Electric Actuator Valve Types

Linear electric valve actuators are well suited for operating in tight tolerances.

Electric actuator valve types.

Pneumatic actuators provide for automatic or semi automatic valve operation. There are two main types of actuators one for each of the two main types of valves that require them. Selection of the best actuator type for any application is dependent on many factors including. They are rotary and linear.

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. The motor operates in both directions and drives the valve stem by means of gear couplings. Electric actuators include electric motors and solenoid actuated valves. Figure 2 typical electric motor valve actuator.

Typically a declutching mechanism and hand wheel are included so that the valve can be operated manually should a power failure occur. Electric motors can be used to open close and position a valve manually automatically or semi automatically. Position switches are utilized to indicate the open and closed position of the valve. 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.