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PTFE back-up rings are used to prevent gap extrusion (gap migration) of O-rings or WX-rings at high pressures, and thus to prevent damage to the elastomer sealing elements. Especially when used dynamically without a support ring, gap extrusion with simultaneous movement of the metal components leads to immediate damage to the sealing surfaces. But pulsating pressures with static sealing also have the same effect. Slotted and spiral designs can be easily inserted into a closed groove, whereas an open (divisible) installation space should preferably be provided for endless designs. For high and pulsating pressures we recommend endless designs.
can be used with almost all media
Standard materials: various PTFE compounds, polyamides and polyurethanes
To avoid damage, the sealing elements must not be pulled over sharp edges or threads. With slotted versions the sealing element should be fitted first, followed by the back-up ring. With closed versions, the support ring should normally be fitted first, followed by the sealing element. The dimensions of the installation spaces are to be carried out according to the table below. In order to ensure proper function, the groove width must be considerably larger than all mounted support rings and sealing elements before the piston rod or piston is mounted in the cylinder barrel. The elements must therefore not already be laterally braced before their final assembly.
in conjunction with O-rings and WX-rings to prevent gap extrusion
Do you need support in selecting the right O-rings and back-up rings or do you have any questions? We will be happy to help you directly!