... , WY, WL series reciprocating vacuum pump.Vacuum pump accessories: impeller,disc, the pump cover, pump body materials can be chosen as ... (0Cr17Ni12Mo2)SUS316L (00Cr17Ni14Mo2)Pump shaft materials:2Cr13, SUS304 and SUS316LMechanical seal uses imported products, Seals can use viton or PTFE ... .2BV2 - Ex, 2BV6 series water ring type vacuum pump/compressor is ...