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Nordson A7A Instruction Sheet
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Nordson A7A Instruction Sheet

Stainless steel valve
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A7A Stainless Steel Valve
1. Description
1999 Nordson Corporation
All rights reserved
WARNING: Allow only qualified personnel to perform the
following tasks. Follow the safety instructions in this document
and all other related documentation.
WARNING: System or material pressurized. Relieve pressure.
Failure to observe may result in serious burns.
See Figure 1. The valve is a compact stainless steel airless spray valve.
It may be used in a wide variety of applications, most specifically as a
component of the CanWorks manifold assembly.
Fig. 1 A7A Stainless Steel Valve
331 279A
Issued 6/99
Instruction Sheet
P/N 331 279A
0445001A
Manual 4-45

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Summary of Contents for Nordson A7A

  • Page 1 See Figure 1. The valve is a compact stainless steel airless spray valve. It may be used in a wide variety of applications, most specifically as a component of the CanWorks manifold assembly. 0445001A Fig. 1 A7A Stainless Steel Valve 1999 Nordson Corporation 331 279A Manual 4-45...

  • Page 2: Theory Of Operation

    A7A Stainless Steel Valve Theory of Operation See Figure 2. When the valve is actuated, air enters at the air input (1). This air lifts the piston/locknut assembly (2), and allows the packing cartridge (3) and the ball tip (4) to rise. The coating material passes through the opening in the seat (5), and exits the port (6).

  • Page 3: Installation

    Disassembly 1. Remove both the fluid and air pressure to the valve. 2. Remove the A7A valve from the manifold assembly. See Figure 3. Remove the screws (1), lockwashers (2), and cylinder (3) from the gun body (13).
  • Page 4 SO-ring, Viton, 0.208 ID x 0.070 in. wide, brown 940 090 SDisc, piston - - - - - NOTE A: This part is also available in the A7A Piston with seals repair kit, part 106 230. AR: As Required Continued on next page Manual 4-45...
  • Page 5 S Wrench 152 999 NOTE A: This part is also available in the A7A Piston with seals repair kit, part 106 230. B: This part is also available in the seat assembly service kit, part 330 242. C: This part is also available in the A7A valve EPR soft goods service kit, part 334 877.
  • Page 6 A7A Stainless Steel Valve Parts (contd.) 0445003A Fig. 3 Exploded View of the A7A Stainless Steel Valve Manual 4-45 331 279A 1999 Nordson Corporation All rights reserved Issued 6/99...

  • Page 7: Service Kits

    Item Part Description Quantity Note — 106 230 Service kit, piston with seals, A7A S Gasket, gun, H20 153 031 S Piston, assembly, H20 153 022 S S Piston, locknut, assembly - - - - - - SNut, seal, lock 240 274 S S O-ring, Viton, 0.208 ID x 0.070 in.
  • Page 8 940 176 NS: Not Shown Original copyright date 1999. CanWorks, Nordson, and the Nordson logo are registered trademarks of Nordson Corporation. Parker Lubricant is a registered trademark of Parker Seal. Viton is a registered trademark of E.I. DuPont de Nemours & Co.