JP2000179704A - Spring energizing disc type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wear-reducible, spring energizing disc type check valve by relieving the sliding/contacting pressure between the bottom end of the outer periphery of a disc-like valve element and the bottom end of the inner peripheral wall of a valve casing. SOLUTION: An inlet port 2, an annular valve seat 3, and an outlet port 4 are formed coaxially in a valve casing 1. Four ribs 5 are disposed on the inner peripheral wall of the valve casing 1, while a gap for the passage of fluid is formed between respectively ribs 5. The inner surfaces of the ribs 5 are all positioned concentrically and at the same distance from the axial center of the outlet/inlet port (4, 2). A disc-like valve element 6 is disposed on the outlet port (4) side of the annular valve seat 3. In the disc-like valve element 6, its diameter is slightly smaller than that of the inner peripheral surface of the rib 5, while the outer periphery loosely slides/contacts on/with the inner peripheral surface of the rib 5. A coil spring 8 for energizing the disc-like valve body 6 toward the annular valve seat 3 is arranged between the disc-like valve body 6 and a spring shoe 7. In the coil spring 8, its axial center is located lower than that of the outlet/inlet ports (4, 2), and it is arranged eccentrically on the lower part side of the disc-like valve element 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is mounted on a fluid pipe to permit one-way flow of a fluid, but to stop the flow in the opposite direction. The present invention relates to an energized spring-biased disc check valve. In the spring-biased disc check valve, the outer periphery of the disc-shaped valve body is slidably guided by the inner peripheral wall of the valve casing, and a fluid passage between the outer periphery of the disc-shaped valve body and the inner peripheral wall of the valve casing is provided. A gap must be formed.

[0002]

2. Description of the Related Art An example of a spring-loaded disk check valve is disclosed in Japanese Utility Model Publication No. 49-36740. This is achieved by providing an annular valve seat in a valve casing having an inlet and an outlet, disposing a disc-shaped valve body biased by a coil spring on the outlet side of the annular valve seat, and forming a rib on the inner peripheral wall of the valve casing. And the outer periphery of the disc-shaped valve element is slid on the inner surface of the rib. The outer periphery of the disc-shaped valve element is guided in sliding contact with the inner surface of the rib, and the fluid flows through the space between the ribs.

A spring-loaded disk type check valve disclosed in Japanese Utility Model Laid-Open Publication No. 60-10964 has a cylindrical inner wall of a valve casing and a projection provided on the outer periphery of a disk-shaped valve body. The outer end of the projection is brought into sliding contact with the inner peripheral wall of the valve casing. The outer end of the protrusion of the disc-shaped valve is a valve case.
The fluid is guided in sliding contact with the inner peripheral wall of the shing, and the fluid flows through the space between the projections.

[0004]

In the above-mentioned prior art spring-loaded disc type check valve, the lower end of the outer periphery of the disc-shaped valve body and the lower end of the inner peripheral wall of the valve casing with which the lower end of the outer periphery of the disc-shaped valve body slides. However, there is a problem that the guide of the disk-shaped valve body is deteriorated due to wear. This is because the disk-shaped valve element is displaced downward by its own weight, so that the lower end of the outer periphery always comes into sliding contact with the lower end of the inner peripheral wall of the valve casing.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spring-loaded disk check valve which can reduce abrasion by reducing the sliding contact between the lower end of the outer periphery of the disc-shaped valve body and the lower end of the inner peripheral wall of the valve casing. It is to be.

[0006]

In order to solve the above-mentioned technical problems, the technical means of the present invention is to form an inlet and an outlet by valve casing, and to form an annular valve seat between the inlet and the outlet. Is provided, a disc-shaped valve body is disposed on the outlet side of the annular valve seat, a spring for urging the disc-shaped valve body against the annular valve seat is provided, and the outer periphery of the disc-shaped valve body is slidably guided by the inner peripheral wall of the valve casing. And a clearance is formed between the outer periphery of the disc-shaped valve body and the inner peripheral wall of the valve casing, and the spring is eccentrically provided below the disc-shaped valve body. A feature of the invention is a spring-loaded disk check valve.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a spring for biasing a disc-shaped valve body against an annular valve seat is provided eccentrically below the disc-shaped valve body. For this reason, the disc-shaped valve element is often opened with its upper end inclined to the outlet side with the lower end as a fulcrum, or the upper side is more displaced toward the outlet side than the lower side to open. Therefore, sliding contact between the lower end of the outer periphery of the disc-shaped valve body and the lower end of the inner peripheral wall of the valve casing can be reduced, and wear can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In FIG. 1, the valve case of this embodiment is shown.
The sing 1 is disposed between an inlet-side pipe flange and an outlet-side pipe flange (not shown) and is sandwiched by fastening means including bolts and nuts. An inlet 2, an annular valve seat 3, and an outlet 4 are formed coaxially in a valve casing 1.

