| 摘要 |
<p>A switch valve (10) is provided with an upper body (14) having a plurality of outlet ports (20A, 20B and 20C) and lower body housing (16) with inlet port (18). The switch valve (10) includes a ball member (22) which is rotatable within the switch valve body (12) for selective fluid communication between the inlet port (18) and the selected one of the plurality of outlet ports (20A, 20B or 20C). The ball (22) is rotated by a stem (28), which may be powered by an actuator unit (30). The upper body (14) includes a substantially dome-shaped seating surface (40) for sealing engagement with the outer surface (38) of the ball (22). The biasing member (48) biases the ball (22) radially in a direction opposite the ball inlet port (24) to obtain the desired sealing engagement. The biasing member (48) is preferably a Belleville spring (48) having a single wrap design.</p> |
