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Operation
309475F 13
Operation
Flush Before First Use
Your pressure regulator has been tested in the factory
with an anti-corrosion liquid. Before using the regulator,
thoroughly flush the system with a solvent to remove
residue of this liquid as well as any contaminants that
have been introduced during assembly of the system.
Pressure Relief Procedure
1. Lock the gun trigger safety.
2. Close the bleed-type master air valve (required in
your system).
3. Unlock the gun trigger safety.
4. Hold a metal part of the gun firmly to the side of a
grounded metal pail and trigger the gun to relieve
pressure.
5. Lock the gun trigger safety.
6. Open the drain valve (required on your system), with
a container ready to catch the drainage.
7. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is completely
clogged or that pressure has not been fully relieved after
performing steps 1 through 7, very slowly loosen the tip
guard retaining nut or hose end coupling and relieve
pressure gradually. Then loosen completely and clear
the tip or hose.
Adjusting the Regulator
The fluid pressure regulator controls pressure down-
stream from its outlet. The inlet fluid pressure should
always be higher than the outlet fluid pressure.
If you are using an accessory fluid pressure gauge, trig-
ger the spray gun to relieve pressure in the line when
reducing the pressure, to ensure a correct gauge read-
ing.
Adjust the pump air pressure and the fluid pressure reg-
ulator for the best spraying combination.
In a circulating system, the back pressure valve controls
the fluid pressure upstream of its inlet in the same way.
Mechanical Regulator
1. Back out the knob until there is no spring pressure.
2. Turn on the fluid supply, to admit fluid to the regula-
tor.
3. Turn the knob clockwise to adjust fluid pressure to
the desired level.
Pneumatic Regulator
1. With the fluid supply shut off, turn on the air pres-
sure to the regulator.
2. Turn on the fluid supply, to admit fluid to the regula-
tor.
3. Increase the fluid inlet pressure. When the fluid out-
let pressure is at the desired level, shut off the air to
the fluid regulator.
WARNING
The system pressure must be manually relieved to
prevent the system from starting or spraying acciden-
tally. To reduce the risk of an injury from accidental
spray from the gun, splashing fluid, or moving parts,
follow the Pressure Relief Procedure whenever you:
• are instructed to relieve the pressure
• stop spraying
• check or service any of the system equipment
• or install or clean the spray tip.