Three-Jaw Pump Coupling

Three-Jaw Pump Coupling – Heavy-Duty Flexible Coupling for Pump Systems

Product Overview

The Three-Jaw Pump Coupling is a rugged elastomeric coupling specifically engineered for pump applications requiring reliable torque transmission and vibration isolation. Its unique triple-jaw interlocking design provides superior misalignment compensation while protecting pump and motor bearings from shock loads and system vibrations.

Key Engineering Features

1. Robust Three-Jaw Mechanical Design

Precision-cast ductile iron hubs (GGG50 grade) with corrosion-resistant coating

Triple-arm elastomeric spider for 120° load distribution

Progressive stiffness characteristic prevents resonance in variable speed applications

2. Advanced Elastomer Formulations

Oil-resistant NBR (standard)

Optional materials:

EPDM for high-temperature applications (up to 130°C)

FDA-compliant white polyurethane for food processing

Conductive rubber for ATEX zones

3. Pump-Specific Performance Enhancements

Axial restraint design prevents separation during water hammer events

Torsional damping reduces NPSH-related vibrations by up to 45%

Fail-safe corrosion protection with zinc-nickel plating option

Technical Specifications

Load Capacity

Torque range: 50Nm–5000Nm

Shock load capacity: 400% of rated torque

Max parallel offset: 1.5mm per 100mm diameter

Environmental Ratings

IP66 protection standard

Submersible versions available (30m depth rating)

Chemical resistance to:

Seawater

Acids (pH 2–10)

Hydrocarbons

Installation Advantages

No lubrication required

Wear indicators on elastomer element

360° access for bolt tightening

Quick-change spider replacement (under 10 minutes)

Pump-Type Compatibility

✔ Centrifugal pumps (ANSI/ISO 2858 compliant)
✔ Submersible sewage pumps
✔ High-pressure multistage pumps
✔ Slurry and dredge pumps

Certifications:

Hydraulic Institute HI 3.6 vibration standards

ABS-type approval for marine applications

WRAS approval for potable water systems

This three-jaw coupling delivers longer pump MTBF through:
→ Superior vibration damping
→ Precise shaft alignment maintenance
→ Corrosion-protected durability