Vent valve

Claim 1

A VALVE UNIT OPERABLE TO CONTROL THE FLOW OF LIQUID AND GAS FROM A CLOSED TANK COMPRISING (A) A BODY HAVING AN INTERNAL WALL FORMING AN AXIAL PASSAGE AND A SHOULDER PROJECTED INTO THE PASSAGE, SAID BODY BEING ADAPTED FOR ATTACHMENT TO THE TANK WITH SAID PASSAGE OPEN AT ONE END TO THE INTERIOR OF THE TANK AND OPEN AT THE OPPOSITE END TO THE EXTERIOR OF THE TANK, (B) A MEMBER HAVING AN OPENING CONCENTRICALLY POSITIONED IN SAID PASSAGE BELOW SAID SHOULDER AND SECURED TO AN INTERIOR PORTION OF THE BODY, (C) A VALVE ASSEMBLY CONCENTRICALLY POSITIONED IN SAID PASSAGE BETWEEN SAID SHOULDER AND SAID MEMBER FOR MOVEMENT TOWARD AND AWAY FROM SAID MEMBER TO CLOSE AND OPEN THE OPENING THEREIN, (D) MEANS ENGAGEABLE WITH THE BODY AND VALVE ASSEMBLY FOR BIASING THE VALVE ASSEMBLY TOWARD SAID MEMBER TO CLOSE THE OPENING THEREIN, SAID VALVE ASSEMBLY BEING MOVED TO OPEN SAID OPENING IN RESPONSE TO EXCESSIVE LIQUID OR GAS PRESSURE IN THE TANK, AND (E) SAID VALVE ASSEMBLY INCLUDING A FIRST DISC VALVE HAVING AN OPENING CONCENTRICALLY POSITIONED IN SAID PASSAGE AND ENGAGEABLE WITH SAID BIASING MEANS, SAID FIRST DISC VALVE HAVING A PLURALITY OF FINGERS LOCATED ADJACENT THE INTERNAL WALL OF SAID BODY AND EXTENDED TOWARD SAID SHOULDER, SAID FINGERS BEING OF A LENGTH