Design Basis
In NACE MR0175 WCB Gate Valve Class 600, the Wedge Gate 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 NACE MR0175 WCB Gate Valve Class 600, the pressure boundary is WCB. Cast carbon steel for general hydrocarbon and process pressure boundaries. Because this valve is Class 600 with RF / RTJ / BW, verify the material condition, trim compatibility, bolting and any PMI/NDE or corrosion-control requirement as one package.
Pressure Class and Piping Interface
For NACE MR0175 WCB Gate Valve Class 600, the specified rating is Class 600 and the piping interface is RF / RTJ / BW. Higher-pressure service where pressure-boundary dimensions, bolting and operating loads become more significant. Raised-face, ring-type-joint or butt-weld ends change flange/gasket or weld preparation and should be fixed before drawing approval. 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 NACE MR0175 WCB Gate Valve Class 600, 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 600 loading and the selected Handwheel / Gear operating method.
Operation and Actuation
For NACE MR0175 WCB Gate Valve Class 600, operation is Handwheel / Gear. Manual handwheel/gear selection should keep rim pull and operating effort practical at the maximum specified differential pressure. 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
NACE MR0175 WCB Gate Valve Class 600 is explicitly associated with sour-service material control; confirm the service-specific material, sealing, inspection and qualification requirements in the purchaser specification.
Inspection and Testing
For NACE MR0175 WCB Gate Valve Class 600, tie MTC/heat traceability, dimensional inspection, PMI/NDE where specified, shell/seat testing, coating checks, witness points and final records to the approved API 600 datasheet and ITP.
Documents Before Release
The manufacturing release for NACE MR0175 WCB Gate Valve Class 600 should reference the approved GA, material/trim schedule, seat/seal definition, operator or actuator data, test scope and required final documentation.