Maximum Vibration Absorption, Longest Cycle Life, Soft Spring Rate =
Ease of Installation and Maximum Safety
Keflex™ Bellows Type Pump Connectors are designed to compensate for multi-plane axial, lateral
and angular movement in non-torsional applications. They are intended for use in both suction and
pressure lines to absorb mechanical vibrations caused by pumps, compressors, and other pipeline
equipment. Bellows Type Pump Connectors aid in compensating for minor piping misalignment.
Heavy-duty restraining rods and spacers assure protection against bellows distortion in the event
anchors are not properly secured. Keflex™ chatter-proof spacers absorb mechanical vibration without
hampering axial, lateral and angular movement of the pump connector.
Multi-ply bellows were pioneered by Keflex™. Our standard product has a minimum of four (4) plies,
but the larger diameter models are constructed with up to sixteen (16) plies. Most of the bellows type
pump connectors provided by competitors are “offshore” with only one (1) or two (2) plies.
Unlike rubber and elastomeric connectors, multi-ply laminated stainless steel bellows capsules are not
subject to premature deterioration resulting from elevated temperature conditions or UV exposure.
Thus, they offer a longer cycle life in a wide variety of temperature applications from sub-zero to
super-heated steam. In the latter case, it may be necessary to include the optional internal liner to
prevent excessive flow velocity from damaging the assembly. (Available on welded flange units only)
Standard units are designed for a total axial traverse of 5/8” (1/2” compression, 1/8” extension), a total
lateral movement of 1/8” (1/16” each side of centerline), and an angular offset of 3-1/2 degrees
maximum. Custom built assemblies are available to meet conditions beyond these specifications.
Flanged type series 150, 151, and 301-1215 assemblies from 2” to 12” ID measure a compact 5.0”
face-to-face to save valuable space. Sizes of 14” ID and up measure 9.0” face-to-face. Custom lengths
are always available.
Welded flange types 1512 and 3012 are 6” face-to-face OAL for sizes up to and equaling 8”. They are
intended as replacements for short style braided metal hose, rubber and elastomeric spool type
expansion joints. For sizes 10” and larger, the standard OAL is 8” face-to-face. Lengths other than
standard are available upon request.
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