... 4.Compact body saves space Spherical blowout preventers (API 16A series) Working path ( mm ) 180,230,280,346,426,540Working pressure ... BB, CC, DD, EE, FFWorking temperature of L, P, R, S, T, UProduct specification level PSL1, PSL2, PSL3Product performance level ... element provides positive seal after hundreds of tests to full working pressureStrong, simple construction — only five major parts.Compact ...