200X adjustable pressure reducing valve is a functional valve that uses the energy of the medium itself to adjust and control the pipeline pressure. 200X adjustable pressure reducing valve is used in domestic water supply, fire water supply and other industrial water supply systems. The outlet pressure of the main valve can be adjusted by adjusting the pressure reducing pilot valve. The outlet pressure will not change due to the change of inlet pressure and inlet flow. The outlet pressure can be safely and reliably maintained at the set value, and the set value can be adjusted as needed to achieve the purpose of pressure reduction. The valve has the advantages of accurate pressure reduction, stable performance, safety and reliability, convenient installation and long service life.