Graco PD44 Guide

3A7284B

Operation - Parts

PD44 Metering Valve

for High Wear Material

Meter, mix, and dispense valve for precise, two-component micro-dispensing of high wear

material. For professional use only.

Part No. UA0421

See page 3for model information, including maximum

working pressures.

Important Safety Instructions

Read all warnings and instructions in this

manual and in all related manuals before

using the equipment. Save all

instructions.

2 3A7284B

Contents

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Model Information . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Important Iscocyanate (ISO) Information . . . . . . . . 7

Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 7

Keep Components A and B Separate . . . . . . . . . 7

Moisture Sensitivity of Isocyanates . . . . . . . . . . . 7

Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 8

A (Red) and B (Blue) Components . . . . . . . . . . . 8

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Component Identification . . . . . . . . . . . . . . . . . . . 10

Motor Driven PD44 Metering Valve . . . . . . . . . . 10

Typical System Configuration . . . . . . . . . . . . . . 11

Typical Feed System Components . . . . . . . . . . 12

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Typical Installation . . . . . . . . . . . . . . . . . . . . . . . 13

PD44 Metering Valve Mounting Diagram. . . . . . 14

Motor Mounting Diagram . . . . . . . . . . . . . . . . . . 14

Custom Drive Mounting Diagram. . . . . . . . . . . . 15

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Ratio Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Sequence of Operation . . . . . . . . . . . . . . . . . . . 18

Pressure Relief Procedure . . . . . . . . . . . . . . . . . . . 19

Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Rebuild. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Wetted Section Disassembly . . . . . . . . . . . . . . . 22

Spool Valve Rebuild . . . . . . . . . . . . . . . . . . . . . . 24

Wetted Section Rebuild . . . . . . . . . . . . . . . . . . . 25

Wetted Section Reassembly . . . . . . . . . . . . . . . 27

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Stepper Motor Drive Body . . . . . . . . . . . . . . . . . 30

Metering Rod and Spool Valve. . . . . . . . . . . . . . 32

High Viscosity Spool Valve. . . . . . . . . . . . . . . . . 33

Spool Air Piston Assembly . . . . . . . . . . . . . . . . . 34

Material Inlet Blocks . . . . . . . . . . . . . . . . . . . . . . 35

Standard Nose with 7/8-9 Thread. . . . . . . . . . . . 36

Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Electrical Requirements . . . . . . . . . . . . . . . . . . . . . 39

Technical Specifications . . . . . . . . . . . . . . . . . . . . 40

California Proposition 65 . . . . . . . . . . . . . . . . . . . . 41

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 42

Related Manuals

3A7284B 3

Related Manuals

Manuals are available at www.graco.com

Component manuals are in U.S. English.

Model Information

* The UA0421 model of the PD44 metering valve does not include a motor. You will need to supply a motor to

operate the valve.

Part Description

308116 Severe-Duty, UHMWPE/PTFE or PTFE

Packed Stainless Steel Pumps

308167 Low Volume Air Regulators

308168 High Volume Air Regulators

308169 Air Filters, Lubricators and Kits

313526 Check-Mate®Pump Packages

PD44 Metering

Valve Model

Maximum Outlet Fluid

Working Pressure

psi (MPa, bar)

Maximum Air

Working Pressure

psi (MPa, bar)

Maximum Inlet Working Pressure

psi (MPa, bar)

Metal Sleeves Plastic Sleeves

UA0421

Motor Driven* 2000 (14, 138) 100 (07, 7) 1200 (8, 83) 400 (2.8, 28)

Warnings

4 3A7284B

Warnings

The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The

exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks.

When these symbols appear in the body of this manual or on warning labels, refer back to these Warnings.

Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this

manual where applicable.

WARNING

SKIN INJECTION HAZARD

High-pressure fluid from dispensing device, hose leaks, or ruptured components will pierce skin. This

may look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical

treatment.

• Do not point dispensing device at anyone or at any part of the body.

• Do not put your hand over the fluid outlet.

• Do not stop or deflect leaks with your hand, body, glove, or rag.

• Follow the Pressure Relief Procedure when you stop dispensing and before cleaning, checking, or

servicing equipment.

• Tighten all fluid connections before operating the equipment.

• Check hoses and couplings daily. Replace worn or damaged parts immediately.

TOXIC FLUID OR FUMES HAZARD

Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled or

swallowed.

• Read Safety Data Sheets (SDSs) for handling instructions and to know the specific hazards of the

fluids you are using, including the effects of long-term exposure.

