Multiport valve system through which sample gas continuously flo

Details Multiport valve system through which sample gas continuously flo Multiport valve system through which sample gas continuously flo

1997-11-25

2000-05-30

Fox, John

Measuring and testing

Sampler, sample handling, etc.

Plural parallel systems

13762518, F16K 1106

Patent

active

06067864&

ABSTRACT:
A multiport valve system is disclosed in which sample gas continuously flows through all ports. More specifically, gas flowing to a specific port is selected for analysis, and gas continuously flows through the valve at this port during the analysis. In addition, non selected gas samples, which are defined as gas samples not currently being analyzed, continuously flow through non selected ports thereby always providing fresh samples at these ports when they subsequently become selected ports for analysis. Non selected gas is purged from the valve as waste. A positive pressure is maintain between portions of the valve containing selected gas and portions of the valve containing non selected gas to prevent contamination of the selected gas.

REFERENCES:
patent: 3765247 (1973-10-01), Riggs
patent: 4156437 (1979-05-01), Chivens et al.
patent: 4601211 (1986-07-01), Whistler

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