{"id":9844,"date":"2026-11-04T21:13:02","date_gmt":"2026-11-04T12:13:02","guid":{"rendered":"https:\/\/now0930.pe.kr\/wordpress\/?p=9844"},"modified":"2026-11-04T21:13:03","modified_gmt":"2026-11-04T12:13:03","slug":"valve-handbook-ch2-cv-equal-percentage-20261104","status":"publish","type":"post","link":"https:\/\/now0930.pe.kr\/wordpress\/valve-handbook-ch2-cv-equal-percentage-20261104\/","title":{"rendered":"Valve Handbook Chapter 2 \u2014 Cv\uc640 Equal Percentage \uc720\ub7c9 \ud2b9\uc131 \uc774\ud574"},"content":{"rendered":"<style>\n\/* Chapter 19 wide: Valve Handbook chapter 2 notes *\/\n.chapter19-wide { box-sizing:border-box; position:relative; width:min(1320px,calc(100vw - 28px)); max-width:none; margin:28px auto 50px; padding:28px 38px; color:#253344; background:#fff; font-family:\"Noto Sans KR\",\"Malgun Gothic\",Arial,sans-serif; font-size:18px; line-height:1.85; overflow-wrap:anywhere; }\n.chapter19-wide * { box-sizing:border-box; }\n.chapter19-wide h1 {font-size:34px;color:#163a5c;line-height:1.4;margin:0 0 10px}\n.chapter19-wide h2 {font-size:27px;color:#194e76;margin:42px 0 18px;padding:0 0 9px;border-bottom:2px solid #d6e4eb}\n.chapter19-wide h3 {font-size:22px;color:#244c68;margin:27px 0 10px}\n.chapter19-wide p {margin:12px 0}\n.chapter19-wide .subtitle{font-size:17px;color:#617385;margin-bottom:28px}\n.chapter19-wide .formula{font-size:26px;font-family:Georgia,\"Times New Roman\",serif;background:#eaf2f8;padding:16px 15px;margin:18px 0;border-radius:8px;text-align:center;overflow-x:auto;white-space:nowrap}\n.chapter19-wide .formula .math-note{display:block;color:#576d7c;font-family:\"Noto Sans KR\",Arial,sans-serif;font-size:15px}\n.chapter19-wide .hint{padding:15px 20px;border-left:4px solid #537b98;border-radius:4px;margin:18px 0;background:#f3f7fa}\n.chapter19-wide .warn{padding:15px 20px;border-left:4px solid #c18a39;border-radius:4px;margin:18px 0;background:#fcf8f0}\n.chapter19-wide .table-wrap{overflow-x:auto;margin:16px 0 26px}\n.chapter19-wide table{border-collapse:collapse;width:100%;font-size:17px;min-width:510px}\n.chapter19-wide th,.chapter19-wide td{padding:11px 12px;border:1px solid #d5dee5;text-align:left;vertical-align:top}\n.chapter19-wide th{background:#e9f0f5;color:#214660}\n.chapter19-wide figure{margin:24px 0;border:1px solid #dbe2e7;border-radius:10px;padding:13px;background:#fff}\n.chapter19-wide figure img{display:block;width:100%;max-width:1100px;height:auto;margin:0 auto}\n.chapter19-wide figcaption{color:#627484;font-size:15px;margin-top:9px;text-align:center}\n.chapter19-wide .small{font-size:15px;color:#607182}\n.chapter19-wide ul{padding-left:26px;margin:8px 0 16px}\n.chapter19-wide li{margin:6px 0}\n.chapter19-wide .summary{border-top:2px solid #194e76;border-bottom:2px solid #194e76;background:#f4f8fb;padding:14px 20px;margin-top:20px}\n.chapter19-wide .summary