7Q Series Quadra-Side® Expansion Compensator
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 external damage while maintaining perfect axial movement. This design also provides visual movement indication and allows installation in tight spaces—such as walls or beneath floors—without modification. Offered in single or dual configurations, the 7Q can absorb up to 4 inches of total movement, making it ideal for high-pressure HVAC, hydronic, and mechanical systems that demand compact, reliable expansion compensation.
Features & Benefits
Square Telescoping Shroud
– Prevents torsion, squirm, misalignment, & external damage
Removable Set Pin
– Provides optimum positioning for installation
Multi-ply 316L Stainless Steel Bellows
– Provides Lower Actuation Force & Longer Cycle Life
Variety of Standard End Fittings
– Meets Most Installation Requirements
Internal Guide
– Prevents offset and assures pipe movement is directed axially
Small Size
– Easy Installation in walls, under floors, or behind radiator covers
Applications
– Water and Steam Piping Systems
– Hydronic Heating and Cooling Lines
– Hot Water and Radiator Piping
– HVAC System Risers
– Building Service Piping
– Condensate Return and Pump Discharge Lines
Markets Served
– Commercial and Institutional Buildings
– HVAC and Mechanical Contractors
– OEM Equipment Manufacturers
– Plumbing and Hydronic System Installers
– Power and Utility Infrastructure
– Facility Maintenance and Retrofit Projects
7Q Series Submittals (downloadable PDFs)
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.
