CUP SEAL METRIC

Back-up Rings are pure hard rubber piece with concave on one side relative to the o-ring shape, having no intended sealing function. Instead, as their name indicates, they are protective and supporting elements made from extrusion-resistant materials. They are installed in a groove together with an elastomeric sealing element preferably with a corresponding O-Ring, in both dynamic and static applications, to prevent extrusion of the O-ring when it is subject to high pressures or elevated temperatures. Elevated temperatures (160° F and higher) impose a severe burden on the physical and mechanical properties of rubber O Rings which further increases their tendency to extrude. Two back-up rings should be used with one on each side of the primary seal. Due to the tight fit of the Back-up Ring in the housing, they prevent extrusion of the pressurised elastomeric sealing element into the sealing gap.

H ID OD Part No h
16 25 60 30 02500 06000 160 6
12.5 35 60 30 03500 06000 125 4
11.13 39.55 63 30 03955 06300 111 3.1
11 45 70 30 04500 07000 110 3.3
20 35 75 30 03500 07500 200 2.5
15.85 26.6 76 30 02660 07600 159 5
8.5 38.5 76 30 03850 07600 085 4
13 43 80 30 04300 08000 130 3.5
11.13 56.38 80 30 05638 8000 111 3.1
20 33.5 95 30 03350 09500 200 6