Modulator relay valve assembly and method

Details Modulator relay valve assembly and method Modulator relay valve assembly and method

B - Operations, Transporting

60

T

B60T 15/36 (2006.01) B60T 8/36 (2006.01)

Patent

CA 2391225

A modulator relay valve assembly for selectively controlling brake application to an associated brake chamber is provided. The modulator relay valve assembly comprises a housing having a supply port, a delivery port, a control port, and an exhaust port. A piston is received in the housing defining a control volume in communication with the control port and is movable to control communication among the supply, delivery, and exhaust ports. A quick release valve with a direct pas age to atmosphere communicates with the control volume, allowing contaminants to be expelled form the control volume during service and ABS braking. The quick release valve is biased toward an open position allowing communication from a control volume to atmosphere during service brake and ABS brake applications to decrease a pressure exerted by the control volume on the piston.

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