... high quality alloy steel forging. KQ sulfur resistance oil (gas) extraction wellhead equipments are designed and manufactured in ... all made of high quality alloy steel forging. For the sake of safety,non-destructive inspection and ... valve, small cross, stop valve, gauge and other parts, etc.Applicable medium : natural gas, crude oil, waterconnection type : clamp or flange KQ Sulfur Resistance Oil(gas ...