Metal Bellows seal are constructed by welding a series of diaphragms together to form a bellows units. Metal bellows seals are often effective in a wide range of other seal applications. The most common of these is chemical, general water pump applications.


Product variants


EagleBurgmann Type MFL85N series replacement

Welded metal bellows mechanical seals Type TG685 is a high parameter seal, used in corrosive media and large friction coefficient media. With good floatability and random compensatory, widely used in petrochemical industry, sewage treatment industry and paper industry.

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Products Details
  Welded metal bellows construction,Balanced, Independent of direction of rotation
  Bellows not only used as elastic component, but also has good torque transmission effect
  No dynamically loaded O-Ring
  Dimensional data conform with DIN24960 standard
Recommended Applications
  Refining technology, Oil and gas industry
  Process industry
  Special Rotating Equipment.
Operating range

Shaft diameter:  d1=18...100mm(0.750'' ...4.000'')
Pressure:  p=0...2.5Mpa(362.5psi)
Temperature:  t = -20 °C ...220 °C(-4°F to 428°F)
Sliding velocity: Vg≤15m/s(49.2ft/m)


Notes: The range of preesure,temperature and sliding velocity is depend on seals combination materials

Product Structure
Combination Materials

 Rotary Face 
    Silicon carbide (RBSIC) O
    Carbon graphite resin impregnated Ak
    Tungsten carbide W1
 Stationary Seat 
    Silicon carbide (RBSIC) O
    Tungsten carbide W1
    Fluorocarbon-Rubber (Viton)  V
    Ethylene-Propylene-Diene (EPDM) E
    PTFE Enwrap Viton M1

    Alloy C-276 M4
    Stainless Steel (SUS316) G
    AM350 Stainless Steel T6
    Alloy 20 M3
    Stainless Steel (SUS304) F
    Stainless Steel (SUS316) G
    4J42 T4

Stationary Seat

Standard Seat:T4G9

T4G9 equivalent to Burgmann G9 

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WenZhou TianGu Seal Co., Ltd was founded in 1982, is located in Wenzhou City, Zhejiang Province Economic and Technological Development Zone, China Hydraulics Pneumatics & Seals Industry Association, in the mechanical seal product design, manufacturing and sales of businesses.