A VALVING DEVICE IN PARTICULAR FOR ELECTROCHEMICAL GENERATORS OF SEMI-SEALED TYPE CAPABLE OF PROVING EXIT CINMUNICATION BETWEEN THE ENCLOSURE OF THE GENERATOR AND THE EXTERIOR ENVIRONMENT, THE VALVING DEVICE BEING OF A TYPE COMPRISING A HOLLOW PART HAVING A CAVITY IN COMMUNICATION WITH SAID ENCLOSURE AND THE EXTERIOR VIA ONE OR MORE EXIT ORIFICES OR PASSAGES WHICH PLACE THE ENCLOSURE IN COMMUNICATION WITH THE EXTERIOR ENVIRONMENT AND INCLUDING AN OBTURATING ELASTIC BODY LODGED IN SHCH CAVITY AND CAPABLE OF VOLUMETRIC CHANGE FOR FREEING OR CLEARING SAID EXIT ORIFICES OR PASSAGES UNDER GIVEN DIFFERENTIAL PRESSURES APPEARING BETWEEN SAID ENCLOSURE AND SAID EXTERIOR ENVIROMENT AND SEALING OR OBTURATING SAID ORFICES OR PASSAGES WHEN SAID PRESSURE DIFFERENTIAL CONDITIONS ARE NOT PRESENT. THE OBTURATING BODY LODGED IN THE CAVITY IS COMPRESSIBLE THE ELASTIC AND IS VOLUME IS VARIABLE AND DECREASES AS PRESSURE UPON IT INCREASES, BEING CONSITUTED PRIMARILY OF AN ELASTIC POROUS OF ALVEOLATE BODY WHOSE PORES OR CELLS ARE SEALED OFF AND CONTAIN GAS SUCH AS IMPRISONED AIR THAT IS COMPRESSIBLE. THE VARIATION IN ELASTIC VOLUME OF THE BODY IS OBTAINED THANKS TO THE COMPRESSIBILITY OF THE IMPRISONED GAS IN ONE OR MORE OF THE PORES OR CELLS THAT ARE BOUNDED BY ELASTIC PARTITIONING WALLS.

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