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
45kPa (6.5 PSI)
Over pressure in non-flow direction
30kPa (4.5 PSI) (emergency relief in reverse direction to allow for thermal expansion).
4.0 kg (8.8lb)