CDL/ CDLF is a kind of vertical non-sclf primingmultistage centrifugal pump, which is driven by a stan-clard electric motor. The motor output shaft directly con-nects with the pump shaft through a coupling.The pres-sure-resistant cylinder and flow passage components arefixcd bctwccn pump hcad and inlct & outlct scction withstay bolts. The inlet and outlet are located at the pumpbottom at the same plane. This kind of pump can be equ-ipped with an intelligent protector to effectively preventit from dry-running, out-of-phase and overload.