EAGLEBURGMANN
4
BT-AR
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.
Features
• Rubber bellows mechanical seal
• Unbalanced
• Single spring
• Independent of direction of rotation
• Short axial installation length
Operating range
(see note on page 28)
Shaft diameter: d
1
= 6 … 70 mm (0.24" … 2.76")
Pressure: p
1
* = 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: v
g
= 10 m/s (33 ft/s)
* Dependent on medium, size and material
Materials
(see fold-out page 28)
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)
Item Description
1
Seal face
2
Stationary seat
3
Bellows
3a
Gasket
4
Spring
5
Ring
5a
Locking ring
5b
Collar
Recommended applications
• Water and waste water technology
• Pool and spa applications
• Household appliances
• Domestic and garden pumps
• Whirlpool and swimming pool pumps
• Dishwasher pumps
• Submersible motors / pumps
• Water pumps / waste water pumps
Certificates
• KTW
• W270
• ACS
• WRAS
• NSF
• DM 174/04
• FDA
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.
Product variants
d
4 min
d
3
d
6
±0,1
d
1
±0,05
d
7
–0,1
l
5
l
6
l
4
l
3
5
5a
5b
3
1
2
2a
1a
3a
4
20°
d
4 min
d
3
d
6
±0,1
d
1
±0,05
d
7
–0,1
l
5
l
6
l
4
l
3
5
5a
5b
3
1
2
3a
4
20°
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