The Bliss 28 Series Pressure Relief Valve is a robust, code-compliant safety valve designed to protect pressurized systems across industries. Built to ASME Section VIII standards and certified by the National Board, it is available in both conventional and balanced bellows configurations. With options for compressible and incompressible fluid service, the 28 Series offers superior capacity, enhanced flow characteristics, and a wide range of material compatibility—including Monel®, Hastelloy®, and stainless steel trims. Available in sizes from 1" x 2" to 6" x 10", the valve supports a pressure range of 15 psig to over 6000 psig and can operate in extreme temperatures from -450°F to +1000°F. Its modular construction and convertible design make it suitable for replacing legacy valves or adapting to different service conditions with ease.