DeVilbiss Cobra 1 User manual

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SB-E-2-CBA1 ISS.01
Operation Manual
Cobra 1 – Automatic Spray Gun
E P 1 – 12

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Operation Manual
Cobra 1 Automatic Spraygun
Important
Read and follow all instructions and Safety Precautions before using this
equipment
CHARACTERISTICS
This automatic spray gun complies to ATEX regulations 94/9/EC, protection level II 2 G X, suitable to
use in Zones 1 & 2.
This Cobra 1 is a production spray gun suitable for use with automatic and semi-automatic machine in
conventional, HVLP or Trans-Tech application.
To handle a wide range of coating materials the material passages are manufactured from high grade
stainless steel.
Fluid tips and needles are available in high grade stainless steel.
Pressure feed material supply can be re-circulating or direct.
The needle adjustment knob has 18 ratchet positions, allows fine and accurate fluid flow control.
SPECIFICATIONS & MATERIALS OF CONSTRUCTION
Thread Pressure
Fluid inlet & recirculation “P” 1/4 BSP Max 7 Bars
Air inlet (Atom+Fan) “A” “F” 1/4 BSP Max 7 Bars
Cylinder/trigger “Cyl” 1/8 BSP 4 to 7bars
Maximum temperature in use 40° C
Spray gun weight 720 gms
Gun body Aluminium hard anodized
Tip / Needle / Spray head Stainless steel 303
EC Declaration of Conformity
We, ITW Finishing UK, Ringwood Rd, Bournemouth, Dorset, BH11 9LH, UK, as the manufacturer of the
Spray gun model COBRA , declare, under our sole responsibility that the equipment to which this
document relates is in conformity with the following standards or other normative documents:
BS EN 292-1 PARTS 1 & 2: 1991, BS EN 1953: 1999; and thereby conform to the protection requirements
of Council Directive 98/37/EEC relating to Machinery Safety Directive, and;
EN 13463-1:2001, council Directive 94/9/EC relating to Equipment and Protective Systems intended for
use in Potentially Explosive Atmospheres protection level II 2 G X.
B. Holt, General Manager
24th April 2007
ITW Finishing Systems and Products reserve the right to modify equipment specification without prior notice.

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SAFETY WARNINGS
Fire and explosion
Solvents and coating materials can be highly flammable or combustible when sprayed.
ALWAYS refer to the coating material supplier’s instructions and COSHH sheets
before using this equipment.
Users must comply with all local and national codes of practice and insurance company
requirements governing ventilation, fire precautions, operation and house-keeping of
working areas.
This equipment, as supplied, is NOT suitable for use with Halogenated
Hydrocarbons.
Static electricity can be generated by fluid and/or air passing through hoses, by the
spraying process and by cleaning non- conductive parts with cloths. To prevent ignition
sources from static discharges, earth continuity must be maintained to the spray gun and
other metallic equipment used. It is essential to use conductive air and/or fluid hoses.
Personal Protective Equipment
Toxic vapours – When sprayed, certain materials may be poisonous, create irritation or
are otherwise harmful to health. Always read all labels, safety data sheets and follow any
recommendations for the material before spraying. If in doubt, contact your material
supplier.
The use of respiratory protective equipment is recommended at all times. The type of
equipment must be compatible with the material being sprayed.
Always wear eye protection when spraying or cleaning the spray gun.
Gloves must be worn when spraying or cleaning the equipment.
Training – Personnel should be given adequate training in the safe use of spraying equipment.
Misuse
Never aim a spray gun at any part of the body.
Never exceed the max. Recommended safe working pressure for the equipment.
The fitting of non-recommended or non-original spares may create hazards.
Before cleaning or maintenance, all pressure must be isolated and relieved from the equipment.
The product should be cleaned using a gun-washing machine. However, this equipment should
not be left inside gun-washing machines for prolonged periods of time.
Noise Levels
The A-weighted sound level of spray guns may exceed 85 dB (A) depending on the set-
up being used. Details of actual noise levels are available on request. It is recommended
that ear protection is worn at all times when spraying.
Operating
Spray equipment using high pressures may be subject to recoil forces. Under certain
circumstances, such forces could result in repetitive strain injury to the operator.

