LNG stop valve

A technology of stop valve and valve stem, which is applied in the direction of lifting valve, valve details, safety valve, etc., can solve the problems of large volume, seal leakage, and heavy design, and achieve the advantages of small valve volume, reduced design pressure, and reduced heat transfer rate Effect

Inactive Publication Date: 2014-05-14
张周卫
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the characteristics of low-temperature transportation of LNG at -162℃, the present invention invented the LNG stop valve, which is used to solve the traditional problems of sealing leakage, safety control, large volume, bulky design, and too long valve stem when transporting LNG. It can improve the control efficiency of the LNG process in the pipeline, reduce the design pressure of the system, reduce the volume of the valve, and improve the safety of the LNG system, etc.

Method used

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Embodiment Construction

[0015] Processing and manufacturing of main components of LNG stop valve, including hand wheel (1), stem nut (2), upper bearing (3), stop ring (4), compression nut (5), compression screw (6), first Sealing ring (7), compression pin (8), second sealing ring (9), third sealing ring (10), fourth sealing ring (11), elastic sealing ring (12), left cooling fin ( 13), upper valve body (14), sixth sealing retaining ring (15), valve stem bolt (16), valve disc cover (17), lower valve body (18), valve disc (19), lower valve stem ( 20), valve stem spring (21), sixth sealing ring (22), upper valve stem (23), right cooling fin (24), elastic sealing support ring (25), fifth sealing ring (26), The third stuffing box (27), the second stuffing box (28), the first stuffing box (29), the stuffing box gland (30), the stuffing box gland (31), the compression nut spring washer (32), the stopper Rotary pin (33), lower bearing (34), bearing pressure sleeve (35), hand wheel nut (36), etc., under the l...

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Abstract

The invention relates to a 162-degree LNG stop valve. The technology of a shrinkable elastic valve rod provided with a prestress spring, the maze sealing technology, the multi-sealing all-welded valve technology and the like are adopted, the LNG stop valve can freely shrink according to the temperature difference stress of a low-temperature valve body so as to adapt to changes of temperature of the valve body, stress required by the sealing face of the valve can be maintained, and leakage caused by temperature difference strain can be prevented. The height of the whole valve rod can be effectively reduced, the whole size of the LNG stop valve can be reduced, and the dual functions of LNG stopping and safety are achieved; the design pressure of the valve and the design pressure of an LNG conveying system can be effectively reduced, the size of the valve can be smaller, the safety is higher, and the machining and manufacturing cost is lower.

Description

technical field [0001] The invention relates to a -162°C LNG cut-off valve, which adopts shrinkable elastic valve stem technology with prestressed springs, labyrinth sealing technology and multiple-seal fully welded valve technology, etc., and can freely shrink according to the temperature difference stress of the low-temperature valve body to adapt to the valve. The temperature change of the body maintains the required prestress on the sealing surface of the valve and prevents leakage caused by temperature difference strain. It can effectively reduce the height of the overall valve stem, reduce the overall size of the LNG stop valve, and has dual functions of LNG cut-off and safety; it can effectively reduce the design pressure of the valve and the design pressure of the LNG delivery system, the valve is smaller in size, higher in safety, and easier to process Manufacturing costs are lower. Background technique [0002] In the field of LNG low temperature at -162℃, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/02F16K1/32F16K27/02
CPCF16K1/02F16K1/32F16K17/0486F16K27/0281F16K27/102F16K41/06F16K49/00
Inventor 张周卫汪雅红张小卫薛佳幸李跃
Owner 张周卫
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