Assignee:
Midland Brake, Inc. - Kansas City MO
International Classification:
B01D 5000
Abstract:
An air dryer is provided which permits the purge air to bypass the coalescing filter during the unloading cycle in order to minimize the back pressure in the desiccant filter, decrease the purge time of the dryer, and increase the efficiency of the air dryer. In one embodiment, the air dryer may have a passage disposed between the coalescing filter and the desiccant filter so as to permit purge air to bypass the coalescing filter during the unloading cycle. A turbosaver valve may also be disposed so that it controls not only the flow of air through the coalescing filter but also the discharge of the purge air and the contaminants. Disposing the turbosaver valve intermediate the upstream and downstream sides of the coalescing filter insures that the turbosaver valve passes the compressed air through the coalescing filter in the loading mode while permitting the purge air to by-pass the coalescing filter in the unloading mode. In another aspect of the invention, the air dryer is provided which has a tamper resistant connecting member for sealably connecting the upper and lower housings so that the dryer cannot be improvidently disassembled.