Pressure Relief Valve.

Deliver leak-tight service at very high pressures for hydrogen storage, transport and refuelling stations.

The Anderson Greenwood Type 84 Pressure Relief Valve (PRV) has been introduced by Emerson. This is specially designed to protect tanks and vessels used in hydrogen and other high-pressure gas applications. With Arlon® 3000XT thermoplastic seating and ASME SA-479 Type S21800 stainless steel spindle material, the Type 84 PRV delivers exceptional leak-tight performance, resistance to embrittlement, optimum seat tightness, high reliability and long service life.

PRVs are frequently used in traditional applications, but they are not designed to handle extremely small molecules at very high pressures. Therefore, they are not ideal for hydrogen gas, which can diffuse into metals and cause embrittlement of PRV internals, increasing the risk of leaks, failures and safety problems.

To address these and other issues, Type 84 PRVs are constructed for high-pressure gas applications, with a range of 6,000 pounds per square inch gauge (413 bar gauge) to 20,000 psig (1,379 barg) for H2 and He, and a range of 6,000 psig (413 barg) to 21,756 psig (1,500 barg) for all other gases. It reaches full lift at less than 5% overpressure to protect the vessel or tank to which they are affixed, with zero leakage at 90% of set pressure. The valves feature a unique cartridge assembly design to apply uniform spring pressure, resulting in secure seat sealing and leak-tight performance. They are factory tested with helium and nitrogen, both accepted industry-wide as a substitute for hydrogen.

Anderson Greenwood Type 84 valves comply with key industry standards for safety and performance, including American Society of Mechanical Engineers (ASME) Section VIII and XIII, National Board of Boiler and Pressure Vessel Inspectors (NB) certification, and American Petroleum Institute (API) 527.

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150 Years of overpressure protection and valve innovation.

Crosby pressure relief valves continue tp deliver reliable overpressure protection across a wide range of critical applications.

Recent valve innovation milestones include: 2019 – PRV monitoring and RFID technologies are released for the Crosby J-Series. 2020 – Actuated J-Series valves attain SIL3 (Safety Integrity Level 3) certification. 2022 – Emerson introduces Crosby Balanced Diaphragm Technology. 2022 – Emerson introduces Bellows Leak Detection for Crosby valves. 2024 – Crosby H-Series limits are extended to over 7,250 pounds per square inch/500 bar and 1,200 degrees F/648 degrees C.

Emerson recognises the 150th anniversary of its Crosby™ line of pressure relief valves (PRVs), marking a significant milestone in the history of PRVs and overpressure protection products. Crosby technologies are field-proven and engineered to meet the latest regulatory standards with improved performance, greater reliability, and enhanced safety.

“Emerson remains committed to innovation and excellence, continuously enhancing its range of overpressure products to meet and exceed the evolving needs of end users,” said Judson Duncan, the president of Emerson’s pressure management business. “With a steadfast dedication to regulatory compliance, safety, and customer satisfaction, Crosby is positioned to lead a safer, more sustainable industry over the next 150 years.”

Current Crosby offerings include:

• J-Series – Robust and proven technology providing reliable overpressure protection in various applications, including air, gas, steam, vapor, liquid and two-phase media. Used extensively in the oil and gas, refining, and chemical industries.
• OMNI-TRIM® – Proven solution for overpressure protection and thermal relief applications in air, gas, vapor, liquid, and steam applications. A straightforward design makes it ideal for refineries, chemical and petrochemical plants, power plant auxiliary systems, and pulp and paper mills.
• H-Series – High performance PRVs for overpressure protection in power industry steam safety applications, including economizers, steam drums, superheaters, reheaters and more.

The company is continuously developing new valve technologies based on their deep experience in critical service applications. For example, Crosby Balanced Diaphragm technology eliminates bellows in PRVs, ensuring reliable, balanced operation against backpressure. This innovation reduces maintenance costs, improves performance, and enhances safety with its robust design. In a related development, the world’s first Bellows Leak Detection solution provides instant notification of ruptures to enable prompt maintenance, reduce fugitive emissions, and provide event logging for intelligent root cause failure analysis—enhancing productivity and environmental protection.

All these overpressure protection products are field-proven technologies, engineered to meet the latest user demands.

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