Liquid ring and dry screw are two widely used vacuum technologies for industry — choose based on gas type and the vacuum level required. See the overview at the vacuum pump page.
Liquid Ring Vacuum Pump (liquid ring)
Uses a rotating liquid ring as the compression medium — handles moist gas, dust, and mild corrosives well, with low risk of damage when liquid carry-over occurs. Vacuum down to approximately 33 mbar abs. Requires a water supply; recirculation is possible to conserve water.
Dry Screw Vacuum Pump (dry screw)
Two non-contacting screw rotors, no oil or water in the pumping chamber — delivers clean exhaust gas and achieves deep vacuum. Suitable for food, pharmaceutical, and electronics applications requiring high cleanliness; filtration is needed when the gas contains heavy dust.
Quick Selection Table
| Criterion | Liquid Ring | Dry Screw |
|---|---|---|
| Moist gas, dust | Handles well | Requires filtration |
| Vacuum level | Moderate (~33 mbar) | Deep |
| Clean exhaust | Mixed with water | Clean, oil-free |
| Water consumption | Yes | No |
Choose by Application
Filtration, slurry suction, and wet processes → liquid ring; food/pharmaceutical/electronics applications requiring clean gas and deep vacuum → dry screw. For vacuum level and flow rate calculations, see the article how to select a vacuum pump.
Thái Khương Pumps is an authorized distributor of vacuum pumps imported from EU/G7.
Vacuum Pump Lines Available in Vietnam
For the liquid ring category — widely used in food, paper, and wet chemical applications — Thái Khương Pumps is the authorized distributor for Salvatore Robuschi (Italy):
Liquid ring for high-moisture gas — verify flow rate at the actual working vacuum level, not the nominal rating. View model specifications →
Liquid ring systems running on hard water should have scale and clearances inspected periodically — a gradual vacuum drop is usually caused by scale buildup, not pump wear. Spare parts by model: stock of over 5,000 spare part SKUs.
Frequently Asked Questions
In which industries are vacuum pumps used?
+
Food packaging, vacuum drying, plastics, paper, chemical, and medical industries. Each industry has different requirements for vacuum level and gas cleanliness.
What should be noted when maintaining a liquid ring vacuum pump?
+
Seal water quality and flow rate: hard water deposits scale that narrows clearances and reduces vacuum. Inspect impellers, port plates, and seals according to running hours; treat the water if hardness is high.
Are vacuum pump spare parts available in Vietnam?
+
Thái Khương Pumps maintains a stock of over 5,000 spare part codes (SKU) for distributed lines — send the model and condition (current achievable vacuum) for accurate spare parts advice.
Spare parts for vacuum pumps: see the in-stock catalog by model.
Submit your application specifications — Thái Khương Pumps engineers will advise on configuration and provide a quotation with CO-CQ within 24 hours. Request a quotation →
