一、结构及用途 Structure and purpose 该阀用于空调系统供/回水之间以平衡压差的阀门，可提高系统的利用率，保持压差的准确恒定值，并可限度地降低系统的噪音，以及过大压差对设备造成的损坏。该阀优越于平衡阀，它不需执行机械，靠介质自身的压力差来达到系统平衡之功能，节约能源及安装场地空间。 A valve used between water supply/back of an air conditioning system order to balance the pressure differential and able to raise the systems utility．keep the pressure differential at an accurately constant value and to lower ths systems noise and the damage to the equipment due to an extra-big pressure differential to the utmost extent．1t is superior to the other balancing valves，needs no other execution machinery.gets the system balanced completely depend-ing on the pressure differential of the mediums own and saves energy and the installation space． 四、主要外形及连接尺寸 Schematic diagram of installation 公称通径 DN(mm) 20 25 32 40 50 65 80 100 125 150 200 250 300 350 400 450 500 L 180 180 180 203 203 216 241 292 330 356 495 622 698 787 914 978 978 PN10 D 105 115 135 145 160 180 195 215 245 280 335 390 440 500 565 615 670 D1 75 85 100 110 125 145 160 180 210 240 295 350 400 460 515 565 620 PN16 D 105 115 135 145 160 180 195 215 245 280 335 405 460 520 580 640 705 D1 75 85 100 110 125 145 160 180 210 240 295 355 410 470 525 585 650 PN25 D 105 110 135 145 160 180 195 230 270 300 360 425 485 550 610 660 730 D1 75 85 100 110 125 145 160 190 220 250 310 370 430 490 550 600 660 H 550 560 575 590 610 625 642 750 808 864 1135 1185 1325 1385 1445 1545 1720 H1 125 130 135 145 160 180 200 270 310 320 370 430 480 525 580 635 705 注：安装示意图中弹性座封闸阀或蝶阀任选，建议≥DN350选蝶阀。 Note：Either elastic seat ring sealed gate valve or butterfly valve can be selected in the schematic diagram of installation.Recommended to select the butterfly valve in case of≥DN350