The key difference between fixed displacement piston pump and variable displacement piston pump is that fixed displacement piston pump delivers a fixed amount of fluid per revolution or stroke whereas variable displacement piston pump delivers a variable amount of fluid per revolution or stroke . Fixed displacement piston pumps are typically used in applications that require a fixed flow, such as lubrication systems or low pressure applications that require a constant flow. These pumps are simple and reliable, and their output can be precisely controlled by adjusting the speed of the pump. On the other hand, variable displacement piston pumps are used in applications that require regulated flow, such as hydraulic systems that require variable flow. These pumps can be adjusted to provide a range of flows by changing the displacement of the pump, usually by adjusting the angle of the swash plate in the pump. Variable displacement piston pumps are generally more complex and more expensive than fixed displacement piston pumps, but they offer greater flexibility and can be used in a wider range of applications. On the other hand, a variable displacement piston pump is designed to vary its output flow according to system requirements. This is accomplished by changing the angle of the swash plate to change the displacement of the plunger. By changing the angle of the swash plate, the effective length of the plunger stroke changes, resulting in a change in output flow. Variable displacement piston pumps have the advantage of being more energy efficient because they can adjust output flow to meet system demand, reducing the need for energy-wasting pressure control valves. They also provide greater flexibility in system design and can be used in applications requiring precise flow control. 90-L-055-KA-5-AB-60-S-3-S1-C-04-GBA-35-35-24 90L055KA5AB60S3S1C04GBA353524 90-L-055-KA-5-AB-60-S-4-C6-C-03-GBA-35-35-24 90L055KA5AB60S4C6C03GBA353524 90L055-KA-5-AB-60-S-4-C6-C-03-GBA-35-35-24 90L055KA5AB60S4C6C03GBA353524 90-L-055-KA-5-AB-80-D-3-S1-L-03-GBA-26-26-28 90L055KA5AB80D3S1L03GBA262628 90-L-055-KA-5-AB-80-L-4-C6-D-03-GBA-32-32-26 90L055KA5AB80L4C6D03GBA323226 90-L-055-KA-5-AB-80-P-3-S1-C-03-GBA-35-14-24 90L055KA5AB80P3S1C03GBA351424 90-L-055-KA-5-AB-80-R-3-S1-C-03-GBA-35-35-24 90L055KA5AB80R3S1C03GBA353524 90-L-055-KA-5-AB-80-R-3-S1-D-03-GBA-35-35-24 90L055KA5AB80R3S1D03GBA353524 90-L-055-KA-5-BB-60-P-3-C6-C-03-GBA-32-32-24 90L055KA5BB60P3C6C03GBA323224 90L055-KA-5-BB-60-P-3-C6-C-03-GBA-32-32-24 90L055KA5BB60P3C6C03GBA323224 To sum up, the main difference between fixed displacement piston pump and variable displacement piston pump is that the former is designed to provide a fixed output flow, while the latter can change its output flow according to the requirements of the system. Variable displacement piston pumps, on the other hand, are designed to vary the amount of fluid they displace according to system needs. They can adjust displacement mechanically or hydraulically in response to changes in system flow and pressure requirements. These pumps can run at full pressure, but their output will be adjusted according to the requirements of the system. Variable displacement piston pumps are more versatile than fixed displacement piston pumps because they can vary the output to meet the needs of the system. They are ideal for applications requiring variable flow rates or machines requiring precise flow control. Due to their adjustability and greater precision, they are generally more complex and more expensive than fixed displacement pumps. As the name implies, a fixed-displacement piston pump delivers a fixed volume of fluid with each stroke of the plunger. These types of pumps are often used in applications that require constant flow, such as spraying or lubrication systems. Variable displacement plunger pumps, on the other hand, are capable of varying the volume of fluid delivered with each stroke of the plunger. This means that the pump flow can be adjusted to meet the changing requirements of the system. Variable displacement pumps are often used in applications such as hydraulic systems, where the load on the system may vary and flow needs to be adjusted accordingly. Overall, the main difference between these two types of pumps is their ability to vary the amount of fluid delivered. Fixed volume pumps deliver a fixed volume with each stroke, while variable displacement pumps can adjust the volume of fluid delivered to meet changing system requirements. 90-L-055-KA-5-BB-60-P-3-C6-D-03-GBA-23-23-22 90L055KA5BB60P3C6D03GBA232322 90-L-055-KA-5-BB-60-R-3-C6-C-02-GBA-35-35-24 90L055KA5BB60R3C6C02GBA353524 90L055-KA-5-BB-60-R-3-C6-C-02-GBA-35-35-24 90L055KA5BB60R3C6C02GBA353524 90-L-055-KA-5-BB-60-S-3-C6-C-03-GBA-32-32-24 90L055KA5BB60S3C6C03GBA323224 90-L-055-KA-5-BB-60-S-3-S1-C-00-GBA-35-35-24 90L055KA5BB60S3S1C00GBA353524 90-L-055-KA-5-BB-60-S-3-S1-C-03-GBA-35-35-24 90L055KA5BB60S3S1C03GBA353524 90-L-055-KA-5-BC-60-L-3-C6-C-03-GBA-35-35-20 90L055KA5BC60L3C6C03GBA353520 90-L-055-KA-5-BC-60-L-3-S1-C-04-GBA-35-35-24 90L055KA5BC60L3S1C04GBA353524 90L055-KA-5-BC-60-L-3-S1-C-04-GBA-35-35-24 90L055KA5BC60L3S1C04GBA353524 90-L-055-KA-5-BC-60-P-3-S1-D-03-GBA-17-17-20 90L055KA5BC60P3S1D03GBA171720 Here are some other differences between the two plunger pumps: Application: Fixed displacement piston pumps are typically used in applications requiring a fixed flow rate, such as chemical dosing, food processing, and water treatment. On the other hand, variable displacement piston pumps are used in applications that require regulated flow, such as hydraulic systems, oil and gas treatment, and high pressure cleaning systems. Control: Quantitative piston pumps are generally controlled by adjusting the stroke length or speed of the pump, while variable displacement piston pumps are controlled by adjusting the displacement or pressure of the system. Efficiency: Variable displacement piston pumps are generally considered more efficient than fixed displacement piston pumps because they can adjust flow to meet system demand, reducing energy consumption and increasing overall system efficiency. Cost: Fixed displacement piston pumps are generally less expensive than variable displacement piston pumps because they are simpler in design and do not require the same level of precision control. However, the total cost of the pump will depend on the specific application requirements as well as the size and capacity of the pump. Maintenance: Fixed displacement piston pumps are generally easier to maintain than variable displacement piston pumps because they have a simpler design and fewer moving parts. However, both types of pumps require regular maintenance to ensure optimal performance and prevent downtime.