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How The Gun Works
The trigger actuates a small valve in the gun handle
that controls the flow of air into the piston assembly.
When the trigger is pulled, air flows through the valve to
the front of the piston. Air pressure forces the piston
towards the rear of the gun, simultaneously closing off the
purge air and moving the mixing chamber to a position
where the mixing chamber orifices are aligned with the
orifices in both, the side block seal and check valve assem-
blies.
The proper alignment of the orifices is determined by
the setting of the adjustment nut, located on the pis-
ton lock assembly.. This adjustment nut determines
the length of travel of the air piston and has been
preset at the factory and should not require adjust-
ment. (SEE MAINTENANCE SECTION)
The two fluids (isocyanate and polyol) then flow through
the material shut-off valves, seal, and check valve assem-
blies and into the mixing chamber. The two fluids impinge
against one another and exit the mixing chamber in a swirl-
ing, conical spray pattern.
When the trigger is released, the mixing chamber returns
to its original position and purge air flows into the mixing
chamber housing. The front tip o-ring keeps
inside the gun head, which forces all of the air through the
orifices in the mixing chamber creating a complete, total
and constant purge.
This purge air continues to flow through the mixing cham-
ber until the air valve has shut-off all air to the gun; or until
the trigger is pulled again.
Section 1 - Installation: Equipment Assembly
air purge
Piston Lock
Engage piston lock whenever you stop spraying, to avoid
accidental triggering.
Always use piston lock in conjunction with fluid ball valves
to avoid accidental triggering.
WARNING
Read warnings, page 3.
To engage Piston lock: push knob in and turn clockwise.
If engaged, gun will not actuate.
To disengage piston lock: push knob in and turn coun-
terclockwise until it pops out. There will be a gap between
knob and gun body.
See page 19 for piston lock adjustment or installation.
Loss of Air Pressure
In event of loss of air pressure, gun will continue to spray.
To shut off gun, do one of the following:
•
Push in piston lock, see Engage piston lock.
•
Close ball valves A and B.
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