My question mainly pertains to Electric Motor-driven Motor Operated Valve Actuators.
This Site Might Help You. RE: How does an electric motor operated valve (MOV) actuator work? My question mainly pertains to Electric Motor-driven Motor Operated Valve Actuators.
The motor drives a gear operator on the valve and is limited in the degree to which it operates by a set of limit switches so it doesn't over run or over torqued the shaft. This arrangement typically also has another set of limit switches that indicate the open or closed position so the person controlling the valve will know its position. This type of operator is typically used on ball, butterfly or plug valves but can be used on gate valves.
It's been a few years, and I think it depends on the size of the valve, but: I think there is usually an electric motor, maybe 1HP or less, connected to gears and a valve actuator which might actually move a valve stem. Limit Switches (LS) usually stop the motor at the ends of travel, and provide signals to outside control systems. So maybe somebody somewhere pushes a button to start the motor, and it runs until the limit switch opens the circuit and stops the motor. To move the valve the other way, they reverse the motor.
a MOV consist of electrical motor, actuator and valve. the motor is driven by electric and its shaft is coupled to valve; therefore rotating motor shaft develop forward or backward movement of the valve thru gear mechanism. The actuator is controlling the ON or OFF, rotate to LEFT or RIGHT of the electrical motor; the actuator can be set base on process control (i.e level, flow, pressure etc). when rotating of the motor is controlled, so it does the valve opening.
