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Description of BS EN ISO 8233:2024 2024This document specifies a test method for the determination of the opening, closing and running torque of thermoplastics valves. This document is applicable to all types of manually operable thermoplastics valves, with or without actuator, intended to be used for the transport of fluids. NOTE 1Â Â Â Â Â Â Â Examples of valve types tested with this method are in ISOÂ 4437-4, ISOÂ 16135, ISOÂ 16136, ISOÂ 16138, ISOÂ 16139, ISOÂ 16486-4, ISOÂ 21787, ENÂ 1555-4[13] and ENÂ 12201-4 [14]. This document does not specify the relationship between the torque and its possible increase after prolonged use of the valve under a specific working condition or wear/chemical aggression of the materials. NOTE 2Â Â Â Â Â Â Â Concerning the chemical aggression of the materials, a collection of data is reported in ISO/TRÂ 10358 concerning the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand prolonged use with repeated opening and closing operations. Further information is provided in ISOÂ 8659.
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