What are the pneumatic principle of pneumatic control valve installation

Pneumatic pneumatic - valve installation position, the request has the certain height from ground, valve up to leave a certain space, disassembling and repairing for valve. For a pneumatic control valve, pneumatic valve positioner and a handwheel must ensure that the operation, observation and easy to adjust. Pneumatic control valve should be installed in horizontal pipe runs with them up and down and the vertical pipe, typically under the valve to support, to ensure stable and reliable. For special occasions, it is necessary to level of pneumatic control valve installed on the vertical pipe, pneumatic control valve should be also supported ( Except for small pneumatic - valve) 。 When installation, should avoid to bring additional stress to the pneumatic control valve) 。 Pneumatic control valve working environment temperature in ( - 30 ~ + 60) Relative humidity is not more than 95% 95%, the relative humidity is not greater than 95%. Pneumatic control valve position should be straight pipe before and after, the length is not less than 10 times the pipe diameter ( 10 d) To avoid the straight pipe is too short and affect the flow characteristic. The calibre of the pneumatic control valve and process piping is not at the same time, reducing pipe connection should be adopted. In small pneumatic - valve installation, threaded connection is used. Flow direction arrow on the valve body shall be consistent with the direction of flow. To set up the by-pass pipe. Purpose is to facilitate switching or manual operation, can not stop in case of pneumatic control valve for maintenance. Pneumatic control valve before installation to thoroughly remove foreign bodies in the piping, such as dirt, slag, etc.