Angular shaped spring loaded safety valves made of spheroidal graphite cast iron (GGG 40.3) with stainless steel spring. Set pressure is protected by seal. Internal parts made of stainless steel. Suitable for the protection of pressure tanks and systems for neutral, non-sticking liquids, provided boiling temperature is not reached under atmospheric pressure. Available two types ; Model 352 F without lifting device, and Model 352 FL with lever for lifting.