给水用硬聚氯乙烯(PVC-U)阀门
Valves made of unplasticized poly(vinyl chloride) (PVC-U) for water supply [ISO 4422-4:1997,Pipes and fittings made of unplasticized poly(vinyl chloride)(PVC-U)for water supply-SpecificationsPart 4: Valves and ancillary equipment,MOD]
