Fluid sampling valve

Claim 1

IN A VALVE, A PLURALITY OF SIMILAR DISCS EACH HAVING A CENTRAL BORE THERETHROUGH, MEANS SECURING SAID DISCS TOGETHER IN STACKED RELATION TO FORM A VALVE BODY WHEREIN THE ALIGNED CENTRAL BORES PROVIDE A CYLINDER, EACH OF SAID DISCS HAVING A PLURALITY OF LONGITUDINALLY-EXTENDING HOLES THEREIN SOME OF WHICH ARE ALIGNED WITH RESPECTIVE HOLES IN THE OTHER DISCS TO FORM A PLURALITY OF LONGITUDINALLY-EXTENDING FLUID PASSAGES AND EACH DISC HAVING ALSO A TRANSVERSELY-EXTENDING HOLE COMMUNICATING WITH THE CENTRAL BORE IN THE SAME DISC, CERTAIN OF SAID LONGITUDINALLY-EXTENDING PASSAGES BEING IN FLUID COMMUNICATION WITH CERTAIN OF SAID TRANSVERSELY-EXTENDING HOLES; A PISTON MEMBER MOUNTED FOR MOVEMENT IN SAID CYLINDER, AND AN O-RING FIXEDLY MOUNTED BETWEEN EACH PAIR OF ADJACENT DISCS AND SEALINGLY ENGAGING THE OUTER SURFACE OF SAID MEMBER TO SEPARATE THE ANNULAR SPACE BETWEEN SAID MEMBER AND THE WALL OF SAID CYLINDER INTO A PLURALITY OF ANNULAR CHAMBERS WITH WHICH SAID TRANSVERSELY-EXTENDING HOLES RESPECTIVELY COMMUNICATE, SAID MEMBER HAVING THEREIN A CHANNEL OPERATING TO INTERCONNECT A PAIR OF ADJACENT CHAMBERS SELECTED IN ACCORDANCE WITH THE POSITION OF SAID MEMBER.