Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Reexamination Certificate
2006-02-08
2010-11-09
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
C137S596160, C251S026000
Reexamination Certificate
active
07828008
ABSTRACT:
A system and a method for partial stroke testing of a critical valve using a bypass valve includes flowing two streams of gas simultaneously through a bypass valve, opening the critical valve with the gas from the bypass valve, and determining a calibration time interval for closing the opened critical valve to a preset partial stroke testing position. The method includes determining a measured time interval for closing the opened critical valve, creating a tolerance band, and comparing the measured time interval to determine if the critical valve passes the partial stroke testing. The system includes a two stage bypass valve, having four solenoid valves. The system includes a processor with a memory having partial stroke testing logic. Each solenoid valve and the bypass valve include a pressure sensor.
REFERENCES:
patent: 5217199 (1993-06-01), Frey
patent: 2004/0093173 (2004-05-01), Essam
patent: 2006/0191314 (2006-08-01), Karte
patent: 2009/0000672 (2009-01-01), Goll
patent: 641919 (1995-03-01), None
patent: WO 2005097792 (2005-10-01), None
Beckman Lawrence V.
Lengyel Larry G.
Buskop Wendy
Buskop Law Group PC
McCalister William
Rivell John
SafePlex Systems, Inc.
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