Our dry vacuum pumps & systems 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 chemicals. Our dry vacuum pumps & systems are one of the most reliable and highly efficient solutions on the market. Learn more by clicking the product cards below.

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

Contact-Free Operation

Our dry vacuum pumps operate contact-free; thus, requiring no lubrication in the pumping chamber, which means our 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 & systems 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. 

Designed To Handle Tough Industrial Applications 

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

Our dry vacuum pumps & systems safely and reliably handle corrosives, organics, inorganics, and solvents.  Thus, making NASH dry vacuum pumps & systems 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

Furthermore, our dry vacuum pumps & systems have a wide operating range, low life-cycle costs, and long maintenance intervals. The wide operating range allows the pump to have limitless capacities with various backing pump options including high vacuum boosters. NASH dry vacuum pumps operate from well below 0.1 torr up to atmospheric pressure. Low life-cycle costs and maintenance-free results in high efficiency and a reduction in energy and utility costs, as well as minimized operational downtime.

Dry Screw Vacuum Pump Principle Of Operation

Nash Dry Vacuum System

  • Dry screw vacuum pump consists of two parallel, screw-shaped rotors (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)


Watch Our Animation To Learn How Dry Vacuum Pumps Deliver Contact-Free Operation

Quality Sustainable Solutions

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

Backed by over 110 years of experience, NASH CERTIFIED™ experts provide aftermarket support with maintenance, service, parts, and repair. Our 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 

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

Downloads For Dry Vacuum Pumps & Systems