| 摘要 |
The present invention relates to an electrically operated valve ( 10 ), which has a valve housing ( 11 ); a spool ( 12 ); a first fluid conduit ( 14 ) connecting the valve ( 10 ) with a source of pressurized fluid; a second fluid conduit ( 15 ) connecting the valve ( 10 ) with a reservoir of fluid; and a third fluid conduit ( 16 ) in communication with valve ( 10 ) which delivers fluid to or receives fluid from apparatus which uses the hydraulic fluid flow controlled by the valve ( 10 ). The spool ( 12 ) is biased to a rest position by a pair of opposed springs ( 17,18 ) and in the rest position closes off the first ( 14 ) and second ( 15 ) fluid conduits. A first electric coil ( 19 ) associated with a first end of the spool ( 12 ) when activated displaces the spool ( 12 ) to open the first fluid conduit ( 14 ). A second electric coil ( 20 ) associated with a second end of the spool ( 12 ) when activated displaces the spool ( 12 ) to open the second fluid conduit ( 15 ).
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