Graco PD44 ® Patented Meter, Mix and Dispense Valve for Two-Component Micro Dispensing
Graco PD44 Valve for Precise Micro-Dispensing To determine dot volume: Volume = D3 x 0.5236* 2 1.0cc Dot Sizes * 1/2 the volume of a sphere Bead Sizes 0.50cc 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.
System How It Works Configuration 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.
1 Graco PD44 Valve Patented PD44 Metering Valves Metering Drives Meter, mix and dispense shots from 0.005 to 5 cc’s and handle material ratios from 1:1 to 25:1. Manual control of shot size Pneumatically-driven valves have a micrometer adjustment to easily set the desired shot size. Metering Drive Programmable shot size Machined Seals A longer life seal means less down time and reduces maintenance costs Linear actuator provides shot size control. Useful feature when different shot sizes are required.
2 Controller Pneumatic/Linear Actuator Controller Electric Controller Manual and Programmable Shot Size Programmable Flow and Shot Size Sensors in the valve monitor the position of the spool assemblies and metering rods. These sensors interface with the control panel to assure proper valve operation. This free standing table top controller includes a NEMA 23 stepper motor for precise flow and shot control.
3 Feed System Cartridge Feed Systems Transfer Pumps and Rams Reservoir Tanks Transfer low to medium viscosity materials to the PD44 valve by placing cartridges of various sizes into pressurized containers. Pump low to high viscosity materials directly from bulk containers. Use pail and drum rams, transfer pumps and feed hoses as required. Transfer low to medium viscosity materials to the PD44 valve using various sized reservoir tanks.
Technical Specifications “A” and “B” Metering Rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A wide selection of standard size metering rods are available depending on the ratio and shot sizes desired. Custom sized metering rods can be machined to accommodate most material ratios. The standard construction of the main body is 303/304 stainless steel. The standard construction of the metering assembly is a nitrided tool steel rod and a nitrided tool steel tube.
ABOUT GRACO Founded in 1926, Graco is a world leader in fluid handling systems and components. Graco products move, measure, control, dispense and apply a wide range of fluids and viscous materials used in vehicle lubrication, commercial and industrial settings. The company’s success is based on its unwavering commitment to technical excellence, world-class manufacturing and unparalleled customer service.
