Pneumatic control valve is with compressed air as power source, with cylinder as actuator, and by means of electric valve positioner, converters, solenoid valve, a valve to drive the valve such as attachment, realize the switch quantity or proportion type adjustment, industrial automation control system receives the control signal to complete conditioning pipeline medium: flow, pressure, temperature and other process parameters. Pneumatic control valve is to control the characteristics of simple, quick response, and intrinsically safe, do not need another explosion protection measures. So, what are the principle of pneumatic control valve installation? ( 1) Pneumatic control valve installation position, the request has the certain high valve from ground up, down to have a certain space, degrees, and the valve of the upper and lower should have a certain space, disassembling and repairing for valve. Disassembling and repairing. For regulating valve, equipped with pneumatic valve positioner and a handwheel must ensure that the operation, observation and easy to adjust. ( 2) Regulator shall be installed in horizontal pipe runs, and pipeline hang them up and down, generally to be supported under the valve, ensure stable and reliable. Straight, typically under the valve to support, to ensure stable and reliable. For special occasions, in special cases, need to be level regulating Industrial Valves installed in vertical pipe runs, also should be the regulator for support ( Road, also should be the regulator for support ( Except for small diameter regulator) 。 When installation, to avoid to bring additional stress to the regulating valve,) 。 ( 3) Working environment temperature regulator must be ( - 30 ~ + 60) Working environment temperature regulator must be ( - 30 ~ 60) ( - 30 95% relative humidity is not more than 95%. ℃, relative humidity is not more than 95%. ( 4) Position before and after regulating valve should have straight pipe, valve position before and after the straight pipe before and after the regulator should be straight pipe, the length is not less than 10 times the pipe diameter ( 10 d) , 10 times the pipe diameter) To avoid length not less than 10 times the pipe diameter ( 10 d) To avoid the straight pipe is too short and affect the flow characteristic. ( 5) The calibre of the valve and process piping is not at the same time, reducing pipe connection should be adopted. In small diameter when regulator is installed, can be threaded connections. Pipe connection. In small diameter when regulator is installed, can be threaded connections. Flow direction arrow on the valve body shall be consistent with the direction of flow. Flow direction arrow on the valve body shall be consistent with the direction of flow. To set up the by-pass pipe. ( 6) To set up the by-pass pipe. Purpose is to facilitate the switch or a manual operation, but without stopping the regulator for maintenance. But without parking for regulating valve for maintenance. ( 7) Regulator to thoroughly clean the pipe before installation of foreign body, such as dirt, slag, etc.
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