JP2544578B2 - Spring self-closing check valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a valve body in a valve box so as to be rotatable around a valve rod, and the valve body is biased by a spring to rotate in a closing direction. In particular, the present invention relates to a self-closing check valve with a built-in spring whose main body is made of stainless steel.

[0002]

2. Description of the Related Art A check valve is always used in a pipeline of a pump facility for pumping water to a high place, and a check valve is usually attached to the discharge of the pump. In a check valve in which the valve element is biased in the closing direction by the action of gravity, there is no restriction on the vertical mounting of the check valve, and on the other hand, a self-closing check valve that incorporates a spring that forces the valve element in the closing direction. Has already been proposed.
The spring is wound around the valve rod which is the center of rotation of the valve body.

The self-closing check valve described above has a feature that it is not directional in its mounting position and can be mounted horizontally, vertically, or in any direction. In the conventional self-closing check valve, as described above, the spring is wound around the valve rod, so the force acting on the valve body of the spring is not sufficient, and therefore the valve body cannot be quickly opened and closed. . In addition, the biasing force of the spring and the passing water pressure are in equilibrium, sometimes causing the valve element to float in the open position.
As a result, it is not guaranteed to prevent the occurrence of a water hammer when the pump is stopped.

In order to solve such a problem, a spring is movably mounted on a spring guide rod, and the spring guide rod is attached to a bearing guide fixed to the inner surface of the valve box.
A spring-equipped self-closing check valve is proposed, which is supported downstream of the valve rod and parallel to the valve rod, and one end of the spring is slidably supported on the bearing guide and the other end is slidably supported on the valve body. ing.

In this check valve, the urging force in the closing direction acting on the valve body from the spring becomes strong, and as a result, the valve body is promptly opened and closed, and therefore the generation of water hammer is guaranteed.

By the way, in the above-mentioned check valve, when the spring part is clogged with an object, the spring can be easily removed for maintenance, and the valve box can withstand a large water pressure, and the pipe can be attached. It is required to have rigidity against external force from.

[0007]

However, the conventional check valve has a drawback in that the spring or the like cannot be removed and disassembled, and good maintenance cannot be performed. Further, it is conceivable to increase the thickness of the stainless steel material in order to obtain the strength capable of withstanding water pressure and the rigidity with respect to the external force from the pipe mounting in the conventional check valve manufactured by pressing the stainless steel material. However, there was a problem that the material cost increased.

An object of the present invention is to eliminate the above-mentioned disadvantages of the conventional spring-equipped self-closing check valve.

[0009]

According to the present invention, the spring guide rod is supported by holes provided in the hanging parts at both ends of the bearing guide, and these holes have a radius smaller than that of the inner edge of the hanging part. It is proposed to be formed to bend at an acute angle outward and then downstream in the direction of fluid flow.

Further, in order to solve the above-mentioned problems, the present invention has a double structure in which the valve box is composed of an inner valve box and an outer valve box, and the inner valve box outer surface diameter difference portion and the outer valve box inner surface are formed. It is proposed that an O-ring be arranged between the reduced diameter portion and that a plurality of axial ribs for rigidity reinforcement be attached to the outer peripheral surface of the outer valve box.

[0011]

In the present invention, the spring guide rod is supported by the holes provided in the hanging parts at both ends of the bearing guide, and these holes are radially outward from the inner edge of the hanging parts and then in the flow direction of the fluid. Since the spring guide rod is formed to bend at an acute angle downstream, the spring guide rod can be attached and detached by an external force, and is maintained in a fixed holding state with respect to water passage and closing operation of the valve body.

Further, according to the present invention, the valve box has a double structure consisting of an inner valve box and an outer valve box, and an O-ring is arranged between the outer surface inner diameter difference portion of the inner valve housing and the outer surface inner diameter difference portion of the outer valve housing. Further, since a plurality of axial ribs for reinforcing rigidity are attached to the outer peripheral surface of the outer valve box, the strength and rigidity of the valve box can be increased without increasing the thickness of the material.

