
33
OPERA
TION
Flushing Operations
Set all of the valves and levers to their proper posi-
tions for flushing.
Turn the “Rotary Actuator” to the “Load/Suckback”
position.
Ensure that the suction valve is closed.
Open the self-flushing valve and run the pump at
approximately 100 GPM.
After 2 minutes, close the self flush valve.
Normally the suckback procedure will remove suf-
ficient material from the circulating system to negate
the need for draining the circulating system and spray
bar before proceeding with the wash out operation. The
flushing operation requires only 3 quarts of flushing
solvent. This small amount is not sufficient to fill the
lines to the tank, thus preventing solvent from being
forced into the tank.
A common practice following completion of the
flushing procedure and subsequent shutdown is to pour
1 to 2 quarts of solvent into the fill line. This softens or
dissolves the residual asphalt in the pump. Allow these
solvents to remain in the system until the next use.
If unit has electric washdown option, open flush
valve and turn on electric pump for 2 minutes. This
will pump 2 quarts of diesel fuel on top of the asphalt
pump.
Figure 14. Valve Positions for Flushing
Suck
Back
Off
Hand
Spray
Hand Spray Valve Positions
Right
Suck Back
Valve
Closed
4 Way Valve
Load/Suckback
Suction Valve
Closed
Left
Suck Back
Valve
Closed
Handspray
Valve
Off
Flush Valve
Open
Suckback
Control Cylinder
Closed
Transfer Valve
Closed
Hand Spray
Valve
Closed
Transfer Line
Suck Back
Valve
Closed
Return Valve
Open
Some units may
have a butterfly
valve in place of
the return valve.
The butterfly valve
should be Open