Why cryogenic valves easily jammed pull still occur, how to solve? A: work under cryogenic valves installed at room temperature and low temperature, temperature range is very large. If the improper design, installation, it is easy to produce thermal stress and deformation. At the same time, the operation of the valve parts at room temperature, circulation part in low temperature. In order to reduce the cold damage, the valve stem often do very long, also is easy to produce deformation and stuck. Cryogenic valves tend to be flexible rotation at room temperature and low temperature is very tight, even can't open it. is stuck in the low temperature main reasons are: 1, when installation, the valve and pipeline configuration is not reasonable and prestressed; Or pipe cold compensation ability is poor, low temperature valve position change; Lack of support, or valve at low temperature deformation; Improper or fixed valve, protect cold box under the low temperature deformation and affect the concentricity of the valve stem and Industrial Valves body. 2, in the design, because the material of valve stem and valve sleeve is different, different linear expansion coefficient. General stainless steel stem, linear expansion coefficient is 1. 73×10- 6℃- 1; for the brass, the linear expansion coefficient was 19. 9×10- 6℃- 1, that is, the shrinkage of brass is larger than the stainless steel, low temperature could thread is biting. Especially when using non-rising stem structure and fine thread, thread wide temperature range, thread clearance is small, more prone to biting. 3, in operation, due to inadequate valves in heating, water or valve packing, caused in low temperature freezing, or close the valve at room temperature too close, make the thread is chewed, etc. To prevent valve sticking phenomenon, appropriate USES stem on the design structure and coarse thread trapezoidal thread; On the installation should be had strong support in the valve, in order to prevent the valve with the pipeline displacement and pull the valve stem. Valves with fixed can adopt flexible connection of cold box, to prevent the deformation of the valve stem and valve body different heart; During the naked cooling, check under cold condition and adjust valve installation, when found after cooling valve stuck phenomenon, adjustable valve in the fixed on the shell flange, switch freely. In operation, the heating should be thoroughly before start, close the valve to the principle of not leak when don't too hard. This paper keyword search: the yongjia county nott pump Industrial Valves co. , LTD. More supply valve
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