Pneumatic - valve matters needing attention in low temperature

Low temperature pneumatic - valve note 1, should be installed in horizontal pipe runs vertically, under special circumstances need horizontal or inclined installation, general should add support. From the box wall park board and wall of heat preservation box should be parallel. 2, shall be installed near the ground or floor, so that lies in the maintenance, the fitted with valve positioner or the handwheel institutions, should guarantee the observation, adjustment and operation and convenient. 3, generally set by-pass pipe, so that in the control system failure or maintenance of pneumatic control valve switch to the manual operation, not to stop production. 4, equipped with a handwheel agency, also can be omitted by-pass line: manual operation, also can be used to limit the opening of the valve. When to stop using the handwheel institutions must be restored to its original neutral position, and automatic control system on the rails. 5, when installation, should make the flow direction of medium and direction indicating valve body. 6, pneumatic control valve before installation to pipeline cleaning dirt, slag. After installation, pneumatic control valve fully open, the pipeline, valve and other cleaning and test of the joint sealing. Cryogenic pneumatic - valve by pneumatic diaphragm actuator and low temperature resistant, two-seat valves in two parts. By the regulator to the signal input pneumatic diaphragm actuator air chamber pressure, generate thrust, by connecting rod drives the valve core, valve core position changes make the valve flow, cross-sectional area changes of medium flow rate adjustment. Cryogenic pneumatic control valve is single, two-seat deformation of pneumatic control valve products. It is different from normal temperature pneumatic control valve is used on the long neck type bonnet, makes the packing work at room temperature. Apply to - 60 ~ - 250 ℃ low temperature of the medium under strong condition, Such as liquid oxygen, liquid nitrogen, etc. ) The regulation. In order to ensure the accuracy, it must be with the valve locator. Cryogenic pneumatic control valve is cryogenic occasion use pneumatic - valve cryogenic pneumatic control valve is a kind of low temperature, cryogenic circumstance using pneumatic control valve. The long neck cover insulation, with many spring actuator, with the overall structure is compact, light weight, good stability, etc. Body structure of precision casting Angle, materials for aluminum alloy, with good low temperature resistance. Bellows seal to ensure the pneumatic control valve in the occasion where it in low temperature. Therefore widely used in metallurgy, cryogenic air separation, oxygen, petroleum, chemical industry, and cryogenic circumstance. Special used for precise control of low temperature gas, fluid ( Such as liquid oxygen, liquid argon, etc. ) The process parameters in a given constant value.