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While designing a hydraulic system involve control valve, sufficient pressure drop across control valve is required for proper controllability from minimum to maximum flow. As rule of thumb, pressure drop (dP) across control valve may be at least 20% - 25% of maximum line loss with minimum 0.7 bar.
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1) 0.7 bar¸¦ Àû¿ëÇÏÁö ¾Ê°í, ³·Àº °ª(with µ¿ÀÏ À¯·®)À» vendor¿¡°Ô ÁÖ°Ô µÇ¸é Cv valve°¡ °á±¹ Å©°Ô sizingµÉ °ÍÀÔ´Ï´Ù¸¸, ±×·¸°Ô µÇ¸é ½ÇÁ¦·Î À¯·®ÀÌ È带 ¶§ ´õ ¸¹ÀÌ valve¸¦ closeÇÒÅ×´Ï, controllability¿¡ ´õ ÁÁÀº °ÍÀÌ ¾Æ´ÑÁö¿ä?
2) 0.7 bar¶ó´Â °ªÀÌ ¸¸¾à control valve design ÀÚü(trip Çü»ó)¿¡ °ü·ÃµÈ °ÍÀ̶ó¸é, process condition°ú´Â º°µµ·Î vendor°¡ ÀÚüÀûÀ¸·Î Àû¿ëÀ» ÇØ¾ß ÇÏ´Â °ÍÀÌ ¾Æ´ÑÁö Àǹ®ÀÔ´Ï´Ù. Áï, Pressure control valveÀÇ °æ¿ì ¸¸¾à ½Ã½ºÅÛÀûÀ¸·Î ¿ä±¸µÇ´Â differential pressure°¡ 5 barÀΰæ¿ì, 0.7 bar(Vendor trim design)+4.3 bar(closing by actuator)·Î °í·Á°¡ µÇ¾ß ÇÑ´Ù´Â °ÍÀÎÁö¿ä.
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