At present, the existing wall pouring is adopted by the lower pouring method, lower pouring method is an innovation of casting method, it overcomes the disadvantages ofslurry density stratification and wall of variable pouring process of pouring method, wallhollowing phenomenon this shortcoming is unable to eliminate, so can not cast out qualified wall; and pouring method to achieve the technological feasibility of lightweight concrete cast-in-situ wall. 

The existing structure of the valve can not meet the rapidsealing cement slurry and one-way bearing function, and therefore cannot be realized in the process of pouring concrete slurry with pressure operation.