GRACO 25R491 - Medium Pressure Fluid Back Pressure Regulator, 3000 Max psi, 5 gpm Max flow rate, SST, Mechanical w/ locking nut, 3/8" NPT
GRACO 25R491 mechanical back pressure regulator maintains upstream fluid pressure regardless of flow demand, allowing operators to trigger guns, valves and other flow controls without affecting system pressure. This medium pressure BPR provides consistent fluid control crucial for quality finishing processes, with easy installation and spring operation that doesn't require compressed air.
Improve fluid control without having to add a compressed air line with this spring-operated back pressure regulator (BPR).
Additional Specifications
- Flow Rate: 0 - 5 gpm
- Length: 6.25 in. (159 mm)
- Thread: 3/8 in. NPT
- Diameter B: 2.38 in. (60 mm)
- Max Fluid Inlet Pressure: 3000 PSI (20.7 MPa, 207 bar)
- Max Air Working Pressure: ------
- Pressure Category: medium pressure
- Flow Category: low flow
- Mechanism: mechanical with locking nut
- Flow Type: Lower Flow
- Operation: Mechanical
Specifications
| Compatible Material | Waterborne, Solventborne |
| Gauge Port Size (in) | 1/4 |
| Gauge Port Type | NPT |
| Inlet Size (in) | 0.375 |
| Inlet Thread Type | NPT |
| Maximum Air Inlet Pressure (psi) | 100 |
| Maximum Flow Rate (GPM) | 5 |
| Maximum Operating Temperature (°F) | 122 |
| Maximum Regulated Pressure (psi) | 3000 |
| Maximum Viscosity (cP) | 250 |
| Maximum Working Pressure (psi) | 3000 |
| Minimum Operating Temperature (°F) | 32 |
| Minimum Regulated Pressure (psi) | 250 |
| Outlet Size (in) | 0.375 |
| Outlet Thread Type | NPT |
| Type | Back Pressure Regulator |
| Wetted Material | Stainless Steel, Tungsten Carbide, PTFE, Acetal Homopolymer |
Features
- Maintains upstream fluid pressure regardless of flow demand
- Spring operation - no compressed air required
- Easy installation
- Better resolution for accurate pressure adjustment
- Wet parts include stainless steel, tungsten carbide, PTFE, acetal homopolymer
Applications
- Finishing process control
- Quality control for finishing processes
- Fluid control systems where compressed air line addition is not desired
Related Parts
Kit Contents
- 19C099 - CYLINDER, VALVE
- 19Y873 - HOUSING, BPR, MEDIUM PRESS
- 238932 - PISTON, VALVE
- 238933 - SEAT, VALVE
- 113751 - RING, RETAINING, INTERNAL
- 166986 - SPRING, HELICAL
- 189817 - GASKET
- 111796 - SEAL, U-CUP
- 171885 - WASHER
- 166985 - PACKING, O-RING
- 101748 - PLUG, PIPE SST
- 166988 - GUIDE, SPRING
- 20A104 - ADJUSTER, SCREW, BPR, SPRING
- 101970 - PLUG, PIPE, HDLS, optional if gauge is not used
- 20A105 - NUT, LOCK, REGULATOR, BPR
Installation and operation instructions available in manual 3A7681. Part of GRACO's medium pressure BPR family which includes three pneumatic models (1000, 2000, 3000 PSI) and one mechanical model (3000 PSI). Part of back pressure regulator family with different flow and pressure configurations. Has CE and ATEX approvals (Ex h IIB T6 Gb, 0°C to 50°C). Type of Protection is constructional safety 'c.' Assembly includes torque specifications: 175-200 in-lbs (20-23 N•m) for some components and 60-70 ft-lbs (81-95 N•m) for others. Uses NLGI Grade 2 grease (Chevron SRI), Molykote G-N paste for threads, and thread sealant. Some parts are included in Repair Kit 239000 and Repair Kit 17M564.
Reference Manuals
