High pressure multistage water pump
Type MDG pump is single-suction, multi-stage, segmental centrifugal pump. It is used for feeding water of low-middle pressure boiler as well as pumping high lift water of factory and city. It is provided for delivering clear water or other liquid which is physically and chemically similar to clear water. The temperature of the liquid for type DG85-80 and 200DG 43 pump is -20℃~150℃, the temperature for the liquid for the others usually is -20℃~105℃. The maximum inlet pressure is not allowed more than 0.59MPa (6kgf/cm2)..
This kind of pump is horizontal installed centrifugal pump. The inlet and outlet of the pump are both vertical. The pump mainly consists of suction casing, stage casing, diffuser vane, delivery casing, stuffing box, bearing box and rotor elements. The rotor elements mainly consists of shaft, impeller, sleeve, bearing bush and balance disk, the parts that are assembled on the shaft are fixed with key and sleeve nuts. MDG85-80, MDG85-67, DG155-67 adopt sliding bearing which get lubricated with dilute oil. Others use cylinder roller bearing which get lubricated with grease except type 80DG20, 100DG20, 150DG3 and 200DG43 use dilute oil. All the pumps are supported by feet except DG85-80 and 200DG43 by pump center. Pump and motor are connected with flexible coupling.
Pump axial thrust are balanced by the balancing system in pump, which consist of balance ring, balance disk, balance bush and balance water pipe.
Shaft seal can be packing seal or mechanical seal (single end surface, non-balanced type). Customers oneself choose it.
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