Are electric insulation ball valves generally manual or electric? 1. The body and gland of the electric ball valve for the tap water pipe are of integral casting structure, cast with resin sand, made of ductile iron GGG50, which meets the requirements of DIN1693, with strength greater than 500MPa and elongation greater than 10. It is higher than QT400-10, with higher strength and corrosion resistance. When bearing the maximum pressure difference of the pipeline, the stress does not exceed 1/5 of the tensile strength of the material;
2. All valve seals are made of NBR, and the valve raw materials are from Bayer, Germany. All sanitary, mechanical, physical and corrosion resistance indicators meet the requirements of German DVGW, so as to ensure that the service life of the valve gate is 35 years under normal conditions. The valve has excellent wear resistance, resilience, cavitation resistance, aging resistance and acid and alkaline resistance;
3. The limit expansion pipe is Q235-A;
4. Fasteners shall be Q235-A with galvanized surface.
5. The surface of all nodular cast iron castings is electrostatically sprayed with epoxy resin coating, the color code is RAL5012, the coating thickness is 0.2~0.5mm, and no iron is exposed. The epoxy resin powder is the product of 3M Company in the United States, and the epoxy resin coating complies with DIN30667.
