Historical
ISO 9635:1990
Irrigation equipment - Hydraulically operated irrigation valves
Specifies construction and performance requirements and test methods for valves, intended for operation in irrigation systems, with water at temperatures not exceeding 50 °C, which may contain fertilizers and chemicals of the types and concentration used in agriculture. Applies to valves of 15 mm diameter or greater.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]