p{margin:9px 0}\n.chapter19-wide code{font-size:0.92em}\n@media(max-width:720px){.chapter19-wide{padding:17px 15px;font-size:16px}.chapter19-wide h1{font-size:26px}.chapter19-wide h2{font-size:22px}.chapter19-wide h3{font-size:19px}.chapter19-wide .formula{font-size:21px}.chapter19-wide table{font-size:14px}}\n<\/style>\n<div class=\"chapter19-wide\">\n<h1>Valve Handbook \u2014 Chapter 2. Valve Selection Criteria<\/h1>\n<div class=\"subtitle\">\uac1c\uc778 \ud544\uae30\uc5d0\uc11c \ud5f7\uac08\ub838\ub358 \ub0b4\uc6a9 \uc815\ub9ac: Cv \u2192 \ucc28\uc555\uacfc \uc720\ub7c9 \u2192 Inherent\/Installed \u2192 Equal Percentage\uc758 \ubbf8\ubd84 \u2192 dL \u2192 Rangeability\u00b7Shutoff<\/div>\n<p>\ubc38\ube0c\ub97c \uc120\uc815\ud560 \ub54c\ub294 <strong>\uc720\ub7c9\uc744 \uc5bc\ub9c8\ub098 \ud1b5\uacfc\uc2dc\ud0ac \uc218 \uc788\ub294\uac00(Cv)<\/strong>\ubfd0 \uc544\ub2c8\ub77c, <strong>\uac1c\ub3c4\ub97c \ubcc0\ud654\uc2dc\ud0ac \ub54c \uc720\ub7c9\uc774 \uc5b4\ub5bb\uac8c \ubcc0\ud558\ub294\uac00(Flow Characteristic)<\/strong>\ub97c \ud568\uaed8 \uc774\ud574\ud574\uc57c \ud55c\ub2e4. \uc774 \uae00\uc740 \u300eValve Handbook\u300f 3\ud310 Chapter 2\uc640 \uac1c\uc778 \ud544\uae30\ub97c \uae30\uc900\uc73c\ub85c, \ud2b9\ud788 \uc218\uc2dd\uc758 \ub73b\uc744 \ud480\uc5b4 \uc124\uba85\ud55c\ub2e4.<\/p>\n<h2>1. Valve Coefficient \u2014 Cv\uc758 \uc758\ubbf8<\/h2>\n<h3>1.1 Cv\ub294 \ubb34\uc5c7\uc778\uac00?<\/h3>\n<p><strong>Cv\ub294 \uc815\ud574\uc9c4 \ucc28\uc555\uc5d0\uc11c \ubc38\ube0c\uac00 \uc720\uccb4\ub97c \uc5bc\ub9c8\ub098 \ud1b5\uacfc\uc2dc\ud0ac \uc218 \uc788\ub294\uc9c0\ub97c \ub098\ud0c0\ub0b4\ub294 \uacc4\uc218<\/strong>\ub2e4. \uae30\uc900\uc740 \uc57d 60\u00b0F\uc758 \ubb3c\uc774 \ubc38\ube0c \ucc28\uc555 1 psi\uc5d0\uc11c 1\ubd84 \ub3d9\uc548 1 US gallon \ud750\ub974\ub294 \uc870\uac74\uc774\ub2e4(Cv = 1).<\/p>\n<div class=\"formula\">Q = C<sub>v<\/sub> \u221a(\u0394P \/ G<sub>f<\/sub>)<span class=\"math-note\">Q: US gpm \u00b7 \u0394P: psi \u00b7 G<sub>f<\/sub>: \ubb3c \uae30\uc900 \ube44\uc911<\/span><\/div>\n<p>\ubc38\ube0c \uac1c\ub3c4\uc640 \uc720\uccb4 \ube44\uc911\uc774 \uac19\uc73c\uba74 <strong>Q\ub294 \u0394P\uc758 \uc81c\uacf1\uadfc\uc5d0 \ube44\ub840<\/strong>\ud55c\ub2e4. \ucc28\uc555\uc744 4\ubc30\ub85c \ub9cc\ub4e4\uba74 \uc720\ub7c9\uc740 4\ubc30\uac00 \uc544\ub2c8\ub77c 2\ubc30\uac00 \ub41c\ub2e4.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/now0930.pe.kr\/wordpress\/wp-content\/uploads\/2026\/11\/valve-handbook-ch2-cv-equal-percentage-20261104-50364addef40a2db.png\" alt=\"\uc77c\uc815 Cv \uc870\uac74\uc5d0\uc11c \uc720\ub7c9 Q\uac00 \ucc28\uc555 \uc81c\uacf1\uadfc\uc5d0 \ube44\ub840\ud558\ub294 \uace1\uc120\" loading=\"lazy\"><figcaption>\uadf8\ub9bc 1. \uc77c\uc815\ud55c Cv\uc5d0\uc11c \uc720\ub7c9\u2013\ucc28\uc555\uc758 \uc81c\uacf1\uadfc \uad00\uacc4. \ube44\uc555\ucd95\uc131 \uc561\uccb4\u00b7\ub2e8\uc21c\ud654\ub41c \uc2dd\uc744 \uc0ac\uc6a9\ud55c \uc124\uba85\uc6a9 \uadf8\ub798\ud504.