Measuring and testing – Sampler – sample handling – etc. – Analyzer supplier
Patent
1986-04-02
1987-04-07
Levy, Stewart J.
Measuring and testing
Sampler, sample handling, etc.
Analyzer supplier
7386484, 251314, G01N 100
Patent
active
046550950
ABSTRACT:
The invention resides in a compound valve having utility in a sample injector for a liquid chromatograph. The valve has a pair of rotary spool valves (52, 54), each valve has a shaft (60) with an axial bore (64) in one end and a radial bore (66) communicating with the axial bore. A valve seal (70) surrounds the shaft. A pair of radial passageways (77, 78) in the seal are aligned diametrically and lie in a common plane with the radial bore (66) in the valve shaft. A pinion (62) is fixed to each shaft and a common driving gear (68) engages each pinion to rotate both shafts simultaneously through 180.degree. to place the radial bores in the shafts in communication selectively with either radial passageway in the valve seals.
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Richards William
Russo Manuel A.
Levy Stewart J.
Millipore Corporation
Raevis Robert R.
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