Rastagroup control valve manufacturer | Series BT8000
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Series BT8000

Rasta Group BT8000, BT8200 triple-offset butterfly, shaft offsets are created by designing the valve with the shaft located behind the centerline of the sealing surface and slightly to one side of the pipe centerline. The third offset is point of intersection of tangents of seat and disc sealing deviating from the rotary center. These offsets are to completely eliminate all seat to seat rubbing throughout the valve’s entire 90 degrees of rotation. Metal seal, resilient metal seal and soft seal are optional. The triple-offset provides ANSI Class IV, V, VI leakage performance. The seat seal ring can be changed easily.
BT8000 is wafer type, BT8200 is double flanged type.

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• Quarter turn non-rubbing design is achieved by triple offset geometry, completely eliminating all seat to seal rubbing throughout the 90 degree rotation of the disc.
• Metal seat results in broader application, longer valve life and less maintenance.
• Internally and externally retained, triple blow-out prevention.
• The seat seal ring can be changed easily.
• Metal seal, resilient metal seal and soft seal are optional.
• Single-piece cast body, with face to face dimensions in accordance to ISO 5752 and API 609 provides interchan­geability with gate, high performance butterfly, plug and other valves for simpler and more flexible installation.
• Valve constructions allow material compatibility with NACE MR0175-2003, please contact Rasta Group for details.
• High performance GF TFE packing and graphite packing with live-loading to fit with low fugitive emissions APl-622.

Weight 600 lbs
Dimensions 200 x 80 x 200 in


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