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通过对水泥砂浆、封孔器等封孔方法的分析，研究了它们在“三软”煤层中注水时存在的主要问题，并开发了单向自动截止阀，它与封孔器配套使用，在郑州矿务局超化矿11091工作面进行试验取得了良好的效果．
Through the analysis of the sealing methods such as cement mortar and sealing device, the main problems existed when they were injected into the “three soft” coal seam were explored. A one-way automatic shut-off valve was developed, which was used in combination with the sealing device. Zhengzhou Mining Bureau Superminerals 11091 working face and achieved good results.