Twin tower air dryer

A twin tower gas drying system for cleaning and drying a stream of unpurified pressurized gas received from a source thereof for use by a pneumatic system, said gas drying system comprising:

• a relatively shallow manifold block provided with a plurality of passageway and ports,
• a separator and sump connected to said block and to one of said plurality of ports for initially separating moisture and other particulates from such stream of unpurified gas before directing the remainder of the stream to the one port of said plurality of ports provided in said block,
• a pair of removable, relatively shallow and circular shuttle valves threadably mounted into openings provided in an external surface of said block and located opposite that of the separator and sump
• a pair of desiccant containing canisters for threading respectively to said pair of shuttle valves,
• said canisters and shuttle valves being, in addition, connected in fluid communication with certain of the ports and passageways of said plurality provided in the block to supply and remove pressurized air from the canisters,
• said ports including further:
• at least one port for discharging dry, clean air from said block,
• at least one port for exhausting purged air to the atmosphere from said block, and
• a port provided in said sump for releasing to atmosphere particles and liquid collected in the sump.