Graco 24R021 Stücklistenhandbuch

332198C

Instructions - Parts

2K Manual

Dispense Valve

For use with two component proportioners to mix and dispense beads of non-abrasive

material. For professional use only.

Not approved for use in European explosive atmosphere locations.

Model 24R021

2000 psi (14 MPa, 137 bar) Maximum Fluid Working Pressure

Important Safety Instructions

Read all warnings and instructions in this manual

and the system manual. Save all instructions.

ti20167a

Related Manuals

2332198C

Contents

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Important Isocyanate (ISO) Information . . . . . . . . 5

Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 5

Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . 5

Keep Components A (ISO) and B (RES) Separate 5

Moisture Sensitivity of Isocyanates . . . . . . . . . . . 5

Foam Resins with 245 fa Blowing Agents . . . . . . 5

Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Prime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Pressure Balance the Gun . . . . . . . . . . . . . . . . . 8

Ratio Checking . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Install Disposable Static Mixer . . . . . . . . . . . . . . 9

Dispense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Pressure Relief Procedure . . . . . . . . . . . . . . . . 10

Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 10

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Install Restrictors or Plugs . . . . . . . . . . . . . . . . 11

Volume Balancing . . . . . . . . . . . . . . . . . . . . . . . 11

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Routine Cleaning . . . . . . . . . . . . . . . . . . . . . . . 11

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Typical Restrictor Pressure Drop . . . . . . . . . . . 15

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 16

Related Manuals

The following manuals are available at www.graco.com.

Part Description

3A1602 E-8p Proportioner Operation and Repair

Warnings

332198C 3

Warnings

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

tion 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

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 MSDSs to know the specific hazards of the fluids you are using.

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

• Always wear chemically impermeable gloves when spraying, dispensing, or cleaning equipment.

PERSONAL PROTECTIVE EQUIPMENT

Wear appropriate protective equipment when in the work area to help prevent serious injury, including

eye injury, hearing loss, inhalation of toxic fumes, and burns. This protective equipment includes but is

not limited to:

• Protective eyewear, and hearing protection.

• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer

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.

FIRE AND EXPLOSION HAZARD

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

• 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.

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

• Use only grounded hoses.

• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they

are antistatic 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.

Warnings

4332198C

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 Data in all equipment manuals.

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

equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information

about your material, request MSDS from distributor or retailer.

• Do not leave the work area while equipment is energized or under pressure.

• 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 manu-

facturer’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.

PRESSURIZED ALUMINUM PARTS HAZARD

Use of fluids that are incompatible with aluminum in pressurized equipment can cause serious chemical

reaction and equipment rupture. Failure to follow this warning can result in death, serious injury, or prop-

erty damage.

• Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or flu-

ids containing such solvents.

• Many other fluids may contain chemicals that can react with aluminum. Contact your material sup-

plier for compatibility.

WARNING

Important Isocyanate (ISO) Information

332198C 5

Important Isocyanate (ISO) Information

Isocyanates (ISO) are catalysts used in two component materials.

Isocyanate Conditions

Material Self-ignition

Keep Components A (ISO) and

B (RES) Separate

Moisture Sensitivity of

Isocyanates

Exposure to moisture (such as humidity) will cause ISO

to partially cure; forming small, hard, abrasive crystals,

which 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 crystal-

lization varies depending on the blend of ISO, the

humidity, and the temperature.

Foam Resins with 245 fa

Blowing Agents

Some foam blowing agents will froth at temperatures

above 90°F (33°C) when not under pressure, especially

if agitated. To reduce frothing, minimize preheating in a

circulation system.

Spraying or dispensing materials containing isocya-

nates creates potentially harmful mists, vapors, and

atomized particulates.

Read material manufacturer’s warnings and material

MSDS to know specific hazards and precautions

related to isocyanates.

Prevent inhalation of isocyanate mists, vapors, and

atomized particulates by providing sufficient ventila-

tion in the work area. If sufficient ventilation is not

available, a supplied-air respirator is required for

everyone in the work area.

