3150 Series Compact Expansion Joint
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 Series can be supplied as bellows-only components ready for fabrication or as fully welded assemblies built to your specifications.
Flex-Weld’s engineering team can integrate flanges, weld ends, or other custom connections, delivering ready-to-install solutions tailored to your system’s pressure, temperature, and movement requirements.
Features & Benefits
– Rated 150 PSI @ 70 °F for higher-pressure HVAC and industrial applications
– Multi-ply stainless-steel bellows for superior fatigue resistance and long cycle life
– Compact, short-face design simplifies installation in space-restricted systems
– Available pipe sizes 2″ – 12″ with T-321 stainless bellows and carbon-steel 150 # flanges standard
– Optional control rods and internal flow liner for added stability and velocity control
– Material options: T-304 or T-316L stainless steel construction available
– Various end configurations to fit OEM and custom assemblies — contact factory for details
– Made in the USA with no minimum order requirements and volume discounts available
Application
– High-pressure HVAC and mechanical piping systems
– OEM process equipment and fabrication assemblies
– Steam, condensate, and hot-water distribution lines
– Pump and compressor connections requiring short face– to-face expansion control
– Power generation and industrial fluid transfer systems
Markets served
– HVAC and Mechanical Contractors
– OEM Equipment Manufacturers
– Power Generation and Utilities
– Industrial and Chemical Processing
– Marine and Shipbuilding
– Building and Facilities Infrastructure
3150 Series Compact Expansion Joint Submittals (downloadable PDFs)
3150 EJ Short Submittal
Need a custom flexible metal solution?
If your system requires non-standard movement, pressure, or connection configurations, Flex-Weld engineers can design and fabricate custom expansion joints, metal bellows, and flexible hose assemblies to your exact specifications. We’ll tailor materials, end fittings, ply count, and cycle life to meet your application—whether it’s HVAC, power generation, chemical processing, or aerospace.
