Specifies a method for testing the fatigue strength and performance of thermoplastic valves incorporated in a valve assembly with its obturator mechanism under pressure. Repeated opening and closing shall be performed for as many cycles and using the torque as specified by the particular product standard.
Document identifier
ISO 8659:1989
Title
Thermoplastics valves - Fatigue strength - Test method
ISO Category
TC 138/SC 7: Valves and auxiliary equipment of plastics materials
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