| 摘要 |
A first stage pressure regulator for a two-stage underwater breathing apparatus, comprises a second movable wall ( 16, 18 ) for separating a balance chamber ( 10 ) from an ambient exposed chamber ( 17 ) . The second movable wall is formed by a disk-shaped piston ( 16 ) which is slideably and non sealingly guided along the peripheral walls that delimit the balance chamber ( 10 ), and by an elastically deformable diaphragm ( 18 ) , which overlies the side of the piston ( 16 ) facing forward the ambient exposed chamber ( 17 ) . The elastically deformable diaphragm ( 18 ) forms with said piston ( 16 ) a diaphragm type pressure relief valve ( 20, 318 ).
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