Flanged Trunnion Ball Valve
Flanged Trunnion Ball Valve
Engineered for Stable Isolation in High-Pressure Industrial Pipeline Systems
Flanged Trunnion Ball Valves are designed for industrial pipeline systems that require reliable shut-off performance under high pressure, large diameters, and frequent operation cycles.
Compared with floating ball structures, the trunnion-mounted design mechanically supports the ball at both upper and lower positions, which helps:
- Reduce operating torque,
- Stabilize sealing performance,
- Improve long-term service behavior in demanding industrial environments.
This structure is widely applied in oil & gas transmission systems, petrochemical plants, power generation units, water treatment facilities, and large-scale industrial fluid distribution networks.
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![Soft Seated Flanged Trunnion Ball Valve]()
Soft Seated Flanged Trunnion Ball Valve
Unlike floating ball valves, the trunnion-mounted design supports the ball on both upper and lower trunnions, allowing it to remain mechanically fixed while the seats move to seal. This structureAdd to Inquiry -
![Buried Type Flanged Trunnion Ball Valve]()
Buried Type Flanged Trunnion Ball Valve
Our buried trunnion ball valves are specifically engineered for critical infrastructure, including natural gas transmission lines, crude oil pipelines, and municipal energy distribution systems.Add to Inquiry -
![Bi-directional Flanged Trunnion Ball Valve]()
Bi-directional Flanged Trunnion Ball Valve
Compared with floating ball valves, the trunnion-mounted structure supports the ball at both upper and lower trunnions, which reduces operating torque and improves sealing stability under highAdd to Inquiry -
![Reduced Bore Flanged Trunnion Ball Valve]()
Reduced Bore Flanged Trunnion Ball Valve
Engineered in strict compliance with API 6D and ASME standards, our Reduced Bore Flanged Trunnion Ball Valves offer a highly cost-effective, premium-grade solution for heavy-duty pipeline isolation.Add to Inquiry -
![Stainless Steel Flanged Trunnion Ball Valve]()
Stainless Steel Flanged Trunnion Ball Valve
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 processAdd to Inquiry -
![Carbon Steel Flanged Trunnion Ball Valve]()
Carbon Steel Flanged Trunnion Ball Valve
Unlike floating ball valves, the trunnion-mounted design supports the ball on both upper and lower bearings, significantly reducing operating torque while ensuring stable, bi-directional sealingAdd to Inquiry
Why Trunnion-Mounted Design Matters for Industrial Procurement
For distributors, EPC contractors, and industrial end-users, valve selection is often influenced by operating stability, automation compatibility, and lifecycle cost rather than only initial price.
Lower Operating Torque in Large-Diameter Valves
The trunnion structure supports the ball through upper and lower stems, which means:
- Line pressure is not fully transferred to the valve seats
- Operating torque remains more stable in larger sizes
Engineering benefit:
- Allows more predictable actuator sizing
- Supports pneumatic and electric automation with lower torque requirements
- Reduces oversizing of actuator systems in large pipeline projects
Stable Sealing Performance Under Pressure Variation
Unlike floating ball valves where the ball shifts under pressure, trunnion-mounted valves maintain a fixed position.
Key design features:
- Spring-loaded or pressure-assisted seats maintain consistent contact with the ball
- Sealing performance remains stable under low and high differential pressure conditions
Result:
- Reduced risk of seat deformation in cyclic pressure applications
- More consistent sealing behavior in long-distance pipeline systems
Extended Service Life in Cyclic Operation
Because the ball is mechanically supported:
- Seat wear is significantly reduced
- Friction is more controlled during frequent operation cycles
- Maintenance intervals are typically extended in continuous-duty applications
Flanged End Connection for Industrial Integration
Flanged connections remain one of the most widely used standards in global industrial piping systems due to their installation efficiency and maintenance flexibility.
Engineering & Compliance Features
Designed in accordance with commonly used standards such as ASME B16.5 and EN 1092-1
Suitable for high-pressure bolted pipeline systems
Compatible with global EPC project specifications
Practical Advantages for Contractors
Faster installation compared to welded-end systems
Easier inline maintenance and replacement
Reduced alignment errors during field installation
For bulk procurement projects
Flanged design helps reduce installation labor time and supports modular skid-mounted system integration.
Technical Parameters
|
Parameter |
Range / Standard |
|
Size Range |
DN50–DN1200 (2"–48") |
|
Pressure Rating |
Class 150 / 300 / 600 / 900 / 1500 |
|
Temperature Range |
-29°C to +200°C (soft seated) / up to +425°C (metal seated) |
|
Leakage Standard |
API 598 / ISO 5208 / API 6D |
|
Fire-Safe Design |
API 607 / API 6FA (optional compliance) |
Materials & Engineering Options
To meet different industrial media conditions, multiple configurations are available:
Body Materials
Carbon Steel: WCB, LCB / LCC (low temperature service)
Stainless Steel: CF8, CF8M
Duplex Stainless Steel: 4A / 5A (corrosive environments)
Ball & Stem
Precision CNC-machined solid stainless steel ball
Anti-blowout proof stem design
NACE MR0175 compliant materials available for sour gas service
Seat Materials
PTFE / RPTFE (standard industrial service)
PEEK / Devlon (high temperature or wear resistance)
Metal-to-metal seating with Stellite or TCC coating for abrasive or high-temperature service
Each valve is manufactured under controlled production procedures to ensure batch-to-batch consistency for industrial procurement projects.
Standard Testing Procedures
- Shell Hydrostatic Pressure Test
- Seat Leakage Test (API 598 compliant)
- Torque Performance Test for actuator matching
- Dimensional inspection (flange alignment & face-to-face accuracy)
Traceability & Documentation
- Material Test Certificate (EN 10204 3.1 standard) provided for each order
- Heat number traceability for all pressure-bearing components
- Optional third-party inspection available (SGS / BV / TÜV)
Stable Batch Production
Controlled machining processes ensure dimensional consistency across large production volumes, supporting distributor inventory planning.
Lower Total System Cost
Reduced operating torque allows selection of smaller actuators, lowering overall automation cost in large-scale projects.
Reduced Maintenance Downtime
Extended seat life contributes to fewer shutdowns in continuous industrial operation systems.
Export-Ready Documentation
Each shipment includes full technical documentation:
- MTC reports
- Pressure test reports
- Packing lists
- Inspection certificates (if required)
Packaging & Export Protection
To ensure safe international transportation:
- Flange sealing protection caps installed on all ends
- Moisture-resistant wrapping for long-distance sea freight
- Fumigation-free plywood export cases
- Clear labeling: size, pressure class, heat number, material grade
- Optional palletized packaging for distributor warehouse handling
FAQ
As one of the leading flanged trunnion ball valve manufacturers and suppliers in China, we warmly welcome you to wholesale high-grade flanged trunnion ball valve for sale here from our factory. All our products are with high quality and competitive price.
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