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Nordson RA-20 Instruction Sheet
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Nordson RA-20 Instruction Sheet

Nordson RA-20 Instruction Sheet

Paint/solvent/dump valve
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Description
Removal
Installation
E 2018 Nordson Corporation
RA-20 Paint/Solvent/Dump Valve
The paint/solvent valve is a normally closed valve used to trigger coating
material. The valve may be used alone to actuate paint or solvent within the
rotary atomizer, or may be coupled with a dump valve for paint actuation
and dump.
2
Figure 1
Paint/Solvent/Dump Valve
1. Fluid Inlet
Refer to the Repair section in the RA-20 Rotary Atomizer manual for a
detailed description of removing the valve from the rotary atomizer.
Based on the system they are used with, the paint/solvent/dump valves can
be installed in several possible configurations. Single-, dual-, and
three-valve installations allow the valves to function in a variety of ways.
Figures 2 and 3 show all four possible installations which may be used to
actuate paint from within the rotary atomizer. The dual-valve can be
installed as a paint/dump (installation B), or a paint/solvent valve
configuration (installation C). The three-valve installation (installation D),
can be used as a paint/solvent/dump valve configuration. For part numbers
of reference items, refer to the parts list at the end of this document.
Instruction Sheet
P/N 237431-03
1
2. Air Inlet
Part 237431-03

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Summary of Contents for Nordson RA-20

  • Page 1 1. Fluid Inlet 2. Air Inlet Removal Refer to the Repair section in the RA-20 Rotary Atomizer manual for a detailed description of removing the valve from the rotary atomizer. Installation Based on the system they are used with, the paint/solvent/dump valves can be installed in several possible configurations.
  • Page 2 Paint/Dump Installation See Figure 2. Installation B. The dual-valve installation shown is typical in RA-20 rotary atomizers, where the two valves are used for paint and dump. To install the two valves, perform the following steps: 1. Loosen the two cap screws (6) in the dual-port manifold (5).
  • Page 3 Paint/Solvent Installation See Figure 3, Installation C. The dual-valve installation shown is typical in RA-20 rotary atomizers where the two valves are used for paint and solvent. To install the two valves, perform the following steps: 1. Loosen the two cap screws (3) in the dual-port manifold (2).
  • Page 4 RA-20 Paint/Solvent/Dump Valve Rotary Atomizer Installations Diagram A. Single Valve B. 2−Valve (RA-20, typical) Figure 2 Rotary Atomizer Installations A and B 1. Air inlet 4. Screws 7. Dump valve 2. Paint valve 5. Dual-port manifold 8. O-ring 3. Fluid inlet 6.
  • Page 5 RA-20 Paint/Solvent/Dump Valve C. 2−Valve (RA-20) D. 3−Valve (RA-20) Figure 3 Rotary Atomizer Installations C and D 1. Paint valve 4. Solvent valve 6. Dump valve 2. Dual-port manifold 5. Screws 7. O-ring 3. Cap screws Part 237431-03 E 2018 Nordson Corporation...

  • Page 6: Operation

    RA-20 Paint/Solvent/Dump Valve Operation The following information describes how paint/solvent/dump valves operate in single-, dual-, and three-valve installations. All valve installations require a minimum air pressure of 2.75 bar (40 psi). Single-Valve When air pressure is applied at the air inlet, the valve opens to dispense coating material.
  • Page 7 RA-20 Paint/Solvent/Dump Valve Figure 5 Dual Valve Operation 1. Fluid Inlet 3. Air Inlet Port of Secondary Valve 2. Dump Port Three-Valve Three-valve installations are typically used in applications that require the use of paint, solvent, and dump valves, such as quick color-change applications.
  • Page 8 (13, 14). 4. Remove and discard the O-ring (12) from the valve body (13, 14). 5. Using the Nordson wrenches provided, remove the lock nut (5) from the piston lock nut assembly (6). 6. Remove the screws (23) that attach the valve seat (21, 22) to the valve body (13, 14).
  • Page 9 RA-20 Paint/Solvent/Dump Valve Assembly To reassemble the valve, follow these procedures. 1. Coat the packing cartridge (9) and new O-rings (11) with a small amount of non-detergent grease. 2. Install the O-rings into the valve body (13, 14). 3. Install the packing cartridge (9) into the valve body.
  • Page 10 S LUBRICANT, O-ring, Parker, 2 oz NOTE A: This part is also included in Air Piston Kit, part 302136. B: Refer to Air Piston Kit. C: These parts are included in RA-20 Valve Repair Kit, part 295393. Part 237431-03 E 2018 Nordson Corporation...
  • Page 11 RA-20 Paint/Solvent/Dump Valve Figure 6 Paint/solvent/dump Valve, Exploded View Part 237431-03 E 2018 Nordson Corporation...
  • Page 12 OD, clr 940162 S O-RING, PTFE, 0.625 x 0.759 x 0.062 in. 981737 S SCREW, skt, 10-32 x 2.000 in. , zinc 295351 S PLUG, valve dummy RA-20 Dump Solvent Valves Kit Part Description Quantity 295410 KIT, RA-20, dump/solvent valves 302134...
  • Page 13 S S RETAINER, piston NS: Not Shown Issued 3/18 Original copyright date 1999. Nordson and the Nordson logo are registered trademarks of Nordson Corporation. Delrin and Viton are registered trademarks of E.I. DuPont de Nemours & Co. Part 237431-03 E 2018 Nordson Corporation...
  • Page 14 RA-20 Paint/Solvent/Dump Valve Part 237431-03 E 2018 Nordson Corporation...