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What is the difference between direct- and servo-operated solenoid valves?

April 26, 2017difference solenoid valves

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What is the difference between direct- and servo-operated solenoid valves?

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Physical differences: Direct-operated valves have an armature that controls the fluid. Servo-operated valves have an armature that controls the pilot system that controls a diaphragm or a piston. Differential pressure differences: Servo-operated valves require a minimum differential pressure to keep the valve open, whilst direct-operated valves do not require a minimum differential pressure to operate.