2, Constant pressure variable pump system
The system using a constant pressure variable pump will output full flow when the system pressure is lower than the set PC pressure value (maximum pressure/compensation pressure); When the system pressure reaches the set PC value, the pump changes displacement to reduce the flow rate and maintain the system pressure at the set PC value. Under normal circumstances, when the constant pressure variable displacement pump system is in standby mode, it is at high pressure and small displacement. Its ideal working range is in the downward section of the P-Q curve (PC pressure setting range). In this section, the pump displacement will be automatically adjusted according to the system's needs, so as to only output the flow required by the load, without excess flow waste, but the pressure will be maintained at the PC setting value.
Compared to the quantitative pump system, the constant pressure variable system only outputs the flow required by the load, so there is no overflow loss, only throttling loss, which is more energy-efficient.
The constant pressure variable system maintains high pressure throughout the entire pipeline system during standby, which is more suitable for applications with high response requirements. And due to its highest pressure control function, it is also commonly used for hydraulic system pressure cutoff protection.
