C PRODUCT DESCRIPTION DESCRIPTJON The WM762 is a panel-mounted three-way control valve with push-to-open# pull-to-exhaust action. The valve may be opened or closed manually, but it will exhaust automatically if the supply pressure drops belowthe minimum holding pressure. A black band on the knob indicates whether valve is actuated. OPERATION A normally closed, spring-returned valve, the WM762 requires a minimum supply pressure of 35-45 PSI (241,3-310,3 kPa) to remain in the open position after manual actuation. When the knob is pushed in, air flows from the supply port to the outlet port. When the knob is manually pulled out or the supply pressure drops below 35-45 PSI (241,3-310,3 kPa), the supply port closes, and any pressure at the outlet port is released through the exhaust port. Thus, when the supply pressure drops below the necessary level, the valve exhausts and the spring brakes are applied automatically. APPLICATIONS The WM762 parking brake control valve is engineered for air brake systems of heavy duty truck and tractor-trailer combinations. The valve is used to control the parking and automatic emergency functions of the spring brakes. The WM762 control valve complies with FMVSS-121. THREE-WAY CONTROL VALVE FUNCTIONAL DIAGRAM PUSH o

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