AIRTROL

AIR ELIMINATING DEVICE FOR FACILITATING SEPARATION OF AIR FROM WATER IN CLOSED HOT WATER HEATING SYSTEMS, AND THE COLLECTION OF THE SEPARATED AIR IN AN EXPANSION TANK IN WHICH THE CONNECTION BETWEEN THE TANK AND THE SYSTEM INCLUDES A PORTION WHICH COMMUNICATES WITH THE WATER SPACE OF THE TANK AND IS ARRANGED TO PREVENT TWO-WAY CIRCULATION THERETHROUGH