Iron safety valves with extra high capacity for industrial use. The valve is cast iron with bronze nozzle, disc, and guide. A large seat area/guide area ratio, along with disc pivot design insures top valve performance. Flat bronze valve seats are lapped for optimum performance. Reversible lift lever or "pull-up" or "pull-down" manual testing. Every valve is tested and inspected for pressure setting and leakage. All adjustments are factory sealed to prevent tampering or disassembly.