Spring brake modulating relay valve
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United States of America Patent
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-
Aug 3, 2004
Grant Date -
Aug 22, 2002
app pub date -
May 25, 2000
filing date -
May 25, 2000
priority date (Note) -
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status (Latency Note)
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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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