ISO-9635-3:2014 pdf free
ISO-9635-3:2014 pdf free.Agricultural irrigation equipment一Irrigation valves
This part of ISO 9635 specifies construction and performance requirements and test methods for check valves, intended for operation in irrigation systems with water at temperatures not exceeding 60℃,which can contain fertilizers and other chemicals of the types and concentrations used in agriculture.
It is applicable to hydraulically operated check irrigation valves of DN 15 diameter or greater, designed to operate in the fully open and fully closed positions, but which can also operate for extended time periods in any intermediate position.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 9635-1:2014, Agricultural irrigation equipment一Irrigation valves一Part 1: General requirements
ISO 9644:2008, Agricultural irrigation equipment一Pressure losses in irrigation valves一Test method
Check valves may be equipped with a device to assist closure or balance the weight of the obturator.However, such valves are not considered to have a mechanically-operated obturator The manufacturer shall indicate in the relevant technical documentation the orientations in which the check valves fulfil the requirements of this International Standard.
It is recommended that the valves be designed to permit integral repair and maintenance without removing the valve body from the line.
After testing, the obturator shall not be jammed nor wedged. The differential pressure and flow rate necessary to open the obturator shall not exceed the initial values declared by the manufacturer by more than 10 %. After completion of the test, the differential pressure and flow rate necessary to fully open the obturator shall not exceed the initial values by more than 10 %.
In order to verify this requirement, test the check valve as set out in Annex A for 2500 opening/closing cycles. Following this, it shall still pass the leak-tightness tests as set out in 5.2.1 and 5.2.2, and no breakage of any part shall be detected by visual inspection after the dismantling of the valve. Testing is not required for check valves greater than DN 300.ISO-9635-3 pdf free download.
