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If the pressure then increases repeatedly, permanent damage or even complete destruction of the O-rings can occur.
Back-up rings are used to prevent gap extrusion. Although back-up rings do not perform a sealing function, they support the permanent and damage-free sealing function of the O-rings by closing the sealing gap on the side facing away from the pressure.
Furthermore, parameters such as operating temperature, gap height and resistance to the ambient medium play a decisive role in the material selection of the back-up rings.
Plastics and elastomers such as PTFE, polyurethane or NBR, FPM and EPDM come into question for the bck-up rings.
In wider installation spaces, the back-up rings are usually mounted on the side facing away from the pressure.
If back-up rings from existing dimension series, such as NBR 90, are used, the design of the installation space must be in accordance with the manufacturer's specifications.
ttv will be pleased to advise you on all questions concerning the selection and installation of suitable back-up rings.
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