Fluid handling – Processes – Involving pressure control
Reexamination Certificate
2005-01-11
2005-01-11
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Processes
Involving pressure control
C091S424000, C137S596160
Reexamination Certificate
active
06840258
ABSTRACT:
A double valve is reset when a source of pressurized fluid is connected to a reset port. When the source of pressurized fluid is removed from the reset port, a first reset piston is retracted so that a second pilot chamber receives pressurized fluid while a first pilot chamber continues to be vented. A second reset piston is retracted after a predetermined delay time following retraction of the first reset piston, the predetermined delay time being sufficient to allow the second pilot chamber to become substantially pressurized. If a second pilot valve is actuated when the second reset piston is retracted, then the pressurized fluid in the second pilot chamber drives the second movable valve unit out of a deactuated position during a time that pressurized fluid in the first pilot chamber is insufficient to drive the first movable valve unit out of a deactuated position.
REFERENCES:
patent: 4542767 (1985-09-01), Thornton et al.
patent: 5796571 (1998-08-01), Wetzel et al.
patent: 5912795 (1999-06-01), Wetzel et al.
patent: 5927324 (1999-07-01), Russell et al.
patent: 6478049 (2002-11-01), Bento et al.
Foster Joseph E.
Russell Neil E.
Michalsky Gerald A.
Mollon Mark L.
Ross Operating Valve Company
LandOfFree
Dynamically-monitored double valve with anti-tiedown feature does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamically-monitored double valve with anti-tiedown feature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamically-monitored double valve with anti-tiedown feature will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3439307