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3

Flushing 

Use this procedure when changing color, and before

shutting down the system for the night or for extended

periods.
1. Remove the cup assembly.  Refer to 

Removing

and Installing the Cup Assembly and Nozzle

.

2. Turn on the system compressed air and electrical

power.

3. Start the spray-booth exhaust fan.
4. Supply a solvent or cleaning solution compatible

with your coating material to the trigger valve.

NOTE:  

If the cup assembly is installed on the turbine,

turn on turbine air before triggering the valve.  The

turbine should be rotating to prevent solvent from

possibly backing up behind the cup and flowing into

the turbine.

5. Trigger the valve and let the solvent or cleaning

solution flow through the RA-20R rotary atomizer

for several seconds.

6. If you are changing coatings, supply the new

coating material to the trigger valve.  Trigger the

valve until the coating material flushes out the

solvent or cleaning solution.

Removing and Installing the

Cup Assembly and Nozzle 

Follow this procedure to remove and install the cup

assembly and nozzle.

WARNING: 

 Shut off the turbine air, turn off

the electrostatic voltage, and relieve the fluid

pressure before you perform the following

tasks.  Failure to observe this warning may

result in equipment damage, personal injury,

or even death.

1. See Figure 1.  Insert the 

1

/

8

-in. hex-key ball

driver (2), supplied with the RA-20R rotary

atomizer, through the hole and duckbill seal in the

side of the charge ring (1).

2. Rotate the cup (4) and push on the driver until it

drops into the hole in the turbine shaft.

3. Hold the driver and turn the cup counterclockwise

(as viewed from the front) to unscrew it from the

turbine shaft.

4. Unscrew the nozzle (5) from the end of the fluid

tube.

5. Make sure the new nozzle has an O-ring (6)

installed on it.  Thread the new nozzle into the fluid

tube and tighten it finger-tight.

6. Insert the 

5

/

16

-in. hex key, supplied with the

RA-20R rotary atomizer, through the back of the

cup and into the distributor (3).  Turn the hex key

counterclockwise (as viewed from the back of the

cup) to unscrew the distributor from the cup.

To reassemble the cup and install it on the turbine,

perform the preceding steps in reverse.  Note that the

distributor has left-hand (reverse) threads.

3

4

2

1

5

6

Figure  1 Cup assembly and nozzle replacement

1. Charge ring
2. Ball driver
3. Distributor

4. Cup
5. Nozzle
6. O-ring

Maintenance 

To keep your system operating at peak efficiency, set

up a scheduled maintenance program.  Keep the

spray area clean and orderly at all times.

Daily

S

Clean the cup and distributor.

S

Flush the system.

S

Wipe any overspray off the atomizer.

S

Make sure the compressed air supply is free of oil
and water.

S

Drain the air filters and check the filter elements.

Replace the elements if the pressure drop across

the filters exceeds 0.3–1 bar (5–15 psi), or if they

become contaminated by oil.

Summary of Contents for RA-20R

Page 1: ...operator or other nearby personnel WARNING People and equipment in the vicinity of high voltage electrostatic systems can accumulate a dangerous static charge unless they are grounded WARNING Shut off...

Page 2: ...at the desired speed 7 Turn on vector air and adjust the vector air pressure to obtain the desired spray pattern 8 Turn on the electrostatic voltage and start production Modifying the Spray Pattern T...

Page 3: ...key ball driver 2 supplied with the RA 20R rotary atomizer through the hole and duckbill seal in the side of the charge ring 1 2 Rotate the cup 4 and push on the driver until it drops into the hole i...

Page 4: ...7 bar 5 100 psi Flow rate maximum 1500 cc min at 7 bar 50 oz min at 100 psi 130 centipoise material at 7 bar 100 psi 0 080 orifice 270 cc min NOTE 130 centipoise is approximately S 53 seconds on Zahn...

Page 5: ...slowly or oscillates Turbine or bearing air pressure low Leaking O ring in transition plate Turbine air regulators not set properly Turbine air bearings worn or plugged Cup out of balance or damaged C...

Page 6: ...tributor cup assembly for use with emulsions Replaces distributor cup assembly part 295369 Premium Finish Cup The premium finish cup retainer and nozzle must be used together Part Description Quantity...

Page 7: ...7 Fluid Tubes Part Description Quantity Note 181 761 Tube fluid 0 160 in dia orifice 1 168 671 Tube fluid 0 100 in dia orifice 1...

Page 8: ...8 Issued 2 11 Original copyright date 1997 Nordson and the Nordson logo are registered trademarks of Nordson corporation Viton is a registered trademark of E I DuPont de Nemours Co...

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