To prevent contact with isocyanates, appropriate per-

sonal protective equipment, including chemically

impermeable gloves, boots, aprons, and goggles, is

also required for everyone in the work area.

Some materials may become self-igniting if applied

too thick. Read material manufacturer’s warnings and

material MSDS.

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 (ISO) and com-

ponent B (RES) wetted parts.

• Never use solvent on one side if it has been con-

taminated 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 appropri-

ate lubricant when reassembling.

Important Isocyanate (ISO) Information

6332198C

Changing Materials

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 chemi-

cal compatibility.

• When changing between epoxies and urethanes

or polyureas, disassemble and clean all fluid com-

ponents and change hoses. Epoxies often have

amines on the B (hardener) side. Polyureas often

have amines on the B (resin) side

Installation

332198C 7

Installation

1. Relieve all system pressure before installing the dis-

pense valve.

2. Ground the gun through connection to a properly

grounded fluid hose and pump. See your system

manual for further information.

3. Thread the handle (K) onto the manifold (L).

4. Connect the gun fluid supply hoses to the A (ISO)

and B (RES) fluid inlets of gun.

NOTE: Hoses are color coded: red for component A

(ISO), blue for component B (RES). Red (ISO) usually is

connected to the left side of the valve (as viewed from

the back of the gun).

5. Perform Prime procedure, page 8.

GROUNDING

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.

FIG. 1

ti20166a

Key:

A A (Iso) Hose

B B (Resin) Hose

C OFF (Closed) Position

D ON (Open) Position

E Restrictor or Plug

F Outlet Manifold

G Static Mixer Nut (Static Mixer Not Shown)

HLever

J Inlet Ball Valves

K Handle

L Manifold

M Check Valves

Operation

8332198C

Operation

Prime

Perform this procedure whenever air is introduced into

the material lines, such as after connecting the material

supply lines to the dispense valve.

1. Perform Pressure Relief Procedure on page 10.

2. If a static mixer is installed, remove static mixer.

3. Use lever (H) to open the dispense valve inlet ball

valves (J).

4. If necessary, prime the proportioner. See propor-

tioner manual for priming instructions.

5. Run the proportioner until clean, air-free material

begins to exit the dispense valve.

6. If necessary, Pressure Balance the Gun.

7. Install Disposable Static Mixer.

Pressure Balance the Gun

Balancing the back pressure:

• controls ratio lead-lag when the gun opens

• holds pressure in the hose, providing a very smooth

flow

• minimizes oozing from mixer

• minimizes material crossover.

1. Use lever (H) to close the dispense valve inlet ball

valves (J).

2. Remove static mixer.

3. With the static mixer removed, dispense into a

waste container. Note pressure gauge readings. If

pressures are more than 25% apart, continue to

next step. If not, pressures are sufficiently balanced.

4. If pressures are more than 25% apart, replace one

or both plugs or restrictors with a different restrictor

size:

NOTE: An extra 0.032 in. restrictor is included with the

gun. If necessary, use this restrictor to balance the pres-

sures. Put the larger orifice on the side with the higher

viscosity material.

a. Perform Pressure Relief Procedure on

page 10.

b. Select the new restrictors required to achieve

desired back pressure and balance. See pres-

sure drop chart in FIG. 2 on page 15.

NOTE: The valve should be able to achieve the desired

flow rate at a pressure of 200-1500 psi (1.4-10 MPa,

14-103 bar). A (ISO) and B (RES) pressures should bal-

ance within 25% of each other.

c. Install Restrictors or Plugs, see page 11.

d. Repeat this procedure to verify pressures are

balanced.

NOTICE

Always open and close lever (H) fully and quickly.

Opening the valve partially or slowly will cause soft

spots in the material and may shut down the propor-

tioner because of a pressure imbalance.

NOTICE

Always open and close lever (H) fully and quickly.

Opening the valve partially or slowly will cause soft

spots in the material and may shut down the propor-

tioner because of a pressure imbalance.

