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Two-Stage Rotary Vane Vacuum Pump

Two-Stage Rotary Vane Vacuum Pump

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The S4R Two-Stage Rotary Vane Vacuum Pump is a compact oil-sealed mechanical vacuum pump designed for reliable primary-vacuum generation in laboratory and materials-research systems.

Available with nominal pumping speeds from 4 to 24 m³/h at 50 Hz, the range covers compact benchtop vacuum systems through larger vacuum chambers, tube-furnace lines and laboratory process equipment. The two-stage rotary-vane architecture combines stable pumping performance with ultimate partial pressures down to 4 × 10⁻² Pa, depending on the selected configuration.

All configurations feature gas-ballast operation, IP44 protection and KF vacuum connections, with 220 / 380 V and single- or three-phase electrical configurations available according to the selected model. The range is particularly suited to battery research, materials processing, vacuum drying, degassing, controlled-atmosphere systems and general laboratory vacuum applications.

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Two-Stage Rotary Vane Vacuum Pump

4–24 m³/h Laboratory Vacuum Pump

Reliable Primary Vacuum for Laboratory and Materials-Research Systems

The S4R Two-Stage Rotary Vane Vacuum Pump is a compact oil-sealed mechanical pump designed for primary-vacuum generation in laboratory and materials-research systems.

Four configurations from 4 to 24 m³/h at 50 Hz cover compact laboratory installations through larger vacuum chambers, tube-furnace lines and laboratory process equipment.

Pumping speed
4 to 24 m³/h
Ultimate partial pressure
Down to 4 × 10⁻² Pa
Pumping principle
Two-stage rotary vane
Vacuum connections
KF16 · KF25 · KF40
Product Highlights

Compact primary vacuum from 4 to 24 m³/h

A scalable oil-sealed platform combining two-stage pumping, gas-ballast operation and standard KF vacuum interfaces.

01
Two-stage pumping
Two successive compression stages provide ultimate partial pressures of 4 to 5 × 10⁻² Pa according to the selected configuration.
02
Four pumping capacities
Nominal speeds of 4, 8, 16 and 24 m³/h at 50 Hz allow the pump to be matched to chamber volume and required evacuation performance.
03
Gas-ballast operation
Integrated gas ballast helps reduce condensation of compatible vapours in the vacuum oil during pumping.
04
Laboratory-ready interfaces
KF16, KF25 or KF40 connections are available according to the selected configuration for integration with standard vacuum components.
Pumping Principle

Two compression stages in series

Gas drawn from the vacuum system is compressed in a first rotary-vane stage and subsequently transferred to a second stage before discharge. Dividing the compression process between two stages enables a lower ultimate pressure than is typically achievable with a single-stage rotary-vane pump.

Both stages are oil-sealed. Vacuum oil contributes to sealing the internal clearances, lubricating the moving components and transferring heat generated during operation. Oil level and condition therefore have a direct influence on vacuum performance.

Ultimate pressure Ultimate-pressure values describe pump performance under defined conditions. The pressure obtained in a complete vacuum system also depends on chamber volume, seals, piping conductance, outgassing, process vapours and system leak rate.
Performance by Configuration

Pumping speed and ultimate pressure

Pumping speed varies with electrical supply frequency. Ultimate-pressure values are specified both without gas ballast and with gas ballast where applicable.

S4R Reference Pumping Speed 50 Hz Pumping Speed 60 Hz Ultimate Partial Pressure Ultimate Total Pressure Without Gas Ballast Ultimate Total Pressure With Gas Ballast
RVP-4 4.0 m³/h 1.1 L/s 4.8 m³/h 1.3 L/s 5 × 10⁻² Pa 5 × 10⁻¹ Pa 10 Pa
RVP-8 8.0 m³/h 2.2 L/s 9.6 m³/h 2.6 L/s 5 × 10⁻² Pa 5 × 10⁻¹ Pa 10 Pa
RVP-16 16.0 m³/h 4.4 L/s 19.2 m³/h 5.2 L/s 4 × 10⁻² Pa 4 × 10⁻¹ Pa 8 × 10⁻¹ Pa
RVP-24 24.0 m³/h 6.6 L/s 28.8 m³/h 7.9 L/s 4 × 10⁻² Pa 4 × 10⁻¹ Pa 8 × 10⁻¹ Pa
Gas ballast Gas ballast introduces a controlled quantity of gas during compression to help limit condensation of compatible vapours within the pump oil. Its use increases the attainable pressure and it is normally closed when the lowest achievable pressure is required.
Mechanical & Electrical Data

Interfaces, oil capacity and installation footprint

Physical dimensions, motor power, oil capacity and connection size vary according to the selected pumping-speed configuration.

