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:Types of expansion joints

Free type

─ Single type─

  • Free type Single type
  • Free type Single type
  • Free type Single type
  • Free type Single type
  • Free type 単式
  • ・The basic type of expansion joint. For this type, thrust generated by internal pressure is applied to the fixed points.
  • ・If high internal pressure is applied, a reinforcement ring is used to prevent deformation of the bellows. Three types of shapes are available.

Free type

─ Duplex type─

  • Free type Duplex type
  • Free type Duplex type
  • ・A duplex type can used if displacement in the direction perpendicular to the axis is large.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Outer pressure type

─ Single type─

  • Outer pressure type Single type
  • Outer pressure type Single type
  • ・This type is characterized by the structure where internal pressure of the fluid is applied in the area between the inner surface of the external cylinder and the outer circumference of the bellows.
  • ・There is no risk of buckling of the bellows even at high pressure.
  • ・A drain on the external cylinder makes it possible to easily remove accumulated liquid.

Outer pressure type

─ Duplex type─

  • Outer pressure type Duplex type
  • Outer pressure type Duplex type
  • ・This type is characterized by the structure where internal pressure of the fluid is applied in the area between the inner surface of the external cylinder and the outer circumference of the bellows.
  • ・There is no risk of buckling of the bellows even at high pressure.
  • ・A drain on the external cylinder makes it possible to easily remove accumulated liquid.

Hinge type

  • Hinge type
  • Hinge type
  • ・This type can absorb angular displacement on a plane.
  • ・It is designed to restrain the thrust generated by internal pressure by a hinge pin, thus applying no thrust at fixed points.
  • ・By combining two to four items on a plane, this product can absorb displacement in the axial direction.
  • ・As the number of items combined is increased, the product can absorb greater displacement.
  • ・Moreover, by combining a gimbal type with this type, it becomes possible to absorb displacement not only in the axial direction but also in the direction perpendicular to the axis in all directions.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Gimbal type

  • Gimbal type
  • Gimbal type
  • ・This type can absorb angular displacement in all directions.
  • ・It is designed to restrain the thrust generated by internal pressure using a gimbal pin, thus applying no thrust at fixed points.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Universal type

  • Universal type
  • Universal type
  • ・This product is the application of the basic duplex type and is equipped with extension bolts that restrain extension in the axial direction. This eliminates thrust applied at fixed points.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Non-welded type

  • Non-welded type
  • Non-welded type
  • ・This product adopts a structure where the bellows tip is folded back in the shape of a collar to attach the bellows to the flange without welding. For this reason, all wetted parts are made of stainless steel.

Straight pipe pressure balanced type

  • Straight pipe pressure balanced type
  • Straight pipe pressure balanced type
  • ・A balance bellows is inserted and connected between two displacement bellows to offset the thrust generated by internal pressure in the expansion joint. This eliminates the thrust applied at fixed points.
  • ・The outer diameter of the balance bellows is required to be about 1.4 times that of the displacement bellows, which makes the maximum outer diameter of the entire expansion joint larger.
  • ・Absorption of displacement in the direction perpendicular to the axis is also enabled by adopting a duplex-type displacement bellows.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Curved pipe pressure balanced type

  • Curved pipe pressure balanced type
  • Curved pipe pressure balanced type
  • ・By connecting a displacement bellows placed at the elbow of the curved pipe and a balance bellows placed behind the elbow, the static thrust generated by internal pressure is offset in the expansion joint. This eliminates the static thrust applied at fixed points.
  • ・The balance bellow sticks out from the piping system.
  • ・Absorption of displacement in the direction perpendicular to the axis is also enabled by adopting a duplex-type displacement bellows.
  • ・If high internal pressure is applied, a reinforcement ring can be used to prevent deformation of the bellows.

Square type

─ Exhaust air duct ─

  • Square type Exhaust air duct
  • Square type Exhaust air duct
Accordion corner
Accordion corner
Round corner
Round corner
Frame corner
Frame corner
  • ・With the cross section especially designed for use with square ducts, this product is suited for a large volume of gas flow at low pressure.
  • ・A duplex type can be used if displacement in the direction perpendicular to the axis is large.
  • ・The thrust generated by internal pressure is applied at fixed points.
  • ・Three types of shapes are available for the corner part.

Square type

─ For thermal power generation boilers─

  • 角型 火力発電ボイラ用
  • 角型 火力発電ボイラ用
Round corner
Round corner
  • ・This type is used for flue ducts and supports large diameter exceeding 10 m.
  • ・A duplex type combining two units of this type and an intermediate duct can be used if displacement in the direction perpendicular to the axis is large.
  • ・A heat-retention fitting is attached on the circumference.

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