Self-Balancing Boiler Feed Pump

New structure, stable, reliable

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Medium and Low pressure pump

TECHNICAL DATA


DN:40-200mm


FLOW:3.75~335 m/h


Head：92~760m


Motor Power: 7.5～500kw
 

Sub-High Pressure Pump

TECHNICAL DATA


DN:65-220mm


FLOW::17.4-336m3/h


Head：92~760m


Motor Power: 75-1250kw

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Application&Materials

Model

Applicable media

Texture of material

DGP

20~160℃ Pure water

Flow passage parts material: cast iron

Advantages

•New structure

It has rotor component with symmetrical arrangement of impellers which can make the axial impulse of the positive and reverse groups of impellers counteract with each other, thus not needing balancing disc device with small gap, high voltage drop, easy erosion, easy abrasion and fault liability and making breakthrough to the traditional structure of multi-stage pump.

New technology

It has unique throttling, relief fitting and odd level balancing device,  it can also play the role of auxiliary  supporting.

High efficiency and energy-saving

It uses advanced hydraulic model which is the highly efficient energy-saving product independently researched&developed by our R&D.Because the pump rotor has no abrasion and axial pulsating movement of balancing disc, the centering between the impeller and guide vane is always in best condition, and the efficiency of it will not remarkably decrease along with abrasion of balancing disc and forward movement of rotator part as the general multi-stage pump.Furthermore, the water leakage has been eliminated to reduce the volume loss, the operating efficiency of the pump has been improved on the whole and shaft power has been reduced, the efficiency is 2%~3% higher than general multi-stage pump in average.

High Reliability

The auto-balancing axial load reduces the abrasion of the pump and interference of the system to minimum level. An extremely small   part of the axial force is borne by thrust bearing. Thus the pump shaft is always under the tension state and the shaft has an even stress and strain state.  In addition, the peak value stress has been remarkably reduced as compared with the original model, which increase the rigidity and critical rotation speed to improve the stability & reliability of the pump rotor remarkably.

High stability

The pump can still maintain high level of stability and high operation efficiency after long time of operation through the best matching between symmetric impellers and guide vanes as well as the proper matching gap and wider axial throttling design.

 

Good cavitation performance

Apart from optimized hydraulic model and structural design and  special severed head impeller double suction structure, it has also precise casting and reliable abrasion resistant material,therefore,

the pump has good anti-cavitation performance,the complete  appliance operates stably with low noise and it is unnecessary for the user to additionally equip other fore pump or lift the height of the inlet water tank.

 

Even characteristic of thermal expansion(contraction)and good symmetry

The pump has even characteristic of thermal expansion(contraction) between left and right side, up and down and it has  good symmetry, therefore, it has successfully avoided the water  leak problem among the stages due to thermal expansion(contraction).

 

Low maintenance rate

Adopting precision casting to reduce the wearing parts and maintenance dismounting times so as to prolong the product service life and save the overhaul and check time, in addition,  series of problems due to excessive dismounting has been  reduced to maximum extent and maintenance cost has been  reduced by using.

Strong applicability

It uses advanced combined modularization design, and the local components which have undergone the great quantity of use and long period of application have high  level of interchangeability.

It has eliminated small gap balancing disc device, which can adapt to worse medium case as compared to traditional structure.

                   Performance Range

DGP low&medium pressure 50HZ

DGP low&medium pressure 60HZ

DGP Sub-high pressure 50HZ

DGP Sub-high pressure 60HZ

 

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