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GB Marine Angle SDNR Valve

GB Marine Angle SDNR Valve

GB Marine Angle SDNR Valve (GB Angle Screw Down Non Return Valve) is a marine valve designed according to Chinese national standards and shipbuilding industry requirements.

The valve combines shut-off and non-return functions in one structure, allowing manual flow control while preventing reverse flow in marine piping systems.

With an angle pattern design, GB Marine Angle SDNR Valve provides efficient flow direction change, reduced installation space, and reliable operation under marine working conditions.

GB Marine Angle SDNR Valve is widely used in:

  • Ship seawater cooling systems

  • Ballast water systems

  • Bilge systems

  • Fire fighting systems

  • Fuel oil systems

  • Marine auxiliary piping systems

  • Offshore engineering systems

Overview

Working Principle of GB Marine Angle SDNR Valve

GB Marine Angle SDNR Valve operates through a screw-down mechanism with an automatic non-return function.

The valve controls fluid 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 flows through the angled valve passage.

  4. When closed, the disc contacts the valve seat to stop flow.

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

Main Components of GB Marine Angle SDNR Valve

ComponentFunction
Valve BodyProvides pressure resistance and angled flow channel
BonnetProtects internal components and provides sealing
DiscControls flow opening and closing
Valve SeatProvides reliable sealing surface
StemTransfers operating force to the disc
HandwheelProvides manual operation
YokeSupports operating mechanism
PackingPrevents leakage around the stem
GasketEnsures bonnet sealing
FastenersConnect valve components securely

Applicable Standards of GB Marine Angle SDNR Valve

Standard CategoryApplicable Standards
Marine Valve StandardsGB/T Marine Valve Standards, CB/T Marine Valve Standards
Valve Design RequirementsGB/T 12235, GB/T Valve Standards
Flange StandardsGB/T 9112, GB/T 9113, CB/T Marine Flange Standards
Pressure RatingPN0.6, PN1.0, PN1.6, PN2.5
Material StandardsGB/T, ASTM, EN Material Standards
Pressure TestingGB/T 13927, ISO 5208, API 598
Marine ClassificationCCS, ABS, DNV, LR, BV

Technical Specifications of GB Marine Angle SDNR Valve

ItemSpecification
Product NameGB Marine Angle SDNR Valve
TypeAngle Screw Down Non Return Valve
StandardGB/T & CB/T Marine Valve Standards
FunctionShut-off and Non-Return
MediumSeawater, Fresh Water, Oil, Air, Steam
Size RangeAccording to GB Marine Requirements
Pressure RatingPN0.6 / PN1.0 / PN1.6 / PN2.5
Connection TypeFlanged End
Flange StandardGB/T 9112 Series
OperationManual Handwheel
Body MaterialCast Iron / Bronze / Steel / Stainless Steel
InstallationMarine Piping Systems
ApplicationShipbuilding, Offshore, Marine Engineering

Pressure Test of GB Marine Angle SDNR Valve

Test ItemDescription
Shell Hydrostatic TestVerify valve body pressure strength
Seat Leakage TestConfirm sealing performance
Non-Return Performance TestVerify automatic closing function
Pressure Holding TestEnsure pressure reliability
Material InspectionConfirm material specification
Final InspectionEnsure product quality before shipment

Material Selection of GB Marine Angle SDNR Valve

MaterialFeaturesApplications
Cast IronEconomical and durableGeneral marine piping systems
Ductile IronHigher strength and impact resistanceMedium pressure applications
BronzeExcellent seawater corrosion resistanceSeawater systems
Cast SteelHigh strength and pressure resistanceHigh pressure marine systems
Stainless SteelExcellent corrosion resistanceOffshore and harsh environments
BrassGood corrosion resistance and machinabilityAuxiliary marine systems

Common Material Standards

MaterialStandard
Cast IronGB/T 9439
Ductile IronGB/T 1348
Cast SteelGB/T 12229 / ASTM A216 WCB
BronzeGB/T 1176
Stainless SteelGB/T 12230 / ASTM A351

Advantages of GB Marine Angle SDNR Valve

FeatureBenefit
GB/CB Standard ComplianceSuitable for Chinese shipbuilding projects
Combined Valve FunctionSaves installation space
Angle StructureImproves piping arrangement flexibility
Marine Grade MaterialsSuitable for seawater environments
Reliable SealingEnsures safe vessel operation

Typical Applications

ApplicationFunction
Seawater Cooling SystemControls cooling water flow
Ballast SystemPrevents reverse water flow
Bilge SystemProvides safe drainage control
Fire Fighting SystemEnsures reliable isolation
Fuel Oil SystemControls fuel pipeline flow
Marine Auxiliary SystemProvides fluid control


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