当没有通道被选中时，每组开关的第一个通道（常闭）被连接到一个输出端口。
When no channels are selected, the first channel of each bank, which is normally-closed, is connected to an output port.
排泥阀产品由液压缸和角式截止阀组合而成，液压缸内动力带动瓣升降，使阀体通道开或闭，以达到流体通断。
Mud valves and Angle by the hydraulic cylinder type combination valve, hydraulic power drive cylinder valve lift, the valve open or closed channel, in order to achieve the fluid off.
开关块通过弹簧、推压块调整流道的位置，起到开、闭牙膏通道的作用。
The switch block adjusts the position of the flow passage by a spring and a push pressing block, so the switch block has the function of opening and closing the toothpaste passageway.
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