This type of pressure relief valve (PRV) is typically installed on tanks fabricated by OEMs, who provide them to end users, engineering firms or contractor customers. The new valve is certified under UL132 and American Society of Mechanical Engineers (ASME) Section VIII.
With a pre-installed national pipe tapered thread standard 2-inch male hex nipple, this new product serves the need for a solution with a 2-inch connection that provides the same benefit as traditional multi-ported valves, but with simplified installation and maintenance. For this application, the PRV must be connected to the tank, with no isolation valve between the tank and the PRV. This National Fire Protection Association 58 code requirement presents challenges when testing the PRV while the tank is pressurised and in operation.
The Fisher 63EGLP-16 Pilot Operated Relief Valve addresses this and other issues because it is designed specifically for this type of service. Operation is implemented with a dual pilot array, providing redundancy, and allowing for removal of one pilot for testing while the other is operational.
Reliable operation over a long lifecycle is needed. This requirement is met by the 2-inch PRV because it is similar in design to the Fisher 63EGLP 4-inch CL300 model, which has been proven in use over the past 10 years.