Multi-stream fluid sampling valve

Details Multi-stream fluid sampling valve Multi-stream fluid sampling valve

1988-03-31

1989-06-20

Levy, Stewart J.

Measuring and testing

Sampler, sample handling, etc.

Analyzer supplier

7386333, 7386356, G01N 100

Patent

active

048400742

ABSTRACT:
The invention provides a sample valve adapted to produce a sample of any one of a plurality of fluid streams for an analytical instrument (especially a mass spectrometer). It comprises a stationary plate member in which are formed a plurality of inlet ports. A sampling head is mounted from a drive shaft which is rotated to select one of the inlet ports. A sample of the fluid flowing through the selected inlet is taken by a narrow-bore pipe and is transferred via a rotary shaft sealing means to a stationary output member. Excess gas from the selected inlet port passes inside a sleeve member in the sampling head and into a purging chamber adjacent to the exterior of the sealing means, thereby minimizing contamination of the sample through a leak in the sealing means.

REFERENCES:
patent: 2721578 (1955-10-01), Pouppirt
patent: 3209343 (1965-09-01), Dunham et al.
patent: 3425446 (1969-02-01), McNown
patent: 3757583 (1973-09-01), Ludewig
patent: 3827302 (1974-08-01), Sato
patent: 4113434 (1978-09-01), Tanaka et al.
patent: 4156437 (1979-05-01), Chivens et al.
patent: 4601211 (1986-07-01), Whistler

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