system, connect a return line from the 1/4" PT circulating port to the back pressure valve.
4. SYSTEM ACCESSORIES
Two accessories are required in your system: a bleed type master air valve and a fluid drain
valve. These accessories help reduce the risk of serious bodily injury including fluid injection,
splashing in the eyes or on the skin, and injury from moving parts if you are adjusting or
repairing the pump.
The bleed type master air valve is required only with air powered pumps. It relieves air trapped
between this valve and the pump after the air regulator is shut off. Trapped air can cause the
pump to cycle unexpectedly. Locate the valve close to the pump.
The fluid drain valve assists in relieving fluid pressure in the displacement pump, hose and
gun.
5. FLUSH THE SYSTEM
Before flushing, always follow the pressure relief procedure and remove the spray tip. Start the
pump and flush the system with a compatible solvent. Check the system under pressure for
leaks; if any are found, follow the pressure relief procedure and repair the leaks. Pressurize the
system again and make sure the leaking has stopped.
6. CHANGING THE SPRAY TIP
Before adjusting the spray pattern or replacing the tip, follow the pressure relief procedure and
close all air valves. Unscrew the tip retainer and install the tip, then tighten the retainer. Be
sure the gasket is installed between the tip and valve seat to prevent leaking. If you are using a
tip filter accessory kit, remove the tip retainer and gasket and install the kit with your tip.
7. GROUNDING
Proper grounding is essential to maintaining a safe system.
