WUXI TRUMY High Shock Absorption Pump Coupling with 5000 Nm Torque Capacity and Low Maintenance
Price:
Negotiable
MOQ:
Negotiable
Delivery Time:
Negotiable
Brand:
WUXI TRUMY
Product Description
WUXI TRUMY Wear Resistant Pump Coupling
WUXI TRUMY ZL / HL Elastic Pin Coupling - Pump Shaft Coupling Specification, Supply & Support
About Dongguan HydroBlue Co., Ltd.
DONGGUAN HydroBlue CO.,LTD. is a client-focused technical enterprise offering end-to-end solutions in fluid machinery, fluid engineering, industrial automation, and frequency conversion technologies. Our 8-person technical team covers fluid engineering, electrical engineering, and electronic engineering disciplines, enabling us to translate R&D capabilities into reliable commercial products.
Alliances with Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology strengthen our expertise in hydraulic systems, specialized coatings, and industrial control technologies.
WUXI TRUMY ZL / HL elastic pin & bush coupling -- product photo placeholder
Attach your pump model and coupling requirements to your inquiry -- our engineering team will verify specifications and provide a competitive quotation within 24 hours.
Product Overview
The WUXI TRUMY ZL / HL Elastic Pin & Bush Coupling is a flexible shaft coupling commonly used to connect pump and motor drive shafts in water supply, wastewater treatment, HVAC, and general industrial systems. It transmits torque through elastomeric bushings mounted on steel pins, which allows the coupling to absorb small amounts of shaft misalignment and dampen vibration during operation.
WUXI TRUMY is a Chinese manufacturer specializing in mechanical power transmission components, and the ZL (LX-type) and HL (HLL-type) elastic pin couplings are among the most widely specified models for centrifugal pump drives in the domestic market. The design is straightforward to install and service: the flexible element is typically the only wearable part, so routine maintenance usually means inspecting and replacing the bushings rather than the whole coupling.
For most standard pump duties the elastic pin coupling is a practical choice, though it is not suited to every application. High-speed or high-temperature drives generally call for an alternative design such as a gear or spring-plate coupling, and the right type should be confirmed against the actual pump duty.
ZL / HL Model Specification (Reference Values)
The table below lists typical ZL-series ratings as a starting reference. Values vary by model and manufacturer revision, and the exact figures for a given pump should be confirmed before ordering.
| Model | Rated Torque (Nm) | Bore Range (mm) | Max Speed (RPM) | Typical Pump Duty |
|---|---|---|---|---|
| ZL1 | 100 | 12 - 32 | 4,750 | Small booster, circulation pump |
| ZL2 | 250 | 16 - 45 | 4,000 | Small clean-water pump |
| ZL3 | 500 | 20 - 55 | 3,550 | End-suction centrifugal pump |
| ZL4 | 900 | 28 - 65 | 3,150 | General water / HVAC pump |
| ZL5 | 1,400 | 32 - 80 | 2,800 | Process water pump |
| ZL6 | 2,650 | 40 - 95 | 2,500 | Wastewater transfer pump |
| ZL7 | 4,000 | 45 - 110 | 2,200 | Medium industrial pump |
| ZL8 | 6,300 | 55 - 125 | 1,900 | Large water pump |
| ZL9 | 9,000 | 60 - 145 | 1,700 | Municipal pump station |
| ZL10 | 14,000 | 70 - 165 | 1,500 | High-flow pump set |
| ZL11 | 20,000 | 80 - 185 | 1,300 | Large process pump |
| ZL12 | 28,000 | 90 - 200 | 1,150 | Heavy-duty pump drive |
| ZL13 | 40,000 | 110 - 220 | 1,000 | Big turbine / transfer pump |
Coupling Selection & Sizing
- Determine Pump Power & Speed -- Calculate nominal torque: Tn = 9550 × P(kW) / n(RPM). A 37 kW pump running at 1480 RPM gives Tn ≈ 239 Nm.
