Disassembly process of piston pump

 

On the premise of ensuring sufficient preparation, the disassembly of the piston pump should be strictly carried out according to the steps to ensure smooth operation and ensure the safety and efficiency of each step.

 

Preparation and steps for disassembly

 

Firstly, turn the crosshead to the bottom dead center position, then use two wrenches to apply symmetrical force 180 ° apart, unscrew the side pillar nut, and be careful to prevent the side pillar from bending.

 

Lift the upper crosshead, side pillar, and plunger vertically upwards together and remove them from the packing box.

 

Use a plunger bracket to firmly support the lifted plunger.

 

Unscrew the connecting bolts between the crosshead and the plunger, and then remove the side pillar, upper crosshead, plunger head, plunger ring, and other components.

 

Remove the connecting bolts of the connecting rod big end, separate the connecting rod from the crankshaft, and then lift out the crosshead and connecting rod one by one from the crankcase.

 

After these steps, it is necessary to remove the crosshead pin shaft, retaining ring, and locating pin to separate the connecting rod from the crosshead. Then loosen the coupling connected to the gearbox, remove the fixing nuts of each crankshaft bearing, and take out the main bearing cover and half coupling. Afterwards, remove the crankcase covers at both ends of the crankcase and lift the crankshaft out of the crankcase. Remove the end cover of the cylinder block and use specialized tools to remove the valve components of the discharge valve and suction valve one by one.

 

 

Finally, completely remove the cylinder block from the crankcase.

 

 

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Quality Standards and Maintenance of Components

 

The next thing to focus on is the quality standards and maintenance of the components. Ensure that each disassembled component meets the predetermined quality standards, and promptly repair or replace any components that do not meet the standards to ensure the overall performance and safe operation of the equipment. At the same time, regular maintenance and repair of various components, timely detection and resolution of potential problems, are also key to ensuring long-term stable operation of the equipment.

 

Cylinder block and crankcase

 

The cylinder body of the plunger high-pressure pump must be carefully inspected during each maintenance. This includes visual inspection, magnifying glass inspection, and staining inspection. The upper and lower planes of the cylinder block serve as the measurement reference during machining and assembly, with a parallelism tolerance of 0.015mm/100mm and a surface roughness not exceeding Ra3.2. The cylinder body also needs to undergo a hydrostatic test, with a test pressure of 1.25 times the operating pressure. In addition, the tolerance for cylindricity and roundness of the inner holes for installing the suction valve and discharge valve is 0.05mm, and the roughness of the groove is not higher than Ra12.5.

 

For the crankcase, the slide hole must be kept perpendicular to the upper end face, with a tolerance of 0.015mm/100mm for verticality. At the same time, the two sides of each crankshaft tile seat protrusion in the crankcase must be kept parallel, with a tolerance of 0.01mm/100mm for parallelism, and a tolerance of 0.05mm for the center of each protrusion.

The above: Reasons for insufficient flow of piston pump and solutions