| 摘要 |
A rotary fluid pressure device ( 11 ) has a stationary valve member ( 17 ), a rotatable valve member ( 51 ), and a valve seating mechanism ( 73 ). The valve seating mechanism ( 73 ) defines an outer balance ring member ( 75 ) having a valve-confronting surface ( 79 ) in engagement with an opposite surface ( 81 ) of the rotatable valve member ( 51 ) and an inner balance ring member ( 77 ) having a valve-confronting surface ( 111 ) in engagement with the opposite surface ( 81 ) of the rotatable valve member ( 51 ), with the outer balance ring member ( 75 ) and the inner balance ring member ( 77 ) being structurally independent from the other. The outer balance ring member ( 75 ) and the inner balance ring member ( 77 ) define a balance ring passage ( 71 ) which provides continuous fluid communication between a fluid inlet ( 53 ) or a fluid outlet ( 53 ) and the valve passages ( 61 ) in the rotatable valve member ( 51 ).
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