packing compression sleeve 47 is superimposed on each packing gland 45 to compress the material of the packing gland 45 and insure that there is a fluid tight seal a compression flange 49 is fixed to each packing compression sleeve 47 about as shown in fig8 and 9 a plurality of draw fasteners are used to secure the compression flanges 49 to the sleeve flanges 43 and to draw the packing compression sleeve inwardly into the bearing support sleeves 39 to compress the packing glands such a draw fastener is illustrated as a nut and bolt assembly 51 as shown in fig7 the pivotable shaft 23 extends outwardly further from the bearing support sleeve 39 and packing compression sleeve 47 on one end than it does on the other this further extension is the opeator end 53 of the pivotable shaft 23 mounted to the operator end 53 is a means for pivoting 55 the pivotable shaft 23 as illustrated in fig7 and 8 this means for pivoting may be a lever for manual operation of the center link disc valve it could also be a wheel or a crank etc powered means for pivoting 55 could also be utilized for example an hydraulic cylinder operable with a lever or a gear reduced electric motor in the preferred embodiment an hydraulic cylinder not shown is utilized in conjunction with the lever shown in fig7 and 8 fixed to each plate flange 33 inboard from the point at which that plate flange 33 is attached to the corresponding tubular extension 27 is a track suspension sleeve 57 which extends inwardly toward the center of the valve from the plate flange 33 and is concertric with that corresponding tubular extension.