ASSURING AND CHECKING LEAK-FREE PROPERTIES Applications - the fluids in question Special vigilance is required against the risks posed to man and the environment by certain products. In addition to operational checks to ensure that isolation components are working correctly, doubly secure seals as well as measures in the event of a leak should also be provided for (emissions). Dangerous acids Toxic gasses Pollutants Possible solutions Double sealing Using a solution that incorporates genuine double sealing by: • Fitting an extra packing gland (TA-LUFT approved design) at the top of the valve extension. • Special seal types (valve - extension) suited to each use (o-ring, square seal, etc.). • Possible use of a gauge on the lower part of the extension for detecting leaks, thereby ensuring that the system is intact and allowing a controlled servicing operation.