Williams Controls WM-521-A1 Activeair Controller

WM521 series Activair controllers are 4 way precision regulating valves which are factory assembled into banks of up to 5 units. Combined with the WM523 actuator, they comprise the customized Activair System, designed for specific hydraulic valves. For plumbing convenience, WM521 models with two or more valve units have a single inlet and a common exhaust port. WM521 control levers spring return to the neutral position when released and are designed with push-to-connect port fittings. Special models are available for field replacement of WM501 units.

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