Single cover retaining screw mounted on top of the flow switch for easy access.
在流量开关上安装一个盖子固定螺丝，便以打开进入。
"Clamp Type" knee switch which don't need to cut the table, drilling hole, install by screw. It's easy to fix them up.
“卡钳式”膝动开关，无须切割桌板、钻孔、装订螺丝，安装容易、简便。
The switch position of butterfly disc is limited by the adjusting screw pole on the worm gear transmission device. The indicating device displays the position of the valve switch.
蝶板的开关位置都由蜗轮传动装置上的调节螺杆限位，指示牌指示阀的开关位置。
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