pneumatic diaphragm regulating valves in the running, there will be various kinds of process medium flows through the automatic valve, including process raw block material, steam flushing to sand, stone, iron, tin, and the instrument installation and technical improvement of welding, flame cutting off into the pipe welding slag, etc. These foreign bodies and choke material, for the normal work and had a greater influence on the accuracy of automatic valve, as time passes, will form the jams, jammed. Field generally take the following measures: 1, the card plug ( 1) Cleaning method. This method is suitable for use in the process when parking overhaul. Need to remove the regulator clean, remove dirt and foreign material. It is worth noting that the disassembly, be sure to turn off the compressed air, lest cause unnecessary damage. Instrument of gasket and seal also had better change at the same time. ( 2) Using the method of scour. This method used more at the scene. When the valve plug, usually is first inquiry process or OCC, director of the personnel, whether can switch valve automatically, repeatedly using existing technology medium flowing pressure to achieve the goal of flushing. Such as working condition of the existing medium and doesn't fit, can also in the case of a condition is met, with foreign steam or have certain pressure water to wash. Rinse, pay attention to the valve opening control in the appropriate position. ( 3) The installed filter. In the process piping installed filters is also a common measure of instrument automatic valve maintenance. Especially on craft is very important and diameter smaller regulator, use this method can ensure the automatic valve opening is normal, stable condition. 2, control valve seat leakage into smaller, iron slag and hard objects within a long stay cannot eduction, the valve gasket, sealing ring and valve core will get different degrees of damage effect control valve leakage ability. Especially to the reaction kettle hydrogen production technology of high pressure pipeline automatic valve, a little bit of damage even scratches will cause leakage, affect the safety in production. ( 1) Grinding. Select the corresponding coarse sand and fine sand on automatic valve Industrial Valves pad and valve core grinding, improve valve pad and the smoothness of the sealing contact surface of the valve core and the meshing. If the regulator is used in high pressure system, it need to suppress after test of control valve, and normal use. ( 2) Enhance actuator seal. By this method can guarantee the closing of the valve, sealing is reliable. Usually adopt mobile spring's scope of work, choose big power source selection of actuators and small stiffness of the spring. Schedule 3, leakage control valve packing replacement, automatic valve locking device of screw loosening due to vibration, including school just repair the valve base after the screw didn't tight or uneven force can cause valve leakage. Can adopt the following measures: ( 1) Replacement of new packing to enhance stem seal, also can choose sealing grease on the valve stem seal. ( 2) Can use high sealing metal winding gasket appropriately or ptfe packing, especially the steam regulating valve, must choose metal winding gasket with graphite. ( 3) The lens gasket to seal the upper and lower cover, if the seat and body is flat, suggest choose lens gasket seal, effect is remarkable. 4, regulating valve control some of the reasons for control instability, such as the selection of design is unreasonable, the valve diameter chosen too small or too large; OCC process operators use undeserved, instrument and process parameter Settings are unreasonable; No debug configuration error; Process of medium pressure, flow instability, etc. ; Sometimes these factors lead to the result of joint action. Often take the following methods: ( 1) Choose the appropriate valve size. If considering the economy and time, also can consider to choose the appropriate variable diameter to decrease or increase the regulator and process piping connection pipe diameter.

( 2) To reasonable set of PID value, and through practical test and operation of qualified after put into use.

( 3) Strengthen the stiffness regulator mechanism, to alleviate the vibration of the regulating valve.

( 4) Adjust the regulator is the result of the type, to avoid resonance.

keywords: pneumatic diaphragm regulating valve pneumatic diaphragm regulating valves fault form and the solution
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