The KTN 56B is our wafer ends double disc check valve. Made of cast iron GG25, The range of dimensions is from DN 50 to DN 300. The pressure range is PN10 / 16. PTFE bearings. Double disc, spring and axis in stainless steel AISI316, Groove vulcanized nitrile seats. Indicated to retain the fluid of aqueous media, oil and gas.