Type：Double Mechanical Seal
Replacement：Burgmann H74D
Temperature：-20℃ to +180℃
Pressure：≤1.2Mpa
Speed：≤15m/s
Material：V1,Q1,Q2,U2,B,A,P,E,V,M1,M2,F,G,M
Features
• For stepped shafts
• Dual seal
• Balanced
• Rotating multiple springs
• Independent of direction of rotation
• Seal concept based on the H7 range
• Variant with pumping screw available (H74F-D)
Advantages
• Efficient stock keeping due to easily interchangeable
faces
• Extended selection of materials
• Flexibility in torque transmissions
• Insensitive to low solids contents
• EN 12756
(For connection dimensions d1 up to 100 mm (3.94"))
Operating range
Shaft diameter: d1 = 14 … 200 mm (0.55" … 7.87")
Pressure:
p1 = 80 bar (1.160 PSI) for d1 = 14 … 100 mm,
p1 = 25 bar (363 PSI) for d1 = 100 … 200 mm,
p1 = 16 bar (232 PSI) for d1 >200 mm
Temperature: t = –50 °C … +220 °C
(–58 °F … +428 °F)
Sliding velocity: vg = 20 m/s (66 ft/s)
Axial movement:
d1 up to 100 mm: ±0.5 mm
d1 from 100 mm: ±2.0 mm
Materials
Seal face: Silicon carbide (Q1, Q2), Carbon graphite
antimony impregnated (A), Aluminium oxide (V),
Special cast CrMo steel (S)
Seat G9: Carbon graphite antimony impregnated (A),
Carbon graphite resin impregnated (B), Silicon carbide
(Q1*, Q2*)
Secondary seals: EPDM (E), NBR (P), FKM (V), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G), Duplex (G1)
* Cannot be combined with seal face in S
Standards and approvals
• EN 12756
Materials
Seal face: Silicon carbide (Q1), Aluminium oxide (V)
Seat: Carbon graphite resin impregnated (B), Carbon
graphite antimony impregnated (A), Silicon carbide (Q1)
Elastomers: NBR (P), EPDM (E), FKM (V), FFKM (K)
Metal parts: CrNiMo steel 1.4401 (G)
Recommended applications
• Chemical industry
• Pharmaceutical industry
• Building services industry
• Centrifugal pumps
• Clean water pumps
Certificates
• KTW / UBA
• W270
• ACS
• WRAS
• NSF
• DM 174/04
• FDA
Item Description
1 Seal face
2 Stationary seat
3, 3a, 3b O-Ring
4 Spring
5 Collar
6 Driver
6a Set screw
