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BS ISO 9635-5:2014 pdf free

BS ISO 9635-5:2014 pdf free.Agricultural irrigation equipment – Irrigation valves
This part of ISO 9635 specifies construction and performance requirements and test methods for control 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 control irrigation valves of DN 15 (1/2 inch) diameter or greater,designed to operate in any position, from fully open to fully closed. The valves can either be directly operated (i.e. the force applied via a spring or diaphragm to the obturator), or pilot-operated (i.e. the force is applied through an adjustable pilot valve via a diaphragm). These valves can also function as check valves.
2 Normative references
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 irigation equipment一Irrigation valves一Part 1: General requirements
ISO 9635-2:2014, Agricultural irrigation equipment一Irrigation valves一Part 2: lsolating valves
ISO 9644, Agricultural irrigation equipment一Pressure losses in irrigation valves一Test method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9635-1 and the following apply.
3.1 control valve
device intended to regulate, within specified limits, one or more functions
Note 1 to entry: The functions are flow rate, water level, and pressure control (upstream or downstream). The valves are also used to start or terminate irrigation system operation.
3.1.1 autonomous control valve
control valve (3.1) that uses the energy from the conveyed water to adjust the position of the obturator for the regulation of a specific function
3.1.2 non-autonomous control val ve
control valve (3.1) that requires external power to adjust the position of the obturator for the regulation of a specific function
3.1.3 pressure-reducing valve
control valve (3.1) that reduces a higher inlet pressure to a constant lower outlet pressure regardless of variations in the flow rate or variations of the inlet pressure.BS ISO 9635-5 pdf download.

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