Products
Stainless Steel Flanged Trunnion Ball Valve
Product Overview
The stainless steel flanged trunnion ball valve is engineered for high-pressure, large-diameter, and critical pipeline isolation applications in oil, gas, petrochemical, and industrial process systems.
Unlike floating ball valves, the trunnion-mounted structure mechanically supports the ball at both upper and lower trunnions, ensuring:
- Lower operating torque under high differential pressure
- Reduced seat wear and longer service life
- Stable sealing performance independent of line pressure fluctuation
- Improved suitability for automated actuation systems
Design Standards & Compliance
Design Standard: API 6D / ASME B16.34 / ISO 14313
Pressure & Temperature: ASME Class 150 – 2500 (PN16 – PN420)
Face-to-Face: API 6D / ASME B16.10
Flange Ends: ASME B16.5 / EN 1092-1
Testing: API 598 / EN 12266-1
Fire Safe Design: API 607 / API 6FA (available upon request)
Manufacturing and inspection processes are supported by:
ISO 9001 Quality Management System
100% Pressure Testing Before Shipment
PMI (Positive Material Identification) for all wetted parts
Full traceability per EN 10204 3.1 Material Certification
Technical Specifications
|
Parameter |
Specification |
|
Size Range |
2" – 24" (DN50 – DN600) |
|
Pressure Class |
ASME Class 150 – 2500 |
|
Body Materials |
ASTM A351 CF8 / CF8M / CF3M |
|
Ball & Stem |
SS 316 / Hardened SS (optional) |
|
Seat Type |
PTFE / RPTFE / Metal-seated (optional) |
|
Operation |
Lever / Gear / Electric / Pneumatic |
|
Mounting |
ISO 5211 Actuator Pad Standard |
|
Bore Type |
Full Bore (pipeline piggable design) |
Engineering Advantages
Reduced Operating Torque & Lower Actuator Cost
The trunnion-supported structure isolates ball load from seats, significantly reducing frictional resistance.
Engineering result:
- Lower breakaway torque under high pressure
- Reduced actuator sizing requirement
- Lower automation system cost (electric/pneumatic)
Stable Sealing Under High Differential Pressure
Unlike floating ball valves, sealing force is not dependent on line pressure.
Spring-loaded or pressure-assisted seat design
Consistent sealing performance under pressure fluctuations
Suitable for compressor stations and long-distance transmission pipelines
Corrosion Resistance & Material Traceability
All wetted parts are manufactured from ASTM A351 stainless steel (CF8 / CF8M / CF3M).
Quality control includes:
- PMI verification for every heat number
- Chemical composition traceability
- Controlled casting + CNC precision machining
Full Bore Design for Pipeline Efficiency
Internal diameter matches pipeline ID
Enables pigging operations
Minimizes pressure drop
Improves flow efficiency in long-distance pipelines
Flanged Connection for Industrial Reliability
Flanged end design ensures:
- Easy alignment during installation
- Reduced welding requirement
- Faster maintenance and replacement
- Higher sealing reliability under pressure cycling
Fire Safety & Operational Security
Optional fire-safe configuration is designed in accordance with API 607 / API 6FA requirements:
- Secondary metal-to-metal sealing under fire conditions
- Anti-blowout stem design
- Graphite-based fire-safe sealing system
Automation Compatibility
The valve is designed for modern industrial automation systems:
- ISO 5211 direct mounting pad
- Compatible with pneumatic, electric, and hydraulic actuators
- Standardized interface eliminates custom bracket requirements
- Suitable for SCADA and remote control systems
Applications
This valve is widely used in:
- Oil & gas transmission pipelines
- LNG receiving and storage terminals
- Refining and petrochemical plants
- Compressor and metering stations
- Power generation auxiliary systems
- Chemical process pipelines
- Industrial water and seawater systems
Quality Control & Inspection System
Each valve undergoes strict inspection before delivery:
Mechanical & Pressure Testing
- Shell test (hydrostatic)
- Seat leakage test (low & high pressure)
- Air pressure test for sealing integrity
- Torque verification for actuator compatibility
Dimensional & Material Inspection
- CNC dimensional inspection report
- Flange alignment verification
- PMI material verification
- Heat number traceability check
Documentation Package
For EPC approval and customs clearance:
- EN 10204 3.1 Material Test Certificate (MTC)
- API 598 Pressure Test Report
- PMI Inspection Report
- Dimensional Inspection Report
- Certificate of Compliance (ISO / API / CE where applicable)
Engineering Problems Solved for Buyers
- High actuator cost in automation systems → reduced torque requirement
- Frequent leakage under pressure cycling → stable trunnion sealing system
- Long maintenance downtime → flanged maintenance-friendly structure
- Corrosion-related failure → stainless steel + PMI verification
- Non-standard product variation → strict API-based manufacturing control
FAQ
Q: What is the main engineering advantage of a trunnion ball valve?
A: The trunnion structure mechanically supports the ball, reducing seat load and operating torque, which improves performance in high-pressure and large-diameter pipelines.
Q: Is this valve suitable for automated systems?
A: Yes. It is equipped with ISO 5211 mounting pad for direct actuator installation without additional brackets.
Q: What materials are available?
A: Standard materials include CF8, CF8M, and CF3M stainless steel, with optional upgraded alloys for corrosive or low-temperature environments.
Q: What certifications are available?
A: API 6D design compliance, ISO 9001 system certification, and optional API 607 fire-safe certification depending on configuration.
Q: What is the production lead time?
A: Standard configurations: 4–6 weeks Project/custom orders: based on specification and order volume
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