Graco 25R487 Parts list manual

3A7527B
EN
Instructions - Parts
Low Shear Back
Pressure Regulator
The back pressure regulator (BPR) controls fluid pressure and flow in circulation systems.
For professional use only.
See page 2 for model information, including maximum working
pressure and approvals.
Important Safety Instructions
Read all warnings and instructions in this
manual before usingtheequipment. Save
these instructions.

Related Manuals
23A7527B
Contents
Related Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Models and Approvals . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Air Operated Type . . . . . . . . . . . . . . . . . . . . . . . . 6
Mechanical (spring) Type. . . . . . . . . . . . . . . . . . . 6
Flushing (if required) . . . . . . . . . . . . . . . . . . . . . . 6
Service and Repair. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pressure Relief Procedure. . . . . . . . . . . . . . . . . . 6
Service and Repair Procedures for the BPR . . . . 8
Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Conversion Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Repair Kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Technical Specifications . . . . . . . . . . . . . . . . . . . . 16
California Proposition 65 . . . . . . . . . . . . . . . . . . . . 16
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 18
Related Manuals
Models and Approvals
Manual in English Description
3A4030 Intelligent Paint Kitchen
3A7709 Pneumatic Pump Control Module
Part Description Flow
Range
Regulated
Fluid
Pressure
Max. Fluid
Working
Pressure
psi (MPa, bar)
Max. Air
Working
Pressure
psi (MPa, bar) Approvals
25R487 Air Operated Type (Lower
flow)
0-10 gpm,
0-38 lpm
25-250 psi
(.17-1.72
MPa,
1.7-17.2 bar)
300 psi
(2.1 MPa, 21
bar)
100 psi
(0.7 MPa, 7.0
bar)
25R488 Mechanical (spring) Type
(Lower flow)
0-10 gpm,
0-38 lpm
25R457 Air Operated Type (Higher
flow)
5-25 gpm,
19-95 lpm
25R647 Mechanical (spring) Type
(Higher flow)
5-25 gpm,
19-95 lpm
Ex h IIB T6 Gb
0°C to 50°C
NOTE: Type of Protection
“h” applied is
constructional safety “c.”

Warnings
3A7527B 3
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
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.
• 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.
•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
43A7527B
PRESSURIZED EQUIPMENT HAZARD
Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin and cause
serious injury.
•FollowthePressure Relief Procedure when you stop spraying/dispensing and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, 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) 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.
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. 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.
WARNING

Installation
3A7527B 5
Installation
Install the back pressure regulator (BPR) (A) in the
circulation system fluid return line (B). (See F
IG . 1.) If
more than one spray station is used, install the BPR in
the fluid supply line after the last station. This helps
maintain proper circulating pressures in the system.
1. Connect the fluid return line to the inlet and outlet.
Make sure the flow direction matches the fluid flow
arrow markings on the regulator body.
2. Install the fluid pressure gauge (17) in one of the
fluid pressure gauge ports on the fluid housing. For
an air operated type BPR, see page 9. For a
mechanical (spring) operated type BPR, see page
11. Use thread sealant.
3. Install the plug (16) in the other port on the fluid
housing. Use thread sealant.
4. Air operated type BPR: Connect supply line (C) to
the air inlet of the BPR. The port on top of the air
section is 1/8 NPT. Convert port to 1/4 NPT male
with supplied fitting, if desired.
Key:
A Air Operated Type Back Pressure Regulator
B Fluid Return Line
C Back Pressure Regulator Air Supply Line (not required for
mechanical (spring) type BPR)
D Air Regulator or BPR Controller
E Fluid Supply Line
F Fluid Pressure Regulator
G Air Spray Gun
H Gun Air Supply Line
NOTICE
If an isolation valve is installed downstream of the BRP
in the circulation line, the maximum circulation pump
pressure is not to exceed 600 psig (4.1 MPa, 41 bar).
Pressure greater than 600 psi might damage the BPR.
NOTICE
Handle the back pressure regulator with care to avoid
damaging the diaphragm.
NOTICE
When installing the gauge, use very little thread seal-
ant on the male threads to avoid plugging the gauge.
F IG . 1. Typical Installation
8719c
Fluid Flow A
B
CD
F
G
H
G
F
E
H
E
E
E
Fluid Flow

