Description
EP-NRV090 Worm Reducer — 750 Nm Heavy-Duty Shaft-Mount for Mining Conveyors & Pump Stations
The EP-NRV090 aluminum worm reducer enters the heavy-duty tier of the NRV shaft-mount series — delivering up to 750 Nm of sustained output torque from a housing weighing just 13 kg. At this torque level, the NRV090 covers major belt conveyor head drives, large pump station actuators, and heavy agitator vessel drives in Australian mining ancillary, water infrastructure, and large-scale agricultural processing facilities. All of this comes without the foot bracket, shaft coupling, and alignment procedure required by foot-mount equivalents — a critical advantage when the drive is mounted on an elevated conveyor gantry or a remote pump-station platform where installation time directly translates to maintenance cost.
The NRV090 shares the same 35 mm H8 output shaft as the NMRV090 foot-mount variant, meaning both can be specified interchangeably based on mounting preference without any change to the driven equipment. With 6,800 N radial load capacity — the highest in the compact NRV series for this torque class — the NRV090 supports direct heavy chain sprocket and large V-belt sheave mounting without an outboard bearing pedestal. IEC 112B and NEMA 56C/140TC/180TC input flanges cover the full range of motors used in Australian heavy industrial and mining support applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NRV090 |
| Weight (without motor) | 13 kg |
| Gear Ratios | 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Max Output Torque (M2) | Up to 750 Nm |
| Output Speed Range | 14 – 186.7 rpm (at 1400 rpm input) |
| Max Radial Load Fr2 | Up to 6,800 N |
| Output Shaft Dia. (Metric) | 35 mm H8 |
| Output Shaft Dia. (Inch) | 1.375 in (−0.0005) |
| Keyway (output) | 10 × 38.3 mm |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Mounting Type | Shaft-mount (hollow bore) + torque arm |
| Input Options | IEC 112B / NEMA 56C, 140TC, 180TC |
| Torque Arm | K1=200 mm, 20 mm pin dia. |
| Protection Class | IP54 standard |
| Operating Temperature | -10 to +40 deg C |
Dimensional Data — Metric & Inch
| Dimension | Metric (mm) | Inch (in) |
|---|---|---|
| Output Shaft dia. | 35 mm H8 | 1.375 in |
| Keyway (output) | 10 × 38.3 mm | 0.313 × 2.0 in |
| Output Shaft Length | 70 mm | — |
| Torque Arm K1 | 200 mm | 7.87 in |
| Pin Dia. (torque arm) | 20 mm | 0.787 in |
| Max Radial Load | 6,800 N | — |
NRV090 vs. NMRV090 — Shaft-Mount vs. Foot-Mount
| Criterion | EP-NRV090 (NRV Shaft-Mount) | NMRV Foot-Mount |
|---|---|---|
| Output Torque | 750 Nm ✅ | 750 Nm |
| Mounting Method | Hollow bore on shaft ✅ | Foot bracket + coupling |
| Output Shaft Dia. | 35 mm H8 (identical) ✅ | 35 mm H8 |
| Radial Load | 6,800 N ✅ | Similar |
| Input Shaft | None (motor flange direct) ✅ | Yes (requires coupling) |
| Elevated Platform Install | No crane needed ✅ | Crane required for coupling |
Core Features & Engineering Advantages
⚙ 750 Nm — Heavy Industrial Shaft-Mount
750 Nm from a shaft-mount reducer at 13 kg covers major belt conveyor head drives that previously required heavy foot-mount gearboxes with dedicated mounting frames. For elevated drive platforms in Australian mining and port facilities, the shaft-mount configuration reduces structural steel requirements and eliminates the crane needed for coupling installation.
🔥 6,800 N Radial Load — Direct Heavy Chain Mount
The highest radial load rating in the compact NRV series for this torque class. Supports direct mounting of ANSI No. 120 and No. 140 roller chain sprockets and D-section V-belt sheaves common in major Australian agricultural processing and mining ancillary conveyor drives without an outboard bearing pedestal.
📈 35 mm Shaft — Identical to NMRV090
The NRV090 and NMRV090 share the same 35 mm output shaft diameter and keyway dimensions, allowing engineers to specify either shaft-mount or foot-mount configurations based on installation requirements without any change to the driven equipment design or bore machining.
📝 NEMA 180TC — 3.0 kW Motor Ready
Accepts NEMA 56C, 140TC, and 180TC input flanges alongside IEC 112B — covering the full range of 0.75–3.0 kW motors used in Australian heavy industrial and mining support equipment without custom adaptor fabrication.
🌞 NSF H1 Food-Grade Lubricant Option
NSF H1 registered food-grade ISO VG 220 lubricant available as factory-fill for food processing and dairy applications. Allows the NRV090 to be specified for large industrial food mixer and dairy processing vessel agitator drives where incidental food contact is possible.
Application Scenarios & Industry Suitability
⛩
Mining Conveyor Drives
Head and tail drives for belt conveyors in Australian iron ore, coal, and bauxite mining ancillary operations — 750 Nm shaft-mount handles major conveyor load without elevated-platform bracket fabrication. Unit changeout under two hours on gantry drives.
