second, since a gap of the required width is provided between the valve rod connected to the upper part of the main valve body and the spring holder, the main valve body rises regardless of the bias of the spring while the pressure difference is small. However, when the pressure difference increases, the top surface of the valve rod comes into contact with the spring holder and rises against the bias of the spring, making it more reliable to keep the total flow constant and reducing the pressure caused by the water hammer phenomenon. can absorb sudden increases in

Thirdly, when the pressure on the primary side becomes lower than the pressure on the secondary side, the main valve element descends under its own weight and completely closes the side surface of the auxiliary valve element, thereby preventing backflow. Therefore, if the present invention is used as a water meter valve, it is convenient because it functions as a check valve when water is cut off.

Fourthly, when the threaded portion is lowered and the main valve body is fitted into the valve port, the main valve body does not move up and down, which is convenient for replacing meters, repairing water pipes, etc.

Although the present invention has the above-described configuration and unique effects, it will be described in more detail below based on the embodiments shown in the accompanying drawings.

A partition wall 2 is provided at the center of the valve housing 1, and an inlet 3 and an outlet 4 are provided at both left and right ends, respectively.

A valve port 5 facing in the vertical direction is bored in the central horizontal portion of the partition wall 2, and a main valve body 7 is in close contact with a valve seat 6 on the upper surface of the valve port 5.

A cylindrical sub-valve body 8 is connected to the center of the lower surface of the main valve body 7 and is slidably fitted into the valve port 5 .

On the side surface of the sub-valve body 8, there are a water passage groove 9 that reaches from the upper end to the lower end, a water passage groove 10 that reaches from the upper end to almost the center part, and a water passage groove 11 that ends above the water passage groove 9.
Appropriate numbers of each are cut out.

A short valve rod 12 is provided in the center of the upper surface of the main valve body 7 to protrude upward, and a vertical guide groove 13 is cut in the lower side of the valve rod 12.

A cylindrical spring chamber 14 facing upward is connected to the center of the upper surface of the valve housing 1, and the upper end of the valve rod 12 is inserted through the bottom wall 14a of the spring chamber 14 with a required slit. There is.

The set screw 1 rotates from the side of the downward cylindrical boss 14b at the center of the lower surface of the bottom wall 14a of the spring chamber 14.
5 is screwed into the guide groove 13, and its inner end engages with the guide groove 13.

A spring receiver 16 having an upward recessed hole 16a on the lower side is loosely installed in the inner lower part of the spring chamber 14.

The lower end of the spring receiver 16 is the bottom wall 1 of the spring chamber 14.
4a, a slight gap is formed between the lower surface of the upward recessed hole 16a and the upper surface of the valve rod 12.

A through hole 19 having a smaller diameter than the valve rod 12 is bored in the center of the spring receiver 16 .

The lower surface of the push rod 20, which is slidably inserted into the through hole 19 from above, is in contact with the upper surface of the valve rod 12.

A protruding annular sealing valve body 21 is provided approximately at the center of the push rod 20, and a downward annular sealing member is provided at a location corresponding to the sealing valve body 21 at the center of the lower surface of the top wall 14c of the spring chamber 14. A stop valve seat 22 is provided protrudingly.

A threaded portion 23 cut directly above the sealing valve body 21 in the push rod 20 is screwed into a screw hole 24 bored in the center of the top wall 14c of the spring chamber 14.

A compression spring 25 is fitted into the spring chamber 14 and urges the spring receiver 16 downward.

A handle 26 is attached to the upper end of the push rod 20 that protrudes from the upper part of the spring chamber 14.

When the handle 26 is operated, the push rod 20 is screwed down and the main valve body 7 is pressed against the valve seat 6 via the valve rod 12 to be in a closed state.

Note that the inside of the spring chamber 14 is always filled with water.

When the push rod 20 is pulled up to the upper limit by operating the handle 26, as shown by the imaginary line, the sealing valve body 2
1 is in close contact with the sealing valve seat 22, and the spring chamber 14 is kept even more watertight.

The main valve body 7, the sub-valve body 8, and the valve rod 12, which are integrated, are pushed up by the water pressure difference between the inlet port 3 and the outlet port 4, and the water passes through the water passages 9, 10, and 11 and reaches the valve port. Pass 5.

