ROOTS UNIVERSAL RAI (URAI)
The Roots Blower URAI unit is available in 17 different models. All models feature the “universal” mounting feet which allow it to be mounted in four different configurations.
The unit is center-timed so that it may be operated in either direction. The unit features grease lubrication on the drive end and oil lubrication on the gear end.
Flow Range: 10 CFM to 2370 CFM
Pressure Range: 1 psi to 15 psi
Vacuum Range: 1″ to 16″Hgg (Dry)
The basic Roots Blower URAI model consists of a cast iron casing, carburized and ground alloy steel spur timing gears secured to steel shafts with a taper mounting and locknut, and cast iron involute impellers. Oversized antifriction bearings are used, with a cylindrical roller bearing at the drive shaft to withstand V-belt pull.
DESIGN AND CONSTRUCTION FEATURES
• Detachable steel mounting feet
• Rigid one-piece cast iron casing
• Anti-friction bearings
• Thrust Control
• Splash oil lubricated spur timing gears
• Connections in standard pipe sizes
• Straight, precision machined two-lobe impellers
• Ground steel shafts
Warranty: Twenty-four months of operation or thirty months from date of original purchase.
A conventional positive displacement moves a gas from the inlet to the discharge of the cylinder as illustated below:
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