<\/figcaption><\/figure>\n<h3>1.2 \ud544\uae30\uc758 K\uc640 Cv\ub294 \uac19\uc740\uac00?<\/h3>\n<p>\ud544\uae30\uc5d0 \uc801\uc740 <strong>Q = K<sub>f<\/sub>\u221a(\u0394P\/\u03c1)<\/strong>\ub294 \ube44\uc555\ucd95\uc131 \uc720\ub3d9\uc758 \uc77c\ubc18\uc801\uc778 \ud615\ud0dc\ub97c \ub098\ud0c0\ub0b8\ub2e4. K<sub>f<\/sub>\ub294 \ud574\ub2f9 \uc2dd\uc5d0\uc11c \uc815\uc758\ud55c \ube44\ub840\uacc4\uc218\ub85c, \uc720\ud6a8 \uc720\ub85c \uba74\uc801\uacfc \ud750\ub984 \ud2b9\uc131\uc744 \ubc18\uc601\ud55c\ub2e4.<\/p>\n<p>\uc774\uc5d0 \ube44\ud574 <strong>Cv\ub294 \ubb3c\u00b7psi\u00b7US gpm\uc774\ub77c\ub294 \uae30\uc900\uc5d0 \ub530\ub77c \uc815\ud55c \ubc38\ube0c \uc720\ub7c9\uacc4\uc218<\/strong>\ub2e4. \ub530\ub77c\uc11c \ub450 \uc2dd\uc740 \uac19\uc740 \ubb3c\ub9ac\uc801 \uc720\ub7c9\u2013\ucc28\uc555 \uad00\uacc4\ub97c \ud45c\ud604\ud558\uc9c0\ub9cc K<sub>f<\/sub>\uc640 Cv\ub97c \uc22b\uc790\ub85c \uace7\ubc14\ub85c \ub3d9\uc77c\uc2dc\ud558\uba74 \uc548 \ub41c\ub2e4.<\/p>\n<div class=\"warn\"><strong>\ud63c\ub3d9 \uc8fc\uc758:<\/strong> \uc720\uccb4\uc5ed\ud559\uc758 \uc555\ub825\uc190\uc2e4\uacc4\uc218 K(\ubb34\ucc28\uc6d0)\ub294 \uc5ec\uae30\uc11c \uc815\uc758\ud55c K<sub>f<\/sub>\uc640\ub294 \ubcc4\uac1c\ub2e4. K\ub77c\ub294 \ubb38\uc790\ub9cc \ubcf4\uace0 \uac19\uc740 \uacc4\uc218\ub85c \ucde8\uae09\ud574\uc11c\ub294 \uc548 \ub41c\ub2e4.<\/div>\n<p class=\"small\">\uc801\uc6a9 \ubc94\uc704: \uc704 Cv \uac04\ub7b5\uc2dd\uc740 \uc815\uc0c1 \ube44\uc555\ucd95\uc131 \uc561\uccb4 \uc720\ub3d9\uc758 \uae30\ubcf8 \uad00\uacc4\uc774\ub2e4. \uae30\uccb4, 2\uc0c1 \uc720\ub3d9, Cavitation, Flashing \ub610\ub294 Choked Flow\uac00 \ub098\ud0c0\ub098\ub294 \uc870\uac74\uc5d0\uc11c\ub294 \ubcc4\ub3c4\uc758 \uc6a9\ub7c9 \uc120\uc815\uc2dd\uacfc \ubcf4\uc815 \uc778\uc790\uac00 \ud544\uc694\ud558\ub2e4.<\/p>\n<h3>1.3 Cv \uc120\uc815\uc758 \ubb38\uc81c<\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\uc0c1\ud0dc<\/th>\n<th>\ubb38\uc81c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cv\uac00 \uc694\uad6c\ub7c9\ubcf4\ub2e4 \uc791\uc74c<\/td>\n<td>\uc694\uad6c \uc720\ub7c9 \ubd80\uc871, \ud070 \ubc38\ube0c \ucc28\uc555, Cavitation\u00b7Flashing \uc704\ud5d8 \uc99d\uac00 \uac00\ub2a5<\/td>\n<\/tr>\n<tr>\n<td>Cv\uac00 \uc9c0\ub098\uce58\uac8c \ud07c<\/td>\n<td>\ub0ae\uc740 \uac1c\ub3c4\uc5d0\uc11c \uc6b4\uc804, \uc791\uc740 \uc6c0\uc9c1\uc784\uc5d0\ub3c4 \ud070 \uc720\ub7c9 \ubcc0\ud654\uac00 \ubc1c\uc0dd\ud574 \uc81c\uc5b4 \ubd88\uc548\uc815 \uac00\ub2a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>2. Flow Characteristic \u2014 \ubc38\ube0c \uac1c\ub3c4\uc640 \uc720\ub7c9\uc758 \uad00\uacc4<\/h2>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\ud2b9\uc131<\/th>\n<th>\uac1c\ub150<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Inherent (\uace0\uc720)<\/td>\n<td>\ubc38\ube0c \uc804\ud6c4 \ucc28\uc555\uc744 \uc77c\uc815\ud558\uac8c \ud55c \uc0c1\ud0dc\uc5d0\uc11c \uac1c\ub3c4\uc640 \uc720\ub7c9(\ub610\ub294 Cv)\uc758 \uad00\uacc4<\/td>\n<\/tr>\n<tr>\n<td>Installed (\uc124\uce58)<\/td>\n<td>\ubc30\uad00\uacfc \uc124\ube44\uc758 \uc555\ub825\uc190\uc2e4\uae4c\uc9c0 \ubc18\uc601\ud55c \uc2e4\uc81c \uac1c\ub3c4\u2013\uc720\ub7c9 \uad00\uacc4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\ubc38\ube0c\uc5d0 \uac78\ub9ac\ub294 \ucc28\uc555\uc740 \uc2e4\uc81c \ubc30\uad00 \uc720\ub7c9\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4. \ub530\ub77c\uc11c \ub611\uac19\uc740 \ubc38\ube0c\ub77c\ub3c4 <strong>\uc124\uce58 \ud6c4 \uc720\ub7c9 \uace1\uc120\uc774 \uace0\uc720 \uace1\uc120\uacfc \ub2e4\ub97c \uc218 \uc788\ub2e4.<\/strong> \uc6d0\uc11c\ub294 \ubc30\uad00\uc758 \uc555\ub825\uc190\uc2e4\uc744 \uace0\ub824\ud558\uba74 Equal Percentage\uac00 Linear\uc5d0 \uac00\uae4c\uc6cc\uc9c0\uace0, Linear\uac00 Quick-open\uc5d0 \uac00\uae4c\uc6cc\uc9c8 \uc218 \uc788\uc74c\uc744 \ubcf4\uc5ec\uc900\ub2e4(2.2.5~2.2.8).<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\ud2b9\uc131<\/th>\n<th>\uac19\uc740 \uac1c\ub3c4 \uc99d\uac00\uc5d0 \ub300\ud574<\/th>\n<th>\uc8fc\uc694 \ud65c\uc6a9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Quick-open<\/td>\n<td>\ucd08\uae30 \uad6c\uac04\uc5d0\uc11c \uc720\ub7c9\uc774 \uae09\uc99d<\/td>\n<td>On\u2013Off<\/td>\n<\/tr>\n<tr>\n<td>Linear<\/td>\n<td>\uc720\ub7c9\uc758 \uc99d\uac00 <em>\uc591<\/em>\uc774 \uc77c\uc815<\/td>\n<td>\ubc38\ube0c \ucc28\uc555 \ube44\uc911\uc774 \ud070 \uacc4\ud1b5<\/td>\n<\/tr>\n<tr>\n<td>Equal Percentage<\/td>\n<td>\uc720\ub7c9\uc758 \uc99d\uac00 <em>\ube44\uc728<\/em>\uc774 \uc77c\uc815<\/td>\n<td>\uc77c\ubc18\uc801\uc778 \uc5f0\uc18d \uc81c\uc5b4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>3. Linear: \uc65c dQ\/dL = k\uc778\uac00?<\/h2>\n<div class=\"formula\">Q = kL &nbsp; \u2192 &nbsp; dQ\/dL = k<\/div>\n<p><strong>dQ\/dL\uc740 Q\u2013L \uadf8\ub798\ud504\uc758 \uc21c\uac04 \uae30\uc6b8\uae30<\/strong>\ub2e4. Linear\uc5d0\uc11c\ub294 \uae30\uc6b8\uae30 k\uac00 \uc77c\uc815\ud558\ubbc0\ub85c, \uc704\uce58\uc5d0 \uad00\uacc4\uc5c6\uc774 \uac19\uc740 \ud06c\uae30\ub85c \ubc38\ube0c\ub97c \uc6c0\uc9c1\uc774\uba74 \uc720\ub7c9\ub3c4 \uac19\uc740 \uc591\ub9cc\ud07c \uc99d\uac00\ud55c\ub2e4.<\/p>\n<h2>4. Equal Percentage: dQ\/dL = nQ\uc758 \uc758\ubbf8<\/h2>\n<h3>4.1 \uc6d0\ub798 \uc2dd\uc744 \ubbf8\ubd84\ud55c\ub2e4<\/h3>\n<div class=\"formula\">Q = Q<sub>0<\/sub>e<sup>nL<\/sup><\/div>\n<p>Q<sub>0<\/sub>\uc640 n\uc740 \uc77c\uc815\ud55c \uac12\uc774\ub2e4. \uac1c\ub3c4 L\uc5d0 \ub300\ud574 \ubbf8\ubd84\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<div class=\"formula\">dQ\/dL = nQ<sub>0<\/sub>e<sup>nL<\/sup> = <strong>nQ<\/strong><\/div>\n<p>\uc989 <strong>\ud604\uc7ac \uc720\ub7c9 Q\uac00 \ud074\uc218\ub85d Q\u2013L \uace1\uc120\uc758 \uc21c\uac04 \uae30\uc6b8\uae30 dQ\/dL\uc774 \ud06c\ub2e4.