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Disperse combined stuffing structure of low-temperature ball valve

A combination of packing and low temperature technology, applied in valve details, valve devices, cocks including cut-off devices, etc., can solve problems such as external leakage of low-temperature ball valves, and achieve the effect of reducing the entry of low-temperature media, improving overall service life, and improving safety performance.

Pending Publication Date: 2018-05-08
CHINA HUANQIU CONTRACTING & ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of external leakage of cryogenic ball valves, and provides a fugitive composite packing structure of cryogenic ball valves with good sealing performance, high safety level and low operating torque

Method used

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  • Disperse combined stuffing structure of low-temperature ball valve

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Embodiment Construction

[0015] Such as figure 1 As shown, the present invention provides a low-temperature ball valve fugitive combined packing structure, which is to wear a pressure plate 8 and a pressure sleeve 6 on the valve stem 10, and the pressure plate 8 is fixedly connected to the valve cover 1 through bolts 7 and nuts 9 , and the packing group is fixed in the valve cover 1 through the pressure sleeve 6, and the packing group includes from the inside to the outside: a low-temperature spring energy storage sealing ring 2, a V-shaped packing 3, a spacer ring 4 and a flexible graphite group 5, in:

[0016] The lowermost end is the low temperature spring energy storage sealing ring 2, which can meet the continuous sealing performance under the medium working condition of -196°C. The pre-tightening force of the spring and the pressure of the medium realize sealing. The greater the pressure of the medium, the tighter the low-temperature spring energy storage sealing ring 2 and the inner surface of...

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Abstract

The invention provides a disperse combined stuffing structure of a low-temperature ball valve. The disperse combined stuffing structure comprises a low-temperature spring energy-accumulating sealing ring, V-shaped stuffing and a flexible graphite group from inside to outside, wherein an opening of the low-temperature spring energy-accumulating sealing ring is inward; the V-shaped stuffing is madeof a PTFE material; and the flexible graphite group is a low-leakage forming flexible graphite group which consists of upper and lower knitting end rings and a plurality of graphite rings in the middle. The low-temperature spring energy-accumulating sealing ring can provide a beneficial primary low-temperature sealing environment, so that low-temperature medium entering is reduced; a wear-resisting and anti-scratch V-shaped stuffing group made of the PTFE material is used, so that the integral service life of a stuffing box can be prolonged; and the low-leakage forming flexible graphite groupis used, so that a fireproof function is achieved while sealing performances are guaranteed. Therefore, the disperse combined stuffing structure has triple independent sealing structural design, meetssafe operation, under various extremely dangerous working conditions, of the valve, and improves safety performances of the valve.

Description

technical field [0001] The invention relates to a fugitive combined packing structure which can be used in low temperature working conditions and has strict sealing requirements for low temperature ball valves. Background technique [0002] With the continuous development of science and technology and the chemical industry, the application of cryogenic ball valves in the low temperature industry is becoming more and more extensive. At present, the research work on cryogenic ball valves at home and abroad is also constantly advancing to meet the rapid development of modern industrialization. Now the country implements the localization policy on major industrial equipment and key devices, and the demand for domestic low-temperature ball valves in many low-temperature projects is increasing year by year, so the requirements for their safety performance are also getting higher and higher. This requires special design of the sealing packing structure and special selection of seal...

Claims

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Application Information

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IPC IPC(8): F16K41/04
CPCF16K5/0673F16K5/0694
Inventor 贾琦月柳成安王邦捷黄永刚戴文柏李玉龙代永清张鹏王秀彭涛明
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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