Rectangular Metal Expansion Joint for High Temperature & Pressure Duct
Our rectangular metal bellows expansion joint, also known as rectangular metallic compensator, is a flexible component specially designed for rectangular ductwork, flue gas pipelines, hot air systems, exhaust and ventilation piping. It is constructed from high-quality thin-walled metallic bellows, combined with end frames, tie rods, limit bars, gaskets and other auxiliary parts as required.
The core bellows element is precision formed by hydraulic or mechanical forming process, which enables the joint to absorb multi-directional displacements generated during system operation, including axial compression and extension, lateral offset as well as angular rotation. When the duct system heats up and expands or cools down and contracts, the bellows will deform flexibly to compensate such movements, so as to release excessive thermal stress on pipelines, fans, boilers, dust collectors and other connected equipment. Besides thermal displacement compensation, this expansion joint can also isolate mechanical vibration transmitted from fans and other rotating equipment, buffer installation misalignment caused by construction errors, and reduce structure-borne noise transfer along the duct.
We support fully customized solutions to fit different service environments. Multiple material options are available for bellows: 304, 316L, 321, 310S stainless steel for high temperature or corrosive medium; carbon steel Q235-A for normal temperature clean air conditions. End frames can be carbon steel or stainless steel according to customer demand. It can be supplied with flanged connection or welded end connection to match your duct interface. Tie rod assemblies and limit devices are optional accessories, which are used to restrain over-travel displacement and bear pressure thrust, preventing the bellows from over-stretching or over-compressing under abnormal working conditions.
This rectangular metal expansion joint is widely applied in industries such as power plants, steel mills, cement plants, waste incineration plants, chemical factories and heating projects. It works steadily in flue gas, high-temperature hot air, exhaust gas and low-corrosion gas medium. Products are manufactured in compliance with GB/T 12777 and EJMA standards. Each unit will go through strict inspection, including dimension checking, visual surface inspection and leak test before delivery, to guarantee tightness and service safety.
Compared with non-metallic fabric expansion joints, our metal type features excellent high temperature resistance, anti-aging performance and longer service life. It will not suffer from aging, cracking or air leakage easily under continuous high-temperature working conditions. Our technical team can confirm the bellows quantity, wall thickness, overall size and accessory configuration based on your working parameters including design pressure, operating temperature, medium, displacement requirement and installation space. All technical drawings and calculation sheets can be provided for confirmation before production.
We accept small trial orders and bulk orders. Technical support is available during quotation, design, production and after shipment. All products can be supplied with required certificates such as CO, ISO, SGS test report upon request.
