Viking Corp. has introduced the 8-inch Model F-1 Deluge and Model J-1 Flow Control Valves. The valves are UL and cUL listed and FM approved for deluge, preaction and refrigerated area systems. They have a rated working pressure of 250 psi (1,724 kPa). Features include a Cv factor of 1,500 and Equivalent Length of 57 feet. At velocities of 20 feet per second and 32 feet per second, pressure losses are approximately 4.5 psi and 10.9 psi, respectively. Viking Corp.