Corrosion Resistant Diaphragm Vacuum Pump

Corrosion Resistant Diaphragm Vacuum Pump

Drawell corrosion-resistant diaphragm vacuum pumps are designed for reduced-pressure laboratory processes involving corrosive gases, solvent vapors and other chemically demanding media. The range includes fixed-capacity and variable-speed configurations with different pumping speeds, ultimate vacuum levels and gas-contact materials for applications from rotary evaporation and concentration to filtration, drying and distillation.

Applications of Corrosion Resistant Diaphragm Vacuum Pump

Rotary Evaporation 1

Rotary Evaporation

Vacuum support for solvent mixtures, extracts and concentrated solutions during rotary evaporation.

Vacuum Drying 2

Vacuum Drying

Vacuum source for powders, solid samples and laboratory materials during reduced-pressure drying.

Vacuum Concentration 1

Vacuum Concentration

Vacuum support for reaction solutions, extracts and purified fractions during sample concentration.

Vacuum Distillation 1

Vacuum Distillation

Supports reduced-pressure distillation of organic solvent mixtures and reaction solutions.

Solid Phase Extraction 1

Solid Phase Extraction

Vacuum source for SPE cartridges and liquid samples during compatible solid-phase extraction workflows.

Maximum Flow ≠ Actual Flow at Deep Vacuum

Maximum pumping speed describes performance near the high-pressure end. As vacuum becomes deeper, the actual pumping speed decreases, so model selection should be based on the required flow at the real working pressure—not only the maximum flow value.

Pumping Speed Changes with Vacuum Level1

How to Choose a Corrosion-Resistant Diaphragm Vacuum Pump? 

  • Gas/Vapor Type
  • Chemical Name
  • Concentration
  • Operating Temperature
  • 5–8 mbar → DWGM-20 / 30
  • 5 mbar → DWVP-30pro / DWGM-4C
  • 2 mbar → DWGM-45L

Do not rely solely on the maximum flow rate; especially for deep vacuum applications, consider the residual pumping speed at the actual operating pressure.

Fixed pumping speed is sufficient: DWGM-20 / 30

Flexible speed control required: DWGM-45L / DWVP-30pro / DWGM-4C

Especially for strong acids, strong alkalis, and organic solvent vapors: verify the materials of the gas path components.

DWGM-45L supports: 24-hour full-load operation.

Order Process

order process of Automatic melting point meter

Why Choose Us?

  • One-Station Shopping

“Multiple suppliers” have always been an issue in the procurement process. Drawell as a one-stop laboratory equipment and scientific instruments supplier, can perfectly solve this problem. In addition to manufacturing our own equipment, we also represent other laboratory equipment. Our product lines are rich and diverse at competitive prices. Provide one-stop service to customers.

  • Customer-centric Services

User Training – Training by Drawell skilled engineers about installation, debug tests, technical services, etc. It can happen in our factory in China, or at the site in the customers’ country. Cost depends on where and when the training happens.

  • Online Support

To discuss the problem and get it resolved, online chats, real-time video calls, and remote guidance. For the after-sales stage, our online technical guidance is free and ready forever.

  • 100% Quality Guarantee Policy

1 year free official warranty, including repairing quality-damaged parts, and offering replacements of selected parts (shipping cost is extra). 5% of the product price is charged for extending the warranty before the end of the official warranty.

FAQ

Start with the gas or vapor type, then confirm required vacuum and pumping speed.

No. Pumping speed normally decreases as inlet pressure falls. DWGM-4C, for example, decreases from 50 L/min at 1013 mbar to 5 L/min at 5 mbar.

Among the brochures currently provided, DWGM-45L is specified at 2 mbar.

DWGM-20 / 30 specify PTFE pump heads and composite diaphragms; DWGM-45L specifies a PTFE air chamber and air path.

DWGM-45L, DWVP-30pro and DWGM-4C have specified adjustable-speed ranges.

DWGM-20 / 30 explicitly list strong acid and base gases. For other models and specific chemicals, compatibility should be confirmed before use.

Yes. Rotary evaporation is explicitly listed for DWGM-20 / 30 and DWGM-45L.

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