• When spraying, servicing equipment, or when in the work area, always keep work area well-ventilated

and always wear appropriate personal protective equipment. See Personal Protective Equipment

warnings in this manual.

• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.

PERSONAL PROTECTIVE EQUIPMENT

Always wear appropriate personal protective equipment and cover all skin when spraying, servicing

equipment, or when in the work area. Protective equipment helps prevent serious injury, including

long-term exposure; inhalation of toxic fumes, mists or vapors; allergic reaction; burns; eye injury and

hearing loss. This protective equipment includes but is not limited to:

• A properly fitting respirator, which may include a supplied-air respirator, chemically impermeable

gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local

regulatory authority.

• Protective eyewear and hearing protection.

Warnings

3A7284B 5

WARNING

FIRE AND EXPLOSION HAZARD

Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. Paint or solvent

flowing through the equipment can cause static sparking. To help prevent fire and explosion:

• Use equipment only in well-ventilated area.

• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop

cloths (potential static sparking).

• Ground all equipment in the work area. See Grounding instructions.

• Never spray or flush solvent at high pressure.

• Keep work area free of debris, including solvent, rags and gasoline.

• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes

are present.

• Use only grounded hoses.

• Hold dispensing device firmly to side of grounded pail when triggering into pail. Do not use pail liners

unless they are anti-static or conductive.

•Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment until

you identify and correct the problem.

• Keep a working fire extinguisher in the work area.

EQUIPMENT MISUSE HAZARD

Misuse can cause death or serious injury.

• Do not operate the unit when fatigued or under the influence of drugs or alcohol.

• Do not exceed the maximum working pressure or temperature rating of the lowest rated system

component. See Technical Specifications in all equipment manuals.

• Use fluids and solvents that are compatible with equipment wetted parts. See Technical

Specifications in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For

complete information about your material, request Safety Data Sheets (SDSs) from distributor or

retailer.

• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.

• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine

manufacturer’s replacement parts only.

• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create

safety hazards.

• Make sure all equipment is rated and approved for the environment in which you are using it.

• Use equipment only for its intended purpose. Call your distributor for information.

• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.

• Do not kink or over bend hoses or use hoses to pull equipment.

• Keep children and animals away from work area.

• Comply with all applicable safety regulations.

Warnings

6 3A7284B

WARNING

MOVING PARTS HAZARD

Moving parts can pinch, cut or amputate fingers and other body parts.

• Keep clear of moving parts.

• Do not operate equipment with protective guards or covers removed.

• Equipment can start without warning. Before checking, moving, or servicing equipment, follow the

Pressure Relief Procedure and disconnect all power sources.

PLASTIC PARTS CLEANING SOLVENT HAZARD

Many cleaning solvents can degrade plastic parts and cause them to fail, which could cause serious

injury or property damage.

• Use only compatible solvents to clean plastic structural or pressure-containing parts.

• See Technical Specifications in all equipment manuals for materials of construction. Consult the

solvent manufacturer for information and recommendations about compatibility.

Important Iscocyanate (ISO) Information

3A7284B 7

Important Iscocyanate (ISO) Information

Isocyanate Conditions Keep Components A and B

Separate

Moisture Sensitivity of

Isocyanates

Exposure to moisture (such as humidity) will cause ISO

to partially cure, forming small, hard, abrasive crystal

that become suspended in the fluid. Eventually a film will

form on the surface and the ISO will begin to gel,

increasing in viscosity.

NOTE: The amount of film formation and rate of

crystallization varies depending on the blend of ISO, the

humidity, and the temperature.

Spraying or dispensing fluids that contain isocyanates

creates potentially harmful mists, vapors, and

atomized particulates.

• Read and understand the fluid manufacturer’s

warnings and Safety Data Sheets (SDSs) to know

specific hazards and precautions related to

isocyanates.

• Use of isocyanates involves potentially hazardous

procedures. Do not spray with this equipment

unless you are trained, qualified, and have read

and understood the information in this manual and

in the fluid manufacturer’s application instructions

and SDSs.

• Use of incorrectly maintained or mis-adjusted

equipment may result in improperly cured

material. Equipment must be carefully maintained

and adjusted according to instructions in the

manual.

• To prevent inhalation of isocyanate mists, vapors,

and atomized particulates, everyone in the work

area must wear appropriate respiratory protection.

Always wear a properly fitting respirator, which

may include a supplied-air respirator. Ventilate the

work area according to instructions in the fluid

manufacturer’s SDSs.

