STK 191 elastic bellows seals, available in 32/55 sizes, fit common Wilo centrifugal pumps (often used 

in heating applications). Brass shaft sleeves for installation are also stocked. Features: High flexibility 

of rubber bellows compensates axial movement, radial runout and vibration, reducing leakage risk from 

seal face displacement; Suitable for low-to-medium load scenarios like clean water, sewage, chemical 

and centrifugal pumps; Rotating ring connects directly to rubber bellows via interference fit, minimizing secondary seals and leakage points.

  Face Material:Stationary Face: Tungsten Carbide;             Pressure:-0.1 MPa to 1.6 MPa

  Rotating Face: Carbon Graphite.

                                                                                               Speed:≤25m/s

  Bellows Material:High-flexibility elastomer (comp-

  ensates for axial/radiall runout and vibration).                     Temperature:-20°C to 150°C

  O-Ring Material:High-chemical-resistance elasto-

  mer (selected based on media compatibility).