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JP120 Lateral Expansion Joint Flanged

Now Available With Precision Fit Flexible Lagging Jackets To Suit JP120.


Double tied lateral expansion joint consisting of two stainless steel grade 321 bellows welded to carbon steel centre tube fitted with carbon steel oval flanges and tie bar assembly drilled to BS 4504 NP16.


Stourflex double tied expansion joints are generally installed in changes in pipework direction and will accommodate lateral movement in one or two planes. This movement occurs due to thermal expansion or contraction or building settlement. They are suitable for use on L.T.H.W., M.T.H.W. , H.T.H.W., Steam and other hot liquids and gases.

  • Maximum working temperature 300ºC.
  • Maximum working Pressure 16 bar at 120ºC.
  • Stourflex lateral expansion joints should not be used at both their maximum working temperature and pressure respectively.
  • Maximum test pressure = 1.5 x working pressure or 1.5 x flange rating whichever the lower.


Stourflex are now able to offer a tailor made flexible lagging jacket to help reduce heat losses on LTHW systems and heat gains & condensation on CHW systems. Please ask for pricing or more information.

Download data sheet
JP120 expansion joint

our technical specifications

Our JP120 Lateral Expansion Joint Flanged specifications

Part numberN.B. (mm)Total movement (+/-)Overall length (mm)Lateral spring rate (N/mm)Working pressure @120°C (bar)Cold test pressure (bar)
JP120-40-164050750Available upon request1624
JP120-50-165050750Available upon request1624
JP120-65-166550750Available upon request1624
JP120-80-168050850Available upon request1624
JP120-100-1610050850Available upon request1624
JP120-125-1612550950Available upon request1624
JP120-150-1615050950Available upon request1624
JP120-200-1620050950Available upon request1624
JP120-250-16250501050Available upon request1624
JP120-300-16300501050Available upon request1624

Stainless steel grade 321 internal flow sleeve fitted as standard.

Where service conditions above 300ºC or 16 bar exist or where additional movement is required non standard variations of the Type JP120 are available on request.

Alternative flange materials and specifications are available on request.

Stourflex lateral expansion joints are supplied at their maximum overall length and must not be extended. Lateral expansion joints must be securely anchored and adequately guided to ensure their correct performance. Omitting anchors and guides may result in failure of the system.

All Stourflex products should be installed in accordance with our fitting instructions.

Download data sheet