via ports 50 to the outlet connection b the array embodiment 10 39 of fig4 and 5 will be seen to be identical to that of fig2 and 3 except for the placement and utilization of o ring seals specifically the o ring seals in fig4 and 5 are located in radially outwardly open circumferential grooves 65 66 in the respective convex cylindrical lands of the tubular members 15 39 and 17 39 and these seals are designated with primed notation 65 39 66 39 that is correlated with the identification of the grooves to which they are fitted this being the configuration it will be understood that when the multi stage array 10 39 of fig4 and 5 is assembled to the casing 11 12 of fig1 the compliant discs 35 36 fit continuously to the respective end areas of the assembled array and in axially compressed loading as determined by the threaded advance of closure 12 at 13 as explained in u s pat no 4 921 014 each of the radial passages of the respective tubular members is preferably configured as a frusto conical diffuser expanding from a radially inner entrance to a radially outer exit illustratively this expansion may be 1 2 in diameter 1 4 in section area as from 0 010 inch diameter to 0 020 inch diameter these illustrative numbers apply for valve structure involving an array 10 or 10 39 of as.