欧美福利视频I欧美成人h版护士I一道本一区二区I这里有精品视频I性网爆门事件集合avI欧美爱爱小视频I六月色丁香I天天干夜夜I免费黄在线I亚洲情在线I国产精品久久久一区二区三区I国产在线精品二区I日韩有码视频在线I日本亚洲欧美I婷婷六月丁I91日韩在线视频I擼一擼av网站I亚洲男同视频I丁香婷婷六月天I自拍偷拍第五页I成人久久精品I日韩人妻无码一区二区三区99I国产综合社区I欧美69影院I国产富婆一级全黄大片I国产一区视频在线播放

一、結構及用途 structure and purpose

      該閥用于水泵出口控制水泵的實際工作揚程 ,以限制水泵的工作流量,限制水泵電機負載,使水泵在較高效率狀態下工作,防止水泵電機在低揚程、大流量、低效率時發生過載現象，防止超額定電流燒壞水泵電機現象發生，同時起到一定節能效果。安裝、維護、調試、檢查方便，使用壽命長，同時具有緩閉清聲止回閥功能。

This valve is used at a water pump＇s outlet to control the real working head of the pump so as to limit the working flow and the motor＇s 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、主要外形及連接尺寸 Schematic diagram of installation

注：安裝示意圖中彈性座封閘閥或蝶閥任選，建議≥ DN350選蝶閥。