Design Short Wafer Type Damper Valve with Metal to Metal Seat, Body Gry Iron Cast Steel Ductile Iron CF8 CF8M, Size Range 1.12" to 20", ShaftAISI 410 AISI 304 AISI 316 AISI 316L, Disc. WCB CF8 CF8M, Seat Metal to Metal, Seat Leakage 5% Leakage of full flow, Temprature -25C to 400C (Up to 600 C Depending MOC), Pressure PN 6 ( Maximum).