Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element is fluid pressure sensitive
Patent
1991-01-31
1992-09-22
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Control element is fluid pressure sensitive
422 26, 422 33, 422114, 422113, 422295, A61L 200, G05D 1600
Patent
active
051495074
ABSTRACT:
The application is directed to methods and apparatus for venting a pressurized sterilizer chamber having a liquid load within it. A sterilizer chamber is provided with a pressure sensor for sensing the chamber pressure and a vent channel with an associated vent valve. The vent valve is opened to vent pressure from the chamber, and has an orifice providing a maximum flow coefficient substantially larger than a standard bleed valve. A microprocessor-based sterilizer controller monitors chamber pressure and opens and closes the vent valve. The venting phase is regulated by means of a series of vent cycles. An individual vent cycle is intiated by starting a software timer to time a preset interval. The controller records a starting chamber pressure and opens the vent valve. The controller monitors the chamber pressure, and when the pressure has dropped from the starting pressure by a selected maximum amount, closes the vent valve until the timer interval has elapsed. If the maximum pressure drop is not achieved in the given interval, the vent valve remains open as the next vent cycle is started.
REFERENCES:
patent: 3088180 (1963-05-01), Lauterbach
patent: 3246947 (1966-04-01), Castle
patent: 4309381 (1982-01-01), Chamberlain et al.
patent: 4759909 (1988-07-01), Joslyn
patent: 4781898 (1988-11-01), Jones
patent: 4971764 (1990-11-01), Albright
MDT Corporation
Trembley T. A.
Warden Robert J.
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