The Type HXM7N is equal to Burgmann M7N mechanical seals which designed for universal application and ideal suited for standardisation.The loosely inserted seal faces are easily exchanged,permitting all combinations of materials and stock rationalisation .With Super-Sinus spring.Extremely rugged and reliable,they cover a wide spectrum of applications-in water pumps,sewage pumps,submerged pumps,chemical pumps,etc.
Features
●For plain shafts
●Single seal
●Unbalanced
●Super-Sinus-spring or multiple springs rotating
●Independent of direction of rotation
●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)
●Pumping screw for media with higher viscosity (M7..F)
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 = up to 25 mm: ±1.0 mm
d1 = 28 up to 63 mm: ±1.5 mm
d1 = from 65 mm: ±2.0 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 made of S
Standards and approvals
●EN 12756
Recommended applications
●Process industry
●Chemical industry
●Pulp and paper industry
●Water and waste water technology
●Shipbuilding
●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.

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