Williams Pedal Valve

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Williams Pedal Valve
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Williams Pedal Valve

Description: The WM453 Series are pneumatic throttle pedal valves. The WM453 series are designed for industrial and vehicular applications. The throttle pedal valve is directly used to control the air pressure supply to the throttle control cylinder. 

Operation: As the operator depresses the treadle, the control valve opens to regulate the delivery of air pressure against the force of an internal spring. When the treadle is released, the pressure at the outlet port is discharged through the exhaust port.

Note: Not approved for FMVSS-124 applications


Part Number Stock Code Port Size Max Supply Pressure Operating Temperature Regulated Output Range Max Output Treadle Length Port Orientation
WM453M 15233 1/4" NPT 150 psi -40F to 200F 0 - 60/70 psi 70 psi 11.35" Toward Heel
WM453C  15232 1/4" NPT  150 psi -40F to 200F 0 - 120/140 psi

140 psi

11.35" Toward Heel


Description: Commonly used in pneumatic braking systems, the WM472 series treadle valves are three-way, compensating pressure regulators. Each unit consists of a valve sub-assembly that responds to movement of the pedal. The WM472 models are designed with various treadle-to-mounting surface angles. 

Operation: As the operator depresses the pedal, the exhaust port closes and the supply port opens to allow delivery. The valve sub-assembly modulates the output in relation to the position of the pedal. When the pedal is released, the outlet pressure is discharged through an exhaust port located in the valve bottom.

Application: The WM472 series valves are commonly used in industrial and vehicular applications where a three-way, compensating treadle valve is required. These treadle valves are primarily installed in a relay-type brake systems. Mounted through the floor of the operator's compartment, the valve sub-assembly can be rotated on 900 increments for plumbing convenience.

Part Number Stock Code Port Size Max Supply Pressure Operating Temperature Flow Rating Height Angle
WM472A 15240 1/2" NPT 150 psi -20F to 200F 160 SCFM @ 100 psi 7.5" 35 Deg
WM472E 15243 1/2" NPT 150 psi -20F to 200F 160 SCFM @ 100 psi No Treadle No Treadle



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