过流部件 Aluminium, Stainless Steel 可选阀座材质 Acetal, Polypropylene, Stainless Steel, Kynar 可选球阀材料 Buna-N, Santoprene, Stainless Steel, Hytrel, PTFE, Viton 可选膜片材质 Buna-N, Viton, PTFE, PTFE overmold, Hytrel, Santoprene 泵体中心部分 Polypropylene