2BV Liquid Ring Vacuum Pump Not Pulling Vacuum? Common Problems and Easy Fixes

If your 2BV liquid ring vacuum pump suddenly can’t reach vacuum, makes strange noise, or runs hot, you’re not alone. These issues show up a lot in real plants. The good news? Most of them are easy to diagnose and fix if you know where to look.

Below, we’ll walk through the most common 2BV pump problems, using a clear “problem → cause → solution” logic.

1. Vacuum Level Is Too Low

What you’ll notice

Vacuum does not reach the rated value

Pump feels like it’s “working hard” but results are poor

Common reasons

Not enough sealing liquid

Inlet gas temperature is too high

Air leakage in pipes or flanges

What to check

Liquid level and supply flow

Inlet temperature

All seals, gaskets, and connections

How to fix it

Adjust sealing liquid flow

Cool the inlet gas if possible

Fix leaks right away

Tip: Many “pump problems” are actually system leaks, not the pump itself.

2. Pump Body Gets Too Hot

Why it happens

Cooling water flow is too low

Circulating liquid temperature keeps rising

Simple solutions

Increase cooling water flow

Improve liquid circulation or add a heat exchanger

A hot pump usually means the liquid ring is no longer doing its job properly.

3. Loud Noise or Strong Vibration

Possible causes

Cavitation due to poor liquid supply

Worn bearings

Shaft misalignment

What you can do

Make sure liquid supply is stable

Listen for bearing noise

Check alignment during maintenance

Ignoring noise often leads to bigger failures later.

4. Water Consumption Is Too High

Main reasons

Wrong operating parameters

No water recycling system

Fix

Optimize operating pressure

Use a closed-loop liquid circulation system

This can save a lot of running cost over time.

5. Pump Is Hard to Start

Likely causes

Motor overload

Scale or dirt inside the pump

Solutions

Clean the pump regularly

Check motor and electrical system

Final Thoughts

Most 2BV liquid ring vacuum pump problems are not serious—if you act early. Regular checks, proper liquid control, and basic maintenance can keep your pump running smoothly for years.

Have you seen other issues with your 2BV pump? Drop a comment or share your experience—real cases help everyone.

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