FIELD: oil gas producing industry. SUBSTANCE: mounted on upper and lower parts of plunger are clutches with stacks including pairs of magnetic rings magnetized in radial direction and oriented relative to each other in direction opposite to magnetizing and paramagnetic gaskets. Gap between plunger and cylinder is filled with ferromagnetic fluid, viz.: suspension containing ferromagnetic particles made from material possessing high saturation induction. EFFECT: enhanced reliability; increased service life of pumps. 2 cl, 2 dwg
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Authors
Dates
2001-08-27—Published
2000-04-25—Filed