Electric pneumatic control valve leakage reason and solution

Electric pneumatic control valve leakage causes and solution of electric 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 electric pneumatic regulator and solutions, 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, electric pneumatic control valve manufacturing quality caused by the leak valve manufacturer in the process of production of material, 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, cause of leakage of electric pneumatic control valves. Solution: reprocessed seal face. 4, electric pneumatic regulator control part affect valve leakage electric pneumatic control valve of the traditional control mode 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 electric pneumatic - valve leakage. Solution: adjust the limit again. Increase pneumatic - valve throttle clearance method such as solid particles in the medium or washed off in pipe welding slag and rust due to pass the throttle mouth such as congestion, jam, such as fault, can convert the throttle gap big throttling parts & ndash; Throttling area of a window, open the valve core and the sleeve, rather than the circumference of a circle because of the throttling area of concentration distribution, fault can easily be ruled out. If you are single, two-seat valves can change the plunger type valve core to V mouth valve core, or into a sleeve valve, etc. Such as have a pneumatic control valve in a chemical plant often stuck, recommend to switch to the sleeve valve, problem be solved immediately.