DeVilbiss SRi-628 Service Bulletin

D VILBISS SRi-628 HIGH VOLUME LOW PRESSURE
E
IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
DESCRIPTION
The DeVilbiss SRi is a small gravity fed
spray gun designed for spraying spot
repairs and small areas. The gun can spray
from a small round to a 6" fan pattern
(according to setup). This product is
suitable for use with both water-based
and solvent-based coating materials.
SPECIFICATIONS
Air Supply
Connection: Universal 1/4" BSP
and NPS (M)
Maximum Static
Air Inlet Pressure: P = 7 bar (130 psi)
1
Nominal Gun Air
Inlet Pressure (with
Gun Triggered): 2 bar (29 psi)
Gun Weight (with
Cup and Lid): 390g (13.76 oz.)
MATERIALS OF CONSTRUCTION
FOR WETTED PARTS
Gun Body: Anodized Aluminum
Nozzle: Stainless Steel
Needle:
Stainless Steel
Cup: Nylon
Cup Lid: Polypropylene
This gun was manufactured to provide a
maximum transfer efficiency by limiting air
cap pressure to 10 psi (complies with rules
issued by SCAQMD and other air quality
authorities).
This gun will produce approximately 10
psi air cap pressure at 29 psi gun inlet
pressure. An air cap test kit is available
(see Accessories) which can be utilized to
set the exact air cap presssure.
consumption for the DeVilbiss SRi-628
is 4.5 SCFM at 10 psi cap pressure.
This gun comes with both a 4 oz. nylon
disposable gravity cup and lid.
GRAVITY FEED SPOT REPAIR SPRAY GUN
This gun includes 303 series
stainless steel fluid tip and
needle. This gun should not be
used with chlorinated solvent
materials. See page 2 for poten-
tial hazards.
Important: This gun may be used with most
common coating and finishing materials.
It is designed for use with mildly corrosive
and non-abrasive materials. If used with
other high corrosive or abrasive materials,
it must be expected that frequent and
thorough cleaning will be required and the
necessity for replacement of parts will be
increased.
INSTALLATION
For maximum transfer efficiency, do not
use more pressure than is necessary to
atomize the material being applied.
1. Connect the gun to a clean, moisture
and oil free air supply. Fully open air
flow valve (20). Install an air cap test kit
over tip. When gun is triggered on,
adjust regulated pressure to desired
setting to provide a maximum of 10 psi
at the air cap. Do not use more pres-
sure than is necessary to atomize the
material being applied. Excess pres-
sure will create additional overspray
and reduce transfer efficiency.
If quick connects are required,
use only high flow quick connects
approved for HVLP use such as
DeVilbiss HC-4419 and HC-4719.
Other types will not flow enough
air for proper gun operation.
Air
If an air adjusting valve is used at the
gun inlet, use DeVilbiss Model HAV-
500 or HAV-501. Some competitive
adjusting valves have significant
pressure drop that can adversely
affect spray performance. Models
HAV-500
minimal pressure drop, which is
important for HVLP spraying.
NOTE
NOTE
and HAV-501 have
SERVICE BULLETIN
SB-2-525
Repair Kit SRI-426
2. Attach the gravity feed cup to the
material inlet.
NOTE
Protective coating and rust
inhibitors have been used to keep
the gun in good condition prior to
shipment. Before using the gun,
flush it with solvents so that these
materials will be removed from
fluid passages.
OPERATION
Mix, prepare and strain the material to be
sprayed according to the paint maufacturer's
instructions.
Strain material through a 60 or 90 mesh
screen.
1. Fill the gravity feed cup with the mate-
rial. Do not overfill. Make sure that the
cup lid vent hole is clear.
2. Open the spreader adjustment valve
(6) (Fan) by turning the valve stem
counterclockwise.
3. Close the fluid needle adjusting screw
(12) by turning clockwise.
4. Turn on air supply and set gun inlet
pressure to lowest recommended pres-
sure for material being sprayed. Best
atomization will occur with 10 psig air
cap pressure. However, some materi-
als can be sprayed at lower pressures,
improving transfer efficiency.
5. Spray a test area by turning fluid needle
adjusting screw (12) counterclockwise
until a full coat is obtained.
If the finish is too sandy and dry, the
material flow may be too low for the
atomization air pressure being used.
If the finish sags, there is too much material
flowing for the atomization air pressure
being used.
Both of the above can be corrected by
increasing or decreasing the atomization air
pressure or the material flow. Pattern width
can be altered by turning spreader adjust-
ment valve (6), either clockwise to decrease
the width or counterclockwise to increase
the width.
See Spray Gun Guide, SB-2-001 latest revision,
for details concerning setup of spray guns.