JPH06185643A - Check valve - Google Patents

Abstract

PURPOSE:To reduce the wear of a rib by vertically arranging a valve chamber and its inlet and outlet, and forming a spherical valve body into a hollow float made of a metallic shell in a check valve where the spherical valve body seated in a valve seat provided in a valve casing is accommodated in a valve chamber whose inner wall is provided with a plurality of ribs. CONSTITUTION:An inlet side member 1 and an outlet side member 2 which are set vertically are threadedly joined through a gasket to form a valve casing, and a vertically opened valve chamber 4 and an outlet 5 are formed on the outlet side member 2. An annular groove is formed around a valve port 6 on the inner end side of the inlet side member 1, and a valve seat 7 is fitted in the above groove The valve chamber 4 has a plurality of vertically extending ribs 9 formed on its inner wall, and a hollow float 8 which is made of a metallic shell and serves as a spherical valve body guided in the direction of the valve seat 7 by the ribs 9 is accommodated in the valve chamber 4. The hollow float 8 is seated in the valve seat 7 as it is usually energized upward by its buoyancy and the force of a coil spring 15.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional check valve using a spherical valve element has an inlet, a valve chamber and an outlet that are horizontally opened by valve casing, and a valve seat is provided between the inlet and the valve chamber. The spherical valve element which is seated on and off the valve seat is arranged in the valve chamber and a plurality of ribs are formed on the inner wall of the valve chamber. An example of this is shown in Japanese Examined Patent Publication No. 48-27644. The spherical valve body is guided in the direction of the valve seat by the inner surface of the ribs, while the liquid can flow through the passages between the ribs.

[0003]

In this case, since the spherical valve element has a heavy weight, in addition, the spherical valve element has its entire outer surface serving as a contact surface, but the inner wall of the valve contacts only the inner surface of the rib. Since the ribs are worn on the surface, the ribs are displaced, and the valve body is displaced downward by its own weight. Therefore, there is a problem that the inner surface of the ribs located below is significantly worn and the guiding of the spherical valve body is deteriorated. Further, the spherical valve element is difficult to displace because of its heavy weight, and there is a problem that the opening / closing valve is delayed when the pressure difference between the inlet side and the outlet side is small.

Therefore, a technical problem of the present invention is to obtain a check valve which can reduce the wear of the ribs 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 problems is to form an inlet, a valve chamber and an outlet by valve casing, and to form the inlet and the valve chamber. A valve seat is provided between the valve seat, a spherical valve element that is seated on and off the valve seat is disposed in the valve chamber, and a plurality of ribs that guide the spherical valve element to the valve seat are provided on the inner wall of the valve chamber. It is characterized in that the outlet and the outlet are formed side by side in the vertical direction, and the spherical valve element is formed by a hollow float made of a metal shell.

[0006]

The operation of the above technical means is as follows.
The spherical valve element formed of the hollow float can be made lighter in weight than the conventional one, and can be displaced in the vertical direction in parallel with the rib, so that the abrasion of the rib can be reduced. Further, since the spherical valve body is light in weight, it is easily displaced, and the valve can be opened and closed quickly.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). The valve casing is made by screwing the inlet side member 1 and the outlet side member 2 with a gasket interposed.
An inlet 3 is formed in the inlet member 1 in the vertical direction, and a valve chamber 4 and an outlet 5 are formed in the outlet member 2 in the vertical direction. The inlet 3 and the outlet 5 are formed with threads for connecting to the pipe. An annular groove is formed so as to surround the valve opening 6 on the inner end side of the inlet member 1, and the valve seat 7 is fitted into the groove. Inside the valve chamber 4, a hollow float 8 as a spherical valve body made of a stainless steel thin plate is arranged 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 on a concentric circle, and the diameter of the concentric circle is made slightly larger than the diameter of the hollow float 8 so that the hollow float 8 can slidably contact. The hollow float 8 is guided by the inner surfaces of the ribs 9 towards the valve seat 7 and liquid can flow through the passages between the ribs 9.

A spring receiver 12 is provided on a step portion 11 formed in the valve chamber 4.
And place it. The spring receiver 12 has a hole 13 in the center and a plurality of holes 14 around the hole 13. 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 arranged between the bent corner and the hollow float 8.

If the pressure of the liquid on the inlet 3 side is higher than that on the outlet 5 side, the hollow float 8 compresses the coil spring 15 and displaces to the outlet 5 side, and the hollow float 8 separates from the valve seat 7 and leaves the valve opening 6 Open.
The liquid at the inlet 3 passes through the passage between the ribs 9 and the spring bearing 12
Flows through the holes 13, 14 in the outlet to the outlet 5. If the pressure of the liquid on the outlet 5 side becomes higher than that on the inlet 3 side, the hollow float 8
Is due to buoyancy and fluid pressure and the action of the coil spring 15,
It is displaced toward the inlet 3 side while being guided by the rib 9, and is seated on the valve seat 7 to completely close the valve to prevent backflow.

[0011]

The present invention produces the following unique effects. As described above, according to the present invention, it is possible to obtain a check valve that can reduce the wear of the ribs and can quickly open and close the valve. Since the spherical valve element formed by the hollow float is also seated on the valve seat by adding its buoyancy force, the valve can be closed more reliably and leakage does not occur. A spherical valve body made of synthetic resin and having a reduced weight cannot be used in a high temperature and high pressure liquid system. The present invention employs a spherical valve body having a hollow structure made of a metal shell.
Since it is made of glass, it can be used for high temperature and high pressure liquid systems.

[Brief description of drawings]

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

[Explanation of symbols]

 1 inlet side member 2 outlet side member 3 inlet 4 valve chamber 5 outlet 7 valve seat 8 hollow float 9 rib

Claims (1)

[Claims] 1. A valve casing is used to form an inlet, a valve chamber and an outlet, a valve seat is provided between the inlet and the valve chamber, and a spherical valve element which is seated on and off the valve seat is disposed in the valve chamber. In a structure in which a plurality of ribs for guiding the valve body to the valve seat are provided on the inner wall of the valve chamber, the inlet, the valve chamber and the outlet are vertically arranged side by side, and the spherical valve body is formed by a hollow float made of a metal shell. Check valve characterized by having done.