Graco SERIES F Operation manual

HIGH PRESSURE
Back Pressure Regulator
For use in a high pressure spray circulating system to regulate back pressure to gun(s)
and maintain proper pressure for circulation. For professional use only.
Not approved for use in European explosive atmosphere locations.
CARBON STEEL REGULATORS
Part No. 206819, Series F
3000 psi (21 MPa, 207 bar) Maximum Working Pressure
1000–3000 psi (7–21 MPa, 70–207 bar) Regulated Fluid Pressure Range
Part No. 222405, Series B
3000 psi (21 MPa, 207 bar) Maximum Working Pressure
0–1000 psi (0–7 MPa, 0–70 bar) Regulated Fluid Pressure Range
STAINLESS STEEL REGULATOR
Part No. 238926, Series A
3000 psi (21 MPa, 207 bar) Maximum Working Pressure
1000–3000 psi (7–21 MPa, 70–207 bar) Regulated Fluid Pressure Range
Part No. 26A081, Acid Compatible
3000 psi (21 MPa, 207 bar) Maximum Working Pressure
1000–3000 psi (7–21 MPa, 70–207 bar) Regulated Fluid Pressure Range
Table of Contents
Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 12. . . . . . . . . . . . . . . . . . . . . . . . . .
Instructions–Parts List
306860S
EN
06863
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.

2 306860
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
WARNING
INSTRUCTIONS
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.
DThis equipment is for professional use only.
DRead all instruction manuals, tags, and labels before operating the equipment.
DUse the equipment only for its intended purpose. If you are not sure, call your Graco distributor.
DDo not alter or modify this equipment.
DCheck equipment daily. Repair or replace worn or damaged parts immediately.
DDo not exceed the maximum working pressure of the lowest rated system component. Refer to the
Technical Data on page 11 for the maximum working pressure of this equipment.
DUse fluids and solvents which are compatible with the equipment wetted parts. Refer to the Tech-
nical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.
DRoute hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 180_F (82_C) or below –40_F (–40_C).
DWear hearing protection when operating this equipment.
DDo not lift pressurized equipment.
DComply with all applicable local, state, and national fire, electrical, and safety regulations.

306860 3
WARNING
INJECTION HAZARD
Spray from the gun, leaks or ruptured components can inject fluid into your body and cause extremely
serious injury, including the need for amputation. Fluid splashed in the eyes or on the skin can also
cause serious injury.
DFluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate medi-
cal attention.
DDo not stop or deflect leaks with your hand, body, glove or rag.
DKeep your hands away from the end of the drain valve when opening it.
DLock the gun trigger safety when you stop spraying.
DFollow the Pressure Relief Procedure on page 7 if the spray tip clogs and before cleaning,
checking or servicing the equipment.
DFollow the Pressure Relief Procedure on page 7 before removing the regulator’s adjusting knob.
DDo not pressurize the system when the back pressure regulator’s adjusting knob is removed.
DTighten all fluid connections before operating the equipment.
DCheck the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
Do not repair high pressure couplings; you must replace the entire hose.
DUse only Graco approved hoses. Do not remove the spring guard that is used to help protect the
hose from rupture caused by kinks or bends near the couplings.
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can cause serious injury or death if splashed in the eyes or on the skin,
inhaled, or swallowed.
DKnow the specific hazards of the fluid you are using.
DStore hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
DAlways wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.

