Double Stage Liquid Ring Vacuum Pump
Achieve significantly deeper vacuum levels with our two-impeller design — engineered for demanding industrial processes where single-stage pumps reach their limit.
Deeper Vacuum
Two-stage compression delivers up to 33 mbar absolute pressure for critical applications.
High Efficiency
Optimized impeller geometry reduces power consumption while maintaining peak performance.
Rugged Build
Cast iron construction with SS rotor shaft handles corrosive gases and harsh environments.
Low Maintenance
Isothermal compression with service liquid minimizes wear and extends service intervals significantly.
Product Overview
When a single-stage pump waves the white flag, our double-stage design rolls up its sleeves and gets to work. Built for processes that demand deep vacuum without flinching at wet gas or condensable vapors, this pump compresses in two sequential stages — drastically reducing the pressure differential across each impeller.
The result is a machine that pulls significantly lower absolute pressures while maintaining the liquid ring's signature tolerance for slugs, droplets, and the kind of harsh gas mixtures that make dry pumps expensive to maintain. No fragile lobes, no tight clearances — just stubborn, reliable vacuum generation that thrives where others choke.
From chemical process evacuation to condenser air extraction, this is the pump you spec when the process gas is unfriendly and the vacuum target is unforgiving.
Explore SpecificationsTwo-Stage Compression
Gas is compressed across two impellers in series, slashing the pressure ratio per stage and unlocking vacuum levels single-stage pumps simply cannot reach.
Higher Efficiency
Lower inter-stage pressure drop means less power consumed per cubic meter of gas evacuated — translating directly to lower operating costs over the pump's lifetime.
Handles Wet Gases
Condensable vapors, liquid slugs, and saturated gas streams are handled without damage — the liquid ring acts as both sealant and shock absorber.
Rugged Construction
Heavy-duty cast iron casings, stainless steel shafts, and oversized bearings ensure decades of reliable service in the harshest industrial environments.
Working Principle
Three steps from ordinary water to a vacuum deep enough to make physics uncomfortable. No magic — just eccentric geometry, centrifugal force, and a liquid ring that refuses to quit.
Eccentric Impeller Rotation
The impeller sits off-center inside the cylindrical casing like a deliberate engineering provocation. As it spins, centrifugal force hurls the seal liquid outward against the casing wall — but because the impeller is eccentric, the water isn't just spinning. It's surging and retreating in a controlled, rhythmic pulse that creates expanding and collapsing pockets between the blades. That's where the real work begins.
Liquid Ring Formation
The seal liquid forms a perfect ring against the casing — a spinning, unbroken curtain of water that acts as both piston and seal simultaneously. As the impeller rotates, the liquid ring alternately recedes from and plunges toward the hub, creating crescent-shaped gas chambers that expand to draw process gas in through the inlet port, then compress it as the ring closes back in. No metal-on-metal contact, no lubrication headaches, just a liquid piston doing what pistons do — only at 1,450 RPM with zero complaints.
Two-Stage Compression for Deeper Vacuum
Here's where single-stage pumps tap out and our double-stage design takes the crown. After the first impeller compresses the gas, instead of discharging it, we route it straight into a second impeller on the same shaft — already spinning, already hungry. That second stage starts its compression cycle from a lower inlet pressure, pushing the overall vacuum deeper than any single-stage geometry can manage. The pressure differential per stage drops, mechanical stress evens out, and the pump pulls absolute pressures that make process engineers grin and dry pumps nervous.
The liquid ring doesn't care if your process gas is wet, dirty, or carrying condensable vapors. It just keeps spinning, compressing, and daring the vacuum to go deeper.
Key Features
Six reasons this pump doesn't just meet industrial standards — it rewrites them. Every feature is a deliberate answer to the question: what would make this thing unbreakable?
Deep Vacuum Levels
Achieves vacuum down to 33 mbar absolute — deep enough to pull moisture from saturated process streams. The eccentric rotor geometry compresses the liquid ring progressively, squeezing every last bit of capacity from the sealing water before discharge.
