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美標旋啟式止回閥H44HAmerican standard swing check valves H44H公稱通徑 Nominal diameter: DN50~DN 1600公稱壓力 Nominal pressure: 150Lb~1500Lb適用介質 Applicable medium:水、污水、海水、油、氣等 Water,dirty water,sea water,oil,steam etc適用溫度 Applicable temperature: -45℃- 450℃