4 306860
Important Acid Catalyst Information
Regulator model 26A081 is designed for acid catalyst (”acid”) currently used in two–component, wood finishing
materials. Current acids in use (with pH levels as low as 1) are more corrosive than earlier acids. More corrosion–
resistant wetted materials of construction are required, and must be used without substitution, to withstand the
increased corrosive properties of these acids.
WARNING
Acid is flammable, and spraying or dispensing acid creates potentially harmful mists, vapors, and
atomized particulates. To help prevent fire and explosion and serious injury:
DRead and understand the fluid manufacturer’s warnings and Safety Data Sheet (SDS) to know
specific hazards and precautions related to the acid.
DUse only genuine, manufacturer’s recommended acid–compatible parts in the catalyst system
(hoses, fittings, etc.). A reaction may occur between any substituted parts and the acid.
DTo prevent inhalation of acid 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 acid
manufacturer’s SDS.
DAvoid all skin contact with acid. Everyone in the work area must wear chemically impermeable
gloves, protective clothing, foot coverings, aprons, and face shields as recommended by the acid
manufacturer and local regulatory authority. Follow all fluid manufacturer recommendations, includ-
ing those regarding handling of contaminated clothing. Wash hands and face before eating or
drinking.
DRegularly inspect equipment for potential leaks and remove spills promptly and completely to avoid
direct contact or inhalation of the acid and its vapors.
DKeep acid away from heat, sparks, and open flames. Do not smoke in the work area. Eliminate all
ignition sources.
DStore acid in the original container in a cool, dry, and well–ventilated area away from direct sunlight
and away from other chemicals in accordance with acid manufacturer’s recommendation. To avoid
corrsion of containers, do not store acid in substitute containers. Reseal the original container to
prevent vapors from contaminating the storage space and surrounding facility.
Moisture Sensitivity of Acid Catalysts
Acid catalysts can be sensitive to atmospheric moisture and other contaminants.
Notice
Acid build–up will damage the seals and reduce the performance and life of the regulator. To prevent exposing
acid to moisture:
DAlways use a sealed container with a desiccant dryer in the vent, or a nitrogen atmosphere. Never store acids
in an open container.
DUse only moisture–proof hoses compatible with acids.
DAlways lubricate threaded parts with an appropriate lubricant when reassembling.

306860 5
Installation
The Typical Installations shown in Figs. 1 and 2 are
only guides in designing a system. For assistance in
designing a system to meet your needs, contact your
Graco distributor.
Installing the Back Pressure Regulator
1. Install the back pressure regulator (A) in the spray
gun return line (D). See Figs. 1 and 2.
2. Connect fluid lines to the 1/4 npt(f) inlet and outlets
of choice. Make sure the fluid flow agrees with the
IN and OUT markings on the regulator housing.
3. Install the accessory gauge, if used, in the optional
inlet.
4. If more than one spray station is used, install a
back pressure regulator (A) in the circulating line
(H) after the last spray station to maintain proper
system pressures. Refer to Fig. 2, for multiple
circulating spray stations.
NOTE: The two 1/4–20 tapped mounting holes on the
side of the regulator housing are for mounting the
regulator when flexible fluid lines are used.

6 306860
Installation
06865
KEY
A Back Pressure Regulator
B Air Filter/Regulator
C Fluid Supply Line
D Fluid Return Line
E Fluid Regulator
F Air-Assisted Airless Spray Gun
G Air Line
Fig. 1 SINGLE CIRCULATING SPRAY STATION
F
D
G
A
B
C
E
06866
Fig. 2 MULTIPLE CIRCULATING SPRAY STATION
KEY
A Back Pressure Regulator
B Air Filter/Regulator
C Fluid Supply Line
D Fluid Return Line
E Fluid Regulator
F Air-Assisted Airless Spray Gun
G Air Line
H Fluid Circulation Line
F
D
G
A
B
C
E
D
E
AA
B
G
G
C
C
H

306860 7
Operation
Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
Dare instructed to relieve the pressure,
Dstop spraying,
Dcheck or service any of the system equipment,
Dor install or clean the spray tip.
1. Lock the gun trigger safety.
2. Close the bleed-type master air valve (required in
your system).
3. Unlock the gun trigger safety.
4. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
5. Lock the gun trigger safety.
6. Open the drain valve (required in your system),
having a container ready to catch the drainage.
7. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear
the tip or hose.
Adjusting the Regulator
The back pressure regulator controls pressure ahead
of the regulator intake.
To adjust the regulator, first, back the adjusting knob
out until there is no spring pressure. Then, turn the
knob clockwise to increase pressure.
Adjust the pump air pressure and the back pressure
regulator for the best spraying combination and proper
circulation of fluid.
Record the regulator and air pressure settings for
future reference. The regulator cylinder has exterior
markings (set points 1 to 8) for repeat settings.

