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United States of America Patent
Stats
-
Jan 2, 2007
Grant Date -
Nov 25, 2004
app pub date -
Dec 1, 2003
filing date -
Nov 29, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A back pressure chamber is defined at an end of a rod for acting in a direction to cancel out a pressure applied to a valve head, and an aspirator chamber is defined closely to the valve head for developing a pressure lower than a secondary pressure due to a suction caused by a nozzle. The rod has a first communication hole and a second communication hole that are defined therein which provides fluid communication between the back pressure chamber and the aspirator chamber.
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