Piston sealing mechanism for liquid additive injection pump

Details Piston sealing mechanism for liquid additive injection pump Piston sealing mechanism for liquid additive injection pump

2006-11-07

2006-11-07

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Self-proportioning flow systems

C092S207000, C092S209000, C277S437000, C277S439000

Reexamination Certificate

active

07131454

ABSTRACT:
A system for injecting a predetermined amount of a secondary fluid into a primary fluid stream uses a liquid additive injection pump driven by a fluid powered motor driven by the primary fluid stream. The liquid additive pump has a reciprocating piston movable within a cylinder between upstroke and downstroke positions to meter the secondary fluid and a piston sealing mechanism comprising spaced-apart distal and proximal sealing elements. The distal piston-sealing element is flared in the direction of piston downstroke and the proximal piston-sealing element is flared in the direction of piston upstroke.

REFERENCES:
patent: 1977075 (1934-10-01), Magnuson
patent: 3866621 (1975-02-01), Greene, Jr.
patent: 4572229 (1986-02-01), Mueller et al.
patent: 4601235 (1986-07-01), Roberts
patent: 5433240 (1995-07-01), Mueller
patent: 6357466 (2002-03-01), Walton et al.

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