Graco 25R487 Parts list manual

3A7527B

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

. 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.

. 1. Typical Installation

8719c

Fluid Flow A

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

. 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

. 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

. 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

. 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

. 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

. 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

. 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.

15e

15c

15f

15a

15b

15d

15g

Torque twice to 13–15 ft-lbs (17.6–20.3 N•m)

Torque in alternating pattern to 125±5 in-lbs (169.5–6.7 N•m) 3 times

Apply threadlocker to threads (Loctite

243)

Apply lubricant to threads or surface (Lubriplate

930-AA)

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)

3 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.

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