JP2011106527A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve which prevents the side end of a spring holder of a coil spring from being displaced to the output face side of the spring end and from being wound around the spring holder. <P>SOLUTION: A valve casing 1 forms an inlet 2, a valve chamber 3 and an outlet 4. An annular valve seat 5 is provided between the inlet 2 and valve chamber 3. A valve body 6 for opening and closing the annular valve seat 5 is disposed in the valve chamber 3. An outlet side valve rod 8 is provided protrusively on the outlet face of the valve body 6. A coil spring 19 for biasing the valve body 6 to the annular valve seat 5 is provided between a spring holder 18 extending straightly in the vertical direction and the valve body 6. In this check valve, a small diameter part 23, which contacts loosely and slidably the outside circumference of the outlet side valve rod 8, is formed at the side end of the spring holder of the coil spring 19 located at the inlet face side of the spring holder 18. The end of the small diameter part 23 of the coil spring 19 can be positioned at the inside of the width of the spring holder 18 even if a shock by fall is received, so that the side end of the spring holder 18 of the coil spring 19 can be prevented from being displaced to the output face side of the spring holder 18 and from being wound around the spring holder 18. <P>COPYRIGHT: (C)2011,JPO&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 provided with a coil spring for urging the body toward 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 valve body that opens and closes the annular valve seat is disposed in the valve chamber. An outlet side valve rod is provided in a projecting manner, and a coil spring for biasing the valve element toward the annular valve seat is provided between a spring receiver and a valve element extending in a vertical direction. When the inlet fluid pressure becomes larger than the outlet fluid pressure and the biasing force of the coil spring, the valve body compresses the coil spring and moves away from the annular valve seat, and the inlet fluid flows to the outlet through the outer periphery of the valve body. 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 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.

JP 2004-108409 A

When the above conventional check valve is accidentally dropped before being attached to the fluid piping and is subjected to an impact, the spring receiving side end of the coil spring located on the inlet surface side of the spring receiver is the outlet surface side of the spring receiver There was a problem that it was displaced to wind around the spring receiver.

Therefore, the problem to be solved by the present invention is to provide a check valve capable of preventing the spring receiving side end of the coil spring from being displaced toward the outlet face side of the spring receiving and being wound around the spring receiving.

In order to solve the above-described problems, the check valve of the present invention forms an inlet, a valve chamber, and an outlet in a valve casing, and provides an annular valve seat between the inlet and the valve chamber. A valve body that opens and closes is arranged, an outlet-side valve stem projects from the outlet face of the valve body, and a coil spring that biases the valve body to the annular valve seat is provided between the spring receiver that extends in a vertical direction and the valve body In this case, a small-diameter portion that is loosely slidably contacted with the outlet side valve stem is formed at the spring receiving side end of the coil spring located on the inlet surface side of the spring receiver.

According to the present invention, the small diameter portion of the coil spring is formed even if it is subjected to an impact due to dropping or the like by forming a small diameter portion loosely slidably contacting the outlet side valve stem at the spring receiving side end of the coil spring located on the inlet face side of the spring receiver. The end of the portion can be positioned inside the width of the spring receiver, and it is possible to prevent the spring receiver side end of the coil spring from being displaced toward the outlet face side of the spring receiver and being wound around the spring receiver.

It is sectional drawing which shows the valve closing state of the non-return valve concerning embodiment of this invention. It is sectional drawing which shows the valve opening state of the non-return valve concerning embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. The valve casing 1 of this embodiment is disposed between an inlet side piping flange and an outlet side piping flange (not shown) and is sandwiched by fastening means including bolts and nuts. An inlet 2, a valve chamber 3 having a diameter larger than that of the inlet 2, and an outlet 4 are formed in the valve casing 1, and an annular valve seat 5 is provided between the inlet 2 and the valve chamber 3. The inlet 2, the valve chamber 3, the outlet 4, and the annular valve seat 5 are formed on the same axis.

