FZH系列止回阀
止回阀安装在送排风管道中防止风机停转时的气体倒流，因正压使其开启，当停止送风时，由于叶片及重锤的重力，防止气体倒流。止回阀分方形止回阀与圆形止回阀，方形止回阀的阀体厚度为210mm（本阀装置范围，要求风管中的风速不能少于8m/s）材质：碳钢／镀锌钢
Check valve is installed in vent line to prevent gas inverse flow when blower lays off.(this valve gear requires that the air speed in the wind pipe is larger than 8m/s.) The positive pressure turms it on. When it is out of blast ,gas inverse flow is prevented by gravity of the lamina and heavy punch.Chece valve has square and ball check valves,The valve chest thickness of square check valve is 210mm.
