JPH042833B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a valve box with a seat ring that acts as a seat through contact with a valve body and is movable in the direction of distance from and near the valve body. This invention relates to a seat on the valve body side of a valve that is provided with a spring that presses a ring toward the valve body.

[Conventional technology]

Conventionally, in the valve box side seat part, as shown in FIG. 3, the seat ring 4 is slidably fitted into the valve box 1, and the spring is disposed between the seat ring 4 and the valve box 1. It was formed from a disc spring 20 that was

[Problem that the invention seeks to solve]

However, there is a risk that foreign matter flowing inside the valve box may enter the gap between the disc spring 20 and the seat ring 4 or the valve box 1, causing malfunction of the disc spring 20.

An object of the present invention is to prevent foreign matter from entering between the spring and the seat ring or valve box.

[Means for solving problems]

The characteristic configuration of the valve box side seat part of the valve in the present invention is that the seat ring is slidably fitted into a guide ring fitted to the valve box, and the middle part of the spring bulges outward in a cross-sectional view, and A cylindrical first part that separates both ends as its radius of curvature increases.
The second spring is composed of a spring and a cylindrical second spring whose middle part bulges inward in both transverse views and which separates both ends as the radius of curvature increases, and extends between the guide ring and the seat ring. , while fitting the first spring to the outside,
The second spring is fitted into the first and second springs.
Both ends of the spring in the axial direction are separately welded to the guide ring and the seat ring over the entire circumference, and the effects are as follows.

[Effect]

In other words, the first spring fitted on the outside of the guide ring and the seat ring, and the second spring fitted on the inside, are welded separately at both ends in the axial direction to the guide ring and the seat ring, respectively, over the entire circumference. Therefore, there is no gap between the first and second springs and the guide ring or seat ring for foreign matter to enter. 2. The function of the spring can be maintained well.

Moreover, as fluid pressure acts on the bulges formed in the first and second springs, the radius of curvature increases, increasing the pressing force of the first and second springs against the seat ring, and causing the seat ring to open. The pressure force against the body increases.

〔Effect of the invention〕

Therefore, malfunction of the spring due to the insertion of foreign matter can be eliminated, and the sealing performance of the seat ring can be maintained well over a long period of time.Furthermore, since the contact force of the spring is increased using fluid pressure, the fluid pressure is increased. Even if the pressure rose, the pressure force of the seat ring against the valve body automatically increased accordingly, making it possible to further improve the sealing performance of the seat ring.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 2, a valve body 1 is equipped with a steel ball valve body 2 having a flow passage hole f communicating with a flow passage F in the valve body through which high-temperature, high-pressure fluid such as coal, oil, gas, etc. passes. A valve stem 3 that rotates the ball valve body 2 between an open position and a closed position is supported through the valve body 1, and a seal is created by contact with the partially spherical seat portion 2a of the ball valve body 2. A pair of working metal valve box side seat rings 4 are provided so as to be movable in the direction of distance from and near the valve body 2, and a spring 5 is provided to press the seat rings 4 toward the valve body side.
It is configured as a ball valve.

The valve box side seat portion of the ball valve 6 is constructed as shown in FIGS. 1 and 2.

That is, on the inner surface of the flow path F of the valve body 1, the annular step portions 7 formed on both sides of the valve body 2 over the entire circumference,
A ring-shaped intermediate member 8 and a guide ring 9 are fitted into each guide ring 9, and a seat ring 4 is fitted into each guide ring 9 so as to be slidable in the direction along the flow path F. The cylindrical first spring 5A has a cylindrical first spring 5A that bulges outward, and fluid pressure acts on the bulged portion to separate both ends as the radius of curvature increases; The second spring 5B is made up of a cylindrical second spring 5B that bulges out, and similarly to the above, fluid pressure acts on the bulge part to separate both ends as the radius of curvature increases, and the guide ring 9 and the seat ring 4, the first spring 5A is fitted externally, and the second spring 5B is fitted internally, and both ends of the first and second springs 5A, 5B in the axial direction are guided around the entire circumference. ring 9
and are welded to the seat ring 4 separately.

The guide ring 9 is inserted into the flow path F via the intermediate member 8 by adjusting the seal adjusting cylinder 11 screwed into the inner surface of the piping portion 10 on both sides of the ball valve 6 along the flow path F direction. The positioning along the valve body 2 is performed, and along with the adjustment, the degree of pressure contact of the seat ring 4 with the valve body 2 is adjusted.

Between the intermediate member 8 and the guide ring 9,
As the intermediate member 8 and the guide ring 9 come close to each other, the guide ring 9 and the valve box 1 come into pressure contact with the inner surface of the valve box 1.
A ring-shaped gasket 12 is sandwiched between the two for sealing.

The valve box 1 is divided into a valve box body 1A and a lid portion 1B having a larger diameter than the valve body 2. The lid portion 1B is removed upward from the valve body body 1A, and the cylinder 11 is retreated to remove the guide ring. When the valve body 9 is retired in the direction away from the valve body 2, the space between both seat rings 4 is opened, and the valve body 2 can be taken out and put in the vertical direction, and the seat ring 4 and the guide ring 9 can be taken out. be.

[Another example]

The present invention can be applied to the valve box side seat portion of other valves such as gate valves in addition to ball valves.

[Brief explanation of drawings]

The drawings show an embodiment of the valve box side seat part of the valve according to the present invention, FIG. 1 is a sectional view of the main part, FIG. 2 is a sectional view of the entire valve, and FIG. 3 is a sectional view of the waist part showing a conventional example. be. 1... Valve box, 2... Valve body, 4... Seat ring, 5... Spring, 5A... First spring, 5B... Second spring, 9... Guide ring.

Claims (1)

[Claims] 1. A seat ring 4 that acts as a seal through contact with the valve body 2 is provided in the valve box 1 so as to be movable in a direction toward and away from the valve body 2, and a spring 5 is provided that presses the seat ring 4 toward the valve body. The seat ring 4 is slidably fitted into a guide ring 9 fitted to the valve box 1 of a valve box side seat part of a certain valve, and the spring 5 is arranged so that the middle part faces outward in a cross-sectional view. A cylindrical first spring 5A that bulges and separates both ends as its radius of curvature increases, and a cylindrical first spring 5A that bulges inward at its middle portion in a cross-sectional view and that separates its ends as its radius of curvature increases. a cylindrical second spring 5 that separates the parts;
The first spring 5A is fitted externally across the guide ring 9 and the seat ring 4, and the second spring 5B is fitted internally, so that the first and second springs 5A and 5B are A valve box-side seat portion of the valve whose axially opposite ends are separately welded to the guide ring 9 and the seat ring 4 over the entire circumference.