JOHN GJERDE

VALVES OF METAL NOT BEING PARTS OF MACHINES, INCLUDING VALVES FOR SHIPS, VESSELS AND FLOATING INSTALLATIONS, AIR VENTILATION VALVES ALLOWING TANKS TO BREATH DURING FILLING, DRAINING, VOLUME DISPLACEMENT AND VOLUME VARIATIONS CAUSED BY THERMAL CHANGES, AND PREVENTING INGRESS OF SEAWATER ON SERVICE TANKS CARRYING BALLAST, FUEL OIL, LUBRICATED OIL AND/OR DRINKING WATER; VALVES OF COMMON METAL NOT BEING PARTS OF MACHINES