Actuators are mechanical device that uses an energy source to operate a valve. The energy source can be pneumatic, electric, or hydraulic. The main types of valve actuators are linear, rotary and manual.
At ESI Technologies Group we supply valve actuators / actuated valves to suit clients’ specifications. We offer special engineered solutions for all applications. Contact us to discuss your specific requirements.
We have a full-service department that can build your actuation valves and assemblies to meet your process requirements.
For rotary pneumatic actuation, the two main types used on ball, butterfly and plug valves are Rack & pinion and scotch yoke. They work similarly by converting the linear motion of a piston in a cylinder into the rotational motion of the stem drive. Both are available in single acting or double acting.
For linear pneumatic actuators used on valves such as gate and globe valves, the air is used to push the rising stem up and down. Common linear actuators come in Diaphragm and Cylinder styles.
Single-acting actuators (Spring return actuators) use compressed air to move the piston in one direction and a spring to move it back when the air is stopped and allowed to vent.
Double-acting actuators require air to move the piston in either direction. A solenoid valve can be used to control the flow of air into the actuator.
Fail-safe in actuation means if the air supply to the actuator is lost or the power supply to the solenoid fails on a single-acting actuator, the valve will travel to the safe position (Fail Safe) using the force of the springs. This can be either open or closed, whichever is the safer / preferred outcome.
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