Burgmann wave spring mechanical seal H7N for water pump

Temperature -20℃ to +180℃
Pressure ≤2.5Mpa
Speed ≤15m/s
Material Q2,B,U2,P,E,V,F,G

Type:Wave/Multi Spring Mechanical Seal

Replacement:Bergmann H7N/H75,AES W07DMB

Temperature:-20℃ to +180℃

Pressure:≤2.5Mpa

Speed:≤15m/s

Material:Q2,B,U2,P,E,V,F,G

Features

• For stepped shafts

• Single seal

• Balanced

• Super-Sinus-spring or multiple springs rotating

• Independent of direction of rotation

• Integrated pumping device available (H7F, H75F)

• Variant with seat cooling available (H75G115)

Advantages

• Universal application opportunities (standardization)

• Efficient stock keeping due to easily interchangeable 

faces

• Extended selection of materials

• Flexibility in torque transmissions

• Self cleaning effect

• Short Installation length possible (G16)

Operating range (see note on page 1)

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

(Single spring: d1 = max. 100 mm (3.94"))

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…22 mm: ±1.0 mm

d1 24…58 mm: ±1.5 mm

d1 from 60 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

Recommended applications

• Process industry

• Oil and gas industry

• Refining technology

• Petrochemical industry

• Chemical industry

• Power plant technology

• Pulp and paper industry

• Food and beverage industry

• Hot water applications

• Light hydrocarbons

• Boiler feed pumps

• Process pumps

Item Part no. to DIN 24250 Description

1.1 472 Seal face

1.2 485 Drive collar

1.3 474 Thrust ring

1.4 412.1 O-Ring

1.5 477 Spring

1.6 904 Set screw

2 475 Seat (G9)

3 412.2 O-Ring


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