Flanges
We have different types of flanges and couplings available as standard.
A hose with straight ends can be connected in many ways. However, this type of connection is only suitable for low pressure application. One disadvantage is that when it is fitted in the pipe, it obstructs the flow through the hose. But, at low speeds, the turbulence caused by this is of secondary importance.
A hose with collars does not have this disadvantage. The end is widened so that the connector does not obstruct the flow when inserted. However, hoses with collars should only be used for low pressure applications.
This flange is used for suction hoses for medium pressure application. The rubber flange means that the hose can remain relatively short, starting from a maximum angle of curvature. And because the wear layer rubber extends partly into the top edge of the flange, it forms a good seal with the flange connection itself.
Proper sealing at higher pressures is one of the main advantages of this flange system. The integrated steel insert flange at the flange face keeps the flange connection tight even at higher axial loads and pressures. It also protects the flange from damage due to raised face flange edges. In many occasions, this flange is a cost effective alternative to the Double Action® flange or laminated flange.
Trelleborg's solid steel couplings are suitable for very heavy-duty applications. They can be made with the smallest possible pitch circle diameters and are vulcanized into the hose. These couplings are also secured with our safety strap system for extra safety. Trelleborg uses these couplings as standard types for our self-floating hoses to allow work during bad weather without the risk of a defective line.
The Double Action® flange is Trelleborg's most recent development. The main feature of this flange is the superior axial strength due to integrated locking flange. This flange is able to accept high bending loads due to thick integrated flange and backing flange and will not fall apart due to rust. Thick integrated flange and backing flange allow for a large radius in flange neck, no cutting forces on the cords.
| The Double Action® flange comes in two designs: |
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| Plain Double Action® flange |
Double Action® flange with steel gasket |
The latter gives even better sealing at high pressures and offers protection to the reinforcement cords when mounted to sharp edged raised face flanges. This type of flange is recommended for applications where a very short hose is needed with a relatively big angle of curvature and a high working pressure.
The swivel flange is used with medium service pressures at points where the bolt holes in the mounting flanges are not precisely aligned. The swivel flange simplifies fitting between 2 fixed points.
The laminated flange can be used in circumstances where a relatively high compressive strength is required and where vulcanized couplings cannot be used. Also, to be used at service pressures of 10 bar and higher axial loads.