一、结构及用途 structure and purpose 该阀用于水泵出口控制水泵的实际工作扬程 ,以限制水泵的工作流量,限制水泵电机负载,使水泵在较高效率状态下工作,防止水泵电机在低扬程、大流量、低效率时发生过载现象，防止超额定电流烧坏水泵电机现象发生，同时起到一定节能效果。安装、维护、调试、检查方便，使用寿命长，同时具有缓闭清声止回阀功能。 This valve is used at a water pumps outlet to control the real working head of the pump so as to limit the working flow and the motors load of it，make the pump working in a higher efficiency, prevent the motor from being overloaded in case if a low head，a big flow or a low efficiency and from being burnt due to an extra-rated cu r rent，with a certain energy saving effect Easy installation，maintenance，adjustment and check，long duration and of the function to be a slowly closed silencing check valve. 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 80 100 125 150 200 250 300 350 400 450 500 600 700 800 L 180 180 180 203 203 216 241 292 330 356 495 622 698 787 914 978 978 1295 1448 1956 PN10 D 105 115 135 145 160 180 195 215 245 280 335 390 440 500 565 615 670 780 895 1010 D1 75 85 100 110 125 145 160 180 210 240 295 350 400 460 515 565 620 725 840 950 PN16 D 105 115 135 145 160 180 195 215 245 280 335 405 460 520 580 640 705 840 910 1020 D1 75 85 100 110 125 145 160 180 210 240 295 355 410 470 525 585 650 770 840 950 PN25 D 105 110 135 145 160 180 195 230 270 300 360 425 485 550 610 660 730 840 955 1070 D1 75 85 100 110 125 145 160 190 220 250 310 370 480 490 550 600 660 770 875 990 H 172 172 172 265 265 310 350 460 520 570 695 780 905 1025 1080 1030 1135 1270 1460 1640 H1 106 106 106 210 210 215 245 305 365 415 510 560 658 696 735 610 665 725 865 925 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 Recomended to select the butterfly valve in case of ≥ DN350
