Thorburn's single-Flex metallic bellows are specifically designed for piping or ducting applications requiring limited absorption of axial and lateral movements. Where small thermal movements are involved and proper anchoring and guiding is feasible, Thorburn's Single-Flex "SF" series expansion joint system provides the most economical installation. Single-Flex is the base member of Thorburn metal expansion joint family, consisting of a bellows element and end fittings.

Thorburn's Dual-Flex "DFU" consists of two bellows joined by a common connector called a "pipe spool". However, unlike Thorburn's double joint Model "DFP", this connector is not anchored to the structure. This permits Thorburn's unrestrained universal expansion joint "DFU" to absorb any combination of three basic movements: Axial, Lateral and Angular. Model "DFU" is used where these combinations or single direction movements are too great to be handled by Thorburn's Single-Flex single joint.

• Designed to absorb thermal movement axial, lateral & angular of the penetration pipe, caused by heating and cooling of the tubes inside the boiler or exchanger

• Improves boiler efficiency by eliminating leaks

• Eliminates leaking, noisy, gas pollution up to 700ºC

• No maintenance, designed for a minimum 6,000 shutdowns

• Available in many configurations & materials