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An air-operated valve is a type of power operated valve that uses air pressure against a piston or diaphragm to produce linear or circular movement to operate a valve.
Types are 2-way, 3-way and 4-way. The 2 way air-operated valves can be either normally closed or normally opened.

https://en.wikipedia.org/wiki/Air-operated_valve

Air-Operated Valve

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