Sample metering valve for a sample preparation system

Details Sample metering valve for a sample preparation system Sample metering valve for a sample preparation system

1987-06-16

1989-09-19

Levy, Stewart J.

Measuring and testing

Sampler, sample handling, etc.

Capture device

G01N 100

Patent

active

048669962

ABSTRACT:
A sample metering valve for both liquid samples and slurry samples with entrained gas bubbles. The sample metering valve for liquids is comprised of a piston with sample chambers formed in the side thereof said piston moving freely into and out of a cylinder having an aperture matching the size of the piston. Sealing is provided by a seal which has no dead volume which cold flows under a spring bias to maintain the seal under various operating conditions. The sample metering valve for slurry samples includes a syringe embodiment having separately moving piston and valve in a cylinder. The syringe valve sucks up sample with a piston, isolates the sample with the valve and compresses the entrained gas bubbles with the piston. Another embodiment uses three, three way valves which are coupled to a pump and a means to compress the sample. The valves are operated to suck a portion of sample up into the tubes connecting the valves, isolate the sample from the sample container, compress the sample using the compressed gas and trap a known volume of the compressed sample in the tube between valves. The trapped sample is then flushed out of the system with diluent to prepare the sample for analysis.

REFERENCES:
patent: 1078784 (1913-11-01), Grisham
patent: 1811814 (1931-06-01), Worden
patent: 4143883 (1979-03-01), Paynter
patent: 4269064 (1981-05-01), Johnson et al.
patent: 4433587 (1984-02-01), Risdal
patent: 4538790 (1985-09-01), Williams et al.
patent: 4582329 (1986-04-01), Stalph
patent: 4630636 (1986-12-01), Cutcher

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