Standard No.:	GB/T 18691.3-2011
English Name:	Agricultural irrigation equipment—Irrigation valves—Part 3:Check valves
Chinese Name:	农业灌溉设备 灌溉阀 第3部分：止回阀
Chinese Classification:	B91    Farming machinery and tools
Professional Classification:	GB    National Standard
ICS Classification:	65.060.35 65.060.35    Irrigation and drainage equipment 65.060.35
Issued by:	AQSIQ;SAC
Issued on:	2011-5-12
Implemented on:	2011-10-1
Status:	superseded
Superseded by:	GB/T 18691.3-2021 Agricultural irrigation equipment—Irrigation valves—Part 3: Check valves
Superseded on:	2022-7-1
Superseding:	GB/T 18691-2002 Agricultural irrigation equipment--Check valves
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	160.00
Delivery:	via email in 1~3 business day

本部分规定了止回阀的设计要求、性能要求、一致性评定、标志和包装。
本部分适用于水温不超过60 ℃，并且水中可能含有某些农业常用类型和浓度的肥料或化学物质的灌溉系统。
本部分适用于公称尺寸不小于DN 15的液力驱动式灌溉止回阀。该止回阀的设计工作状态为全开和全关，但也可在任意中间状态长时间工作。