<\/strong> \uc5ec\uae30\uc11c \uae30\uc6b8\uae30\ub294 \ud604\uc7ac \uc720\ub7c9\uc758 \ud06c\uae30\uac00 \uc544\ub2c8\ub77c, \uac1c\ub3c4\ub97c \uc544\uc8fc \uc870\uae08 \ubcc0\uacbd\ud588\uc744 \ub54c \uc720\ub7c9\uc774 \uc5bc\ub9c8\ub098 \ubbfc\uac10\ud558\uac8c \ubc18\uc751\ud558\ub294\uc9c0 \ub098\ud0c0\ub0b8\ub2e4.<\/p>\n<h3>4.2 \ub450 \uace1\uc120\uc744 \ud55c \ud654\uba74\uc5d0 \uadf8\ub9ac\uba74<\/h3>\n<p>\uc544\ub798 \uc608\uc2dc\ub294 Q<sub>0<\/sub> = 1, n = 2, L = 0~1\uc774\ub2e4. \ud30c\ub780 \uace1\uc120\uc740 Q\uc774\uace0, \ub179\uc0c9 \uace1\uc120\uc740 dQ\/dL\uc774\ub2e4. \uc810\uc120 \uc811\uc120\uc740 \ud574\ub2f9 \uc704\uce58\uc5d0\uc11c \ud30c\ub780 \uace1\uc120\uc758 \uae30\uc6b8\uae30\ub97c \ub208\uc73c\ub85c \ubcfc \uc218 \uc788\uac8c \uadf8\ub9b0 \uac83\uc774\ub2e4.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/now0930.pe.kr\/wordpress\/wp-content\/uploads\/2026\/11\/valve-handbook-ch2-cv-equal-percentage-20261104-8db6d26c0ab01318.png\" alt=\"Equal Percentage \uc720\ub7c9 Q, \ub3c4\ud568\uc218 dQ\/dL, \uac1c\ub3c4 25\ud37c\uc13c\ud2b8\uc640 75\ud37c\uc13c\ud2b8\uc5d0\uc11c\uc758 \uc811\uc120\" loading=\"lazy\"><figcaption>\uadf8\ub9bc 2. Q\uc640 dQ\/dL, \uadf8\ub9ac\uace0 \uac1c\ub3c4 25%\u00b775%\uc5d0\uc11c\uc758 \uc811\uc120. \uc774 \uc608\uc2dc\uc5d0\uc11c\ub294 dQ\/dL = 2Q\uc774\ub2e4.<\/figcaption><\/figure>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\uac1c\ub3c4 L<\/th>\n<th>Q = e<sup>2L<\/sup><\/th>\n<th>dQ\/dL = 2Q<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0%<\/td>\n<td>1.00<\/td>\n<td>2.00<\/td>\n<\/tr>\n<tr>\n<td>25%<\/td>\n<td>1.65<\/td>\n<td>3.30<\/td>\n<\/tr>\n<tr>\n<td>50%<\/td>\n<td>2.72<\/td>\n<td>5.44<\/td>\n<\/tr>\n<tr>\n<td>75%<\/td>\n<td>4.48<\/td>\n<td>8.96<\/td>\n<\/tr>\n<tr>\n<td>100%<\/td>\n<td>7.39<\/td>\n<td>14.78<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"hint\"><strong>\uadf8\ub798\ud504 \uc77d\ub294 \ubc95:<\/strong> \ud30c\ub780\uc0c9 \uace1\uc120\uc774 \uc704\ub85c \uc62c\ub77c\uac08\uc218\ub85d \ud30c\ub780\uc0c9 \uace1\uc120\uc758 \uc811\uc120\uc774 \uac00\ud314\ub77c\uc9c4\ub2e4. \uadf8 \uc811\uc120\uc758 \uae30\uc6b8\uae30 <strong>\uac12<\/strong>\uc744 L\uc5d0 \ub530\ub77c \ub2e4\uc2dc \uadf8\ub9b0 \uac83\uc774 \ub179\uc0c9 \uace1\uc120\uc774\ub2e4.<\/div>\n<h2>5. &#8216;dL\uc744 \uac19\uac8c \uc720\uc9c0\ud55c\ub2e4&#8217;\ub294 \uac83\uc740?<\/h2>\n<p>\uac1c\ub3c4 L\uc740 <strong>\ud604\uc7ac \uc704\uce58<\/strong>\uc774\uba70, \u0394L\uc740 <strong>\uadf8 \uc704\uce58\uc5d0\uc11c \uc6c0\uc9c1\uc778 \ud06c\uae30<\/strong>\ub2e4. 20%\u219230%\uc640 70%\u219280%\ub294 \uc11c\ub85c \ub2e4\ub978 \uc704\uce58\uc5d0\uc11c \uc6c0\uc9c1\uc600\uc9c0\ub9cc \ub450 \uacbd\uc6b0 \ubaa8\ub450 \u0394L=0.1(10%\ud3ec\uc778\ud2b8)\uc774\ub2e4.