NOTE 1 Examples of valve types tested with this method are in ISO 4437‑4, ISO 16135, ISO 16136, ISO 16138, ISO 16139, ISO 16486‑4, ISO 21787, EN 1555‑4[13] and EN 12201‑4 [14].
NOTE 2 Concerning the chemical aggression of the materials, a collection of data is reported in ISO/TR 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 ISO 8659.
ISO 8233
EN ISO 8233