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Yangzhou Kaidesi Environmental Protection Equipment Co., Ltd. specializes in the development of electric valves and electric actuators

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Knowledge about cryogenic valves

发表时间:2018-04-03 12:23:49 Article source: Publication time: 2018-04-03 12:23:49

High temperature valves tend to rotate dexterously at normal temperature, which is very tight at high temperatures, and can not even be opened.

In operation, due to incomplete heating at the valve, or water in the valve packing, thawing at high temperatures, or blocking the valve too tightly at normal temperature, causing the wire buckle to bite, etc., Yangzhou Hengdian's electric actuators , The fixing of the valve and the cold box can be elastically connected to prevent the valve stem from deforming to be different from the valve body. In the bare cold period, the condition of the valve device should be reviewed and adjusted in the cold condition. When the valve is blocked after the invention is found, The fixed flange of the adjustable agent valve on the cylinder shell makes it easy to open and close. How to deal with high temperature valves is prone to seizure

The high temperature valve is installed at normal temperature and is obligated at high temperature. The temperature change is very large.

In order to prevent the valve from being stuck, the design should adopt open rod structure and coarse trapezoidal thread; on the device, there should be a swaying bracket at the valve to prevent the valve rod from being bent with the displacement of the pipeline. Adding cold damage, the valve stem is often made very long, and it will become stuck and deformed randomly during operation. During operation, the heating before starting should be thorough, and the valve should not be leaked when the valve is blocked. Do not use excessive force. The operation of the valve is at room temperature, and the circulation is at high temperature.

When the device is installed, the valve and pipeline are unreasonably configured and prestressed; or the pipeline cold compensation is poor and the valve position is changed at high temperature; or the valve lacks a bracket and deforms at high temperature; or the valve is improperly fixed and the cold box is deformed at high temperature and affects Concentricity of valve stem and valve body, stainless steel for ordinary valve stem, linear expansion coefficient is 1.73 × 10-6 ℃ -1; valve sleeve is brass, linear expansion coefficient is 19.9 × 10-6 ℃ -1, that is, brass The expansion is larger than stainless steel. It can bite the wire buckle at high temperature. The important reasons for the valve to be stuck at high temperature are:

In terms of design, due to the different materials of the valve stem and the valve sleeve, the linear expansion coefficients are different. If the design and the device are improper, thermal stress or deformation will occur easily, especially when the dark stem structure and fine thread are used. Large variation range, small thread clearance, more likely to bite,

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