forged check 中文意思是什麼
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Marine forged steel male thread stop and check valves
船用外螺紋鍛鋼截止止回閥 -
Velan forged steel gate, globe and check valves have been proven in critical service applications for over 50 years
Velan鍛鋼閘閥、截止閥和止回閥在關鍵部位的應用已經過50年的考驗。
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