Compact Precision Vent Relief Valve

Key Features

• Direct-acting design
• Factory preset – tamper-resistant
• Excellent resealing performance
• 100% factory tested (leak, crack, reseat)
• Compact and installation-friendly
• Vent or inline outlet configurations

Models

• VRVH – Vent to Atmosphere
• VRVHI – Inline Pipe-A-Way

Connections

Inlet

1/8” or 1/4” NPT

Thread standard

ANSI/ASME B1.20.1

• Custom connections available

Pressure Ranges

Set Pressure

150–600 PSIG

Set Tolerance

±5%

Reseat Pressure

Elastomeric seal

90%

PTFE seal

80%

Operating Pressure

up to 750 PSIG

Burst Pressure

>1000 PSIG

Temperature Range

• −320°F to +350°F (−195°C to +177°C depending on seal)

Materials

Body

Brass ASTM B16

Spring Retainer

316SS

Spring

302SS or 17-7PH

Lubricant

Krytox™

Seal Material Options

• Viton™ seal (−10°F to 375°F / −23°C to 190°C)
• Buna-N seal (−40°F to 250°F / −40°C to 121°C)
• Neoprene seal (−40°F to 300°F / −40°C to 148°C)
• EPDM seal (−65°F to 300°F / −54°C to 148°C)
• Silicone seal (−70°F to 450°F / −56°C to 232°C)
• PTFE seal (−320°F to 350°F / −195°C to 176°C)
• PTFE seal may not reseal bubble-tight

Flow Capacity (SCFM)

• 1/8” NPT – up to 33
• 1/4” NPT – up to 150
• Inline 1/4” – up to 175