Back-up Rings

Back-up rings are used for static and dynamic applications in connection with O-rings, to prevent extrusion of the O-ring into the diametrical clearance.The single cut and spiral design rings are easily installed into closed grooves while the single solid designs, recommended for highest pressures, are for installation in open grooves.
Back-up Rings
Back-up Rings

Advantages Back-up Ring

  1. Pressures above 50 bar with O-rings possible
  2. Larger diametrical clearance possible
  3. Improved stability at high temperatures and strong pressure change

Recommended when

We recommend to specify back-up rings when at least one of the following working conditions is present in cases where the intention is to seal with O-rings only:
> Pressure above 50 bar.
> Diametrical clearance exceeding 0,25 mm at p > 10 bar.
> High stroke frequency.
> High temperatures.
> Contaminated medium.
> Strong pressure pulsing or pressure changes.v

Technical Specifications

Movement Type

Dynamic reciprocating/dynamic rotating, static

Available materials

PTFE, POM, PCTFE, PU

Back-up Rings

back-up-ring-profile-t1-newdealseals-410x1024-1.jpg

PROFILE T1

For reciprocating movements

Consists as standard two spiral windings which are cut at the ends at an angle.
Compensation of large temperature changes and tolerances.

back-up-ring-profile-t2-newdealseals-424x1024-1.jpg

PROFILE T2

Preferred for internal sealing applications

Preferred for internal sealing applications when installed in closed grooves where uncut back-up rings are not suitable.
Reciprocating and rotating movements possible. Economic price level.

back-up-ring-profile-t3-newdealseals-424x1024-1.jpg

PROFILE T3

Reciprocating and rotating movements possible

A divisible groove is recommended for external sealing. Economic price level.

back-up-ring-profile-t4-newdealseals-424x1024-1.jpg

PROFILE T4

Preferred for internal sealing applications

Concave cross-section.
Reciprocating and rotating movements possible.
The large contact surface protects the O-ring against deformation in case of high pulsating pressure. Dimensional stability of the O-ring improves the sealing force and increases the service life.

back-up-ring-profile-t5-newdealseals-424x1024-1.jpg

PROFILE T5

Recommended for external sealing

Concave cross-section. Reciprocating and rotating movements possible.
The large contact surface protects the O-ring against deformation in case of high pulsating pressure.
Dimensional stability of the O-ring improves the sealing force and increases the service life.

 

 

Back-up Rings

PTFE COMPOUNDS

For our PTFE compounds we would like to direct you to our materials database.

Alternatives

  • Back-up Rings

    Spring Energized Seals

    The Synering® system is an advanced sealing concept designed to meet extreme demands regarding temperature, medium, etc. which cannot be covered by conventional sealing compounds.

    Spring Energized Seals

     

  • Back-up Rings

    Rotary Seals

    Rotary seals are used in applications with oscillating or rotating movements in order to retain liquid lubricants and to prevent the penetration of dirt and water.

    Rotary seals

  • Back-up Rings

    Rod Seals

    The Rod Seal consists of a single-acting PTFE rod sealing ring and an O-ring. They are combined as a single unit and are appropriate for rods and plungers in hydraulic cylinders.

    Rod seals

Home Products Static Seals Back-up Rings

Related
View overview ›
COMPANIES THAT CHOOSE NEWDEALSEALS
  • logo bergen.png
  • logo emerson.png
  • logo hitachi.png
  • logo hoerbiger.png
  • logo hyundai.png
  • logo kawasaki.png
  • logo man.png
  • logo philips.png
  • logo wartsila.png
Get in contact ›