Design Basis
In Cryogenic F51 Triple Offset Butterfly Valve Class 300, the Cryogenic Triple Offset Butterfly Valve construction determines the closure support, body arrangement and maintenance approach. Confirm bore or flow path, body joint, stem/shaft retention, seat support, anti-blowout features where applicable and access requirements against the approved GA.
Pressure-Boundary Material
For Cryogenic F51 Triple Offset Butterfly Valve Class 300, the pressure boundary is F51. Duplex stainless-steel forging requiring controlled heat treatment and corrosion performance. Because this valve is Class 300 with Wafer / Lug / Flanged, verify the material condition, trim compatibility, bolting and any PMI/NDE or corrosion-control requirement as one package.
Pressure Class and Piping Interface
For Cryogenic F51 Triple Offset Butterfly Valve Class 300, the specified rating is Class 300 and the piping interface is Wafer / Lug / Flanged. Medium pressure service with heavier flanges, bolting and wall sections than class 150. Body style changes bolting, face-to-face, dead-end capability and installation envelope. Final dimensions and pressure-temperature suitability must therefore be checked against the selected material and design temperature, not inferred from class alone.
Seat and Seal Arrangement
For Cryogenic F51 Triple Offset Butterfly Valve Class 300, the listed sealing basis is Metal Seat. Metal seating shifts the design toward hardfacing/coating, lapping, higher torque and wear control rather than polymer-seat compliance. Confirm leakage acceptance, pressure/temperature limits and cycling together with the Class 300 loading and the selected Gear / Actuator operating method.
Operation and Actuation
For Cryogenic F51 Triple Offset Butterfly Valve Class 300, operation is Gear / Actuator. Gear or powered actuation should be selected from the valve torque curve, maximum differential pressure, operating frequency and required closing time. The final operator or actuator basis should use the actual size, maximum differential pressure, Metal Seat friction/seating behavior and required operating or emergency time.
Service Conditions
Cryogenic F51 Triple Offset Butterfly Valve Class 300 is explicitly associated with cryogenic / LNG temperature service; confirm the service-specific material, sealing, inspection and qualification requirements in the purchaser specification.
Inspection and Testing
For Cryogenic F51 Triple Offset Butterfly Valve Class 300, tie MTC/heat traceability, dimensional inspection, PMI/NDE where specified, shell/seat testing, coating checks, witness points and final records to the approved API 609 datasheet and ITP.
Documents Before Release
The manufacturing release for Cryogenic F51 Triple Offset Butterfly Valve Class 300 should reference the approved GA, material/trim schedule, seat/seal definition, operator or actuator data, test scope and required final documentation.