| 摘要 |
<p>The invention provides an exhaust valve comprising a valve body, an inlet duct in the valve body for receiving gas to be exhausted through the valve, an exhaust duct in the valve body for exhausting the said gas from the valve, and a valve member subject on the one hand to the ambient external pressure and on the other hand to the pressures in the inlet and exhaust ducts, the valve member moving according to changes in the said pressures between an open position in which there is communication between inlet and exhaust ducts for the exhaustion of gas through the valve and a closed position in which it cuts off such communication; the valve member is preferably mounted in a diaphragm. It also provides a similar valve in which the valve member is instead subject on said one hand to a predetermined maintained fluid pressure, e.g. that within a pressurized chamber. The latter valve can be used to control the pressure in an exhaust line from the exhaust valve. One or both valves can be used in a system for recovering for reuse helium employed in breathing mixtures for deep dives.</p> |