[0009] Four ribs 5 are provided on the inner peripheral wall of the valve casing 1. The inner surfaces of the ribs 5 are all located on concentric circles and are formed equidistant from the axis of the entrance. The disk-shaped valve element 6 is arranged on the outlet 4 side of the annular valve seat 3. The diameter of the disc-shaped valve element 6 is slightly smaller than the diameter of the inner surface of the rib 5, and the outer periphery of the disk-shaped valve element 6 slidably contacts the inner surface of the rib 5. The outer circumference of the spring receiver 7 is fitted and arranged in the groove of the rib 5, and a coil spring 8 for urging the disk-shaped valve element 6 against the annular valve seat 3 is arranged between the disk-shaped valve element 6 and the spring receiver 7.

The spring receiver 7 has a plurality of fluid passage holes 9 at the center and the periphery thereof, the outer peripheral side is bent toward the inlet 2, and the outer peripheral side is bent toward the inner peripheral wall side of the valve casing 1. One end of the coil spring 8 fits into the corner bent toward the side, and the outer end bent toward the inner peripheral wall of the valve casing 1 fits into the groove of the rib 5. The axis of the coil spring 8 is positioned lower than the axis of the entrance and exit, and is eccentrically disposed below the disc-shaped valve body 6.

When the fluid pressure at the inlet 2 becomes higher than that at the outlet 4, the disc-shaped valve 6 is displaced toward the outlet 4 against the urging force of the coil spring 8, and the fluid at the inlet 4 flows into the space between the ribs 5. Through to exit 4. In the present invention, since the axis of the coil spring 8 is eccentric to the lower side from the center of the disc-shaped valve body 6, the disc-shaped valve body 6 is tilted from its lower end to the outlet 4 side with its lower end serving as a fulcrum. Or the upper side is more displaced toward the outlet 4 side than the lower side to open the valve more frequently, and the sliding contact between the lower end of the outer periphery of the disc-shaped valve body 6 and the lower end of the inner peripheral wall of the valve casing 1 is reduced. Wear can be reduced. When the fluid pressure of the outlet 4 becomes higher than that of the inlet 2, the disc-shaped valve body 6 is displaced toward the inlet 2 by the action of the fluid pressure and the action of the coil spring 8 and comes into contact with the annular valve seat 6 in a secure manner.

[0012]

As described above, according to the present invention, the spring for biasing the disc-shaped valve body toward the annular valve seat is eccentrically provided on the lower side of the disc-shaped valve body, so that the outer periphery of the disc-shaped valve body is provided. The wear of the lower end and the lower end of the inner peripheral wall of the valve casing can be reduced, and an excellent effect that the disc-shaped valve element can be guided reliably can be obtained.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inlet 3 Annular valve seat 4 Outlet 5 Rib 6 Disc-shaped valve element 7 Spring receiver 8 Coil spring 9 Fluid passage hole

Claims (1)

[Claims] An inlet and an outlet are formed by valve casing, an annular valve seat is provided between the inlet and the outlet, a disc-shaped valve body is disposed on the outlet side of the annular valve seat, and the disc-shaped valve body is annularly formed. A spring for urging the valve seat is provided to guide the outer periphery of the disc-shaped valve body in sliding contact with the inner peripheral wall of the valve casing and to allow a fluid to pass between the outer periphery of the disc-shaped valve body and the inner peripheral wall of the valve casing. A spring-loaded disk-type check valve, characterized in that the spring is eccentrically provided below a disk-shaped valve body in an empty space.