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
12 7 26.5 30 00700 02650 120 4
8 11 32 30 01100 03200 080 2.5
11 26 32 30 02600 03200 110 6
10 15 35 30 01500 03500 100 3
12 13 36 30 01300 03600 120 3.5
12 11 38 30 01100 03800 120 3
7.2 22 38 30 02200 03800 072 3
10 22.7 38 30 02270 03800 100 3.2
9.52 19.96 40 30 01996 04000 095 2.8
13 19 42 30 01900 04200 130 3.5