产品引用标准: JB/T5198-91管线用钢制平板闸阀 Steel parallel plate valve for pipeline ANSI B16.5a-1992管法兰管件 Pipe flanges and flange pipes GB/T13927-92通用阀门压力试验 Pressure test for universal valves JB/T9092-1999阀门的检验与试验 Valve inspection and testing JB/TQ814-89钢制平板闸阀产品阀产品质量分等 Steel parallel plate valve products quality grades ranks |