... 4.Compact body saves space Spherical blowout preventers (API 16A series) Working path ( mm ) 180,230,280,346, ... 426,540Working pressure ( PSI ) 2M,3M,5M,10Mmain material AA, BB, CC, DD, EE, FFWorking temperature of L, ... P, R, S, T, UProduct specification level PSL1, PSL2, PSL3Product performance level ... closed wellhead. Spherical Blowout Preventers (API 16A series)