... PSL1-4,PR1-2 API 6A Christmas Tree & Wellhead Equipment 1. Fix drilled wellhead,connect wellhead casing string,seal and ... pressure and adjust flow rate,also induce oil into outlet pipeline,shut off oil well when necessary,and apply to acid ... with (pneumatic) hydraulic safety valve6. Working pressure : 2000psi20000psi Working medium : oil , natural gas , mud , including H2S , CO2 Working temperature : - ...