Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Reexamination Certificate
1994-06-03
2001-07-31
Michalsky, Gerald A. (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
C251S038000, C251S044000
Reexamination Certificate
active
06267349
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to precision control of valve systems and particularly to precision, fully electronically controlled, hermetically sealed valve systems.
BACKGROUND OF THE INVENTION
Hydraulic valve systems, whether completely sealed or not, rely on calibrated input control for the positioning of the valve and control of flow rate and the like. The input control is generally mechanical or electro-mechanical in nature. Accordingly, relatively large deviations from the desired valve position and flow rate are inevitable. Even fully electronic controls do not overcome such deviations, because of the mechanical nature of the valves involved, as well as the constantly varying hydraulic pressures used in the actuation of the valve or valves.
SHORT DESCRIPTION OF THE INVENTION
It is accordingly an object of the present invention to provide a highly accurate precision valve control system utilizing an electronic control signal and continuous electronic feedback.
It is a further object of the present invention to provide such precision valve control system having a completely sealed hydraulic valve.
It is a still further object of the present invention to provide such precision valve control system with variable split ranging, slew rate control, tight shutoff, seat protection and steady state current limiting.
These and other objects, features and advantages of the resent invention will become more evident from the following discussion and drawings in which:
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Gomes Karl G.
Liantonio Vito
Klauber Stefan J.
Klauber & Jackson
Michalsky Gerald A.
Target Rock Corporation
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