Flex-Weld designs and manufactures metal expansion joints and compensators engineered to absorb movement, vibration, and thermal expansion in piping systems. Available in standard and custom configurations, our expansion joints help prevent stress, leaks, and fatigue in HVAC, power generation, and industrial process systems. Each assembly is precision-welded and tested to meet stringent performance and safety requirements. Whether you need single- or multi-ply bellows, externally pressurized joints, or universal expansion designs, Flex-Weld delivers proven reliability and long service life. Browse our catalog or contact our engineers to design a custom expansion solution for your system.
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The Keflex™ 308 and 311 Series Multi-Ply Expansion Joints represent Flex-Weld’s industry-leading solution for managing thermal expansion and vibration in piping systems. Designed and manufactured to EJMA standards, these joints feature multi-ply stainless steel bellows that provide flexibility, pressure capability, and reduced spring rates for easier installation and smoother operation. With pressure ratings from vacuum…
The Flex-Weld 30MC Series General-Purpose / Low-Pressure Expansion Joints are engineered for performance and versatility in piping systems sized 4” through 42”. Constructed with multi-ply stainless steel bellows rated for 30,000+ cycles, the 30MC Series provides reliable movement absorption and vibration isolation across a wide range of industrial and mechanical applications. Available in flanged, weld,…
The Keflex™ 3150 Series Compact Expansion Joint provides high-pressure performance in a short-length design, ideal for OEMs, repair facilities, and process equipment manufacturers. Rated up to 150 PSI, each unit utilizes 3 to 4 plies of heavy-gauge stainless steel for strength, flexibility, and fatigue resistance. Available in pipe sizes from 2″ to 12″, the 3150…
The Keflex™ 7Q Series Quadra-Side® Expansion Compensator from Flex-Weld is a heavy-duty, high-pressure solution engineered for performance and durability. Available in ¾” to 4” sizes, the 7Q’s internally pressurized, multi-ply 316L stainless steel bellows provide exceptional hoop strength and long cycle life. Its signature Quadra-Side® square telescoping shroud protects the bellows from torsion, over-compression, and…
Keflex™ Bellows-Type Pump Connectors are engineered for maximum vibration absorption, long cycle life, and safe operation in both suction and discharge lines. Constructed with multi-ply laminated stainless steel bellows—up to sixteen plies in larger diameters—they outperform rubber and elastomeric connectors that degrade under heat or UV exposure. Each assembly compensates for axial, lateral, and angular…
Flex-Weld Externally Pressurized Expansion Joints combine multi-ply stainless steel construction with a robust pressure-balanced design to ensure long-term reliability in high-pressure and high-temperature piping systems. The multi-ply configuration provides critical redundancy and safety—if one ply fails, remaining plies maintain containment until replacement. Optimized for cycle life and fatigue resistance, these joints deliver lower thrust forces…
Flex-Weld rubber expansion joints deliver proven performance in vibration absorption, noise reduction, and thermal movement compensation for industrial piping systems. Available in a wide variety of materials and configurations—from single-sphere to triple-sphere designs with floating flanges or cable ties—these joints are engineered to carry diverse media in pressure or vacuum service. Materials include Neoprene, EPDM,…
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