Designed for Reliable Operation in Harsh Conditions
The AT line of vacuum pumps represents NASH’s first generation of two stage vacuum pump technology engineered specifically for condenser exhaust applications. Featuring an integral two‑stage rotor design, the AT two stage vacuum pump reliably achieves vacuum levels as low as 0.8 inHgA (28 mbar absolute), approximately 40% lower absolute pressure than a comparable single‑stage vacuum pump.
AT liquid ring two stage vacuum pumps were developed to meet the demanding requirements of the chemical, petrochemical, and power generation industries. The integrated two‑stage rotor allows the pump to effectively condense process vapors and support their recovery or safe disposal, even under difficult operating conditions.
Conical Porting and Rotor Configuration
Patented in 1932, NASH’s variable conical porting design remains a core performance advantage of the AT two stage vacuum pump. This unique porting geometry balances compression forces against the weight of the rotor and shaft, helping to reduce bearing loads during operation. Variable conical porting also optimizes performance across the pump’s full operating range.
Continual innovation has built upon this proven design, with key features including:
- Optional lobe purge to reduce erosion damage in applications with solids
- Large differential pressure capability
- Gas scavenging feature that minimizes back‑slip from discharge to inlet, improving capacity, particularly at deep vacuum
- High tolerance for liquid carryover
- Side discharge configuration to reduce the risk of flooded starts
- Self‑priming design that may eliminate the need for a booster pump in recirculated systems
Proven Performance, Reliability, and Efficiency
The AT two stage vacuum pump delivers dependable performance and long‑term reliability based on the proven NASH conical liquid ring pump design.
The first AT3006 two stage vacuum pump was manufactured and tested at a NASH facility, where results demonstrated up to a 25% increase in dry air capacity in the high‑vacuum range, without any increase in power consumption. Compared to the AT3004, the AT3006 provides improved operating efficiency, an increasingly important factor given today’s rising energy cost.Whether you operate an existing AT two stage vacuum pump that requires service, repair, or full replacement with a new or remanufactured duplicate unit, NASH has the expertise, parts, and support to meet your operational needs.
