High-temperature and high-pressure valve packing sealing structure

A packing seal, high temperature and high pressure technology, applied in the shaft seal, valve details, valve device, etc., can solve the problems that affect the sealing stability of the bonnet and valve stem, the medium leaks to the outside of the bonnet, and the packing and valve stem are easy to corrode. , to achieve the effect of preventing fugitive leakage, preventing filler deformation and chemical reaction, and good corrosion resistance

Inactive Publication Date: 2015-02-18
CHONGQING SHANNENG INSTR
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  • Abstract
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Problems solved by technology

[0004] The disadvantages of the above solution are: ①In the high-temperature and high-pressure medium channel system, the valve stem and the valve cover are subjected to heat transfer from the high-temperature medium, and the packing is easily affected by the high temperature, causing deformation or chemical reaction, which ultimately affects the relationship between the valve cover and the valve stem. Sealing stability, the medium is easy to leak to the outside of the valve cover along the valve stem; ②If corrosive gas and liquid are introduced into the high-temperature and high-pressure pipeline system, it is easy to corrode the packing and valve stem, which will eventually affect the sealing performance of the valve body and cause fugitive Give way

Method used

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  • High-temperature and high-pressure valve packing sealing structure

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Embodiment Construction

[0012] The present invention will be described in further detail below by means of specific embodiments:

[0013] Instructions attached figure 1 The reference signs in include: 1-packing gland, 2-O type sealing ring, 3-bottom gasket, 4-carbonized fiber impregnated PTFE braided packing / braided packing, 5-spacer ring, 6-V-shaped four Fluorine filler, 7-cooling water channel, 8-fan heat fin, 9-bonnet, 10-valve stem.

[0014] The embodiment is basically as attached figure 1 As shown: the high temperature and high pressure valve packing seal structure is located in the packing chamber of the valve cover 9, and the valve stem 10 axially penetrates the packing chamber. The high-temperature and high-pressure valve packing sealing structure in this embodiment includes a packing gland 1, which is located at the upper port of the packing chamber and closes the upper port, and the packing gland 1 leaves only the valve stem for the valve stem 10 to move There is a sealing groove on the ...

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Abstract

The invention belongs to the technical field of valves with packing boxes. A high-temperature and high-pressure valve packing sealing structure comprises a packing gland which is used for sealing an upper port of a packing cavity of a valve cover, wherein a sealing groove is formed in the inner wall of the packing gland; an O-shaped sealing ring is mounted in the sealing groove. The high-temperature and high-pressure valve packing sealing structure is characterized in that a bottom pad is arranged at the bottom of the packing cavity; a soaking packing assembly is arranged between the packing gland and the bottom pad and comprises braided packing; the braided packing is provided with polytetrafluoroethylene packing and a spacer ring; a cooling water runner which surrounds the exterior of the packing assembly is arranged in the valve cover. The high-temperature and high-pressure valve packing sealing structure has the advantages of high corrosion resistance and higher sealing stability.

Description

technical field [0001] The invention belongs to the technical field of valves with stuffing boxes. Background technique [0002] In the high-temperature and high-pressure medium channel system, the minimum requirements for high-temperature and high-pressure valves are high temperature above 350° and high pressure above 20Mpa, ensuring no leakage inside and outside, and continuous operation without failure. High-temperature and high-pressure valves generally include a valve seat, a valve cover, a valve core and a valve stem. The valve seat and the valve cover are connected to form a chamber for containing the valve core. , the valve stem drives the valve core to move up and down to make the valve open and close gradually. [0003] In order to prevent the medium in the valve body from leaking out, the valve stem in a moving state needs to be dynamically sealed with the valve cover. The sealing of the valve stem is usually in the form of a stuffing box. The existing stuffing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K49/00F16K41/02
CPCF16K49/00F16K41/02
Inventor 李立光
Owner CHONGQING SHANNENG INSTR
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