Blowout preventer accumulator unit is special equipment, which is used to control Bop, hydraulic chock, kill system and diverter equipment, and indispensable equipment for blowout preventer during drilling or workover in petroleum and natural gas industry.

The function of the blowout preventer accumulator unit for surface mounted Bop stacks is preparing and prestoring enough hydraulic oil and controlling its flow direction, in order to open or close Bop quickly. As the hydraulic oil used, the pressure drops down, when the pressure lowers to a certain value, the blowout preventer accumulator unit will renew the hydraulic oil automatically to keep the pressure in a certain high value.