JP5643586B2 - Check valve - Google Patents

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 with a coil spring that biases the annular valve seat, a protrusion on the outer periphery of the disc-shaped valve body, and a sliding contact cylindrical surface on which the outer surface of the protrusion on the outer periphery of the disk-shaped valve body slides. 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. The guide rod is formed on the outlet side of the disc-shaped valve body, and the outer periphery of the guide rod is slidably contacted with the disc-shaped valve disc disposed in the valve chamber and provided with a coil spring for biasing the disc-shaped valve disc to the annular valve seat. A guide hole is formed in the valve casing, R processing is performed on the outer periphery of the outlet end of the guide rod, R processing is performed on the inner periphery of the inlet end of the guide hole, and the guide is guided at the position where the disc-shaped valve body is seated on the annular valve seat. The portion of the rod subjected to R processing is fitted to the portion of the guide hole subjected to R processing.

According to the present invention, the guide rod is formed on the outlet side surface of the disc-shaped valve body, the guide hole in which the outer periphery of the guide rod is slidably contacted is formed in the valve casing, the outer periphery of the guide rod on the outlet side end is subjected to R machining, R processing is performed on the inner periphery of the inlet side end of the hole, and the portion of the guide rod subjected to R processing and the portion of the guide hole subjected to R processing are fitted at the position where the disc-like valve body is seated on the annular valve seat. Therefore, the disc-shaped valve body can be tilted in all directions at the position where it abuts against the valve seat member, and even when the disc-shaped valve body is tilted when seated on the annular valve seat, 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 rod 8 is formed at 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 is formed by forming a guide ring having a guide hole 11 formed on the central axis of the inlet 1 and the outlet 3 through four ribs 10. The guide member 9 guides the disc-shaped valve element 7 on the inner periphery of the guide hole 11. The outer periphery of the rod 8 is in sliding contact. The outer diameter of the guide bar 8 is made slightly smaller than the inner diameter of the guide hole 11 so as to come into sliding contact with the guide hole 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 outer periphery 15 on the outlet 3 side end of the guide rod 8 of the disc-shaped valve element 7. R machining is performed on the inner periphery 16 of the guide hole 11 of the guide member 9 on the inlet 1 side end. At the position where the disc-like valve body 7 is seated on the annular valve seat 6, the portion 15 where the guide rod 8 has been subjected to the R processing and the portion 16 where the guide hole 11 has been subjected to the R processing 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.

DESCRIPTION OF SYMBOLS 1 Inlet 2 Inlet side member 3 Outlet 4 Outlet side member 5 Valve chamber 6 Annular valve seat 7 Disc-shaped valve body 8 Guide rod 9 Guide member 10 Rib 11 Guide hole 13 Coil spring 15 Outlet end inner periphery 16 of guide rod 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,
The guide rod is formed on the outlet side of the disc-shaped valve body,
A guide hole with which the outer periphery of the guide rod comes into sliding contact is formed in the valve casing on the outlet side of the disc-shaped valve body ,
Performing R processing on the outlet side end periphery of the guide rod,
Performing R processing in the peripheral inlet end of the guide hole,
A check valve and parts in which the disc-shaped valve body is subjected to R processing of the a portion subjected to R processing guide hole of the guide rod at a position seated on the annular valve seat, characterized in that the fitting.

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