JPH0926045A - Rubber lining structure of check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct the repair of rubber lining without waste in the case of a check valve where a valve body to carry out opening/closing swing with a rotary support axis as a swing center is arranged in a valve box and valve seats with which the valve body in a totally closed position comes into pressing contact are formed on the inner periphery surface and rubber lining is administered on the inner periphery surface of the valve box and the outer periphery surface of the valve body. SOLUTION: The rubber lining 19 of a valve body 13 is formed on valve seat 14 sides so that the larger the distance from a rotary support axis may become, the thicker it may become. As a result, the breakage of the rubber lining 19 becomes almost equal regardless of the distance from the rotary support axis 17, so waste at the time of repair can be reduced. Also, the mechanical processing of the valve box valve seats 14 becomes easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber lining structure for a check valve having a valve body which is used for a flow path of fluid such as liquid, air and gas and which is opened and closed by the fluid.

[0002]

2. Description of the Related Art As a conventional check valve, there is one as shown in FIG. Inside the valve box 1, a valve body 3 that is oscillated between a position where the internal flow path 2 is opened (a position shown by an imaginary line) and a position where the internal flow path 2 is fully closed is arranged, and a valve body 3 is provided on an inner peripheral surface of the valve box 1. A valve seat 4 is in contact with the body 3 in the fully closed position, and a valve body stopper 5 is in contact with the valve body 3 in the fully open position.

The valve body 3 is fixed to the tip of a swing arm 6 by a bolt, and the swing arm 6 is swingably held by a rotary support shaft 7 in the valve box 1 at the base end side.
Rubber linings 8 and 9 are provided on the inner peripheral surface of the valve housing 1 including the valve seat 4 and the valve body stopper 5 and the outer peripheral surface of the valve body 3, respectively.

In the check valve having such a structure, the valve box 1
When the fluid flows through the internal flow path 2 in the positive direction, the flowing fluid collides with the valve body 3 and pushes up the valve body 3, and the valve body 3 swings around the axis of the rotation support shaft 7 in the opening direction. To open the internal flow path 2. The valve body 3 abuts the valve body stopper 5 in the fully opened position.

On the other hand, when the fluid flows backward, the valve body 3 oscillates in the closing direction by its own weight, and the flowing fluid presses the valve body 3 in the closing direction, whereby the valve body 3 is closed. The internal flow path 2 is fully closed by being pressed against the seat 4.

[0006]

SUMMARY OF THE INVENTION In a conventional check valve, for the purpose of protecting the valve box 1 and the valve body 3 and improving the airtightness between the valve box valve seat 4 and the valve body 3, As described above, the rubber linings 8 and 9 are provided on the inner peripheral surface of the valve box 1 and the outer peripheral surface of the valve body 3, respectively. When the valve body 3 swings in the closing direction, the valve body 3 and the valve seat 4 are Collide violently with the rubber lining 8 during long-term use of the check valve.
Is damaged and the damaged rubber lining 8 needs to be replaced. However, as can be seen from FIG.
Since there is a difference in the speed of the valve body 3 depending on the distance from,
That is, since the portion farther from the rotary support shaft 7 has a higher speed, the rubber lining 8 near the rotary support shaft 7 may be usable even if the rubber lining 8 farther from the rotary support shaft 7 is damaged.

Further, in the above check valve,
In order to reduce the impact that the valve body 3 receives from the fluid flowing through the internal flow passage 2, the valve body 3 is arranged so as to be inclined with respect to the internal flow passage 2, and for this reason, the valve seat of the valve box is arranged. 4 is also formed so as to be inclined with respect to the axis of the valve box straight pipe portion 10 that directs the internal flow path 2. Therefore, it may be difficult to machine the valve seat 4.

The present invention is intended to solve the above problems, and it is an object of the present invention to easily machine a valve box valve seat and to repair a rubber lining without waste.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention sways in a valve box between a position where an internal flow path is opened and a position where the internal flow path is fully closed with a rotary support shaft as a swing center. A valve body is movably arranged, and a valve seat is formed on the inner peripheral surface of the valve body, which is in pressure contact with the valve body at the fully closed position, and the inner peripheral surface of the valve body including the valve seat and the outer peripheral surface of the valve body. A rubber lining structure for a check valve having a rubber lining, wherein the rubber lining for the check valve is formed thicker on the valve seat side as the distance from the rotation shaft increases.

According to the above construction, the rubber lining is formed thicker in the portion where the distance from the rotary support shaft is larger and the speed of the valve body is higher, so that the rubber lining caused by the collision between the valve body and the valve seat is formed. The damage is almost uniform regardless of the distance from the rotation spindle, and there is no inconvenience of replacing the entire rubber lining when only part of the rubber lining is damaged.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a check valve according to the present invention, and this check valve is basically constructed similarly to the conventional one described with reference to FIG.