• Avoid all skin contact with isocyanates. Everyone

in the work area must wear chemically

impermeable gloves, protective clothing and foot

coverings as recommended by the fluid

manufacturer and local regulatory authority. Follow

all fluid manufacturer recommendations, including

those regarding handling of contaminated

clothing. After spraying, wash hands and face

before eating or drinking.

Cross-contamination can result in cured material in

fluid lines which could cause serious injury or damage

equipment. To prevent cross-contamination:

• Never interchange component A and component B

wetted parts.

• Never use solvent on one side if it has been

contaminated from the other side.

NOTICE

Partially cured ISO will reduce performance and the life

of all wetted parts.

• Always use a sealed container with a desiccant

dryer in the vent, or a nitrogen atmosphere. Never

store ISO in an open container.

• Keep the ISO pump wet cup or reservoir (if

installed) filled with appropriate lubricant. The

lubricant creates a barrier between the ISO and the

atmosphere.

• Use only moisture-proof hoses compatible with

ISO.

• Never use reclaimed solvents, which may contain

moisture. Always keep solvent containers closed

when not in use.

• Always lubricate threaded parts with an

appropriate lubricant when reassembling.

Important Iscocyanate (ISO) Information

8 3A7284B

Changing Materials

A (Red) and B (Blue)

Components

NOTE: Material suppliers can vary in how they refer to

plural component materials.

Be aware that when standing in front of the manifold on

proportioner:

• Component A (Red) is on the left side.

• Component B (Blue) is on the right side.

For all machines:

• The A (Red) side is intended for ISO, hardeners,

and catalysts.

• If one of the materials being used is moisture-

sensitive, that material should always be in the A

(Red) side.

• The B (Blue) side is intended for polyols, resins, and

bases.

NOTE: For machines with material volume ratios other

than 1:1, the higher volume side is typically at the B

(Blue) side.

NOTICE

Changing the material types used in your equipment

requires special attention to avoid equipment damage

and downtime.

• When changing materials, flush the equipment

multiple times to ensure it is thoroughly clean.

• Always clean the fluid inlet strainers after flushing.

• Check with your material manufacturer for

chemical compatibility.

• When changing between epoxies and urethanes

or polyureas, disassemble and clean all fluid

components and change hoses. Epoxies often

have amines on the B (hardener) side. Polyureas

often have amines on the B (resin) side.

Overview

3A7284B 9

Overview

This plural component meter, mix, and dispense device

accurately meters liquid and semi-paste materials.

The machine is ideal for a two-component application

requiring very small and precisely mixed shots.

The ratio of the pneumatic cylinder area to pump shaft

area provides the adjustable pressure intensification

needed to move the separate liquids through the mixer

with a flow rate suitable for production requirements.

The complete system is enclosed. Mixing of the two

materials takes place only in the mixer at the final stage

of metering valve operation. See Sequence of

Operation on page 18.

Grounding

Metering valve: attach the ground wire from the

grounding lug (C) to a true earth ground. See Motor

Driven PD44 Metering Valve on page 10.

Fluid hoses: use only electrically conductive hoses with

a maximum of 500 ft. (150 m) combined hose length to

ensure grounding continuity. Check electrical resistance

of hoses. If total resistance to ground exceeds 29

megohms, replace hose immediately.

Fluid supply container: follow local code.

Feed System components: attach ground wire from

grounding lug to true earth ground. See the pump

manual for grounding points. See Related Manuals on

page 3.

Solvent pails used when flushing: follow local code.

Use only conductive metal pails, placed on a grounded

surface. Do not place the pail on a nonconductive

surface, such as paper or cardboard, which interrupts

grounding continuity.

To maintain grounding continuity when flushing or

relieving pressure: hold metal part of the dispense

valve firmly to the side of a grounded metal pail, then

trigger the gun/valve.

The equipment must be grounded to reduce the risk

of static sparking. Static sparking can cause fumes to

ignite or explode. Grounding provides an escape wire

for the electric current.

Component Identification

10 3A7284B

Component Identification

Motor Driven PD44 Metering Valve

FIG. 1: PD44 Metering Valve Component Identification

Key:

A A Material Inlet (1/4 NPT)

B B Material Inlet (1/4 NPT)

C Grounding Lug

D Spool Assemblies

E Metering Rods

F Retaining Block

J Dispense Air Inlet

K Reload Air Inlet

L Outlet Nose

M Over-travel Proximity Switch

N Home Proximity Switch

P Spool Valve Proximity Switch

R Motor (not included)

S Main Air Inlet/Control

Solenoid (on far side of valve

as shown)

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