FIELD: sealing technology; drilling rigs for handling abrasive-containing liquids, mainly at increased pressures and temperatures. SUBSTANCE: sealing collar of slush pump piston is made from polyurethane elastomer and is provided with abrasive cleaning edge on outer sealing surface. Sealing collar is engageable with collar holder over circular inner and outer surfaces of radius profile whose radii satisfy the following ratio: $$$, where $$$ is radius of profile of inner circular surface of sealing collar, mm; $$$ is radius of profile of outer circular surface of collar holder, mm. EFFECT: enhanced efficiency of sealing. 2 dwg
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