One, Y42X air valve overview of the company's Y410X, Y416, Y425 type spring piston valve is suitable for operating temperatures of water, air and non-corrosive liquids pipeline 0-90oC of. In high-rise buildings and cold water supply and fire protection water supply system, can replace conventional partition pipe, simplifying and saving equipment systems, reducing the project cost. The product ratio increased by Hu diaphragm life three times. Two, Y42X air valve main parts and materials Part Name Material Body, cover, under cover of gray cast iron, cast steel piston adjusting spring silico-manganese stainless steel liner