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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 using the equipment. Save
these instructions.
3A7527B
EN
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Table of Contents
Related Manuals for Graco 25R487
Summary of Contents for Graco 25R487
- Page 1 Instructions - Parts Low Shear Back Pressure Regulator 3A7527B 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 using the equipment.
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Page 2: Table Of Contents
Mechanical (spring) Type....6 Graco Standard Warranty ....18 Flushing (if required) . -
Page 3: Warnings
Warnings 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. - Page 4 Warnings WARNING PRESSURIZED EQUIPMENT HAZARD Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin and cause serious injury. • Follow the Pressure Relief Procedure when you stop spraying/dispensing and before cleaning, checking, or servicing equipment. •...
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Page 5: Installation
Installation Installation 1. Connect the fluid return line to the inlet and outlet. NOTICE Make sure the flow direction matches the fluid flow If an isolation valve is installed downstream of the BRP arrow markings on the regulator body. in the circulation line, the maximum circulation pump 2. -
Page 6: Grounding
Pressure Relief Procedure when you • For lower flow units (25R487): stop spraying and before cleaning, checking, or servicing the equipment. The fluid:air ratio is approximately 3:1; 83 psi (0.6 MPa, 5.7 bar) inlet air pressure = 250 psi (0.6 MPa,... - Page 7 Service and Repair Mechanical (Spring) Models Air Operated Models Air section components Spring section components ◆ ◆ Fluid section components ◆ Higher flow versions only . 2. Sections of the Back Pressure Regulator 3A7527B...
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Page 8: Service And Repair Procedures For The Bpr
Repair NOTE: The BPR can either be serviced on line or See F . 3. Inspect plate (7), gasket (13) on 25R487 removed from the circulation line for service. only, diaphragm (2), diaphragm gasket (3), gasket (4), retainer (5), stud (6), and seat (10). Replace parts as 4. -
Page 9: Parts
Parts Parts 25R457 Higher Flow Air Operated BPR 25R487 Lower Flow Air Operated BPR 13★ 25R457 25R487 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) ®... - Page 10 Parts 25R457 Higher Flow Air Operated 25R487 Lower Flow Air Operated Ref. Part Description Qty. Ref. Part Description Qty. 13†† 19C044 (25R487) GASKET 19Y643 (25R457) ADAPTER 25R448 (25R457) HOUSING, AIR 19Y623 (25R487) ADAPTER† SECTION* 2†† 19Y646 (25R457) DIAPHRAGM 25R489 (25R487) HOUSING, AIR 172193 (25R487) DIAPHRAGM SECTION†...
- Page 11 Parts 25R647 Higher Flow Mechanical (Spring) 25R488 Lower Flow Mechanical (Spring) To convert to air, remove parts and replace with conversion kit parts. See page 13. 25R647 25R488 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 ®...
- Page 12 Parts 25R647 Higher Flow Mechanical (Spring) 25R488 Lower Flow Mechanical (Spring) Ref. Part Description Qty. Ref. Part Description Qty. 19Y651 (25R647) BODY, FLUID 19Y643 (25R647 only) ADAPTER 19Y622 (25R488) BODY, FLUID 19Y646 (25R647) DIAPHRAGM 101682 SCREW, CAP, SCH 172193 (25R488) DIAPHRAGM 070268 LUBRICANT, GREASE 19Y647 (25R647) GASKET, DIAPHRAGM 101970 PLUG, PIPE, HDLS...
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Page 13: Conversion Kits
Repair Kits (for 25R457 and 25R647) (for 25R487 and 25R488) Diaphragm kit includes refs. 2, 3, 4, 5, 6, 7, 8, 12, 25T507 25R842 13 (for 25R487 only), 18 (see pages 9 and 11) Accessories Fluid Connection Adapters Size Connection... -
Page 14: Dimensions
Dimensions Dimensions 25R457 25R487 Air Operated Type 25R488 25R647 Mechanical, Spring Type Part Description 5.4 in. (137 mm) 25R457 Higher Flow Air Operated Type 6.5 in. (165 mm) 5.2 in. (132 mm) 25R487 Lower Flow Air Operated Type 6.3 in. (160 mm) 8.8 in. - Page 15 Dimensions . 5. Part Number on Air Section Housing (15) . 6. Part Number on Regulator (42) Note: The MAX WPR 100 PSI is for the air section. . 7. Inlet and Outlet Flow on Regulator (42) Bottom 3A7527B...
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Page 16: Technical Specifications
3 cP to 1000 cP Fluid Flow Range Lower Flow Models 25R488 Mechanical (Spring) Type 0-10 gpm 0-38 lpm 25R487 Air Operated Type Higher Flow Models 25R647 Mechanical (Spring) Type 5-25 gpm 19-95 lpm 25R457 Air Operated Type Inlet/Outlet Sizes Air inlet size 1/4 in. - Page 17 California Proposition 65 3A7527B...
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Page 18: Graco Standard Warranty
With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective.