Variable constant pressure, constant flow variable pressure, and variable flow variable pressure primarily refer to the state of flow and pressure detected at the equipment's water outlet. Here, 'variable' indicates change, 'constant' indicates stability. To understand the above concepts, it is essential first to grasp these definitions. The implementation principles mainly depend on differences in control points and control methods.
① Variable constant pressure: Regardless of how water consumption changes, the pressure at the equipment's water outlet remains constant. The constant pressure control point is located at the equipment's water outlet.
② Constant flow variable pressure: The water supply volume of the equipment remains constant, but as water consumption changes, the pressure also varies accordingly. This control method is generally used in large water plants and pumping stations, where the equipment supplies water based on the average hourly water consumption. When water consumption increases, the pipeline pressure naturally rises, and when water consumption decreases, the pipeline pressure naturally falls.
③ Variable flow variable pressure: As water consumption changes, the pressure at the equipment's water outlet also varies. When detected at the equipment's water outlet, both the flow rate and pressure of the equipment are simultaneously changing.
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