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Introduction to the Anderson Greenwood Type 84 Pressure Relief Valve

Emerson has recently unveiled its latest innovation, the Anderson Greenwood Type 84 Pressure Relief Valve (PRV). This advanced valve is specifically engineered to provide robust protection for tanks and vessels utilized in hydrogen and other high-pressure gas applications. With a construction that incorporates Arlon 3000XT thermoplastic seating and ASME SA-479 Type S21800 stainless-steel spindle material, the Type 84 PRV offers exceptional leak-tight performance, resistance to embrittlement, optimal seat tightness, and enduring reliability, ensuring a prolonged service life.

The Challenges with Traditional Pressure Relief Valves

Pressure relief valves are commonly employed in a variety of traditional applications; however, many of these valves have limitations when it comes to handling extremely small molecules under very high pressures. This is particularly relevant for hydrogen gas, which is known to diffuse into metals. Such diffusion can lead to embrittlement of the PRV internals, significantly increasing the risk of leaks, failures, and associated safety concerns. The need for a specialized solution to mitigate these risks has become increasingly critical in industries utilizing hydrogen and other high-pressure gases.

Design and Performance Specifications

To tackle the challenges associated with high-pressure gas applications, the Type 84 PRV is meticulously designed to operate within a pressure range of 6,000 psig (413 barg) to 20,000 psig (1,379 barg) specifically for hydrogen (H2) and helium (He), and a range of 6,000 psig (413 barg) to 21,756 psig (1,500 barg) for all other gases. One of the key features of this valve is its ability to reach full lift at less than 5% overpressure, thereby providing effective protection to the vessels or tanks to which it is attached. Remarkably, the Type 84 PRV demonstrates no leakage at 90% of the set pressure, ensuring optimal safety and functionality.

Innovative Cartridge Assembly Design

The Type 84 valve incorporates a sophisticated cartridge assembly design that applies uniform spring pressure. This innovative feature results in secure seat sealing, leading to exceptional leak-tight performance. Furthermore, the valve undergoes rigorous factory testing with helium and nitrogen, both of which are widely accepted within the industry as substitutes for hydrogen. This thorough testing process ensures that the Type 84 PRV meets the stringent performance standards required for high-pressure applications.

Compliance with Industry Standards

Safety and performance are paramount in the design of the Anderson Greenwood Type 84 valve. It complies with a range of industry standards, including the American Society of Mechanical Engineers (ASME) Sections VIII and XIII, as well as the National Board of Boiler and Pressure Vessel Inspectors (NB) certification. Additionally, it adheres to the American Petroleum Institute (API) 527 standards, further establishing its credibility and reliability in critical applications.

Conclusion

In summary, the Anderson Greenwood Type 84 Pressure Relief Valve from Emerson is a game-changer for industries dealing with hydrogen and other high-pressure gases. Its advanced design, superior materials, and rigorous testing protocols ensure that it stands up to the challenges posed by such demanding applications. For more information about the Type 84 PRV and its specifications, please visit Emerson’s official website.

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