Sealing safety device for filling fuel tank comprises annular joint surrounding filling gun and elastomer valve comprising annular lip, which only opens to create passage to atmosphere in event of overpressure in tank

摘要

The elastomer sealing safety device (6) for filling a tank by means of a gun (5) comprises an annular joint (12) which surrounds the gun and opposes the exit of gas out of the tank. There is also a valve (15) which only opens to create a passage to atmosphere (17) in the event of an over pressure in the tank. The valve is an annular lip in an elastomer material with one end fixed to the device and the other end supported by an elastic force on a rigid element (71) edging the passage.