The 2BV liquid ring vacuum pump is a widely used industrial vacuum equipment in chemical, pharmaceutical, food packaging, mining and papermaking industries. It features stable operation, simple structure, low maintenance cost and strong corrosion resistance. In long-term continuous industrial operation, improper daily maintenance, pipeline aging and part wear will cause various operational failures of 2BV water ring vacuum pumps. To help global buyers, equipment maintenance engineers and after-sales staff quickly locate problems and eliminate malfunctions, this article sorts out7 common faults of 2BV liquid ring vacuum pumps and professional elimination methods as below.
1. Motor Fails to Start With No Sound
Fault Cause: The core reason is the breakage of two or more power supply lines of the vacuum pump motor, resulting in no power input to the motor.
Troubleshooting Method: Check the whole motor wiring circuit comprehensively, fix broken power cables and loose wiring terminals, and re-lock all wiring interfaces after circuit inspection.
2. Motor Fails to Start With Humming Noise
Main Fault Causes
Partial circuit disconnection causes motor rotor locked rotor;
Impeller deformation, blockage or assembly abnormality;
Motor bearing wear, jamming and aging failure.
Elimination Solutions
Drain residual liquid inside the pump body, clean internal dirt and impurities, and calibrate standard impeller assembly clearance;
Replace damaged, corroded and deformed pump impeller;
Remove old faulty bearings and install brand-new matched motor bearings.
3. Current Circuit Breaker Trips When Pump Starts
Fault Root Causes
Motor winding short circuit and internal circuit damage;
Overload operation of 2BV vacuum pump;
Excessive exhaust pressure beyond rated pump parameter;
Excessive injected working liquid volume.
Troubleshooting Methods
Detect motor winding integrity and repair short-circuited winding parts;
Reduce actual operation load of the vacuum pump to match rated parameter;
Adjust pipeline valve to lower exhaust pressure to standard working range;
Drain redundant working liquid and control liquid injection volume.
4. Pump Fails to Generate Vacuum Pressure
Common Failure Causes
No working liquid supplied inside the pump cavity;
Severe air leakage of the whole vacuum pipeline system;
Wrong motor rotation direction after wiring.
Fixing Measures
Inspect working liquid supply pipes, eliminate pipe blockage and replenish qualified working liquid;
Check all pipeline interfaces, weld seams and valve parts, repair and seal all air leakage points;
Swap two power supply wires to correct motor rotation direction.
5. Low Vacuum Degree of 2BV Water Ring Vacuum Pump
Influencing Causes
Selected pump model is too small to match system vacuum demand;
Insufficient working liquid flow rate;
Over-high temperature of circulating working liquid;
Internal pump parts suffer long-term erosion and wear;
Slight air leakage of the vacuum pipeline system;
Mechanical seal failure and sealing surface leakage.
Corresponding Elimination Methods
Replace a larger-specification 2BV vacuum pump to meet production vacuum requirements;
Adjust liquid supply valve to increase working liquid flow rate;
Install cooling device for circulating liquid, lower liquid temperature and optimize liquid flow;
Replace worn vulnerable spare parts including impeller and pump body lining;
Check pipeline loopholes and fix slight system air leakage;
Inspect mechanical seal and replace aging sealing components.
6. Sharp Abnormal Noise During Pump Operation
Fault Causes
Cavitation phenomenon occurs inside the 2BV liquid ring vacuum pump;
Excessively high working liquid flow rate.
Solutions
Install and connect cavitation protection pipeline to eliminate pump cavitation;
Detect liquid supply pipeline parameters, adjust control valve and reduce working liquid flow.
7. Excessive Power Consumption of Vacuum Pump
Fault Cause: A large amount of dirt, scale and sediment accumulate inside the pump cavity and liquid pipeline, increasing pump operation resistance and motor load.
Troubleshooting Method: Shut down the equipment safely, disassemble the pump body properly, clean internal scale, sediment and residual impurities thoroughly, and restore smooth internal pump flow channel to reduce operating power consumption.
Conclusion
Most faults of 2BV liquid ring vacuum pumps come from improper liquid supply, wiring errors, part wear and pipeline air leakage. Regular daily inspection of working liquid temperature, flow, motor circuit and sealing parts can greatly reduce equipment failure rate. This troubleshooting guide helps overseas industrial clients realize fast after-sales maintenance, cut equipment downtime and maintenance cost of 2BV water ring vacuum pumps.
