BS ISO 9644:2018仅适用于手动启动的阀门。本文件规定了测定农业灌溉压力损失的试验方法 当水流过阀门时，阀门处于稳定状态。报告的范围和准确性 本文介绍的阀门性能规范将有助于农业灌溉系统设计师 比较不同类型阀门的压力损失。交叉参考:EN 1267:2012 ISO/IEC指南98-3购买本文件时，所有现行修订版均包含在购买本文件中。

BS ISO 9644:2018 applies to manually-activated valves only.This document specifies a test method for determining the pressure loss in agricultural irrigation valves under steady-state conditions when water flows through them. The scope and accuracy of the valve performance specifications presented will assist agricultural irrigation system designers in comparing pressure losses through various types of valves.Cross References:EN 1267:2012ISO/IEC Guide 98-3All current amendments available at time of purchase are included with the purchase of this document.