Standard No.:	GB/T 18691.4-2011
English Name:	Agricultural irrigation equipment—Irrigation valves—Part 4:Air valves
Chinese Name:	农业灌溉设备 灌溉阀 第4部分：进排气阀
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
Source Content Issued by:	AQSIQ;SAC
Issued on:	2011-5-12
Implemented on:	2011-10-1
Status:	superseded
Superseded by:	GB/T 18691.4-2021 Agricultural irrigation equipment—Irrigation valves—Part 4: Air valves
Superseded on:	2022-7-1
Superseding:	GB/T 18693-2002 Agricultural irrigation equipment--Float type air release valves
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1~3 business day

本部分规定了进排气阀的设计要求、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的液力驱动式灌溉用进排气阀，该类阀或直接通过浮子给启闭件施加力实现运行或由机械式控杆通过浮子给启闭件施加力实现运行。该类阀也可通过可调先导阀施加力实现运行。