Williams 112371 WM338P Normally Open Relay Valve

The WM338 series valves are normally open, three-way relay valves that close and exhaust with sufficient control pressure. The WM338 series includes non-compensating relay valves and compensating pressure-limiting valves. The compensating models deliver as output pressure proportional to the control signal received. The control pressure required to close the WM338 valves varies with the different models in the series. Some models are equipped with an adjustment that changes the control pressure at which the valve closes; these models are factory pre-adjusted to close at a specific valve. The non-adjustable models will close at a fixed control pressure.

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