JP2571958Y2 - Swing check valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a swing type non-return valve provided with a valve box having an inlet and an outlet, the valve box being provided with a valve element which can be turned to the outlet by a valve rod. About the valve.

[0002]

2. Description of the Related Art A valve element 20 of a conventional swing type check valve shown in FIG. 4 is made of cast iron unless a handling liquid is special, and is rotatably supported on a valve element 1 by a valve rod 6. In general, a rubber sheet 21 abutting on the valve seat 2 is attached to the valve seat surface 20 by a rubber sheet pressing plate 22 and bolts 23. Therefore, the valve body 20 made of cast iron is troublesome because casting is troublesome. In addition, when the valve is closed, the rubber sheet 21 may be turned upside down due to the backflow, and may be caught between the valve seat 2 and damaged. Further, when the valve body 20 is opened and rotated by the water flow, the valve body 20 may be rotated. There is a drawback that the collision sound when the projection 20a on the rear surface of the above is locked to the valve box 1 to form the opening angle θ is large.

The check valve described in Japanese Patent Application Laid-Open No. 52-32130 is provided with a diaphragm at a valve opening position and a valve closing position of a valve body in order to reduce an impact force at the time of opening and closing. Are disclosed.
However, in this known technique, the entire device is complicated by piping and the like, and the hinge portion is a rubber mold, so that the valve body tends to move in the closing direction due to the elasticity of rubber, so that the valve body moves in the closing direction due to the elasticity of rubber. As a result, the pressure loss is large, and the valve body is engaged with the valve box when the valve is opened, so that no fluid force acts on the back surface of the valve body, and the valve closing operation is delayed. Further, Japanese Unexamined Utility Model Publication No. 3-35378 discloses a technique in which a stopper that engages with a valve element when the valve is opened is provided on the casing and the valve element. However,
In such a known technique, the damage due to the impact is large, and therefore, the wing gives a cushioning force, and the impact sound cannot be eliminated anyway.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a swing check valve which has a simple structure, operates smoothly on and off valves, and can sufficiently reduce collision noise.

[0005]

According to the present invention, a valve seat (2) is formed in a valve box (1) having an inlet (3) and an outlet (5), and the valve seat (2). Disc (10) to sit on
In the swing type check valve, which is rotatably provided on the outlet (5) side by a valve rod (6) provided in the valve box (1), the main body (11) of the valve body (10) is made of a steel plate. A circular portion (12) and a hinge portion (15) for winding the valve stem (6) are press-formed, and a curved portion (12a) is formed at the center of the circular portion (12); On the valve seat (2) side of the circular portion (12), a valve seat plate (14) is provided with the curved portion (12).
Except for a), it is integrally attached by a rubber mold, and a projection (13) is integrally formed by a rubber mold at a curved portion (12a) on a side facing the valve seat plate (14).

[0006]

Therefore, the valve body stops when the projection is engaged with the valve box when the valve is opened, but the impact force is absorbed because it is formed integrally with the rubber mold. In addition, a fluid force acts on the rear surface of the valve body due to the projection, and the valve closing operation is smoothly performed.

Further, since the hinge portion is press-formed, the friction between the hinge portion and the valve stem is small, and a smooth opening / closing operation can be performed. Further, since the valve seat plate is formed integrally with the valve body by rubber molding, the valve seat plate does not bite between the valve seat due to bending or bending.

As described above, according to the present invention, it is possible to obtain a swing type check valve which is lightweight, has a small impact sound, and operates smoothly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a valve seat 2 is formed in a valve box 1, and a portion between the inlet 3 and the valve seat 2 is communicated with a bypass valve mounting portion 4. A valve body indicated by reference numeral 10 that is entirely seated on the valve seat 2 is rotatably provided on the outlet 5 side by a valve rod 6 fixed to the valve box 1.

Referring also to FIGS. 2 and 3, the main body 11 of the valve body 10 is made of a steel plate, and a circular portion 12 and a hinge portion 15 around which the valve rod 6 is wound are press-formed. At the center of the circular portion 12, a curved portion 12a is formed.
A valve seat plate 14 is integrally attached to the second valve seat 2 side by a rubber mold except for a curved portion 12a. At the curved portion 12a on the side facing the valve seat plate 14, a projection, that is, a stopper 13 is integrally formed by a rubber mold.

Therefore, when the valve is closed, the valve seat plate 14 integrally attached to the valve seat is prevented from being turned upside down and bitten between the valve seat 2 by backflow. In addition, valve body 1
When the stopper 13 is locked to the valve box 1 to form an appropriate opening angle θ as shown by a chain line in FIG. 1, the collision sound between the stopper 13 and the valve box 1 is extremely low. It is reduced. Further, the impact at the time of closing the valve is absorbed by the valve seat plate 14, and the pressure is absorbed by the curved portion 12a, so that the strength can be increased.

[0013]

[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be obtained. (A) When the valve is closed, the fluid can flow around the back surface of the valve body by the projection, and the valve closing action is smoothly performed by the fluid force. (B) Since the hinge portion is made of a steel plate, there is little rotational friction with the valve stem and there is little pressure loss. (C) Since the valve seat plate is integrated with the valve body with a rubber mold, it does not bite between the valve seat and the valve seat due to turning over or the like. (D) It is possible to obtain a swing type check valve which is lightweight because it is made of a steel plate, has a small impact sound, and operates smoothly.

The valve seat plate is formed integrally with the valve body by a rubber mold, so that the valve seat plate can be prevented from being damaged by being bent and bent.

The stopper is molded with a rubber mold, so that the collision sound at the time of opening the valve body can be extremely reduced.

The valve body is press-formed with a steel plate to facilitate working and assembling, and to reduce the pressure loss head.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a top view of a valve body.

FIG. 3 is a side sectional view of a valve body.

FIG. 4 is a side sectional view of a conventional swing check valve.

[Explanation of symbols]

 θ Opening angle 1 Valve box 2 Valve seat 3 Inflow port 4 Bypass valve mounting part 5 Outflow port 6 Valve stem 10 Valve body DESCRIPTION OF SYMBOLS 11 ... Main body 12 ... Circular part 13 ... Stopper 14 ... Valve seat plate 15 ... Hinge part 20 ... Valve element 21 ... Rubber sheet 22 ... Rubber sheet pressing plate 23 ···bolt

Continuing from the front page (72) Inventor Yoshiyuki Kitajima 873 Kuji, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside Kumagaya Ironworks Co., Ltd. JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 15/00-15/20

Claims (1)

(57) [Scope of request for utility model registration] A valve seat (2) is formed in a valve box (1) having an inlet (3) and an outlet (5), and a valve body (10) seated on the valve seat (2) is a valve. In a swing type check valve rotatably provided on an outlet (5) side by a valve rod (6) provided in a box (1), a main body (11) of a valve body (10) is made of a steel plate. A circular portion (12) and a hinge portion (15) around which the valve stem (6) is wound are press-formed, a curved portion (12a) is formed at the center of the circular portion (12), and the circular shape is formed. On the valve seat (2) side of the portion (12), a valve seat plate (14) is integrally attached with a rubber mold except for the curved portion (12a), and the curved portion on the side facing the valve seat plate (14). A swing check valve characterized in that a projection (13) is integrally formed by a rubber mold at a portion (12a).