Quick vent valve for air brake line
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United States of America Patent
Stats
-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Sep 28, 1988
filing date -
Sep 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve has a direct flow passage extending therethrough. A flexible diaphragm (170) is positioned between a main valve seat (156) and an exhaust seat (172). Flow of pressurized air into the valve (110) through the inlet port (142) deflects the diaphragm (170) away from the main seat (156) and seals it against the exhaust seat (172). Higher pressure at the delivery port (144) than the inlet port (142) move the diaphragm (170) away from the exhaust seat (172) and against the main seat (156). A shunt passageway communicates portions of the flow passage on opposite sides of the diaphragm (170) to prevent maintenance of residual positive pressure on the delivery side of the diaphragm (170). The shunt passageway includes a groove (161) along the frustoconical main seat (156) and peripheral cutouts (171) on the diaphragm (170). In one embodiment (210) of the valve, a push member (272,276) moves against the diaphragm (270) to help unseat it from the exhaust seat (272).
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