Patent ID: 7445020

Claim:
A relief valve assembly which can be equipped for either vessels carrying oils or chemical products or for chemical tanks to safely release pressure gas (supersaturated gas) inside of the tank out into the air, the relief valve assembly comprising: a lower body ( 10 ) which is fixed through the tank; an upper body ( 20 ) in which a rib ( 22 ) is integral with a boss ( 23 ) having a screw hole for assembling a screw part ( 61 ) of a stem ( 60 ) and with which a disc seat ( 21 ) is assembled; a stopper ( 62 ) which is fixed to a top part of the stem ( 60 ) by a cap nut ( 63 ); a lifting disc ( 30 ) which has a ring ( 33 ) at a lower side of the lifting disc, a protruding stage ( 34 ) contacting the disc seat ( 21 ) of the upper body ( 20 ) and a closing valve, a first hole ( 32 ) penetrated by the stem ( 60 ) and a second hole ( 31 ) in which the stopper ( 62 ) assembled with the stem ( 60 ) can move by the cap nut ( 63 ), and the stem ( 60 ) guides the lifting disc ( 30 ) to move up and down, and; a weight ( 40 ) which is assembled with the lifting disc ( 30 ) by a bolt ( 80 ); a weight cover ( 70 ) which protects the weight ( 40 ) and provides space inside to enable assembling an assist weight ( 90 ) and; a housing ( 50 ) which is assembled with the upper body ( 20 ) and leads releasing gas upwards out in a vertical direction and; a water (sea water or rain) drain part ( 3 ) which is assembled by passing through a flange ( 20 - 1 ) of the upper body and a flange ( 10 - 1 ) of the lower body and drains water (sea water or rain) gathering inside of the housing ( 50 ) to outside and; a vacuum relief valve ( 5 ) which is assembled with the lower body ( 10 ) and functions to build up atmospheric pressure inside of the tank.