•  It is mating equipment of hydraulic BOP and is important equipment of control blowout and oil(gas) wellhead
•  Through choke effect of choke valve to realizing press wellhead operation , instead of Polluted mud and also control wellhead casing pressure and stand casing pressure , restore mud pressure control and stop the overflow
•  Through relief effect of choke valve , reduce wellhead pressure , that to realizing soft shut-in
•  Through Large discharge of blow-off valve , reduce wellhead casing pressure and protect wellhead BOP unit
•  It is match with hydraulic control box that can remote control
•  Working pressure ：2000PSI～20000PSI
• Nominal bore ：2.1/16~4.1/16 (46mm~103mm)
•  working medium : oil , nature gas , mud
•  working temp.：-46°C～121°C（LU ）