| 摘要 |
A pump piston assembly for a single acting reciprocating pump used in slush pumps handling liquids and semi-liquids carrying abrasives and other solid matter for the circulation of drilling fluid or slush in oil well drilling operations. A cast iron (or forged steel) piston element, having a hub extension for the mounting of an annular piston seal, is provided with a through opening for mounting of the piston assembly on the end of a piston rod. The large diameter metal base of the piston element is provided with a multi-channeled, or grooved, peripheral surface and an annular beveled edge at the piston rear face for the optimal flow of fluid into the piston peripheral surface during back strokes of the piston assembly for optimal fluid lubrication of the piston element within the pump cylinder lining. An annular fluid reservoir groove is also provided in the metal base for optimized retention of fluid for the multi-channeled peripheral surface with some embodiments.
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