Fluid-pressure and analogous brake systems – Automatic – Equalizing valves
Patent
1998-03-10
2000-01-25
Schwartz, Chris
Fluid-pressure and analogous brake systems
Automatic
Equalizing valves
303 3, 303 83, 303 86, B60T 1134
Patent
active
060170980
ABSTRACT:
A brake pipe control apparatus of the type that defines primary and control passage networks has been improved. The primary passage network interconnects the brake pipe to at least one pneumatic valve in the apparatus. The control passage network interconnects a source of control pressure to at least one magnet valve used to cause operation of the pneumatic valve(s). The improvement includes first and second check valves and a passageway added between the two passage networks. The first check valve is incorporated into the control passage network between an inlet channel thereof that connects to the source and a branched channel thereof that connects to the magnet valve(s). The first check valve is situated to prevent air from flowing to the source from the branched channel when pressure in the source is low relative to pressure in the branched channel. The passageway interconnects the branched channel and the primary passage network. Placed into the passageway, the second check valve is situated to allow air to flow from the primary passage network to the branched channel when pressure in the source is low relative to pressure in the brake pipe. Pressure is thus maintained in the branched channel thereby allowing the magnet valve(s) during operation thereof to cause proper operation of the pneumatic valve(s) of the apparatus even if the source fails to provide air at the control pressure ordinarily expected.
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Kettle, Jr. Paul J.
Santoro, Jr. Ralph
Schwartz Chris
Westinghouse Air Brake Company
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