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Laufer Valve

Leakage control of the moving O-ring seal of Shutter 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 of the moving O-ring seal

Further information please refer to the datasheet in PDF format.

Technical Data Overview

Nominal sizes:
In contact with product:Ra ≤ 32µin (Ra ≤ 0.8)
Inox parts in contact with product:AISI 316L (1.4404 / 1.4435)
Other inox parts: AISI 304 (1.4301)
O-ring seals:EPDM, FKM (Viton®)‚ FEP, other grades upon request
Operating temperature:230°F (110°C)
Short-term:284°F (140°C) - optionally up to 392°F (200°C)

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