| 摘要 |
A valve ( 20 ) comprises a valve body ( 22 ) having for defining a valve chamber ( 28 ) and having plural ports (P). A flow restrictor ( 32 ) is situated in the valve chamber ( 28 ) for providing selective communication of fluid between selected ones of the plural ports (P). One or more piezoelectric actuator(s) ( 40 ) displace the flow restrictor ( 32 ) to achieve the communication of the fluid between selected ones of the plural ports (P). In one example embodiment a biasing element ( 48 ) is situated in the valve chamber opposite the piezoelectric actuator ( 40 ). In another example embodiment, two piezoelectric actuators ( 40 ) are provided, one at each of opposing ends of the valve chamber ( 28 ).
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