The primary seal is formed by an interference fit between the disc hub and the seat flat. The secondary seal is an interference fit between the stem and seat stem hole. These seals prevent line media from coming into contact with other valve components. Ultraflo’s Disc edge is CNC machined and hand polished to produce bubble tight shut off, minimum torque and longer seat life. Discs are available in a variety of materials and custom coatings. The Stem is constructed of 17-4 ph Stainless Steel for high strength and includes industry standard connections for actuator mounting. The Upper Stem Bushing absorbs operator side thrusts, provides precision alignment to ensure less wear and lowers operating torque. The Lower Stem Bushing eliminates gaulding and frozen stems. Both upper and lower bushings are heavy duty non-corrosive thermoplastic polymer. A Stem Packing prevents external contaminants from entering the stem bore. The one-piece Body is offered in wafer or lug style. All 400/422 Series valve bodies are designed to fit between ASME/ANSI 125 or 150 lb. flanges. Body Recesses accommodate lightweight flanges. All sizes of Cast Iron, Nodular Iron and Aluminum bodies have a CNC machined Top Plate with standardized drilling for total actuator and operator interchangeability. A handle notch plate is supplied with the manual handle kit.