Samuel J Richard

US Patent:

42744407, Jun 23, 1981

Filed:

Dec 29, 1978

Appl. No.:

6/000368

Inventors:

Samuel J. Richard - South Charleston WV

International Classification:

G05D 1600

US Classification:

137613

Abstract:

Precision gas pressure regulation is disclosed to provide extreme sensitivity, fast response, and positive shut-off of gases for pressurizing a vessel, such as a tank, pressurized room, chamber, duct, and the like, at pressures up to about 2 inches of water column above atmospheric pressure, and as low as about 0. 25 inches of water column, with control of pressure within about 0. 02 inches of water column within a predetermined pressure within this range. The system is compact, self-contained, and requires no external source of power other than the supply pressure, which can range from about 10 Psig to 1,000 Psig. Redundant pressure relief devices are provided at all points of pressure reduction within the system for maximum safety. Means are provided to prevent condensate build up in internal components, and for uses in which toxic or corrosive gases are contemplated, a purging option permits unwanted material to be swept out of the apparatus.