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LIST OF SPARE PARTS
Rep Ref Description Qty
1 SP-100-xxx-K Air cap and its retaining ring with seals. See chart 1
2
SP-200S-xx-K
SP-259S-xx-K
Tip with air separator seal
Ø 0,85 / 1,0 / 1,2 / 1,4 / 1,6
Ø 0,5 / 0,7 / 1,0 for Air cap 590
1
5 SP-623-K5 Air separator ring, kit of 5 1
6 S-14192-K4 Screw M4 x 25 kit of 4 Torx 20 4
8 SPA-40 Spray head for Cobra 1 1
9 SPA-41 Packing seal 1
10 SPA-10 Sealing washer 1
11 S-28221-K10 Gasket kit of 10 2
12 SPA-1-CBA1 Gun body for Cobra 1 1
13 AGG-403 Air valve 2
14 S-28220-K5 Kit of 5 Gasket 1
15 SPA-6-K Piston + O ring (Rep16) 1
16 S-28219-K10 Kit of 10 Gasket 2
17 SPA-13 Piston Spring 1
18 SPA-310-xx Stainless steel needle 0.5/0.7/0,85/1,0/1,2/1,4/1,6 1
19 SPA-3 Housing 1
20 1
21 SPA-KK-1 Kit of ring and ball for ratchet 3
22 AGMD-110 Spring 1
23 AGMD-111 Spring 1
24 SPA-19 Washer 1
25 SPA-4 Adjusting knob 1
26* SPA-7-K Kit rear housing without adjustment
27* SPA-22-K2 Kit of air connector for remote control
28* AGGS-33 Shaft
29* SS-659-CD Nut
30 S-18226 Plug ¼ BSP for spray gun without fluid recirculation 1
31 S-1444-H M5 hexagon socket head cap screw, length 8 2
32 SPA-26 Fluid insert plug 1
*Optional spare parts

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AIR CAP CHART AVAILABLE
Air cap Type Air Flow
(L / min)
At
Inlet
Pressure
(bar)
Fluid Flow
(ml / min)
Pattern
size (mm)
SP-100-430-K Conventional 340 3,5 200 - 280 200
SP-100-443-K Conventional 345 3,0 200 - 300 300
SP-100-497-K Conventional 510 3,5 200 - 600 380
SP-100-505-K H V L P 385 1,4 130 – 190 270
SP-100-510-K Trans-Tech 283 2,0 160 - 220 270
SP-100-513-K Trans-Tech 531 3,0 200 - 600 350
SP-100-522-K Trans-Tech 410 2,0 200 - 600 350
SP-100-590-K Trans-Tech 218 2,0 50 -150 150
STANDARD COMBINATION RECOMMENDED
CBA1 – 522 - 12 =[Type of gun] –[Air Cap] – [Ø Tip]
Type Conventional HVLP Trans-Tech
Air Cap N° 430 443 497 505 510 513 522 590
0,5 X
0,7 X
0,85 X X X X
1,0 X X X X X X X
1,1 X X X X
1,2 X X X X X X
1,4 X X X X
1,6 X
TIP
in
mm
Combination « X » are available and fitted as standard.
A Adjusting knob
B Head gun
C Baffle
D Air Cap
E Valve
F Body
P Product inlet
G Fluid tip

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INSTALLATION
Important : To ensure that this equipment reaches you in first class
condition, protective coatings have been used. Flush the equipment
through with appropriate solvent before use.
Fix the spray gun using mounting stem ref.28 and secure it with nut ref.29.
HOSES
Use separate filtered regulated air supplies for atomizing and cylinder air. Connect the cylinder air
‘CYL AIR’ on top of the body via a control valve. For fast cylinder operation the control valve should
be fitted as close to the gun as possible or an additional quick exhaust valve installed in the line.
Attach atomizing air hose to the inlet threaded hole ‘FAN & ATOM AIR’ under the gun body.
Connect material hose(s) ‘P’ to the spray head. If material re-circulation is required, remove plugs (30)
& (32). Fit standard connector (¼” BSP) to the spray head.
Recommended hose size up to 10m (34ft) long :
Atomization Air : 8mm, Cylinder Air : 6mm, Material : 9,5mm
SETTING
1. The ATOM ‘A’ air valve controls the atomizing air pressure FAN ‘F’ valve reduces the spray pattern
size. To increase the pressure turn clockwise, to reduce turn counter-clockwise.
2. Fluid flow can be adjusted with the rear ratchet knob, fluid flow is increased when you turn the knob
counter-clockwise.
3. For the arrangement of the parts, refer the exploded view at the end of the manual.
STARTING UP
1. Turn the needle adjusting knob (25) clockwise until the needle is fully closed.
2. Turn the FAN ‘F’ and ATOM ‘A’ air valves (13) counter-clockwise to be full open.
3. Use the air cap chart above to set the air pressure at the air regulator to achieve recommended
pressures above.
4. Turn the adjusting knob (25) counter clockwise to obtain the desired fluid flow.
5. Test spray. If the finish is too dry or fine, reduce the airflow by reducing the air inlet pressure or by
screwing the valve ATOM ‘A’ (13) in clockwise, or increase the fluid flow using ratchet knob, rotating
counter clockwise.
6. If the finish is too wet, turn the ratchet knob (25) in clockwise to reduce the fluid flow, or reduce the
fluid pressure.
If the atomization is too coarse, increase inlet air pressure, or reduce fluid flow.
7. The pattern size can be reduced by turning adjusting valve FAN ‘F’ (13) clockwise.
Important : The Spray gun must be earthed to dissipate any electrostatic
charges which may be created by fluid or air flows. This can be achieved
through the Spray gun mounting, or conductive air/fluid hoses. Electrical
bond from the spray gun to earth should be checked with an ohmmeter. A
resistance of less than 106Ohms is recommended.

