The NuFlo 46038-311A34J-PS HL Safety Relief Valve is a critical overpressure protection device engineered for demanding industrial automation and oil & gas production environments. Manufactured by NuFlo Measurement Systems (with Axelson, Weldbend, and Ray Snubber heritage), this high-performance safety relief valve is set at 74.5 Bar (1080 Psig) and delivers a substantial capacity of 24,373 standard cubic feet of air per minute at set pressure. In process control and pipeline applications where overpressure events can cause catastrophic equipment damage and safety hazards, this safety relief valve provides the dependable protection that operators require.

Safety relief valves represent the final line of defense in any pressurized system's protection strategy. When process upsets, control system failures, or thermal expansion cause pressure to exceed safe operating limits, the NuFlo 46038-311A34J-PS automatically opens to vent excess pressure to a safe location, then reseats when normal pressure conditions are restored. The HL (High-Lift) design provides full-flow capacity at relatively low overpressure, ensuring rapid pressure reduction during emergency conditions. The 1.5x2 inch size and direct-acting operation make this valve suitable for a wide range of pipeline, vessel, and compressor station applications in the oil & gas, petrochemical, and process industries.

Key Features & Specifications

The NuFlo 46038-311A34J-PS HL safety relief valve incorporates proven design elements from multiple respected manufacturers in the pressure control industry. Every component is engineered to perform reliably under the most demanding service conditions.

• Set Pressure: 74.5 Bar (1080 Psig) for high-pressure applications
• Relief Capacity: 24,373 std. cubic ft. air/min at set pressure
• Valve Size: 1.5 x 2 inches with ASME B16.5 flange connections
• Valve Type: HL (High-Lift) for maximum flow capacity
• Operation: Direct-acting (Dir) for reliable response
• Tag Number: PSV-0364B-51 for asset tracking
• Model Reference: 45980-202
• Material Standard: ASME SA105 carbon steel construction
• Pressure Class: 600# inlet / 150# outlet configuration
• Weight: 26.520 kg, robust industrial construction

Technical Specifications

Specification	Details
Part Number	46038-311A34J-PS
Manufacturer	NuFlo Measurement Systems / Axelson / Weldbend
Valve Type	HL Safety Relief Valve
Valve Size	1.5 x 2 inches
Operation Type	Direct-Acting (Dir)
Set Pressure	74.5 Bar / 1080 Psig
Relief Capacity	24,373 std. cubic ft. air/min
Model Number	45980-202
Tag Number	PSV-0364B-51
Material	ASME SA105 Carbon Steel
Inlet Flange Class	600# (ASME B16.5)
Outlet Flange Class	150# (ASME B16.5)
Weight	26.520 kg

Applications & Use Cases

The NuFlo 46038-311A34J-PS HL safety relief valve is engineered for critical overpressure protection in oil and gas production, petrochemical processing, and high-pressure industrial automation systems. Its 74.5 Bar set pressure and substantial 24,373 scfm capacity make it ideal for protecting high-pressure separators, compressor discharge lines, gas gathering systems, and production manifold piping. In upstream oil & gas operations, this valve protects wellhead equipment, flowlines, and production vessels from overpressure events that can occur during well control operations or process upsets.

The valve's ASME SA105 carbon steel construction and 600# flange rating suit it for sour gas and high-pressure hydrocarbon service where material compatibility and pressure containment are paramount. Natural gas pipeline compressor stations, underground gas storage facilities, and gas processing plants all represent typical deployment scenarios. The HL (High-Lift) design ensures that the valve achieves rated flow capacity at minimal overpressure above set point, providing the fastest possible pressure relief during emergency conditions. Offshore platform process systems and FPSO vessels also utilize these valves extensively for protecting high-pressure process equipment in marine environments.

Why Choose the NuFlo 46038-311A34J-PS

NuFlo Measurement Systems has earned a reputation for producing safety relief valves that deliver consistent, reliable performance in the world's most demanding oil and gas production environments. The 46038 series valves combine design heritage from Axelson, Weldbend, and Ray Snubber—each respected names in pressure control equipment—resulting in a product that benefits from decades of field-proven engineering expertise.

