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Fluid control element
| Details |
Inventors: Dettmann, Heinrich;
Assignee: Burkert Werke GmbH & Co (Ingelfingen, DE)
Primary Examiner: Michalsky; Gerald A.
Assistant Examiner:
Attorney, Agent or Firm: Nixon Peabody LLP, Friedman; Stuart J.
A fluid control element comprises a housing in which two control chambers are formed, which are isolated from each other and comprise a working port each as well as two pressure ports. Two of these ports are provided with a sealing seat each. The fluid control element further comprises a switching element movably mounted in said housing and comprising a sealing part in each control chamber. The sealing part cooperates with the sealing seats such that these are opened or closed. The fluid control element further comprises an actuating member for the switching element, the actuating member being able to bring the switching element into three positions. |
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DETAILED DESCRIPTION OF THE INVENTION Referring now to FIGS.
1 and 2, the configuration of the control elements in accordance with the invention will now be described in general.
The control element 10 comprises a housing 12 in which two control chambers 20, 30 are configured so as to lie side by side and isolated from each other (only one of the chambers can be seen in FIG.
1).
Opening into each control chamber is a working port and two pressure ports, the working port being identified by A and B, respectively, and the pressure ports by P and R, respectively.
Two of the ports in each control chamber 20 and 30, respectively, are provided with a sealing seat 21, 22 and 31, 32, respectively.
Cooperating with the sealing seats 21, 22 and 31, 32 is a switching element identified in general by the reference numeral 14.
The switching element 14 is movable from a resting position into a first and a second position by acting on an actuator protuberance 15.
In all, three positions of the switching element 14 are thus possible.
For actuating the switching element 14 an actuating member 16 is provided (see also FIG.
12) configured, for example, as a solenoid drive having a polarized drive element, the permanent magnet of which in the non-energized condition of a solenoid causes a middle position of the actuator protuberance 15 and in the energized condition shifts the actuating arm in the direction of either arrow 1 or arrow 2, depending on the direction of the current.
Referring now to FIG.
12 there are illustrated the two positions 1 and 2 of a magnet 17 applied to the actuator protuberance 15.
The solenoid of the actuating member is identified by the reference numeral 18 and the switchable voltage source is identified in FIG.
12 by the reference numeral 19.
The basic configuration of the switching element 14 consisting of a core 11 and an elastomer 13 surrounding the latter, as well as the mounting arrangement of the switching element in the housing 12 is known in principle from U.
S.
Pat.
No.
5,711,346 incorporated herein by reference
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