Rubber expansion joints

ERV-Rubber and PTFE expansion joints are available in a variety of rubber qualities with and without certification. They are often used in diesel or gas engines, chemical plant, the food industry or in heating and sanitary areas as well as waste water treatment plant.

HKS-Angular-Gummi-Kompensator-Vakuumstützring
HKS-Angulargummikompensator mit Vakuumstützring

Rubber expansion joint parameters

Bellows materials/rubber qualities

  • NBR (Nitrile, Nitrile Butadiene Rubber)
  • EPDM
  • CR (Chloroprene)
  • CSM (Hypalon, ChloroSulfonated Polyethylene)
  • PTFE
  • Butyl II-R / EPDM Compound
  • FPM (Viton)

Connection parts

  • Flanges of C steel (S235JR)
  • high-alloyed steel (1.4541, 1.4571, 1.4571, 1.4828, etc.) or special steels
  • Screw fittings of malleable iron or high-alloyed steel

Nominal widths

  • DN20 to DN3200

Operating temperature

  • up to 130 °C

Pressure levels

  • PN1 to PN25

Movement absorption

  • axial
  • lateral
  • angular
  • Combinations thereof

Available accessories

  • Vacuum support rings (VSD)
  • Tensions like tie rod - length limiter
  • Joints (simple or universal joint)
  • Flame-resistant covers
  • Protective covers (Ground protection covers)
  • Guide tubes

ERV-Expansion joint types

  • Type 1: R, RS, CR, G, GS, GR, W
  • Type 2: Red, yellow, green, black
  • Type 3: HZR, HZRS, HZRB, HZG, HZW

ERV-Rubber expansion joint types

The HKS Type 1 rubber expansion joints in construction types R, RS, CR, G, GS, GR and W can be supplied in nominal widths from DN25 to a maximum of DN1000. Various certifications are available for these rubber expansion joint types, such as DVGW, TÜV, BWB, ABS, USCG, BV, LR, GL, USSR Register of Shipping, DNV and RINA.

The HKS Type 2 rubber expansion joints in construction types red, yellow, green and black can be supplied in nominal widths from DN450 to DN3200. These rubber expansion joints are individually designed and supplied without certification to meet customer requirements regarding the pressure level.

The HKS Type 3 rubber expansion joints in construction types HZR, HZRS, HZB, HZG und HZW are manufactured with malleable iron or stainless steel screw fittings on both sides and can be supplied in nominal widths from DN20 to DN50. Some certifications from ACS and to meet DIN4809 are available for these rubber expansion joints.

Further rubber expansion joint types and variants are available on request