Air Caps and Fluid Nozzles. Graco 3A4798F, Pro Xp Waterborne Auto Air Spray Gun

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Air Caps and Fluid Nozzles. Graco 3A4798F, Pro Xp Waterborne Auto Air Spray Gun | Manualzz

Air Caps and Fluid Nozzles

Air Caps and Fluid Nozzles

Fluid Nozzle Selection Chart

To reduce the risk of an injury, follow the

Pressure Relief Procedure

before remov ing or installing a fluid nozzle and/or air cap.

Fluid Nozzle

Part No.

25N831

25N832

25N833

25N834

24N620

24N621

24N622

24N623

24N624

24N625

24N619

24N613

26D094

25N895

25N896

24N616

25N897

24N618

24N729

25N835

Orifice Size, mm (in.)

0.55 (.022)

0.75 (.029)

0.9 (.035)

1.0 (.042)

1.2 (.047)

1.5 (.055)

1.8 (.070)

2.0 (.079)

1.0 (.042)

1.2 (.047)

1.5 (.055)

1.8 (.070)

0.75 (.029)

1.0 (.042)

1.2 (.047)

1.5 (.055)

1.8 (.070)

2.0 (.079)

---------

Color

Black

Black

Black

Green

Gray

Black

Brown

Black

Green

Gray

Black

Brown

Blue

Black

--------Black

Description

Standard nozzles (STD) for standard coatings

Precision high wear nozzles (PHW) with hardened SST seat and damage resistant SST tip; for stan dard coatings, abrasives, and metallics

High wear nozzles (HW) with hardened ceramic seat, for abrasives and metallics

Round spray large pattern nozzle for use with large pattern round spray air cap only

Round spray medium or small pattern nozzle for use with medium or small pattern round spray air caps only

3A4798F 51

Air Caps and Fluid Nozzles

Fluid Nozzle Performance Charts

Use the following procedure to select the proper fluid nozzle for your application.

Table 6: Orifice Size: 0.75 mm (0.030 in.)

1. For each fluid nozzle performance chart, find the point on the graph corresponding to your desired flow rate and viscosity. Mark the point on each graph with a pencil.

2. The thick vertical line in each graph represents the target flow rate for that nozzle size. Find the graph that has the marked point closest to the thick verti cal line. This is the recommended nozzle size for your application. Significantly exceeding the target flow rate may result in lower spray performance due to excessive fluid viscosity.

3. From the marked point, move across to the vertical scale to find the required fluid pressure. If the required pressure is too high, use the next largest nozzle size. If the fluid pressure is too low, (<0.35 bar, 3.5 kPa, 5 psi), use the next smallest nozzle size.

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

Key to Fluid Nozzle Performance Charts

NOTE: Fluid pressures are measured at the spray gun inlet.

Table 7: Orifice Size: 1.0 mm (0.040 in.)

260 Centipoise Fluid

160 Centipoise Fluid

70 Centipoise Fluid

20 Centipoise Fluid

Table 5: Orifice Size: 0.55 mm (0.022 in.)

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

52 3A4798F

Table 8: Orifice Size: 1.2 mm (0.047 in.)

Air Caps and Fluid Nozzles

Table 10: Orifice Size: 1.8 mm (0.070 in.)

FLUID

PRESSURE bar, psi

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

Table 9: Orifice Size: 1.5 mm (0.059 in.)

FLUID FLOW: oz/min, cc/min

Table 11: Orifice Size: 2.0 mm (0.079 in.)

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

FLUID

PRESSURE bar, psi

FLUID FLOW: oz/min, cc/min

3A4798F 53

Air Caps and Fluid Nozzles

Air Cap Selection Chart

To reduce the risk of an injury, follow the

Pressure Relief Procedure before remov

ing or installing a fluid nozzle and/or air cap.

The charts in this section can assist you in selecting an air cap.

• Keep in mind that more than one air cap can meet your finish requirements.

• When selecting an air cap, consider coating properties, part geometry, pattern shape, pattern size, and operator preferences.

NOTE: All air cap pattern shapes and lengths in the fol lowing chart were measured under the following condi tions. Pattern shape and length are material dependent.

Air pressures are measured at the inlet of the gun.

• Distance to target: 10 in. (254 mm)

• Atomizing air pressure: 20 psi (138 kPa, 1.38 bar)

• Fan air pressure: 20 psi (138 kPa, 1.38 bar)

• Fluid flow rate: 10 oz/min (300 cc/min)

54 3A4798F

Air Caps and Fluid Nozzles

Pattern Shape

NOTE: Pattern shapes are influenced by the material viscosity, flow rate, and air pressure settings. The gun may not maintain the intended design shape under all conditions.

• Round patterns have a swirling, slow, round cone pattern for excellent finish and transfer efficiency.

• Fan patterns have two styles: round ends and tapered ends.

• Fan patterns with round ends are versatile. They can be used in any application and are often the best option for smaller parts or cut-in painting.

• Fan patterns with tapered ends are best for achieving even coating thickness with overlapping paint passes.

3A4798F 55

Air Caps and Fluid Nozzles

General Fan Pattern Air Caps: Descriptions

Part No.

Color

24N477 Black

24W279

24N438

Green

Black

24N376

24N276

24N277

24N278

24N274

Black

Blue

Red

Green

Black

Description

Standard

Alternate

Long Pattern

Short Pattern

Guidelines for Use

Most versatile air cap. Recommended for most materials and applications. Class

A finish. Often used in waterborne applications.

Similar to the standard air cap with an alternate arrangement of atomizing air.

Longest spray pattern, optimized for painting large parts with overlapping paint passes. Often used in waterborne applications.

Shorter pattern, optimized for painting with overlapping passes.

