Gas chromatograph sample valve

Details Gas chromatograph sample valve Gas chromatograph sample valve

2005-03-08

2005-03-08

Cygan, Michael (Department: 2855)

Measuring and testing

Gas analysis

Gas chromatography

C137S885000, C251S331000

Reexamination Certificate

active

06862916

ABSTRACT:
The present invention is a sample valve for use in conjunction with a gas chromatograph. The sample valve design provides for both the inertness and low permeability performance of a diaphragm, and an elastomeric material to apply adequate sealing pressure to the diaphragm to seal with the mating surface of a center plate of the sample valve. This valve design allows the active sealing surface to be well polished without the previous concern for maintaining critical flatness of the mating surfaces of the machined parts.

REFERENCES:
patent: 3934611 (1976-01-01), Gachot et al.
patent: 5090659 (1992-02-01), Bronnert
patent: 5703359 (1997-12-01), Wampler, III
patent: 5775371 (1998-07-01), Pan et al.
patent: 6453725 (2002-09-01), Dahlgren et al.
patent: 6601606 (2003-08-01), Xu et al.
patent: 6715733 (2004-04-01), Wang et al.
patent: 6742544 (2004-06-01), Bergh et al.

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