Graco PD44 User Manual
Graco® PD44
Patented Meter, Mix and Dispense Valve
for Two-Component Micro Dispensing
Graco PD44 Valve for Precise Micro-Dispensing
1.0cc
0.50cc
0.25cc
0.1cc
0.005cc
1/16" Dia.
1/8" Dia.
3/16" Dia.
1/4" Dia.
To determine dot volume:
Volume = D
2
* ½ the volume of a sphere
3
x 0.5236*
Exceptional Performance
The Graco PD44 Valve is specifically designed to dispense small
amounts of water thin to paste viscosity materials from 0.005
cc’s to 5 cc’s. The metering rods are matched with machined
seals for improved seal life. There are no material hoses between
the rod pump outlets and mixer inlet which eliminates potential
ratio or shot size problems (phasing) due to hose expansion
and contraction.
Graco PD44 Valve features
• Specically designed to accurately dispense shots
of two-component epoxies, urethanes, silicone and
most reactive resin systems
• Improved low viscosity spool design
• Rod positive displacement metering
• Precise mix ratio and shot repeatability
• Eliminates cleaning and potential hardening
of materials in the valve
D
Bead Sizes Dot Sizes
Bead Size = Full diameter of bead
Key Applications
Potting
Gasketing
Sealing
Encapsulation
Syringe Filling
Key Industries
Automotive Electronics
Consumer Electronics
Medical
Sporting Goods
Automotive Components
(ex: lighting)
Appliance
Product Assembly
System Configuration
How It Works
Materials remain separate until injected into static mixer.
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
RELOAD
SHIFT
DISPENSE
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