Method and device at a hydrodynamic pump piston

Details Method and device at a hydrodynamic pump piston Method and device at a hydrodynamic pump piston

2006-01-10

2006-01-10

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

Piston

With fluid passage in piston face

C092S160000

Reexamination Certificate

active

06983682

ABSTRACT:
A method and device for forming a sliding seal between a reciprocating piston (22) and the wall of a cylinder (8), wherein one side of the piston faces a first liquid in a pump chamber (26) of the cylinder (8), a first piston seal (24) and a second piston seal (58), spaced from the first piston seal (24), sealing between the piston and the cylinder (8); and wherein a second liquid is supplied under pressure between the seals (24, 58), the pressure of the second liquid between the seals (24, 58) being maintained at a level essentially equal to or slightly lower than the pressure of the pump chamber (26).

REFERENCES:
patent: 2615769 (1952-10-01), Barnes et al.
patent: 4270440 (1981-06-01), Lewis, II
patent: 5701797 (1997-12-01), Mohn
patent: 0 158 457 (1985-10-01), None
patent: 0 694 139 (1996-01-01), None
patent: 65477 (1980-08-01), None
patent: 843735 (1985-03-01), None
patent: WO 86/03817 (1986-07-01), None
patent: WO 94/244468 (1994-10-01), None

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