1. All pressure bearing parts and flanges are made of high-quality alloy steel forgings and have undergone non-destructive testing.
　　2. The gate valve, valve seat and needle of needle valve are all made of heap (spray) welding cemented carbide.
　　3. The main parts of oil and gas production wellhead have good sulfur resistance after special heat treatment.
　　4. The sealing elements are made of PTFE, fluororubber and other sulfur resistant materials.
　　5. The wellhead of oil and gas production is simple in structure, light in weight and reliable in operation.

　　Structure, performance and characteristics of wellhead equipment for oil and gas production?
　　The wellhead equipment for oil and gas production is of double cam structure. The valve adopts the commonly used parallel gate structure. The valve body, valve cover, valve plate and valve stem are made of materials with good high temperature creep resistance. Therefore, the whole valve can withstand the high temperature of 380 ℃. Under the high temperature and high pressure, the opening and closing of the valve will not produce deformation. The non-metallic seals are made of high temperature resistant materials. At the temperature of 380 ℃ The sealing performance is good.