... flanges are all made of high quality alloy steel forging. KQ sulfur resistance oil (gas) extraction wellhead equipments are designed ... . Meantime, the equipment has performance of sulfur-resistance.The KQ series wellhead equipment consists of bottom flange, top flange, ... : natural gas, crude oil, waterconnection type : clamp or flange KQ Sulfur Resistance Oil(gas) Extraction Wellhead Equipments