Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
1999-12-15
2001-09-11
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C137S596160
Reexamination Certificate
active
06286547
ABSTRACT:
The invention relates to a module comprising a pilot valve and four switching valves, in particular for driving actuators.
BACKGROUND OF THE INVENTION
Such a module may form a 5/3- or 4/3- way valve and makes it possible to drive an actuator, for example, a double-acting hydraulic cylinder. The pilot valves are usually formed by sliding valves, more particularly two solenoid pilot valves. The slider assumes a center position when the pilot valves are not energized, whereas the slider assumes either a first or a second off-center switching position when one or the other pilot valve is driven. A similar or even higher piloting requirement is needed for corresponding diaphragm valves in 5/3- and 4/3- way arrangements. It is especially when these valves are used in in-line valve islands that high complexity results in wiring the solenoid contacts of the pilot valves to a control terminal.
The object of the invention is to simplify driving fluid-actuated 5/3- and 4/3- way valves such that all three switching positions of the valves may be switched by a single solenoid of a pilot valve.
BRIEF DESCRIPTION OF THE INVENTION
This object is achieved with a module comprising a pilot valve and four switching valves, in particular for driving actuators, the pilot valve being a 4/3- way valve. In this way the complication and bulk of the two solenoid pilot valves provided hitherto is reduced to that involved in a single pilot valve, thus facilitating the connection of the valves to valve islands and interlinking such valves to a common power/fluid supply.
Advantageous aspects of the invention read from the sub-claims.
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Burkert Werke GmbH & Co.
Friedman Stuart J.
Michalsky Gerald A.
Nixon & Peabody LLP
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