JP2916732B2 - 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 easily rolls, it must be guided to a position to be seated on the valve seat and held at the seated position. Further, a passage through which the liquid passes must be formed between the spherical valve body and the valve chamber wall.

[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 the valve chamber wall, and a rib located below the spherical valve body is a float seat. This example is disclosed in Japanese Patent Publication No. 48-27644. The spherical valve body is guided in the direction of the valve seat by the inner surface of the rib, and is held at a position seated on the valve seat by the float seat. Liquid can also 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. There is a problem in that the ribs are worn and the guiding of the spherical valve body is deteriorated. In particular, since the spherical valve element is displaced downward by its own weight, there is a problem that the wear of the float seat located below is remarkably advanced, and the valve cannot be completely closed.

Accordingly, it is an object of the present invention to provide a check valve for a liquid which can reduce wear of a rib, particularly wear of a float seat.

[0005]

Means for Solving the Problems In order to solve the above technical problem, the technical means of the present invention is to form an inlet, a valve chamber, and an outlet which are opened in a horizontal direction in a valve casing. A valve in which a valve seat is provided between valve chambers, a spherical valve body which is detachably seated on the valve seat is arranged in the valve chamber, and a plurality of ribs for guiding the spherical valve body to the valve seat are provided on the valve chamber wall. the body is formed with a hollow float made of metal shells, the rib located above the hollow float, liquids check that the hollow float, characterized in that the abutting float seat in the hollow float position seated on the valve seat In the valve .

[0006]

The operation of the above technical means is as follows.
Since the spherical valve element formed of the hollow float can be made lighter than the conventional one, wear of the ribs with which the spherical valve element contacts can be reduced. Further, since the spherical valve body contacts the upper float seat by buoyancy, the wear of the float seat can be reduced more than that in which the spherical valve body contacts the lower float seat by its own weight.

[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.
An inlet 3 that opens horizontally is formed in the inlet member 1, and a valve chamber 4 and an outlet 5 that opens horizontally 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 and 10 for guiding the hollow float 8 toward the valve seat 7. Hollow flow
The inner surfaces of the three ribs 9 located below and on the side of the floor 8 are formed concentrically and slightly larger than the diameter of the hollow float 8 so that the hollow float 8 slides loosely. A rib located above the hollow float 8 is formed as a float seat 10. The inner surface of the float seat 10 has a hollow float 8
Is seated on the valve seat 7 and the hollow float 8 is in a position where the valve is completely closed.
Is formed at a position where it comes into contact with.

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 rib 9 and the float seat 10 and flows to the outlet 5 through the holes 13 and 14 of the spring receiver 12. When the pressure of the liquid at the outlet 5 becomes higher than that at the inlet 3, the hollow float 8 receives the action of the fluid pressure and the coil spring 15 and is guided by the rib 9 and the float seat 10 to the inlet 3 side. At the position seated on the valve seat 7 and held on the float seat 10 to completely close the valve to prevent backflow.

[0011]

The present invention has the following specific effects. As described above, according to the present invention, the wear of the ribs and the float seat can be reduced, so that the spherical valve body can be reliably guided in the valve seat direction, and can be securely held at the position where the spherical valve body is seated on the valve seat. Can,
Backflow can be completely prevented. 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 and 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 10 Float seat

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet, which are opened in a horizontal direction in a valve casing, are formed, a valve seat is provided between the inlet and the valve chamber, and a spherical valve body that is detachably seated on the valve seat is disposed in the valve chamber. A plurality of ribs for guiding the spherical valve body to the valve seat are provided on the inner wall of the valve chamber. The spherical valve body is formed of a hollow float made of a metal shell, and the rib located above the hollow float is replaced with the hollow float. There check valve for liquids, characterized in that the abutting float seat in the hollow float position seated on the valve seat.