Such as pumping up you must turn off valve to prevent backflow of concrete, then removed the feed tube.
如向上泵送则必须先关闭截止阀，防止砼倒流，然后拆下出料管。
2
Abnormity is never happened about the hopper and s valve of our concrete pump.
中联投放市场的拖泵，其料斗及s阀从未出现异常。
3
The valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. When drilling pipe is taken out and concrete grout is injected, the valve will be opened.