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VR
Relief Valve

Category

  • Instruments | Valve | Relief Valve
  • Dimensions
  • How To Order
  • Specifications
  • Features

Dimensions


 

Part No.End  ConnectionsDimensions (mm)
InletOutletOrificeLhH
VR3
or
VR6
U-04T-1/4" UNILOKVR3 :
4.8
 
VR6 :
3.5
39.639.6109.5
U-06T-3/8" UNILOK43.843.8113.7
U-08T-1/2" UNILOK46.546.5116.5
U-M06T-6mm UNILOK39.639.6109.5
U-M08T-8mm UNILOK
U-M12T-12mm UNILOK46.646.6116.5
MF-04N-1/4" Male NPT1/4" Female NPT32.532.5102.4
MF-06N-3/8" Male NPT3/8" Female NPT34.5
MF-08N-1/2" Male NPT1/2" Female NPT38.036.5106.4
MU-08N08T-1/2" Male NPT1/2" UNILOK46.5
MU-08NM12T-1/2" Male NPT12mm 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.


VR3MU-08N08T-SS- 
UNILOK
Valve
Valve
Type
Connection
Type
Connection
Size
Body
Materials
Spring
Type
Valve TypeConnection SizeSpring Type
R3Low Pressure, 300psigFractional(Inch) Tube O.D. DesignationDesignatorColorCracking
Pressure
(psig)
R6High Pressure, 6000psigTube
O.D.
inch1/43/81/2
mm6.359.5212.70YYellow350 ~ 750
Connection TypeDesignator04T06T08TPPurple750 ~ 1500
UUNILOK Tube FittingOOrange1500 ~ 2250
FFemale NPT or ISO7/1(PT)Metric Tube O.D. DesignationBBrown2250 ~ 3000
MMale NPT or ISO7/1(PT)Tube O.D.mm6812WWhite3000 ~ 4000
DesignatorM06TM08TM12TRRed4000 ~ 5000
GGreen5000 ~ 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 Size1/43/81/2
Designator04N/R06N/R08N/R

Specifications

SpecificationReseal PressureSpring Color Coding and Cracking Pressure Range
SpecificationVR3 seriesVR6 Series0.3ptTest Set PressureMinimum Resealing
Pressure (%)
SeriesColorCracking Pressure Range
Maxium
Working
Pressure
300 psig
20.6 bar
6000 psig
413 bar
psigbarpsigbar
VR310 ~ 200.7 ~ 1.350VR3Yellow10 ~ 2500.7 ~ 18
Temperature
Range
-23 ~ 204
-10 ~ 400
175 ~ 22512.0 ~ 15.590VR6Yellow225 ~ 75015.5 ~ 52
VR6100 ~ 2006.8 ~ 13.750Purple750 ~ 150052 ~ 103
Cracking
Pressure
Range
10~250 psig
0.7~18 bar
350~6000
psig
25~413 bar
850 ~ 100058.5 ~ 68.984Orange1500 ~ 2250103 ~ 155
Minimum Resealing Pressure - As a percentage of test set pressureBrown2250 ~ 3000155 ~ 206
White3000 ~ 4000206 ~ 275
Red4000 ~ 5000275 ~ 344
Green5000 ~ 6000344 ~ 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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