The C valves are the first valves produced by Dott. Ing. Mario Cozzani s.r.l. with concentric metal rings and steel guides. Mainly applied for lubricated use, they are still valid and suited for particular working conditions and gas, such as cryogenic or high compression ratio applications where elevated temperatures are reached.
Special treatment or surface protections (such as Xylan®, Nitriding and others) are used on the valve seat and guard, making them suitable also for dry or mini-lubricated conditions.