Item Description
1 Seal face
2 Stationary seat
3 Bellows
3a Gasket
4 Spring
5 Ring
5a Locking ring
5b Collar

BT-AR

Features

  • Rubber bellows mechanical seal
  • Unbalanced
  • Single spring
  • Independent of direction of rotation
  • Short axial installation length

Advantages

Mechanical seal for large-series cold water pumps, produced in millions of units per year. The BT-AR owes its success to the wide range of application, the short axial length (this allows for more economic pump construction and saves material), and the best quality/price ratio. The elasticity of the bellows design enables a more robust operation.

The BT-AR can also be used as a multiple seal in tandem or back-to-back arrangement when the product media cannot ensure lubrication, or when sealing media with a higher solids content. Installation proposals can be provided upon request.

Operating range

Shaft diameter: d1 = 6 … 70 mm (0.24" … 2.76")
Pressure: p1* = 6 bar (87 PSI),
vacuum … 0.5 bar (7.45 PSI) up to 1 bar (14.5 PSI) with seat locking
Temperature:
t* = -20 °C … +120 °C (-4 °F … +248 °F)
Sliding velocity: vg = 10 m/s (33 ft/s)

* Dependent on medium, size and material

Materials

Seal face:
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Carbon graphite, full carbon (B3), Silicon carbide (Q1, Q6), Tungsten carbide (U), PTFE glass fiber reinforced (Y)
Seat:
Steatite (X), Aluminium oxide (V, V1), Silicon carbide (Q1, Q6, Q7), Tungsten carbide (U), Cr steel (E), CrNi steel (F), CrNiMo steel (G)
Elastomers:
NBR (P), EPDM (E), FKM (V), HNBR (X4)
Metal parts:
CrNi steel 1.4301 (F), CrNiMo steel 1.4401 (G), CrNi steel 1.4057 (F1)

Standards and approvals

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



Product variants

BT-AR3
Seal faces with brazed tungsten carbide (U) for abrasive media. Elastomers and diameter range the same as BT-AR. The BT-AR3 is the right choice of seal for use in high duty applications or when abrasives (e.g. waste water) could damage the seal faces.

Item Description
1 Seal face housing
1a Brazed seal face
2 Stationary seat housing
2a Brazed stationary seat
3 Bellows
3a O-Ring
4 Spring
5 Ring
5a Locking ring
5b Collar
True