Rubber Expansion Joint – Cangzhou Huairong Pipeline Equipment Co., Ltd.

PRODUCT PARAMETERS

The Rubber Expansion Joint (also known as Flexible Rubber Joint or Rubber Bellow Joint) is a key flexible connecting component in a piping system, consisting of a rubber sphere body combined with flanges at both ends.

Its core functions include compensating for axial, lateral, and angular displacements caused by thermal expansion/contraction or foundation settlement, efficiently absorbing vibration and noise generated by equipment such as pumps and fans, and protecting the piping system, flange connections, and terminal equipment. It is an indispensable shock absorption and compensation part in industrial and municipal pipelines.

Application Fields: Widely used in petroleum & petrochemical, oil & gas transportation, power and energy, metallurgy & shipbuilding, pharmaceutical & food, municipal engineering, HVAC heating systems, and wastewater treatment industries. Suitable for conveying water, wastewater, steam, petroleum products, gases, weak acids, and weak alkalis, meeting the requirements of medium/low pressure, frequent vibration, and large installation deviation conditions.

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Description

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Description

Item	Specification
Product Size	DN25–DN1200 (1″ – 48″) and other standard sizes; large-diameter customization available
Pressure Rating	PN6–PN40 / Class 150, Class 300 (higher pressure ratings can be customized as required)
Manufacturing Standard	Conforms to GB, ANSI, DIN, JIS and other international standards
Material	Flange: carbon steel, stainless steel, alloy steel; Rubber: natural rubber, NBR, FKM, EPDM, etc.; Metal reinforcement layer (e.g. steel wire braided layer or steel plate reinforced layer)
Surface Treatment	Flange: pickling & passivation, anti-rust oil coating, painting, hot-dip galvanizing, sandblasting, etc.; Rubber ball: natural rubber color, customized colors, etc. (as per customer requirements)
Origin	China
Connection Type	Flanged connection
Temperature Range	-20°C ~ +150°C (depending on rubber type and working conditions; some high-temperature models up to +250°C)

FAQs

Are you a manufacturer or a trading company?

Can you manufacture customized flanges and pipe fittings?

Yes. In addition to standard products, we provide customized flanges and pipe fittings according to customers’ drawings, technical specifications, material requirements, dimensions, pressure ratings, surface treatments, and application conditions. Our production facilities support forging, pressing, machining, cold forming, hot extrusion, heat treatment, and other manufacturing processes.