Currently, most people tend to prioritize centrifugal pumps when selecting a boiler feed pump. However, under high pressure, low-flow conditions, opting for a plunger pump is actually a better choice.   1. Differences Between Plunger Pumps and Centrifugal Pumps Plunger pumps are positive displacement pumps that rely on the reciprocating motion of the plunger to change the sealed volume and thereby draw in and discharge the fluid. Centrifugal pumps rely on the rotation of the impeller to impart centrifugal force to the fluid and transport it. Additionally, their pressure-flow characteristics differ. Plunger pumps can deliver stable high pressure; their output pressure does not decrease significantly as flow rate drops, allowing them to operate stably under low-flow, high pressure conditions. In contrast, the output pressure of centrifugal pumps continues to rise as flow rate decreases. Once the flow rate falls below a certain range, operating efficiency drops sharply, and the pump and unit are prone to overload damage.   2. Applications of Plunger Pumps In boiler feed applications, plunger pumps are more suitable than centrifugal pumps when the boiler requires high operating pressure and relatively low feed flow — for example, in high pressure once-through steam boilers and high pressure steam injection boilers. In addition, if the boiler feed system demands high pressure precision and requires accurate control of pressure output, plunger pumps also outperform centrifugal pumps. They are better able to match boiler operating conditions and help reduce long-term operation and maintenance costs.   Overall, plunger pumps and centrifugal pumps are each suited to specific applications. When selecting a boiler feed pump, the decision should be based on the actual operating conditions, including pressure, flow rate, and operational accuracy requirements. Elephant Machinery’s boiler feed pumps meet the requirements of high pressure, low-flow applications that demand high precision in pressure control.