| 摘要 |
FIELD: pumps used in oil refining industry and construction industry; handling viscous abrasive liquids under pressure. SUBSTANCE: valve unit includes body with inlet and outlet passages; fitted in valve bore is valve seat with ball shut-off member and device for turning the ball shut-off member which is made in form of ball weight located movably in spherical cavity of ball shut-off member. EFFECT: enhanced reliability. 2 cl, 3 dwg
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