Industrial Relief Valve 10-750 PSI

Key Features

• Factory preset and tamper-resistant
• 100% factory tested for leakage, crack, and reseal
• High flow capacity with excellent resealing
• Offered in NPT, face seal, and Bi-Lok tube connections
• Optional deflector cap for atmospheric exhaust
• Compact design, ideal for tight installations
• Oxygen-cleaned version available

Models

• IRV – Vent to Atmosphere
• IRVD – With Deflector Cap
• IRV4, IRV6, IRV8 – Inline FNPT adapters (1/4”, 3/8”, 1/2”)
• IRV4T, IRV8T – Bi-Lok Tube Inline Adapters
• IRV4V, IRV8V – Metal-to-metal Face Seal Inline Adapters

Connections

Inlet sizes

1/4” and 1/2” NPT Male

Optional

Bi-Lok dual ferrule tube and face seal

• Threads per ANSI/ASME B1.20.1
• Compact inline adapters available

Pressure Ranges

FKM seal

10–750 PSIG (0.69–51.7 Bar)

PTFE seal

50–750 PSIG (3.45–51.7 Bar)

Set Pressure Tolerance

±5%

Reseat

90% (FKM), 80% (PTFE) of set pressure

• Full flow at 110% of set pressure
• Zero leakage up to 95% of set pressure
• Not affected by up to 10% backpressure

Temperature Range

• −60°F to +375°F (−51°C to +190°C), depending on seal material

Materials

Body, poppet, seat, and adapter

316SS

Spring

302SS or 17-7PH stainless steel

Lubricant

Krytox™

• Face seal components electro-polished to 10 Ra Max

Seal Material Options

• FKM seal (−10°F to 375°F / −23°C to 190°C)
• PTFE seal (−60°F to 375°F / −51°C to 190°C)

Flow Capacity

Orifice sizes

0.180", 0.312", 0.400"

• Flow coefficients vary by orifice and pressure – consult factory