Product Introduction

This double sphere threaded rubber expansion joint (threaded flexible rubber joint / vibration isolator) is designed for small-diameter piping systems. It adopts stainless steel union female thread connection, no welding required for quick installation. The reinforced rubber body with nylon cord fabric inside provides excellent elasticity, vibration damping and noise reduction performance. It can compensate axial, lateral and angular displacement caused by thermal expansion, installation misalignment and water hammer, to protect pumps, valves and pipelines from mechanical stress.

Application

HVAC fan coil, water pump, solar water system, heating pipeline, domestic water supply, small industrial circulating water system.

Advantages

✅ Fast threaded union installation

✅ Good vibration isolation & noise reduction 

✅ Multi-direction displacement compensation 

✅ Compact structure for narrow space

✅ OEM & custom length available

Material Options

• Rubber Body: EPDM (hot water & weak acid-alkali), NBR (oil medium), NR (general water)

• Union Nut: SS304 / SS316 stainless steel

• Reinforcement Layer: Multi-layer nylon cord fabric

Technical Data

• Size: DN15 ~ DN80 (1/2" ~ 3")

• Pressure Class: PN16 (1.6 MPa)

• Working Temperature: -15℃ ~ +115℃

• Thread Standard: BSPP / BSPT / NPT optional

• Medium: Clean water, air, weak acid & alkali, oil (select rubber accordingly)

All valves are equipped with professional export protective packaging. 

With protective caps on the sealing surfaces, rust-proof treatment, and shock-absorbing material filling to ensure intact transport; the loading is secure and safe. 

We can also customize packaging according to customer requirements.

Regarding transportation methods, we can provide appropriate transportation options based on the cargo requirements and the customer's timeliness requirements. 

Common transportation methods include: sea freight, air freight, land freight, and express delivery.