JP2916733B2 - Check valve for liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to a liquid pipe,
The present invention relates to a check valve which allows a liquid to flow in one direction but stops the flow in the opposite direction, and more particularly, to a valve having a spherical valve body which is seated on a valve seat. In a check valve using a spherical valve element,
Since the spherical valve element is easily rolled, it must be guided to a position where it is seated on the valve seat, and a passage through which liquid passes between the spherical valve element and the valve chamber wall must be formed.

[0002]

2. Description of the Related Art A conventional check valve using a spherical valve body forms an inlet, a valve chamber, and an outlet which are opened horizontally by valve casing, and a valve seat is provided between the inlet and the valve chamber. In addition, a spherical valve body that is detachably seated on a valve seat is disposed in a valve chamber, and a plurality of ribs are formed on a valve chamber wall. This example is disclosed in Japanese Patent Publication No. 48-27644. The spherical valve body is guided by the inner surface of the rib in the direction of the valve seat, and liquid can flow through the passage between the ribs.

[0003]

In this case, since the spherical valve element is heavy in weight, in addition, the entire outer surface of the spherical valve element becomes a contact surface, but only the inner surface of the rib contacts the inner wall of the valve chamber. Since the ribs are worn down, the ribs are worn down, and in particular, the valve body is displaced downward by its own weight, so that the inner surfaces of the ribs located below are significantly worn down, and there is a problem that the guide of the spherical valve body is deteriorated. In addition, the spherical valve element is difficult to be displaced due to its heavy weight, and has a problem that the on-off valve is delayed when the pressure difference between the inlet side and the outlet side is small.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a liquid check valve which can reduce the wear of a rib and can open and close the valve quickly.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is that an inlet, a valve chamber and an outlet are formed in a valve casing, and between the inlet and the valve chamber. the valve seat is provided, the spherical valve body is released seated on the valve seat disposed in the valve chamber, in which a plurality of ribs for guiding the spherical valve body on the valve seat provided in the valve chamber wall, an inlet at the top of the valve chamber Exit at the bottom of the valve chamber
The inlet, the valve chamber, and the outlet are formed side by side in the vertical direction, and the spherical valve body is formed of a hollow float made of a metal shell , and the spherical valve body separates from the valve seat and descends to the outlet side.
Allows the flow of liquid from the inlet to the outlet,
By floating and sitting on the valve seat,
Stopping the flow of liquid Ru Oh <br/> the liquid check valve, wherein.

[0006]

The operation of the above technical means is as follows.
The spherical valve body made of a hollow float can be made lighter than the conventional one, and can be displaced in the vertical direction in parallel with the rib, so that the wear of the rib can be reduced. In addition, the spherical valve element is easily displaced due to its light weight, and can be quickly opened and closed.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The valve casing is formed by screwing the inlet side member 1 and the outlet side member 2 through a gasket.
A vertically open inlet 3 is formed in the inlet member 1, and a vertically open valve chamber 4 and outlet 5 are formed in the outlet member 2. The inlet 3 and the outlet 5 are formed with screws for connecting to the pipe. An annular groove is formed around the valve port 6 on the inner end side of the inlet-side member 1, and a valve seat 7 is fitted into the groove. In the valve chamber 4, a hollow float 8 as a spherical valve body made of a thin stainless steel plate is placed in a free state.

The inner wall of the valve chamber 4 is provided with four ribs 9 for guiding the hollow float 8 toward the valve seat 7. The inner surface of the rib 9 is formed concentrically, and the diameter of the concentric circle is slightly larger than the diameter of the hollow float 8 so that the hollow float 8 comes into sliding contact. The hollow float 8 is guided by the inner surface of the rib 9 in the direction of the valve seat 7 and liquid can flow through the passage between the ribs 9.

A spring support 12 is provided on a step 11 formed in the valve chamber 4.
And place it. The spring receiver 12 has a hole 13 at the center and a plurality of holes 14 around the hole. Central hole 1
The edge of 3 is bent toward the inlet 3 side, and a coil spring 15 for urging the hollow float 8 toward the valve seat 7 is disposed between the bent corner and the hollow float 8.

If the pressure of the liquid at the inlet 3 is higher than the pressure at the outlet 5, the hollow float 8 compresses the coil spring 15 and displaces toward the outlet 5, separates from the valve seat 7 and moves away from the valve port 6. Open.
The liquid at the inlet 3 passes through the passage between the ribs 9 and
Through the holes 13, 14 to the outlet 5. If the pressure of the liquid at the outlet 5 is higher than that at the inlet 3, the hollow float 8
Buoyancy and fluid pressure and the action of the coil spring 15
It is displaced toward the inlet 3 while being guided by the ribs 9, sits on the valve seat 7 and completely closes to prevent backflow.

[0011]

The present invention has the following specific effects. As described above, according to the present invention, it is possible to obtain a liquid check valve that can reduce the wear of the rib and can quickly open and close the valve. The spherical valve element formed of the hollow float is seated on the valve seat with the addition of its buoyancy, so that the valve is more reliably closed and no leakage occurs. If the spherical valve body is made of synthetic resin to reduce its weight, it cannot be used for a high-temperature, high-pressure liquid system. In the present invention, since the spherical valve body is made of a hollow float made of a metal shell, it can be used for a high-temperature, high-pressure liquid system.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid check valve according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet side member 2 Outlet side member 3 Inlet 4 Valve room 5 Outlet 7 Valve seat 8 Hollow float 9 Rib

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by a valve casing; a valve seat is provided between the inlet and the valve chamber; and a spherical valve element that is detachably seated on the valve seat is disposed in the valve chamber. in those provided with a plurality of ribs for guiding the valve seat in the valve chamber wall, the upper portion of the valve chamber
The inlet, the outlet is opened at the lower part of the valve chamber, the inlet, the valve chamber, and the outlet are vertically arranged side by side , the spherical valve body is formed by a hollow float made of a metal shell , and the spherical valve body is separated from the valve seat. seat
Liquid from the inlet to the outlet by descending to the outlet side
Allow the body to flow and the spherical valve body floats and sits on the valve seat
A liquid check valve characterized in that the flow of liquid from an outlet to an inlet is stopped by a liquid .