3-Piece Carbon Steel Ball Valve

The 3-piece carbon steel ball valve is engineered for industrial pipeline systems where maintenance accessibility, sealing reliability, and lifecycle cost efficiency are critical operational priorities.
Unlike one-piece or two-piece designs, the three-piece swing-out structure allows the central body section to be removed without disconnecting the pipeline ends. This design significantly reduces downtime during inspection, seal replacement, or internal servicing-making it highly suitable for continuous-operation industrial systems.

1. Inline Maintenance Without Pipeline Disassembly
The defining feature of the 3-piece structure is its swing-out center body design, which allows internal components to be serviced without removing end connections.
This provides several operational benefits:

• Reduced maintenance labor during seal replacement
• Shorter shutdown windows in continuous systems
• Lower lifecycle maintenance cost (TCO optimization)
• Easier inspection during scheduled plant maintenance cycles

2. Stable Sealing Performance Under Pressure Variations
The valve uses a precision-machined floating or trunnion-supported ball structure depending on size and pressure class.
Engineering characteristics include:

• Controlled seat compression for consistent sealing force
• Uniform load distribution to minimize localized wear
• Stable sealing performance under thermal expansion cycles
• Designed for repeatable shut-off performance under rated pressure conditions

3. Carbon Steel Body for Industrial Durability
The valve body is manufactured from ASTM A216 WCB / WCC carbon steel, widely used in industrial pressure equipment.
Key characteristics include:

• High mechanical strength under pressure fluctuations
• Resistance to pipeline vibration and thermal stress
• Suitable for non-corrosive and general industrial media
• External surface protected with industrial-grade anti-corrosion coating systems

Full Bore & Reduced Bore Options
Full bore design supports minimal flow resistance and pigging compatibility
Reduced bore option provides a cost-optimized solution for general industrial flow control
Blow-Out Proof Stem Design
The stem is internally retained by a mechanical shoulder structure, reducing the risk of stem ejection under abnormal pressure conditions.
Live-Loaded Packing System
Graphite or PTFE packing with adjustable compression structure helps maintain sealing stability under thermal cycling and reduces fugitive emission risk.
ISO 5211 Mounting Interface (Optional)
Standardized mounting pad enables direct installation of pneumatic or electric actuators without custom brackets, improving automation compatibility.

All valves are subject to 100% pressure testing before shipment, including:
Shell strength test
Seat leakage test (API 598 compliance)
Additional quality control measures include:

• Heat number traceability for all pressure-retaining parts
• Incoming material inspection (casting verification)
• Dimensional and machining tolerance inspection at each production stage

• For welded end connections (SW/BW), the valve should remain in the fully open position during installation to reduce heat exposure to sealing components
• Avoid using the valve body as a structural load-bearing support for pipeline alignment
• Periodic inspection of packing gland torque is recommended for high-cycle applications
• Ensure proper alignment to prevent mechanical stress on end connections during installation

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