Gives the construction and performance requirements (classification, mechanism, installation, marking, valve body length, connections), and test methods (resistance to internal hydrostatic pressure, tightness, valve opening after tightness test, pressure loss, endurance, tightness after mechanical endurance test) for check valves of nominal sizes 15 mm (0,5 in) up to and including 300 mm (12 in) intended for operation with water at temperatures not exceeding50 degrees C, which may contain fertilizers and chemicals oftypes and concentrations used in agriculture.

ISO 9635-3:2006

KS B 2818:2002 - Modified

KS B ISO 9952:2002 - Identical

KS B 2818:2013 - Modified

GB/T 18691-2002 - Equivalent