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JP123 Angular Expansion Joint Van Stone Flanged


Single hinged angular expansion bellows consisting of stainless steel grade 321 bellows fitted with carbon steel van stone flanges and hinge assembly drilled to BS 4504 NP16.


Stourflex single hinged angular expansion joints are used in sets of two or three and are generally installed in changes in pipework direction. They will accommodate lateral movement in only one plane. This movement occurs due to thermal expansion or contraction or building settlement. The Type JP123 is manufactured to have all stainless steel wetted surfaces and are suitable for use on non ferrous pipework installations including 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 angular 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
JP122 expansion joint

our technical specifications

Our JP123 Angular Expansion Joint Van Stone Flanged specifications

Part numberN.B. (mm)Angulation (degree)Overall length (mm)Force to angulate (N/deg)Working pressure @120°C (bar)Cold test pressure (bar)
JP123-50-16505133Available upon request1624
JP123-65-16655133Available upon request1624
JP123-80-16805133Available upon request1624
JP123-100-161005133Available upon request1624
JP123-125-161256.5199Available upon request1624
JP123-150-161506.5199Available upon request1624
JP123-200-162007212Available upon request1624
JP123-250-162507212Available upon request1624
JP123-300-163007212Available 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 JP123 are available if required.

Alternative flange drillings are available.

Stourflex angular expansion joints are supplied at their maximum overall length and must not be extended. Angular 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