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    Home    >    Products    >    Relief Valves    >    Vent Relief Valve High Pressure

Vent Relief Valve High Pressure



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1/8" and 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.

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Features and Benefits

  • Accurate and Repeatable Cracking Pressure
  • 100% Factory Preset and Tested
  • Zero Leakage to 95 - 98% of Set Press
  • 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 GPL 202

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 states in inches n 12.05.01

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
Notes to Flow Data
• Flow and Kd (discharge Coefficient) are stated at 110% accumulation above set point with Nitrogen and Zero Downstream Pressure
• Interpolate charts for set pressures between points given
• Restrictions in the inlet or outlet piping may reduce flow
• Exceeding 115% accumulation may result in valve failure
• Generant offers complete design assistance. Consult factory for correct relief valve sizing
• Individual flow curves available on request
• Orifice sizes are stated in inches

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
Notes to Flow Data
• Flow and Kd (discharge Coefficient) are stated at 110% accumulation above set point with Nitrogen and Zero Downstream Pressure
• Interpolate charts for set pressures between points given
• Restrictions in the inlet or outlet piping may reduce flow
• Exceeding 115% accumulation may result in valve failure
• Generant offers complete design assistance. Consult factory for correct relief valve sizing
• Individual flow curves available on request
• Orifice sizes are stated in inches

Ordering Information

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.