A valve body 6 for opening and closing the annular valve seat 5 is disposed on the outlet 4 side of the annular valve seat 5. The valve body 6 integrally has a valve rod 7 provided so as to protrude from the inlet surface and an outlet side valve rod 8 provided so as to protrude from the outlet surface. Two ribs 9 and 10 projecting from the inner wall of the inlet 2 into the valve chamber 3 are formed integrally with the valve casing 1. A guide member 12 having a guide hole 11 on which the outer periphery of the valve stem 7 slides is integrally formed at the inner ends of the ribs 9 and 10. The guide hole 11 of the guide member 12 is formed coaxially with the inlet 2. The inner end sides of the ribs 9 and 10 and the guide member 12 are located in the valve chamber 3. The center of the valve body 6 is curved toward the outlet 4 side to form a recess 20 that accommodates the ribs 9 and 10 protruding toward the valve chamber 3 and the guide member 12 when the valve is closed.

Two ribs 13 and 14 are formed integrally with the valve casing 1 on the inner wall of the valve chamber 3. Both ends of a spring receiver 18 having guide holes 17 on which the outer periphery of the outlet side valve stem 8 slides are fitted into grooves 15 and 16 formed in the ribs 13 and 14, and the spring receiver 18 is attached to the valve casing 1. The guide hole 17 of the spring receiver 18 is formed coaxially with the inlet 2. The spring receiver 18 extends in a single letter in the vertical direction, and a coil spring 19 that biases the valve body 6 toward the annular valve seat 5 is provided between the spring receiver 18 and the valve body 6. The spring receiver 18 has an upper protruding portion 21 and a lower protruding portion 22 that are bent upward and downward and protruded toward the valve body 6, and the upper end of the upper protruding portion 21 and the lower end of the lower protruding portion 22 are the rib 13 side and the rib. The shape is bent to the 14th side. The upper protrusion 21 and the lower protrusion 22 hold the upper and lower portions of the outer periphery of the coil spring 19 loosely. A small-diameter portion 23 that loosely slides on the outer periphery of the outlet-side valve stem 8 is formed at the end of the coil spring 19 located on the inlet face side of the spring receiver 18 on the spring receiver 18 side. Even when subjected to an impact due to dropping or the like, the end of the small diameter portion 23 of the coil spring 19 can be positioned inside the width of the spring receiver 18, and the end of the coil spring 19 on the side of the spring receiver 18 is displaced toward the exit surface of the spring receiver 18. Thus, it is possible to prevent the spring receiver 18 from being wound around.

When the fluid pressure at the inlet 2 becomes higher than that at the outlet 4, the valve body 6 is displaced toward the outlet 4 against the urging force of the coil spring 19, and the fluid at the inlet 4 flows from the periphery of the ribs 9, 10 and the guide member 12. It flows to the outlet 4 through the periphery of the valve body 6. Since the inner end side of the ribs 9 and 10 and the guide member 12 are located in the valve chamber 3 having a larger diameter than the inlet 2, the fluid passage area around the ribs 9 and 10 and the guide member 12 is large, and the flow rate is increased. . When the fluid pressure at the outlet 4 becomes higher than that at the inlet 2, the valve body 6 receives the fluid pressure and the action of the coil spring 19 and is displaced to the inlet 2 side to contact the annular valve seat 5 secretly, thereby preventing backflow. .

The present invention is provided with a coil spring that urges the valve body toward the annular valve seat, and allows the fluid to flow in the forward direction from the inlet to the outlet, but can be used as a check valve that blocks the reverse flow. it can.

DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inlet 3 Valve chamber 4 Outlet 5 Annular valve seat 6 Valve body 8 Outlet side valve rod 18 Spring receiver 19 Coil spring 21 Upper protrusion 22 Lower protrusion 23 Small diameter part

Claims (1)

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 valve body that opens and closes the annular valve seat is disposed in the valve chamber. A coil spring spring receiver located on the inlet face side of the spring holder, in which a rod is protruded and a coil spring for urging the valve element to the annular valve seat is provided between the spring holder and the valve element extending vertically. A check valve characterized in that a small-diameter portion that is loosely slidably contacted with an outlet side valve stem is formed at a side end.

Images