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Dry Screw Vacuum Pumps

Oil-free dry screw vacuum pumps for clean, reliable vacuum generation across demanding industrial processes, offering efficient operation, low maintenance and dependable vacuum performance.
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Introduction

Atcorp offers dry screw vacuum pump solutions for applications where clean, oil-free vacuum and reliable process performance are essential. The dry screw design eliminates sealing-fluid contamination while supporting efficient vacuum generation, low operating costs and reliable handling of demanding process vapours. (everestblowers.com

Key Benefits

100% Oil-Free Pumping
Low Power Consumption
Low Noise & Vibration
Efficient Vacuum Generation
Faster Pump-Down
Process Purity

Why Choose Dry Screw Vacuum Pumps?

Conventional wet vacuum technologies can introduce oil, water or other sealing fluids into the process and may involve higher utility and maintenance requirements. Dry screw vacuum pumps provide an oil-free alternative, allowing process vapours to pass through the pumping system without contamination from sealing fluids.
Specification Dry Screw Vacuum Pump
Pumping Technology Dry Screw
Operation 100% Oil-Free
Screw Design Hybrid Combined Variable Pitch
Lubrication at Vacuum Stage No Process Sealing Fluid
Vacuum Performance High Ultimate Vacuum
Pump-Down Fast
Cooling Application-Dependent
Noise & Vibration Low
Construction Special Alloy Options
Surface Protection Special Plating Options
Drive Options Fixed Speed / VFD
Control Options PLC / Electrical Control Panel

A dry screw vacuum pump creates vacuum by transporting and compressing process gas through two precisely engineered, non-contacting screw rotors.

 

Step 1 – Gas Entry
Process gas or vapour enters the pump through the suction inlet.

 

Step 2 – Screw Rotation
Two parallel screw rotors rotate in opposite directions at high speed.

 

Step 3 – Gas Trapping
The screw geometry forms pockets that capture and transport the incoming gas.

 

Step 4 – Compression
The gas is progressively compressed as it moves along the screw chambers.

 

Step 5 – Discharge
Compressed gas exits through the discharge side of the pump.

 

Step 6 – Continuous Vacuum
Continuous gas transport maintains the required vacuum for the connected process.

 

Because the rotors operate without contact at the pumping stage, the process gas is not exposed to oil or water used as a sealing fluid.

100% Dry Operation

No oil, water or steam is used as a sealing fluid in the vacuum pumping stage, helping prevent process contamination.

Stable Vacuum Performance

Hybrid variable-pitch screw geometry supports efficient gas transport and consistent vacuum generation.

Lower Energy Consumption

Efficient screw design can reduce power consumption compared with conventional vacuum technologies.

Faster Process Cycles

High pumping efficiency can support faster pump-down and shorter batch cycle times.

Harsh-Process Capability

Special alloy construction and surface treatments can be selected for demanding and corrosive process conditions.

High Vapour Handling

The screw configuration is suitable for applications involving significant process vapour loads.

Reduced Utility Requirements

Dry operation eliminates the need for sealing water or steam and reduces associated utility handling.

Process Recovery

Because the process is not contaminated by sealing fluid, valuable vapours and solvents can potentially be recovered downstream.

Dry screw vacuum pump packages can be configured with accessories according to process requirements.

  • Inlet port module with vacuum gauge point
  • Electropneumatic isolation valve
  • Non-return valve
  • Nitrogen inlet purge / gas ballast module
  • Nitrogen seal purge module
  • Solvent flushing module
  • Vacuum transmitter
  • Inlet filter housing
  • Condenser with receiver
  • Cooling water line module
  • Variable Frequency Drive
  • PLC logic controller
  • Electrical control panel
  • Stainless steel isolation valve
  • Discharge silencer
  • Special seal and coating options


Final configuration should be selected according to the process gas, vapour load, vacuum level, temperature and chemical compatibility requirements.

Industrial Applications

Dry screw vacuum pumps are suited to industrial processes where clean vacuum, vapour handling, process recovery and reliable operation are important.
Pharmaceutical Manufacturing
Supports clean vacuum processes while minimizing contamination and solvent-loss concerns.
Chemical Processing
Handles demanding vacuum applications involving process gases, solvents and corrosive vapours.
Vacuum Distillation
Provides efficient vacuum generation for distillation and evaporation processes.
Solvent Recovery
Supports recovery of valuable process vapours without contamination from sealing fluids.
Food & Edible Oil Processing
Provides oil-free vacuum for suitable drying, evaporation and processing applications.

Frequently Asked Questions

Find answers about dry screw vacuum pumps, including oil-free operation, vacuum performance, maintenance, process vapour handling and industrial applications.
A dry screw vacuum pump uses two non-contacting screw rotors to transport and compress process gas without using oil or another sealing fluid in the vacuum pumping stage.
Oil-free operation prevents sealing-fluid contamination of the process and eliminates the need to manage oil or water as a vacuum-stage sealing medium. This can also reduce utility and maintenance requirements.
Yes. Dry screw technology is particularly useful in processes involving gases and vapours. Proper system design, temperature control, condensers and purge arrangements may be required depending on the process.
They can be configured for demanding applications using suitable alloy materials and special coatings or plating. The final material selection should be based on the specific process gas and chemical exposure.
The vacuum pumping stage operates without oil or water as a sealing fluid. Specific drive, bearing or auxiliary components may have their own lubrication requirements depending on the selected configuration.
They can. Efficient pumping and faster pump-down can contribute to shorter process cycles. Published application information indicates significant batch-time reductions compared with wet vacuum technologies in suitable processes.
Yes. Depending on the application, a dry screw pump can be configured with accessories such as condensers, filters, purge systems, valves, controls and other components to create an application-specific vacuum package.
Yes. Atcorp can help Indian industrial customers evaluate vacuum level, pumping capacity, process vapours, chemical compatibility and operating conditions to identify and supply a suitable dry screw vacuum solution.

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