GE s5582b Specification Sheet

POSITION 3

POSITION 2POSITION 1

SPECIFICATIONS

ROOTS™DVJ WHISPAIR

™

Dry Vacuum Exhausters

Frame 721J

BASIC DRY VACUUM PUMP DESCRIPTION

ROOTS™ 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 exhausters are limited to approx.
16” Hg vacuum because operation at higher vacuum
levels can cause extreme discharge temperatures
resulting in casing & impeller distortion and possible
seizure. The DVJ vacuum exhauster’s integral cooling
design eliminates the problems associated with high
temperatures at vacuum levels beyond 16” Hg.

DVJ WHISPAIR™ exhausters are heavy-duty units
with integral-shaft ductile iron impellers. The casing,
headplates, gear cover and drive end cover are grey
iron. 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 drive end. Piston rings reduce
air leakage through the headplate bores and lip-type oil
seals prevent lubricants from entering the air chamber.
Rugged steel mounting feet permit infield 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.

DESIGN AND CONSTRUCTION FEATURES

1. Rigid cast iron cylinder and headplates

2. Anti-friction cylindrical roller bearings

3. Splash lubricated spur timing gears

4. Inlet and discharge connections in standard
pipe sizes

5. Involute profile ductile iron impellers

OPERATING PRINCIPLE

WARRANTY PERIOD

Twelve (12) months from date of original unit
start-up or 18 months from date of original
shipment, whichever occurs first.

S-5582.B rev.0708

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.

PERFORMANCE TABLE

Frame Speed Maximum 16” HGV 20” HGV 24” HGV 27” HGV

Size RPM Free Air CFM CFM BHP CFM BHP CFM BHP CFM BHP

1180 975 57.2 755 71.2 333 85.2 * 95.7

721J 1770 1806 87 1585 107.7 1163 128.3 122 143.8

200 2411 109.6 2190 134.8 1768 160.1 727 179.1

2
2600 3658 2973 131.4 2753 160.7 2331 190 1290 212

Notes: * Denotes blank-off.

Ratings based on inlet and jet air at standard temperature of 68°F, discharge and jet pressure of
30” HGV and specific gravity of 1.0. Refer to factory for performance guarantee above 24” HGV.

OUTLINE DRAWING &
DIMENSIONAL TABLE

VERTICAL CONFIGURATION
(Horizontal Air Flow)

HORIZONTAL CONFIGURATION
(Vertical Air Flow)

Drive Shaft

Frame A A’ BC OO’ P P’ RUKeyway AA AA’ AB AF AF’ AW AX Net Wt.

Size D D1 (lbs)

721J 19.00 26.00 27.00 39.38 17.00 10.00 24.88 25.25 24.25 22.75 13.50 2.375 .625 x .313 9.00 15.25 5.50 12 FLG 12 FLG 12 FLG 3.50 1750

NOTES: 1. All dimensions are in inches. 2. Weights are in pounds, and are approximate. 3. Do not use for construction.

Dresser Roots

Houston, Texas Headquarters • U.S. Toll Free Phone: [phone]-ROOT(S) (7668) • Direct Phone: [phone]
Connersville, Indiana Operations • U.S. Toll Free Phone: [phone] • Direct Phone: [phone]
United Kingdom Operations • Phone: [phone]
USA/Canada Sales • Phone: [phone]
Houston, Texas Factory Service • Phone: [phone]
Mexico City Sales and Factory Service • Phone: [phone]
Dubai Sales and Factory Service • Phone: [phone]
Malaysia Sales • Phone: [phone]
China Sales • Phone: [phone]
Shanghai Factory Service • Phone: [phone]

©2007 Dresser, Inc. all rights reserved. • Printed in the U.S.A. • All information subject to change
without notice. • Universal RAI and EasyAir are registered trademarks of Dresser, Inc. • ROOTS,
RAM X, and WHISPAIR, are trademarks of Dresser, Inc.

S-5582.B rev.0708

Location

www.dresser.com/rootsblowers

Approx