FIELD: engines and pumps.
SUBSTANCE: shut off valve and hollow rod seal are arranged at the pump top section. Extra pressure chamber is communicated with the main pressure chamber via bores in the plunger cage. Said extra pressure chamber is composed of the cylinder inner surface and hollow rod outer surface. One of its end surface is blind while the second end is composed by the plunger cage with the bores. Suction and delivery valve shutoff elements are shaped to hemisphere secured at the rod sliding in guide bushes.
EFFECT: higher reliability.
2 cl, 1 dwg
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