Bolted bonnet bellows seal flexible wedge gate valves

Overview

Category: Bellows seal valves
Product line: Bellows seal bolted bonnet high pressure valves (large forged)


  • Size range(s)
    NPS 2 1/2 - 6
    (DN 65 - 150)
    Pressure rating
    ASME Classes 600 - 1500
    Standard connections
    Butt weld

Features and benefits

● Long cycle life bellows (2000 cycles) in Gr. 321 (stainless) or Inconel. Designed for, and successfully tested in high pressure/temperature conditions.
● Bellows monitoring port (optional): Connected to the space above the bellows to monitor performance.
● Non-rotating stem prevents torsion of bellows.
● Two secondary stem seals: a) Backseat in open position; b) Graphite packing.
● Forged for higher safety: Increased toughness, strength and fatigue resistance.
● Two-part bellows.
● Low torque due to: a) Non-rotating stem prevents torsion of bellows; b) Stem nut thrust bearings; c) Central lubrication.
● Seating faces hardfaced with CoCr alloy, ground and lapped. 

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