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Top-entry low-temperature fixed ball valve

A fixed ball valve, low temperature technology, applied in valve details, valve devices, cocks including cut-off devices, etc., can solve problems such as overpressure, and achieve low torque, reliable operation, and good sealing performance.

Active Publication Date: 2014-04-09
NEWAY VALVE SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, due to the presence of low-temperature medium, the valve cavity and the cavity between the extended bonnet and the valve stem are prone to overpressure due to heat

Method used

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  • Top-entry low-temperature fixed ball valve
  • Top-entry low-temperature fixed ball valve
  • Top-entry low-temperature fixed ball valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Example: see attached figure 1 to attach image 3 As shown, a top-entry low-temperature fixed ball valve includes a valve body 1, a valve seat arranged in the valve body 1, a ball 4 cooperating and sealing with the valve seat, a valve stem 5 connected with the ball 4, and a valve stem 5 sleeved on the valve stem 5. The valve cover 2 which is sealed and fixed with the valve body, the valve body 1, the valve seat, and the through holes on the ball 4 are connected to form a fluid passage. The valve seat includes an upstream valve seat 3 and a downstream valve seat 6. The upstream valve seat 3 There is a communication groove 7 at the junction with the sphere, the communication groove 7 communicates the fluid channel and the valve cavity, and a graphite fire ring 8 is provided between the upstream valve seat 3 and the valve body 1; It is equipped with a sealing structure composed of a universal sealing ring. The upper part of the bonnet 2 and the valve stem 5 is provided w...

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Abstract

The invention discloses a top-entry low-temperature fixed ball valve. The top-entry low-temperature fixed ball valve comprises a valve body, a valve seat, a ball body, a valve rod and a valve cover, wherein the valve body, the valve seat and a through hole on the ball body are connected to form a fluid channel, and the valve seat comprises an upstream valve seat and a downstream valve seat. The top-entry low-temperature fixed ball valve is characterized in that a joint part between the upstream valve seat and the ball body is provided with a communication slot, the communication slot is used for communicating the fluid channel with the valve middle cavity, and a seal structure is arranged on the downstream valve seat. Through the top-entry low-temperature fixed ball valve disclosed by the invention, the middle cavity is unlikely to undergo overpressure, the requirement for a seal assembly is reduced, inner leakage and outer leakage are strictly controlled, and the top-entry low-temperature fixed ball valve is especially suitable for a low-temperature valve of a lengthened valve cover structure. Based on an experiment, the top-entry low-temperature fixed ball valve disclosed by the invention operates reliably at low temperature, meet a standard requirement in the leakage of the valve seats and can be used to realize on-line maintenance truly.

Description

technical field [0001] The invention relates to a valve, in particular to a low-temperature valve, in particular to a ball valve with a top-mounted fixed ball structure for low-temperature medium. Background technique [0002] With the increasing development of liquefied natural gas in the international energy market, the application market of cryogenic valves has also become broader. At the same time, domestic liquefied natural gas (LNG) and other low-temperature industries are also developing rapidly, and the demand for low-temperature valves is also growing. [0003] The ball valve uses a ball as the opening and closing part, and is more and more trusted by customers because of its advantages such as small flow resistance, simple structure, reliable sealing, and quick operation. In the prior art, the structure of a ball valve usually includes a valve body, a valve seat arranged in the valve body, a ball and a valve cover that are sealingly connected with the valve seat, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K5/06F16K5/20F16K41/02
Inventor 王胜利陈鉴王建华王国军
Owner NEWAY VALVE SUZHOU
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