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Application of negative expansion material in low-temperature valve

A negative expansion material and low temperature technology, which is applied in the field of low temperature valves, can solve the problems of valve damage and small strain, and achieve the effects of reducing loss and risk, reducing possibility and reducing impact

Inactive Publication Date: 2020-02-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Generally, the approximate temperature range of the valve application is already known when the valve is made, so that the approximate stress caused by the temperature difference change can be calculated in advance, so that a pre-tightening force will be given in advance, which will make the strain relatively small, but it is easy to make the valve Long-term under the pressure given by the pre-tightening force when closing, it is easy to damage the valve faster

Method used

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  • Application of negative expansion material in low-temperature valve
  • Application of negative expansion material in low-temperature valve

Examples

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Embodiment 1

[0024] The cryogenic valve in this embodiment is a DN100 ball valve, and its structure is shown in the attached figure 1 , mainly includes a valve body 1, a cavity in the valve body 1, a ball 2 is arranged in the cavity, and the ball valve also has a valve stem 3, an upper bearing 4, a lower bearing 5, a valve seat 6 and a spring 7 and other components.

[0025] In this embodiment, the part where the lower end of the cavity is in contact with the sphere is mixed with a negative expansion material during fabrication, so that the overall change is zero or approximately zero when the temperature changes. The thickness of the DN100 ball valve in this embodiment is 24mm, the ambient temperature is 22°C, the operating condition of the ball valve is medium temperature -162°C, and the pressure is 4MPa. For example, 2 is the temperature field distribution of the ball valve simulated by fluent. Without adding preload, the maximum deformation of the bottom of the cavity is 0.056mm. We ...

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Abstract

The invention relates to the application of a negative expansion material in a low-temperature valve. The low-temperature valve is provided with a valve body, wherein a cavity is formed in the valve body, a ball body is arranged in the cavity, the negative expansion material is compounded with the material for manufacturing the low-temperature valve, the compounded material is applied to the valvebody in contact with the ball body, and the integral zero change or the near-zero change of the valve body when the temperature is changed is achieved. Compared with the prior art, the application ofthe negative expansion material in the low-temperature valve can realize or approximately realize the zero change of the valve, the possibility of contact between a fluid and the outside is reduced,and therefore, the unnecessary loss and danger caused by temperature change are reduced.

Description

technical field [0001] The invention relates to the technical field of cryogenic valves, in particular to the application of a negative expansion material to cryogenic valves. Background technique [0002] With the continuous development and progress of society, people pay more and more attention to reducing loss and waste, and the loss in the transportation and transmission of cryogenic fluid is also valued by people. Due to the particularities of cryogenic fluids, cryogenic media are usually flammable, explosive, and highly permeable substances, so cryogenic valves must have corresponding anti-corrosion properties to ensure their safety. . [0003] Cryogenic valves refer to valves that can be used under low temperature conditions. We usually refer to valves with operating temperatures below -40°C as cryogenic valves. Cryogenic valves are indispensable and important equipment in petroleum industry, air separation, natural gas and other industries. The quality and effect o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/08
CPCF16K5/0657F16K5/08
Inventor 曹强贺邑虎
Owner TONGJI UNIV