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GB/T593 Marine Plug Valve

GB/T593 Marine Plug Valve

GB/T593 Marine Plug Valve is a marine rotary plug valve manufactured according to the Chinese national standard GB/T593 for shipbuilding applications.

The valve adopts a plug-type rotating structure and is designed for reliable shut-off and flow control in marine piping systems.

According to GB/T593 requirements, the valve is commonly used on ships for controlling seawater, fresh water, oil, and other marine pipeline media.

GB/T593 Marine Plug Valve is widely applied in:

  • Ship seawater systems

  • Ballast systems

  • Bilge systems

  • Cooling water systems

  • Fuel oil systems

  • Marine auxiliary pipelines

The valve is mainly supplied for:

  • Commercial vessels

  • Naval auxiliary vessels

  • Shipyards

  • Marine equipment replacement projects

Overview

Working Principle of GB/T593 Marine Plug Valve

GB/T593 Marine Plug Valve controls fluid flow through the rotation of a plug inside the valve body.

When the plug rotates 90 degrees:

  • The flow passage aligns with the pipeline → valve opens

  • The flow passage blocks the pipeline → valve closes

StepDescription
1Operator rotates handle or operating mechanism
2Stem transfers torque to plug
3Plug rotates inside valve body
4Flow passage opens or closes
5Valve completes isolation function

Main Components of GB/T593 Marine Plug Valve

ComponentFunction
Valve BodyMain pressure-containing component
PlugControls fluid passage
Valve StemTransfers operating force
Valve CoverProtects internal structure
SeatEnsures sealing performance
PackingPrevents leakage
Handle / Gear OperatorProvides operation
Flange ConnectionConnects marine pipelines

Applicable Standards of GB/T593 Marine Plug Valve

Standard CategoryStandard
Marine Plug Valve StandardGB/T593
Shipbuilding Valve StandardsCB/T Series
Marine Equipment StandardsGB/T Marine Standards
Flange ConnectionGB/T9119
Pressure TestingGB/T13927
General Valve RequirementsGB/T12220
Classification RequirementsCCS / ABS / DNV / LR

GB/T593 Standard Information

ItemDescription
StandardGB/T593
Product TypeMarine Plug Valve
ApplicationShip piping systems
InstallationMarine pipeline
MediumWater, seawater, oil, air
Manufacturing BasisChinese shipbuilding requirements
Application FieldMarine engineering and vessels

Material Selection of GB/T593 Marine Plug Valve

MaterialFeaturesApplications
BronzeExcellent corrosion resistanceSeawater systems
Cast IronEconomical and durableGeneral pipelines
Cast SteelHigh strengthHeavy-duty systems
Stainless SteelExcellent corrosion resistanceOffshore applications
Aluminum BronzeSuperior seawater resistanceMarine equipment

Common Material Standards

MaterialStandard
BronzeGB/T1176 / ASTM B62
Cast IronGB/T9439 / ASTM A126
Cast SteelGB/T12229 / ASTM A216 WCB
Stainless SteelASTM A351 CF8M
Aluminum BronzeASTM B148

Technical Specifications of GB/T593 Marine Plug Valve

ItemSpecification
Product NameGB/T593 Marine Plug Valve
StandardGB/T593
Valve TypeMarine Rotary Plug Valve
OperationManual / Gear Operated
Connection TypeFlanged
MediumSeawater, Water, Oil, Air
Nominal SizeDN15-DN300
Pressure RatingPN6-PN16
MaterialBronze / Cast Iron / Cast Steel
ApplicationShip Piping Systems

Applications of GB/T593 Marine Plug Valve

SystemFunction
Ballast SystemControls ballast water
Seawater SystemControls seawater circulation
Bilge SystemControls drainage
Cooling SystemControls cooling water
Fuel Oil SystemControls fuel flow
Auxiliary SystemControls ship service pipelines

Inspection & Testing

Test ItemDescription
Hydraulic Shell TestChecks valve body strength
Sealing TestConfirms leakage performance
Operation TestEnsures smooth rotation
Material InspectionVerifies material requirements
Dimension InspectionConfirms standard compliance
Appearance InspectionChecks surface quality


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