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一、前言本文系对用球墨铸铁制造闸阀的可能性所做的试验研究报告,其管路直径为200至400毫米,公称压力达40公斤/厘米~2。公称压力达40公斤/厘米~2的球墨铸铁中压闸阀在专业书籍中介绍的只有公称通径为40至150毫米的,较大直径的闸阀目前还没有报导,有关这方面的计算和试验结果也没有见过。低压工业阀门一般用灰铸铁制造,高压阀门的铸件一般用铸钢制造。根据球墨铸铁
I. INTRODUCTION This paper is a pilot study on the possibility of making gate valves made of nodular cast iron with pipe diameters of 200 to 400 mm and nominal pressures of 40 kg / cm ~ 2. Nodular cast iron medium pressure gate valves with a nominal pressure of up to 40 kg / cm 2 have only been reported in professional books. Larger diameter gate valves with nominal diameters of 40 to 150 mm have not been reported yet. The calculations and test results in this respect Never seen it Low-pressure industrial valves are generally made of gray cast iron, high-pressure valve castings are generally made of cast steel. According to ductile iron