Static mixing head for resin
GRACO
The patented Graco PD44 Valve features balanced inlet/outlet spool assemblies that do not displace
material while shifting from the reload to the dispense position. This allows pressure feeding of the
"A" and "B" components up to 1200 psi during reloading while isolating the materials from the mixer
inlet. Upon shifting to the dispense position, an accurate volume of "A" and "B" components
is injected into the disposable mixer inlet by rod displacement metering technology
Reload
Spools shift to the right
- Material feed inlets are opened
- Materials are transferred into the metering chambers
by a pressurized feed system
- Outlet ports are blocked
- Metering rods are retracted to a precise position determining
the volume of each material
Shift
The balanced spool assemblies shift to the dispense position
- Material path to the mixer inlet is opened
- Material feed inlet ports are blocked
- Metering rods remain in the retracted position
Dispense
Metering rods drive down
- A and B materials are simultaneously dispensed from the metering
chamber into the disposable mixer
- A and B materials are dispensed at the predetermined volume ratio.
Upon completion of the dispense stroke, the metering rod
and spool assemblies shift back to the reload position
