Seal Replacement Burgmann M7N/M78N AES W07DM Vulcan 1677 Flowserve Europac 600

Temperature: -30℃ to +210℃
Pressure: ≤1.2Mpa
Speed: ≤18m/s
Material: Q2,B,U2,P,E,V,F,G

Features

• For plain shafts

• Single seal

• Unbalanced

• Super-Sinus-spring or multiple springs rotating

• Independent of direction of rotation

• Pumping screw for media with higher viscosity (M7..F)

• Variant with PTFE secondary seals for high chemical 

resistance (M78N)


Advantages

• Universal application opportunities

• Efficient stock keeping 

• due to easily interchangeable faces

• Extended selection of materials

• Insensitive to low solids contents

• Flexibility in torque transmissions

• Self cleaning effect

• Short installation length possible (G16) 

Operating range 

Shaft diameter: d1 = 14 … 100 mm (0.55" … 3.94")

Pressure: p1 = 25 bar (363 PSI)

Temperature: t = –50 °C … +220 °C 

(–58 °F … +428 °F)

Sliding velocity: vg = 20 m/s (66 ft/s)

Axial movement:

d1 =…25 mm: ±1 mm

d1 = 28…63 mm: ±1.5 mm

d1 = from 65 mm: ±2 mm


Materials

Seal face: Special cast CrMo steel (S), Silicon carbide 

(Q1, Q2), Aluminium Oxide (V)

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)

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


Recommended applications

• Process industry

• Chemical industry

• Pulp and paper industry

• Water and waste water technology

• Shipbuilding

• Food and beverage industry

• Lube oils

• Low solids content media

• Water / sewage water pumps

• Chemical standard pumps

• Vertical screw pumps

• Gear wheel feed pumps

• Multistage pumps (drive side)

• Circulation of printing colors with viscosity 

• 500…15,000 mm2/s


Product variants 

M74

Dimensions, items and descriptions

as for M7N, but with multiple springs

(Item no. 1.5). Preferably for d1 >100 mm (3.94").

M7F

Shaft diameter: d1 = max. 100 mm (3.94")

Dimensions, items and descriptions

as for type M7N, but with pumping screw. Dependent on direction of rotation! (Viscosity ≤ ISO VG10).

M74F

Shaft diameter: d1 = 14 … 200 mm (0.55" … 7.87")

Dimensions, items and descriptions

as for type M7N, but with multiple springs and pumping screw. Dependent on direction of rotation!

(Viscosity ≤ ISO VG10).

M7S2

Shaft diameter: d1 = max. 100 mm (3.94")

Dimensions, items and descriptions as for type M7N, but with drive key. (without item no. 1.6).

M74S2

Shaft diameter: d1 = 28 … 200 mm (1.10" … 7.87")

Dimensions, items and descriptions

as for type M7N, but with multiple springs and drive key. (without item no. 1.6).

M78N

Shaft diameter: d1 = 18 … 100 mm (0.71" … 3.94") Temperature: t = max. 180 °C (356 °F)

Dimensions, items and description as for M7N. Design of the seal face especially for secondary sealing element made of PTFE (T).

Seal face: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B),

Silicon carbide (Q1)*

Seat G9: Special cast CrMo steel (S)*, Silicon carbide (Q1)

*Cannot be combined with seal face made of silicon carbide (Q1)


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