DeVilbiss SRi-628 HVLP Service Bulletin

D VILBISS SRi-628 HVLP and SRi-G210B TransTech
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 (100 psi)
1
Nominal Gun Air Inlet Pressure
(with Gun Triggered):
2 bar (29 psi) for 628 HVLP Air Cap
2 bar (29 psi) for 210 TransTech Air Cap
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
The SRi-628 HVLP gun was manufactured
to provide a maximum transfer efficiency
by limiting air cap pressure to 10 psi at
29 psi gun inlet pressure. (complies with
rules issued by SCAQMD and other air
quality authorities). An air cap test kit is
available (see Accessories) which can be
utilized to set the exact air cap presssure.
Air consumption for the 205 air cap is 4.5
SCFM at 10 psi cap pressure.
The SRi-G210B TransTech gun was manu-
factured to provide a transfer efficiency of
65% or greater at 29 psi gun inlet pressure.
Air consumption for the 210 air cap is 3.6
SCFM at 29 psi gun inlet 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 stain-
less steel fluid tip and needle.
This gun should not be used with
chlorinated solvent materials. See
page 2 for potential 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 materi-
als, 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. Other types will
not flow enough air for proper gun
operation.
If an air adjusting valve is used at
the gun inlet, use DeVilbiss Model
HAV-500 or HAV-501. Some competi-
tive adjusting valves have significant
pressure drop that can adversely
affect spray performance. Models
HAV-500 and HAV-501 have minimal
pressure drop, which is important for
HVLP spraying.
NOTE
NOTE
SERVICE BULLETIN
SB-2-525-C
Replaces SB-2-525-B
Repair Kit SRI-426
2. Attach the gravity feed cup to the mate-
rial 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 mate-
rial 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
adjustment 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.