Top 10 Hydraulic Internal Gear Pumps for Global Buyers?

Rank	Generic Pump Configuration	Typical Displacement Range	Typical Operating Pressure	Typical Speed Range	Common Applications	Fluid Compatibility	Key Selection Requirements
1	Standard Fixed-Displacement Internal Gear Pump	5–250 cm³/rev	Continuous: 160–250 bar Peak: up to approximately 280 bar	500–3,000 rpm	General industrial hydraulics, machine tools, material-handling equipment, and hydraulic power units.	Mineral hydraulic oils such as HLP/HVLP types; confirm seal material for water-glycol and biodegradable fluids.	Match displacement to required flow, verify shaft torque, confirm pressure at the actual operating speed, and provide adequate inlet conditions to prevent cavitation.
2	High-Pressure Internal Gear Pump	10–160 cm³/rev	Continuous: 250–315 bar Peak: commonly 330–350 bar	400–2,500 rpm	Injection-molding machines, presses, mobile hydraulics, clamping systems, and high-force actuators.	Primarily clean mineral oil; high-pressure operation requires verified viscosity, filtration, and seal compatibility.	Check pressure rating at continuous duty, calculate input power using flow and pressure, verify housing and shaft-load limits, and use the manufacturer’s minimum viscosity requirement.
3	Low-Noise Internal Gear Pump	8–125 cm³/rev	Continuous: 160–250 bar	500–3,000 rpm	Factory automation, robotics, laboratory equipment, elevators, and indoor hydraulic power units where acoustic comfort matters.	Mineral oils and selected synthetic or biodegradable fluids when elastomers and internal coatings are approved.	Prioritize hydraulic pulsation, measured sound level, mounting rigidity, pipe resonance, and correct inlet-line sizing rather than pressure rating alone.
4	Compact High-Speed Internal Gear Pump	1–50 cm³/rev	Continuous: 140–210 bar	1,000–4,000 rpm	Compact power packs, battery-powered equipment, agricultural implements, lift tables, and auxiliary circuits.	Clean mineral hydraulic oil; fluid viscosity and aeration control are especially important at high speed.	Confirm maximum speed, suction capability, motor compatibility, thermal capacity, shaft direction, and the required flow at the lowest operating speed.
5	Large-Displacement Internal Gear Pump	100–500 cm³/rev	Continuous: 100–200 bar	300–1,500 rpm	Steel and metal-processing lines, hydraulic presses, marine auxiliaries, lifting systems, and large central power units.	Mineral oils and approved fire-resistant fluids; filtration and reservoir design must support high-volume flow.	Size the suction port generously, check motor starting torque, evaluate heat generation, verify mounting and shaft loads, and confirm reservoir turnover and filtration capacity.
6	Tandem Internal Gear Pump	Each section: 5–125 cm³/rev	Typically 160–250 bar per section	500–2,500 rpm	Mobile machinery, construction equipment, agricultural machinery, and systems requiring two independent hydraulic circuits.	Usually mineral hydraulic oil; confirm whether both sections use the same fluid and whether separate inlet or outlet circuits are required.	Determine the flow and pressure of each section separately, calculate combined input torque, check drive-shaft capacity, and verify the allowable pressure sequence between sections.
7	Multi-Section Internal Gear Pump	2–4 sections; 2–100 cm³/rev per section	Typically 100–250 bar per section	400–2,500 rpm	Complex mobile circuits, synchronized actuators, auxiliary functions, and machines with several independently controlled loads.	Mineral oils and selected alternative fluids subject to seal, viscosity, and temperature approval.	Define each circuit’s flow, pressure, relief protection, and priority; verify total torque, section timing, shaft deflection, and available installation space.
8	Viscosity-Tolerant Internal Gear Pump	10–300 cm³/rev	Continuous: 100–220 bar	300–2,000 rpm	Lubrication systems, machine-tool hydraulics, temperature-variable installations, and applications using higher-viscosity fluids.	Mineral oils across a broad viscosity range; confirm suitability for synthetic, biodegradable, or high-viscosity fluids before use.	Check minimum and maximum viscosity at startup and operating temperature, cold-start torque, internal leakage, suction pressure, and the fluid’s additive package.
9	Corrosion-Resistant Internal Gear Pump	5–150 cm³/rev	Continuous: 80–200 bar	400–2,000 rpm	Marine equipment, coastal installations, washdown areas, chemical-process auxiliaries, and humid industrial environments.	Selected water-glycol, biodegradable, or chemically demanding fluids only when all wetted materials, coatings, and seals are approved.	Specify fluid chemistry, water content, temperature, corrosion exposure, material requirements, electrical protection, and the required ingress-protection level for the installation.
10	Servo- or Variable-Speed-Driven Internal Gear Pump	2–100 cm³/rev	Continuous: 100–250 bar	200–3,000 rpm	Energy-efficient hydraulic power units, electro-hydraulic systems, precision motion control, and demand-based flow applications.	Clean mineral oil is common; verify low-speed lubrication, minimum speed, viscosity range, and seal compatibility for alternative fluids.	Match the pump to the drive-control range, confirm minimum stable speed, calculate dynamic torque, provide pressure feedback and overpressure protection, and validate heat rejection at reduced flow.