主要是为观察工况及维护方便而设置的装置，它具有结构简单，操作方便、快捷、密封性好的特点。 The valve is widely used in the pipe of material pneumatic transportation wind-pipe dust-moving system. it is the ideal device to maintain the valve and ...

axle and rocker etc. Type Ⅰ is single layer controlled by electric system program. Draw stem pushes rocker driving the disc open to discharge and lock air. Program controlling system of type Ⅱ with ...