Nordson A7A Customer Product Manual
Single and dual automatic airless spray guns
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A7A Single and Dual
Automatic Airless Spray Guns
Customer Product Manual
Part 1072640A
Issued 7/19
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at (800) 433-9319 or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.
NORDSON CORPORATION • AMHERST, OHIO • USA
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Table of Contents
Related Manuals for Nordson A7A
Summary of Contents for Nordson A7A
- Page 1 For parts and technical support, call the Industrial Coating Systems Customer Support Center at (800) 433-9319 or contact your local Nordson representative. This document is subject to change without notice. Check http://emanuals.nordson.com for the latest version. NORDSON CORPORATION • AMHERST, OHIO • USA...
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Page 2: Table Of Contents
......Contact Us Notice This is a Nordson Corporation publication which is protected by copyright. Nordson Corporation welcomes requests for information, comments, and Original copyright date 1987. No part of this document may be inquiries about its products. -
Page 3: Safety
Regulations and Approvals Make sure all equipment is rated and approved for the environment in which it is used. Any approvals obtained for Nordson equipment will be voided if instructions for installation, operation, and service are not followed. Part 1072640A... -
Page 4: Personal Safety
A7A Single and Dual Automatic Airless Spray Guns Personal Safety To prevent injury follow these instructions. Do not operate or service equipment unless you are qualified. Do not operate equipment unless safety guards, doors, or covers are intact and automatic interlocks are operating properly. Do not bypass or disarm any safety devices. -
Page 5: Fire Safety
A7A Single and Dual Automatic Airless Spray Guns The National Spray Equipment Manufacturers Association has created a wallet card that you should carry when you are operating high-pressure spray equipment. These cards are supplied with your equipment. The following is the text of this card: WARNING: Any injury caused by high pressure liquid can be serious. -
Page 6: Halogenated Hydrocarbon Solvent Hazards
A7A Single and Dual Automatic Airless Spray Guns Fire Safety (contd) Provide adequate ventilation to prevent dangerous concentrations of volatile particles or vapors. Refer to local codes or your material MSDS for guidance. Do not disconnect live electrical circuits when working with flammable materials. -
Page 7: Description
A7A guns to one straight or angled dual-chamber gun, or a straight dual-chamber gun to an angled gun. Refer to the A7A Gun List on page 14 for a list of all available models. Single-Chamber... -
Page 8: Theory Of Operation
A7A Single and Dual Automatic Airless Spray Guns Theory of Operation See Figure 2. This figure shows a cutaway view of a dual-chamber A7A gun. The dual-chamber gun is two single-chamber guns mounted on a manifold, sharing a single nozzle. Only one chamber is triggered at a time. -
Page 9: Installation
A7A Single and Dual Automatic Airless Spray Guns Installation WARNING: Allow only qualified personnel to perform the following tasks. Follow the safety instructions in this document and all other related documentation. Figure 3 shows a typical coating system installation. 1300452A... -
Page 10: Trigger Air Connection
See Figure 4. Refer to Options on page 15 for the air-release valve part number. The air-release valve reduces the cycle time of the A7A gun, if the speed of operation is less than 600 cycles per minute. may be used when the electro-pneumatic solenoid valve cannot be installed on the gun. -
Page 11: Maintenance
A7A Single and Dual Automatic Airless Spray Guns Maintenance Flush the gun periodically to keep the fluid passageways and ball and seat clean and free of contaminants. As required, disassemble and clean the gun and replace any worn parts. Make sure the trigger air is clean and dry. Lubricate the air supply if operating at high speeds for long periods of time. -
Page 12: Repair
A7A Single and Dual Automatic Airless Spray Guns Repair WARNING: Allow only qualified personnel to perform the following tasks. Follow the safety instructions in this document and all other related documentation. WARNING: Relieve trigger air pressure and system fluid pressure before disconnecting air and fluid hoses to the spray gun. - Page 13 A7A Single and Dual Automatic Airless Spray Guns Apply O-ring lubricant part 900223 (Parker O-Lube or equivalent) before installing. Apply Loctite 242 Removable thread adhesive or equivalent to threads before tightening. NOTE: Ball or Needle and Seat are matched sets and must be replaced together.
