L2M - FPM (Viton)

Construction (drawing)

 1. Steel outer ring in Fe-P03 with a finish surface according to the relevant DIN standard for outer diameters.

2. Steel filler ring in Fe37 steel providing the rigidity required to ensure an accurate assembly of the seal in the groove.

3. Stainless steel spring carrier to BS1 301 S 01 is designed:

a) to ensure the spring retention during the assembly;

b) if necessary to permit the removal and refitting of garter spring in AISI 316 to provide a predetermined sealing lip preload which will permit the sealing element to follow shaft deflections.

4. Garter spring in AISI 316 to provide a regulated loading on the sealing lip and enable the sealing element to follow shaft deflections.

5. Sealing element is available in the elastomers listed below and is bonded to the steel outer ring.

Operating conditions

Pressure:     ≤0,5 bar

Temperature: -20°C...+220°C

Surface speed: ≤30m/s

 Shaft tolerances:                                                         

≤100 mm                           ± 0,08

 101 - 150mm                   ± 0,10   

151 - 250mm                   ± 0,13

 > 250mm                          ± 0,25

Housing tolerances:

   ≤76 mm                           ± 0,025

  77 - 150 mm                    ± 0,040

151 - 255 mm                   ± 0,050

256 -510 mm                   +0,05/-0,10

511 -1015 mm                  +0,05/-0,15

> 1015 mm                      +0,05/-0,25

Shortening of the spring when the seal is rotating:

- Shaft surface speed < 5 m/s:              Standard spring

- Shaft surface speed 5 - 10 m/s:          Spring must be shortened 5 - 10%

- Shaft surface speed > 10 m/s:            Spring must be the static part

Finishing of the shaft surface:

- Surface roughness: Ra 0,2 - 0,4 μm

- Load bearing surface > 60 % plunge grinded

- Hardness: 58 - 62 HRC hardened or metal coated (e.g. chrome carbide)

- Ceramic coatings (e.g. chromium oxide, surface speed < 10 m/s)