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Vent Relief Valve High Pressure


1/8" - 1/4" NPT
150 - 600 Psig

Description

A compact, highly accurate, direct acting pressure relief valve. Factory preset to desired crack pressure and/or flow specifications. Internal adjustment provides tamper proof safety against inadvertent pressure changes. Available in vent to atmosphere or inline configurations. Valves feature an encapsulated O-ring seal to prevent extrusion at higher differential pressures.

Features and Benefits

  • Accurate and Repeatable Cracking Pressure
  • 100% Factory Preset and Tested
  • Zero Leakage to 95 - 98% of Set Pressure
  • Tamper Proof Adjustment
  • Excellent Reseal Performance
  • Compact Size

Technical Data

  • Set Pressure Range: 150 to 600 Psig (10.3 to 42 bar)
  • Inline Valves (Series VRVHI):
    • Proof Pressure: 750 Psig (52 bar)
    • Burst Pressure: >1000 Psig (69 bar)
  • Set Pressure Tolerance: Factory preset +/- 5% on increasing pressure
  • Reseal: 90% of Set Pressure
  • Temperature Range: -320°F to 350°F(-195°C to 177°C)
    Based on seal selection, see ordering information

Materials of Constructions

Component Material
Valve Body, Stem, O-Ring Cup Brass, ASTM B16
Spring Retainer 316 SS, ASTM A479
Seal1 As specified, see ordering information
Spring 302 SS/17-7 PH, ASTM A313
Locknut 18-8 SS
1 Lubricated with KrytoxTM

Dimensional Data


Pipe Size NPT VRVH VRVHI
A Hex A Hex
1/8" 0.94 1/2" 1.44 1/2"
1/4" 1.29 5/8" 1.75 3/4"
Dimensional data is stated in inches

Flow Data, Series VRVH (Vent to Atmosphere)

Nominal Spring 150 250 500
Set Pressure Range (Psig) 125 - 175 175 - 350 350 - 600
Valve Size Orifice Flow (SCFM) Kd Flow (SCFM) Kd Flow (SCFM) Kd
1/8" NPT (VRVH - 125) 0.156 7.5 0.12 12.5 0.12 33 0.16
1/4" NPT (VRVH - 250) 0.293 50 0.22 90 0.24 150 0.21

Flow Data, Series VRVHI (Inline)

Nominal Spring 150 250 500
Set Pressure Range (Psig) 125 - 175 175 - 350 350 - 600
Valve Size Orifice Flow (SCFM) Kd Flow (SCFM) Kd Flow (SCFM) Kd
1/8" NPT (VRVHI - 125) 0.156 12 0.18 13.5 0.13 35 0.17
1/4" NPT (VRVHI - 250) 0.250 45 0.27 80 0.30 175 0.33

Ordering Information

VRVH Ordering Info

PROPER COMPONENT SELECTION - When specifying a component, the total system design must be considered to ensure safe and trouble-free performance. Intended component function, materials compatibility, pressure ratings, installation, environment and maintenance are the responsibility of the system designer.

For Instructions on How to Select Your Model, click here.

Vent Relief Valve High Pressure (Vent to Atmosphere)
ModelSizeFile TypeDownload
VRVH-125B1/8" NPTSTEP Download
VRVH-250B1/4" NPTSTEP Download

Vent Relief Valve High Pressure (Inline)
ModelSizeFile TypeDownload
VRVHI-125B1/8" NPTSTEP Download
VRVHI-250B1/4" NPTSTEP Download