Electric adjustment processing method of pneumatic valve closing is lax

electric regulating pneumatic valve is to regulate the medium flow of special pneumatic valves, pneumatic valves according to the measured parameters ( Such as temperature, pressure, flow, etc. , at a constant parameter being measured, for the purpose of automatic control of pneumatic valve opening. Because electric adjustment precision of pneumatic valve adjustment function, make pneumatic valve leakage in soft rib of such products.

the following introduced several regulating pneumatic valve leakage treatment.

and actuator zero setting is not accurate, not reached the seated position of pneumatic valve.

adjust way:

manual (closing the pneumatic valve Must be confirmed fully closed;

to forcibly close the pneumatic valve manually, but use a strength twist fixed shall prevail;

turn back again, Open the pneumatic valve direction half a circle;

and then adjust the limit.

and pneumatic valves are pushed down closed type, the 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 instead of the balance type pneumatic valve core to reduce the unbalanced force of medium.

, electric adjustment in pneumatic valve manufacturing quality caused by leakage, pneumatic valve manufacturers in the process of production of pneumatic valve materials, processing technology and assembly process control is lax, the sealing surface grinding is unqualified, the pitting, products are not completely eliminate defects such as trachoma, caused the electric regulating pneumatic valve leakage.

solution: reprocessed seal face.

pneumatic valves, electric control part impact of leakage of pneumatic valve, electric control pneumatic valve of the traditional control method is through the pneumatic valve machinery, limit switch, a torque switch control mode, because the control element is affected by environmental temperature, pressure, humidity, causing pneumatic valve positioning, spring fatigue, thermal expansion coefficient of inhomogeneous objective factors, such as electric regulating pneumatic valve leakage.

solution: to adjust the limit.

, electric adjustment in pneumatic valve debugging problems caused by leakage, affected by the processing, the assembly process is common electric regulating pneumatic valve manually locked after electric wouldn't open. Such as motion through the upper and lower limit switch position adjust electric pneumatic valve stroke adjustment smaller, appear electric regulating pneumatic valve clearance is lax or pneumatic valve open exhibition is not ideal; Adjust electric pneumatic valve stroke adjustment is bigger, the cause of torque switch protection action; If the adjustment of torque switch action value, reduction drive crashed in institutions or pneumatic valve, crashed to motor burned even accidents. In order to solve this problem, usually, the electric control pneumatic valve commissioning, manual electric regulating pneumatic valve swing open direction again shake a circle, set the lower limit of the electric door switch position, then regulate electric pneumatic valve to open to the full open position limit switch position, won't appear such electric pneumatic valve 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 adjust the ideal of pneumatic valve adjustment, because of the limit switch action position is relatively fixed, pneumatic control valve of the medium in the operation of pneumatic valve constantly scour, wear, also causes the pneumatic valve closed lax and cause of leakage phenomenon.

solution: to adjust the limit.

and selection error caused by the cavitation corrosion of the pneumatic valve electric adjust the internal leakage of pneumatic valve, cavitation is related to pressure difference, when the actual differential pressure delta P is greater than the pneumatic valve produce cavitation critical pressure differential delta Pc, produce cavitation and cavitation bubble burst in the process of releasing vast amounts of energy, such as pneumatic valve seat, pneumatic valve core throttling element generated enormous damage, the general pneumatic valve under the condition of cavitation run no more than three months, or even shorter time, the pneumatic valves are subjected to severe cavitation corrosion, the pneumatic valve seat leakage up to the rated flow % above, this is irreparable, therefore, different USES of electropneumatic valve has different specific technical requirements, according to system process to choose reasonable electric regulating pneumatic valve is very important.

solution: process improvement, selection of multi-stage decompression or regulate pneumatic valve socket.

, medium scour, electric regulating pneumatic valve leakage caused by aging, electric regulating pneumatic valve adjust after a certain time after operation, the pneumatic valve cavitation and medium scour, pneumatic valve core and valve seat wear, internal components aging causes, regulated electric pneumatic valve stroke will appear larger, electric regulating pneumatic valve closed lax phenomenon, caused by electric adjustment pneumatic valve leakage quantity is big, with the passage of time, the electric control pneumatic valve leakage phenomenon will be more and more serious.

solution: reset actuators, and regular maintenance and calibration.