DVBS Roots–Screw Systems

Product Overview

configuration

• One,two or three-stage Roots vacuum pumps
• Vacuum pressure switches
• gas‑liquid separator
• common base frame
• heat exchanger

Design & Features

• Oil-free gas path delivers clean, uncontaminated vacuum

• Efficient solvent recovery with no process wastewater

• Optional corrosion-resistant coatings for aggressive media

• High vacuum, wide operating range and PLC automation

Typical Applications: Chemical Processing、Pharmaceuticals、Lithium‑battery Drying、Metallurgy & New Energy、Vacuum Drying & Concentration.

Description

Reviews

Product Introduction

Water-ring pumps are widely used in chemical and pharmaceutical processing. In standard service the working liquid is discharged directly; where the pumped medium contains organic solvents, toxic or hazardous components, a water-ring closed-loop circulation system is preferred.

Working Principle

The DVBL Roots–liquid-ring system uses Roots vacuum pumps as the main and intermediate stages with a liquid-ring pump as the backing stage — sometimes with an additional atmospheric ejector. Compared with a single liquid-ring pump it delivers higher pumping speed and deeper vacuum.

Key Advantages

Handles wet, mixed gas: Ideal for large volumes of wet or mixed gas streams at higher vacuum levels
Corrosion-resistant option: Suitable for corrosive media or mixtures compatible with the sealing liquid
Faster pumping: Sealing liquid condenses condensable vapours, boosting pumping speed
Cleaner discharge: Pair with a condenser to eliminate condensable vapour carry-over

Standard Composition

• Oil-free pump chambers — no contamination of the pumped system, clean vacuum.

• Easy solvent recovery.

• Anti-corrosion coating in Roots & screw chambers — handles water vapour, solvent vapour and many corrosive media.

• No waste oil or waste-water discharge.

• Low cooling-water requirement — ordinary recirculated water is sufficient.

Optional Accessories

• Pre-condenser & buffer tank, inlet vacuum filter

• Vacuum-control variable-frequency system

• Roots bypass line & valves, solvent cleaning tank

• Cooling-water temperature / pressure / flow monitoring

• Nitrogen purge flow / pressure monitoring

• Downstream condensation & recovery unit

Product FAQs

1. Why choose a Roots–screw vacuum system?

It provides high pumping speed, deep vacuum and oil-free operation. It is ideal for chemical, pharmaceutical, electronics and lithium-battery drying processes.

2. Can it handle corrosive gases and solvents?

Yes. Optional corrosion-resistant materials and coatings are available. Condensers, filters and cleaning systems can also be added for corrosive gases and solvent vapours.

3. Can the system recover solvents?

Yes. The oil-free gas path avoids pump-oil contamination, making solvent condensation and recovery easier. A pre-condenser or exhaust recovery unit can be installed when required.

4. How is the correct system selected?

Selection depends on the working vacuum, pumping capacity, gas composition, vapour load and operating temperature. We can configure the Roots stages, screw pump, motor power and PLC control system accordingly.

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