Introduction to electric valve 
 Pneumatic valve responsive, safe and reliable plant control requirements designed to set the air station for pneumatic instrument control elements. Electric power. And control the flow device. 
 Electric valve electric actuator control valves, in order to achieve the valve on and off. Can be divided into upper and lower part of the upper part of the electric actuator, the lower half is divided into the valve. 
 Electric valve operation principle 
 The electric valves are usually connected by the electric actuator bodies and valve after installation and commissioning of electric valve. The use of electric energy of electric valve connected to the electric actuator as a driving force to drive the valve, the valve switch, adjust the action. Switch or adjust the purpose to achieve the right media channels. 
 The solenoid valve is an electric valve types; magnetic field generated by electromagnetic coil to pull the spool, thus changing the body off the coil power, the spool will depend on the pressure of the spring return. 
 The use of electric valve 
 Electric valve: for liquid gas and wind system, the analog of the pipeline medium flow regulator is AI-controlled. Control valve and wind systems can also do two switches control the electric valve. 
 The method of operation of the electric valve 
 Preparation before an operation 
 1.1 The operation of the valve, should carefully read the operating instructions. 
 1.2 operation must be clear before the flow of gas should be noted that the check valve opening and closing flag. 
 1.3 check the appearance of the electric valve, look at the electric valve is damp, the moisture to make the drying process; If you find that there are other questions to be not allowed to take the trouble free operation. 
 1.4 to disable more than 3 months of electric devices, before the start should check the clutch, make sure the handle in the manual position, and then check the motor insulation, steering and electrical wiring. 
 2 electric valves Handling Precautions 
 2.1 start, make sure the clutch handle in the appropriate location 
 2.2 If it is in the control room to control the electric valve, fighting big change-over switch REMOTE position, and then through the SCADA system to control the switch of the electric valve. 
 2.3 If the manual control, the transfer switch to play in the LOCAL position, the local operating switch of the electric valve, electric valve opening in place or when in place are that it will automatically stop working, and finally running into the switch to the middle position. 
 2.4 on-site operation of the valve should be monitoring the valve opening and closing instructions and stem the operation, the valve opening and closing degrees to meet the requirements.