Pressure reducing valve working principle

- Jul 22, 2019-

The pressure reducing valve is a valve that adjusts the inlet pressure to a certain required outlet pressure and relies on the energy of the medium itself to automatically maintain the outlet pressure. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of decompression. Then, relying on the adjustment of the control and regulation system, the fluctuation of the post-valve pressure is balanced with the spring force, so that the post-valve pressure remains constant within a certain error range.


Basic performance of pressure reducing valve:



     (1) Pressure regulation range: It refers to the adjustable range of the pressure reducing valve output pressure P2, within which the pressure reducing valve is required to reach the specified accuracy. The pressure regulation range is mainly related to the stiffness of the pressure regulating spring.



     (2) Pressure characteristics: It refers to the characteristic that the output pressure fluctuates due to input pressure fluctuation when the flow rate g is constant. The smaller the output pressure fluctuation, the better the characteristics of the pressure reducing valve. The output pressure must be lower than the input pressure setting to substantially not change with the input pressure.



     (3) Flow characteristics: It refers to the input pressure timing, and the output pressure changes with the change of the output flow g. When the flow rate g changes, the smaller the change in the output pressure, the better. Generally, the lower the output pressure, the smaller it fluctuates with the change in output flow.