The Series 860 is part of the Enardo line of high-performance pressure vacuum relief valves designed with features that exceed the performance of standard valves. Designed for pipe-away applications, it provides protection against positive or vacuum overpressure, prevents air intake and evaporative loss of product, and helps contain odorous, hazardous and potentially explosive vapors. The valve is designed with a spring-loaded pallet which can handle pressure settings of up to 15 psig.