Double shut-off valves

Where 100% leaktightness, even to TRD, is demanded then double shut-off butterflies are deployed. Two butterflies or one butterfly with double sealing form an air seal chamber in the closed state into which a barrier medium, e.g. air, is blown. Our technicians calculate the required barrier air volume and pressure such that a 100% leak-tightness is guaranteed for all operational states. With options such as differential pressure measurement for monitoring the leak-tightness, barrier air heating to prevent falling below the dewpoint and a swing-type non-return valve in the barrier air line to protect the blower from the medium, we supply complete and fully functional units.