Abstract: A valve assembly for use in an air brake system is provided. The assembly includes a modulator housing, a valve assembly, and a clamp for holding the valve assembly in an operative position on the modulator housing. One leg of the clamp is fit over retaining bosses on the housing. Another leg of the clamp is bent or advanced toward a retainer that cooperates with a retaining opening on the leg to maintain the clamp in a tensioned state and secure the valve assembly to the modulator housing.

Abstract: 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 passage 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.

Abstract: 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 passage 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.

Abstract: A valve assembly for use in an air brake system is provided. The assembly includes a modulator housing, a valve assembly, and a clamp for holding the valve assembly in an operative position on the modulator housing. One leg of the clamp is fit over retaining bosses on the housing. Another leg of the clamp is bent or advanced toward a retainer that cooperates with a retaining opening on the leg to maintain the clamp in a tensioned state and secure the valve assembly to the modulator housing.