VARIO® diaphragm pump MD 4 NT VARIO

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VACUUBRAND20736300ca. 245 mmca. 235 mmca. 18.6 kg

These three-stage diaphragm pumps are an excellent solution for continuous, oil-free pumping of non-corrosive gases. They reach an excellent ultimate vacuum of 1 mbar. All parts in contact with pumped gases and vapors are made of aluminum, stainless steel and carefully selected plastics suitable for a wide range of applications with non-corrosive gases. The NT series provides whisper quiet and ultra-low vibration operation, high leak tightness and improved performance. The highly flexible fabric-reinforced double diaphragm made of FKM is ideal for extended operating life. The VARIO® design includes the VARIO® pump and the CVC 3000 vacuum controller with external gauge head. The demand-responsive motor speed control on VARIO® models further extends the already long lifetimes of diaphragms and valves.

Performance features

  • contamination-free pumping and evacuation
  • high flow rate even near ultimate vacuum
  • CVC 3000 controller on VARIO® version offers easy operation with clear text menus
  • VARIO® option for self-regulating vacuum optimization throughout the process
  • excellent ultimate vacuum, VARIO® version with higher pumping speed and TURBO·MODE for use as backing pump for turbo pumps


Technical data

Unit Converter
Technical dataUnit MD 4 NT VARIO
Vacuum controllerCVC 3000
Number of heads / stages4 / 3
Max. pumping speedm3/h5.7
Max. pumping speedcfm3.4
Ultimate vacuum (abs.)mbar/torr1 / 0.75
Ambient temperature range (operation)°C10 - 40
Ambient temperature range (storage)°C-10 - 60
Max. back pressure (abs.)bar1.1
Inlet connectionSmall flange KF DN 16
Outlet connectionSilencer / G1/4"
Rated motor powerkW0.53
Motor speed rangemin-130 - 2400
Degree of protectionIP 20
Dimensions (L x W x H)mm325 x 235 x 245
Noise level at 50 Hz, typ.dBA45
ATEX conformity (only 230V)II 3/- G IIC T3 X Internal Atm. only
Items suppliedPump completely mounted, ready for use, with manual.
AccessoriesStainless steel tubing KF DN 16 (1000 mm: 20673336)
Vent valve VB M-B (20674217)

MD 4 NT VARIO - Pumping speed graph

MD 4 NT VARIO - Pumping speed graph

MD 4 NT VARIO - Pump down graph (10 l volume)

MD 4 NT VARIO - Pump down graph
(10 l volume)

MD 4 NT VARIO - Dimension sheet

MD 4 NT VARIO - Dimension sheet

-Technical data are subject to change without notice-

Ordering data

Product nameMains voltage and frequencyPlug* Order no.
MD 4 NT VARIO 200-230 V~ 50-60 Hz
CEE 20736300
200-230 V~ 50-60 Hz
CH, CN 20736301
100-120 V~ 50-60 Hz
US 20736303

* As part of the implementation process of our new ERP system in 2018 our catalog numbers were extended to 8 digits in length by adding the digits “2” or “20” to the beginning of the old catalog numbers.

Product comparison


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-1 -5.7 5.7--✓-----✓✓

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-1.5 -16.0 16.0--✓-----✓✓

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