First, electric valves are usually composed of electric actuators and valves. Electric valve uses electric energy as power to drive the valve through the electric actuator to achieve the valve switching action. Thus to achieve the purpose of switching the pipeline medium.

Solenoid valve is a type of electric valve; Is to use the magnetic field generated by the electromagnetic coil to pull the valve spool, thereby changing the valve body on and off, the coil power off, the valve spool depends on the spring pressure back. For liquid, gas and wind system pipeline medium flow analog regulation, is AO control. In the control of large valves and wind systems, electric valves can also be used to do two-position switch control.

Second, electric valve operation precautions
1. When starting, confirm that the clutch handle is in the corresponding position.
2. If the electric valve is controlled in the control room, set the transfer switch to a large REMOTE position, and then control the switch of the electric valve through the SCADA system.
3, if the manual control, the transfer switch in the LOCAL position, the local operation of the electric valve switch, the electric valve opened or closed in place when it will automatically stop working, and finally the operation of the transfer switch to the middle position.
4, the use of field operation valve, should monitor the valve opening and closing instructions and valve stem operation, valve opening and closing degree to meet the requirements.
5. When the valve is fully closed by field operation, the electric valve should be stopped before the valve is closed in place, and the valve should be closed in place by micro-motion.
6, for the valve after the stroke and super torque controller setting, the first time to fully open or fully close the valve, should pay attention to monitor its control of the stroke, such as the valve switch to the position does not stop, should immediately manual emergency shutdown.
7, in the process of opening and closing the valve, when the signal indicator is found to be wrong and the valve has abnormal sound, it should be stopped in time for inspection.
8. The power supply of the electric valve should be turned off after successful operation.
9. When operating multiple valves at the same time, attention should be paid to the operation sequence and meet the production process requirements.

Third, the operation of the electric valve, all kinds of valves should be complete and intact. The flange thread and the bolt on the support are indispensable, the thread should be intact, and no loosening is allowed. If the tightening nut on the handwheel is found to be loose, it should be tightened in time to avoid wearing the connection or losing the handwheel and nameplate. If the hand wheel is lost, it is not allowed to use a adjustable wrench instead, and it should be matched in time. Packing caps are not allowed to skew or have no preload clearance. For electric valves that are easily contaminated by dirt such as rain, snow, dust, wind and sand, the valve stem should be installed with a protective cover. The scale on the electric valve should be kept complete, accurate and clear. The seal, cap and pneumatic accessories of the electric valve should be complete and intact. The thermal insulation jacket should be free of dents and cracks. Do not knock, stand or support heavy objects on electric valves in operation; In particular, non-metallic electric valves and cast iron electric valves should be prohibited.