When the low-temperature valve rotates flexibly at room temperature, and it is not flexible or even cannot be opened at low temperature, this situation is generally caused by the following reasons: the material of the valve rod and the valve rod nut is different. Generally, the valve rod is stainless steel, and the valve rod nut is brass. Because the linear expansion coefficient of the two materials is different, the shrinkage of brass is larger than that of stainless steel at low temperature, causing the screw thread to bite; If the heating at the valve is not complete, or the valve packing flows in and out, freezing will also make it difficult to open the valve; In addition, improper fixing of the valve during installation, unreasonable configuration of the valve and pipeline, and change of valve position at low temperature may cause the valve to jam.
The third stage of the intelligent control system developed by DEAR will expand the application of related industries on the basis of full cultivation of the air separation industry. Extend the mature [intelligent numerical control system] to related industries. For example, it is widely involved in industries with alternating gas and liquid phases: the development and transportation of hydrogen energy, synthetic ammonia and related processes, methanol, biomass energy, carbon dioxide recovery of coke oven gas, biogas purification, natural gas and other industries. It will help the intelligent management and energy consumption reduction of the industries involved.
