Ultraflo 399-392 Series

Ultraflo proudly offers the 399/392 Series sanitary/chemical butterfly valve. The 399/392 Series provides a bi-directional pressure rating of 150 psi with stainless steel disc/stems and 100 psi with encapsulated disc/stems. Undercut disc/stems, rated for 50 psi and requiring less operating torque, are also available. The 399/392 Series has been designed for applications requiring high flow, minimal product entrapment and complete protection of valve components from the line media. Valve sizes are from 2” – 12”. 399 valves are Wafer style bodies offered in Stainless Steel, Cast Iron and Aluminum. 392 valves are Lug style bodies offered in Stainless Steel and Nodular Iron.

 Ultraflo’s resilient Seat is the heart of all 300 Series valves. The seat incorporates a dovetail retention system ensuring positive alignment and ease of assembly. The PTFE liner, as shown below, is isostatically molded to extend up through the stem hole, completely isolating the elastomer backing from the line media in the event of primary seal failure. All 300 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 for 2”–12” valves, 50 psi for 14”– 24” valves.


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 ultrathin one-piece Disc/Stem provides a high flow capacity with smooth flow characteristics that greatly reduce line media pressure drops. The disc edge is CNC machined and hand polished to produce bubble tight shut off, minimum torque and longer seat life. 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 Split Body design simplifies field maintenance by eliminating the need for special tools or presses during installation of replacement seats. All 300 Series valve bodies are designed to fit between ASME/ANSI 125 or 150 lb. flanges. Body Recesses accommodate lightweight flanges. Body Bolt materials are zinc plated carbon steel or stainless steel as standard.


  • Size Range: 2″-12″ (50mm – 300mm)
  • Body Style: Wafer, Lug
  • Temperature Range: -40°F to 400°F (-40°C to 204°C)
  • Pressure Ratings: Bidirectional: 150 psi – 50 psi
  • Body Materials: Cast Iron, Nodular Iron and Investment Cast 316 Stainless Steel. Aluminum bodies available in wafer only.
  • Disc/Stem Materials: 17-4 Stainless Steel and Investment Cast 316 Stainless Steel, available with satin or high polish finish. PTFE encapsulated and other custom disc coatings are available.
  • Seat Materials: PTFE lined, EPDM, Nitrile, Buna, FKM. Nitrile seats are available in FDA food grade white.
  • Applications: Sanitary, Chemical and Corrosive Applications