I. Root Causes and Solutions for Insufficient Pump Output Pressure

When pressure is insufficient, first investigate the power source. Insufficient motor power may be due to an undersized selection or a motor fault itself; recalculation and replacement are required. An excessively large pump displacement or an overly high pressure setting can also overload the drive unit. The pressure, flow, and power parameters should be re-matched accordingly. Additionally, an improperly set relief valve can prevent pressure from building up and needs inspection and adjustment.

II. Underlying Causes of Pressure Fluctuation and Unstable Flow

1. Aeration and Oil Contamination

Periodic pressure fluctuations are often caused by air ingestion, such as from leaking pipes, low oil levels in the tank, or a clogged suction filter. Contaminated oil can cause vanes to stick in the rotor slots, leading to uneven displacement. The oil should be filtered or replaced immediately.

2. Assembly Precision and Clearance Matching

The fit clearances of internal components directly affect stability:

- Excessive clearance between the vane and rotor slot allows high-pressure oil to leak to the low-pressure chamber; too little clearance causes the vane to stick.

- Excessive clearance between the plunger and cylinder bore increases internal leakage.

The unit needs to be disassembled, cleaned, and the clearances measured and reconditioned to specified values. For rotor pumps, special attention must be paid to adjusting the eccentricity between the rotor and stator to minimize flow pulsation.

3. Auxiliary Pump Failure

Wear or damage to the auxiliary pump in a non-self-priming pump system can lead to insufficient oil supply to the main pump. The auxiliary pump should be repaired or replaced.

(Bonve Pumps Cam Rotor Pumps)

III. Multiple Factors in Abnormal Pump Heating

1. Friction Heat Generation from Improper Assembly

Excessively small clearances are a primary cause of heating: when clearances for components like the plunger and cylinder bore, vane and rotor slot, or gear and side plate are below the lower limit, severe friction occurs during operation, potentially leading to scoring. Reconditioning to the correct clearance is necessary. Poor assembly coaxiality causing binding requires realignment. Low-quality bearings or those damaged during assembly will also generate heat and should be replaced, ensuring components are cleaned beforehand.

2. Deficiencies in Return Line Design

Poor drainage of bearing lubrication oil, such as an unopened return port plug, blocked oil passages, excessive bends, or crushed pipes, leads to heat accumulation. Pipelines should be cleared, bends reduced, and pipe diameters increased where necessary.

3. Oil Quality and System Matching

Oil with poor viscosity-temperature characteristics, water contamination, or particulate pollution destroys lubrication. Conforming hydraulic oil must be selected and changed regularly. Suction or drain lines that are too small increase resistance or cause excessive internal casing pressure; pipe diameters should be recalculated.

4. External Heat Sources and Internal Leakage

High ambient temperatures or poor heat dissipation require heat shielding. Wear inside the pump leading to low volumetric efficiency converts high-pressure oil energy into heat; worn components or the pump core should be replaced.

Conclusion

Pump pressure instability and heating often result from a combination of factors. From assembly clearances to oil maintenance, and from piping design to the external environment, every link must be strictly controlled. Systematic troubleshooting is essential for efficient hydraulic system operation.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.