Rubber Expansion Joint (Flanged Type) | Vibration Isolation & Pipe Movement Absorption

The Rubber Expansion Joint (flanged type) is a flexible connector used in piping systems to absorb vibration, reduce noise, and compensate for minor pipe movement. The joint consists of a multi-arch rubber body (typically 2 to 5 arches) reinforced with multiple layers of nylon or polyester tire cord and a steel wire ring at each arch. The rubber body is vulcanized to integral loose flanges or fixed flanges on each end. When installed between two flanges, the joint can compress (axially), extend, bend (angular), or shift (laterally) to accommodate pipe misalignment or thermal movement. The joint also isolates vibration from pumps, compressors, and other rotating equipment — preventing that vibration from traveling down the pipe and radiating as noise. The rubber material is selected based on the fluid: EPDM for hot water and sewage; NBR for oil and fuel; Natural rubber for abrasion resistance (slurry). Control rods (tie rods) are available to limit axial movement and protect the joint from over-extension during pressure surges.

Why Choose Us / Advantage

High Strength Reinforcement: Multiple layers of nylon tire cord — pressure rating up to 16 bar.

Vibration Reduction: Up to 80% vibration isolation compared to rigid pipe.

Corrosion Proof: Rubber body never rusts — ideal for saltwater and chemical service.

Easy Installation: Lightweight and flexible — no heavy lifting or precision alignment required.

Quick Lead Time: Standard sizes (DN50-DN600) from stock or 10-15 days.

Technical Data

★ Specification Standard High Pressure

★ Rubber Material EPDM / NBR / Natural rubber EPDM / NBR

★ Reinforcement Nylon/polyester cord (2-6 layers) Nylon cord + steel wire ring

★ Pressure Rating PN6 / PN10 PN16 / PN25

★ Temperature -20°C to +110°C (EPDM) -20°C to +110°C

★ Size Range DN25 – DN1000 (1″ – 40″) DN25 – DN600

★ Axial Movement ±15mm to ±40mm (size dependent) ±10mm to ±25mm

★ Connection Flanged (EN / ANSI / BS / JIS) Flanged

★ Control Rods Optional Recommended

Applications

● Pump suction and discharge connections (vibration isolation)

● HVAC chilled water and hot water pumps

● Cooling tower piping (absorbs pump vibration)

● Sewage pump stations (reduces noise)

● Marine engine room piping (vibration and noise reduction)

● Industrial process lines connecting rotating equipment