Operation - Graco A Series Instructions Manual

CAUTION
D The new system must be cleaned and tested
thoroughly before admitting fluid to the regulator
to avoid contaminants clogging or damaging the
regulator.
D Always use the lowest possible air and fluid
pressures for your application. High pressures
can cause premature spray tip, regulator, and
pump wear.
NOTE: Reference numbers and letters in parentheses
in the text refer to Figs.1 through 5 and the Parts
Drawings.
Regulating Fluid Pressure
Spring Operated Regulators
1. Close the regulator: turn the adjustment handle (1) 1. Close the regulator: turn the adjustment handle (1)
counterclockwise to relieve the spring tension. See counterclockwise to relieve the spring tension. See
Fig. 3.
2. Start the pump and open the fluid regulator's inlet 2. Start the pump and open the fluid regulator's inlet 2. Start the pump and open the fluid regulator's inlet 2. Start the pump and open the fluid regulator's inlet
ball valve (B) to admit fluid to the regulator. See ball valve (B) to admit fluid to the regulator. See ball valve (B) to admit fluid to the regulator. See ball valve (B) to admit fluid to the regulator. See
Fig. 1.
3. Turn the adjustment handle (1) 3. Turn the adjustment handle (1) 3. Turn the adjustment handle (1) clockwise to
increase fluid pressure. See Fig. 3. Adjust for the increase fluid pressure. See Fig. 3. Adjust for the increase fluid pressure. See Fig. 3. Adjust for the increase fluid pressure. See Fig. 3. Adjust for the
desired spray pattern. Before reducing the
regulator pressure, partially relieve pressure in the regulator pressure, partially relieve pressure in the
gun hose to ensure the correct gauge reading. gun hose to ensure the correct gauge reading.
Tighten the jam nut (3) to the regulator cap (5) to Tighten the jam nut (3) to the regulator cap (5) to
ensure the proper pressure setting.
Fig. 3
6 308325

Operation

clockwise to
Before reducing the
5
3
1
02729
Air Operated Regulators
1. Start the pump and open the fluid regulator's inlet ball
valve (B) to admit fluid to the regulator. See Fig. 2.
2. Increase the air pressure to obtain the desired fluid
pressure. Before reducing the regulator pressure,
partially relieve pressure in the gun hose to ensure
the correct gauge reading.
NOTE: Make sure the air bleed hole (J) in the air line
fitting (2) is not plugged. Refer to Fig. 4. For the best
results, use an air regulator with at least a two inch
diameter diaphragm to control this fluid regulator.
Flushing Procedure Flushing Procedure
1. Flush the regulator with a compatible solvent 1. Flush the regulator with a compatible solvent
whenever the rest of the system is flushed. whenever the rest of the system is flushed.
2. Remove the gauge if the fluid pressure will exceed 2. Remove the gauge if the fluid pressure will exceed
the gauge range. the gauge range.
3. Spring Operated Regulators Only 3. Spring Operated Regulators Only
a. Shut off the pump and relieve fluid pressure in a. Shut off the pump and relieve fluid pressure in a. Shut off the pump and relieve fluid pressure in
the system by opening the back pressure the system by opening the back pressure the system by opening the back pressure
valve (E) or other bypass valve. See Fig. 1. valve (E) or other bypass valve. See Fig. 1. valve (E) or other bypass valve. See Fig. 1.
b. Turn the adjustment handle (1) clockwise to b. Turn the adjustment handle (1) clockwise to b. Turn the adjustment handle (1) clockwise to b. Turn the adjustment handle (1) clockwise to
open the regulator valve to the desired flushing open the regulator valve to the desired flushing open the regulator valve to the desired flushing open the regulator valve to the desired flushing
outlet pressure and flow. See Fig. 3. outlet pressure and flow. See Fig. 3. outlet pressure and flow. See Fig. 3. outlet pressure and flow. See Fig. 3. outlet pressure and flow. See Fig. 3.
4. Air Operated Regulator Only 4. Air Operated Regulator Only Air Operated Regulator Only Air Operated Regulator Only
a. Increase the air pressure to obtain desired a. Increase the air pressure to obtain desired a. Increase the air pressure to obtain desired a. Increase the air pressure to obtain desired
fluid flushing pressure. fluid flushing pressure. fluid flushing pressure.
b. Make sure the air bleed hole (J) in the air line b. Make sure the air bleed hole (J) in the air line b. Make sure the air bleed hole (J) in the air line b. Make sure the air bleed hole (J) in the air line
fitting (2) is not plugged. Refer to Fig. 4. fitting (2) is not plugged. Refer to Fig. 4. fitting (2) is not plugged. Refer to Fig. 4.
5. Flush until thoroughly clean. Always use the lowest 5. Flush until thoroughly clean. Always use the lowest
possible pressure when flushing.
6. Spring Operated Regulators Only
After flushing, turn the adjustment handle (1)
counterclockwise to the previous pressure setting.
Partially relieve pressure in the gun hose to ensure
the correct gauge reading.