The Flowserve Super Nordstrom plug valve carries on the Nordstrom tradition of valving excellence. Complementing the broad line of Dynamic Balance plug valves, the Super Nordstrom valve offers dependable, bubble-tight shut-off and predictable torque in an economical line of valves in a smaller size range (1/2 through 4) for low to medium pressure (ANSI classes 150, 300 and 600).
The Super Nordstrom design features a stainless steel spring that is compressed between the small end of the plug and body. This applies a constant force to the plug, tending to lift it out of the taper. This movement of the plug, however, is limited by stainless steel controlled-dimension washers located between the large end of the plug and cover. The “controlled-balance” effect is maintained by the spring pressure at the small end of the plug and the controlled dimension washers at the large end.
Extensive testing – not to mention years of experience with Dynamic Balance plug valves – has shown that this precisely controlled vertical lifting of the plug eliminates wedging of the plug in the body taper without affecting tight shut-off. The plug is permanently adjusted at plant assembly by selection of the proper washers – thereby eliminating the need for field readjustment.