S4R Reference Motor Power Vacuum Interface Oil Capacity Noise at 50 Hz Net Mass Dimensions L × W × H
RVP-4 0.40 / 0.37 kW KF16 or KF25 0.6 to 1.0 L ≤ 52 dB 19 kg 440 × 144 × 217 mm
RVP-8 0.40 / 0.37 kW KF16 or KF25 0.6 to 1.0 L ≤ 52 dB 21 kg 440 × 144 × 217 mm
RVP-16 0.75 / 0.55 kW KF25 0.9 to 1.5 L ≤ 58 dB 30 kg 530 × 188 × 272 mm
RVP-24 1.10 / 0.75 kW KF25 or KF40 1.3 to 2.0 L ≤ 58 dB 35 kg 567 × 188 × 272 mm
Compact configurations The RVP-4 and RVP-8 share the same listed external dimensions, motor-power values, oil-capacity range and vacuum-interface options, while providing different pumping speeds and net masses.
System conductance Effective pumping speed at the chamber is influenced by vacuum-line conductance. The connection should be kept as short and unrestricted as practical and should use a diameter appropriate to the selected pump. Long or narrow vacuum lines can significantly reduce the effective pumping speed available at the chamber.
Typical Applications

Primary vacuum across battery and materials research

For laboratory systems requiring a dependable mechanical vacuum source and standard KF integration.

Tube-furnace vacuum lines
Evacuation of compatible tube-furnace systems before controlled-gas or reduced-pressure thermal processing.
Vacuum drying ovens
Vacuum generation for compatible drying systems used with electrodes, powders, ceramics and laboratory materials.
Vacuum chambers
Primary evacuation of laboratory chambers for materials processing, testing and sample preparation.
Degassing
Removal of trapped gases from compatible liquids, resins, materials and laboratory process systems.
Controlled-atmosphere systems
Initial evacuation of compatible chambers and transfer locks before backfilling with a selected process or inert gas.
Backing vacuum
Foreline vacuum for compatible high-vacuum equipment where the required pumping speed and foreline-pressure conditions are satisfied.
Technical Specifications

Common platform specifications

Parameter Specification
Product type Oil-sealed two-stage rotary vane vacuum pump
Available configurations RVP-4, RVP-8, RVP-16 and RVP-24
Nominal pumping speeds 4, 8, 16 and 24 m³/h at 50 Hz
60 Hz pumping speeds 4.8, 9.6, 19.2 and 28.8 m³/h respectively
Gas ballast Integrated
Ultimate partial pressure 5 × 10⁻² Pa on RVP-4 and RVP-8; 4 × 10⁻² Pa on RVP-16 and RVP-24
Motor speed 1440 rpm at 50 Hz; 1720 rpm at 60 Hz
Voltage 220 V / 380 V
Electrical supply Single-phase / three-phase
Protection rating IP44
Operating ambient temperature 10 to 40 °C
Vacuum interface range KF16, KF25 or KF40 according to the selected configuration
Oil capacity range 0.6 to 2.0 L according to the selected configuration
Noise level at 50 Hz ≤ 52 dB on RVP-4 and RVP-8; ≤ 58 dB on RVP-16 and RVP-24
Net mass 19 to 35 kg according to the selected configuration
Installation Horizontal installation on a stable bench or floor surface
Operation & Maintenance

Oil level and oil condition influence vacuum performance

An oil-sealed rotary-vane pump relies on vacuum oil for internal sealing, lubrication and heat transfer. Oil level and condition should therefore be monitored regularly to maintain stable vacuum performance and service life.

1
Inspect Check the vacuum-oil level, pump condition and vacuum connections before operation.
2
Connect Assemble the vacuum line using correctly sized KF components, clean sealing surfaces and undamaged centering rings.
3
Start Start the pump and confirm normal operating behaviour before applying the required vacuum process.
4
Operate Use gas ballast where appropriate during compatible vapour-removal processes and close it when the lowest attainable pressure is required.
5
Maintain Inspect the oil periodically and replace it according to operating conditions, contamination level and the applicable maintenance schedule.
Process compatibility The standard pump is intended for compatible laboratory vacuum applications. Corrosive, reactive, strongly oxidising or hazardous process gases require a pump and vacuum system specifically selected for the chemical and safety requirements of the application.
Package Contents

Supplied in the selected configuration

Vacuum pump assembly
Two-stage rotary-vane vacuum pump and electric motor assembly in the selected pumping-speed configuration.
Initial vacuum-oil charge
Vacuum oil for initial commissioning, with quantity matched to the selected pump configuration.
Operating documentation
Installation, operation, vacuum-oil management and routine-maintenance guidance.
Available accessories Replacement vacuum oil and compatible exhaust-filtration accessories are available separately according to the selected pump configuration and application requirements.
Vacuum-line components Vacuum hoses, valves, clamps, centering rings, cold traps, gauges and other system-specific components are selected separately unless explicitly included in the ordered configuration.
Installation & Safety

Stable installation with unrestricted cooling airflow

Install the pump on a stable horizontal surface with sufficient clearance around the motor and pump body for cooling, inspection and maintenance. The electrical supply must correspond to the selected motor configuration.

Vacuum exhaust should be managed appropriately for the process. Where oil mist or process vapours may be generated, suitable exhaust filtration or laboratory extraction should be incorporated into the installation.

Pump selection Pump selection should consider chamber volume, required evacuation time, vacuum-line conductance, target operating pressure, vapour load and process compatibility rather than nominal pumping speed alone.

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