136 ports 140 and 142 are connected with lines 44 and 46 fig1 respectively as such the rotation of regenerator housing 102 about axis a a sequentially places lines 44 and 46 in fluid communication with at least two stages 112 of mcm at any one time as will be further described second seal 138 has a second inlet port 144 and a second outlet port 146 and is positioned adjacent to second valve 116 as shown ports 144 and 146 are positioned 180 degrees apart about the circumferential direction c of second seal 116 however other configurations may be used for example ports 144 and 146 may be positioned within a range of about 170 degrees to about 190 degrees about the circumferential direction c as well second valve 116 and regenerator housing 102 are rotatable relative to second seal 138 ports 144 and 146 are connected with lines 50 and 48 fig1 respectively as such the rotation of regenerator housing 102 about axis a a sequentially places lines 48 and 50 in fluid communication with at least two stages 112 of mcm at any one time as will be further described notably at any one time during rotation of regenerator housing 102 lines.