NOVELTY - Several vessels (12) holding gas adsorbent, feed manifold (20), product manifold (22) and exhaust manifold (24) are connected through conduits. The gas flow is controlled though rotary product and feed valves (28) or series of open/shut valves in PSA system. A controller control the valves so that vessels passes through equalization, blow-own, purge, pressurization and production stages repeatedly, to purify the gas.    USE - For operating pressure swing adsorption system which purifies feed gas into hydrogen rich gas used in fuel cells which is utilized as power source for vehicles.    ADVANTAGE - A compact PSA system is obtained. The rotary valve provides compact, simple and quiet and continuous structure. The PSA system operates at ambient temperature so as to deliver the purified hydrogen while the vessels are warming up to their operating temperature. Hydrogen rich gas is obtained reliably.    DETAILED DESCRIPTION - The PSA purifies the reformate feed gas into hydrogen product which is directly fed into fuel cell. The reformate feed gas contains 59% hydrogen. The product gas contains 95% hydrogen and 1 ppm of carbon monoxide. The primary adsorbent in the vessels is selected from the group of zeolite 5A, Zeolite LiX and combinations and the secondary adsorbent is selected from the group of activated carbon, activated alumina, zeolite 4A, and combinations. The adsorbent in the vessels contain carbon dioxide, carbon monoxide, nitrogen, water, methane, ethane, propane, butane, ethylene, propylene, hydrogen sulfide and ammonia. The PSA system operates at pressure below 7 atmospheres and at temperature between 20-100 degrees C. The vessels are in 5 or 9 in numbers.    An INDEPENDENT CLAIM is also included for the pressure swing adsorption system for purification of feed gas into product gas.    DESCRIPTION OF DRAWING(S) - The figure shows a top view of the pressure swing adsorption system.    vessels (12)    feed manifold (20)    product manifold (22)    exhaust manifold (24)    valves (28)