JPH1030743A - Spring energized disk type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely close a check valve by preventing the inclination of a disk-shaped valve disk. SOLUTION: An inlet 4 and an outlet 5 are formed by a valve casing comprising an inlet side member 1 and an outlet side member 2. An annular valve seat 6 is provided between the inlet 4 and the outlet 5. A disk-shaped valve disk 7 is arranged on the outlet 5 side of the annular valve seat 6. A coil spring 17 to energize the disk-shaped valve disk 7 is provided. A valve stem 8 is projected on each surface of the disk-shaped valve disk 7. An inlet side guide member 10 and an outlet side guide member 13 with which the outer circumference of the valve stem 8 is brought into slidable contact with each side of the disk- shaped valve disk 7 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a check valve that allows a fluid to flow in one direction but stops the flow in the opposite direction, and more particularly to a spring-loaded disk-type check valve in which a disk-shaped valve body is biased to a valve seat by a spring. In a spring-biased disc check valve, a space must be formed between the outer periphery of the valve body and the valve casing to allow fluid to pass through, and the valve body must be guided so as not to be displaced in the radial direction.

[0002]

2. Description of the Related Art An example of a spring-biased 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 hits the inner surface of the rib,
The fluid is guided so as not to be displaced in the radial direction of the valve body, 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 surface of the valve casing. The disc-shaped valve body is guided so that the outer end of the projection hits the inner peripheral wall surface of the valve casing so as not to be displaced in the radial direction of the valve body, and the fluid flows through the space between the projections. .

[0004]

The above-mentioned prior art spring-loaded disk type check valve can prevent the disk-shaped valve body from being displaced in the radial direction, but the disk-shaped valve body is moved from the annular valve seat. When the valve is opened, the valve may be tilted non-parallel to the valve seat surface due to the effect of fluid flow.When the valve is subsequently closed, the valve cannot return to the state parallel to the valve seat surface. There was a drawback that the surface could not be completely adhered. Therefore, there is a problem that the backflow cannot be completely stopped.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a spring-loaded disk-type check valve capable of preventing the disk-shaped valve body from being tilted and completely closing the valve.

[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. The disc-shaped valve body is arranged on the outlet side of the annular valve seat, and a spring-urged disc-shaped check valve is provided with a spring for urging the disc-shaped valve body to the annular valve seat. The valve stem is protruded, and guide members are provided on both sides of the disc-shaped valve body so that the outer periphery of the valve stem slides.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, valve stems are protruded from both sides of a disc-shaped valve body, and guide members are provided on both sides of the disc-shaped valve body so that the outer periphery of the valve stem slides. Therefore, the disc-shaped valve body does not tilt because the valve stem is guided by the guide member on both sides thereof. Therefore, backflow can be completely prevented.

[0008]

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 with the gasket 3 interposed therebetween. An inlet 4 is formed in the inlet member 1 and an outlet 5 is formed in the outlet member 2. The inlet 4 and the outlet 5 are formed with screws for connecting to the pipe.

An annular valve seat 6 is formed at the inner end of the inlet side member 1. The disc-shaped valve element 7 is arranged on the outlet 5 side of the annular valve seat 6. The disc-shaped valve element 7 is provided with a hole in the center thereof so that the valve stem 8
And is fixed by welding.

An entrance side guide member 10 is formed on the entrance side member 1. The inlet side guide member 10 is formed by forming a guide tube 12 on the central axis of the inlet 4 and the outlet 5 through four ribs 11. The outer circumference slides. Exit side guide member 1 to exit side member 2
Form 3 Similarly to the entrance side guide member 10, the exit side guide member 13 also has the entrance 4 and the exit 5 via four ribs 14.
The guide tube 15 is formed on the central axis of the valve shaft 8, and the outer periphery of the outlet side portion of the valve rod 8 slides on the inner peripheral wall surface of the guide tube 15.

A step 16 is formed in the rib 14 of the outlet side guide member 13, and the coil spring 1 biases the disc-shaped valve body 7 toward the annular valve seat 6 between the step 16 and the disc-shaped valve body 7.
7 is arranged. Also, a step 18 is formed on the rib 14 outside the step 16. The step 18 restricts the moving range by the outer peripheral edge of the disc-shaped valve element 7 being in contact with the stepped element, thereby preventing the coil spring 17 from being excessively compressed.

When the fluid pressure at the inlet 4 is higher than that at the outlet 5, the disc-shaped valve element 7 compresses the coil spring 17 and is displaced toward the outlet 5 and stops against the step 18 of the rib 14 of the outlet side guide member 13. . At this time, the fluid at the inlet 4 flows to the outlet 5 through the space between the ribs 14 of the guide member 13 on the outlet side. If the fluid pressure at outlet 5 is higher than at inlet 4,
The disc-shaped valve element 7 is displaced to the inlet 4 side by the action of the fluid pressure and the action of the coil spring 17 to securely contact the annular valve seat 6.

[0013]

As described above, the present invention provides a disk-shaped valve body in which valve stems are protruded from both sides and guide members are provided on both sides of the disk-shaped valve body so that the outer periphery of the valve stem slides. There is an excellent effect that inclination of the valve body can be prevented and backflow can be completely prevented.

[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 Inlet side member 2 Outlet side member 4 Inlet 5 outlet 6 Annular valve seat 7 Disc-shaped valve element 8 Valve rod 10 Inlet side guide member 11 Rib 12 Guide tube 13 Outlet side guide member 14 Rib 15 Guide tube 17 Coil spring

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. In a spring-biased disc-shaped check valve provided with a spring that urges a valve seat, a valve stem protrudes from both sides of a disc-shaped valve body, and a guide member is provided on both sides of the disc-shaped valve body, where the outer periphery of the valve stem slides. A spring-loaded disk check valve characterized in that it is provided.