Abstract: Air dryer for a compressed air system includes a desiccant canister and a tubular oil filter received within a cavity within the canister circumscribed by a desiccant bed. A tubular oil filter is mounted on a removable module so that the module and the oil filter may be removed from the air dryer without disturbing the desiccant canister. Accordingly, the oil filter is replaced at more frequent intervals than is the desiccant. During purging, purge air is bypassed around the oil filter directly to the exhaust port through a check valve permitting communication through a bypass passage only during purging.

Abstract: A quick release valve for a vehicle fluid pressure braking system includes a housing having inlet, exhaust and delivery ports. A bead circumscribes the inlet port to provide a valve seating area for a flexible diaphragm within the valve housing, and the exhaust port includes a projecting portion which preloads the flexible diaphragm into engagement with the bead circumscribing the inlet port. Accordingly, pressure variations between the ports cannot force the flexible diaphragm to vibrate to create an undesirable honking noise. Furthermore, the circumferentially extending bead assures a pressure-tight seal with the flexible diaphragm, and also establishes a predetermined sealing area for the diaphragm, thereby reducing valve hysteresis by preventing sealing of the diaphragm at varying areas on the housing.