Expansion Compensator



he heavy-duty Keflex™ 7Q Expansion Compensators are specifically designed for high pressure service, available in sizes ¾” to 4″, in both single and dual units. The single type is capable of absorbing 2″ total movement, 1 ½” in compression and ½” in extension from the factory predetermined setting. The dual type is capable of absorbing 4″ total movement, 3″ in compression and 1″ in extension from the factory pre-determined setting.

The heart of the Keflex™ 7Q Expansion Compensator is the multi-ply type 316L corrosion-resistant stainless steel bellows. These bellows are internally pressurized and operate primarily in compression where they have the greatest hoop strength capability.

The Quadra-Side® square telescoping shrouds encompass the bellows to provide protection against torsion, squirm, misalignment and external damage, as well as preventing over-compression of the bellows. Additionally, the unique design provides visual evidence that the traverse of the unit has not been exceeded. The integral guiding feature of the Quadra-Side® prevents offset to assure the pipe movement is directed axially into the bellows, a requirement for optimum performance.

The square telescopic shroud does not serve as a chamber to contain liquid or gas as do the covers on some other high pressure “compensators”. Therefore, the outside diameter of the Quadra-Side® type compensator is considerably smaller, permitting it to be installed in walls, under floors or behind radiator covers without expensive modifications at the point of installation.


Technical Data

Installation Instructions

Female NPT End Fittings – 7Q Female NPT End Fittings – 7QD
150# Flange End Fittings – 7QFL 150# Flange End Fittings – 7QFLD
Male NPT End Fittings – 7QMPT Male NPT End Fittings – 7QMPTD
Female Copper Tube End Fittings – 7QT Female Copper Tube End Fittings – 7QTD
Grooved End Fittings – 7QVG Grooved End Fittings – 7QVGD
Weld Ends – 7QWT Weld Ends – 7QWTD