Rotary Vane Pumps

Rotary Vane Pumps

Product and ordering information for Rotary Vane Pumps.  Quiet, rugged, and energy efficient vacuum pumps with a small footprint. Extremely low noise & vibration. Vacuum to 10-3 mbar. Free Air Capacity to 6 cfm.

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For applications requiring a greater vacuum depth than an oil-free diaphragm pump can provide, BrandTech® offers rotary vane pumps. VACUUBRAND® Rotary Vane Vacuum Pumps have been designed from the ground up for the best performance in laboratory applications. They are extremely low noise and low vibration, even compared to earlier VACUUBRAND® rotary vane models.

Product Features:

  • Rugged
    Exceptional tolerance to water vapor with minimal impact on ultimate vacuum.
  • Energy Efficient
    Low power consumption and low levels of waste heat generation compared to competitive models.
  • Compact
    Take up less space and weigh less than comparable models.
  • Reliability
    All VACUUBRAND® pumps and systems must pass rigorous product testing before leaving the factory. It's your assurance of a reliable pump.

Product No. & Specs

Ultimate Vacuum
Free Air Capacity
at 60Hz
Flange Inlet
Cat. No.
w/o gas ballast
w/ gas ballast
 RZ 2.5
 (dual voltage)
2 x 10-3
1 x 10-2
KF 16
10 mm
hose nozzle
 RZ 6
 (dual voltage)
2 x 10-3
1 x 10-2
KF 16
10 mm
hose nozzle
 RZ 9
2 x 10-3
1 x 10-2
KF 25
KF 25

*All pumps 120V, 60Hz unless noted. Dual voltage pumps sold with US power cords.

Vacuum Unit Conversion Calculator

Selection Chart

Rotary Vane Vacuum Pumps

Pump Model
 (Free Air Flow) 
RZ 2.5
(1.6 cfm)
  • Small freeze dryers
  • Small centrifugal concentrators 
  • For high-boiling point solvents
RZ 6
(4.0 cfm)
  • Freeze dryers up to six liters
  • Large benchtop centrifugal concentrators 
  • For high-boiling solvents
RZ 9
(6.0 cfm)
  • Freeze dryers up to ten liters
  • Large benchtop centrifugal concentrators
  • Schlenk lines
  • For high-boiling solvents

Unit Conversion Calculator

Not sure which vacuum pump is best for your application? This handy web application can recommend the best VACUUBRAND® vacuum pump or vacuum pump system for a wide range of applications, including rotary evaporation, centrifugal concentration, and more: Vacuum Pump Selection Guide


Which of your gauges should I choose for my vacuum pump?

The DCP3000 + VSP3000 or VACUU-VIEW extended are excellent choices for rotary vane pumps and roots pumps.

Can I retrofit a stand/catchpots/condensers/controllers to my pump?

Unfortunately, it is not possible to retrofit solvent recovery glassware to our pumps. However we do offer controllers that will work with your diaphragm or rotary vane vacuum pump, regardless of manufacturer.

Why do I need a separate solenoid valve and vacuum fitting for my CVC3000 controller?

Because the CVC3000 is designed to be operated with a huge span of vacuum pumps, we offer several different valves to go with it. Having a separate valve and vacuum fitting also allows the controller and valve to be located at their optimal positions for best vacuum control, and not just what is convenient for the controller. Additionally, while controllers that shut the pump off to control vacuum are less expensive, they can allow condensation inside the pump and produce additional strain on the pump upon restart.
If you would like to purchase a controller with the solenoid valve attached as a single unit, consider the CVC3000 detect.

My application uses different units than you show in the specifications? How do I know which pump I need?

Our Vacuum Pump Selection Guide contains a Unit Conversion Calculator that will convert these units.

Can you cross Pump X from Supplier Y to one of your diaphragm pumps?

It depends. For certain applications, like freeze drying, diaphragm pumps can not achieve the ultimate vacuum required to perform the task. In these cases, we can suggest our low-maintenance RC6 chemistry-Hybrid pump as an alternative. However, for most laboratory applications, selecting the best pump for an application requires a bit more information that just telling which rotary vane pump you used to use, so that you don't pay more than you need to, but get the correct accessories as well. Try our Vacuum Pump Selection Guide, or call our Customer Service department to get a customized recommendation for your application.

How do I select a cold trap coolant?

To select the proper coolant for your cold trap, you need to consider several things:

  • The temperature of the coolant
  • Your pump - in particular the vacuum level at which it operates,
  • The vapor pressure of your solvent at the temperature of your coolant.

For example, dry ice has a temperature of -78.5°C. Acetone has a vapor pressure at that temperature of approximately 0.5mbar. So, when operated with a two-stage rotary vane pump, with an ultimate vacuum of approximately 0.001mbar, a dry ice trap would not be effective. A better choice would be liquid nitrogen, with a temperature of -196°C.
Of course, a dual-stage rotary vane pump would be overkill to evaporate acetone. If a single-stage diaphragm pump, with an ultimate vacuum of 70mbar was used to evaporate acetone, a dry ice trap would be considerably more effective.
To know whether your cold trap is being effective or not, the efficiency can be calculated by weighing your sample before and after drying to determine the mass of the evaporated solvent. This can be compared to the mass of the liquid collected in the cold trap. All of the solvent that is not collected in the cold trap can be assumed to enter the pump. In the case of a rotary vane pump, it can be assumed to be contaminating the oil.

What do I need to order to fit a hose barb on my vacuum pump?

Order from this chart:

 Inner Diameter 
Small Flange
 w/ hose nozzle 
Cat. No.
Small Flange
 w/ hose nozzle 
Cat. No.
 RZ2.5, RZ6 
 RZ2.5, RZ6 

What can I do to prolong the life of my rotary vane pump for laboratory applications?

The number one enemy of a rotary vane pump in a laboratory is vapors from the application. These vapors can condense in the pump oil, and cause corrosion, or change the lubricating qualities of the pump oil. To best ensure the quality of your pump oil:

  • Warm up the pump before use.By warming up the pump, and the oil inside of it, condensation is reduced. A warm pump also performs it's best. A half hour of warm up time is optimal.
  • Use the gas ballast. The gas ballast helps purge solvent vapors from the pump during use.
  • Use an inlet cold trap. An inlet cold trap can reduce the amount of solvent vapors entering the pump.
  • Avoid particulates. Particles entering the pump can score the walls of the pump, reducing it's efficiency. Additionally, the particles created by scoring of the pump can also cause damage, setting off a chain of events to catastrophic failure.
  • Never block the pump outlet. Back pressure on the pump reduces its efficiency, and can cause serious internal damage. We do not recommend the mounting of any aftermarket accessories on a pump, except for original manufacturer equipment oil mist filters.
  • After use, run the pump with the inlet blocked and the gas ballast open. This helps purge any condensed vapors in the pump oil. A half hour is usually sufficient.
  • Check and maintain regularly. This includes, but is not limited to monitoring of oil level and color, and regular changes. Periodic measurement of pump performance can help prevent catastrophic failure.

Tech Info & Warnings

Manuals & Instructions

Manuals for Rotary Vane Pumps

⚠ WARNING – These products can expose you to chemicals including Lead and Lead Compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to

Accessories & Parts

BrandTech® Scientific offers parts and accessories for Vacuubrand® Rotary Vane Vacuum Pumps such as:

To order click here


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