1. There were problems of sealing untightness and leakage occurred in the feed pump recirculating valve of Liaoning Huadian Tieling Power Generation Corporation Limited. 1问题的提出与分析辽宁华电铁岭发电有限公司给水泵再循环阀在运行过程中存在许多问题，如阀门密封不严，泄露严重，不能满足最小流量的调节作用。