-Aluminium body, poppet and spider.
-Stainless steel spring & high-tensile steel shaft.
-Viton product seal.
-Brass drain plugs and over pressure valve.
Opening pressure in flow direction
45 kPa (6.5 PSI).
Over pressure in non-flow direction
30 kPa (4.5 PSI) (emergency relief in reverse direction to allow for thermal expansion).