Gas drying system

Claim 1

A COMPRESSOR UNIT FOR SUPPLYING DRY AIR TO PNEUMATIC SYSTEMS, INCLUDING: A CONTROLABLE AIR COMPRESSOR OPERATIVELY DRIVEN TO COMPRESS AIR TAKEN IN AT AN ATMOSPHERIC PRESSURE AND DELIVERED TO AN OUTLET AT A HIGHER THAN ATMOSPHERIC PRESSURE; A SINGLE DESICCANT TANK CONTAINING A DESICCANT MATERIAL HAVING A RELATIVELY LARGE SURFACE AREA CONNECTED TO SAID OUTLET TO RECEIVE SAID COMPRESSOR AIR; SAID DESICCANT TANK HAVING AN OUTLET CONNECTED THROUGH A CHECK VALVE TO AN AIR STORAGE TANK FOR SAID PNEUMATIC SYSTEM; SAID DESICCANT TANK OUTLET FURTHER CONNECTED TO A PRESSURE OPERATED DUMP VALVE WHICH IS IN TURN CONNECTED TO THE ATMOSPHERE; SAID COMPRESSOR AIR BEING DRIED BY SAID DESICCANT MATERIAL AS SAID AIR PASSES INTO SAID AIR STORAGE TANK THROUGH SAID CHECK VALVE WHEN SAID DUMP VALVE IS CLOSED; CONROL MEANS RESPONSIVE TO THE AIR PRESSURE IN SAID AIR STORAGE TANK AND CONNECTED TO SAID PRESSURE OPERATED DUMP VALVE TO CONTROL SAID DUMP VALVE; SAID DESICCANT MATERIAL BEING DRIED BY SAID COMPRESSOR AIR WHEN SAID CONTROL MEANS OPENS SAID DUMP VALVE TO THE ATMOSPHERE THEREBY SUPPLYING A LOW PRESSURE OUTLET FOR SAID COMPRESSOR AIR AS IT PASSES THROUGH SAID DESICCANT MATERIAL; AND PRESSURE OPERATED TIME DELAY MEANS CONNECTED TO SAID DESICCANT TANK OUTLET; SAID TIME DELAY MEANS FURTHER BEING CONNECTED TO SAID AIR COMPRESSOR TO OPERATIVELY CONTROL SAID COMPRESSOR IN RESPONSE TO THE PRESSURE IN SAID DESICCANT TANK OUTLET; SAID TIME DELAY MEANS STOPPING SAID COMPRESSOR WHEN SAID PRESSURE IN SAID DESICCANT TANK OUTLET HAS BEEN AT SUBSTANTIALLY ATMOSPHERIC PRESSURE FOR A FIXED TIME.