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Help needed regarding hydraulic safety valves

2016-03-30View Original

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When selecting a breathing valve, a hydraulic safety valve of corresponding diameter should also be chosen; however, when the breathing valve is equipped with anti-freezing measures or when the average temperature in January over the years in the area where the tank is installed is higher than 0°C, a hydraulic safety valve may not be necessary. ”In which standard is the origin of this sentence mentioned?

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