Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1997-01-28
1998-08-11
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 15, 30312215, 303128, B60T 802, B60T 836
Patent
active
057917442
ABSTRACT:
A pneumatic trainline control unit receives air from a first pneumatic trainline which it uses to charge and maintain pressure in a second pneumatic trainline. It also provides brake control pressure to a universal pneumatic brake unit on a rail vehicle upon receiving an emergency braking request from the second trainline. The pneumatic trainline control unit includes an air piloted transfer valve, an air piloted maintaining valve, a charging magnet valve, an emergency release magnet valve, a low pressure switch, an air piloted vent valve and a pipe network. The pipe network allows the first trainline to supply air to the transfer valve, the charging valve and the maintaining valve. The transfer valve features a transfer pilot port. It connects a command port of the pneumatic trainline control unit to atmosphere unless its transfer pilot port receives the emergency braking request in which case it connects the pipe network to the command port. The low pressure switch closes if the second trainline charges to a preset pressure. Upon closure of the pressure switch and a manually initiated command from the controller, the charging valve allows the pipe network to charge the second trainline to a minimum threshold level. The maintaining valve features a main pilot port. It permits the pipe network to keep the second trainline charged unless pressure at its main pilot port falls below the minimum threshold. When pressure in the second trainline drops faster than a predetermined rate, the vent valve vents the second trainline to atmosphere.
REFERENCES:
patent: 4598953 (1986-07-01), Wood et al.
patent: 5503464 (1996-04-01), Cunkelman
Mazur Richard J.
Wood James A.
Graham Matthew C.
Westinghouse Air Brake Company
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