General Fan Pattern Air Caps: Specifications

Part No.

Color

24N477

24W279

24N438

24N376

24N276

24N277

24N278

24N274

Black

Green

Black

Black

Blue

Red

Green

Black

Description

Standard

Alternate

Long Pattern

Short Pattern

Pattern

Shape

Nominal

Pattern

Length in. (mm)

Round end 15-17

(381-432)

Round end 15-17

(381-432)

Tapered end

17-19

(432-483)

Tapered end

12-14

(305-356)

Recommended

Fluid Viscosity*

Recommended

Production

Rates**

Light to medium Standard

Light to medium Standard

Light to medium Standard

Light to medium Standard

Atomi zation

Best

Best

Better

Good

Cleanli ness

Good

Good

Better

Best

*Fluid Viscosity, in centipoise (cp) at 70°F (21°C).

Centipoise = centistokes x fluid specific gravity.

Light to medium

Medium to heavy

High solids

20–70 cp

70–360 cp

360+ cp

**Recommended Production Rates

Standard

Low

High

Very High

300 cc/min to 500 cc/min (10 oz/min to 17 oz/min)

100 cc/min to 300 cc/min (3 oz/min to 10 oz/min)

500 cc/min to 600 cc/min (17 oz/min to 20 oz/min)

600 cc/min to 750 cc/min (20 oz/min to 25 oz/min)

56 3A4798F

Air Caps and Fluid Nozzles

Specialty Fan Pattern Air Caps: Descriptions

Part No.

Color

25E670 Black

24N275

24N279

24N439

25E671

Black

Black

Black

Black

Description

Soft Spray

Aerospace

Solids

Solids High

Flow

HVLP

Guidelines for Use

For painting small, lightweight parts with a slow-moving spray pattern. Optimized for low production rates.

Optimized for aerospace coatings.

• Class A finish

• Light, medium, and heavy viscosity, and high solid coatings

• Very high production rates

Optimized for medium and heavy viscosity and high solid coatings at standard pro duction rates.

Required for use with 2.0 mm nozzles. Optimized for medium and heavy viscosity and high solid coatings at high production rates.

For applications where HVLP is required.

Specialty Fan Pattern Air Caps: Specifications

Part No.

Color

25E670

24N275

Black

Black

Description Pattern

Soft Spray

Aerospace

Shape

Nominal

Pattern

Length in. (mm)

Round end 10-12

(254-305)***

Tapered end 14-16

(356-406)

24N279 Black

24N439

25E671

Black

Black

Solids

Solids High

Flow

Tapered end 11-13

(279-330)

HVLP

Round end 14-16

(356-406)

Round end 14-16

(356-406)

Recommended

Fluid Viscosity*

Light to medium

Recom mended

Production

Rates**

Low

Light, medium, and heavy viscosity, and high solids

Medium to heavy viscosity and high solids

Medium to heavy viscosity and high solids

Light to medium

Very High

Standard

High

Standard

Atomi zation

Better

Good

Best

Best

Good

Cleanli ness

Good

Best

Good

Better

Good

*Fluid Viscosity, in centipoise (cp) at 70°F (21°C).

Centipoise = centistokes x fluid specific gravity.

Light to medium

Medium to heavy

High solids

20–70 cp

70–360 cp

360+ cp

**Recommended Production Rates

Standard

Low

High

Very High

300 cc/min to 500 cc/min (10 oz/min to 17 oz/min)

100 cc/min to 300 cc/min (3 oz/min to 10 oz/min)

500 cc/min to 600 cc/min (17 oz/min to 20 oz/min)

600 cc/min to 750 cc/min (20 oz/min to 25 oz/min)

***The soft spray air cap was measured with the fluid flow rate adjusted to 3.5 oz/min (100 cc/min).

3A4798F 57

Air Caps and Fluid Nozzles

Round Pattern Air Caps: Descriptions

Part No.

Color

24N318 Black

25N837

25N836

Black

Black

Description

Large Pattern

Medium Pattern

Small Pattern

Guidelines for Use

Conventional round pattern design for larger patterns up to 8 in (20 cm). Swirling, slow, round cone pattern for excellent finish and transfer efficiency.

Dual inner and outer atomizing air design for improved atomization at low air flows.

For medium patterns up to 6 inches (15cm). Swirling, slow, round cone pattern for excellent finish and transfer efficiency.

Dual inner and outer atomizing air design for improved atomization at low air flows.

For small patterns up to 4 inches (10cm). Swirling, slow, round cone pattern for excellent finish and transfer efficiency.

Round Pattern Air Caps: Specifications

Part No.

Color

24N318

25N837

25N836

Black

Black

Black

Description Pattern

Shape

Nominal

Pattern

Diameter in. (mm)

Large Pattern Round end 8 (203)

Medium Pattern Round end 6 (152)

Small Pattern Round end 4 (102)

Recommended

Fluid Viscosity*

Recommended

Production Rates

Atomi zation

Light to medium Low

Light to medium Low

Light to medium Low

Good

Better

Better

Cleanli ness

Good

Good

Good

*Fluid Viscosity, in centipoise (cp) at 70°F (21°C).

Centipoise = centistokes x fluid specific gravity.

Light to medium 20–70 cp

Medium to heavy

High solids

70–360 cp

360+ cp

**Recommended Production Rates

Standard

Low

High

Very High

300 cc/min to 500 cc/min (10 oz/min to 17 oz/min)

100 cc/min to 300 cc/min (3 oz/min to 10 oz/min)

500 cc/min to 600 cc/min (17 oz/min to 20 oz/min)

600 cc/min to 750 cc/min (20 oz/min to 25 oz/min)

58 3A4798F

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