<\/p>\n<p>\ubbf8\ubd84\uc2dd\uc740 \uac1c\ub3c4\ub97c \uc544\uc8fc \uc870\uae08 \uc6c0\uc9c1\uc77c \ub54c\uc758 \uad00\uacc4\ub2e4.<\/p>\n<div class=\"formula\">dQ\/dL = nQ &nbsp; \u2192 &nbsp; dQ = nQ \u00b7 dL<\/div>\n<p>\uac19\uc740 n, \uac19\uc740 \ubbf8\uc18c \uac1c\ub3c4 \ubcc0\ud654 dL\uc774\ub77c\uba74, \uc720\ub7c9 \ubcc0\ud654\ub7c9 dQ\ub294 <strong>\ud604\uc7ac \uc720\ub7c9 Q\uc5d0 \ube44\ub840\ud55c\ub2e4.<\/strong> Q\uac00 5\ubc30\uc774\uba74 \uac19\uc740 \ubbf8\uc18c \uac1c\ub3c4 \ubcc0\ud654\uc5d0 \ub300\ud55c dQ\ub3c4 5\ubc30\ub2e4.<\/p>\n<p>\uc5ec\uae30\uc11c dL\uc740 \ubb34\ud55c\ud788 \uc791\uc740 \uac1c\ub3c4 \ubcc0\ud654\uc774\uace0, \uc2e4\uc81c\ub85c 1%\ud3ec\uc778\ud2b8 \ub610\ub294 10%\ud3ec\uc778\ud2b8\ub97c \uc6c0\uc9c1\uc77c \ub54c\ub294 \uc720\ud55c\ud55c \ubcc0\ud654 \u0394L\uc744 \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n<h3>5.1 \uc720\ud55c\ud55c \uac1c\ub3c4 \ubcc0\ud654\uc5d0\ub3c4 \uc131\ub9bd\ud558\ub294 \uc815\ud655\ud55c \uad00\uacc4<\/h3>\n<div class=\"formula\">Q(L+\u0394L) \/ Q(L) = e<sup>n\u0394L<\/sup><\/div>\n<p>\uc774 \uc2dd\uc758 \uc624\ub978\ucabd\uc5d0\ub294 <strong>\ud604\uc7ac \uc704\uce58 L\uc774 \uc5c6\ub2e4.<\/strong> \uc989 \ub3d9\uc77c\ud55c \u0394L\uc5d0\uc11c \uc720\ub7c9\uc758 \uc99d\uac00 <em>\ubc30\uc728<\/em>\uc740 \ucd08\uae30 \uc704\uce58\uc640 \uad00\uacc4\uc5c6\uc774 \uc77c\uc815\ud558\ub2e4. \uc774\uac83\uc774 &#8216;Equal Percentage&#8217;\ub77c\ub294 \uc774\ub984\uc758 \uc758\ubbf8\ub2e4.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/now0930.pe.kr\/wordpress\/wp-content\/uploads\/2026\/11\/valve-handbook-ch2-cv-equal-percentage-20261104-24da3af58bcb2d0c.png\" alt=\"20\uc5d0\uc11c30\ud37c\uc13c\ud2b8\uc64070\uc5d0\uc11c80\ud37c\uc13c\ud2b8\ub85c \uc774\ub3d9\ud560 \ub54c \uac19\uc740 \uac1c\ub3c4 \ubcc0\ud654\uc9c0\ub9cc \uc808\ub300 \uc720\ub7c9 \ubcc0\ud654\ub7c9\uc740 \ub2e4\ub978 \uadf8\ub798\ud504\" loading=\"lazy\"><figcaption>\uadf8\ub9bc 3. \uac19\uc740 10%\ud3ec\uc778\ud2b8 \uac1c\ub3c4 \uc99d\uac00\ub77c\ub3c4 \uace0\uc720\ub7c9 \uad6c\uac04\uc758 \u0394Q\uac00 \ub354 \ud06c\ub2e4. \ub450 \uad6c\uac04\uc758 \uc99d\uac00 \ube44\uc728\uc740 \ub3d9\uc77c\ud558\ub2e4.<\/figcaption><\/figure>\n<p><strong>\uc22b\uc790 \uc608:<\/strong> n=2, \u0394L=0.1\uc774\uba74 e<sup>0.2<\/sup>\u22481.2214\uc774\ub2e4. \ub530\ub77c\uc11c \uc5b4\ub5a4 \uac1c\ub3c4 \uad6c\uac04\uc774\ub4e0 10%\ud3ec\uc778\ud2b8 \ub354 \uc5f4\uba74 \ud604\uc7ac \uc720\ub7c9\uc758 \uc57d 22.14%\ub9cc\ud07c \uc99d\uac00\ud55c\ub2e4(\uc774\uc0c1\uc801\uc778 \uace0\uc720 \ud2b9\uc131\uc5d0\uc11c).<\/p>\n<div class=\"hint\"><strong>\ud55c \ubb38\uc7a5 \uc815\ub9ac:<\/strong> Linear\ub294 &#8216;\uac1c\ub3c4\ub97c \ub611\uac19\uc774 \uc62c\ub9ac\uba74 \uc720\ub7c9\uc774 \ub611\uac19\uc740 \uc591\ub9cc\ud07c \uc99d\uac00&#8217;, Equal Percentage\ub294 &#8216;\uac1c\ub3c4\ub97c \ub611\uac19\uc774 \uc62c\ub9ac\uba74 \uc720\ub7c9\uc774 \ub611\uac19\uc740 \ube44\uc728\ub85c \uc99d\uac00&#8217;\ud55c\ub2e4.