GE Roots DVJ Dry Exhauster s58f97 Specification Sheet
SPECIFICATIONS
ROOTS
™ RAM™-DVJ WHISPAIR™
Dry Vacuum Exhausters
Frames 406J, 412J & 616J
DESIGN AND CONSTRUCTION FEATURES
1. Single stage operation to 27” HgV
2. No valves, vanes or Teflon rings to wear
3. Alloy steel timing gears
4. Cylindrical roller bearings
5. Piston ring air seals
6. Lip-type oil seals (optional mechanical seal)
7. Splash oil lubrication
8. Horizontal and vertical configurations available
RAM™ stands for Reliability, Availability and
Maintainability. Today, more than ever, ROOTS is
committed to supplying our customers with reliable
products manufactured with state-of-the-art CNC
machine tools. Production and inventory are being
scheduled and controlled to ensure these units will be
available when you need them. Design improvements
such as repositionable rugged steel mounting feet and
die-cast aluminum drive end covers and gear covers
help to reduce installation costs and make normal
maintenance easier.
BASIC BLOWER DESCRIPTION
ROOTS™ RAM™-DVJ WHISPAIR™ dry exhausters
have an exclusive discharge jet plenum design which
allows cool, atmospheric air to flow into the cylinder.
This unique design permits continuous operation at
vacuum levels to blank-off with a single stage unit.
Standard dry vacuum exhausters are limited to
approx. 16” Hg vacuum because operation at higher
vacuum levels can cause extreme discharge tempera-
tures resulting in casing and impeller distortion and
possible failure. The RAM™ vacuum exhauster’s
integral cooling design eliminates the problems
caused by high discharge temperatures at vacuum
levels beyond 16” Hg.
The basic model is designed using integral-shaft
ductile iron impellers with an involute profile. the
casing and headplates are grey iron, while the drive
end cover and gear cover are aluminum. Carburized
and ground alloy steel spur timing gears are taper
mounted on the shafts, secured with a locknut.
Cylindrical roller bearings are splash lubricated at
both the gear end and the drive end.Piston rings
reduce air leakage through the head-plate bores
and lip-type oil seals prevent lubricants from
entering the air chamber. Units can be equipped
with mechanical seals for gas applications.
All units are designed with rugged steel mounting
feet which permit in-field adaptability to either vertical
or horizontal installation requirements.
ROOTS™ DVJ WHISPAIR™ exhausters can be
arranged to operate in two and three stage systems to
achieve vacuum levels down to 1 Torr.
OPERATING PRINCIPLE
Position 1: Incoming air is trapped between the impellers.Simultaneously,
pressurized air is being discharged. Position 2: As the upper impeller passes
the jet plenum, cooled, pressurized air flows into the space between the impeller
and cylinder. This cools the trapped air, helps control thermal growth and allows
higher discharge pressures. Position 3: The trapped air is then moved into the
discharge flange (left). Backflow is reduced, resulting in lower operating noise
level and reduced shock loading on the impellers.
POSITION 3
POSITION 2
POSITION 1
S-58F97 rev.0608
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