Introduce
The pressure-reducing valve is a valve that can reduce the inlet pressure to a certain required outlet pressure through regulation and make the outlet pressure automatically maintain stable by relying on the energy of the medium itself. From the point of view of hydrodynamics, the pressure-reducing valve is a throttling element whose local resistance can be changed. That is to say, by changing the throttling area, the velocity and kinetic energy of the fluid can be changed, resulting in different pressure losses, to achieve the purpose of pressure reduction. Then, by the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, and the pressure behind the valve is kept constant within a certain error range.
Explain
Although there is a large head loss of water flow through the pressure-reducing valve, the system is still energy-saving in general because of the reduction of water waste, the reasonable distribution of system flow, and the improvement of system layout and working conditions. When the medium is steam, a pilot piston-type pressure-reducing valve or pilot bellows-type pressure-reducing valve should be selected. For the convenience of operation, adjustment, and maintenance, the pressure-reducing valve shall be generally installed on the horizontal pipeline.