Williams Controls 112229 Parking Brake Control Valve

WM325 panel mounted valves are used as parking break controls in pre-FMVSS-121 air brake systems in both on and off highway applications. They are normally closed, three-way valves with pull-to-open, push-to-close knob action. A minimum supply pressure of 35 PSI is required before the WM325 can be manually operated. As long as pressure at the WM325's inlet exceeds 35 PSI and the valve is actuated, an integral check valve maintains outlet pressure at peak supply level. If inlet pressure falls below 35 PSI, the WM325 automatically deactivates and exhaustes downstream pressure to apply the spring brakes.

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