Patent ID: 8652056
Filing Date: 2014-02-18
Classification: A61B,F16K,Y10T

Abstract:
1. A deflation control valve that automatically varies a rate of gas flow through said control valve to maintain a constant deflation rate during a deflation or exhaust of gas held in a closed pressurisable vessel to which said valve is connectable, wherein said control valve is manually adjustable to set the deflation rate, said control valve comprising: a valve body having a passage communicable with said pressurisable vessel, said valve body defining a valve chamber communicating with said passage in which a flexible diaphragm is provided partially or substantially closing said valve chamber; said diaphragm being in sealing abutment with a seat in said valve housing around a periphery of said diaphragm, and forming on an opposing side thereof a part of an exhaust chamber; said diaphragm, in use, being, on a valve chamber side subject to gas pressure in said pressurisable vessel and, on the opposing side, subject to gas pressure in the exhaust chamber, which may be atmospheric pressure; said diaphragm having an aperture or port extending therethrough, and said diaphragm on one side being in communication with said valve chamber and, on the opposing side, being in communication with said exhaust chamber or atmosphere; said diaphragm being closeable or partially closeable by a displaceable closure disc, plate or platen that is releasably held by an operable, controllable or adjustable release means in a closing position against said diaphragm to cover said aperture or port, and whereby adjusting said release means to open and closed positions or intermediate positions, controls the deflation rate at which gas flows through the valve via the valve chamber through the aperture or port in the diaphragm and between a face of the closure disc, plate or platen and the diaphragm to exhaust or atmosphere to allow gas pressure of the valve chamber to drop in a controlled manner; and wherein the closure disc, plate or platen and diaphragm have an air escape passage or means which varies in cross-section as the deformation of the diaphragm due to the pressure difference across it and the position of the closure disc, plate or platen varies.