- Apply Service Factor K -- Centrifugal pumps: 1.2-1.5 (clean water), 1.5-2.0 (slurry). Screw / PCP pumps: 2.0-2.5. Reciprocating pumps: 3.0-4.0. Design torque Tc = Tn × K.
- Match Model by Torque -- Select a model whose rated torque comfortably exceeds Tc. For a 239 Nm design torque, a ZL4 (900 Nm) typically leaves adequate margin.
- Verify Bore & Keyway -- Confirm the model can cover both motor and pump shaft diameters; custom boring is usually available to match existing shafts.
- Check Speed Limit -- The selected model's maximum RPM should exceed the pump operating speed with a reasonable margin.
- Consider Environment -- For pump rooms above ~80°C or with aggressive fumes, standard elastomeric bushes may degrade faster; discuss an alternative material or coupling type with our team.
Installation & Alignment
Correct installation has a strong influence on coupling life. The steps below are a general guide and should be read together with the pump maker's instructions.
- Clean the shaft ends -- Remove rust, oil, and burrs from the motor and pump shafts so the hubs seat fully.
- Fit the hubs -- Mount each hub to the correct shaft with the key seated; avoid hammering directly on the hub face.
- Rough-align the shafts -- Bring motor and pump shaft centre-lines close using straight-edge and feeler checks before final tightening.
- Measure offset & angular error -- Use a dial indicator or laser alignment tool; keep misalignment within the coupling's rated tolerance.
- Insert the bushes & pins -- Assemble the flexible element so pins pass through the bushings without forcing; uneven compression usually signals residual misalignment.
- Re-check after running-in -- After a short trial run, re-check temperatures and vibration; a warm coupling often points to residual misalignment.
Why Choose WUXI TRUMY Couplings from HydroBlue
- Proven Design -- The ZL / HL elastic pin coupling is a mature, widely used design for standard pump drives.
- Standard Compliant -- Manufactured to GB/T 4323 (elastic pin coupling) and related national standards.
- Custom Boring -- Supplied with bore and keyway matched to your existing motor and pump shafts, reducing on-site work.
- Balanced Before Dispatch -- Each assembly is balanced per ISO 1940 G6.3 as standard; G2.5 available for higher-speed duties.
- Readily Serviced -- The flexible bush is usually the only consumable part, so field service tends to be simple and low-cost.
Frequently Asked Questions
Q: Can WUXI TRUMY couplings replace an existing coupling on my pump?
A: In many cases yes, provided the torque, bore, and speed ratings match. Send us the current coupling photo, model tag, or shaft dimensions and we will confirm the closest ZL / HL fit.
Q: How long do the elastomeric bushes typically last?
A: Service life varies with misalignment, load, and temperature. Under good alignment and normal duty they often run for a long period; in hot or slurry service they may need earlier replacement. Regular inspection is the best guide.
Q: Do you supply the coupling with the bushes already fitted?
A: Couplings are usually supplied as a kit (hubs, pins, bushes) and can be delivered pre-bored to your shaft sizes. Spare bush sets are available separately for quick field service.
Q: What if my pump runs above the elastic pin coupling speed limit?
A: We can advise on a gear or spring-plate alternative from the WUXI TRUMY range. Share the RPM and torque so we can suggest a suitable type.
Get a Quotation
Send your pump model, motor power, speed, and shaft diameters, and our engineering team will confirm the correct WUXI TRUMY ZL / HL model and return a quotation, typically within 24 hours.
Attach your pump model and coupling requirements to your inquiry -- our engineering team will verify specifications and provide a competitive quotation within 24 hours.
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Company
Dongguan HydroBlue Co., Ltd.
Location
Room 1904, Building 1, Zhongtang Tianan Digital City, No.89 Jinyuan Road, Zhongtang Town,Dongguan City, Guangdong Province, China.
Contact Person
Jack