| 摘要 |
<p>A valve module for a stream selector includes first and second pistons (170,59) which are axially movable against a biasing force by fluid from an actuation passage acting on undersides of the respective pistons (170,59) to move a valve head (93) from a closed position to an open position where fluid flows from an inlet passage (51,52) into a control chamber portion (50) to an outlet passage (53,54). The stream selector operates at advantageously low actuation air pressures, while providing a valve module that is backwards compatible.</p> |
