detailed description @Fix drilled wellhead, connect wellhead casing string, seal and control the annular of casing, suspend tubing, control wellhead pressure and adjust flow rate, also include oil into outlet pipeline, shut off oil well when necessary, and apply to acid fracturing, water injection and test service. @Consist of casing head, tubing head and Christmas tree. @Apply to all kinds of casing, tubing programs and connection forms. @Feature reliable running, simple and convenient operating and repairing. @Can be equipped with (pneumatic) hydraulic safety valve. @Working pressure 2000PSI~20000PSI @Working medium: oil, natural gas, mud ,including H2S,CO2 @Working temperature: -46°C~121°C(Class LU) @Material class: AA,BB,CC,DD,EE,FF ,HH @Specification level: PSL 1-4 @Performance level: PR 1-2