Bellow Seal Globe Valve Indonesia – Long cycle life bellows (3000 cycles) in Gr. 321 (stainless) or Inconel. Designed and successfully tested in high pressure/temperature conditions. Two-part bellows, Two secondary stem seals: a) Backseat in open position; b) Graphite packing. Low torque due to: a) Non-rotating stem prevents torsion of bellows; b) Stem nut thrust bearings; c) Central lubrication. Bellows monitoring port (optional): A plug can be connected to the space above the bellows to monitor performance.