Parts of oil and/or gas wellhead machines, namely, control valves for regulating the flow of gases and liquids for use in the oil and gas industry; parts of oil and/or gas wellhead machines, namely, linear actuators with hydraulic or pneumatic operation as parts of machines for regulating the flow of gases and liquids for use in the oil and gas industry; parts of oil and/or gas wellhead machines, namely, valves, valve bodies, bonnet seal rings, valve bonnet yokes, valve bonnets, bumper plug valves, bushings, caps, chain guides, couplings, cross fittings, disc holders, disc lock nuts, disc spreaders, disc valve elements, disk carriers, elbows, expansion joints, expansion sleeves, flanges, fusible plugs, valve glands, guide collars, hand wheels, hinge pins, levers, links, lock nut keys, nipples, packing nuts, packing rings, plugs, reduction fittings, return bends, seat rings, side plugs, sprocket wheels, stems, stuffing box studs, swing joints, swivel couplings, templates, thrust plates, t-valves, unions and y fittings, yoke arms, yoke stem bushings, and yokes