🏛
Large Pump Station Actuators
Major pump station gate actuator drives, large sluice gate operators, and penstock valve actuators in Australian water authority infrastructure — self-locking at 80:1 and 100:1 holds gate position on power loss without additional locking hardware.
⚗
Heavy Industrial Agitation
Large-diameter reactor vessel agitators, heavy polymer blending vessel drives, and large fermentation tank agitator drives — 750 Nm shaft-mount eliminates elevated-platform bracket fabrication and coupling alignment on tall vessel installations.
🏭
Large Food Processing Drives
Industrial-scale dough mixer main drives, large cheese vat agitators, and major food ingredient blending vessel drives — NSF H1 lubricant option and IP54 sealing cover food-grade processing requirements.
Selection Guide — NRV090 Ratio Selection
- Ratio 7.5–15: Higher-speed conveyor and process drives — 93–186 rpm, moderate torque.
- Ratio 20–50: Standard heavy conveyor and agitator drives — 28–70 rpm, 400–650 Nm.
- Ratio 60–100: Gate actuators and positioning drives — 14–23 rpm, self-locking, up to 750 Nm.
Shaft & Torque Arm Configuration
Output: 35 mm H8 solid shaft with 10×38.3 mm keyway and M12 threaded end. Inch: 1.375 in. Hollow bore mounts directly onto driven shaft — specify driven shaft diameter at order. Torque arm K1=200 mm, 20 mm pin. Input: IEC 112B, NEMA 56C, 140TC, or 180TC — specify at order.
Frequently Asked Questions
❓ What output torque does the NRV090 deliver?
Up to 750 Nm at 100:1 ratio — crosses into heavy-duty industrial territory. Covers major belt conveyor head drives, large pump station actuators, and heavy agitator vessel drives in Australian mining, water infrastructure, and large-scale agricultural processing facilities.
❓ What is the difference between NRV090 and NMRV090?
NRV090: shaft-mount, no input shaft, hollow bore on driven shaft, torque arm anti-rotation, no coupling needed. NMRV090: foot-mount, input shaft, requires jaw or elastic coupling. Both share the same 35 mm output shaft and 750 Nm output torque. Choose NRV090 for elevated or tight-clearance installations.
❓ What is the radial load capacity of the NRV090 output shaft?
Up to 6,800 N at 100:1 — highest in the compact NRV series for this torque class. Allows direct mounting of heavy chain sprockets and V-belt sheaves without an outboard bearing pedestal.
❓ Does the NRV090 support V-belt pulley mounting on the output shaft?
Yes — 6,800 N radial load supports direct A, B, C, and D-section V-belt pulley mounting in pump-house and irrigation drives across regional Australia.
❓ Can the NRV090 be used with food-grade lubricant?
Yes — NSF H1 food-grade ISO VG 220 synthetic lubricant available as factory-fill for food processing and dairy applications. Specify at order.
Customer Reviews
★★★★★
“Using NRV090 shaft-mount reducers on belt conveyor head drives at our iron ore handling facility near Whyalla. Shaft-mount means we can change out a failed unit in under two hours on an elevated drive platform. Thirteen months continuous, no failures.”
Brett Sullivan 🇦🇺 — Maintenance Superintendent, Iron Ore Handling, Australia
★★★★★
“Installed NRV090 on large reactor vessel agitator drives in our chemical plant in Hamburg. 750 Nm handles our high-viscosity polymer blending in 24-hour continuous operation without overheating. Shaft-mount saved significant fabrication cost on our elevated vessel platform.”
Petra Hofmann 🇩🇪 — Process Engineer, Chemical Plant, Germany
★★★★½
“Used NRV090 on pump station gate actuator drives in our water treatment plant in Ho Chi Minh City. Self-locking at 80:1 holds gate position perfectly on power loss. The 35 mm shaft matched our actuator screw bore exactly.”
Nguyen Van Thanh 🇳🇻 — Project Engineer, Water Treatment, Vietnam
Compatible Accessories & Related Products
🔌
IEC 112B Motor Adaptors
Direct motor mounting for 0.75–4.0 kW motors in 112 frame — covers standard motor sizes for Australian heavy agricultural and mining ancillary conveyor drives.
🔨
Torque Arm (K1=200 mm)
20 mm pin dia., M20 weld-on pin brackets. 200 mm arm length minimises bracket weld stress while providing secure anti-rotation for 750 Nm output torque in heavy industrial elevated-platform installations.
🔃
NRV110 Upgrade
For applications requiring over 750 Nm, the NRV110 provides up to ~1,200 Nm with a 42 mm shaft in the same shaft-mount configuration.
⚙
NMRV090 Foot-Mount Variant
Four output flanges (FA–FD), three NEMA input options (56C, 140TC, 180TC), and NSF H1 food-grade lubricant option — same torque and ratio range as NRV090 for applications where foot-mount is preferred.
Specify the EP-NRV090 for Your Heavy-Duty Drive
Application support for ratio selection, driven shaft sizing, and torque arm configuration for Australian mining, water infrastructure, and large-scale food processing OEM customers.
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