Non-flowing pilot valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Sep 14, 2000
filing date -
Sep 14, 1999
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Abstract
A non-flowing pilot valve is disclosed having a sense piston assembly (16) and a feedback sleeve (40) co-axially mounted within a valve body (12). A dome-line chamber (32) and an exhaust-line chamber (34) are isolated from each other by a feedback sleeve top shoulder (48) contacting a pop seal (52) on the valve body (12) below set pressure. At a few percentage points of inlet (19) pressure below set pressure, a reseat seal of a foot (20) portion of the sense piston (16) contacts the bottom shoulder (48) of the feedback sleeve (40) thereby closing off the dome-line chamber (32) from below and above and 'locking in' dome line pressure. An increase in inlet (19) pressure above set pressure causes the sense piston (16) to move up simultaneously carrying feedback sleeve (40) with it thereby opening the dome-line chamber (32) to the exhaust-line chamber (34) below the open top shoulder (48).
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