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Page 14: Assembly
A7A Single and Dual Automatic Airless Spray Guns Assembly NOTE: Lubricate all O-rings with Parker O-Lube or equivalent before installing. See Figure 5. 1. If removed, install the O-ring (10) in the groove in the body (11). 2. Install the ball or needle (16A−D) on the end of the packing cartridge (15). -
Page 15: Parts
A dash (—) is used when the part number applies to all parts in the illustration. The number in the Part column is the Nordson Corporation part number. A series of dashes in this column (- - - - - -) means the part cannot be ordered separately. -
Page 16: Quick Reference
A7A Single and Dual Automatic Airless Spray Guns Quick Reference A7A Gun List Part Description Page Single-Chamber Guns 153150 Standard, single chamber, with ball and seat 248445 Standard, single chamber, with needle and seat 342276 High pressure, non-corrosive, single chamber, with nickel-carbide ball and seat... -
Page 17: Service Parts, Kits, And Options
A7A Single and Dual Automatic Airless Spray Guns Service Parts, Kits, and Options Part Description Usage Replacement Packing Cartridges 153152 Standard, compound, dual-chamber 153150, 510010, 248937, 709831, 160062 153090 Stainless steel 248445, 342276, 153160, 337303, 245375, 342300, 149097, 337302, 160063,... -
Page 18: Single Chamber Guns
A7A Single and Dual Automatic Airless Spray Guns Single Chamber Guns See Figure 7 on page 24 and associated parts lists for Compound and Extended A7A Guns. Ball (High-Pressure Models Only) Needle 1300455A Figure 6 Single Chamber Guns (Except Compound and Extended Valve Guns) -
Page 19: With Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns Standard Single-Chamber Gun with Ball and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 153150 GUN, A7A, automatic, circulating 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 20: With Needle And Seat
A7A Single and Dual Automatic Airless Spray Guns Standard Single-Chamber Gun with Needle and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 248445 GUN, A7A, automatic, circulating, tapered needle and seat 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 21: High Pressure, Non-Corrosive Single-Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns High Pressure, Non-Corrosive Single-Chamber Gun with Nickel-Carbide Ball and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 342276 GUN, A7A, high pressure, non-corrosive 702105 S SCREW, fillister, #10-32 x 1.00 in., stainless... -
Page 22: High Speed Single-Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns High Speed Single-Chamber Gun with Nickel-Carbide Ball and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 246789 GUN, A7A, high speed 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 23: Stainless Steel Single-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Single-Chamber Gun with Needle and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 153160 GUN, A7A, stainless steel, automatic, circulating 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 24: Stainless Steel Waterborne Single-Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Waterborne Single-Chamber Gun with Nickel-Carbide Ball and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 337303 GUN, A7A, stainless steel, waterborne 702105 S SCREW, fillister, #10-32 x 1.00 in., slotted,... -
Page 25: Large Passage Single-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Large Passage Single-Chamber Gun with Ball and Seat See Figure 6 on page 16. Item Part Description Quantity Note — 709831 GUN, A7A, large passage, auto, circulating 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 26: Compound And Extended Guns
A7A Single and Dual Automatic Airless Spray Guns Compound and Extended Guns Refer to parts lists on following pages. Compound Ball and Seat Extended Needle and Seat 1300456A Figure 7 Single Chamber Compound and Extended Guns Part 1072640A E 2019 Nordson Corporation... -
Page 27: Compound Single-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Compound Single-Chamber Gun with Ball and Seat See Figure 7 on page 24. Item Part Description Quantity Note — 510010 GUN, Model A7A, 1 1/2 in. extension 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 28: Extended Single-Chamber Gun With Needle And Seat
A7A Single and Dual Automatic Airless Spray Guns Extended Single-Chamber Gun with Needle and Seat See Figure 7 on page 24. Item Part Description Quantity Note — 245375 GUN, A7A, with valved extension 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 29: Straight Dual-Chamber Guns
A7A Single and Dual Automatic Airless Spray Guns Straight Dual-Chamber Guns See Figure 9 on page 32 and associated parts lists for angled dual-chamber guns. Ball (High-Pressure Needle Models Only) 1300457A Figure 8 Dual-Chamber Guns Part 1072640A E 2019 Nordson Corporation... -
