Electric Actuator Gate Valve

Electric Actuator Gate Valve

The motion valves can be fitted with various types of actuator, the popular choices are electric actuator gate valve, pneumatic gate valve and hydraulic gate valeve. Electric actuators are the most commonlu used power source. They can be solenoid or motor operated. They usually have the least total installed cost because the source of electricity is generally available throughout a facility and the wiring and control instrumentation is relatively simple. Electric motors do not stop instantaneously, but coast to a stop. The use of a solenoid brake to prevent the motor from overtightening the closure member should be ascertained from the manufacturer of the valve on which the actuator is installed. When the stem screw mechanism is retained, an electric motor can operate the valve through a gearbox. Electric actuators for wedge gate valves, some globe valves and needle valves should have a ‘hammer-blow’ effect bulit in to ensure the valve disengages from the seat immediately. Motor operators should be limited to moderate cycling functions. They are not recommended for service where severe cycling is necessary. Generally, 2-in(50-mm) valves do not have sufficient strength for a standard electric motor actuator. Electric motor actuators have been extensivelu tested in seismic and harsh ambient environments.