Electric 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 electric 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 Industrial Valves. 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, electric 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 in electric control valve leakage. Solution: reprocessed seal face. Part 4, electric control valve control valve leakage of electric regulator 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 Industrial Valves positioning, spring fatigue, thermal expansion coefficient of inhomogeneous objective factors, such as electric control valve leakage. Solution: adjust the limit again. 5, electric regulator debugging problems caused by the leakage because of the influence of processing and assembly process, electric regulator are widespread manually locked after electric can't open the phenomenon, such as motion through the upper and lower limit switch position of the electric control valve stroke adjustment, electric regulating valve in closed lax or valve open exhibition is not ideal; The electric control 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, the electric control valve when debugging manual electric regulator shake, shake a circle towards the direction to open again, set the lower limit of the electric door switch position, and then puts the electric control valve to full open position limit switch position, won't appear such electric regulator manually locked after electric wouldn't open phenomenon, to make the electric door open and close operation freely, but virtually caused the electric gate leakage. Even electric regulator adjusting ideal, because of the limit switch action position is relatively fixed, in the operation of the valve control the media in the Industrial Valves of scour, wear, also can cause leakage phenomenon caused by valve closing is lax. Solution: adjust the limit again. 6, selection error caused by valve cavitation corrosion of electric control valve 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 electric door has different specific technical requirements, according to system process to choose reasonable electric regulating valve is very important. Solution: process improvement, choose multi-stage decompression or sleeve regulator. 7, medium scour, electric regulator aging caused by the leakage of electric 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, electric regulator slants big, will appear the phenomenon of electric control valve closed lax, causing electric control valve leakage quantity is big, with the passage of time, the electric control valve leakage phenomenon will be more and more serious. Solution: adjust the actuators, and regular maintenance, calibration.
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