Inside the valve box 11, there is disposed a valve body 13 which swings between a position where the internal flow passage 12 is opened (a position shown by an imaginary line) and a position where it is fully closed. Further, a valve seat 14 with which the valve body 13 is in pressure contact with the fully closed position and a valve body stopper 15 with which the valve body 13 is in contact with the fully open position are formed.

The valve body 13 is fixed to the tip of a swing arm 16 by a bolt, and the swing arm 16 is swingably held by a rotary support shaft 17 in the valve box 11 at the base end side. Valve box 1 including valve seat 14 and valve stopper 15
Rubber linings 18 and 19 are provided on the inner peripheral surface of 1 and the outer peripheral surface of the valve body 13, respectively.

Here, the check valve of this embodiment is different from the conventional one described with reference to FIG. 2 in that the rubber lining 19 of the valve body 13 is located on the valve seat 14 side in a distance from the rotary support shaft 17. The larger the size, the thicker it is. Another point is that the valve seat 14 of the valve box is formed so that a virtual plane including the contact surface 14a with the valve body 13 is substantially orthogonal to the axial center of the valve box straight pipe portion 20.

The operation of the check valve having such a structure is almost the same as that of the conventional one described with reference to FIG. That is, when the fluid flows through the internal flow path 12 of the valve box 11 in the forward direction, the flowing fluid collides with the valve body 13 and pushes up the valve body 13, and the valve body 13 opens around the axis of the rotation support shaft 17. The internal flow path 12 is opened by swinging in the direction. The valve body 13 abuts the valve body stopper 15 in the fully open position.

When the fluid flows back, the valve body 13 oscillates in the closing direction by its own weight, and the fluid flowing back flows in the valve body 1.
3 in the closing direction, which causes the valve body 13 to move to the valve seat 14
And the inner flow path 12 is fully closed. At this time, the rubber linings 18 and 19 alleviate the impact at the time of the collision between the valve body 13 and the valve seat 14, and the valve body 13 and the valve seat 1
The tightness between 4 and 4 is secured.

However, during long-term use of the check valve,
Although the rubber lining 19 is gradually damaged, the rubber lining 19 is formed thicker on the valve seat 14 side as the distance from the rotary support shaft 17 increases, so that the valve body 13
The damage of the rubber lining 19 due to the collision between the valve seat 14 and the valve seat 14 is substantially uniform regardless of the distance from the rotary support shaft 17. Therefore, there is no waste of replacing the entire rubber lining which is partially damaged as in the conventional case.

As described above, the thickness of the rubber lining 19 is increased as the distance from the rotary support shaft 17 increases, so that the valve lining 13 can be inclined with respect to the internal flow passage 12 by the rubber lining 19. As a result, as described above, the valve seat 14 of the valve box 11 is formed so that the virtual plane p including the contact surface 14a with the valve body 13 is substantially orthogonal to the axial center of the valve box straight pipe portion 20. It became possible to do. This facilitated machining of the valve seat 14.

[0019]

As described above, according to the present invention, the rubber lining to be applied to the valve body is formed thicker in a portion where the distance from the rotary shaft of the valve body is larger and the speed of the valve body is faster. The damage of the rubber lining due to the collision between the valve body and the valve seat is almost uniform regardless of the distance from the rotation spindle, and the waste during repair of the rubber lining can be reduced. With the rubber lining thus formed, the inclination of the valve body with respect to the internal flow passage can be secured, so that the valve seat of the valve box does not have to be inclined with respect to the axial center of the straight part of the valve box as in the conventional case. It can be formed and can be easily machined.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a check valve including a rubber lining structure according to the present invention.

FIG. 2 is a sectional view showing a conventional check valve.

[Explanation of symbols]

 11 Valve box 12 Internal flow path 13 Valve body 14 Valve seat 17 Rotating spindle 18,19 Rubber lining

Claims (1)

[Claims] 1. A valve body is disposed inside a valve box so as to be swingable about a position where an internal flow passage is opened and a position where the internal flow path is fully closed, with a rotary support shaft as a swing center, and the valve body is provided on an inner peripheral surface of the valve box. A valve lining structure for forming a valve seat in which the valve body is in pressure contact at a fully closed position, and a check valve having a rubber lining structure in which a rubber lining is applied to an inner peripheral surface of a valve box including the valve seat and an outer peripheral surface of the valve body, A rubber lining structure for a check valve, wherein the rubber lining of the valve body is formed thicker on a valve seat side as a distance from a rotation spindle increases.