Patent ID: 8894752
Filing Date: 2014-11-25
Classification: B01D,B60T,Y10S

Abstract:
1. An air dryer, comprising: a. a first flow path through the air dryer, wherein the first flow path comprises a first check valve that prevents fluid flow into the first flow path and a first exhaust valve having an open position that permits fluid flow out of the first flow path and a shut position that prevents fluid flow out of the first flow path; b. a second flow path in parallel with the first flow path, wherein the second flow path comprises a second check valve that prevents fluid flow into the second flow path and a second exhaust valve having an open position that permits fluid flow out of the second flow path and a shut position that prevents fluid flow out of the second flow path; c. a first control air valve that provides fluid communication from upstream of the second check valve to the first exhaust valve; and d. a second control air valve that provides fluid communication from upstream of the first check valve to the second exhaust valve.