一、结构及用途 Structure and purpose 该阀主要用于管路系统中，以防止管路系统超压或维持管路的压力，当泵关闭后还可以减少水锤冲击。也可用于大型供水系统的水锤消除装置，并且阀门控制系统的进口处装有一个自清洗滤网，利用流体特性，使比重较大、直径较大的悬浮颗粒不会进入控制系统，确保主阀的上游供水压力某一设定值上使系统循环畅通无阻，该阀起闭灵敏、安全可靠、动作平稳、使用寿命长。 Use in a pipeline system to prevent it from surpassing pressure or keep the pressure of it．to reduce the water hammers shock after the pump is closed and also and also used as a water hammer remover for a large water supply system．On the inlet of the valves control system a self cleaning filter screen is placed，which，by means of the bigger specific gravity of the fluid，stops the suspension grains of a bigger specific gravity and diameter going into the sys-tern to ensure the main valves water supply pressure at the upstream at a set value to get the system smoothly circulated without any resistance．This valve features sensitive open-close，safety，reliability，stable motion and long duration. 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 PN6 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 550 550 550 610 610 625 645 750 808 864 1135 1185 1325 1385 1445 1325 1430 H1 460 460 460 516 516 520 538 596 655 710 805 855 955 990 1030 905 960 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