JP5295861B2 - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve capable of closing completely an annular valve seat by a disk-like valve element, even when the disk-like valve element abuts on the annular valve seat under an inclined state, when seated onto the annular valve seat. <P>SOLUTION: An inlet 1, a valve chest 5 and an outlet 3 are formed of a valve casing comprising an inlet side member 2 and an outlet side member 4. The annular valve seat 6 is provided between the inlet 1 and the valve chest 5, and the disk-like valve element 7 for opening and closing the annular valve seat 6 is arranged in an inside of the valve chest 5. A coil spring 13 for biasing the disk-like valve element 7 toward the annular valve seat 6 is arranged in the inside of the valve chest 5. A guide hole 8 is formed on an outlet 3 side face of the disk-like valve element 7, and a guide rod 11 is formed, in an outlet side member 4, to slide-contact with an inner circumference of the guide hole 8. Round-processing is executed in an outlet 3 side end inner circumference of the guide hole 8, and round-processing is executed in an inlet 1 side end outer circumference of the guide rod 11. A round-processed portion 15 of the guide hole 8 is engaged with a round-processed portion 16 of the guide rod 11, in the position where the disk-like valve element 7 is seated on the annular valve seat 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a check valve which is attached to a fluid pipe such as liquid or gas and allows a forward flow of fluid from the inlet to the outlet, but prevents the flow in the reverse direction, that is, the flow from the outlet to the inlet. The present invention relates to a structure for guiding a valve body to an annular valve seat.

A conventional check valve is disclosed in Patent Document 1, for example. The valve casing forms an inlet, a valve chamber, and an outlet. An annular valve seat is provided between the inlet and the valve chamber. A disc-shaped valve body that opens and closes the annular valve seat is disposed in the valve chamber. Is provided on the inner peripheral wall of the valve casing. is there. When the fluid pressure at the inlet becomes larger than the fluid pressure at the outlet and the biasing force of the coil spring, the disc-like valve body compresses the coil spring and moves away from the annular valve seat, and the inlet fluid is located between the protrusions on the outer circumference of the disc-like valve body. Flow through to the exit. When the fluid pressure at the inlet becomes smaller than the fluid pressure at the outlet and the biasing force of the coil spring, the disc-shaped valve body is displaced toward the inlet and is seated on the annular valve seat, thereby preventing the backflow of fluid from the outlet to the inlet.

Japanese Utility Model Publication No. 60-10964

When the disc-shaped valve element is in contact with the annular valve seat in a tilted state when the disc-shaped valve element is seated on the annular valve seat, the protrusion on the outer periphery of the disc-shaped valve element causes the cylindrical surface of the valve casing inner wall to slide. Therefore, there is a problem that the disc-shaped valve body cannot completely close the annular valve seat and fluid leaks from the outlet to the inlet.

Therefore, the problem to be solved by the present invention is that the disc-shaped valve body can completely close the annular valve seat even if it contacts the annular valve seat in a tilted state when the disc-shaped valve seat is seated on the annular valve seat. Is to provide a stop valve.

In order to solve the above problems, a check valve according to the present invention is a disc in which an inlet, a valve chamber, and an outlet are formed in a valve casing, an annular valve seat is provided between the inlet and the valve chamber, and the annular valve seat is opened and closed. When the disc-shaped valve body is arranged in the valve chamber and a coil spring is provided to bias the disc-shaped valve body toward the annular valve seat, a guide hole is formed on the outlet side surface of the disc-shaped valve body, and the inner periphery of the guide hole slides. At the position where the guide rod is in contact with the valve casing, the inner periphery of the outlet end of the guide hole is rounded, the outer periphery of the inlet end of the guide rod is rounded, and the disc-shaped disc is seated on the annular valve seat. A portion of the guide hole subjected to R machining is fitted to a portion of the guide rod subjected to R machining.

According to the present invention, the guide hole is formed on the outlet side surface of the disc-shaped valve body, the guide rod with which the inner periphery of the guide hole is slidably contacted is formed on the valve casing, and the inner periphery of the guide hole is subjected to R machining. The outer periphery of the inlet end of the guide rod is rounded, and the portion where the disc-shaped valve body is seated on the annular valve seat is fitted with the portion of the guide rod which has been rounded. Therefore, the disc-shaped valve body can be tilted in all directions at the position where it abuts against the valve seat member, and when the disc-shaped valve body is seated on the annular valve seat, the disc-shaped valve body abuts against the annular valve seat. However, the disc-shaped valve body can completely close the annular valve seat, and an excellent effect is obtained that fluid does not leak from the outlet to the inlet.