<\/div>\n<div class=\"warn\"><strong>\ubc94\uc704 \uc8fc\uc758:<\/strong> Q=Q<sub>0<\/sub>e<sup>nL<\/sup>\ub294 \uc81c\uc5b4 \uac00\ub2a5\ud55c \ud589\uc815 \ubc94\uc704\ub97c \ub098\ud0c0\ub0b4\ub294 \uc774\uc0c1\ud654\ub41c \uace0\uc720 \ud2b9\uc131\uc2dd\uc774\ub2e4. L=0\uc744 \uc644\uc804 \ud3d0\uc1c4\ub85c \ud574\uc11d\ud558\uc5ec Q<sub>0<\/sub>\ub97c \uc644\uc804 \ud3d0\uc1c4 \ub204\uc124\ub7c9\uc774\ub77c\uace0 \ub2e8\uc815\ud558\uc9c0 \uc54a\ub294\ub2e4. \ub610\ud55c \uc124\uce58 \uc720\ub7c9 \ud2b9\uc131\uc5d0\uc11c\ub294 \ubc30\uad00 \uc555\ub825\uc190\uc2e4\uc758 \uc601\ud5a5\uc73c\ub85c \uc774 \uad00\uacc4\uac00 \uadf8\ub300\ub85c \uc720\uc9c0\ub418\uc9c0 \uc54a\uc744 \uc218 \uc788\ub2e4.<\/div>\n<h2>6. Rangeability \u2014 \uc81c\uc5b4 \uac00\ub2a5\ud55c \uc720\ub7c9 \ubc94\uc704<\/h2>\n<div class=\"formula\">R = Q<sub>max<\/sub> \/ Q<sub>min<\/sub><\/div>\n<p>\uc81c\uc5b4 \uc131\ub2a5\uc744 \uc720\uc9c0\ud560 \uc218 \uc788\ub294 \ucd5c\ub300 \uc720\ub7c9\uacfc \ucd5c\uc18c \uc720\ub7c9\uc758 \ube44\uc774\ub2e4. \uc608\ub97c \ub4e4\uc5b4 100\uc5d0\uc11c 2\uae4c\uc9c0 \uc548\uc815\uc801\uc73c\ub85c \uc81c\uc5b4\ud560 \uc218 \uc788\ub2e4\uba74 R=50:1\uc774\ub2e4. <strong>\uc774\ub294 \ubc38\ube0c \uac1c\ub3c4\uc758 \ucd5c\ub300\/\ucd5c\uc18c \ube44\uac00 \uc544\ub2c8\ub2e4.<\/strong> \ud615\uc0c1, Seat Leakage, \uc561\ucd94\uc5d0\uc774\ud130 \uc704\uce58 \uacb0\uc815 \uc131\ub2a5 \ub4f1\uc774 \uc601\ud5a5\uc744 \uc900\ub2e4(2.2.9).<\/p>\n<h2>7. Shutoff Requirements \u2014 \ucc28\ub2e8 \uc131\ub2a5<\/h2>\n<p>Rangeability\ub294 &#8216;\ud750\ub974\ub294 \ub3d9\uc548 \uc5b4\ub514\uae4c\uc9c0 \uc720\ub7c9\uc744 \uc81c\uc5b4\ud560 \uc218 \uc788\ub294\uac00&#8217;\uc774\uace0, Shutoff Class\ub294 &#8216;\uc644\uc804\ud788 \ub2eb\uc558\uc744 \ub54c \ud5c8\uc6a9 \ub204\uc124\uc774 \uc5bc\ub9c8\ub098 \ub418\ub294\uac00&#8217;\uc774\ub2e4. \ub450 \uac1c\ub150\uc740 \ub2e4\ub974\ub2e4.<\/p>\n<p>\uc6d0\uc11c\ub294 Class I~VI\ub97c \uc124\uba85\ud55c\ub2e4. Class VI\ub97c \ud754\ud788 Bubble-tight\ub77c \ubd80\ub974\uc9c0\ub9cc, \uaddc\uc815\ub41c \uc2dc\ud5d8 \uc870\uac74\uc758 \ud5c8\uc6a9 \ub204\uc124\uc774 \uc874\uc7ac\ud558\ubbc0\ub85c \uc808\ub300\uc801\uc778 \ubb34\ub204\uc124\uc744 \ub73b\ud558\uc9c0\ub294 \uc54a\ub294\ub2e4. Class V\uc640 VI\ub294 \ub204\uc124 \uae30\uc900\uacfc \uc2dc\ud5d8 \uc870\uac74\uc774 \ub2ec\ub77c \ub2e8\uc21c \uc218\uce58 \ub300\uc18c \ube44\uad50\ub97c \ud574\uc11c\ub294 \uc548 \ub41c\ub2e4.