Proven technology, proven designs –
quality products you can trust.

COBRA NC 2500 B

  • Advanced Screw Design
  • Efficient:
    low energy consumption, minimal maintenance, minimized operating costs
  • Robust:
    high vapor and particle tolerance, self-draining
  • High Performance:
    high pumping speed at all inlet pressures
  • Flexible:
    various sealing configurations, ATEX-certified version available


The COBRA NC is a series of high performance and robust dry screw vacuum pumps for demanding applications with maximum flexibility and modularity for process changes. These vacuum generators are in use wherever gases and vapors need to be pumped reliably. The COBRA NC 2500 B has been specially designed for applications in the rough vacuum range, and is perfectly suited for steel degassing, space simulation or vacuum drying.

The proven, completely dry screw vacuum technology allows the COBRA NC to run without operating fluids in the compression chamber. In practice this means no contamination of the pumped medium, and no environmental emissions. In addition, no costs arise for the purchase, replacement and disposal of operating fluids. Maintenance tasks such as oil changes or filter replacement are no longer required or are reduced to a minimum.

Vacuum pumps of the COBRA NC series are robust, extremely reliable and highly efficient – and the most advanced screw vacuum pumps on the market today. They operate efficiently throughout their vacuum range, and deliver constantly high pumping speeds.

COBRA NC dry screw vacuum pumps feature dry compression, a specially developed screw profile, and unimpeded gas discharge. The result is a high degree of vapor and particle tolerance. Their design ensures an even heat distribution over the whole pump stage, reducing thermal stress and increasing service life.

The screws are manufactured from a single-piece casting avoiding any gaps, making the ingress of process fluids or particles impossible, and thereby preventing corrosion.


COBRA NC 2500 B – the dry and robust solution for rough vacuum processes with high gas flows.

Would you like to know more?
Contact us directly (Busch United States):
+1 757 463 7800 Get in contact

Technical specifications
Two screw rotors inside the cylinder of the COBRA NC rotate in opposite directions. The pumped medium is trapped between the cylinder and screw chambers, compressed, and transported to the gas outlet. During the compression process the screw rotors do not come in contact with each other or the cylinder. Thus, no lubricants or operating fluids are required in the compression chamber. COBRA NC series vacuum pumps use efficient water cooling resulting in an even temperature distribution throughout the pump body, and ensuring thermal stability throughout the process.

Accessories / Technical options

  • Seal gas system
  • Dilution gas system
  • Adapter for ASME flanges
  • Exhaust silencer

COBRA NC 2500 B
COBRA NC 2500 B
Pumping speed

Air at 70 ºF. Tolerance: ± 10%

60 Hz
Pumping speed
Technical data COBRA NC 2500 B
Max. pumping speed ACFM 60 Hz 1471
Ultimate pressure Torr 60 Hz 0.75
Nominal motor rating HP 60 Hz 100
Nominal motor speed RPM 60 Hz 3600
Sound level (ISO 2151) dB(A) 60 Hz 84
Approximate weight Lbs. 4400
Dimensions (L x W x H) inches 94 7/16 x 64 ½ x 57 ⅜
Gas inlet / outlet ANSI/NPT 6" / 4"

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COBRA NC 2500 B

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