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| Categories | REXNORD OMEGA Coupling |
|---|---|
| Torque: | 62-6500 |
| Pump Model.: | Mc/MD/G Sg/CD8/Bbtd/Msd/Mca/Mce/Mcv |
| Material 2: | Stainless Steel, Duplex Ss, Cast Alloy Steel |
| Type: | Coupling |
| Material Standard: | ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct |
| Certificate: | ISO9001:2015, ISO14001:2004, API Specification Q1 |
| Material: | Carbon Steel+Plastic |
| Material 1: | Cast Iron, Wear-Resistant Cast Iron, Cast Steel |
| Pump Model: | APP/Wpp/EPP/Aup/Zpp/CPT/Ohhl |
| Types of Welding Parts: | OEM/ODM |
| MOQ: | 1 |
| Price: | 35 |
| Specification: | According to the drawings |
| Bore Diameter: | 10-165 |
| Model NO.: | Coupling |
| Transport Package: | Carton and Wooden Cases |
| Production Capacity: | 10, 000 Tons Per Year |
| Structure: | Flexible |
| Pump Package: | Carton and Wooden Cases |
| Mould: | Investment Casting Mould, Sand Casting Mould |
| Speed: | 1000-5400 |
| Origin: | China |
| Testing: | Dynamic Balancing |
| HS Code: | 84139100 |
| Company Info. |
| Dongguan HydroBlue Co., Ltd. |
| Verified Supplier |
| View Contact Details |
| Product List |
Dongguan HydroBlue Co., Ltd. supplies replacement couplings and coupling components for REXNORD pump drive applications, covering grid, jaw, disc, and gear coupling types for centrifugal, progressive cavity, and positive displacement pumps. Our eight-person engineering team covers mechanical power transmission, elastomer material science, and dynamic balancing, with research collaborations at Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology. We also supply complete pump spares, mechanical seal assemblies, VFD cabinets, motor control enclosures, and provide overseas field engineering support including laser alignment and on-site commissioning.
Send us your pump model and coupling shaft sizes for a specification check and quotation.
A pump coupling connects the driver shaft to the pump shaft while accommodating unavoidable misalignment from thermal expansion, foundation settling, and manufacturing tolerances. Even a perfectly aligned pump at cold start will shift as the casing and piping heat up. The coupling's flex element (grid spring, elastomer spider, disc pack, or gear teeth) must absorb this movement without imposing excessive reaction forces on the bearings.
When the coupling is forced to operate beyond its misalignment capacity:
Coupling Type | Angular Misalignment | Parallel Offset | Axial Float | Torsional Stiffness |
|---|---|---|---|---|
Grid coupling | ±1.5° | 0.5 mm | Moderate (spring grid provides inherent torsional damping) | |
Jaw coupling (NBR spider) | ±1.0° | 0.3 mm | ±1.5 mm | Low (soft spider absorbs torsional vibration) |
Disc coupling | ±0.5° | 0.2 mm | ±1.0 mm | High (steel disc pack, minimal wind-up) |
Gear coupling | ±1.0° | 0.4 mm | ±2.0 mm | High (steel-on-steel through crowned teeth) |
Flex Element Type | Normal Wear Pattern | Abnormal Wear (Root Cause) |
|---|---|---|
Grid spring | Surface fretting at spring-hub contact point; slight reduction in spring cross-section over long service. Replace when cross-section has reduced by 20% | Broken spring segments near the hub slot → excessive angular misalignment or torsional overload. Grooving on spring sides → lack of grease in the housing |
Elastomer spider | Surface cracking on the spider arm between the hub legs after 2–3 years. The spider becomes slightly stiffer from material ageing | Radial cracks from the hub leg contact area inward → misalignment exceeds design limit. Material melted on contact surface → pump operating near coupling temperature limit (NBR: 80°C, Hytrel: 120°C, FKM: 200°C) |
Disc pack (stainless steel) | Minimal visible wear. Some surface discolouration from cyclic flexing. Replace based on service hours (50 000–80 000 hours typical) | Crack at bolt hole edge → torque overload or bolt loosening causing uneven load distribution. Delamination between laminates → excessive parallel misalignment causing out-of-plane buckling |
Gear teeth | Polishing of tooth flank contact area. Even wear across the crowned profile is normal. Measure backlash; replace when backlash exceeds 2× original value | Tooth tip loading (wear concentrated at tooth tip or root) → angular misalignment beyond the crowned profile capacity. Pitting on tooth flank → inadequate lubrication or abrasive contamination in grease |
Material | Temperature Range | Damping | Oil / Chemical Resistance | Best For |
|---|---|---|---|---|
NBR (standard rubber) | −30 to +80 °C | Good | Good oil resistance; poor ozone/UV | General pump service, water, sewage, standard motor-driven |
Hytrel (polyester elastomer) | −40 to +120 °C | Moderate | Excellent oil, fuel, chemical resistance | Higher temp, chemical process pumps, continuous duty |
Urethane | −30 to +90 °C | Good | Excellent abrasion resistance; moderate oil resistance | Abrasive environments, start-stop cycling, shock loads |
FKM (Viton fluoroelastomer) | −20 to +200 °C | Low | Excellent chemical, acid, solvent resistance | High-temp process, aggressive chemical, steam service |
Q1: How do I know which REXNORD coupling type my pump needs?
Check the existing coupling nameplate or the pump maintenance manual. If the coupling is not marked, the general rule: grid couplings for medium-to-high torque centrifugal pumps; jaw couplings for small, light-duty pumps; disc couplings for high-speed or API pumps; gear couplings for large, heavy-duty or high-torque pumps. We can also identify the type from a photograph of the coupling assembly.
Q2: How often should the flex element be replaced?
NBR spiders: every 2–3 years in continuous service; inspect annually for cracking. Grid springs: replace only when spring cross-section has reduced by 20% or broken segments are found. Disc packs: replace at 50 000–80 000 operating hours or if fatigue cracks appear. Gear couplings: inspect tooth condition at every major overhaul; typical gear element life is 5–10 years in clean, lubricated service.
Q3: Can I replace only the flex element without changing the hubs?
Yes, for all four coupling types. The hubs and sleeves are reusable as long as the bores, keyways, and hub leg profiles are not damaged. We stock common-size spiders, grid springs, disc packs, and gear ring sets for this purpose. Retaining the original hubs avoids the cost of re-boring and saves downtime.
Q4: What causes coupling vibration that was not present before?
Most common causes: a damaged or worn flex element; pump or motor shaft alignment has drifted from thermal growth or foundation movement; a loose hub on the shaft (keyway wear or loose set screw); balance degradation from uneven wear or material build-up on the coupling. A dial indicator check of angular and parallel alignment is the first diagnostic step.
Q5: What warranty applies?
12 months from commissioning or 18 months from shipment. Covers material and manufacturing defects including elastomer compound integrity, hub metallurgy, and disc pack laminate bonding. Wear from misalignment beyond rated capacity, lubrication starvation (gear/grid), or chemical attack on the elastomer is excluded as application-dependent.
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