High speed backstop

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Nonreturn devices for high speeds
VULKAN nonreturn devices are some of the best and most cost-effective products of their kind and can carry out several functions fully automatically, without working with mechanical or hydraulic auxiliaries. The blocking system reacts immediately and precisely.
VULKAN nonreturn devices are safety mechanisms, which prevent machine movement in certain directions of rotation (Counter Recoil) and the machine runs freely in the opposite direction (freewheeling). Typical applications include conveyor belts, elevators, cranes, speed reducers and pumps and are available with or without radial bearings and torque arm.

Technical Data

  • Torque Range TKN [kNm]
    0.10 kNm - 42.50 kNm
  • Speed range [1/min]
    210.00 RPM - 20,000.00 RPM


  • High speed shafts and low speed shafts of machinery driven by electric motors and requiring freewheeling, indexing or backstop functions.


  • High material stiffness, low material density
  • Excellent fatigue strength
  • Intrinsic low unbalance

Tailor-made Solutions

  • Adaptable bending and torsional stiffness of the shaft
  • System solution integration: composite shafting with integrated torsional flexible couplings
  • Reliable electrical isolation of the drive train


  • Complete engineering and project development
  • Combination with flexible couplings is available
  • In-house testing 1:1 up to 5.000 kNm nominal torque