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Low-temperature top-assembling type fixed ball valve

A fixed ball valve, mounted technology, used in valve devices, cocks including cut-off devices, engine components, etc., can solve the problem of poor sealing performance of the pan plug sealing ring, the sealing ring is not tightly fitted, and the overall travel tolerance is difficult, etc. problem, to achieve the effect of good sealing performance, avoiding the reduction of sealing performance and long service life

Inactive Publication Date: 2017-03-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the existing low-temperature top-entry trunnion ball valve uses the pan-seal ring to release the pressure, which easily leads to the deterioration of the sealing performance of the pan-seal ring; After the ball and the valve stem are connected, it is difficult to ensure the overall position tolerance, which leads to the insufficient tightness between the upstream and downstream sealing rings of the valve seat and the ball, resulting in seal leakage; Not conducive to seat sealing

Method used

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  • Low-temperature top-assembling type fixed ball valve

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Embodiment Construction

[0046] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] An embodiment of the present invention provides a low-temperature top entry fixed ball valve, see figure 1 and combine Figure 2 ~ Figure 6 , the cryogenic top entry fixed ball valve includes: valve body 1, ball 3, upstream valve seat 11, downstream valve seat 12, valve cover 19, valve stem 20, connecting bracket 25 and actuator 26; the ball 3 is located inside the valve body 1; The upstream valve seat 11 and the downstream valve seat 12 are located between the sphere 3 and the valve body 1 and on both sides of the sphere 3, and a valve seat fixing ring 8 is arranged between the upstream valve seat 11, the downstream valve seat 12 and the valve body 1; 1 and the valve cover 19 are connected by bolts and nuts; the actuator 26 is fixed on the con...

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Abstract

The invention discloses a low-temperature top-assembling type fixed ball valve and belongs to the technical field of ball valves of liquefied natural gas pipelines. The low-temperature top-assembling type fixed ball valve comprises a valve body, a ball body, an upstream valve seat, a downstream valve seat, a valve cover, a valve rod, a connecting support and an actuator; an upper short shaft and a lower short shaft are arranged at the upper end and the lower end of the ball body correspondingly, the upper short shaft, the lower short shaft and the ball body are of an integrated structure, and the valve rod is connected with the upper short shaft; first elastic compensating components and spring seal rings are arranged between the upstream valve seat and the valve body and between the downstream valve seat and the valve body; the upstream valve seat is of a step-type structure and can move in the horizontal direction; and the downstream valve seat is of a step-type structure and can move in the horizontal direction. The low-temperature top-assembling type fixed ball valve is high in size accuracy, good in the sealing property, long in service life and capable of meeting the demand that the ball valve is used at the temperature of minus 162 DEG C. Even if a caliber reaches six inches or above, all properties of the low-temperature top-assembling type fixed ball valve can still meet the demand.

Description

technical field [0001] The invention relates to the technical field of liquefied natural gas pipeline ball valves, in particular to a low-temperature top-loading fixed ball valve. Background technique [0002] Liquefied Natural Gas (LNG) is colorless, odorless, non-toxic and non-corrosive. It is recognized as the cleanest energy source on earth, and its main component is methane. Liquefied natural gas is obtained by cooling gaseous natural gas to -162°C at atmospheric pressure. [0003] Cryogenic top-entry fixed ball valves are commonly used ball valves on process pipelines such as natural gas liquefaction stations and receiving stations. They are used to cut off liquefied natural gas. Maintenance of fixed ball valves. In the existing low-temperature top entry fixed ball valve, one end of the valve stem is connected to the ball through a key connection, and the other end is connected to the actuator after passing through the valve cover. The actuator drives the ball to rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/08
CPCF16K5/0605F16K5/08
Inventor 张玉峰魏奇刘晓东包彦平
Owner BC P INC CHINA NAT PETROLEUM CORP
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