The APS? construction indicates that the sealing element is pressed pneumatically to the perimeter of the disk in flap position “closed”! Steady pressure tightness is still guaranteed with slight wears by the constant contact pressure of the sealing element of the flap valve. Therefore it shows a special suitability for abrasive bulk material. The shut-off Valve can be employed depending on the used sealing material in a temperature range of – 40°C up to + 200°C. For the triggering of the pneumatic seal Warex offers different solutions in which the seal can, if necessary, escape freely with vacuum support or be charged with nitrogen.
