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ANSI Marine Angle SDNR Valve

ANSI Marine Angle SDNR Valve

ANSI Marine Angle SDNR Valve (ANSI Angle Screw Down Non Return Valve) is a marine valve designed according to ANSI and ASME standards for ship piping systems and offshore applications.

The valve combines shut-off and non-return functions in a single valve body, providing manual flow isolation and automatic prevention of reverse flow.

The angle pattern design allows efficient piping arrangement, reduced installation space, and improved flow direction in marine systems.

ANSI Marine Angle SDNR Valve is widely used in:

  • Marine seawater cooling systems

  • Ballast water systems

  • Bilge systems

  • Fire protection systems

  • Fuel oil systems

  • Boiler and steam systems

  • Offshore platforms

Overview

Working Principle of ANSI Marine Angle SDNR Valve

ANSI Marine Angle SDNR Valve operates through a screw-down mechanism combined with a non-return function.

The valve controls the medium flow through the movement of the disc:

  1. The handwheel rotates the valve stem.

  2. The stem moves the disc vertically.

  3. When opened, the medium passes through the angled flow channel.

  4. When closed, the disc seals against the valve seat.

  5. When reverse pressure occurs, the disc automatically closes to prevent backflow

Main Components of ANSI Marine Angle SDNR Valve

ComponentFunction
Valve BodyProvides pressure containment and angled flow passage
BonnetProtects internal components and provides sealing
DiscControls opening, closing, and check function
Valve SeatProvides sealing surface
StemTransfers operating force
HandwheelProvides manual valve operation
YokeSupports operating mechanism
PackingPrevents leakage around the stem
GasketEnsures bonnet sealing
FastenersSecure valve assembly

Applicable Standards of ANSI Marine Angle SDNR Valve

Standard CategoryApplicable Standards
Valve Design StandardsASME B16.34, API Valve Standards
Flange StandardsASME B16.5, ASME B16.47
Pressure RatingANSI Class 150, Class 300, Class 600
Material StandardsASTM Material Standards
Pressure TestingAPI 598, API 6D, ISO 5208
Welding StandardsASME Section IX
Marine ClassificationABS, DNV, LR, BV, CCS

Material Selection of ANSI Marine Angle SDNR Valve

MaterialFeaturesApplications
Cast IronEconomical and durableGeneral marine systems
Ductile IronHigher strength and impact resistanceMedium pressure systems
BronzeExcellent seawater corrosion resistanceMarine seawater applications
Carbon SteelHigh strength and pressure capabilityIndustrial marine systems
Stainless SteelExcellent corrosion resistanceOffshore and harsh environments
BrassGood corrosion resistance and machining performanceAuxiliary systems

Common Material Standards

MaterialStandard
Cast IronASTM A126
Ductile IronASTM A536
Carbon SteelASTM A216 WCB
Stainless SteelASTM A351 CF8M
BronzeASTM B62

Technical Specifications of ANSI Marine Angle SDNR Valve

ItemSpecification
Product NameANSI Marine Angle SDNR Valve
TypeAngle Screw Down Non Return Valve
StandardANSI / ASME Standards
FunctionShut-off and Non-Return
MediumSeawater, Fresh Water, Oil, Air, Steam
Size RangeNPS 1/2 - NPS 24 (According to Requirements)
Pressure RatingClass 150 / 300 / 600
Connection TypeFlanged End
Flange StandardASME B16.5
OperationManual Handwheel
Body MaterialCast Iron / Bronze / Steel / Stainless Steel
InstallationMarine Piping Systems
ApplicationShipbuilding, Offshore, Marine Engineering

Pressure Test of ANSI Marine Angle SDNR Valve\

Test ItemDescription
Shell Hydrostatic TestVerifies valve body strength
Seat Leakage TestConfirms sealing performance
Backflow TestEnsures non-return function
Pressure Holding TestChecks pressure stability
Material InspectionConfirms material compliance
Final InspectionEnsures shipment quality

Advantages of ANSI Marine Angle SDNR Valve

FeatureBenefit
ANSI Standard CompatibilitySuitable for international marine projects
Combined Shut-off & Check FunctionReduces piping components
Angle StructureProvides installation flexibility
High Pressure CapabilitySuitable for demanding applications
Marine Material OptionsReliable corrosion resistance

Typical Applications

ApplicationFunction
Seawater Cooling SystemControls cooling water flow
Ballast SystemPrevents reverse water flow
Bilge SystemProvides drainage control
Fire Protection SystemProvides emergency isolation
Fuel Oil SystemControls fuel flow
Offshore Pipeline SystemEnsures reliable fluid control


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