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Pressure self-balancing bidirectional sealing valve seat structure

A two-way sealing and self-balancing technology, applied in the direction of valve devices, cocks including cut-off devices, mechanical equipment, etc., can solve the problems of unguaranteed sealing performance, damage to the sealing structure of the valve seat, and failure to restore to the ideal state, etc., to improve once Effective assembly qualification rate, reliable sealing, and elimination of internal leakage risk

Active Publication Date: 2021-10-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing cryogenic ball valve seals have a large amount of deformation under ultra-low temperature conditions, and the seals will be displaced under pressure, and cannot be restored to the ideal state at the initial stage of assembly, and the sealing performance cannot be guaranteed
Especially in the sealing structure of the seat of the existing cryogenic ball valve, the position of the piston is a closed cavity, in which the medium is easy to remain. irreversible damage

Method used

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  • Pressure self-balancing bidirectional sealing valve seat structure

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 and figure 2 The illustrated embodiment of the present invention includes: a valve body 1, a valve seat assembly 2 and a ball 23, wherein the valve seat assembly 2 and the ball 23 are installed in the valve body 1, and the valve seat assembly 2 and the ball fixed to the valve body 1 23 sealing fit; valve seat assembly 2 includes: axial bolt connection assembly 30, valve seat support 10, pressure relief valve 22, insert 9, one-way valve and two-way sealing assembly; wherein the radial side of valve seat support 10 passes through the shaft The bolt connection assembly 30 is connected to the valve body 1, and the two-way sealing assembly is arranged in the inner cavity of the valve body connection part provided between the valve seat support 10 and the valve body 1; the pressure relief valve 22 is installed in the pressure relief hole i...

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Abstract

The invention discloses a pressure self-balancing bidirectional sealing valve seat structure, and belongs to the technical field of cryogenic valves. A valve seat assembly and a ball body are installed in a valve body; the valve seat assembly comprises a valve seat support installed in the valve body, a bidirectional sealing assembly arranged in an inner cavity of a valve body connecting part between the valve seat support and the valve body and a pressure release valve arranged in the valve seat support, and the pressure release valve is communicated with the inner cavity of the valve body connecting part and a medium channel outside the valve seat support. By designing the pressure release valve, when the pressure in the cavity provided with the bidirectional sealing assembly abnormally rises and exceeds 1.33 times of the designed rated working pressure of the valve, excess pressure in the cavity is released into the channel through the pressure release valve, and the risk that the valve seat bidirectional sealing assembly is damaged under pressure accumulation can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of cryogenic valves, in particular to a pressure self-balancing bidirectional sealing valve seat structure. Background technique [0002] China's energy consumption structure is dominated by coal. With the improvement of environmental protection requirements, the proportion of clean energy in primary energy will be greatly increased. Especially in recent years, domestic demand for pipeline natural gas and LNG liquefied natural gas has increased. "Gas shortage" has become the norm, and it is difficult to improve in the short term. LNG liquefied natural gas has the advantages of extremely high compression ratio (625:1), convenient transportation (shipping), easy peak shaving, and lower cost than long-distance pipeline transportation of natural gas. Therefore, with the increasing demand and development of LNG liquefied natural gas in the domestic and international energy markets, LNG liquefaction plants, recei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/20
CPCF16K5/0673F16K5/0689F16K5/201
Inventor 田凌曾冠斌
Owner TSINGHUA UNIV
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