Abstract: A choke valve body of a valve apparatus includes a lower stem that terminating at a lower end thereof with a plug. A conduit traverses a lower portion of the lower stem between at least one plug aperture traversing the plug to at least one top aperture traversing an upper end of the lower portion. The lower portion is slidably retained within the valve chamber between closed and open positions. A bonnet fixed with the valve body has a bonnet chamber for receiving the lower portion, and a bore with at least one annular seal for slidably retaining an upper portion. A yoke assembly is fixed with the bonnet, terminates at an upper end with a drive mechanism, and includes an upper stem with a threaded upper end that is driven between raised and lowered positions by the drive mechanism, the upper stem fixed with the lower stem.