Working Principle of Diaphragm Valves

The diaphragm between the actuator and valve body hermetically isolates the fluid from the actuator. The valves are maintenance-free and extremely robust and can be retrofitted with a comprehensive range of accessories, e.g. electrical position feedback, stroke limitation or manual override.

Figure shows unactuated and actuated position of diaphragm valves.

Figure : Diaphragm valve: unactuated position, actuated position

Closed position: When de-energized, the valve is closed by spring action

Open position: If the actuator is pressurized by the control pressure, it simultaneously lifts the control piston and the valve spindle to open the valve.

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