Since the water passage grooves 10 and 11 are bored above the center of the side surface of the sub-valve body 8, the greater the water pressure difference and the higher the sub-valve body 8 is, the more the sub-valve body 8 is hidden inside the valve port 5. ,
Even if the water passage resistance is increased and the water pressure difference is increased, the amount of water passing through the valve port 5 does not increase.

When the water pressure difference further increases, the upper end of the valve rod 12 that has been pushed up comes into contact with the lower surface of the spring receiver 16.

Since the spring receiver 16 is urged downward by the spring 25, it cannot be easily pushed up.
Further, since the water passage grooves 10 and 11 are almost completely closed, the resistance to passing through the valve port 5 further increases, and the amount of water passing through does not increase.

The above-mentioned flow rate control effect depends on the size of the valve port 5, the shape and size of the water passage grooves 9, 10, and 11, the gap between the valve rod 12 and the spring receiver 16, and the spring 2.
The strength of 5 can be set appropriately and as desired.

Furthermore, when the water pressure difference is small and there is a gap between the upper end of the valve rod 12 and the lower surface of the upward concave hole 16a of the spring receiver 16, there is no resistance from the spring 25, and the valve simply operates as a check valve. Therefore, the decrease in flow rate is slight.

When the water hammer phenomenon occurs, the upper end of the valve lever 12 pushes up the spring receiver 16, and the spring receiver 16 tries to rise rapidly against the spring 25.

However, since the spring chamber 14 is filled with water, the valve rod 12 cannot rise rapidly, and the water in the spring chamber 14 fills the gap between the valve rod 12 and the bottom wall 14a of the spring chamber 14. , passing downward little by little and rising gradually as it is eliminated. The same applies to the case of descent.

In this way, the rapid rise and fall of both valve bodies 7 and 8 is suppressed, and the water hammer phenomenon is absorbed.

When the water pressure difference is 0, the main valve body 7 assumes the closed position due to its own weight, so the reliability as a check valve is high.

Further, as described above, by operating the handle 26, water can be stopped in the same way as a normal stop valve.

Water meter failures, other than the intrusion of foreign matter, are caused by overload due to excessive flow rate or water hammer phenomenon when water starts flowing or when water is cut off. Therefore, the valve of this invention can be installed just before the water meter. It is particularly effective.

[Brief explanation of the drawing]

The drawing is a central longitudinal sectional front view of the valve according to the present invention. 1... Valve housing, 2... Partition wall, 2... Inflow port, 4...
...outflow port, 5...valve port, 6...valve seat, 7...main valve body, 8...subvalve body, 9, 10, 11...water flow groove,
12... Valve lever, 13... Guide groove, 14... Spring chamber, 14a... Bottom wall, 14b... Boss, 14c...
... Top wall, 15 ... Rotation set screw, 16 ... Spring receiver, 16a ... Upward concave hole, 17 ... Slit, 18 ... Gap, 19 ... Through hole, 20 ... Push rod, 21...Sealing valve body, 22...Sealing valve seat, 23
...Threaded portion, 24...Threaded hole, 25...Spring, 26
……handle.

Claims (1)

[Scope of utility model registration request] A cylindrical sub-valve body 8 that fits into the valve port 5 and faces in the vertical direction is provided on the lower surface of the main valve body 7, and the water flow area becomes smaller as it goes downward. In addition to forming an appropriate number of water passage grooves 9, 10, 11, a valve rod 12 is provided to protrude upward from the center of the upper surface of the main valve body 7, and its upper end is connected to the upper surface of the valve housing 1. The main valve body 7 has a spring retainer 16 which penetrates the bottom wall 14a of the spring chamber 14 facing upward and has a through hole 19 in the center thereof, which is smaller in diameter than the valve rod 12, in the inner lower part of the spring chamber 14. When in the closed state, the compression spring 2 is fitted so that a gap 18 of a required width is created between the upper surface of the valve rod 12 and the compression spring 2 installed in the spring chamber 14.
5 to urge the spring receiver 16 downward,
In addition, the screw portion 23 at the center of the push rod 20 provided coaxially with the spring chamber 14 is inserted into the screw hole 23 at the top of the spring chamber 14.
A push rod 2 that is screwed into the spring chamber 14 and protrudes from the upper end of the spring chamber 14
By appropriately rotating the upper end of 0 and raising and lowering the push rod 20, the lower end thereof passes through the through hole 19 and presses the upper end of the valve rod 12.