Pneumatic control valve with its advantages of high control precision, easy installation and debugging in a variety of industrial control system has been more and more widely used. But, in use process, there are also some problems with the field instruments, is the valve leakage problem. Here we will explore the common causes of leakage of pneumatic control valve and solution, hoping to on-site maintenance personnel to the factory have a little help. 1, the executing agency zero set is not accurate, not reached the seated position of the valve. Adjust way: 1) Closing the valve manually ( Must be confirmed completely shut down) ; 2) Reoccupy force close the valve manually, but use a strength twist fixed shall prevail; 3) Turn back again, Open valve direction) Half a circle; 4) And then adjust the limit. 2, the valves are pushed down closed type, thrust of the actuator is not big enough, in the absence of pressure debugging is easy to achieve, fitted with thrust, cannot overcome liquid upward thrust, so does not reach the designated position. Solution: replace the big thrust actuator, or the type to balance valve core to reduce the unbalanced force of medium. 3, pneumatic control valve manufacturing quality caused by the leak valve manufacturers in the process of production of materials, processing technology and assembly process control valve is lax, the sealing surface grinding is unqualified, the pitting, products are not completely eliminate defects such as trachoma, caused the pneumatic - valve leakage. Solution: reprocessed seal face. In part 4, pneumatic control valve control valve leakage control valve of the traditional control method is through the valve and mechanical limit switch, a torque switch control mode, because the control element is affected by environmental temperature, pressure, humidity, causing the valve positioning, spring fatigue, thermal expansion coefficient of inhomogeneous objective factors, such as leakage of pneumatic control valve. Solution: adjust the limit again. 5, pneumatic control valve debugging problems caused by the leakage because of the influence of processing and assembly process, pneumatic control valve is widespread manually locked after pneumatic wouldn't open phenomenon, such as motion through the upper and lower limit switch position of the pneumatic control valve stroke adjustment, is a pneumatic - valve or valve closed lax open exhibition is not ideal; The pneumatic - valve stroke adjustment a few bigger, the cause of torque switch protection action; If the adjustment of torque switch action value, reduction drive crashed in institutions or damaged valve, even to the motor burned accident. In order to solve this problem, usually, pneumatic control valve when debugging manual pneumatic control valve will shake, shake a circle towards the direction to open again, set the lower limit of pneumatic door switch position, and then puts the pneumatic - valve to full open position limit switch position, won't appear so pneumatic - valve manually locked after the phenomenon of pneumatic wouldn't open, to make the pneumatic door open and close operation freely, but virtually caused a pneumatic gate leakage. Even if the ideal pneumatic - valve adjustment, because of the limit switch action position is relatively fixed, in the operation of the valve control the media in the valve of scour, wear, can also cause leakage phenomenon caused by valve closing is lax. Solution: adjust the limit again. 6, selection error caused by valve cavitation corrosion of pneumatic control Industrial Valves leakage cavitation related to pressure difference, when the actual pressure differential valve delta P is greater than produce cavitation critical pressure differential delta Pc, will produce cavitation, in the process of cavitation bubbles burst release enormous energy, the valve seat, valve core has great damage, the throttling components such as general valve under the condition of cavitation run no more than three months, or even shorter time, the valves are subjected to severe cavitation corrosion, the high seat leakage can reach more than 30% of the rated flow, this is irreparable, therefore, different USES pneumatic door has different specific technical requirements, according to system process to choose reasonable pneumatic control valve is very important. Solution: process improvement, choose multi-stage decompression or sleeve regulator. 7, medium scour, pneumatic control valve of aging caused by the leakage in dynamic regulator to adjust after a certain time after the operation, due to the cavitation of the valve and the medium of scour, valve core and valve seat wear, internal components aging causes, pneumatic control valve stroke will appear larger, pneumatic control valve clearance is lax phenomenon, caused by pneumatic - Industrial Valves leakage quantity is big, with the passage of time, the pneumatic control valve leakage phenomenon will be more and more serious. Solution: adjust the actuators, and regular maintenance, calibration.
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