JPS6020861Y2 - self-sealing closure device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-sealing closure device for pressure piping and pressure vessels, especially in nuclear installations, having a flat bell valve guided in a valve body.

Closing devices used in nuclear power plants, such as sodium cooled nuclear reactors, require a high degree of shielding and reliability.

An overview of shielding devices conventionally used in nuclear reactors is introduced in various literature.

However, these devices have a compact and simple configuration, especially in the axial direction of the pipe, and operate reliably by a mechanism that applies only the necessary operating force, which is the basis of the present invention. In addition, the sealing surface is automatically cleaned, and even when the shielding device is open, the sealing surface is covered with another member to prevent the fluid flowing through the pipe from touching the sealing surface, ensuring a good sealing effect for a long period of time. There is no such thing as a guarantee.

According to the invention, the above-mentioned object is achieved in that the flat valve has, in its closed position, an opening corresponding to the pipeline at a location coinciding with the axis of the pipeline to be closed; A seal ring and a seal plate are respectively disposed on the pressure side and the opposite side so as to be movable in the axial direction and concentrically with respect to the opening, and the seal ring and the seal plate are each attached to the flat slide valve via a spring ring. The sealing surface of the sealing ring and sealing plate is pressed against the sealing surface of the valve body by this spring ring, thereby reaching the sealing surface of the sealing plate.

As a result, the sealing surface of the sealing plate on the non-pressure side is pressed against the corresponding sealing surface of the valve housing, and the sealing ring on the pressure side is likewise pressed against the corresponding sealing surface of the valve housing.

Therefore, the sealing surface of the seal plate is strongly pressed against the corresponding sealing surface of the valve box by the pressure itself acting on the valve box due to the fluid in the pipe, and the pipe can be reliably closed. Even when the pressure of the fluid in the passageway decreases, and the pressure of the fluid acting inside the valve box becomes slight or no pressure at all, the sealing surface of the seal plate will be pressed against the valve box by the pressing force of the spring ring. is strongly pressed against the corresponding sealing surface of the pipe, so that the closure of the conduit is not broken.

Further, when the flat valve is operated, dirt adhering to the sealing surfaces is automatically cleaned by friction caused by mutual movement of the sealing surfaces of the sealing plate, sealing ring, and valve body.

In order to protect the sealing surface from the adverse effects of the fluid contained in the pipeline on the sealing surface even in the open state of the flat slide valve, the present invention further provides that the flat slide valve protects the sealing surface of the pipeline in its open state. A further opening corresponding to the cross section of the conduit is provided at a location coinciding with the axis, and two sealing rings movable in the axial direction concentrically with respect to the opening are arranged within this opening, and these sealing rings It is fixed to the flat slide valve via a spring ring.

As a result, when the flat slide valve is actuated and the closing device is opened, both seal rings are located at the positions where the seal plate and seal ring previously described, and protect the seal surface of the valve body. By preventing leakage of fluid from the valve body portion, virtually no pressure drop occurs in the fluid flowing through the conduit.

According to another embodiment of the invention, the spring ring is prestressed in the opposite axial direction.

According to another embodiment of the present invention, a spring may be arranged between the seal rings or seal plates to apply a pressing force to press the seal rings or seal plates against the valve body sealing surface.

The pressing force exerted by this spring can be implemented in addition to the pressing force exerted by the spring ring, or instead of it.

In any case, when the closure device is used under very low pressure due to a pressure reduction of the fluid in the line, or even in the absence of pressure, the sealing ring or sealing plate is operated by a spring ring or a spring. It is pressed against the sealing surface of the valve body with enough force to seal.

The advantage of the closure device according to the invention is that it not only maintains a good sealing effect for a long time, but also has a simple structure that does not take up much space in the axial direction, and hardly prevents fluid flow in the open state.

Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a valve body 2 consisting of two symmetrical halves is inserted into a conduit 1 in a closure device according to the invention.

Inside the valve box 2, there are three parts that are firmly connected to each other.
A flat valve 3 having a circular opening corresponding to the cross section of the pipe line 1 is guided, and a sealing plate 4 and a sealing ring 5 are disposed within the circular opening so as to be movable concentrically and in the axial direction. has been done.

The seal plate 4 and the seal ring 5 are held on the flattened valve 3 by two spring rings 6, and are pressed against the wall surface of the valve box 2, that is, the seal surface.

The spring ring 6 is fixed within the flattened valve 3 by a clamp ring 7 and to the seal plate 4 and seal ring 5 by another clamp ring 8.

To open the closing device, the flat valve 3 is pulled upwards by means of two actuating rods 9 in this example.

At this time, dirt adhering to the seal surfaces of the valve box 2, seal plate 4, and seal ring 5 is cleaned by the friction generated when they move relative to each other.

In the open state of the closure device, the positions of the sealing plate 4 and the sealing ring 5 are replaced by two further sealing rings 10.

This sealing ring 10 is arranged concentrically in another circular opening of the flat valve 3 which also corresponds to the cross-section of the line 1 and is held in the flat valve 3 by a further spring ring 11. ing.

The spring ring 11 is likewise secured to the flattening valve 3 by a further clamping ring 12 and to the sealing ring 10 by a further clamping ring 13.

In order to discharge any leakage from the valve body 2 that should occur, a discharge pipe 14 provided in the valve body 2 is used.

The operating rod 9 is not shown in detail in Fig. 15.
It passes through the valve body 2 and is led out from the valve body 2.

Depending on the intended use of the closing device, the seal 15 is formed, for example, as a refrigerating gas or shutoff gas seal or by a bellows.

In addition to the above-mentioned parts, FIG. 2 also shows one of a plurality of springs 16, for example, a coil spring, which are disposed separately on the circumference between the seal plate 4 and the seal ring 5.

The spring 16 acts to press the sealing surfaces of the sealing plate 4 and the sealing ring 5 against the respective corresponding sealing surfaces of the valve body 2.

Furthermore, a spring ring 6 is shown arranged to ensure some axial movement of the sealing plate 4 and sealing ring 5.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of one embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of a different embodiment of the present invention. 1...Pipe line, 2...Valve box, 3...
...Flat slide valve, 4...Seal plate, 5...
... Seal ring, 6... Spring ring.

Claims (1)

[Scope of utility model registration request] The flat valve 3 inserted into the valve body 2 has an opening corresponding to the pipe line 1 at a location that coincides with the axis of the pipe line 1 to be closed in its closed position, and a pressure side in the opening. A seal ring 5 is disposed, and a seal plate 4 is disposed on the side opposite to the pressure side so as to be movable concentrically and axially with respect to the opening, and the seal ring 5 and the seal plate 4 are connected to each other via a spring ring 6. A self-sealing type closing device which is attached to a flattened valve 3 and is configured such that the spring ring 6 presses the sealing surfaces of the sealing ring 5 and the sealing plate 4 against the sealing surface of the valve body 2. .