How to control butterfly valve by PLC

1。 Plc controls the pneumatic butterfly valve, and then controls the butterfly valve through electrical signals (generally, an intermediate relay is added, and the coil of the intermediate relay in the PLC control cabinet will also be used below).

2。 PLC controls electric butterfly valve, that is, PLC program controls electricity. If the control valve is specific, it can use electric actuators. There is a motor in the electric actuator, and the butterfly valve is controlled by controlling the rotation of the motor. There are motor torque protection and butterfly valve opening feedback links in the electric actuator, and its wiring can be connected to plc, which can realize remote control. Opening display (4-20MA) is input into plc, and then output to the man-machine screen of remote console computer, which is beneficial to adjustment. Simply put, the opening is 0% when fully closed, 50% when half closed, and 100% when fully opened, corresponding to butterfly valves.