GB/T593 Marine Plug Valve
Key Features and Design
• Quick Operation: A plug valve is a rapid-action straight-through valve
A simple quarter-turn (90-degree) rotation of the plug fully opens or closes the valve.
• Self-Cleaning: The sliding motion between the plug and its sealing surface has a wiping action, making it suitable for media containing suspended particles-
• Multiple Flow Paths: The design easily adapts to multi-port configurations. A single valve can have two, three, or even four different flow paths (e.g., two-way, three-way), which helps simplify piping system design and reduce the number of fittings required-
• Packed Design: These are packed cocks, meaning they use a packing material (like gland packing) around the stem to prevent leakage.
Overview
Technical Specifications
• Scope of Application: This standard applies to the design, manufacture, and acceptance of cocks used in marine piping systems for media including seawater, fresh water, lubrication oil, and fuel oil
• Standard Versions: The standard has evolved over time. The current version is GB/T 593-2019(effective from 2020-03-01), which replaced the older GB/T 593-1993 version
• Common Materials: The valves are typically manufactured from bronze or cast iron
• Connection Types: The standard covers valves with different connection types, including flanged connections and external threaded connections
• Pressure and Size (Example from GB/T593-93):
1. Nominal Pressure: Typically 0.6 MPa
2. Nominal Diameter (DN): Ranges from DN 20 to DN 80 for flanged types and DN 6 to DN 32 for threaded types
Main Components of GB/T593 Marine Plug Valve
| Component | Function |
|---|---|
| Valve Body | Main pressure-containing component |
| Plug | Controls fluid passage |
| Valve Stem | Transfers operating force |
| Valve Cover | Protects internal structure |
| Seat | Ensures sealing performance |
| Packing | Prevents leakage |
| Handle / Gear Operator | Provides operation |
| Flange Connection | Connects marine pipelines |
Applicable Standards of GB/T593 Marine Plug Valve
| Standard Category | Standard |
|---|---|
| Marine Plug Valve Standard | GB/T593 |
| Shipbuilding Valve Standards | CB/T Series |
| Marine Equipment Standards | GB/T Marine Standards |
| Flange Connection | GB/T9119 |
| Pressure Testing | GB/T13927 |
| General Valve Requirements | GB/T12220 |
| Classification Requirements | CCS / ABS / DNV / LR |
GB/T593 Standard Information
| Item | Description |
|---|---|
| Standard | GB/T593 |
| Product Type | Marine Plug Valve |
| Application | Ship piping systems |
| Installation | Marine pipeline |
| Medium | Water, seawater, oil, air |
| Manufacturing Basis | Chinese shipbuilding requirements |
| Application Field | Marine engineering and vessels |
Material Selection of GB/T593 Marine Plug Valve
| Material | Features | Applications |
|---|---|---|
| Bronze | Excellent corrosion resistance | Seawater systems |
| Cast Iron | Economical and durable | General pipelines |
| Cast Steel | High strength | Heavy-duty systems |
| Stainless Steel | Excellent corrosion resistance | Offshore applications |
| Aluminum Bronze | Superior seawater resistance | Marine equipment |
Common Material Standards
| Material | Standard |
|---|---|
| Bronze | GB/T1176 / ASTM B62 |
| Cast Iron | GB/T9439 / ASTM A126 |
| Cast Steel | GB/T12229 / ASTM A216 WCB |
| Stainless Steel | ASTM A351 CF8M |
| Aluminum Bronze | ASTM B148 |
Technical Specifications of GB/T593 Marine Plug Valve
| Item | Specification |
|---|---|
| Product Name | GB/T593 Marine Plug Valve |
| Standard | GB/T593 |
| Valve Type | Marine Rotary Plug Valve |
| Operation | Manual / Gear Operated |
| Connection Type | Flanged |
| Medium | Seawater, Water, Oil, Air |
| Nominal Size | DN15-DN300 |
| Pressure Rating | PN6-PN16 |
| Material | Bronze / Cast Iron / Cast Steel |
| Application | Ship Piping Systems |
Applications of GB/T593 Marine Plug Valve
| System | Function |
|---|---|
| Ballast System | Controls ballast water |
| Seawater System | Controls seawater circulation |
| Bilge System | Controls drainage |
| Cooling System | Controls cooling water |
| Fuel Oil System | Controls fuel flow |
| Auxiliary System | Controls ship service pipelines |
Inspection & Testing
| Test Item | Description |
|---|---|
| Hydraulic Shell Test | Checks valve body strength |
| Sealing Test | Confirms leakage performance |
| Operation Test | Ensures smooth rotation |
| Material Inspection | Verifies material requirements |
| Dimension Inspection | Confirms standard compliance |
| Appearance Inspection | Checks surface quality |
