ControlValve의개요및구조
18세기에는Gate Valve, Stop Valve 및현대적인 Plug Valve 등이개발되었고, 1930년경Ball Valve가 개발되었으며, 2차세계대전전후무렵자동제어 Valve가개발되었다. 2. Valve 기능의Trends 고대에는Steam의흐 름을유지하는것을목적 으로하였으나, 산업혁명 시기에는Steam 엔진의
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