DeVilbiss Cobra 1 User manual

SB-E-2-CBA1 ISS.01

Operation Manual

Cobra 1 – Automatic Spray Gun

E P 1 – 12

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.

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.

LIST OF SPARE PARTS

Rep Ref Description Qty

1 SP-100-xxx-K Air cap and its retaining ring with seals. See chart 1

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

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

AIR CAP CHART AVAILABLE

Air cap Type Air Flow

(L / min)

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

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

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.

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.

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°

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