DeVilbiss SRI-2-12-K User manual

IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
DESCRIPTION
The 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 9" 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: P1 = 7 bar (100 psi)
Nominal Gun Air
Inlet Pressure (with
Gun Triggered): 2 bar (29 psi)
Gun Weight (with
4 oz. Cup and Lid): 390g (13.76 oz.)
MATERIALS OF CONSTRUCTION
FOR WETTED PARTS
Gun Body: Anodized Aluminum
Nozzle: 303 Stainless Steel
Needle: 303 Stainless Steel
Cups: Nylon and Aluminum
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.
Air consumption for the SRI is 5.0 SCFM
at 10 psi cap pressure.
This gun comes with either an 8 oz. or 4 oz.
aluminum gravity cup with a polypropylene
lid plus a 4 oz. nylon disposable cup with
a polypropylene lid.
SERVICE BULLETIN
SB-2-511-A
Replaces SB-2-511
Repair Kit SRI-426
SRi HIGH VOLUME LOW PRESSURE
GRAVITY FEED SPOT REPAIR SPRAY GUN
NOTE
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 thor-
ough cleaning will be required and the ne-
cessity for replacement of parts will be in-
creased.
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.
NOTE
If quick connects are required, use
only high flow quick connects ap-
proved for HVLP use such as DeVil-
biss HC-4419 and HC-4719. Other
types will not flow enough air for
proper gun operation.
NOTE
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 and HAV-501 have
minimal pressure drop, which is
important for HVLP spraying.
2. Attach the gravity feed cup to the ma-
terial inlet.
NOTE
Protective coating and rust inhibi-
tors have been used to keep the
gun in good condition prior to ship-
ment. Before using the gun, flush
it with solvents so that these ma-
terials 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.

Page 2 SB-2-511-A
Important information that tells how to
prevent damage to equipment, or how
to avoid a situation that may cause mi-
nor injury.
NOTE
Information that you should pay special
attention to.
SAFETY PRECAUTIONS
This manual contains information that is important for you to know and understand. This information relates to USER SAFETY and
PREVENTING EQUIPMENT PROBLEMS. To help you recognize this information, we use the following symbols. Please pay particular
attention to these sections.
Important safety information - A hazard
that may cause serious injury or loss of
life.
The following hazards may occur during the normal use of this equipment.
Please read the following chart before using this equipment.
Fire
Solvent Spray
Inhaling Toxic Substances
Explosion Hazard -
Incompatible Materials
General Safety
Cumulative Trauma
Disorders ("CTD's")
CTD's, or musculoskeletal
disorders, involve damage
to the hands, wrists,
elbows, shoulders, neck,
and back. Carpal tunnel
syndrome and tendonitis
(such as tennis elbow or
rotator cuff syndrome) are
examples of CTD's.
Solvent and coatings can be highly
flammable or combustible especially when
sprayed.
During use and while cleaning and flushing,
solvents can be forcefully expelled from
fluid and air passages. Some solvents can
cause eye injury.
Certain materials may be harmful if inhaled,
or if there is contact with the skin.
Halogenated hydrocarbon solvents - for
example; methylene chloride and 1,1,1, -
Trichloroethane are not chemically
compatible with the aluminum that might be
used in many system components. The
chemical reaction caused by these solvents
reacting with aluminum can become violent
and lead to an equipment explosion.
Improper operation or maintenance of
equipment.
Use of hand tools may cause cumulative
trauma disorders ("CTD's").
CTD's, when using hand tools, tend to affect
the upper extremities. Factors which may
increase the risk of developing a CTD include:
1. High frequency of the activity.
2. Excessive force, such as gripping,
pinching, or pressing with the hands and
fingers.
3. Extreme or awkward finger, wrist, or arm
positions.
4. Excessive duration of the activity.
5. Tool vibration.
6. Repeated pressure on a body part.
7. Working in cold temperatures.
CTD's can also be caused by such activities
as sewing, golf, tennis, and bowling, to name
a few.
Adequate exhaust must be provided to keep air free of
accumulations of flammable vapors.
Smoking must never be allowed in the spray area.
Fire extinguishing equipment must be present in the spray area.
Wear eye protection.
Follow the requirements of the Material Safety Data Sheet
supplied by your coating material manufacturer.
Adequate exhaust must be provided to keep the air free of
accumulations of toxic materials.
Use a mask or respirator whenever there is a chance of inhaling
sprayed materials. The mask must be compatible with the material
being sprayed and its concentration. Equipment must be as
prescribed by an industrial hygienist or safety expert, and be
NIOSH approved.
Due to the aluminum passageways in these guns, they must not
be used with these solvents. Aluminum is also widely used in
other spray application equipment – such as material pumps,
regulators, valves and cups. Check all equipment items before use
and make sure they can also be used safely with these solvents.
Read the label or data sheet for the material you intend to spray.
If in doubt as to whether or not a coating or cleaning material is
compatible, contact your material supplier.
Operators should be given adequate training in the safe use and
maintenance of the equipment (in accordance with the
requirements of NFPA-33, Chapter 15). Users must comply with all
local and national codes of practice and insurance company
requirements governing ventilation, fire precautions, operation,
maintenance, and housekeeping. These are OSHA Sections
1910.94 and 1910.107 and NFPA-33.
Pain, tingling, or numbness in the shoulder, forearm, wrist, hands,
or fingers, especially during the night, may be early symptoms of a
CTD. Do not ignore them. Should you experience any such
symptoms, see a physician immediately. Other early symptoms
may include vague discomfort in the hand, loss of manual
dexterity, and nonspecific pain in the arm. Ignoring early
symptoms and continued repetitive use of the arm, wrist, and
hand can lead to serious disability. Risk is reduced by avoiding or
lessening factors 1-7.
HAZARD CAUSE SAFEGUARDS

