Emerson Electric Company, a multinational corporation headquartered in Ferguson, Missouri, has introduced the Anderson Greenwood Type 84 Pressure Relief Valve (PRV), designed specifically to protect tanks and containers in hydrogen and other high-pressure gas applications. They are designed to provide exceptional, leak-tight service, resistance to embrittlement, optimum seat tightness, high reliability and long service life.

PRVs are commonly used in traditional applications, but they are not originally designed to handle extremely small molecules at very high pressures. They are therefore not the first choice for hydrogen gas, as it can diffuse into metals and embrittle the internal components of the PRV. This in turn increases the risk of leaks, failures and safety issues.

To solve these and other problems, the new PRV Type 84 is designed for high-pressure gas applications in a pressure range of 413 to 1,379 barg (6,000 to 20,000 psig) for hydrogen and helium, and a pressure range of 413 to 1,500 barg (6,000 to 21,756 psig) for all other gases. They achieve full lift at less than five percent overpressure to protect the vessel or tank to which they are attached, without leaking at 90 percent of set pressure.

The Type 84 features a unique cartridge assembly that maintains consistent spring pressure, ensuring a reliable seal on the valve seat and leak-free operation. They are factory tested with helium and nitrogen, both of which are industry-accepted hydrogen substitutes.

The Anderson Greenwood Type 84 valves comply with the most important industry standards for safety and performance, including those of the American Society of Mechanical Engineers (ASME) Sections VIII and XIII, and have been certified by the National Board of Boiler and Pressure Vessel Inspectors (NB) and the American Petroleum Institute (API) 527.

Video