Additive pump

Details Additive pump Additive pump

2011-08-02

2011-08-02

Patel, Vishal (Department: 3674)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C277S500000

Reexamination Certificate

active

07988156

ABSTRACT:
A seal assembly, for an additive pump having a reciprocating piston, is provided. The seal assembly includes a seal carrier having first and second components each having a bore therein to receive the piston. Each component has an end face arranged to abut one another when arranged axially on the piston, and a face seal is interposed between the end faces to inhibit egress of fluid between the end faces. A pair of circumferential seals at axially spaced locations are provided along the seal carrier and operable to engage the piston during reciprocating thereof, and a drain port intersecting one of the bores intermediate the seals is provided to permit egress of fluid from between the seals.

REFERENCES:
patent: 4071254 (1978-01-01), Raimondi et al.
patent: 6422569 (2002-07-01), Comes et al.
patent: 2004/0056424 (2004-03-01), Busse et al.
patent: 2004/0206229 (2004-10-01), Morrison
patent: 2004/0227301 (2004-11-01), Wood et al.
patent: 2005/0087935 (2005-04-01), Hughes

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