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1.Material of Valve & Seat: 20CrMnTi forging
2.Material of Valve Inssert: NBR,Polyurethane,HNBR
3.Service Life of Valve Insert: NBR≥200 hours;Regular PU ≥200 hours;Hihg-pressure PU≥300 hours;HNBR≥400 hours
4. Deep Carburized Surface: 1.5-1.8 mm