It is an intelligent valve which uses the energy of medium itself to regulate and control pipeline pressure, which is used for domestic water supply, fire water supply and other industrial water supply systems. By adjusting the pressure reducing pilot valve, the outlet pressure of the king valve can be adjusted. The outlet pressure does not change with the change of inlet pressure and inlet flow. The outlet pressure can be maintained at the set value safely and reliably, and the set value can be adjusted as required to achieve the purpose of pressure reduction.