Piston type steam pressure reducing valve is a specialized automatic valve for steam systems, which adjusts the steam flow through a piston mechanism, reduces the high-pressure inlet steam to the preset outlet pressure, and maintains stable outlet pressure when the inlet pressure fluctuates or the load changes. Its core adopts a pilot structure: the pilot valve senses the outlet pressure deviation and drives the main valve piston to move, achieving precise pressure reduction and stabilization (with an accuracy of ± 5%), suitable for high temperature and high pressure industrial scenarios (such as boilers and thermal pipelines).