Patent ID: 7578872

Claim:
A device for cleansing hydrocarbon vapors comprising: a canister containing carbon therein, having a bottom and an opposite top, an inlet in said top and an outlet; said bottom receiving hydrocarbon vapors from a hydrocarbon source and releasing air into the hydrocarbon source; said inlet having a first branch control drawing air into said canister when the hydrocarbon source is at low pressure and, a second branch control releasing air from said canister when the hydrocarbon source is at high pressure wherein air flows through either said first branch control or said second branch control; said first branch control having a vacuum regulator in communication with a valve and with an intake screen, said vacuum regulator opening to admit air into said canister when a low pressure within the hydrocarbon source is detected; and, said second branch control having a pressure regulator in communication with a valve and with an outlet, said pressure regulator opening to release air cleansed of hydrocarbon vapors when a high pressure within the hydrocarbon source is detected: whereby the inflow of air into said canister purges the carbon of hydrocarbons and the outflow of air from said canister draws vapors from the hydrocarbon source through said canister for adsorption by the carbon; whereby the repetitive inflow and outflow of air through said canister regenerates the carbon.