Abstract: A valve for a floating roof emergency drainage system for draining fluid accumulated atop the floating roof, including a valve body having a top part having a cylindrical bore of first diameter, a bottom part formed by a circumferential wall which extends axially downward from the top part and defines within the wall a cylindrical bore of second diameter that is generally coaxial with and greater than the first diameter, thereby defining at the junction of the top and bottom part bores a downward facing shoulder which serves as a valve seat, the circumferential wall of the bottom part having at least one fluid discharge passage extending transversely therethrough for discharge of the fluid from the valve, a valve seal element axially movable in the bottom part bore between an upper closed position where it abuts the shoulder, and a lower open position spaced axially downward from the upper closed position, and a spring mounted in the bottom part and constantly biasing the valve seal element toward the upper c

Abstract: A valve for a floating roof emergency drainage system for draining fluid accumulated atop the floating roof, including: a. a valve body having: i. a top part having a cylindrical bore of first diameter, ii. a bottom part formed by a circumferential wall which extends axially downward from the top part and defines within the wall a cylindrical bore of second diameter that is generally coaxial with and greater than the first diameter, thereby defining at the junction of the top and bottom part bores a downward facing shoulder which serves as a valve seat, b. the circumferential wall of the bottom part having at least one fluid discharge passage extending transversely therethrough for discharge of the fluid from the valve, c. a valve seal element axially movable in the bottom part bore between (i) an upper closed position where it abuts the shoulder, and (ii) a lower open position spaced axially downward from the upper closed position, and d.