The steam pressure reducing valve is suitable for water, steam and air medium pipe. By adjusting, the inlet pressure of steam pressure reducing valve is reduced to a certain outlet pressure. When the inlet pressure and flow rate change, the outlet pressure is automatically kept within a certain range by the energy of the medium itself, but the difference between the inlet pressure and outlet pressure must be greater than 0.2Mpa /cm. 
  
The steam pressure reducing valve works by throttling the opening and closing parts to reduce the inlet pressure to a required outlet pressure and keep the outlet pressure stable.Steam pressure reducing valve leave factory, adjust the spring is in the uncompressed state, at this time the main valve disc in the closed state, when using the steam pressure reducing valve, adjust screw clockwise, compress adjusting spring to make the membrane valve open the disc, medium go to the piston above from a hole to b holes through valve seat. the piston under the action of medium pressure move down to promote the main valve seat and make the medium flow to downstream. when the valve after pressure is more than the setting pressure, push the diaphragm up to regulate spring compression, pay disc move to close the direction, then reduce flow into the piston at the top of the medium, pressure drops, at this time the main valve disc on the main valve disc spring force to push down, the clearance of the main valve disc and the main seat is reduced, the medium flow rate is less, also to make the  after valve pressure drops to a new equilibrium, whereas when the valve after pressure is lower than the set pressure, the main valve disc and the main seat clearance increases, the medium flow rate also will increase, make the valve after pressure is increased to a new equilibrium. 
    
Steam pressure reducing valve Y43h-16 with 0.05 ~ 0.4mpa adjusting spring, Y43h-25 with 1 ~ 1.6mpa adjusting spring, Y43h-40 with 1 ~ 1.6mpa adjusting spring, 1.6 ~ 2.5mpa spring, Y43h-64, with 1 ~ 3MPa adjusting spring. The user can choose pressure and adjusting spring according to the value of outlet pressure.The steam pressure reducing valve usually has several specifications such as DN50 ~ DN100, and the working pressure before and after the valve is <1MPa and 0 respectively.1 to 0.Within 5MPa, the range error is + / - 5% ~ 10%.