Item Description
1 Seal face
2 Seat
3 Bellows
3a Gasket
4 Spring
5 Collar
5a L-ring



  • Rubber bellows mechanical seal
  • Unbalanced
  • Single spring
  • Independent of direction of rotation
  • Stationary design


Stationary mechanical seal in inch dimensions. Spread throughout the world, this type of mechanical seal has reached an unsurpassed quality level. The BT-A2 features all carbon or high quality resin impregnated carbon, aluminium oxide 96 %, is stationary and the rubber bellows are glued on collar. Static air pressure test to 100 % production. Excellent solution for swimming pool pumps.

Operating range

Shaft diameter: d1 = 1/2", 5/8", 3/4"
Pressure: p1* = 4 bar (58 PSI)
t* = -20 °C … +90 °C (-4 °F … +194 °F)
Sliding velocity: vg = 10 m/s (33 ft/s)

* Dependent on medium, size and materials


Seal face: Carbon graphite resin impregnated (B), Carbon graphite, full carbon (B3)
Seat: Aluminium oxide (V1),
Silicon carbide (Q1)
Elastomers: NBR (P), EPDM (E), FKM (V)
Metal parts: CrNi steel (F), CrNiMo steel (G)