Operation
63A7527B
Grounding
Operation
NOTE: The BPR controls fluid pressure ahead of its
inlet.
Air Operated Type
Adjust the air pressure regulator (D) to the desired fluid
back pressure using the ratios below:
• For lower flow units (25R487):
The fluid:air ratio is approximately 3:1; 83 psi (0.6
MPa, 5.7 bar) inlet air pressure = 250 psi (0.6 MPa,
17.2 bar) inlet fluid pressure.
• For higher flow units (25R457):
The fluid:air ratio is approximately 2.5:1; 100 psi
(0.7 MPa, 7.0 bar) inlet air pressure = 250 psi (0.6
MPa, 17.2 bar) inlet fluid pressure.
Do not exceed the maximum air pressure of 100 psi (0.7
MPa, 7.0 bar).
Mechanical (spring) Type
Turn the adjusting screw clockwise to increase pressure
and counterclockwise to decrease pressure.
Flushing (if required)
Flush the back pressure regulator with a compatible
solvent whenever the rest of the system is being
flushed. Fully open the back pressure regulator when
flushing.
Service and Repair
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Shut off the circulation system pump.
2. Adjust the BPR to full open, and open drain valves
in the circulation system to fully relieve circulation
system pressure.
For the pneumatic section of the BPR, relieve the air
pressure by reducing the regulated air pressure to
zero and disconnecting the air supply line from the
BPR.
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Install the BPR into piping that is
properly grounded. Grounding provides an escape
wire for the electric current.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as splashing fluid and moving
parts, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.

Service and Repair
3A7527B 7
F IG . 2. Sections of the Back Pressure Regulator
Air Operated Models
Mechanical (Spring)
Models
Spring section components
Fluid section components
Air section components
◆Higher flow versions only
◆
◆

Service and Repair
83A7527B
Service and Repair Procedures
for the BPR
NOTE: Regular cleaning and inspection of the BPR,
based on the degree and kind of service, is essential.
1. Shut off the pump.
2. On spring models, open the BPR by turning the
adjustment screw (43) counterclockwise until no
spring pressure is felt. See F
IG . 4.
3. Follow the Pressure Relief Procedure on page 6 to
relieve all air and fluid pressures in the system.
NOTE: The BPR can either be serviced on line or
removed from the circulation line for service.
4. Clean the BPR with a compatible solvent when ser-
vicing and repairing the BPR.
5. To repair the BPR see the following instructions,
according to your equipment (see F
IG . 2):
- For the air section components of the BPR, see
Air Section Components Service and Repair.
- For the spring section components, see
Mechanical (Spring) Components Service
and Repair.
- For the fluid section components see Fluid
Section Components Service and Repair.
Air Section Components Service and
Repair
See F IG . 3. The air section housing (15) can be removed
by unscrewing it from the BPR and repaired offline, if
desired.
Inspect the piston rod (15b), the diaphragm (15e), and
the support washer plate (15c) for damage. Replace
parts as needed.
Mechanical (Spring) Components Service
and Repair
See F IG . 4. Inspect the cap (42), spring guide (41),
spring (40), spring spacer (44), and spring bearing (45)
for damage. Replace parts as needed.
Fluid Section Components Service and
Repair
See F IG . 3. Inspect plate (7), gasket (13) on 25R487
only, diaphragm (2), diaphragm gasket (3), gasket (4),
retainer (5), stud (6), and seat (10). Replace parts as
needed.
NOTES:
• Replace o-ring (18) during every inspection.
• Replace o-ring (9) when removing the seat (10).

