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VR
Relief Valve
Category
- Instruments | Valve | Relief Valve
- Dimensions
- How To Order
- Specifications
- Features
Dimensions
| Part No. | End Connections | Dimensions (mm) | |||||
| Inlet | Outlet | Orifice | L | h | H | ||
| VR3 or VR6 | U-04T- | 1/4" UNILOK | VR3 : 4.8 VR6 : 3.5 | 39.6 | 39.6 | 109.5 | |
| U-06T- | 3/8" UNILOK | 43.8 | 43.8 | 113.7 | |||
| U-08T- | 1/2" UNILOK | 46.5 | 46.5 | 116.5 | |||
| U-M06T- | 6mm UNILOK | 39.6 | 39.6 | 109.5 | |||
| U-M08T- | 8mm UNILOK | ||||||
| U-M12T- | 12mm UNILOK | 46.6 | 46.6 | 116.5 | |||
| MF-04N- | 1/4" Male NPT | 1/4" Female NPT | 32.5 | 32.5 | 102.4 | ||
| MF-06N- | 3/8" Male NPT | 3/8" Female NPT | 34.5 | ||||
| MF-08N- | 1/2" Male NPT | 1/2" Female NPT | 38.0 | 36.5 | 106.4 | ||
| MU-08N08T- | 1/2" Male NPT | 1/2" UNILOK | 46.5 | ||||
| MU-08NM12T- | 1/2" Male NPT | 12mm UNILOK | |||||
How To Order
UNILOK VR series relief valves are ordered by part number as shown below.
Example: The following part number, VR3MU-08N08T-SS is designated for VR3 series low pressure relief valve with 1/2" male NPT x 1/2" UNILOK tube fitting, 316SS.
| V | R3 | MU | - | 08N08T | - | SS | - | |
| UNILOK Valve | Valve Type | Connection Type | Connection Size | Body Materials | Spring Type | |||
| Valve Type | Connection Size | Spring Type | |||||||||||||
| R3 | Low Pressure, 300psig | Fractional(Inch) Tube O.D. Designation | Designator | Color | Cracking Pressure (psig) | ||||||||||
| R6 | High Pressure, 6000psig | Tube O.D. | inch | 1/4 | 3/8 | 1/2 | |||||||||
| mm | 6.35 | 9.52 | 12.70 | Y | Yellow | 350 ~ 750 | |||||||||
| Connection Type | Designator | 04T | 06T | 08T | P | Purple | 750 ~ 1500 | ||||||||
| U | UNILOK Tube Fitting | O | Orange | 1500 ~ 2250 | |||||||||||
| F | Female NPT or ISO7/1(PT) | Metric Tube O.D. Designation | B | Brown | 2250 ~ 3000 | ||||||||||
| M | Male NPT or ISO7/1(PT) | Tube O.D. | mm | 6 | 8 | 12 | W | White | 3000 ~ 4000 | ||||||
| Designator | M06T | M08T | M12T | R | Red | 4000 ~ 5000 | |||||||||
| G | Green | 5000 ~ 6000 | |||||||||||||
| Pipe Size Designation (NPT or ISO7/1-PT) | Options are only for VR6 series. VR3 series spring is yellow color and cracking pressure range with 10~250psig. | ||||||||||||||
| Pipe Size | 1/4 | 3/8 | 1/2 | ||||||||||||
| Designator | 04N/R | 06N/R | 08N/R | ||||||||||||
Specifications
| Specification | Reseal Pressure | Spring Color Coding and Cracking Pressure Range | ||||||||||
| Specification | VR3 series | VR6 Series | 0.3pt | Test Set Pressure | Minimum Resealing
Pressure (%) | Series | Color | Cracking Pressure Range | ||||
| Maxium Working Pressure | 300
psig 20.6 bar | 6000
psig 413 bar | psig | bar | psig | bar | ||||||
| VR3 | 10 ~ 20 | 0.7 ~ 1.3 | 50 | VR3 | Yellow | 10 ~ 250 | 0.7 ~ 18 | |||||
| Temperature Range | -23 ~ 204℃ -10 ~ 400℉ | 175 ~ 225 | 12.0 ~ 15.5 | 90 | VR6 | Yellow | 225 ~ 750 | 15.5 ~ 52 | ||||
| VR6 | 100 ~ 200 | 6.8 ~ 13.7 | 50 | Purple | 750 ~ 1500 | 52 ~ 103 | ||||||
| Cracking Pressure Range | 10~250 psig 0.7~18 bar | 350~6000 psig 25~413 bar | 850 ~ 1000 | 58.5 ~ 68.9 | 84 | Orange | 1500 ~ 2250 | 103 ~ 155 | ||||
| Minimum Resealing Pressure - As a percentage of test set pressure | Brown | 2250 ~ 3000 | 155 ~ 206 | |||||||||
| White | 3000 ~ 4000 | 206 ~ 275 | ||||||||||
| Red | 4000 ~ 5000 | 275 ~ 344 | ||||||||||
| Green | 5000 ~ 6000 | 344 ~ 413 | ||||||||||
Features
Compact one-piece body design to reduce space.
Low-friction bonnets to increase both accuracy and improve consistency of cracking and reseal pressure.
Lock wire to secure a given pressure setting.
Identifying color-coded springs and labels indicate spring cracking pressure.
Selective and replaceable springs with narrow pressure ranges.
VR3 series - One spring for all set pressure range.
VR6 series - 7 replaceable springs for a variable pressure range.
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