The pressure reducing valve is a valve that reduces the inlet pressure to a required outlet pressure through adjustment, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. From the perspective 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 rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of pressure reduction. Then rely on the adjustment of the control and regulation system to balance the fluctuation of pressure behind the valve with the spring force, so that the pressure behind the valve remains constant within a certain error range.
