wellhead equipment working pressure: 2000~15000psi nominal size: 2 1/16~4 1/16 PSL1~4, AA~FF,PR1, P.U connect: flange, ... clamp wellhead equipment 1.Fix drilling wellhead, connect wellhead casing string, seal and control ... , and apply to acid fracturing, water injection and test service 2.Consist of casing head, tubing head and Christmas tree 3 ...