The Anderson Greenwood Type 84 Pressure Relief Valve (PRV) is designed to protect tanks and vessels used in hydrogen and other high-pressure gas applications. It features Arlon 3000XT thermoplastic seating and ASME SA-479 Type S21800 stainless steel spindle material. 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 cartridge assembly is designed to apply uniform spring pressure, and is factory tested with helium and nitrogen. Anderson Greenwood Type 84 valves comply with ASME Section VIII and XIII, NB certification and API 527.