Relief Valves
Safety Relief Valve
Asme-Certified Overpressure Protection
Safety relief valve designed for overpressure protection in gas and liquid service applications. Built to ASME and National Board standards for reliable performance across a wide range of operating conditions. Features corrosion-resistant internals and certified construction for dependable pressure relief in production systems.
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Highlights
- ASME Section XIII and National Board coded; UV and NB stamped; flow capacities independently certified
- Valve sizes 1″ and 2″; inlet connections 1/2″ through 2″ MNPT; outlet FNPT; gas and liquid service configurations
- Orifice sizes C (0.295″), D (0.400″), E (0.534″), F (0.672″), and G (0.857″); spring ranges from 15 PSIG up to 2500 PSIG
- Soft seat trim with Viton seal material; corrosion-resistant stainless steel internals
- CS (WCB) bonnet and CS (A105) seat frame standard; NACE construction option available
- Gauge port option available; flow coefficient k = 0.850 (gas) and 0.591 (liquid)
- Weights: 7.5 lbs (1″ valve) and 18 lbs (2″ valve)
Application
- Separators, pressure vessels, and heater-treaters requiring certified overpressure protection
- Compressors, gathering lines, transmission lines, and meter runs in oil and gas service
- Low- and high-pressure gas and liquid applications requiring ASME-coded relief devices
- Installations requiring NACE MR0175-compliant construction for corrosive service environments
High Capacity Relief Valve
High Flow Overpressure Protection
High capacity relief valve designed to protect systems from overpressure in gas and instrument air applications. Provides reliable, preset pressure relief in a compact and durable design. Ideal for applications requiring simple, dependable overpressure protection.
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Highlights
- Factory-preset set pressures from 50 to 150 PSIG in 3/4″ and 1″ NPT sizes
- Set pressure tolerance ±5%; reseals at 92% of set pressure
- CDA360 brass body and 302 stainless steel spring for corrosion resistance
- Nitrile seal for reliable seating across a broad service range
- Simple, compact design for straightforward installation and long service life
- Available in seven preset pressure configurations per pipe size
- Suitable for natural gas and compressed air service
Application
- Overpressure protection on natural gas service regulators and appliances
- Instrument air supply protection on pneumatic control systems
- Low-pressure gas distribution system overpressure protection
- Compact relief service where adjustable set pressure is not required
Pneumatic Relief Valve
Instrument / Air System Protection
Pneumatic relief valve designed to protect instruments from overpressure conditions. Provides reliable, preset protection with consistent activation at a defined limit. Ideal for safeguarding sensitive pneumatic systems.
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Highlights
- Factory preset from 2 to 50 PSIG for instrument supply protection
- Large 0.344″ relief seat diameter for high relief flow capacity
- Rolling diaphragm design for enhanced accuracy and sensitivity
- Tamper-resistant spring case prevents unauthorized adjustment
- 1/4″ NPT inlet and outlet ports; 1/2″ NPT tapped vent
- Lightweight at 0.56 lbs for easy inline installation
- Temperature range -29°F to 150°F (-29°C to 66°C)
Application
- Instrument air supply overpressure protection on pneumatic control systems
- Limiting supply pressure to pneumatic instruments in case of supply regulator failure
- Inline overpressure protection on instrument tubing and pneumatic signal lines
- Field instrument protection on oil and gas production and processing facilities