Harbin gasification plant is a use of coal gasification process pressurized gas production chemical companies, a higher level of automation in the process control, the control of the actuator quality and production conditions are closely linked, so the actuator Choice is particularly important for safety and chemical requirements of higher chemical companies, the vast majority of actuators are used pneumatic control valve. Pneumatic control valve selection generally from the following aspects to be considered: 1) According to process conditions, select the appropriate control valve structure and type. 2) According to the process object, select the appropriate flow characteristics. 3) According to the process parameters, calculate the flow coefficient, select the valve diameter. 4) According to process requirements, select materials and auxiliary devices. The following for the above 4 points to be discussed. 2 control valve structure and type Pneumatic control valve is composed of pneumatic actuators and valves of two parts, the pneumatic actuator receives the input of the gas source signal, resulting in the corresponding thrust, the push rod displacement, pushing the valve action; and the valve Refers to the valve body assembly connected with the pipeline part, which accepts the actuator push rod thrust, stem displacement change, thereby changing the valve opening, and ultimately control the fluid flow changes. Pneumatic control valve according to its stroke can be divided into two kinds of straight travel and angular travel, according to the type of structure points through the single-seat valve, direct seat valve, high pressure valve, angle valve, sleeve valve, diaphragm valve, butterfly valve, eccentric rotary valve Wait. One of the more common through-valve, single-seat valve leakage is small, but the pressure difference before and after the valve can not be too large, while the double-seat valve exactly the opposite. High-pressure valve suitable for high static pressure and high pressure differential medium measurement, but in the case of high pressure drop, the fluid flushing and cavitation serious, generally consider the spool and valve seat material, in order to improve its service life. Angular valves are available for high differential pressure, high viscosity, control of fluids containing suspended solids and particulate matter. Diaphragm valve is more suitable for strong acid, alkali and other corrosive media control. Butterfly valve for large flow, low pressure gas medium. Sleeve valve with balanced spool structure, with low noise characteristics, is one of the more widely used valves. More keyword search: Regulating valve
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