Multi-stage piston type compressor

Pumps – Expansible chamber type – Valved piston

Reexamination Certificate

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Details

Other Related Categories

C417S555100, C417S552000

Type

Reexamination Certificate

Status

active

Patent number

07351044

Description

ABSTRACT:
In order to achieve a high level of impermeability with a low closing force for the sealing elements of a multistage piston compressor, the overflow channel (19) in the valve piston (9) opens into at least two passages (26, 27) and the sealing plate of the overflow check valve (20) that is located in the valve piston (9) is configured as a freely guided closing membrane (28) with a limited stroke. The passages (26, 27) of the overflow channel (19) have different diameters, are arranged on a graduated circle at a radial distance from the axis of the closing membrane (28) and are completely covered by the closing membrane (28).

REFERENCES:
patent: 3536424 (1970-10-01), Plos
patent: T0883011 (1971-02-01), Miller
patent: 4289159 (1981-09-01), Ehemann et al.
patent: 4532685 (1985-08-01), Itoh et al.
patent: 4846633 (1989-07-01), Suzuki et al.
patent: 4890637 (1990-01-01), Lamparter
patent: 5022832 (1991-06-01), Lauterbach et al.
patent: 5658134 (1997-08-01), Gagnon et al.
patent: 6056439 (2000-05-01), Graham
patent: 2005/0031476 (2005-02-01), Antufjew et al.

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