TOP-220HB TOP-216HWNPEVB Trochoid Pump | NOP Nippon Oil Pump Replacement

Genlu Hydraulic proudly introduces our TOP Series (TOP-216 / TOP-220) Industrial-Grade Internal Trochoid Piston/Gear Pumps. Specifically engineered for low-pressure, persistent-volume fluid applications, this pump matrix thrives inside centralized forced lubrication networks, CNC machine tool cutting coolant spraying, heavy-duty industrial gearbox oil feeds, high-capacity offline filtration circuits, and general oil transfer manifolds. This series delivers a premium-quality, high-durability, and exact drop-in replacement for global classic NOP (Nippon Oil Pump) TOP-200 series rotary aggregates. We specialize in cross-referencing and supplying heavy-duty build specifications, prominently including the TOP-216HWNPEVB, TOP-220HB, TOP-220HA, TOP-220HBE, and TOP-220HBEF configurations, alongside full integration into motor-pump unit modules.

Within the demanding industrial automation sector, fluid delivery continuity and minimal pressure pulsation directly govern spindle bearing life and the micro-roughness quality of machined components. Genlu’s TOP series trochoid units conform rigidly to original manufacturer geometric profiles. We guarantee 100% Drop-in Interchangeability across standard mounting base configurations (flanged or foot-bracket options), metric drive shafts (standard parallel keyed outputs), port sizing (tapered or parallel pipe threading), and specialized sealing matrices adapted for high-viscosity thermal oils or synthetic coolants. Prior to delivery validation, each trochoid pump undergoes 100% simulated thermal viscosity load testing, suction vacuum retention validation, and full-RPM output flow pulsation frequency spectrum auditing, ensuring near-silent operation and extended service life.

Technical Specifications 

• Product Line: TOP-200 Base Series Industrial Fixed Displacement Internal Trochoid Lubrication Pump

• Core Covered Designation Formats:

  • TOP-216HWNPEVB (Size 16 frame, tailored high-pressure/chemical resilient seal combination profile)

  • TOP-220HB / TOP-220HA (Size 20 frame, standard configuration base flange or standard flexible coupling driver configuration)

  • TOP-220HBE / TOP-220HBEF (Integrated adjustable spring-loaded bypass safety relief valve matrix)

• Geometric Displacement Matrix:

  • TOP-216 Specification: 16.0 $cc/rev$ (Yielding approx. 24.0 $L/min$ delivery flow rating @ 1500 rpm)

  • TOP-220 Specification: 20.0 $cc/rev$ (Yielding approx. 30.0 $L/min$ delivery flow rating @ 1500 rpm)

• Continuous Rated Operating Pressure Boundaries: 0.5 MPa to 1.5 MPa (5 bar to 15 bar / 72.5 psi to 217.5 psi)

• Maximum Intermittent Peak Pressure Threshold: 2.0 MPa to 2.5 MPa (20 bar to 25 bar, determined via matching model alphanumeric suffix options)

• Permissible Operational Shaft Velocity Envelope: Minimum velocity 500 rpm; Maximum continuous speed 1800 rpm to 2000 rpm

• Target Media Viscosity Range: 10 to 500 $mm^2/s$ (cSt; Ideal for standard industrial lubricating oils, turbine oils, and non-corrosive machine tool fluids)

• Initial Dry Suction Vacuum Capability: -0.03 MPa (With pre-wetted fluid ring sealing status)

• Shaft Seal Assembly Layout Classes: Standard high-elasticity NBR lip sealing or specialized FKM / Viton chemical-grade mechanical seals

Key Technical Advantages:

• Low Pulsation & Ultra-Quiet Operation via Single-Tooth Difference Geometry: The trochoid rotor layout utilizes a single-tooth difference internal engagement mechanism. The volumetric expansion and contraction phases between the suction and discharge cavities are exceptionally linear. This setup eliminates the abrupt fluid trapping and trapping spikes typical of external gear designs, dropping noise levels down to 50-55 dB for quiet operation.

• Integrated Compact Security Safety Relief Valve: Models like the TOP-220HBE feature an adjustable, spring-loaded pilot bypass relief valve integrated directly into the pump casing head. If cold oil causes a sudden viscosity spike or a line clogs downstream, the valve cracks open instantly to bypass fluid internally. This protects both the pump body and drive motor without requiring expensive external piping.

• High-Density Wear-Resistant Alloy Rotors for Extended Service Life: Both inner and outer rotors are precision-molded from a high-density, wear-resistant casting alloy. The rotor surfaces undergo micron-scale grinding and gas-nitriding hardening. This balanced profile provides wide contact faces that establish a robust hydrodynamic film, allowing the pump to handle micro-debris or fine cuttings better than traditional vane alternatives.

• Versatile Modular Shaft & Seal Adaptations (e.g., HWNPEVB Configuration): Engineered to perform in challenging industrial environments, offering extensive sealing and interface options. From silicon-carbide mechanical faces to dual Viton lips, these pumps integrate with NOP-standard close-coupled motor faces or parallel keyed shafts for flexible system design.

Application Areas:

• Precision CNC Turning Centers & Machining Enclosures: Headstock spindle box forced-circulation thermal management and high-pressure slide-way cutting coolant spray delivery.

• Heavy Industrial Gearboxes & Reduction Trains: Main lubrication loops for wind turbine speed-increasers, hot-strip steel rolling mill reduction drives, and marine main propulsion gear cases.

• Offline Kidney-Loop Filtration Layouts: Dedicated low-pressure fluid circulation aggregates for high-efficiency heat exchangers and absolute fine-mesh conditioning skid configurations.

Expert Maintenance Tips:

• Never Allow the Rotating Components to Run Dry: The internal hydro-flex bearings and precision rotor faces depend entirely on the fluid medium to maintain film lubrication. Upon initial hookup or after extended maintenance shutdowns, pre-fill the internal pump casing with clean oil through the primary ports before starting the motor. Running dry for even 5 seconds can cause friction welding on the rotor faces, destroying the pump’s self-priming ability.

• Verify Motor Shaft Rotational Direction to Protect Low-Pressure Seals: TOP trochoid pumps are unidirectional. Reversing the electrical wiring will turn the intake port into a pressurized discharge line. Because the front shaft lip seals are only rated for low intake pressures, backward rotation will immediately rupture the seal element, causing external fluid loss.

• Optimize Suction Line Sizing and Restrict High-Micron Mesh Filtration: While trochoid geometry offers strong self-priming capabilities, long intake lines or overly restrictive filters can induce high vacuum status and cavitation. This presents as a sharp metallic rattling noise. To prevent damage, size the intake line slightly larger than the pump port, and use a coarse 80-100 mesh suction strainer rather than fine paper media on the inlet side.