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Laufer Valve

Leakage control of the moving O-ring seal of Arc Valves

For maxiumum product safety of sensitive media

For maxiumum product safety LIAG® free flow shutter valves are available with a leakage monitoring System of the only dynamic O-ring. This specific design identifies possibile wearing defects of the seal and prevents any contamination from the outside Environment.


  • Maxiumum product safety for aseptic processes
  • No contamination from the outside Environment by as a result of excessive wearing or a defective stem O-ring seal
  • Quick acting valve due to low operating torque requirements (ball-bearing supported main shaft)
  • Able to be retrofit to shutter valves


The special designed leakage chamber can act as a steam barrier or offer monitoring via means of a level conductor control (dilution of glycerine).

The pivoting axle is supported with a ball-bearing shaft for increased stability and less required operating torque compared with the standard shutter valve.


Data Sheets

Leakage control moving O-ring seal

Technical Data Overview

Nominal sizes:
Inox parts in contact with product:AISI 316L (1.4404)
Other inox parts: AISI 304 (1.4301)
O-ring seals:EPDM, FPM (Viton®)‚ FEP, other grades upon request
In contact with product:Ra ≤ 0.8µm (Ra ≤ 32µin)
Operating temperature:110°C (230°F)
Short-term:140°C (284°F) - optionally up to 200°C (392°F)
Operating pressure:
Pressure behind arc:10 bar (145 psi) - optionally up to 20 bar (290.1 psi)
Pressure against arc:3 bar (43.5 psi) 

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