US 4,128,008 A · Concentration valve for a gas detecting apparatus, or the like

Abstract

A concentration valve for a gas detecting apparatus including a cylinder having diametrally opposed inlet and outlet ports for a sample gas and having diametrally opposed inlet and outlet ports for a carrier gas longitudinally spaced from and in the same longitudinal plane as the sample-gas inlet and outlet ports, a cylindrical plug having a diametral passage therethrough and movable longitudinally of the cylinder between a sampling position wherein the diametral passage communicates with the sample-gas inlet and outlet ports and an analyzing position wherein the diametral passage communicates with the carrier-gas inlet and outlet ports, a pneumatic actuator for longitudinally moving the cylindrical plug between the sampling and analyzing positions, gas adsorbing means in the diametral passage for adsorbing a gaseous material or materials from the sample gas, and means for heating the gas adsorbing means in the analyzing position of the cylindrical plug to desorb the previously adsorbed gaseous material or materials into the carrier gas for transfer to a gas chromatograph, or other analyzing means. The pneumatic actuating means comprises a piston to which the cylindrical plug is secured by a readily releasable connecting means so that it can be removed for replacement by one capable of adsorbing a different material.

Claims3

Dependent claims

In a concentration valve for a gas detecting apparatus, or the like, the combination of:

(a) a cylinder having circumferentially spaced, diametrically opposed inlet and outlet ports for a sample gas, and having circumferentially spaced, diametrically opposed inlet and outlet ports for a carrier gas longitudinally spaced from and in the same longitudinal plane as the sample-gas inlet and outlet ports;
(b) a cylindrical plug provided with a diametrical passage therethrough having ends respectively adapted to communicate with said sample-gas inlet and outlet ports, or with the carrier-gas inlet and outlet ports, said cylindrical plug being movable longitudinally of said cylinder between a sampling position wherein said passage therethrough communicates with said sample-gas inlet and outlet ports and an analyzing position wherein said passage therethrough communicates with said carrier-gas inlet and outlet ports;
(c) adsorbing means in said passage through said cylindrical plug and operable to adsorb in said sampling position;
(d) means for heating said adsorbing means in said analyzing position;
(e) actuating means for longitudinally moving said cylindrical plug between said sampling and analyzing positions, said actuating means comprising a second cylinder coaxial with the cylinder first mentioned, a piston in said second cylinder, means for securing said cylindrical plug to said piston, and valve means for selectively directing air under pressure to opposite ends of said piston;
and
(f) said means for securing said cylindrical plug to said piston comprising a readily releasable connecting means.

4 more elements

Dependencies are inferred from the claim text.

Concentration valve for a gas detecting apparatus, or the like

Life of this patent

Concentration valve for a gas detecting apparatus, or the like

Life of this patent

Abstract

Claims3