Product Description

manual Double Flanged Wafer Type

Offset Cryogenic Butterfly Valve

Maintenance & Customer ServicesBell has a fully integrated maintenance and services department able to carry out on-site servicing world-wide that gives us a continuous feedback experience to improce valve performances.The Maintenance & Customer Services department gathers all competences to handle large turnkey maintenance operation or specific on-site services in severe evironments. Principle of operationThe Bell Triple-offset Cryogenic Butterfly Valve provide bi-directional flow capabilities. This geometry ensures that the disc seal contacts the body seat only at the final shut-off position without rubbing or galling, providing a torque generated resilient seal with sufficient "wedging" to ensure a uniform seal contact. The triple-offset geometry

Offset 1: the shaft is offset behind the seat axis to allow complete sealing contact around the entire seat.

Offset 2: the shaft centerline is offset from the pipe and valve which provides interference free opening and closing of the valve.Offset 3: the seat cone axis is offset from the shaft centerline to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat. Friction free sealing for long cycle life

The metal disc seal: torque seating during closing of the valve provides uniform forces around the entire circumference of the valve seat. The resilient seal flexes and energizes, assuming the shape of the seat. The compression forces equally distributed around the perimeter of the seal allows the valve body and disc to contract or expand, without the risk of jamming due to temperature fluctuations. It is self-adjusting. Valve parts

Design Features & Materials

Triple Offset Disc Rotation: provides Bubbles Tight sealing without rubbing or galling.

Cryogenic Stem packing (detail A): composed of suoerposed Viton 'O' - Rings and expanded graphite rings (Fire safe approved).Low fugitive emission (detail A): in accordance with ISO 15848/TA-LUFT.No cavity (detail B): the bottom cover can be removed if drainage is required.Internal Blow-out Protection (detail B): prevents the shaft from blowing out under pressure.Inherent Fire Safe Function: stainless steel construction and metallic seal (item 5) provide inherent fire safe function.Extended Bonnet (item 22): with a sufficient gas column to keep the stem packing away from cold fluid. Extended bonnet length is qualified for use in LNG application with type approvals from major Classification Societies.Actuator: manual, pneumatic (single or double acting type), electric or hydraulic according to customer specification. On/Off or Modulating actuators for energency Shut-down function (ESD) also available.High Quality Castings: radiographic control, dye penetrant test, ferrite contect control, impact test at -196°c according to customer1s requirements.Reinforced stainless steel shaft bearings: for high cycles and smooth operation at very low temperature (item 55)High reliability: Safety integraity Level requirements according to IEC 61508.Alternative materials for body, disc and other parts are available upon request to meet specific requirements Design StandardsDesign: ASME standard, CE marked (PED), ATEX certified.Face to face dimensionsL ISO 5752 (Short Pattern).Ambient temperature testing: API 598 (other type of tests available upon request)Alternative Body type (ISO Long pattern, Wafer, LUG or Butt Welded) and sizes available upon request.Flange standard: ANSI B16.5 (Sizes from 3" to 24"), ANSI B16.27 series A or B (sizes from 26" to 60"), ASME VII div.1 Appendix 2 (sizes > 60"). Other flanges standards available upon request.Cryogenic temperature testing: BS6364 (other type of tests available upon request).

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