Expansion Relief Valves are used on AST piping for relief of excess pressure caused by thermal expansion of liquid. The Valve allows product to return back to the storage tank.

076DI...Specify 25 or 50 PSI. Primarily for use with line leak detection systems. Use Fig. 76DI anytime you need to maintain precise pressures in the piping system.

078DI...Specify 25, 40 or 100 PSI. Pressure settings are approximate.