... simple construction 4.Compact body saves space Spherical blowout preventers (API 16A series) Working path ( mm ) 180,230,280,346, ... , P, R, S, T, UProduct specification level PSL1, PSL2, PSL3Product performance level PR1, PR2Working medium can be hydrogen sulfide ... fluid Detailed description *Spherical blowout preventers are compact, annular type BOPS which seal reliably on almost any shapeor size – ...