[0013]

1 and 2, a valve box 1 is an outer valve box 1
a and the inner valve housing 1b, and the bearing guide 2 is fixedly mounted in the inner valve housing 1b. This bearing guide 2
A valve rod 3 is rotatably attached to each of the hanging portions 2a and 2b on both sides of the bearing by a bearing 4. A valve body 5 is fixed to the valve rod 3, and a rubber plate 6 and a valve body arm 12 are integrally fixed to the valve body 5 by a rubber plate retainer 7, bolts 8a and nuts 8b. Reference numeral 9 is a partition plate.

The hanging parts 2a, 2 on both sides of the bearing guide 2
At b, a spring guide rod 10 is attached in parallel to the valve rod 3 downstream of the valve rod 3 in the direction of fluid flow and at a distance from the valve rod 3. A spring 11 is movably wound around and attached to the spring guide rod 10, and one end of the spring 11 has the bearing guide 2
, And the other end is slidably attached to a valve body arm 12 fixed to the valve body 5. The valve body 5 is constantly urged in the direction of closing the valve opening by the spring 11 attached as described above.

The outer valve casing 1a and the inner valve casing 1b are fixed inside and outside the downstream ring portion 13a of the retaining ring 13, and the upstream ring portion 13b of the retaining ring 13 abuts and supports the partition plate 9. Then enter. As shown in FIG. 2, the outer valve box 1a and the inner valve box 1
An O-ring 14 is provided between the inner valve box 1b and the inner valve box 1b, and an O-ring 15 is provided between the inner valve box 1b, the partition plate 9 and the tubular portion 13c of the retaining ring 13, thereby sealing the internal pressure of the valve box.

In FIG. 3, the spring guide rod 10 is supported in elongated holes 16 provided in both hanging parts 2a and 2b of the bearing guide 2. This long hole 16 has the hanging parts 2a, 2b.
3 is bent radially outward from the inner edge of the spring, and then downstream in the direction of fluid flow at an acute angle θ. As shown in FIG. Is attached to the part. By attaching the spring guide rod 10 in this way, the spring 11 and the spring guide rod 10 can be attached and detached by an external force, but they are in a fixed holding state with respect to water passage and closing operation of the valve body. Maintained.

A plurality of ribs 17 are fixedly provided on the outer peripheral surface of the outer valve casing 1a of the valve casing 1, so that rigidity is obtained against an external force from pipe mounting.

[0018]

According to the structure of claim 1, the spring guide rod can be attached and detached by an external force, so that the spring portion can be easily disassembled, and the inspection and cleaning of the portion can be facilitated.

According to the second aspect of the present invention, since the valve box has a double structure and a plurality of axial ribs for reinforcing rigidity are attached to the outer peripheral surface of the outer valve box, the material thickness is not increased. In addition, the strength and rigidity of the valve box can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 of an embodiment of a self-closing check valve with a spring according to the present invention.

FIG. 2 is a vertical cross-sectional view of the spring-equipped self-closing check valve.

FIG. 3 is an explanatory diagram of attachment of a spring guide rod.

[Explanation of symbols]

 1 valve box 1a outer valve box 1b inner valve box 2 bearing guide 3 valve rod 5 valve disc 10 spring guide rod 11 spring 12 valve disc arm 14, 15 O-ring 16 long hole 17 rib

Claims (2)

(57) [Claims] 1. A valve body is rotatably mounted in a valve box about a valve rod, and the valve body is biased by a spring so as to rotate in a closing direction. The spring guide rod. Movably attached to this spring guide rod,
A bearing guide fixed to the inner surface of the valve box is supported at a downstream position apart from the valve rod and parallel to the valve rod, and one end of the spring slides on the bearing guide and the other end slides on the valve body. In a self-closing check valve with a spring inside which is rotatably supported, the spring guide rods are supported by elongated holes provided in the hanging parts at both ends of the bearing guide, and these elongated holes are radially arranged from the inner edge of the hanging part. A self-closing check valve with a built-in spring, which is formed so as to be bent outward at an acute angle in the flow direction of the fluid. 2. The valve box has a double structure consisting of an inner valve box and an outer valve box, and an O-ring is arranged between the outer surface of the inner valve box and the outer surface of the outer valve box. The self-closing check valve with a built-in spring according to claim 1, wherein a plurality of axial ribs for reinforcing rigidity are attached to the outer peripheral surface of the outer valve box.