Our Model 1210 valves are developed mainly for blow-down lines or pressurized storage vessels. External atmospheric conditions like temperature and corrosive air determine the material combination for these valves. Higher settings then most dead weight types is achieved by spring loading of pressure pallets. Standard non-metallic seat inserts are made using Neoprene and Teflon material. This range of valves are available using pure aluminum, and have cast iron body, stainless steel trim. They can also be made from other materials on special order.