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8. The spray pattern will give the best results when perpendicular to the target.
9. The recommended spray distance is 150-220 mm (6’’ to 8’’).
10. Spray edges first. Overlap each stroke a minimum of 50%. Move gun at a constant speed.
11. Always turn off air and fluid supply and relieve pressure and clean down when gun is not in us.
PREVENTIVE MAINTENANCE
1. Turn off air and coating supply and relieve pressure in the supply lines, or disconnect from airline and
fluid line.
2. Remove air cap (1) and clean. If any of the holes in the cap are blocked with coating material use a
toothpick to clean. Never use metal wire which could damage the cap and produce distorted spray
patterns
3. Ensure the nozzle of the fluid tip (2) is clean and free from damage. Any build up of dried paint can
distort the spray pattern.
REPLACEMENT OF PARTS
Turn off air and coating supply and relieve pressure in the supply lines, before any maintenance
operation.
Tip (2) & needle (18)
Remove the air cap (1) by unscrewing its retaining ring counter- clockwise.
Remove the tip (2) and its air separator ring (3) by unscrewing by unscrewing counter- clockwise with
10mm hexagonal spanner.
Unscrew the adjusting needle knob (25) fully in counter-clockwise rotation, push the needle from the
front of the spay gun, carefully so to avoid damage the needle end, then pull out the needle (18) from
the back.
If necessary, replace the needle and the tip, first screw the tip with its air separator ring (recommended
torque between 9,5 to 12 Nm).
Lubricate all the surface of the needle which will be in contact with the packing and o ring. Slide the
needle into the spray gun from the back.
Fit the needle springs with its plastic pad (22,23,24) and screw the needle adjusting knob (25).
Packing seal (9)
Unscrew the air cap (1), tip (2) and its air separator ring (3).
Unscrew the 4 screws (6) to disassemble the gun head (8).
Push back the packing seal (9) using a rod diameter 5,5mm from the front of the gun head. Clean the
packing location hole carefully with adequate solvent.
Fit a new packing seal (9) U face towards the fluid passage.

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Fan & Atom air valve (13)
Before assembling, check the air valve is in fully open position by unscrewing
it counter-clockwise.
Piston (15), O ring (16) & (14)
Unscrew the rear housing (19) at the back of the gun body
counter clockwise, pull out the needle (18).
Use bent nose pliers so to pull out the piston which has a 12mm
internal groove for this purpose.
It’s recommended to replace the o ring (14) into the gun body as
soon you disassemble the Piston.
If necessary, when replacing the piston, slightly lubricate the
piston lip before fitting into the gun body.

OPTIONS
Spray gun without needle adjustment
Part number: SPA-7-K
This kit includes the back piece and washer to replace the part items 19, 20,
21, 24, 25, on the exploded view.
Spray gun with “Atom” & “fan” remote control
Parts number: SPA-22-K2
This includes 2 connectors taking place of the two 2 air valves (13) on the
exploded view.
Spray gun shaft
Part number: AGGS-33
Nut for spray gun shaft
Part number: SS-659-CD
Ring to index air cap with spray gun head
Part number : SPA-112 : Indexed ring 0 & 90°