Control Unit Integrated Type (Developed by Kyokuto Rubber) / Rubber Expansion Joints


In plant piping, a thrust may occur due to reasons such as internal pressure, which tries to move the piping. This thrust serves as a force that tries to extend the expansion joint; therefore, a device (control unit) may be installed on the rubber expansion joint to prevent excess extension. At Kyokuto Rubber, we install a control unit usually referred to as a “Back-plate Type”. A recent trend in plant piping, however, has been to utilize FRP piping. If a back-plate-type control unit is installed on the FRP flange of the FRP piping, it can cause the FRP flange to crush when considerable thrust occurs. The integrated type is a rubber expansion joint designed and manufactured to be safely used even when the piping used in a plant is FRP piping. The control unit integrated type does not allow thrust to occur in the way that a back-plate type control unit may, therefore preventing the FRP flange from crushing.

  • Thrust does not occur against the opposing flange because of the control unit, thus preventing the flange from being destroyed.
  • It is installable on equipment, such as valves and pumps, where the plate for a control unit to cannot be installed on.
  • As it can be mounted after being connected to the opposing piping, the control unit can be mounted easily compared with the control unit on the back plate side.


Kyokuto Rubber Co., Ltd.
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