A valve arrangement (10; 20; 30) is disclosed that is operable to switch between a bistable valve behavior and a relay valve behavior to control a parking brake. The valve arrangement includes a housing (100) with a supply pressure inlet (102), a service brake control inlet (104) to provide a control pressure, a pressure outlet (106), and an exhaust port (108). The valve arrangement further includes a first piston (110) and a second piston (120) both movable along a same direction in the housing (100) to define a first chamber (210) communicating with the service brake control inlet (104), a second chamber (220) between the first piston (110) and the second piston (120), and third chamber (230) communicating with the pressure outlet (106) and with a controllable connection (235) to the supply pressure inlet (102), wherein upon the control pressure the second piston (120) is configured to move together with the first piston (110) to connect the pressure outlet (106) with the exhaust port (108) or with the supply pressure inlet (102). The valve arrangement includes finally a throttle unit (300) adapted depending on the control pressure to connect the second chamber (220) with the third chamber (230) to enable the bistable valve behavior or to disconnect the second chamber (220) from the third chamber (230) to enable the relay valve behavior.
VALVE ARRANGEMENT
VENTILANORDNUNG
AGENCEMENT DE SOUPAPE
2022-12-07
Patent
Electronic Resource
English
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |