Kurbo Company Limited products

Kurbo Series 20W, wide arch type expansion joints are reengineered design to improve movement and spring rate capabilities of conventional spool arch type expansion joints. Utilizing modern engineering principles and materials developed in tire industry, we create the Series 20W, new and improved design that provides great movement capability, lower spring rate with no sacrifice of strength.

Unique arrangement of spring steel wire and combined construction of bias/radial tire cord increases pressure/vacuum capability

Built -in steel flanges serve as pressure/vacuum bearing reinforcement layer, thus suitable for high pressurized pipes and vacuum service.

Buried pipelines are directly affected by the external loads produced by weight of earth, traffic load, the ground shifting created by uneven sinking of ground and earthquake. The uneven sinking between rigid structure and ground is most detrimental for underground piping. To solve such differential settlement problems, Kurbo offers underground type expansion joints in either Integrally Rubber Flanged(20UG) or Floating Flanged(30UG) varieties.

Buried pipelines are directly affected by the external loads produced by weight of earth, traffic load, the ground shifting created by uneven sinking of ground and earthquake. The uneven sinking between rigid structure and ground is most detrimental for underground piping. To solve such differential settlement problems, Kurbo offers underground type expansion joints in either Integrally Rubber Flanged (20UG) or Floating Flanged(30UG) varieties.

The heavy duty metal reinforcing rings embedded in the carcass and arch provide additional hoop strength, increasing the ability to withstand higher external and internal pressure rating.

Single expansion joint is the simplest form manufactured from single and multi-ply elements. It consists of bellows element with end connections. It is used for axial movement only in pipe configurations. However, it can also absorb small amounts of other two types of basic movements-lateral and angular. This type of expansion joint provides most economical solution in an installation where proper anchoring and guiding is feasible. Unreinforced bellows or reinforced bellows and multi-ply bellows can be designed and manufactured based on the application and design requirements,

Universal expansion joint consists of two bellows elements joined together by a piece of pipe(center spool) and fitted with either pipe ends or flanges. This type of expansion joint is usually furnished with control rods to distribute the movement between two bellows of the expansion joint and stabilize the center spool. When large amount of lateral deflection is required, universal expansion joint is used. For a given bellows element, the amount of lateral deflection capability can be increased or decreased by simply changing the length of the center spool. In addition to this, these assembly can also compensate other two types of movements: axial and angular, but is limited to low pressure applications because of center spool instability. This type of expansion joint also will result in lower forces on the anchors. Only light fixed points are required to absorb lateral movement and friction forces.

Hinged expansion joint is designed to permit angular rotation in one plane only by the use of a pair of pins through hinge plates attached to the expansion joint ends. The hinge and hinge pin is designed to restrain the pressure thrust loads and other external loads such as dead weight and wind. Slotted hinges assembly can also be provided to allow some amount of axial deflection. These slotted hinge types will not resist pressure thrust forces, and anchoring must be provided. If the full axial restraint of the hinged type is desired, the piping designer should understand that there is no allowance in the expansion joint for any axial travel, including none for any installation misalignment.

Gimbal expansion joint is designed to permit angular rotation in any plane by the use of two pairs of hinges affixed to common floating gimbal ring. This expansion joint can consist of a single bellow, where there is no lateral deflection, or two bellows connected by a common connector/pipe spool where it can permit a lateral deflection also. The gimbal ring, hinges and pins must be designed to restrain the pressure thrust loads and other external loads such as dead weight and wind.