底阀本阀安装在水泵吸水管路的底端，能自动阻止流体倒流。一、性能规范型号公称压力试验压力工作温度℃适用介质强度（水）MPa密封（水）MPaH42X-2.50.250.40.25≤50水二、主要零件材料零件名称材料阀体、阀盖、阀瓣灰铸铁密封圈橡胶垫片石棉板三、外形尺寸和连接尺寸型号公称通径DN（mm）尺寸（mm）重量（kg）DD1D2b-fZ-ΦdD0h0HH42X-2.5501401109016-34-141351714246516013011016-34-14168251806.58018515012518-34-18198321978.510020517014518-34-1824740230143.5125235250017520-38-18272432701815026022520020-38-18315382972420031528025522-38-18405653823825037033531024-312-18