Oil & GasValves
Butterfly valve body (large-bore pipeline, Class 150/300)
API 6D / EN 593. Large bore butterfly valves (DN300+) – cast body economical vs forged. NACE MR0175 for duplex. Hard-faced or SS disc.
Specifications
Material
Cast Steel WCB; WC9; CF8M (SS); Duplex CD4MCu (sour/seawater)
Grades
WCB;WC9;CF8M;CD4MCu
Material Class
DuplexCast Steel
Applicable Standards
NACE MR0175EN 593API 6D
Service Conditions
seawater
Common Processes
Green sand / resin sand (large DN); investment (smaller precision)
NDT & Inspection
RT/UT (CS); PT (SS/duplex); hydrostatic; seat leak; dimensional; PMI
Typical Specs & Notes
API 6D / EN 593. Large bore butterfly valves (DN300+) – cast body economical vs forged. NACE MR0175 for duplex. Hard-faced or SS disc.