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ISO 8659:1989 Thermoplastics valves - Fatigue strength - Test method
standard by International Organization for Standardization, 07/01/1989
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Full Description
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.