Ultraflo’s resilient Seat is the heart of all 410/412 Series valves. The seat design offers lower torque and complete isolation of the line media from the valve body. A tongue and groove seat retention system ensures positive alignment and ease of assembly. All 400 Series seats include a flange seal molded into the seat face providing a positive seal with all popular flanges. Valves installed in dead end service (downstream flange removed) are derated to 75 psi. 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. Taper Pins with O-ring seals are mechanically locked for maximum torsional capacity and vibration resistance. The one-piece heavy duty, high strength Stem includes industry standard connections for actuator mounting. The heavy wall bronze Stem Bushing (410 models only) absorbs operator side thrusts. Upper and Lower Stem Bearings (412 models only) provide precision alignment to ensure less wear and lower operating torque. The Thrust Bearing eliminates disc displacement due to stem and disc weight. All size bodies have a CNC machined Top Plate with standardized drilling for total actuator and operator interchangeability.