Abstract: The present invention relates to an air dryer (10) for a vehicle air system. The air dryer (10) includes a body (12) and a desiccant canister (14), the body (12) having an inlet (16) to receive air from an air source, an outlet (18) to supply air to a vehicle air system, a purge outlet and a regeneration inlet (24) to receive regenerative airflow from the vehicle air system. The body (12) is further provided with a chamber (28) containing a coalescer (38)positioned between the inlet (16) and the desiccant canister (14), and a bypass valve (34) positioned between the chamber (28) and the purge outlet. The coalescer (38) and bypass valve (34) are arranged such that during normal operation air entering through the inlet (16) passes through the coalescer (38) before reaching the desiccant canister (14) and during regeneration of the desiccant a portion of the regeneration flow passes through the coalescer (38) and the remainder of the regeneration flow bypasses the coalescer (38) through the bypass valve (34).

Abstract: The present invention relates to an air dryer (10) for a vehicle air system. The air dryer (10) includes a body (12) and a desiccant canister (14), the body (12) having an inlet (16) to receive air from an air source, an outlet (18) to supply air to a vehicle air system, a purge outlet and a regeneration inlet (24) to receive regenerative airflow from the vehicle air system. The body (12) is further provided with a chamber (28) containing a coalescing means (38) positioned between the inlet (16) and the desiccant canister (14), and a bypass valve (34) positioned between the chamber (28) and the purge outlet.

Abstract: An air dryer cartridge (10) is provided with an inlet connectable to a compressed air source, an outlet connectable to a reservoir and a desiccant (18) provided intermediate the inlet and outlet adapted to remove moisture from air passing through the air dryer cartridge (10), wherein the air dryer cartridge (10) further includes a filter (20) to capture oil droplets present in air eceived from the source, and wherein further the filter (20) is positioned downstream of the desiccant (18).

Abstract: The invention relates to a vehicle air supply system (10) adaptable to occasionally supply large volumes of air at relatively low pressure for purposes such as tyre inflation. The system has a compressor (12), an air dryer (14), a reservoir (18) adapted to receive air from the compressor via the air dryer, and control means (20) operable to cause a standard regeneration of the air dryer when a predetermined system condition is met. The control means is also operable to cause an intermediate regeneration of the air dryer in advance of said predetermined system condition being met, wherein the control means are further operable to inhibit said intermediate regeneration. The control means is operable so as to prevent saturation of an air dryer desiccant in circumstances where the compressor is on load for an extended period of time, and thus likely to be pumping a large volume.

Abstract: A rotating vane vacuum pump has a secondary inlet (4) which permits additional suction after the primary inlet (3) has closed.