Parts
3A7527B 9
Parts
25R457 Higher Flow Air Operated BPR
25R487 Lower Flow Air Operated BPR
F IG . 3. Parts of an Air Operated BPR
25R457
25R487
Torque to 30-33 in-lbs (3.4–3.7 N•m) in alternating pattern.
Then, torque to 68-72 in-lbs (7.7–8.1 N•m) in alternating pattern.
11
15e
15c
10
9
6
15f
12
5
4
18
8
1
2
3
7
15a
15b
15d
15g
17
16
24
Torque twice to 13–15 ft-lbs (17.6–20.3 N•m)
1
2
Torque in alternating pattern to 125±5 in-lbs (169.5–6.7 N•m) 3 times
4
3
Apply threadlocker to threads (Loctite
®
243)
Apply lubricant to threads or surface (Lubriplate
®
930-AA)
5
6
7
Torque to 15–20 ft-lbs (20.3–27.1 N•m)
Torque to 35–45 ft-lbs (47.5–61 N•m)
Apply liquid thread sealant
Torque assembly (15) to 95–105 ft-lbs (128.8–142.3 N•m)
8
9
5
3 9
4
4
4
2
3
7
6
8
8
1
9
13★
★For 25R487 only

Parts
10 3A7527B
25R457 Higher Flow Air Operated
25R487 Lower Flow Air Operated
Purchase conversion kits separately:
* Parts included in Conversion Kit 25T509.
†Parts included in Conversion Kit 25T508.
See
Conversion Kits on page 13.
†† Included in Diaphragm Kits 25R842 and 25T507.
Ref. Part Description Qty.
1 19Y643 (25R457) ADAPTER 1
19Y623 (25R487) ADAPTER† 1
2†† 19Y646 (25R457) DIAPHRAGM 1
172193 (25R487) DIAPHRAGM 1
3†† 19Y647 (25R457) GASKET* 1
171912 (25R487) GASKET† 1
4†† 171913 GASKET 1
5†† 19Y630 RETAINER, DIAPHRAGM,
PLATE, 2-PIECE 1
6†† 19Y626 RETAINER,DIAPHRAGM,STUD,
2-PIECE 1
7†† 19Y948 (25R457) PLATE, DIAPHRAGM,
FLUID, STEEL, 3.4" diameter 1
164864 (25R487) PLATE, DIAPHRAGM,
2.5" diameter 1
8†† 100111 NUT 1
9 166612 (25R457) PACKING, O-RING 1
111603 (25R487) PACKING, O-RING 1
10 19Y652 (25R457) SEAT 1
19Y624 (25R487) SEAT 1
11 19Y651 (25R457) BODY, FLUID 1
19Y622 (25R487) BODY, FLUID 1
12†† 101682 SCREW, CAP, SCH*† 10/6
25R457: Qty 10
25R487: Qty 6
13†† 19C044 (25R487) GASKET 1
15 25R448 (25R457) HOUSING, AIR
SECTION* 1
25R489 (25R487) HOUSING, AIR
SECTION† 1
15a 19Y628 HOUSING, DIAPHRAGM*† 1
15b 19Y627 ROD, PISTON*† 1
15c 192194 (25R457) PLATE, SUPPORT
WASHER, 5.3" diameter* 1
15J461 (25R487) WASHER, SUPPORT,
3.0" diameter*† 1
15d C20811 SCREW, SOCKETHEAD, FLAT*† 1
15e 180979 DIAPHRAGM*† 1
15f 180981 COVER, DIAPHRAGM*† 1
15g 114104 SCREW, MACHINE, HEX WASH
HEAD*† 12
16 101970 PLUG, PIPE 1
17 187876 GAUGE, PRESSURE, FLUID 1
18†† 157277 PACKING, O-RING 1
24 151519 FITTING, NIPPLE, REDUCING
(optional) 1
Ref. Part Description Qty.