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(11) | EP 0 945 617 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Displacement control valve for use in variable displacement compressor |
| (57) For use in a variable displacement compressor having a first and a second passage
which are between a crank chamber and a suction chamber and between a discharge chamber
and the crank chamber, respectively, a displacement control valve is provided with
a first and a second valve mechanism for adjusting opening degrees of the first and
the second passages. The second valve mechanism has a valve body which is placed in
the second passage and movable in a predetermined direction for opening and closing
the second passage with movement thereof in the predetermined direction. The second
valve mechanism is provided with a pressure canceling arrangement for making the valve
body be canceled with influence of pressure of the second passage in the predetermined
direction. A pressure sensing member senses pressure in the first passage. Responsive
to the pressure sensed by the pressure sensing member, the first valve mechanism adjusts
the opening degree of the first passage. Responsive to an operation of the first valve
mechanism, the second valve mechanism adjusts the opening degree of the second passage.
Responsive to an external signal, an external operation mechanism operates the first
and the second valve mechanisms. |