Precision back-up ring BE

NBRFKM

Description
The Back-up Ring BE features a closed profile with a concave groove. Its elastic behaviour and easy assembly make it suitable for a wide range of installations. The concave profile provides excellent support to O-rings under very high and pulsating pressures.

Fields of application

• static
• dynamic
• single acting
• double acting
• linear
• rotating (inactive)
• oscillating

Main use
Protective element for elastomeric seals to prevent gap extrusion.

Materials
Elastomers

Technical values
Materials: NBR, FKM

Variant NBR

• Pressure: static up to 30 MPa; linear up to 20 MPa
• Temperature: -30°C / +80°C (material dependent)
• Speed: up to 0.5 m/s

Variant FKM

• Pressure: static up to 30 MPa; linear up to 10 MPa
• Temperature: -20°C / +200°C (material dependent)
• Speed: up to 0.5 m/s

Note
Maximum values for temperature, speed and pressure are not simultaneously applicable. Actual limits depend on material and media.

Specifications / technical data

• Commercial name: Back-up Ring BE
• Profile: closed profile with concave groove (unslotted)
• Production: injection moulding
• Standard materials: NBR, FKM (other compounds available on request)
• Main use: protection of elastomeric seals against gap extrusion
• Fields of application: static, dynamic, single acting, double acting, linear, oscillating (rotating marked inactive)
• Technical limits (NBR): pressure static up to 30 MPa / linear up to 20 MPa; temperature -30°C to +80°C; speed up to 0.5 m/s
• Technical limits (FKM): pressure static up to 30 MPa / linear up to 10 MPa; temperature -20°C to +200°C; speed up to 0.5 m/s
• Important: maximum temperature, speed and pressure values are not simultaneously applicable and depend on material and media