| 摘要 |
<p>A rotary valve (10) includes a valve cap (12), a valve body (50), a rotary valve disk (30), and an actuator (90,140). The valve body (50) includes first and second sets of fluid flow passages (102 and 104), with each set having a drain, a fluid inlet, a fluid outlet and a fourth passage connected to the fluid outlet passage. The rotary disk (30) includes first and second connecting passages. The actuator and rotary disk have first and second positions in which various passages of each set of fluid flow passages aligned with and connected by the connecting passages and a third position in which the fluid outlet passage of each set of fluid flow passages is connected to the drain passage of the other set of fluid flow passages.</p> |
