Flow rate issue with pressure-reducing valve for water
Thread Content
There is now a pressure reducing valve for water, with an inlet pressure of 8 kilograms and an outlet pressure of 4 kilograms, using DN50 pipes. The factory stated that when the pressure difference exceeds 3 kilograms, the valve reaches its maximum flow rate, and the flow rate will not increase further even if the pressure difference rises. This seems hard to understand: with a large pressure difference and high flow velocity, the flow rate should increase, right? Seek expert advice
Is the pipeline an open circuit or a closed circuit? It can be calculated based on the flow velocity
The pressure behind the valve is 4 kilograms; it is a closed-loop system. I just want to know why the pressure relief valve has a maximum flow rate Why doesn’t the flow rate increase when the pressure difference exceeds 3 kilograms? The maximum inlet pressure for the pressure relief valve is 10 kilograms.
Theoretically, a pressure reducing valve reduces pressure while also decreasing flow rate. The principle behind this is that the opening degree of the valve core is controlled by adjusting the valve stem; the diameter of the valve core remains constant. The greater the pressure difference, the smaller the opening degree of the valve core, which results in a higher flow velocity, but the flow rate still decreases rather than increasing.