Burgmann M74-D Double Mechanical Seal

 Features

• For plain shafts

• Dual seal

• Unbalanced

• Rotating multiple springs

• Independent of direction of rotation

• Seal concept based on the M7 range

• Variant with pumping screw available (M74F - D)

 Advantages

• Efficient stock keeping due to easily interchangeable faces

• Extended selection of materials

• Flexibility in torque transmissions

• EN 12756 (for connection dimensions d1 up to 100 mm (3.94"))

 Operating range (see note on page 1)

Shaft diameter: d₁ = 18 … 200 mm (0.71" … 7.87") Pressure: p₁ = 25 bar (363 PSI)

Temperature: t = –50 °C … +220 °C (–58 °F … +428 °F)

Sliding velocity: v_g = 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: Special cast CrMo steel (S), Silicon carbide (Q1, Q2)

Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B),

Silicon carbide (Q1*, Q2*)

Seat G4: Silicon carbide (Q1*, Q2*) Seat G6: Silicon carbide (Q1*, Q2*)

Seat G13: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B)

* Cannot be combined with seal face in S

 Standards and approvals

• EN 12756

 Recommended applications

• Process industry

• Chemical industry

• Pulp and paper industry

• Low solids content and low abrasive media

• Toxic and hazardous media

• Media with poor lubrication properties

• Adhesives

• 

Chemical standard pumps