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Marine Self-closing Drain Valve

Marine Self-closing Drain Valve

Marine Self-closing Drain Valve is a specially designed marine valve used for controlled drainage and liquid discharge systems on ships and offshore facilities.

The valve features an automatic closing mechanism that returns the valve to the closed position after operation, preventing continuous leakage and accidental discharge.

Marine Self-closing Drain Valve is commonly installed on:

  • Fuel oil tanks

  • Lubricating oil tanks

  • Water tanks

  • Drain pipelines

  • Machinery spaces

  • Marine auxiliary systems

During drainage operation, the valve can be manually opened to discharge accumulated liquid. After releasing the operating force, the internal spring or weight mechanism automatically closes the valve, ensuring safe and reliable shut-off.

Overview

Working Principle of Marine Self-closing Drain Valve

Marine Self-closing Drain Valve works through a spring-loaded or weight-assisted closing mechanism.

Operating Process:

  1. The operator manually opens the drain valve.

  2. Liquid flows through the valve outlet.

  3. Drainage operation is completed.

  4. The operating force is released.

  5. The spring mechanism returns the valve stem.

  6. The valve closes automatically and stops further discharge.

Main Components of Marine Self-closing Drain Valve

ComponentFunction
Valve BodyMain pressure-containing structure
BonnetProtects internal mechanism
Valve DiscControls fluid passage
Valve SeatProvides sealing surface
Valve StemTransfers opening movement
Spring MechanismProvides automatic closing force
Handle / LeverManual operation
Drain OutletProvides discharge connection
PackingPrevents stem leakage
GasketEnsures sealing between parts

Applicable Standards of Marine Self-closing Drain Valve

Standard CategoryApplicable Standards
Marine Valve StandardsJIS F Series Marine Valve Standards
Shipbuilding StandardsCB/T Marine Valve Standards
Drain Valve StandardsMarine Piping System Requirements
Flange StandardsJIS B2220 / GB/T / DIN EN 1092
Material StandardsASTM / JIS / GB / EN Standards
Classification RequirementsCCS, ABS, DNV, LR, ClassNK

Material Selection of Marine Self-closing Drain Valve

MaterialFeaturesApplications
BronzeExcellent corrosion resistanceMarine water drainage systems
BrassGood machinability and corrosion resistanceSmall drain valves
Cast SteelHigh strength and pressure resistanceHeavy-duty drainage systems
Stainless SteelExcellent corrosion resistanceOffshore and harsh environments
Cast IronEconomical and durableGeneral drainage applications
Aluminum BronzeSuperior seawater resistanceMarine applications

Common Material Standards

MaterialStandard
BronzeJIS H5120 BC6 / ASTM B62
Cast SteelASTM A216 WCB
Stainless SteelASTM A351 CF8M
Cast IronASTM A126
Aluminum BronzeASTM B148

Technical Specifications of Marine Self-closing Drain Valve

ItemSpecification
Product NameMarine Self-closing Drain Valve
TypeAutomatic Closing Drain Valve
FunctionLiquid Drainage Control
MediumFuel Oil, Water, Lubricating Oil, Drainage Water
Installation LocationTank Bottom, Drain Pipeline, Machinery Area
Connection TypeThreaded / Flanged
Size RangeDN15-DN100
Pressure RatingPN6-PN25
OperationManual Opening + Automatic Closing
Closing MechanismSpring Loaded / Weight Type
Material OptionsBronze, Brass, Cast Steel, Stainless Steel
ApplicationShip Drainage Systems

Pressure Test of Marine Self-closing Drain Valve

Test ItemDescription
Shell Hydrostatic TestVerifies valve body strength
Seat Leakage TestChecks sealing performance
Self-closing Function TestConfirms automatic closing ability
Drainage Flow TestEnsures discharge performance
Material InspectionConfirms material quality
Dimensional InspectionEnsures installation accuracy

Advantages of Marine Self-closing Drain Valve

FeatureBenefit
Automatic Closing DesignPrevents accidental fluid loss
Reliable SealingReduces leakage risk
Marine Grade MaterialsSuitable for ship environments
Compact StructureEasy installation
Safety-oriented DesignImproves onboard operation safety

Typical Applications

ApplicationFunction
Fuel Oil Tank DrainRemoves water and sediment from tanks
Lubricating Oil SystemControls oil drainage
Fresh Water TankProvides controlled discharge
Machinery SpaceRemoves accumulated liquid
Ballast SystemControls drainage operation
Marine Auxiliary SystemProvides safe fluid discharge


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