1.The material of valve disk an the valve sealing face is the cobalt base hard alloy(stellite)that is hard,anti-attrite,themostable,anti-corrosive,the anti-abrasion.
2.The stem after the quenching and tempering and the surface nitriding,has the good anti-crrosion and anti-abrasion.
A105 gate valve(BW butt welded)
Forged steel gate valve(BW butt welded)
Forged Steel Gate Valve(NPT SW BW end)