detailed description @Can complete with different (pneumatic) hydraulic safety valve. @Design with assembling and disassembling dual tubing hanger quickly. @One well bore can exploit two different strata at the same time, and can control and operate separately. @ Compact configuration, convenient operation, reliable seal. @Apply to all kinds of casing and tubing program. @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