the orifice carrier 70 recall that because of the cutouts configuration i e more than 180 degrees such orifice plate and seal plates would be restrained from radial movement the carrier can then be lowered by pins within taps 72 into recess 23 of body 10 the smooth lower surface 71 of the carrier would fit on root 24 of recess 23 and the seal within groove 78 would engage the body wall around bore 21 the orifice assembly namely seal plates 80 carrying orifice plate 84 therebetween would be positioned by groove 25 lock cap 90 would be inserted within counterbore 27 to sealingly engage lug extension 74 of orifice carrier 70 lockplate 95 would be inserted within counterbore 26 so that detent 34 engages indentation 96 bore sleeves 60 would then be inserted through opposite ends of body bore 21 until their flanges 62 engage body faces 11 and 12 and the sleeve ends 68 sealingly engage the seals carried by orifice seal plates 80 at this time bore extensions 16 17 would be bolted to body 10 by bolts 15 line pressure through a line within which such bore extensions would be inserted would pass through orifice plate 84 some upstream line fluid would exit through aperture 67 of the upstream sleeve 60 some such pressure would exit the unplugged bore 31a downstream of the orifice plate downstream fluid would exit.