Patent ID: 6772785
Filing Date: 2004-08-10
Classification: A62B,F16K,G05D,Y10T

Abstract:
A pilot operated demand valve for supplying breathable gas from a gas supply to a breathing apparatus comprisinga body having a connection adapted to be connected to a facepiece, hood or helmet of the breathing apparatus, main valve means responsive to pressure within a chamber in the body for selectively supplying gas from said gas supply to said connection, pilot valve means for regulating the exit of gas from the chamber, the pilot valve means comprising, a pilot jet having a predetermined jet area formed in a planar surface of the body, an operating lever having a projection with an area larger than the jet area, the lever pivotally engaging said surface along a line spaced from said jet for pivoting movement to and from a closed position in which the control projection overlies and closes the jet, and resilient spring means urging the lever toward the closed position.