In particular chemical processes the fluids in the pipes are often toxic, radioactive and hazardous. Bellow sealed valves are used to prevent leakage of any toxic chemical to the atmosphere. The bellow can be supplied in different materials like 316Ti, 321, C276 or Alloy 625. Body material can be selected from all available materials.
Long cycle life bellows – 3000 cycles
Non-rotating stem prevents torsion of bellows.
Two secondary stem seals: a) Backseat in open position; b) Graphite packing.
Seating faces hardfaced with CoCr alloy, ground and lapped.