| 摘要 |
A distribution valve includes a housing having an upper fluid inlet, a plurality of bottom fluid outlets and enclosing a rotary impeller disposed directly beneath the fluid inlet, and a plurality of stationary baffles disposed between a bottom plate of the impeller and the fluid inlet for directing portions of the incoming fluid directly at a plurality of vertical vanes supported at the bottom plate of the impeller. A stationary planetary gear disposed about a vertical axis of the distribution valve engages a pair of symmetric gear assemblies supported on a rotary gear assembly base and each driven by a drive gear attached to the impeller. A foot-shaped cam is attached to the lower portion of the rotary gear assembly base and rotates through a 360 DEG angle, sequentially lifting each of a plurality of spherical valve balls from its seat in the bottom of the housing. The radius of the cam, measured from its eccentric point to the point of initial contact with each valve ball, is shorter than the radius to subsequent contact points in order to obtain higher initial mechanical advantage. A ring-shaped cam also is attached to and rotates with the rotary gear assembly and has a skirt which holds all of the valve balls in their seats except when they are being lifted by the foot-shaped cam, thereby preventing oscillatory excursions of the seated valve balls.
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