GB/T 19793-2005 Agricultural irrigation equipment—Hydraulically operated irrigation valves

GB/T 18691.5-2011 Agricultural irrigation equipment—Irrigation valves—Part 5:Control valves

GB/T 17241.1-1998 Synoptic table for cast iron pipe flanges GB/T 17241.1-2024 Cast iron pipe flanges—Part 1:PN designated GB/T 17241.2-1998 Cast iron pipe blank flanges GB/T 17241.2-2024 Cast iron pipe flanges—Part 2:Class designated GB/T 17241.3-1998 Hubbed threaded cast iron pipe flanges GB/T 17241.4-1998 Hubbed slip-on-welding and hubbed socket welding cast iron pipe flanges GB/T 17241.5-1998 Loose hubbed cast iron pipe flanges for lapped pipe end GB/T 17241.6-1998 Integral cast iron pipe flanges GB/T 17241.6-2008 Integral cast iron flanges GB/T 17241.7-1998 Specifications for cast iron pipe flanges GB/T 18689-2002 Agricultural irrigation equipment—Manually operated small plastics valves GB/T 2828.1-2003 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 2828.1-2012 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 7306.1-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads—Part 1:Parallel internal and taper external threads GB/T 18688-2002 Agricultural irrigation equipment—Pressure losses in irrigation valves—Test method GB/T 18688-2012 Agricultural irrigation equipment—Pressure losses in irrigation valves—Test methed GB/T 18688-2023 Agricultural irrigation equipment—Pressure losses in irrigation valves—Test method

ISO 9635:1990