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

BT-FH

Features

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

Advantages

The BT-FH is a seal for demanding applications where operating conditions in the pump require machined metal parts for the mechanical seal. The seals are available in a full range of diameters from 10 to 100 mm and in the standard diameters specifically for chemical applications.

Operating range

Shaft diameter:
d1 = 10 … 100 mm (0.39" … 3.94")
Pressure: p1*= 12 (16) bar (174 (232) PSI)
Temperature:
t* = -35 °C … +200 °C (-31 °F … +392 °F)
Sliding velocity: vg = 15 m/s (49 ft/s)

* Dependent on medium, size and material

Materials

Seal face:
Aluminium oxide (V), Silicon carbide (Q1), Tungsten carbide (U1)
Seat:
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1), Tungsten carbide (U1)
Elastomers:
NBR (P), EPDM (E), FKM (V), FFKM (K)
Metal parts: 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-FH6

Like BT-FH but with PTFE secondary seal elements instead of elastomers. Mainly used in the chemical industry and for corrosive media.
BT-FH.NU / KU

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

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

Like BT-FH but with shorter installation length (see l3C in the dimension table). The model BT-FHC has the same installation length as the BT-RN.
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