Inlet Sizes : 1/1/2 to 6″
Inlet Ratings :ANSI Class 600 to 4500
Outlet Sizes : 3″ to 10″
Outlet Ratings : ANSI Class 150 and 300
Orifice Sizes : Eleven sizes – 1 through RR
Set Pressure Range : 100 psig to 5360psig
Temp. Range : Up to 1120◦ F
Materials : Alloy and carbon steel cast body with stainless steel trim
Source : http://www.geoilandgas.com/pipeline-storage/gas-production/safety-valves