Graco 24R021 Parts list manual

332198C
EN
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
AC
D
E
E
B
F
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
G
H
J
K
L
M

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.