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JIS Marine Self-closing Valve

JIS Marine Self-closing Valve

IS Marine Self-closing Valve is a self-operated marine valve designed according to Japanese Industrial Standards (JIS) for ship piping systems.

The valve is equipped with an automatic closing mechanism that returns the valve to the closed position after operation, helping prevent unintended fluid leakage and improving onboard safety.

JIS Marine Self-closing Valve is commonly installed in:

  • Fuel oil systems

  • Lubricating oil systems

  • Tank sounding systems

  • Drainage systems

  • Marine auxiliary pipelines

  • Ship machinery systems

The self-closing function makes the valve especially suitable for applications where temporary opening is required and automatic shut-off protection is necessary.

Overview

Working Principle of JIS Marine Self-closing Valve

JIS Marine Self-closing Valve operates through a spring-loaded or weight-assisted closing mechanism.

When the valve is manually opened, the internal disc moves away from the seat, allowing fluid flow.

After the operating force is released:

  1. The spring or weight mechanism activates.

  2. The stem returns to the original position.

  3. The disc moves toward the valve seat.

  4. The flow passage closes automatically.

  5. Leakage and unnecessary discharge are prevented.

Main Components of JIS Marine Self-closing Valve

ComponentFunction
Valve BodyProvides pressure containment and flow passage
BonnetProtects internal valve mechanism
DiscControls opening and closing
Seat RingProvides sealing surface
StemTransfers operating movement
Spring DeviceProvides automatic closing force
Operating HandleOpens valve manually
PackingPrevents stem leakage
GasketEnsures body sealing
Bolts & NutsSecure valve assembly

Applicable Standards of JIS Marine Self-closing Valve

Standard CategoryApplicable Standards
Marine Valve StandardsJIS F Series Marine Valve Standards
Japanese Industrial StandardsJIS Standards
Flange StandardsJIS B2220
Thread StandardsJIS B0203 / JIS Pipe Threads
Material StandardsJIS Material Standards
Testing StandardsJIS / API / ISO Testing Requirements
Classification RequirementsClassNK, CCS, ABS, DNV, LR

Material Selection of JIS Marine Self-closing Valve

MaterialFeaturesApplications
BronzeExcellent seawater corrosion resistanceMarine water systems
BrassGood corrosion resistance and machining performanceSmall marine valves
Cast SteelHigh strength and pressure resistanceFuel oil and industrial systems
Stainless SteelExcellent corrosion resistanceOffshore applications
Cast IronEconomical and durableGeneral drainage systems
Aluminum BronzeSuperior seawater resistanceMarine applications

Common Material Standards

MaterialStandard
BronzeJIS H5120 BC6 / ASTM B62
Cast SteelJIS G5121 / ASTM A216 WCB
Stainless SteelJIS G5121 / ASTM A351 CF8M
Cast IronJIS G5501
Aluminum BronzeJIS H5120

Technical Specifications of JIS Marine Self-closing Valve

ItemSpecification
Product NameJIS Marine Self-closing Valve
TypeAutomatic Closing Marine Valve
StandardJIS F Series
FunctionShut-off and Safety Control
MediumFuel Oil, Lubricating Oil, Water, Air
Size RangeDN15-DN100
Pressure RatingJIS 5K / 10K / 16K
Connection TypeFlanged / Threaded
OperationManual Opening + Automatic Closing
Closing MechanismSpring Loaded / Weight Type
Body MaterialBronze / Cast Steel / Stainless Steel
ApplicationShip Piping Systems

Pressure Test of JIS Marine Self-closing Valve

Test ItemDescription
Shell Hydrostatic TestVerifies valve body pressure strength
Seat Leakage TestChecks sealing performance
Self-closing Function TestConfirms automatic closing operation
Opening & Closing TestEnsures smooth operation
Material InspectionConfirms material compliance
Appearance InspectionChecks surface quality

Advantages of JIS Marine Self-closing Valve

FeatureBenefit
JIS Standard DesignSuitable for Japanese and Asian shipbuilding projects
Automatic Closing FunctionPrevents accidental leakage
Compact StructureSaves installation space
Marine Material OptionsSuitable for harsh marine conditions
Reliable SealingImproves system safety

Typical Applications

ApplicationFunction
Fuel Oil Tank OutletPrevents fuel leakage
Lubricating Oil SystemControls oil discharge
Sounding Pipe SystemAllows temporary opening measurement
Drain PipelineControls liquid drainage
Engine Room SystemProvides safety shut-off
Marine Auxiliary SystemControls fluid flow


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