Direct role in regulating valve

By range valves, the inlet pressure is reduced to a desired outlet pressure, and rely on the energy of the medium itself, so that automatically maintain a stable outlet pressure safety valve. From the point of view of fluid mechanics, pressure reducing valve is a local resistance to change spending components, that is, by changing the throttle area, so that the kinetic energy of change velocity and the fluid, resulting in different pressure loss, so as to achieve the purpose of decompression. And then rely on regulation and control and regulation systems, so that fluctuations in the valve pressure equilibrium with the spring force, so that the valve pressure is kept constant within a certain error range.