Graco 25R490 Instructions - Parts Manual Download

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3A7681A

Instructions-Parts

Medium Pressure Back
Pressure Regulators

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.

Optional gauges are shown.

Summary of Contents for 25R490

Page 1: ...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 warnin...

Page 2: ...l in English Description 3A4030 Intelligent Paint Kitchen 3A7709 Pneumatic Pump Control Module Part Description Flow Range Regulated Fluid Pressure Max Fluid Inlet Pressure Max Air Working Pressure Ap...

Page 3: ...k 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...

Page 4: ...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 c...

Page 5: ...gs on the BPR housing 3 Install an accessory gauge if used in the 1 4 inch gauge port Install plugs in the unused inlets and outlets 4 If more than one spray station is used install the BPR A in the F...

Page 6: ...d Return Line E Fluid Regulator F Air Assisted Airless Spray Gun G Air Line H Air Regulator Pilot Air Air Filter not shown J Bleed Type Shut Off Valve Air K Shut Off Valve Fluid L Drain Valve not show...

Page 7: ...n the tip guard retaining nut or the hose end coupling to relieve pressure gradually b Loosen the nut or the coupling completely c Clear the obstruction in the hose or tip Adjusting the BPR The BPR co...

Page 8: ...and lubrication of the BPR are necessary to keep the BPR working properly 1 Follow the Pressure Relief Procedure on page 7 2 Remove the BPR from the system 3 Disassemble the BPR referring to the part...

Page 9: ...low Medium Pressure BPR Pneumatic 25R490 shown 3 1 4 4 7 6 10 1 2 12 8 1 5 9 13 4 14 1 11 1 6 1 1 7 5 6 Apply NLGI Grade 2 grease Chevron SRI Torque to 175 200 in lbs 20 23 N m Apply metal assembly pa...

Page 10: ...25T477 PISTON AIR ACTUATOR REGULATOR BP 20 1 1 19B730 25T478 PISTON AIR ACTUATOR REGULATOR BP 10 1 1 7 189817 GASKET 1 8 111796 SEAL U CUP 1 9 171885 WASHER 1 10 166985 PACKING O RING 1 11 19B484 25R...

Page 11: ...ue to 60 70 ft lbs 81 95 N m 5 5 6 Ref Part Description Qty 1 19C099 CYLINDER VALVE 1 2 19Y873 HOUSING BPR MEDIUM PRESS 1 3 238932 PISTON VALVE 1 4 238933 SEAT VALVE 1 5 113751 RING RETAINING INTERNAL...

Page 12: ...auges Part Number Inlet Maximum WPR Wetted Parts Case Description Case Dial Diameter in mm Mount Style psi bar MPa 105770 1 4 in npt m 1000 69 6 9 Brass SST liquid filled 2 5 64 Bottom 17L706 1 4 in n...

Page 13: ...77 25R490 25R491 Air Operated Type Mechanical Part Description A B 25T478 Air Operated Type 4 84 in 123 mm 2 38 in 60 mm 25T477 4 84 in 123 mm 2 38 in 60 mm 25R490 4 84 in 123 mm 2 38 in 60 mm 25R491...

Page 14: ...50 3000 psi 17 207 bar 25R491 mechanical Flow range 0 5 gpm 0 19 Ipm Maximum fluid temperature 122 F 50 C Maximum recommended viscosity 200 250 cP depending on flow rate Inlet Outlet Sizes Air inlet s...

Page 15: ...Notes 3A7681A 15 Notes...

Page 16: ...n material or workmanship repairs will be made at a reasonable charge which charges may include the costs of parts labor and transportation THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRA...