Small Forged Bellows Seal Y-pattern Globe Valves for Nuclear Applications

Caractéristiques et avantages

Available for nuclear class 1, 2, and 3 and safety related applications.

• Long cycle life bellows (5000 cycles). Gr. 321 (stainless) for Class 1500, Hastelloy for Class 2500. Optional materials available on request. Designed for, and successfully tested in high pressure/temperature conditions.
• No torsion of bellows. Splined stem prevents torsion of bellows and assures long cycle life.
• Low torque due to:
  a) non-rotating stem
  b) yoke nut thrust bearings
  c) central grease fitting for lubrication of stem nut
• Two secondary stem seals:
  a) Backseat in open position
  b) Graphite packing
• In-line servicing. Stem-bellows assembly can easily be removed and replaced on valves with threaded bonnet. On seal-welded valves, removal and replacement of weld is necessary. Special tools are available for cutting the seal weld.
• Solid Stellite disc and seat. (Seat vacuum brazed).