BT-RN Balanced

BT-RN Balanced
Item Description
1 Seal face
2 Stationary seat
3, 3a O-Ring
4 Spring
A Spacer (upon request)

BT-RN.NB has an installation length l1N in accordance with EN 12756 (normal length).
BT-RN.KB has an installation length l1K in accordance with EN 12756 (short length).

BT-RN Balanced


  • Single pusher-type seal
  • Balanced
  • Conical spring
  • Dependent on direction of rotation
  • Short length (KB)
  • Normal length (NB)


The BT-RN.NB/KB represents a traditional pusher seal and is the balanced version of a BT-RN. Designed for high pressure fluids, it is made from the same material range as the BT-RN. The main characteristic is a short design combined with an economical seal solution. Length and dimensions according to EN 12756 (RN.NB normal length, RN.KB short length).

Operating range

Shaft diameter:
d1 = 10 … 100 mm (0.39" … 3.94")
Pressure: p1* = 25 (40) bar (363 (580) PSI)
t* = -35 °C … +180 °C (-31 °F … +292 °F)
Sliding velocity: vg = 15 m/s (49 ft/s)

* Dependent on medium, size and material


Seal face:
CrNi steel 1.4057 (F1), CrNiMo steel 1.4401 (G), Tungsten carbide (U)
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Tungsten carbide (U) Elastomers: NBR (P), EPDM (E), FKM (V), FFKM (V)
Metal parts: CrNiMo steel (G), CrNi steel (F, F1)

Standards and approvals

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


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

Product variants


Seal faces made of brazed tungsten carbide which is suitable for media with medium corrosive and abrasive characteristics.

Item Description
1 Seal face housing
1a Brazed seal face
2 Stationary seat housing
2a Brazed stationary seat
3, 3a O-Ring
4 Spring
A Spacer (upon request)