Elastomer bellows mechanical seal is indentified by the use of an elastomer bellows or diaphragm for the secondary sealing member. Elatomer bellows seal units require a positive abutment at the back of the bellows or spring, positioned so as to give the correct seal working length


Product variants


John Crane Type502 Replacement

Mechanical Seal Type TG502B is one of the best performing bellows seal,it is ideal for use in hot water pumps, industrial pumps and petroleum chemical industry

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Products Details

  With full enclosed  elastomer bellows design

  Insensitive to shaft play and run out

  Bellows should not twist due to bi-directional and robust drive

  Single seal and single spring 

  Conform with DIN24960 standard

Recommended Applications

  Petroleum chemical industry

  Industrial pumps

  Industrial pumps

  Process pumps 

  Other Rotating Equipment

Operating range

Shaft diameter: d1=14...100 mm 
Pressure:  p=0...2.8Mpa(406psi)
Temperature:  t = -40 °C ...200 °C(-40°F to 392°F)
Sliding velocity: Vg≤13m/s(42.6ft/m)

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

Product Structure
Combination Materials

Rotary Face

    Carbon graphite resin impregnated Ak
    Silicon carbide (RBSIC) O

    Hot-Pressing Carbon Ac

Stationary Seat

    Aluminium oxide(Ceramic) B
    Silicon carbide (RBSIC) O

    Tungsten carbide W1

 Auxiliary Seal

   Nitrile-Butadiene-Rubber (NBR) P
    Fluorocarbon-Rubber (Viton) V

   Ethylene-Propylene-Diene (EPDM) E


    Stainless Steel (SUS304) F

 Metal Parts

    Stainless Steel (SUS304) F

Stationary Seat
Standard Stationary Seat:T3BO
T3BO equivalent to John Crane BO

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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.