Continuous-Duty Performance
Built for 24/7 operation without thermal runaway or seal fatigue. The liquid ring acts as both coolant and lubricant, absorbing compression heat while protecting the impeller from dry-running damage that would sideline a dry vacuum pump within hours.
Low-Noise Operation
Operating below 72 dB(A) at full load, this pump keeps plant floors conversation-friendly. The water cushion dampens impeller vibration and eliminates the metallic clatter of dry-vane pumps, while the double-stage design smooths pressure pulsations at the discharge port.
Corrosion-Resistant Options
Available in SS304, SS316, and duplex stainless steel for aggressive chemical environments. The liquid ring continuously washes internal surfaces, preventing corrosive gas accumulation on impeller blades — a failure mode that eats conventional dry pumps in acidic or solvent-laden service.
Mechanical Seal Flexibility
Compatible with single, double, and cartridge mechanical seals from John Crane, EagleBurgmann, and AESSEAL. The modular stuffing box accepts gland packing for budget-conscious installations or tandem seals with barrier fluid for zero-leakage applications involving hazardous process gases.
Energy Efficiency
IE3 premium-efficiency motors paired with optimized impeller profiles cut power consumption by up to 18% versus conventional liquid ring designs. The double-stage compression reduces the pressure differential per stage, lowering the brake horsepower required to reach deep vacuum setpoints.
Technical Specifications
Every parameter measured, tested, and certified. This is the blueprint that separates industrial-grade vacuum from wishful thinking.
Benefits
Engineered from the ground up to deliver uncompromising performance in the harshest industrial environments. Here's what that means for your operation.
Industrial Reliability
- Heavy-duty cast iron construction withstands continuous 24/7 duty cycles without fatigue or deformation, keeping your process line running year after year.
- Proprietary shaft sealing technology eliminates leakage even under fluctuating vacuum loads, reducing unplanned downtime by up to 40%.
- Every pump undergoes a 72-hour endurance test before shipment, so you receive a unit that is production-ready from day one.
Operational Efficiency
- Optimised impeller geometry reduces power consumption by 15-20% compared to conventional liquid ring designs, directly lowering your energy bills.
- Service-liquid recirculation system minimises water usage by up to 30%, cutting operational costs and meeting environmental compliance targets.
- Tool-less access panels enable routine inspection in under 15 minutes, slashing maintenance labour hours and keeping your team focused on production.
Application Versatility
- Handles saturated gases, condensable vapours, and liquid slugs without damage — ideal for chemical, pharmaceutical, and food processing industries.
- Available in multiple material grades including SS304, SS316, and duplex stainless steel for corrosive or high-purity applications.
- Compact footprint fits existing plant layouts with minimal piping modification, making retrofits fast and cost-effective.
Applications & Use Cases
From corrosive chemical processing to high-purity pharmaceutical environments, our double stage liquid ring vacuum pumps deliver consistent, reliable vacuum across the most demanding industrial sectors.
Chemical
Handles corrosive vapors and solvent recovery with ease using compatible materials of construction. The liquid ring design provides inherent safety when pumping flammable or explosive gas mixtures.
Pharmaceutical
Supports critical drying, distillation, and crystallization processes under clean vacuum conditions. Stainless steel internals ensure product purity and compliance with stringent GMP requirements.
Power Plants
Essential for condenser air evacuation and turbine gland sealing in thermal and nuclear power stations. Rugged construction handles high condensate loads without performance degradation.
Sugar
Provides reliable vacuum for pan boiling, evaporation, and crystallization stages in sugar refining. The liquid ring pump tolerates sugar carryover and moisture without mechanical damage or efficiency loss.
Paper
Drives dewatering on paper machine wire and press sections, improving sheet formation and drying efficiency. Handles high volumes of water-saturated air with minimal maintenance intervention.
Need Deeper Vacuum?
Every industrial vacuum challenge has a solution. Share your requirements and our engineering team will design a custom liquid ring vacuum system tailored to your process parameters.
Call Us Directly
+91 70165 44755
Mon–Sat, 9:00 AM – 6:00 PM IST
Visit Our Facility
49, Gurukrupa Estate, Near Balaji Estate Gujarat, India
