Steel flange valve 30s541nzh is a high-quality pipeline fitting, the main distinguishing feature of which is the locking element, which moves perpendicular to the working flow. Water, steam, oil, oil, natural gas, liquid non-aggressive petroleum products, non-aggressive liquid and gaseous media, in relation to which the materials used in the valve are corrosion-resistant - the main purpose of the presented device. It is able to function normally at a pressure not exceeding 16 bar and a temperature not exceeding 550 °C.