22
PI-121
January 2020
5.9 With no nozzles installed in the gun or the Multi-Mode Valve, have
the gun operator squeeze both triggers to shuttle the Multi-Mode Valve
cartridge and direct flow to the gun. Verify that all flow now exits the
system through the gun. Also, check the air pressure gage on the Multi-
Mode Valve and adjust, if necessary, so that the air pressure through the
valve assembly is between 80 psi and 90 psi while the control gun is
engaged. Also, check the drip sight located on top of the air lubricator to
verify that the oil drip rate is at least one drop every two seconds. Adjust
drip rate if necessary. Gun operator should keep the gun engaged for at
least one full minute to purge any debris that may be in the water lines.
5.10 Disengage pump and shut down waterblast unit. Turn off water
supply.
5.11 NOZZLE INSTALLATION
Follow instructions for specific mode of operation:
CONSTANT PRESSURE MODE
• Install nozzles in control gun and Multi-Mode Valve.
• Verify that fixed orifice located in Multi-Mode Valve has an equiva-
lent flow to the total flow of the gun nozzles. Consult flow charts for
specific manufacturer’s nozzles.
• Install diffuser and diffuser housing over Mode Configuration Port and
tighten securely.
DUMP MODE:
• Install nozzles in control gun.
• Unscrew diffuser housing, install nozzle in mode configuration port,
and reinstall diffuser housing.
SHUT-IN (DRY SHUTOFF) MODE:
• Install nozzles in control gun.
• Install plug in mode configuration port.
5.12 Once gun operator(s) have established control of their gun(s) and
taken positions for waterblasting operations to begin, start unit and en-
gage waterblast pump per unit startup procedures.