GWG Overfill Prevention Device and Service

Overfill Prevention Valves and Limit Switch

For safety during tank filling


The filling safety device prevents overfilling of storage tanks and bunker tanks when they are filled by tank trucks with petrol, diesel and heating oils. It comprises an overfill prevention sensor inside the tank and a repeater with an actuator inside the tank truck.

The QSS-/ASS connection valve is part of a security system. Here the hose connection to the tanker is checked and the mixing of products caused by incorrect connection during the tank filling is prevented.

Proven millions of times

  • measuring principle functions reliably under the most difficult conditions

Completely maintenance-free

  • robust design without moving parts

Internationally certified

  • In Belgium, Germany, Austria, Poland, Czech Republic and Sweden


  • Approved in accordance with ATEX, TRbF 511 and TRbF 512
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