| 摘要 |
Second-stage valve for a breathing-gas regulator for an air aqualung for underwater activity, of the type comprising a chamber which houses the stem of an open/close element that is pushed permanently in a direction of closure against the seat of the breathing-air release valve by a spring, the free end of this stem being connected to a lever that works in conjunction with a constant-pressure diaphragm and that opens said valve in opposition to the action of said spring, said valve being characterized in that said chamber comprises a thin metal inner liner coated with a coating of plastic or composite material.
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