SB-2-511-A Page 3
PARTS REPLACEMENT
SRI-411 Packing Replacement Instructions
1. Remove adjusting knob and needle
spring from gun.
2. Partially withdraw needle from gun
body.
3. Loosen packing nut and remove.
4. Remove old packing.
5. Assemble packing nut to needle
6. Assemble packing in order shown to
needle.
7. Insert needle all the way into gun
body seating in tip.
8. Install needle spring and adjusting
knob.
9. Thread packing nut into gun body.
10. Tighten packing nut in equal
increments - no more than
1/6 turn at a time.
11. After each adjustment, pull needle
open and observe needle closure.
12. If needle snaps shut, continue
adjusting nut until there is evidence
of needle bind or slow closing.
13. Back off packing nut 1/12 turn or less
to the point where needle snaps shut.
Packing nut must remain tight enough
to prevent loosening by hand.
14. Pull needle several times to verify
needle snaps shut and check packing
nut for looseness.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to
clean cap holes, use a broom straw or tooth-
pick if possible. If a wire or hard instrument
is used, extreme care must be used to pre-
vent scratching or burring of the holes which
will cause a distorted spray pattern.
To clean fluid passages, remove excess
material from cup, then flush with a suitable
solvent. Wipe gun exterior with a solvent
dampened cloth. Never completely immerse
in solvent as this is detrimental to the lubri-
cants and packings.
NOTE
When replacing the fluid tip or
fluid needle, replace both at the
same time. Using worn parts can
cause fluid leakage. See Chart 1.
It is recommended that the fluid tip
seal (5) is replaced whenever the
fluid tip is removed. Also, replace
the needle packing at this time.
Lightly lubricate the threads of the
fluid tip before reassembling.
Torque to 6-7 ft-lbs. Do not over-
tighten the fluid tip.
To prevent damage to fluid tip (4)
or fluid needle (10), be sure to
either 1) pull the trigger and hold
while tightening or loosening the
fluid tip, or 2) remove fluid needle
adjusting screw (12) to relieve
spring pressure against needle
collar.
SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10* spray gun
lube at trigger bearing stud (19) and the
stem of air valve (15) where it enters air
valve assembly. The shank of fluid needle
(10) where it enters packing nut (9) should
also be oiled. Fluid needle packing (9)
should be lubricated periodically. Make sure
gun threads and retaining ring (2) threads
are clean and free of foreign matter. Before
assembling retaining ring to gun, clean the
threads thoroughly, then add two drops of
SSL-10 spray gun lube to threads. Fluid
needle spring (11) and air valve spring (14)
should be coated with a very light grease,
making sure that any excess grease will not
clog the air passages.
* Not for air tools or high RPM equipment.
For best results, lubricate the points indi-
cated, daily.
A. Trigger Points
B. Packing
C. Adjusting Knobs
D. Gun Threads
E. Air Valve Cartridge
CHART 1
No. on Air Air Cap with Ret. Ring Fluid Needle Used
Cap Order ➞(Ref. No. 1) With Fluid Tip ➞Fluid Tip No. Tip Size I.D.
in. mm.
215 SRI-407-215 SRI-37 SRI-2-08-K* .031 0.8
SRI-3 SRI-2-10-K* .039 1.0
SRI-3 SRI-2-12-K* .047 1.2
*Includes (1) SRI-6 fluid tip seal.
Packing Packing
Nut
Needle
Gun Body
A
B
C
E
D
A