Fluid pressure control valve device for a railway car
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United States of America Patent
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-
Sep 15, 1992
Grant Date -
N/A
app pub date -
Sep 24, 1991
filing date -
Sep 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control valve device for a railway car having an arrangement for changing the axial position of a variable area piston in order to adjust the output pressure of a piston valve assembly in accordance with a high or low speed of the railway car. The axial position of a supply valve seat is set in accordance with a high or low speed signal to in turn set the axial posiiton at which the piston assembly, including the variable area piston, assumes a lap condition.
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