Concentration valve for a gas detecting apparatus, or the like
US4128008A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1977 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | May 4, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/204
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.