The HL high-lift design is a key differentiator for this valve. Unlike conventional safety relief valves that require significant overpressure to achieve full lift, the HL design provides rapid opening to full capacity. This characteristic is critical in applications where pressure rise rates can be steep and immediate relief capacity is essential to prevent equipment damage. The direct-acting operation eliminates the complexity of pilot-operated designs, reducing maintenance requirements and improving reliability in applications where valve response time is critical.

Sourcing this valve from Auto2mation provides the additional assurance of our comprehensive inspection and testing program. Every refurbished valve in our inventory undergoes functional testing to verify set pressure accuracy and seat tightness. Our 30-day warranty and free shipping ensure that you receive a quality product delivered to your facility with full confidence in its operational readiness.

Compatibility & Integration

The NuFlo 46038-311A34J-PS HL safety relief valve is designed for straightforward integration into existing piping systems. The 1.5-inch inlet and 2-inch outlet with ASME B16.5 flange dimensions ensure compatibility with standard piping components. The 600# inlet rating provides adequate pressure containment for high-pressure applications, while the 150# outlet allows connection to vent headers or flare systems operating at lower pressure. When integrating this valve into your system, ensure that the vent piping is adequately sized to handle the valve's rated capacity without creating excessive backpressure that could affect set pressure accuracy.

For process control integration, the PSV-0364B-51 tag number facilitates asset management and documentation in your facility's maintenance management system. The valve should be installed with isolation valves (where permitted by codes) and a bypass arrangement to allow for testing and maintenance without process shutdown. Auto2mation can provide guidance on proper installation practices and compliance with applicable pressure vessel codes and standards, including ASME Boiler and Pressure Vessel Code requirements.

Maintenance & Support

Proper maintenance of safety relief valves is essential to ensure they function correctly when called upon to protect your process equipment. Industry best practices recommend periodic testing of set pressure and verification of seat tightness at intervals defined by applicable codes and the severity of service conditions. The direct-acting design of the NuFlo 46038-311A34J-PS simplifies maintenance compared to pilot-operated alternatives, with fewer internal components requiring inspection and service.

Auto2mation supports the products we sell with technical expertise and responsive customer service. Our team can assist with installation questions, maintenance scheduling recommendations, and troubleshooting. For valves requiring recertification or repair, we can coordinate with authorized service facilities. Every refurbished valve we supply has been tested to verify proper operation, and our 30-day warranty provides protection against defects. Our free shipping policy extends worldwide, ensuring prompt delivery to your facility regardless of location.

Frequently Asked Questions

Q1: What does "HL" designation mean for this safety relief valve?

HL stands for "High-Lift," indicating a design that achieves full open position and rated flow capacity at relatively low overpressure above the set pressure. This provides faster pressure relief compared to conventional designs, which is critical for protecting equipment from rapid pressure transients.

Q2: What is the significance of the 74.5 Bar set pressure?

The 74.5 Bar (1080 Psig) set pressure indicates the pressure at which this valve begins to open. This high-pressure rating makes the valve suitable for protecting high-pressure separators, compressor discharge systems, and production equipment in oil and gas applications where operating pressures are substantial.

Q3: Is this valve suitable for sour gas service?

The ASME SA105 carbon steel construction is suitable for many hydrocarbon services. For sour gas (H2S-containing) applications, material compatibility should be verified against NACE MR0175/ISO 15156 requirements. Auto2mation can provide material certification documentation to support this evaluation.

Q4: What does "refurbished" condition mean for this valve?

Refurbished means the valve has been professionally inspected, cleaned, and tested to verify proper operation. Seals and soft goods are replaced as needed, and the valve is functionally tested to confirm set pressure accuracy and seat tightness. Our refurbished valves come with a 30-day warranty.

Q5: What certification standards does this valve meet?

This valve is constructed to ASME B16.5 flange standards with SA105 material certification. It is suitable for installation on ASME-stamped pressure vessels and piping systems. Auto2mation can provide material certifications and documentation to support your compliance requirements.

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