| 摘要 |
<p>A gas regulator/valve device particularly for use in emergency escape breathing apparatus, and comprising a T-shaped regulator piston (10) which is movable in a stepped bore (11/12) and has a nylon seat (8) for closing a jet (7) which receives the input (high pressure) gas. Movement of the piston by the input gas from a cylinder (not shown) is balanced by a spring (15). An annular groove (23) is located in the narrow section (12) of the bore on the remote side from the input gas pressure of an O-ring seal (14). As cylinder gas is used up, the piston moves upwards and eventually will expose the groove (23) to the input gas. Thereupon, gas flows through passages (24, 25, and 26) and actuates a whistle (21) or a pressure transducer. A valve assembly for gas regulators is also described. This comprises a piston member (32) which is releasable by means of a pin (40) to move upwards, under pressure from the regulator output, so as to expose a passage (35) which opens into the output port (30). The valve is intended to be difficult to close, having once been opened.</p> |
