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1. (WO2001023234) SPRING BRAKE ACTUATOR WITH INTEGRAL BIASED DOUBLE CHECK VALVE

Pub. No.:    WO/2001/023234    International Application No.:    PCT/US2000/026701
Publication Date: Apr 5, 2001 International Filing Date: Sep 28, 2000
IPC: B60T 17/08
Applicants: BENDIX COMMERCIAL VEHICLE SYSTEMS
Inventors: EBERLING, Charles, E.
AMATO, William, P.
MARSH, Andrew
Title: SPRING BRAKE ACTUATOR WITH INTEGRAL BIASED DOUBLE CHECK VALVE
Abstract:
A double check (70) valve is integrally located in a spring brake chamber to reduce plumbing associated with a pneumatic brake system. Anti-compounding is provided by virtue of a bias pressure of approximately twenty to thirty psi between a pressure chamber (52) of a service actuator (44) and an operating chamber (66) of a parking/emergency actuator (46). Likewise, vehicle roll-back is addressed since the transition from a service application to a park application assures that the service brakes are sufficiently applied until the spring brake becomes operative.