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Status : Active
Standard Type : Main
Document No : ISO 9635-4:2014
Document Year : 2014
Pages : 14
Edition : 2
Section Volume : Irrigation and drainage equipment and systems (ISO/TC 23/SC 18.)
It is applicable to hydraulically operated air irrigation valves of DN 15 diameter or greater, designed to be directly operated, i.e. the force is applied to the obturator by the float, either directly or via a mechanical linkage. The valves can be operated by a force applied through an adjustable pilot valve.