This part of ISO 9635 specifies construction and performance requirements and test methods for air valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulically operated air irrigation valves of DN 15 (1/2 inch) 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.
BS ISO 9635-4:2006 history
2014BS ISO 9635-4:2014 Agricultural irrigation equipment. Irrigation valves. Air valves
2007BS ISO 9635-4:2006 Agricultural irrigation equipment - Irrigation valves - Air valves