8 306860
Maintenance
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of serious bodily inju-
ry, including fluid injection or splashing in
the eyes or on the skin, always follow
the Pressure Relief Procedure on page 7 before
adjusting, cleaning, repairing, or removing the regu-
lator from the system.
Never pressurize the system with the back pres-
sure regulator adjusting knob removed.
Never completely remove the adjusting knob when
system pressure is present.
Flushing
Flush the regulator whenever the rest of the system is
flushed. Before flushing, open the regulator by turning
the adjusting knob counterclockwise until the spring
tension is relieved.
NOTE: Do not allow paint or solvent to set in the
system for a long time. Fluid could dry on the piston,
causing leakage at the piston packing. If leakage
occurs, disassemble and clean the regulator.
Cleaning
Regular cleaning and inspection, and lubrication of the
regulator are necessary to keep the regulator working
properly.
1. Open the regulator and follow the Pressure Relief
Procedure on page 7.
2. Remove the back pressure regulator from the
system.
3. Disassemble the regulator, referring to the parts
drawing on page 9. Clean and inspect all parts.
CAUTION
Use special care when handling the hard carbide
portions of the piston (13) and seat (12). Damage will
cause poor operation and leakage.
Repairing
Reference numbers marked with an asterisk (for
example, 3*) are included in the repair kits, which may
be purchased separately. For Models 206819 and
222405, order Repair Kit 220135. For Model 238926,
order Repair Kit 239000. For Model 26A081, order
Repair Kit 17M564. See page 9.
1. Lubricate the piston packing (9*), piston (13*), and
spring locater (10) with lithium base grease.
2. Place the washer (6) over the pointed end of the
piston (13*).
3. Place the packing (9*), with its lips facing down,
over the pointed end of the piston (13*) and
against the washer (6).
4. Insert the piston (13*) into the bottom of the cylin-
der (4) and gently work it into place.
5. Reassemble the remaining parts in reverse order
of disassembly. Make sure the gasket (3*) and
o-ring (7*) are in place. Torque the regulator seat
(12*) into the housing (5) to 175 to 200 in-lb (20 to
22 NSm). Over-tightening could break off the hex
portion of the seat.

306860 9
Parts
06864
11
Install with lips down.
Torque to 175 to 200 in-lb (20 to 22 NSm).
8
10
4
12*
3*
7*
5
1
Model and Series stamped on bottom.
1
3
2
13*
2
6
9* 1
2
3
Model 206819, Series F
Model 222405, Series B
Ref
No. Part No. Description Qty
1*** 100721 PLUG, pipe; hex socket; 1/4 npt 2
2 101954 RING, int. ret.; 0.75 in. (19 mm)
housing dia.; cadmium plated 1
3* 150670 GASKET, copper 1
4 166982 CYLINDER, regulator 1
5 177124 HOUSING, regulator 1
6 171885 WASHER, back-up; acetal
homopolymer 1
7* 166985 O-RING; PTFE 1
8 166986 SPRING, helical compression;
yellow color-coded
(Model 206819 only) 1
501511 SPRING, helical compression;
blue color-coded
(Model 222405 only) 1
9* 111796 PACKING, “U” type; PTFE 1
10 166988 LOCATOR, spring 1
11 167443 KNOB, adjusting 1
12* 204523 SEAT, regulator 1
13* 238932 PISTON, regulator 1
* These parts are included in Repair Kit 220135,
which may be purchased separately.
** These parts are included in Repair Kit 239000
(Model 238926) and Repair Kit 17M564 (Model
26A081), which may be purchased separately.
*** Plugs are shipped loose and must be installed in
unused ports. Apply anaerobic pipe sealant prior to
installation.
Model 238926, Series A
Model 26A081, Acid Compatible
Ref
No. Part No. Description Qty
1 101970 PLUG, pipe; hex socket; 1/4 npt 2
2 113751 RING, int. ret.; 0.75 in. (19 mm)
housing dia.; stainless steel 1
3** GASKET; acetal homopolymer 1
189817 (Model 238926 only)
17K950 (Model 26A081 only)
4 191840 CYLINDER, regulator 1
5 HOUSING, regulator 1
191841 (Model 238926 only)
17K951 (Model 26A081 only)
6 WASHER, back-up; acetal
homopolymer 1
171885 (Model 238926 only)
121169 (Model 26A081 only)
7** 166985 O-RING; PTFE 1
8 SPRING, helical compression;
yellow color-coded 1
166986 (Model 238926 only)
501511 (Model 26A081 only)
9** 111796 PACKING, “U” type; PTFE 1
10 166988 LOCATOR, spring 1
11 167443 KNOB, adjusting 1
12** SEAT, regulator 1
238933 (Model 238926 only)
17K953 (Model 26A081 only)
13** PISTON, regulator 1
238932 (Model 238926 only)
26A082 (Model 26A081 only)

10 306860
Notes