Cap seals are predominantly used as rod seals, in the case of reciprocating motions, for sealing liquid and gaseous media. They are suitable for operating pressures up to 16 bar. Former predominantly radial oil seals in accordance with German standard DIN 3760 and additional support rings were used for such sealing functions. In comparison with this type of seal, QHW type cap seals provide considerable advantages:
- Only one component thanks to the omission of the support ring
- Easier installation
- More favourable operating behaviour
In principle, installation of these cap seals is the same as that of radial oil seals, however, the angular metallic support element is nearer the rod and the sealing lip is considerably stronger. In order to avoid extreme deformation under the effect of the medium pressure, the sealing lip has been kept shorter.
QHW cap seals are also available with a scraper or protective lip. Many dimensions of QHW cap seals correspond with those of radial oil seals. Therefore, if the principal dimensions are the same, these are interchangeable. Great quantities of cap seals are also used for a rod sealing in shock-absorbers and telescopic struts (figures
33 and 34). Merely their fixture and type of attachment are different from those of normal cap seals.
| Item number | d | D | H | h |
| QHW 6 • 12 NGU 01 | 6 | 12 | 3 | |
| QHW 8 • 14 NGU 01 | 8 | 14 | 3 | |
| QHW 8 • 16 VGF 01 | 8 | 16 | 7 | |
| QHW 8 • 20 VGFU 02 | 8 | 20 | 8 | 1,5 |
| QHW 8 • 20 VGFU 03 | 8 | 20 | 6 | 1,5 |
| QHW 8 • 22 VGFU 01 | 8 | 22 | 8 | |
| QHW 8,5 • 18 NGF 01 | 8,5 | 18 | 7 | |
| QHW 10 • 20 VGF 01 | 10 | 20 | 4,5 | 1 |
| QHW 10 • 22 VGF 01 | 10 | 22 | 7 | |
| QHW 10 • 22 VGFU 01 | 10 | 22 | 6 | 0,5 |
| QHW 10 • 35 VGFU 01 | 10 | 35 | 8 | |
| QHW 10 • 40 VGFU 01 | 10 | 40 | 8 | |
| QHW 12 • 21 VGF 01 | 12 | 21 | 7 | |
| QHW 12 • 22 NGF 01 | 12 | 22 | 7 | |
| QHW 12 • 22 VGF 01 | 12 | 22 | 7 | |
| QHW 12 • 24 RGFU 01 | 12 | 24 | 7 | 1,5 |
| QHW 14 • 22 NGF 01 | 14 | 22 | 7 | |
| QHW 14 • 32 VGFU 01 | 14 | 32 | 10 | |
| QHW 15 • 24 VGF 01 | 15 | 24 | 7 | |
| QHW 15 • 35 VGF 01 | 15 | 35 | 9,5 | 3 |
| QHW 16 – 30 VGFU 01 | 16 | 30 | 6 | |
| QHW 17 • 35 VGF 01 | 17 | 35 | 10 | 2,5 |
| QHW 18 • 32 VGF 01 | 18 | 32 | 7 | |
| QHW 18 • 35 VGFU 01 | 18 | 35 | 8 | |
| QHW 20 • 26 NGU 01 | 20 | 26 | 5 | 1 |
| QHW 20 • 30 VGF 01 | 20 | 30 | 7 | |
| QHW 20 • 35 VGFU 01 | 20 | 35 | 8,5 | 2,2 |
| QHW 20 • 38 VGF 01 | 20 | 38 | 10 | |
| QHW 20 • 40 VGFU 01 | 20 | 40 | 10 | |
| QHW 22 • 37 NGFU 01 | 22 | 37 | 7 | |
| QHW 22 • 65 VGFU 01 | 22 | 65 | 8 | 1,5 |
| QHW 25 • 35 NGFU 01 | 25 | 35 | 6 | 0,5 |
| QHW 25 • 36 VGFU 01 | 25 | 36 | 7,5 | 1,5 |
| QHW 25 • 47 VGF 01 | 25 | 47 | 10 | |
| QHW 26 • 35 VGF 02 | 26 | 35 | 7 | |
| QHW 26 • 36 VGF 01 | 26 | 36 | 7,5 | |
| QHW 27 • 36 VGF 01 | 27 | 36 | 7 | |
| QHW 29 • 38 VGF 01 | 29 | 38 | 7 | |
| QHW 30 • 40 VGF 01 | 30 | 40 | 6 | 1,2 |
| QHW 30 •40 VGF 02 | 30 | 40 | 6 | 1,2 |
| QHW 30 • 47 VGFU 01 | 30 | 47 | 7,5 | 1,5 |
| QHW 30 • 75 VGFU 01 | 30 | 75 | 8 | 1,5 |
| QHW 32 • 42 VGF 01 | 32 | 42 | 6 | 1,2 |
| QHW 32 • 45 VGFU 01 | 32 | 45 | 6,5 | 1,2 |
| QHW 35 • 47 VGFU 01 | 35 | 47 | 7 | 1,5 |
| QHW 36 • 46 VGF 01 | 36 | 46 | 7 | 1,5 |
| QHW 38 • 50 VG FU 01 | 38 | 50 | 7 | 1,5 |
| QHW 40 • 54 VGF 01 | 40 | 54 | 7 |
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