Integral Bypass Force-Balance Pneumatic Valve Positioner with Field-Reversible Action
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Product Overview The Fisher 3720 Pneumatic Valve Positioner is a field-proven, force-balance instrument designed to position diaphragm-actuated sliding-stem control valves using a pneumatic input signal. It receives a 3-15 psi (0.2-1.0 bar) or split-range pneumatic signal from a controller and delivers a proportional output pressure to the actuator, ensuring accurate and repeatable valve positioning. The 3720 uses a nozzle/flapper and relay mechanism that provides fast
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