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
06840259
ABSTRACT:
A double valve for controlling a machine tool has a memory such that when the valve is in its normal deactuated state and the inlet air supply is cycled (e.g., turned from on to off or from off to on), then the valve remains in the deactuated (i.e., ready to run) state. When the valve is in a faulted state (e.g., intermediate position) and the inlet air supply is cycled, then the valve remains in the faulted state. The memory is achieved by a balanced condition of the movable valve elements when in the normal deactuated position and an unbalanced or latched condition when in the intermediate or faulted 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
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