... 2000-20000psi4 7-1/16"-21-1/4"Hydraulic Ram BOP * API dual-ram BOP , BOP Hydraulic ram BOP of wellhead equipment* Bore size: 7-1 ... can be used to replace Shaffer ram BOP, Cameron ram BOP, or Hydril ram BOP.Hydraulic BOP ramadopts hydraulic pressure to close and open the ram ... independently, and it also can be used with other BOP.The hydraulic ram BOP is equipped with various types of pipe rams, which ...