| 摘要 |
An air dryer having a turbosaver valve which prevents the supercharged air from the engine from being discharged through the air dryer. The air dryer comprises a stepped control port bore adapted to slidably receive the turbosaver valve for selectively sealing the control port bore and the air intake bore. The turbosaver valve is intermediate the drying chamber and the purge valve so that the turbosaver valve 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 drying chamber and the purge valve insures that the compressed air must pass through the coalescing filter in the loading mode while permitting the purge air to by-pass the coalescing filter in the unloading mode. In the loading mode, the compressed intake air forces the turbosaver valve to directly seal the control port bore in order to prevent the compressed air from the intake port from passing downstream of the coalescing filter and contaminating the desiccant filter. In the unloading mode, the turbosaver valve directly seals the air intake port in response to a control signal, allowing the purge valve to be opened without purging the supercharged air from the engine to the atmosphere during the unloading cycle. The turbosaver valve permits the purged air to bypass the coalescing filter which minimizes the back pressure in the desiccant filter to decrease the purge time of the dryer and to increase the efficiency of the air dryer.
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