What is the principle of the Niigata plunger pump, and what are its available models?

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How does the Niigata plunger pump work? Are there any differences when comparing them with plunger pumps from other brands? If one wishes to purchase an original Nippon Precision plunger pump, the lead time for items that are not in stock is over six months; therefore, it is necessary to find ones that are available in stock. So which models are in stock? PVS variable piston pumps feature advantages such as high pressure, low noise, long service life, easy maintenance, and high efficiency. The main models include PVS-1B-16(22)N(P), PVS-2B-35(45)N, as well as the Nisshinbo PVS, PZ, PZE, PZS series: 16/22/35/45/63/70/100/130/180… and the IPH-1B-2B-3B-4B-5B-6B series. Variable pumps such as solenoid valves are pumps with variable displacement. Variable displacement pumps can be single-acting vane pumps, radial piston pumps, or axial piston pumps; among these, radial piston pumps include those with eccentric pistons and those with eccentric shafts, while axial piston pumps include those with swash plates and those with inclined shafts. Gear pumps and double-acting vane pumps are generally positive-displacement pumps. NACHI variable pump, constant power NACHI variable pump. License variable pump types can be divided into: radial piston pumps and axial piston pumps. A radial piston pump is a piston pump in which the reciprocating motion of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: The driving torque is transmitted from the drive shaft to the star-shaped hydraulic cylinder rotor via a cross coupling, ensuring that it is not subjected to any other lateral forces. It is mounted on the distribution shaft. The radially arranged pistons located within the rotor are in close contact with the eccentric stroke stator through hydrostatically balanced shoes. The plunger is connected to the shoe via a ball joint and locked by a snap ring. Two retaining rings hold the slip shoe in place on the stroke stator. An axial piston pump is a piston pump in which the reciprocating motion of the piston or plunger is parallel to the central axis of the cylinder. An axial piston pump operates by utilizing the volume changes generated by the reciprocating motion of pistons parallel to the drive shaft within the piston cylinders. Since both the plunger and the plunger hole are circular components, a high degree of precision can be achieved during processing; as a result, it offers advantages such as high volumetric efficiency, smooth operation, good flow uniformity, low noise, and high operating pressure. However, it is sensitive to contamination by hydraulic oil, has a complex structure, and is relatively expensive. The working principle of the NACHI variable pump: A two-way variable pump is a type of pump that, without changing the rotation direction of the prime mover, can alter the flow direction of the fluid by changing the inclination of the variable mechanism. For example, in an axial piston pump, if the inclination changes from northeast-southwest to northwest-southeast, then the original suction port becomes the discharge port, and the original discharge port becomes the suction port, thereby changing the direction of fluid flow. In a closed loop, this changes the rotation direction of the load; for example, in a swashplate pump, there is rotation of the swashplate and the cylinder block, and the plunger inside the cylinder block draws in oil at one moment and pushes oil out at another. Working principle of Nachi variable displacement pump * Japanese NACHI hydraulic products. Japanese NACHI Nachi gear pumps: Models: IPH (2A, 2B) 3.5/5/6.5/8, (3A, 3B) 10/13/16, (4A, 4B) 20/25/32, (5A, 5B) 40/50/64, (6A, 6B) 80/100/125. IPH-2A-3.5-11,IPH-2A-5-11,IPH-2A-6.5-11,IPH-2A-8-11,IPH-2B-3.5-11,IPH-2B-5-11,IPH-2B-6.5-11,IPH-2B-8-11;IPH-3A-10-20,IPH-3A-13-20,IPH-3A-16-20,IPH-3B-10-20,IPH-3B-13-20,IPH-3B-16-20;IPH-4A-20-20,IPH-4A-25-20,IPH-4A-32-20,IPH-4B-20-20,IPH-4B-25-20,IPH-4B-32-20,IPH-5A-40-21,IPH-5A-50-21,IPH-5A-64-21,IPH-5B-40-21,IPH-5B-50-21,IPH-5B-64-21,IPH-6A-80-21,IPH-6A-100-21,IPH-6A-125-21,IPH-6B-80-21,IPH-6B-100-21,IPH-6B-125-21. NACHI twin gear pumps: IPH-22B,IPH-23B,IPH-24B,IPH-25B,IPH-26B,IPH-33B,IPH-34B,IPH-35B,IPH-36B,IPH-44B,IPH-45B,IPH-46B,IPH-55B,IPH-56B,IPH-66B,IPH-22B-3.5-3.5-11,IPH-22B-3.5-5-11,IPH-22B-3.5-6.5-11,IPH-22B-3.5-8-11,IPH-22B-5-5-11,IPH-22B-5-6.5-11,IPH-22B-5-8-11,IPH-22B-6.5-6.5-11,IPH-22B-6.5-8-11,IPH-8-8-11,IPH-23B-3.5-10-11,IPH-23B-3.5-13-11.