Design Basis
Ductile Iron Bidirectional Knife Gate Valve PN16 is built around Bidirectional Knife Gate Valve. The buyer should confirm pressure direction, gate guidance, body style, packing exposure, seat access and whether the construction suits solids-bearing service.
Pressure-Boundary Material
Ductile iron suits many water and wastewater duties when pressure, coating and corrosion conditions are compatible; seat chemistry and external coating should be defined. PN16 increases the nominal pressure range, but the permitted differential pressure of a knife gate valve may vary with size, seat and body design, so the datasheet limit must be confirmed. Resilient seating can improve shutoff in compatible water/slurry media, but elastomer chemistry, temperature, abrasion and replaceability should be checked.
Pressure Class and Piping Interface
For Ductile Iron Bidirectional Knife Gate Valve PN16, PN16 is a nominal rating and the interface is Wafer / Lug. Maximum differential pressure must be confirmed by size, pressure direction, seat arrangement, packing and actuator thrust instead of assumed from rating alone.
Seat and Seal Arrangement
Ductile Iron Bidirectional Knife Gate Valve PN16 uses EPDM / NBR / project specific. Confirm shutoff expectation, elastomer or metal-seat compatibility, abrasion, temperature, replaceability and solids clearing behavior before quotation.
Operation and Actuation
Manual operation should keep handwheel or gear effort practical at the maximum specified differential pressure and expected packing/gate friction.
Service Conditions
Ductile Iron Bidirectional Knife Gate Valve PN16 is mapped for Wastewater / utility isolation. Confirm actual media, solids concentration or fiber content, pressure cases, temperature range and cycling duty before release.
Inspection and Testing
For Ductile Iron Bidirectional Knife Gate Valve PN16, align MTC/heat traceability, dimensional inspection, pressure/leakage testing, coating or surface checks, actuator functional testing and witness points with the approved datasheet and ITP.
Documents Before Release
Manufacturing release for Ductile Iron Bidirectional Knife Gate Valve PN16 should reference the approved GA, face-to-face/interface details, material schedule, seat/packing definition, operator or actuator data and final inspection-document index.