valve blockage at

Valve at the blockage is formed gradually, mainly due to pumping concrete finish after washing with high pressure water is not timely, resulting in concrete left in the tube, Ready mix concrete plant Over time, the accumulation of consolidation, causing blockage.
Remedy: After pumping concrete, be sure to use high-pressure water to rinse pump and S tubes. When flushing is invalid, brazing can be knocked to the residue removed, until thoroughly clean.
Remedy: When plugging should be taken immediately repeated, reverse pump method, the pump outlet gradually sucked back into the hopper of the concrete mix and then re-delivery. Also used wooden hammer percussion methods, combined with the positive and reverse pump, making it clear; concrete mix plant methods fail, indicating the severity of the congestion. Identify blockage after paragraph, the tube removed, with high wind or percussion hammer or high-pressure water wash, to be thoroughly cleaned after the pipeline to continue pumping concrete followed by good work.