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Abstract

A system for pumping liquid under high pressure includes a housing and a high pressure seal. The housing houses a pump assembly and a chamber assembly that includes a chamber for containing high pressure liquid. The seal separates high pressure area in the chamber assembly from low pressure area in the pump assembly. The seal includes a seal opening that receives a piston that moves axially to increase pressure on the liquid in the chamber; an active sealing area adjacent the chamber; a compressible sealing area adjacent the active sealing area; and a connection channel formed through the compressible sealing area between the seal opening and a leakage space formed between the housing and the high pressure seal. The connection channel conducts the liquid, leaked into the leakage space from the chamber, from the leakage space to the seal opening during operation of the piston, providing lubrication for the piston.

First Claim