高压铜阀当工作压力超过25公斤/公分~2时,不宜用一般的锡青铜来铸造,因为锡青铜的结晶间隔大,具有分散性收缩的特征,不能承受很高的压力,如果错用了便会造成大量漏水而变为废品,即使用热处理也无法挽救.对于需承受工作压力40~l00公斤/公分的铜阀,必须采用结晶间隔较小、强度较 High-pressure copper valve When the working pressure exceeds 25 kg / cm ~ 2, it is not appropriate to use the general tin bronze to cast, because the bronze crystallization interval, with the characteristics of dispersion shrinkage, can not withstand high pressure, if used wrongly It will cause a lot of water leakage and become waste, even if the heat treatment can not be saved.For the work pressure to be subjected to 40 ~ l00 kg / cm of copper valve, the crystallization interval must be smaller, more intense