| 摘要 |
The device comprises a first valve ( 35 a) and a second valve ( 35 b) each comprising a chamber ( 13 a , 13 b) communicating via an admission orifice ( 19 a , 19 b) with a circuit or a receptacle containing a first or a second fluid, and via an exhaust orifice ( 18 a , 18 b) with exhaust means for the first or the second fluid, at least one valve member ( 20 a , 20 b) mounted to move within the valve chamber ( 13 a , 13 b) between a position for closing and a position for opening the exhaust orifice ( 18 a , 18 b), a piston ( 22 a , 24 a , 22 b , 24 b) connected to the valve member ( 20 a , 20 b) and resilient return means ( 32 a , 32 b) for returning the valve member ( 20 a , 20 b) to a closed position. Each of the first and second pistons ( 22 a , 24 a , 22 b , 24 b) has a first face exposed to one of the first and second fluids, and an opposite second face subjected to a force exerted respectively by the second fluid or by the first fluid.
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