FIELD: transport.
SUBSTANCE: pressure relief valve 60 container with fluid comprises, in fact, conical body 50 extending there inside and converging inward from container outer wall, at least one air inlet 62 in on fact conical body and flexible diaphragm 53 extending above said conical body and secured thereat around, in fact, said conical body. Said diaphragm has central orifice surrounding, in fact, conical body above air inlet to seal it unless pressure inside said container fall below preset level.
EFFECT: ruled out air suction through fluid discharge opening and fluid discharge.
6 cl, 14 dwg
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