JP2003028324A - Spring-loaded disk type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a disk-like valve element from coming into contact with an annular valve seat in such a state of having foreign matter caught between the inner surface of a rib and the outer peripheral surface of the disk-like valve element. SOLUTION: An inlet 2, the annular valve seat 3, and an outlet 4 are formed in a valve easing 1. The disk-like valve element 6 is disposed on the outlet 4 side of the annular valve seat 3, and a coiled spring 8 for energizing the disk-like valve element 3 against the annular valve seat 3 is installed. Four ribs 5 are provided for guiding the disk-like valve element 6 in the axial direction of the annular valve seat 3 while allowing the outer peripheral surface of the disk-like valve element 6 to come into contact with the inner peripheral wall of the valve easing 1. All internal surfaces of the ribs 5 are formed to be concentrically positioned equally apart from the axis of the annular valve seat 3. Five grooves 10 smaller in width than the thickness of the disk-like valve element 6 and opened aslant relative to the axial direction of the annular valve seat 3 are formed in the internal surfaces of the ribs 5.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is attached to 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 a spring-biased disc check valve in which a disc-shaped valve body is urged to a valve seat by a spring. In the spring-biased disc type 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 space for fluid passage is provided between the outer periphery of the disc-shaped valve body and the inner peripheral wall of the valve casing. Must be formed. 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. In this method, an inlet and an outlet are provided in a valve casing, an annular valve seat is provided between the inlet and the outlet, and a disc-shaped valve body is arranged on the outlet side of the annular valve seat, and the disc-shaped valve body is urged to the annular valve seat. To provide a spring
A rib for guiding the disc-shaped valve body in the axial direction of the annular valve seat by sliding the outer periphery of the disc-shaped valve body on the inner peripheral wall of the valve casing. [0003] In the above-mentioned prior art spring-loaded disk type check valve, when foreign matter such as dirt and scale mixed in the fluid adheres to the inner surface of the rib, the inner surface of the rib is disturbed. There is a problem that the disk-shaped valve body contacts the annular valve seat in a state where foreign matter is caught between the disk-shaped valve body and the outer periphery of the disk-shaped valve body, so that the disk-shaped valve body cannot be in close contact with the annular valve seat. Accordingly, a technical object of the present invention is to provide a spring-loaded device in which a disc-shaped valve body does not come into contact with an annular valve seat in a state where foreign matter is caught between an inner surface of a rib and an outer periphery of the disc-shaped valve body. It is to provide a disk-type check valve. [0005] In order to solve the above-mentioned technical problems, the technical means of the present invention is to provide an inlet and an outlet in a valve casing, and to provide 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 brought into sliding contact with the inner peripheral wall of the valve casing. The rib provided for guiding the disc-shaped valve body in the axial direction of the annular valve seat has a width smaller than the thickness of the disc-shaped valve body and formed obliquely in the axial direction of the annular valve seat. A spring-loaded disk check valve characterized by being provided on an inner surface. DETAILED DESCRIPTION OF THE INVENTION In the present invention, a groove having a width smaller than the thickness of a disk-shaped valve body and formed obliquely with respect to the axial direction of an annular valve seat is provided on the inner surface of a rib. Therefore, even if foreign matter is caught between the inner surface of the rib and the outer periphery of the disc-shaped valve body, the foreign matter hits the corner of the groove and falls into the groove in the process of displacing the disk-shaped valve body to a position in contact with the annular valve seat. Therefore, the disc-shaped valve body does not come into contact with the annular valve seat in a state where foreign matter is caught between the inner surface of the rib and the outer periphery of the disc-shaped valve body. Next, an embodiment showing a specific example of the technical means of the present invention will be described with reference to FIG. In FIG. 1, a valve casing 1 of the present 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, an annular valve seat 3, and an outlet 4 are formed coaxially in a valve casing 1. The disk-shaped valve element 6 is brought into sliding contact with the inner peripheral wall of the valve casing 1 by sliding the outer periphery of the disk-shaped valve element 6.
Are provided with four ribs 5 for guiding in the axial direction. The inner surfaces of the ribs 5 are all located on concentric circles and are formed equidistant from the axis of the annular valve seat 3. On the inner surface of the rib 5, five grooves 10 having a width smaller than the thickness of the disk-shaped valve body 6 and formed obliquely with respect to the axial direction of the annular valve seat 3 are formed. At the outlet 4 side of the annular valve seat 3, a disc-shaped valve body 6 is provided.
Place. 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 slides loosely on the inner surface of the rib 5. The outer periphery of the spring receiver 7 is fitted and fixed to the rib 5.
The disc-shaped valve element 6 is disposed between the disc-shaped valve element 6 and the spring receiver 7.
A coil spring 8 for urging the annular valve seat 3 is disposed. The spring receiver 7 has a fluid passage hole 9 at the center, and the
Side, and the outer peripheral side is further curved toward the inner peripheral wall side of the valve casing 1. 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. On the inner surface of the rib 5, five grooves 10 which are smaller in width than the thickness of the disc-shaped valve body 6 and are formed obliquely with respect to the axial direction of the annular valve seat 3 are formed.
Even if foreign matter is caught between the inner surface of the disk-shaped valve body 6 and the outer periphery of the disk-shaped valve body 6, the foreign matter hits the corner of the groove 10 and falls into the groove 10 while the disk-shaped valve body 6 is displaced toward the outlet 4. When the fluid pressure at the outlet 4 becomes higher than that at the inlet 2, the disc-shaped valve 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. Even if foreign matter is caught between the inner surface of the rib 5 and the outer periphery of the disc-shaped valve body 6, the foreign matter hits the corner of the groove 10 in the process of displacing the disc-shaped valve body 6 to a position where it comes into contact with the annular valve seat 3 and enters the groove 10. drop down. Therefore, the disc-shaped valve body 6 does not come into contact with the annular valve seat 3 in a state where foreign matter is caught between the inner surface of the rib 5 and the outer periphery of the disc-shaped valve body 6. As described above, according to the present invention, a groove having a width smaller than the thickness of the disk-shaped valve body and formed obliquely with respect to the axial direction of the annular valve seat is formed on the inner surface of the rib. By
Foreign matter that has caught between the inner surface of the rib and the outer periphery of the disc-shaped valve body falls into the groove at the corner of the groove while the disc-shaped valve body is displaced to a position in contact with the annular valve seat. An excellent effect is obtained in that the disc-shaped valve body does not come into contact with the annular valve seat in a state where foreign matter is caught between the valve body and the outer periphery of the valve body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of a spring-biased disk check valve according to the present invention. [Description of Signs] 1 Valve casing 2 Inlet 3 Annular valve seat 4 Outlet 5 Rib 6 Disc-shaped valve element 7 Spring receiver 8 Coil spring 10 Groove

Claims (1)

Claims 1. An inlet and an outlet are provided in a valve casing, an annular valve seat is provided between the inlet and the outlet, and a disk-shaped valve body is disposed on an outlet side of the annular valve seat. A spring provided to bias the body against the annular valve seat, and a rib for sliding the outer periphery of the disc-shaped valve body against the inner peripheral wall of the valve casing to guide the disc-shaped valve body in the axial direction of the annular valve seat. A spring-biased disk-type check valve, characterized in that a groove having a width smaller than the thickness of the disk-shaped valve body and formed obliquely with respect to the axial direction of the annular valve seat is provided on the inner surface of the rib.