Operation

332198C 9

Ratio Checking

NOTE: Use ratio check nozzle 255247 with retaining nut

512292. Purchase separately.

The output mix ratio of your proportioner can be

checked by dispensing the two fluids separately out of

the nosepiece into tared cups. The cups can then be

weighed and the weights divided to get the mix ratio by

weight.

Ratio checks provide information about the ratio of an

overall sample. Transient problems (soft spots) caused

by starting and stopping the flow (lead-lag) may not

show up in this kind of ratio check. Physical tests of the

mixed fluid are the best check of correct ratio and mix

quality.

Install Disposable Static Mixer

1. Perform Pressure Relief Procedure, page 10.

2. Use lever (H) to close the dispense valve inlet ball

valves (J).

3. Coat threads of outlet manifold (F) with grease to

prevent material curing on threads.

4. Install static mixer and secure with nut (G).

Dispense

1. If it is possible that air may be in the fluid lines, per-

form Prime procedure on page 8.

2. If the gun has not yet been pressure balanced, per-

form Pressure Balance the Gun procedure on

page 8.

3. If the fluid in the static mixer is cured or there is no

static mixer installed, Install Disposable Static

Mixer, page 9.

4. Start proportioner and adjust to desired pressure.

See proportioner manual for instructions.

NOTE: Use the lowest proportioner pressure setting that

produces the desired flow.

5. Use lever (H) to open and close dispense valve inlet

ball valves (J) as desired to dispense materials.

6. If stopping dispensing for longer than the cure time

of the materials:

a. Use lever (H) to close dispense valve inlet ball

valves (J) as desired to dispense materials.

b. Keep static mixer installed.

c. When ready to dispense again, Install Dispos-

able Static Mixer, page 9.

7. When done using the dispense valve for the day,

perform Daily Shutdown on page 10.

NOTICE

If the proportioner pressure setting is too high, any dif-

ferences in viscosity will cause a pressure differential

that will result in improper mixing.

NOTICE

Always open and close lever (H) fully and quickly.

Opening the valve partially or slowly will cause soft

spots in the material and may shut down the propor-

tioner because of a pressure imbalance.

Operation

10 332198C

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever

you see this symbol.

This procedure describes how to relieve pressure from

the dispense valve. See the supply system manual for

instructions on relieving pressure from the entire sys-

tem.

1. Shut off material supply pumps.

2. With the valve pointed into a grounded metal pail,

use the lever (H) to open the inlet ball valves (J) and

relieve the fluid pressure.

3. If the valve nozzle or fluid hose is clogged or if pres-

sure has not been fully relieved after following the

steps above:

a. Use lever (H) to close dispense valve inlet ball

valves (J).

b. VERY SLOWLY loosen the static mixer nut (G)

from the outlet manifold (F) or the hose end

coupling to relieve pressure gradually, then

loosen completely. Clear hose or nozzle

obstruction.

c. Use lever (H) to open dispense valve inlet ball

valves (J).

Daily Shutdown

NOTE: For brief shutdowns, leave the cured mixer in

place until it is time to use a fresh mixer.

When you finish using the 2K Manual Dispense Valve,

clean the outlet manifold (F) and protect it from drying or

crystallization as follows:

1. Perform Pressure Relief Procedure, page 10.

2. Remove and properly dispose of the static mixer.

3. Dispense one shot of material into a waste con-

tainer to clear any crossover in the outlet

manifold (F).

4. Wipe the nose with a clean rag, being careful not to

let the materials contact each other.

5. Install PTFE night capt (19) and retaining nut (G).

Flushing

Flush the valve regularly to remove material build up.

1. Perform Pressure Relief Procedure, page 10.

2. Remove static mixer.

3. To maintain ground continuity, press and hold a

metal part of the dispense valve against the side of

a grounded metal pail then pump solvent through

the gun into the grounded metal pail until clean sol-

vent is dispensed. Use the lowest pressure possible

while dispensing solvent.

This equipment stays pressurized until pressure is

manually relieved. To help prevent serious injury

from pressurized fluid, such as skin injection,

splashing fluid and moving parts, follow the Pressure

Relief Procedure when you stop spraying and before

cleaning, checking, or servicing the equipment.

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