... be locked manually 3. ISO/Enviroment certificated Annular BOP /Annular Blowout PreventersHydraulic ram BOP adopts hydraulic pressure to close and open the ... , and it also can be used with other BOP.ApplicationThe hydraulic ram BOP is equipped with various types of pipe rams, ... valve, mud gate valve, chock valve, check valve) 3) Bop(Annular/Ram BOP) We are a API/ISO certified enterprise→Head office ...