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SZ43Y SZ63Y SZ83Y油田专用阀门 |
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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 |
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