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Here is the rewritten and improved English version of your content, with a natural, human-like tone, and over 500 characters: --- This product comes from the U.S. Department and integrates advanced 20 Series hydraulic transmission technology and manufacturing. The 20 Series variable piston pump features a swash plate structure that enhances performance in closed-loop hydrostatic drive systems. It is equipped with a charge pump and a variable displacement pump, while the motor is a fixed displacement motor with an integrated valve block or motor block. The system supports manual (MDC), hydraulic (HDC), and electric (EDC) control options, allowing precise regulation of oil flow, direction, and power. The pump’s output flow is proportional to the spindle speed and displacement. The pump’s displacement can be adjusted by changing the angle of the swash plate, ranging from zero to maximum. The flow can be reversed by altering the swash plate’s position, but this requires a transition through the neutral point. This series of pumps is widely used in hydraulic gear motors, known for their reliability, ease of operation, and application in concrete delivery trucks. Key features of the PV20 Series Variable Piston Pump include: 1. High-quality manufacturing and user-friendly operation. 2. Tapered roller bearings on the spindle allow it to withstand greater axial forces. 3. Additional pumps can be connected in series for enhanced performance. 4. Mechanical control ensures the swash plate maintains its displacement angle. 5. When the control lever is released, the swash plate returns to the neutral position, stopping the flow. 6. Excellent sealing design prevents leakage even under high-temperature conditions. 7. Compatible with servo valves and remote control systems. 8. Easy maintenance with standard tools for plunger removal and replacement. We offer comprehensive services including hydraulic systems, valves, and technical consulting for custom hydraulic solutions.

Model	Maximum Displacement	Pressure/MPA		Max Speed (r/min)	Output Power (at 10MPA, 1500r/min)/KW	Variable Pump
		Rated	Max			Flow at Maximum Speed (L/min)	Charge Pump Displacement (mL/R)	Weight (kg)
20	33.3	21	35	3590	8.2	119.54	12.3	45
21	51.6	21	35	3500	12.7	180.6	16.2	53
22	69.8	21	35	2810	17.2	196.14	18.03	63
23	89	21	35	2590	21.9	230.51	18.03	78

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