ISO 9635-4:2014 pdf free

ISO 9635-4:2014 pdf free.Agricultural irrigation equipment一Irrigation valves
Test results shall comply with the requirements of ISO 9635-1:2014, 5.4.
The characteristics given by the manufacturer in the form of a graph or table shall be the airflow as a function of inlet pressure. When this is measured according to the conditions defined hereafter in the relevant subclauses of this part of ISO 9635, the flow shall be not less than 90 % of the value indicated by the manufacturer at a minimum of three points on the curve, these points being indicative of the range and functions of the valve.
Show the performance data at standard conditions of temperature and barometric pressure.
Conductthe type testas setoutin AnnexA. Compare the results with the values given in the manufacturer’s catalogue and the difference shall be no greater than ±10 %.
Conductthe type testas set outin Annex B. Compare the results with the values given in the manufacturer’s catalogue and the difference shall be no greater than ±10 %.
Verify the air venting function by measuring the section of the small orifice of the valve, calculating the flow through it at sonic conditions and comparing the result with the value given in the manufacturer’s catalogue. The difference shall be no greater than ±10 %.
To calculate the flow, use the M51 AWWA formula, changing the units from US units to SI units.
Evaluate the endurance of a valve with air intake and/or air release functions by subjecting the valve to 250 consecutive cycles of flling and draining in accordance with Annex C, with the pressure varying from atmospheric to the allowable operating pressure. The valve shall open and close fully during the test and shall pass the watertightness tests as set out in a 5.3.1 and 5.3.2 after the 250 cycles.
Evaluate the endurance of a valve with air venting function by subjecting the valve to 2 500 consecutive cycles of air venting. This may be achieved by continuous injection of air into the system, allowing the valve to cycle automatically, or by cyclic injection of air, depending on the type of valve. The valve shall open and close fully at each cycle of the test and shall pass the watertightness tests as set out in 5.3.1 and 5.3.2 after the 2 500 cycles.ISO 9635-4 pdf free download.