Valves and valve actuation – Electrically actuated valve – Having element dimensionally responsive to field
Reexamination Certificate
1997-05-06
2001-07-10
Rivell, John (Department: 3753)
Valves and valve actuation
Electrically actuated valve
Having element dimensionally responsive to field
C251S161000, C251S187000
Reexamination Certificate
active
06257548
ABSTRACT:
The invention relates to a valve construction having a housing within which are at least two ports and a slide movable between positions in which at least one of the ports is selectively open or closed.
BACKGROUND OF THE INVENTION
Valves are known in the art for the most varied uses. They have at least two connections and a slide which is movable to and fro between at least two setting positions, wherein the slide seals at least one connection in one setting position and opens it in the other setting position. Positioning means to perform the positioning function and sealing means to perform the sealing function of the slide are also provided.
An electromagnetic injection valve for fuels is known from U.S. Pat. No. 4,679,000, in which a slide opens the communication between two connections in one setting position and closes it in the other setting position. By control of an electromagnetic actuating device the slide is brought into the closed position, the front end thereof coming into contact with a corresponding seal seat. Thus the electromagnetic actuating device on the one hand produces the positioning force and on the other hand produces the sealing force onto the slide. In the closed position the slide is clamped by means of a piezoelectric element. In this known valve the electromagnetic actuating device is of relatively large construction since on the one hand it must provide a relatively large adjustment distance of the slide and on the other hand it must apply a relatively great sealing force in the closed position.
The object of the invention, therefore, is to improve the known valve so that it can be set more effectively and more reliably.
SUMMARY OF THE INVENTION
According to the invention this object is achieved by the characterising feature of claim
1
, in that the positioning means have a positioning actuator and the sealing means have a sealing actuator which can be control led separately from one another. Thus the “positioning” and “sealing” functions of the slide during the valve operation can be achieved by a plurality of separate actuators. In this case each actuator can be optimally designed for its function, particularly with regard to adjustment distance and adjusting force. Thus a comparatively large adjustment distance with a small adjusting force will be required of the positioning actuator, whilst the requirements are the reverse for the sealing actuator, namely a small adjustment distance and a relatively great adjusting force.
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Grove Horst
Hiddessen Ralf
Ossenbrugge Jan-Peter
Rieck Frank
Nass Magnet GmbH
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
Rivell John
Schoenfeld Meredith H.
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