75, 1/2" x 3/4" STRAIGHT STEAM MAIN AIR VALVE Vendor_Albany Pump • Model 51 can be

• Model 51 can be field upgraded with a No

• Maximum boiler pressure 25 psi (1

McDonnell & Miller 193 Series Data Sheet

• Precision Spur Style Gears

McDonnell & Miller 221 Series Data Sheet

75, 1/2" x 3/4" STRAIGHT STEAM MAIN AIR VALVE Vendor_Albany Pump • Model 51 can beModel 75 Part No. 401434 Air Valve (non vacuum) Float type thermostatic vent For medium and large systems Single non adjustable port 12" NPT female and 34" NPT male straight shank Maximum operating pressure* Model 75 3 psig (0. 2 bar) Model 75H 10 psig (0. 7 bar) Maximum pressure 15 psig (1. 0 bar) *Drop away pressure (maximum pressure against which the vent can open). Hoffman 75 Air Valve Data Sheet