Table of Contents
Advertisement
Quick Links
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.
3A7681A
Optional gauges are shown.
EN
Advertisement
Table of Contents
Related Manuals for Graco 25T478
Summary of Contents for Graco 25T478
- Page 1 Instructions-Parts Medium Pressure Back Pressure Regulators 3A7681A 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.
-
Page 2: Table Of Contents
Notes ........15 Graco Standard Warranty ....16... -
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 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.
-
Page 5: Installation
For assistance in designing a system BPR (A) in the Fluid Return Line (D) after the last to meet your needs, contact your Graco distributor. spray station to maintain proper system pressures. 5. Install an air line to the top fitting on the BPR (A) for Install the Back Pressure air piloted models. - Page 6 Installation . 1: Typical Installation: Single Circulating Spray Station Key: Back Pressure Regulator (BPR) Air Line Air Filter/Regulator Air Regulator (Pilot Air) (Air Filter not shown) Fluid Supply Line Bleed Type Shut Off Valve (Air)* Fluid Return Line Shut Off Valve (Fluid) Fluid Regulator Drain Valve (not shown)* Air-Assisted Airless Spray Gun...
-
Page 7: Operation
Operation Operation Pressure Relief Procedure 7. Open the Drain Valve (L) (required in your system). Have a container ready to catch the drainage. Follow the Pressure Relief Procedure whenever 8. Leave the drain valve open until you are ready to you see this symbol. -
Page 8: Maintenance
Maintenance Maintenance Cleaning Regular cleaning and inspection, and lubrication of the BPR are necessary to keep the BPR working properly. To reduce the risk of serious bodily injury, including fluid injection or splashing in the eyes or on the skin, 1. -
Page 9: Parts
Parts Parts 25R490, 25T477, 25T478 Lower Flow Medium Pressure BPR, Pneumatic Apply NLGI Grade 2 grease (Chevron SRI). Torque to 175–200 in-lbs (20–23 N•m). Torque to 60–70 ft-lbs (81–95 N•m). Apply metal assembly paste to threads ® (Molykote G-N paste). - Page 10 19B484 (25R490) SEAL, U-CUP, PRESS, 20:1 SYMETRIC, BEVEL, LITE 19B728 (25T478) CYLINDER, 113249 (25T477) PACKING, U-CUP REGULATOR, BP, MEDIUM 112181 (25T478) SPACKING, U-CUP PRESS, 10:1 101748 PLUG, PIPE SST 19Y873 HOUSING, REGULATOR, BP, 19Y872 (25R490) COVER, REGULATOR, MEDIUM PRESS BP, AIR, UPPER, MP...
- Page 11 Parts 25R491 Lower Flow Medium Pressure BPR, Mechanical Apply NLGI Grade 2 grease (Chevron SRI). Torque to 175–200 in-lbs (20–23 N•m). Torque to 60–70 ft-lbs (81–95 N•m). Apply metal assembly paste to threads ® (Molykote G-N paste). Apply thread sealant. .
-
Page 12: Accessories
Accessories Accessories Stainless Steel Gauges Maximum WPR Case & Dial Wetted Case Diameter Mount Part Number Inlet Parts Description (in/mm) Style 1/4 in. SST liquid 105770 1000 Brass 2.5 (64) Bottom npt(m) filled 1/4 in. SST liquid 17L706 3000 2.5 (64) Bottom npt(m) filled... -
Page 13: Dimensions
Dimensions Dimensions 25T478 25T477 25R490 Air Operated Type 25R491 Mechanical Part Description 4.84 in. (123 mm) 2.38 in. (60 mm) 25T478 4.84 in. (123 mm) 25T477 Air Operated Type 2.38 in. (60 mm) 4.84 in. (123 mm) 25R490 2.38 in. (60 mm) 6.25 in. -
Page 14: Technical Specifications
Maximum fluid inlet pressure 3000 psi 21 MPa, 207 bar Maximum air pressure (Air Operated Type) 100 psi 0.7 MPa, 7 bar Regulated fluid pressure range 25T478 (10:1) 100–1000 psi* 7–70 bar* 25T477 (20:1) 250–2000 psi 17–138 bar 25R490 (30:1) 250–3000 psi... -
Page 15: Notes
Notes Notes 3A7681A... -
Page 16: 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.