The V-400 and V-500 Series Pneumatic Valve Actuators are designed to accurately position valve modulating plugs in larger chilled water, hot water, and steam control valves in response to a pneumatic signal from a controller. A valve positioner can be ordered separately for use in applications where sequential operation is desired or additional positioning power is necessary. These actuators have a molded, synthetic rubber reinforded diaphragm contained in a sturdy metal housing that protects against dirt and damage
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