Item Description
1 Seal face
2 Stationary seat
3, 3a, 3b O-Ring
4 Spring
5 Collar

BT-FN

Features

  • Single pusher-type seal
  • Unbalanced
  • Conical spring
  • Dependent on direction of rotation

Advantages

The BT-FN combines a spring loaded ceramic seal face and the traditional pusher mechanical seals. The competitive price and the wide range of applications have made the BT-FN seal a success. The seal is produced with punched metal parts that allow an economical design.

BT-FN mechanical seals are also the ideal solution for light chemicals media applications. To ensure the best reliable performance, we recommend a material combination of hard material sliding faces and proper elastomer O-Rings.

Operating range

Shaft diameter:
d1*= 10 … 40 mm (0.39" … 1.57")
Pressure: p1*= 12 (16) bar (174 (232) PSI)
Temperature:
t* = -35 °C… +180 °C (-31 °F … +356 °F)
Sliding velocity: vg = 15 m/s (49 ft/s)

* Dependent on medium, size and material

Materials

Seal face:
Steatite (X), Aluminium oxide (V), Silicon carbide (Q1, Q6), Tungsten carbide (U1)
Seat:
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1, Q6), Tungsten carbide (U1)
Elastomers:
NBR (P), EPDM (E), FKM (V), FFKM (K)
Metal parts: CrNi steel 1.4301 (F), CrNiMo steel 1.4401 (G)

Standards and approvals

  • KTW
  • W270
  • ACS
  • WRAS
  • NSF
  • FDA
  • DM 174/04

Notes

Seat ring of alternative seats can be supplied with short tail or with pin to block the seat and prevent seat rotation.



Product variants

BT-FN.NU / KU

BT-FN.NU has an installation length l1N and dimensions in accordance with EN 12756 (normal length, unbalanced).
BT-FN.KU has an installation length l1K and dimensions in accordance with EN 12756 (short length, unbalanced).

Item Description
1 Seal face
2 Stationary seat
3, 3a, 3b O-Ring
4 Spring
5 Collar
A Spacer (upon request)
True