Title:
SPRING BRAKE MODULATING RELAY VALVE
Document Type and Number:
WIPO Patent Application WO2001089900
Kind Code:
A3
Abstract:
A combined spring brake modulating relay valve integrates the functions of a relay valve and a modulating valve. The housing includes a valve assembly movable in response to air pressure provided to selected ports in the housing. A relay piston selectively communicates with a control port and a primary brake circuit port. A modulating piston includes surfaces selectively pressurized by the primary brake circuit port and a secondary brake circuit port. This modulates the pressure from the delivery port to thereby selectively apply the associated spring brakes if a failure is detected at the primary brake circuit port. The exhaust member selectively controls communication between the supply and delivery ports as necessary.
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Inventors:
MARSH ANDREW
ROSS RICHARD T
KNIGHT DAVE
EBERLING CHARLES
KEMER JOHN
ROSS RICHARD T
KNIGHT DAVE
EBERLING CHARLES
KEMER JOHN
Application Number:
PCT/US2001/016391
Publication Date:
March 28, 2002
Filing Date:
May 22, 2001
Export Citation:
Assignee:
HONEYWELL INT INC (US)
International Classes:
B60T13/26; B60T15/20; (IPC1-7): B60T13/26; B60T15/24; B60T15/20
Foreign References:
| EP0407751A1 | 1991-01-16 | |||
| US3861754A | 1975-01-21 | |||
| GB1252169A | 1971-11-03 | |||
| US4003605A | 1977-01-18 |
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