FIELD: engines and pumps.
SUBSTANCE: proposed pump comprises element creating compression (in other words, a plunger) made up of single solid body with central and lateral parts. Plunger central part is furnished with grooves that make labyrinth seal. In displacement of plunger, its lateral parts perform centering, stay in contact with sealed cylinder surface via wear-resistant built-up material, take up loads and remove loads from said seal. At whatever load solid design of plunger and seal rules out skew and additional centering of plunger in chamber being sealed.
EFFECT: longer life, higher operating performances.
4 cl, 1 dwg
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