Products

Triple Offset Valve

Triple Offset Butterfly Valves Series 68 for Tight Shutoff, High Temperatures and Extreme Service Conditions


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General Description

The “Triple Offset” butterfly valve is available in a variety of both ANSI and PN classes, sizes and configurations.

How it Works:

The disc of a “Triple Offset” valve is not centered in the pipeline; instead it is slightly off center. The outside edge of the disc is machined to form a conic elliptical perimeter, allowing the placement of the disc to be shifted three times from the valve’s sealing surface (seat). The first offset occurs as the shaft is placed behind the valve seat, allowing for a continuous sealing surface. Offset two, shifts the disc to one side of the pipeline. This allows the disc to lift off of the seat when rotated 90°. The third offset angles the seat and disc from the centerline of the pipeline. This entirely removes the possibility of interference between the disc and valve body when rotating.

Features:

TYPICAL APPLICATIONS

  • Process fluids
  • Hydrocarbons
  • Steam/Geothermal steam
  • Hot gas/Sour gas (NACE)
  • Blow down
  • Sulfur recovery
  • Acid, Caustic, Chloride
  • Abrasive service

PRODUCTION RANGE

  • ND 3" - 112" ANSI Class 150
  • ND 3" - 60" ANSI Class 300
  • ND 3" - 48" ANSI Class 600
  • ND 6" - 32" ANSI Class 900
  • ANSI Class 1500 with ANSI Class 900 trims

BODY STYLE

  • Double flanged ISO 5752
  • Double flanged ANSI B 16.10 (gate)
  • Wafer & Lugged API 609
  • Butt-Weld

PRESSURE RANGE

  • From Full Vacuum up to +250 Bar

MATERIALS

  • Carbon steel WCB
  • Stainless steel CF8,CF8M
  • Alloy steel WC6, WC9
  • LCB, LC3
  • Duplex
  • Super duplex
  • Monel
  • Hastelloy
  • Inconel
  • Alloy 20
  • Aluminum Bronze
  • Titanium

APPLICABLE STANDARDS

  • Design: API 609/ANSI B16.34/ASME VIII
  • Face to face: API/ISO/ANSI/ASME
  • Flange: ANSI/ISO/DIN/UNI/JIS
  • Testing: API 598/ISO5208
  • Fire Test: BS 6755 - API 607


Temperature:

From -40°C up to +815°C (1435F)

Additional Information