The CDL series is a vertical multistage centrifugal pump equipped with a standard motor as standard. The motor shaft is directly connected to the pump shaft via a coupling at the pump head. The overall structure uses tie rod bolts to securely fasten the pressure-resistant cylinder and flow components between the pump head and the inlet/outlet sections. The inlet and outlet ports at the bottom of the pump body are aligned on the same straight line. This pump can also be optionally equipped with an intelligent protector to effectively prevent faults such as dry running, phase loss, and overload.