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Size Range(s)
NS 2-12
(DN 50-300)

Pressure Rating
ASME Classes 150-600

Standard Connections
Flanged, Butt weld


Benefit :

  • Long cycle life bellows (2000 cycles) in Gr. 321 (stainless), Inconel for special applications, (may be replaced with Monel trim to resist corrosion or Hastelloy C for chlorine service).
  • Improved body-bonnet joint: Graphite reinforced with SS foil gasket for Class 150 valves. Fully-encased, spiral wound graphite-filled Gr. 316 (stainless) gasket for Classes 300-600.
  • Bolted body-bonnet for fast serviceability. Hermetically-sealed bonnets available for Classes 300 and 600.
  • Two or three section bellows assembly.
  • Non-rotating stemprevents torsion of bellows.
  • Two secondary stem seals: a) Backseat in open position; b) Graphite packing.
  • Welded-in seat hardfaced with CoCr alloy.
  • Wedge hardfaced with CoCr alloy for long life.
  • Seating faces hardfaced with CoCr alloy, ground and lapped.


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