GENERAL
Identification
For model identification, see the nameplate
mounted on the side of the exhaust box.
This manual is written to cover RA and RC ver-
sions of models 0025, 0040, 0063, 0100, and 0250
with a "C" or "E" appearing as the seventh character
in the model type number stamped into the name-
plate. For example it would appear as follows:
RAXXXX - CXXX - XXXX
When ordering parts, it is helpful to include the
identification code stamped into the side of the
cylinder as well as the serial number from the name-
plate.
Operating Principles
All reference (Ref. XX) numbers listed in the
text and on illustrations throughout this manual are
related to the drawings and parts list near the center
of this publication.
All R5 Series, Single Stage, Rotary Vacuum
Pumps are direct-driven, air-cooled, oil-sealed
rotary vane pumps which operate as positive dis-
placement pumps. As Figure 1 shows, they consist
of a rotor mounted concentrically on the drive shaft
and positioned eccentrically in a cylindrical stator.
The rotor has three radially sliding vanes which
divide the pump chamber into three segments. The
gas to be pumped enters at the inlet port (Ref. 260),
passes through the inlet screen (Ref. 261) and the
open anti-suck-back valve (Ref. 251) into the pump
chamber. As the rotor rotates, the inlet aperture is
closed, the gas is compressed and forced out through
one-way valves between the pump cylinder and the
exhaust box. This operation is repeated three times
each revolution.
1.0 INSTALLATION
1.1 Unpacking
Inspect the box and pump carefully for any signs
of damage incurred in transit. Since all pumps are
ordinarily shipped FOB our factory, such damage is
the normal responsibility of the carrier and should be
reported to them.
Remove the nuts from the bottom of the
box/crate and pull the pump out of the container,
then unscrew the studs from the bottom of the rub-
ber feet.
2
All R5 series pumps are designed to handle air.
Vapor in the air stream can be tolerated when the
pump is operated within certain operating parame-
ters as defined by Busch, Inc. Engineering (see
Section 2.2 Gas Ballast). When you desire to use
the pump on an air stream that contains vapors, con-
tact Busch, Inc. Engineering for operating recom-
mendations; otherwise, the warranty could be void.
Figure 1 Module Cross Section
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Страница 120: ...RA 0165 0205 0255 0 0305 D Ref BMC Dwg T111 911 728 D 15 Fig 5 Exploded View Drawing of Pump ...