... construction 4.Compact body saves space Spherical blowout preventers (API 16A series) Working path ( mm ) 180,230,280,346,426,540Working ... AA, BB, CC, DD, EE, FFWorking temperature of L, P, R, S, T, UProduct specification level PSL1, PSL2, PSL3Product performance level ... drilling tool, can fully closed wellhead. Spherical Blowout Preventers (API 16A series)