It is sectional drawing of the non-return valve concerning embodiment of this invention.

An inlet side member 2 having an inlet 1 and an outlet side member 4 having an outlet 3 are screwed together to form a valve casing having a valve chamber 5 between the inlet 1 and the outlet 3. An annular valve seat 6 is formed at the inner end of the inlet side member 2. A disc-shaped valve body 7 for opening and closing the annular valve seat 6 is disposed in the valve chamber 5. A guide hole 8 is formed in the center of the side surface of the outlet 3 of the disc-shaped valve body 7. A guide member 9 is formed integrally with the outlet side member 4. The guide member 9 has a guide rod 11 formed on the central axes of the inlet 1 and the outlet 3 via four ribs 10, and the inner periphery of the guide hole 8 of the disc-like valve body 7 is formed on the outer periphery of the guide rod 11. Make sliding contact. The inner diameter of the guide hole 8 is made slightly larger than the outer diameter of the guide bar 11 so as to come into sliding contact with the guide bar 11 loosely. A step portion 12 is formed on the rib 10 of the guide member 9, and a coil spring 13 for urging the disc-like valve body 7 toward the annular valve seat 6 is disposed between the step portion 12 and the disc-like valve body 7. A step portion 14 is formed outside the step portion 12 on the rib 10, and the step portion 14 restricts the range of movement of the disc-like valve body 7 in the valve opening direction, thereby preventing the coil spring 13 from being excessively compressed.

R machining is performed on the inner periphery 15 on the outlet 3 side end of the guide hole 8 of the disc-like valve body 7. R machining is performed on the outer periphery 16 of the guide rod 11 on the inlet 1 side end of the guide member 9. At the position where the disc-like valve body 7 is seated on the annular valve seat 6, the portion 15 where the guide hole 8 is subjected to R machining and the portion 16 where the guide rod 11 is subjected to R machining are fitted. Therefore, the disc-like valve body 7 can be tilted in all directions at the position where it abuts on the valve seat member 6, and abuts against the annular valve seat 6 in a tilted state when the disc-like valve body 7 is seated on the annular valve seat 6. However, the disc-like valve body 7 can completely close the annular valve seat 6, and fluid does not leak from the outlet 3 to the inlet 1.

Next, the operation of the check valve 1 of this embodiment will be described. When fluid flows in from the inlet 1 and the fluid pressure becomes larger than the fluid pressure on the outlet 3 side and the biasing force of the coil spring 13, the disc-shaped valve body 7 compresses the coil spring 13 and separates from the annular valve seat 6, It displaces to the exit 3 side and stops by hitting the step 14 of the rib 10 of the guide member 9. As a result, the fluid at the inlet 1 flows between the ribs 10 of the guide member 9 to the outlet 5. When the fluid pressure at the inlet 1 becomes smaller than the fluid pressure at the outlet 3 and the biasing force of the coil spring 8, the disc-like valve body 7 is displaced toward the inlet 1 and is seated on the annular valve seat 6. Prevent backflow of fluid.

The present invention can be applied to a check valve which is attached to a pipe and allows a flow in one direction of the fluid but stops the flow in the opposite direction.

1 Inlet 2 Inlet side member 3 Outlet 4 Outlet side member 5 Valve chamber 6 Annular valve seat 7 Disc valve body 8 Guide hole 9 Guide member 10 Rib 11 Guide rod 13 Coil spring 15 Outlet end inner periphery 16 of guide hole Inlet outer periphery

Claims (1)

Forming an inlet and an outlet in the valve casing, and forming a valve chamber between the inlet and the outlet ;
An annular valve seat disposed between the valve chamber and the inlet,
Place a disc shaped valve body for opening and closing the annular valve seat in the valve chamber on the outlet side of the annular valve seat,
Setting a coil spring which biases the disc-shaped valve body to said annular valve seat,
A guide hole is formed on the outlet side surface of the disc-shaped valve body,
A guide rod with which the inner periphery of the guide hole is in sliding contact is formed on the valve casing on the outlet side of the disc-shaped valve body ,
Performing R processing in the peripheral outlet end of the guide hole,
Performing R processing to the inlet side end periphery of the guide rod,
A check valve and parts in which the disc-shaped valve body is subjected to R processing of the guide said the portion subjected to R processing hole guide rods position seated on the annular valve seat, characterized in that the fitting.

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