Nonsymmetrical valve

Details Nonsymmetrical valve Nonsymmetrical valve

1989-07-17

1991-04-30

Rosenthal, Arnold

Fluid handling

Systems

Multi-way valve unit

13762511, F16K 1174, F16K 308

Patent

active

050109219

ABSTRACT:
A conventional injection valve, such as used in high performance liquid chromatography apparatus, having six ports and three channels for connecting the ports in two different positions, is modified so that one of the channels is longer than the other two. In this way, when the valve is switched to the load position, one of the ports is always connected to the channel prior to the other port being connected. This improvement in the valve makes the valve more accurate and reduces undesirable mixing of sample and mobile phase in the valve when injecting small quantities of sample.

REFERENCES:
patent: 937406 (1909-10-01), Beardsley
patent: 1348123 (1920-07-01), Muth
patent: 3422848 (1969-01-01), Liebman et al.
patent: 3570536 (1971-03-01), Walker et al.
patent: 4049020 (1977-09-01), Neveux

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