<\/p>\n<h2>8. \ud575\uc2ec \uc815\ub9ac<\/h2>\n<div class=\"summary\">\n<p><strong>\u2460 Cv:<\/strong> \uae30\uc900 \uc870\uac74\uc5d0 \ub530\ub978 \ubc38\ube0c\uc758 \uc720\ub7c9 \ud1b5\uacfc \ub2a5\ub825<\/p>\n<p><strong>\u2461 Q \u221d \u221a\u0394P:<\/strong> \ub3d9\uc77c\ud55c \uc720\uccb4\u00b7\uac1c\ub3c4\uc5d0\uc11c \uc720\ub7c9\uacfc \ucc28\uc555\uc758 \uc81c\uacf1\uadfc \uad00\uacc4<\/p>\n<p><strong>\u2462 dQ\/dL:<\/strong> Q\u2013L \uadf8\ub798\ud504\uc758 \uc21c\uac04 \uae30\uc6b8\uae30, \uc989 \uc720\ub7c9\uc758 \uac1c\ub3c4 \ubbfc\uac10\ub3c4<\/p>\n<p><strong>\u2463 Equal Percentage:<\/strong> dQ\/dL=nQ, \uac19\uc740 \uac1c\ub3c4 \ubcc0\ud654\ub9c8\ub2e4 \uac19\uc740 \ube44\uc728\ub85c \uc720\ub7c9 \uc99d\uac00<\/p>\n<p><strong>\u2464 \u0394L:<\/strong> \ud604\uc7ac \uac1c\ub3c4 L\uacfc \ubcc4\uac1c\uc778 &#8216;\uc5bc\ub9c8\ub098 \ub354 \uc6c0\uc9c1\uc600\ub294\uac00&#8217;<\/p>\n<p><strong>\u2465 Rangeability:<\/strong> \uc81c\uc5b4 \uac00\ub2a5\ud55c \ucd5c\ub300\/\ucd5c\uc18c \uc720\ub7c9 \ube44<\/p>\n<p><strong>\u2466 Shutoff Class:<\/strong> \ub2eb\ud78c \ubc38\ube0c\uc758 \ud5c8\uc6a9 \ub204\uc124 \ub4f1\uae09<\/p>\n<\/div>\n<p class=\"small\">\uc790\ub8cc: Philip L. Skousen, <em>Valve Handbook<\/em>, 3rd ed., Chapter 2 \u00a7\u00a72.1\u20132.3 \/ \uac1c\uc778 \ud544\uae30 Scan_20261104_205535.pdf 1\u20133\ucabd. \uc218\uc2dd \uc720\ub3c4, \uc124\uba85\uc6a9 \uc218\uce58 \ubc0f \uadf8\ub798\ud504\ub294 \uc774\ud574\ub97c \ub3d5\uae30 \uc704\ud574 \uc791\uc131\ud55c \uac83\uc774\ub2e4. \uc6d0\uc11c\uc758 \uc0ac\uc9c4\uc740 \uc7ac\uc218\ub85d\ud558\uc9c0 \uc54a\uc558\ub2e4.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\uac1c\uc778 \ud544\uae30\uc5d0\uc11c \ud63c\ub3d9\ud588\ub358 Cv, \ucc28\uc555\uacfc \uc720\ub7c9, Q=e^(nL), dQ\/dL=nQ\uc758 \uae30\uc6b8\uae30 \uc758\ubbf8, \ub3d9\uc77c \uac1c\ub3c4 \ubcc0\ud654, Rangeability\ub97c \uadf8\ub9bc\uacfc \uc218\uc2dd\uc73c\ub85c \uc124\uba85\ud569\ub2c8\ub2e4.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1185],"tags":[1626,1599,2277,1608,1622,2278,1424],"wpgpxmaps_activity":[],"class_list":["post-9844","post","type-post","status-publish","format-standard","hentry","category-1185","tag-cv","tag-equal-percentage","tag-flow-characteristic","tag-rangeability","tag-valve-handbook","tag-2278","tag-1424"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/9844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/comments?post=9844"}],"version-history":[{"count":4,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/9844\/revisions"}],"predecessor-version":[{"id":9848,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/9844\/revisions\/9848"}],"wp:attachment":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/media?parent=9844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/categories?post=9844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/tags?post=9844"},{"taxonomy":"wpgpxmaps_activity","embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/wpgpxmaps_activity?post=9844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}