Improvement of the Vacuum Breaker Valve in Gaobazhou Hydropower Plant
The vacuum breaker valve in Gaobazhou Hydropower Plant can be opened when a vacuum is formed in the u-nit runner chamber,which can break the vacuum and effectively reduce the occurrence of cavitation erosion of the run-ner blades.While,since the units were put into operation,various issues were encountered in the vacuum break valve device such as inconvenient adjustment,maintenance and repair.During the maintenance,the vacuum breaker valve of the 1F unit was completely replaced and improved.The original springs that had been in use for many years were re-placed with new ones.The spring force was adjusted by hanging weight method.After the overall replacement and reno-vation,the vacuum breaker valve now is of good sealing and performance.
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