Page 30: Standard Straight Dual-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Standard Straight Dual-Chamber Gun with Needle and Seat See Figure 8 on page 27. Item Part Description Quantity Note — 248937 GUN, A7A, dual, drum coating 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 31: High Pressure, Non-Corrosive Straight Dual Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns High Pressure, Non-Corrosive Straight Dual Chamber Gun with Nickel-Carbide Ball and Seat See Figure 8 on page 27. Item Part Description Quantity Note — 342300 GUN, A7A, dual, high pressure, non-corrosive 702105 S SCREW, fillister, #10-32 x 1.00 in., stainless... -
Page 32: Stainless Steel Straight Dual-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Straight Dual-Chamber Gun with Needle and Seat See Figure 8 on page 27. Item Part Description Quantity Note — 149097 GUN, A7A, dual, stainless steel, drum coating 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 33: Stainless Steel Waterborne Straight Dual-Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Waterborne Straight Dual-Chamber Gun with Nickel-Carbide Ball and Seat See Figure 8 on page 27. Item Part Description Quantity Note — 337302 GUN, A7A, dual, stainless steel, waterborne 702105 S SCREW, fillister, #10-32 x 1.00 in., stainless... -
Page 34: Angled Dual Chamber Guns
A7A Single and Dual Automatic Airless Spray Guns Angled Dual Chamber Guns See Figure 8 on page 27 and associated parts lists for dual-chamber guns. Ball Needle 1300458A Figure 9 Angled Dual-Chamber Guns Part 1072640A E 2019 Nordson Corporation... -
Page 35: Standard Angled Dual-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Standard Angled Dual-Chamber Gun with Ball and Seat See Figure 9 on page 32. Item Part Description Quantity Note — 160062 GUN, dual, A7A, drum, angled, standard 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 36: Stainless Steel Angled Dual-Chamber Gun
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Angled Dual-Chamber Gun with Needle and Seat See Figure 9 on page 32. Item Part Description Quantity Note — 160063 GUN, dual, A7A, drum, angled, stainless steel 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 37: Waterborne Angled Dual-Chamber Gun With Nickel-Carbide Ball And Seat
A7A Single and Dual Automatic Airless Spray Guns Waterborne Angled Dual-Chamber Gun with Nickel-Carbide Ball and Seat See Figure 9 on page 32. Item Part Description Quantity Note — 337304 GUN, dual, A7A, angled, waterborne 702105 S SCREW, fillister, #10-32 x 1.00 in., stainless... -
Page 38: Service Kits
A7A Single and Dual Automatic Airless Spray Guns Service Kits For more information on the guns these kits are used with, refer to Service Parts, Kits, and Options on page 15. Piston and Seals Kit Use this kit for all guns except high pressure guns. -
Page 39: Single-Chamber Needle And Seat Kit
A7A Single and Dual Automatic Airless Spray Guns Single-Chamber Needle and Seat Kit Use this kit for the standard and stainless steel single-chamber guns (248445, 153160). Item Part Description Quantity Note — 106280 SERVICE KIT, needle and seat, tapered, A7A... -
Page 40: Angled Dual-Chamber Ball And Seat With Retainer Kit
A7A Single and Dual Automatic Airless Spray Guns Angled Dual-Chamber Ball and Seat with Retainer Kit Use this kit for the standard angled dual chamber gun (160062). Item Part Description Quantity Note — 134972 SERVICE KIT, ball and seat, with retainer... -
Page 41: Conversion Kits
A7A Single and Dual Automatic Airless Spray Guns Conversion Kits Air Cylinder with Detent Adjustment Item Part Description Quantity Note — 106311 CONVERSION KIT, air cylinder, detent 246252 S SCREW 986013 S RETAINING RING, external, 34, basic 246928 S WASHER, flat, 0.349 in. ID, special 981140 S SCREW, fillister, #10-32 x 1.00 in., slotted, zinc... -
Page 42: High Pressure Conversion Kit
A7A Single and Dual Automatic Airless Spray Guns High Pressure Conversion Kit This kit increases the maximum operating pressure of a gun to 206 bar (3000 psi). Item Part Description Quantity Note — 248941 CONVERSION KIT, A7A, high pressure - - - - - -... -
Page 43: Stainless Steel Angled Dual-Chamber Gun With Needle And Seat Conversion Kit
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Angled Dual-Chamber Gun with Needle and Seat Conversion Kit See Figure 12. This kit converts two stainless steel single-chamber guns or one stainless steel dual-chamber gun into an angled dual-chamber gun with needle and seat. -
Page 44: Stainless Steel Straight Dual Chamber Gun Retrofit Kit
A7A Single and Dual Automatic Airless Spray Guns Stainless Steel Straight Dual Chamber Gun Retrofit Kit This kit converts two single-chamber stainless steel guns into one straight dual-chamber gun with needle and seat. Item Part Description Quantity Note — 248939... - Page 45 Automatic Airless Spray Applicators, A7A Models : A7A Single, A7A Dual, A7A Extended Lancing Description: These are all air operated high pressure airless spray guns. The Lancing one listed above is used for lancing into an object to be coated.
- Page 46 A7A Single and Dual Spray Guns Service Kits and Parts Refer to A7A Manual 1072640 for complete service and parts information. For parts and technical support call (800) 433-9319. Piston and Seals Kit Ball and Seat/Needle and Seat Kits B, C...