Electric Actuator Valve Types

Position switches are utilized to indicate the open and closed position of the valve.

Electric actuator valve types.

Figure 2 typical electric motor valve actuator. Pneumatic actuators provide for automatic or semi automatic valve operation. Electric motors can be used to open close and position a valve manually automatically or semi automatically. Linear electric valve actuators are used with gate globe diaphragm pinch and angle valves that feature a sliding stem that opens or closes the valve.

There are two main types of actuators one for each of the two main types of valves that require them. More information on rotary and linear motion valves can be found on engineering360 s valve types page. Typically a declutching mechanism and hand wheel are included so that the valve can be operated manually should a power failure occur. This power source can be electric pneumatic compressed air or hydraulic the flow of oil.

They work by translating an instrument air signal into valve stem motion by air pressure acting on a diaphragm or piston connected to the stem. To protect the valve the torque sensing mechanism of the actuator turns off the electric motor when a safe torque level is exceeded. They are rotary and linear. The motor operates in both directions and drives the valve stem by means of gear couplings.