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HW-440 Pump can be widely used in all kinds of works in oil field. When the cylinder liner specification

is 6"-3 1/2", piston structure is recommended and it is suitable for Oil-Well Repair and shallow-well

drilling, etc. When the cylinder liner specification is 3 1/4"-2", axial piston structure is recommended

and it is suitable for high-pressure work. 

 

The Pump stand  is constructed of steel plates by welding. Furthermore, because the post weld

annealing treatment is applied to eliminate the internal stress, its strength is high and its steel is good.

Moreover, the strengthening plate structure is adopted in the crank shaft bearing house and the main

bearing house, therefore its strength is high and its steel is good.

 

The crank shaftis constructed of forgings in balance, and thus it is light in weight and it runs smoothly

without any vibration. 

The gear shaftis made of forgings of alloy steel and the herringbone gear as a whole is installed with

medium hardness tooth surface gear on the shaft. 

 

The cross headis made of ductile cast iron by entire cast which thus makes the wear-resistant good.

The guide plate is formed in up- and - down structure which thus can adjust the concentricity by the

gasket in the up or the down gasket. 

 

The hydraulic cylinderis made of alloy steel cast in straight-through type and its volume small and

volumetric efficiency high. Furthermore, the surface of the cylinder has been treated with chemical

nickel-plating to enhance its wear-resistant. 

 

The cylinder linersof the HW440 pump have a same sized external diameter. The fasten effect is

achieved by the squared cylinder liner pressing cover and the bolt pressing the hydraulic cylinder. The

seal between the cylinder liner and the hydraulic cylinder is achieved by the rubber mat in rectangle. 

 

In the lubrication system, the forced lubricating is adopted. The gear oil pump, which is installed in

the oil rank, transmits the pressured oil, through lubrication lines, into the cross head guide plate and

all the shafts to achieve the forced lubrication and cooling purpose.