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Dry Vacuum Pumps & Systems

Vacuum Solutions For Tough Industrial Environments

NASH dry vacuum pumps deliver dry, clean, flexible and safe vacuum solutions that are engineered for rigorous, non-stop demands of tough industrial environments; such as pharmaceutical and fine chemical. These systems are the most reliable and highly efficient dry screw vacuum pumps on the market.  

The NASH dry vacuum pump operates contact-free, requiring no lubrication in the pumping chamber. No lubrication means the dry vacuum pump operates without water, oil or any other liquid. This results in major advantages like no process contamination and no pollution caused by the pump operation. 

NASH dry vacuum pumps offer significant process and economic benefits with lower installation expenses, easier maintenance, low running costs, and reduced environmental impact while providing a more flexible vacuum.


 NASH Systems Are Safely Designed To Handle Tough Industrial Applications 

NASH dry screw vacuum pumps deliver a clean, oil-free vacuum for a variety of industrial applications. These dry vacuum systems perform with low rotational speed ensuring smooth and robust operation. Higher discharge pressure capabilities along with a high tolerance for vapor and dust and guarantee more process time with long service life. 

NASH dry screw vacuum pumps are designed to operate as oil-free, non-contacting systems. As a result, these dry screw vacuum pumps safely and reliably handle corrosives, organics, inorganics, and solvents.  Thus, making NASH dry vacuum pumps ideal for applications like degassing, vacuum metallurgy, vapor recovery, and central vacuum systems. These applications require a clean, oil-free vacuum and serve the following market segments: 

  • Chemical
  • Pharmaceutical 
  • Industrial
  • Petrochemical
  • Packaging 
  • R&D/Laboratories 

Furthermore, NASH dry screw vacuum pumps have a wide operating range, low life-cycle costs, and long maintenance intervals.  The wide operating range allows the dry pump to have limitless capacities with various backing pump options and high vacuum boosters. NASH dry pumps operate from well below 0.1 torr up to atmospheric pressure, ensuring fast pump downtimes. Low life-cycle costs and maintenance-free means high efficiency and a reduction in energy and utility costs.  

Nash provides a wide range of dry screw vacuum pumps packaged as bare pumps, pre-engineered or engineered-to-order systems. Engineered-to-order systems are custom designed to meet customer-specific specifications. Pre-engineered packages are available for quick shipment with plug & play installation.


How NASH Dry Vacuum Systems Operate

Nash Dry Vacuum System

  • A NASH dry screw vacuum pump consists of two parallel, screw-shaped rotor (1 and 2), one with a right-hand thread and the other with a left-hand thread.
  • Both screws turn in the compression housing (9) without friction and at very tight clearances. They are synchronized via a precision gear (3).
  • The compression housing and the special shape of the screws form compression chambers (4).
  • Due to the opposite rotation of the screws, the chamber connected with the suction port (5) is enlarged and the gas is transported into the compression chamber. Then, the chamber moves axially from the suction side to the pressure side (arrow).
  • In variable pitch models, the gas is compressed at each pitch change and cooled before the next pitch change, resulting in greater efficiency.
  • On the pressure side the chamber is moved against the axial housing wall and the volume is reduced until the front surface of the screw (1) opens the pressure channel (6) and the compressed gas is discharged through the pressure connection (7).
  • Cooling is achieved using a water-cooled outer chamber (8). Gas ballast port available for application-specific solutions (10)


NASH Dry Screw Vacuum Pumps Deliver Dry, Contact-free Operation. Learn More About How It Works In This Animation From Gardner Denver Nash. 


Quality Sustainable NASH Solutions

All NASH equipment is fully assembled and tested prior to installation. This assures top quality and avoids unforeseeable issues or operational downtime. NASH is a global leader of highly engineered industrial vacuum solutions. 

Backed by over 110 years’ experience, NASH CERTIFIED ™ experts provide aftermarket support with maintenance, service, parts, and repair. NASH service centers are globally located to keep your systems operating and to protect your vacuum investment by providing quality, reliable and efficient solutions.  

ISO Certified 

Nash manufacturing and service facilities are ISO 9001, ISO 14001 and OHSAS 18001 certified.