Sampler incorporating pressure balanced check valve

Details Sampler incorporating pressure balanced check valve Sampler incorporating pressure balanced check valve

1983-01-07

1985-12-10

Swisher, S. Clement

Measuring and testing

Sampler, sample handling, etc.

Withdrawing through conduit or receptacle wall

G01N 114

Patent

active

045571511

ABSTRACT:
A sampling apparatus having a pressure balanced check valve is set forth in the preferred and illustrated embodiment. The sampling system includes an elongate probe which is driven by a diaphragm motor. The probe extends through a fixed housing and terminates at a sample collection head. The probe is provided with a lengthwise passage in it. Sample is collected from a pumping apparatus comprising a reciprocating anvil and a fixed hammer. These two unyielding members are reciprocated toward one another. They capture, therebetween, a resilient plug having a dished area which collapses on pressure. This forces sample from the dished area. It flows into a passage, into the probe, through a check valve. The check valve is pressure balanced so that the force required to overcome it is not dependent on line pressure, sample collection container back pressure and the like. Dead volume is reduced to an absolute minimum.

REFERENCES:
patent: 3074425 (1963-01-01), Kikendall
patent: 3412613 (1968-11-01), Brown et al.
patent: 3812722 (1974-05-01), Soudelier
patent: 4350051 (1982-09-01), Thompson
patent: 4372382 (1983-02-01), Rooney et al.
patent: 4403518 (1983-09-01), Welker
Series 200 Grab Sampler (a sales brochure), Jiskoot Auto-Control L.T.D., Tunbridge Wells.Kent.TN2DJ, England.

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