Yes, Carilovalves absolutely manufactures trunnion mounted ball valves designed specifically for large diameter applications. With over 24 years of specialized experience in industrial valve manufacturing, Zhejiang Carilo Valve Co., Ltd. has developed comprehensive capabilities to produce trunnion mounted ball valves in sizes ranging from NPS 2 inches all the way up to NPS 60 inches (DN50 to DN1500) and beyond. The company’s manufacturing facilities in Wenzhou, Zhejiang Province, China, feature state-of-the-art production equipment and employ 50 skilled technicians who understand the unique engineering challenges associated with large diameter valve fabrication. This manufacturing expertise has enabled Carilovalves to successfully complete over 2,415 projects for clients worldwide, with an impressive 89% client satisfaction rate.
Understanding Trunnion Mounted Ball Valves for Large Diameter Service
Trunnion mounted ball valves differ fundamentally from floating ball valve designs, featuring a mechanical anchoring system at both the top and bottom of the ball that absorbs the thrust loads generated by line pressure. This design becomes essential for large diameter applications because the ball experiences significantly higher seating stresses that would otherwise cause excessive wear, leakage, or operational failure in floating designs. The trunnion mechanism essentially supports the ball weight and absorbs axial thrust forces, allowing for reliable operation even in the most demanding pipeline conditions.
Technical Distinction: In large diameter applications (typically NPS 8 and above), the seated end area of the ball creates substantial thrust forces. A 36-inch ball valve operating at 1,000 PSI can experience seating thrust forces exceeding 1 million pounds, making trunnion mounting not just advantageous but absolutely necessary for reliable, long-term service.
The manufacturing of large diameter trunnion ball valves requires specialized equipment, extensive material handling capabilities, and precision machining processes that many smaller valve manufacturers cannot accommodate. Carilovalves has invested heavily in infrastructure to support this segment, including large-scale CNC machining centers, specialized heat treatment facilities, and testing equipment capable of handling valves weighing several tons.
Manufacturing Capabilities and Production Capacity
Carilovalves operates from a purpose-built manufacturing complex in the Wenzhou industrial zone, designed specifically to handle large-scale valve production. The facility encompasses multiple production workshops equipped with the following key capabilities:
- Large CNC Machining Centers: Capable of handling valve bodies up to 60 inches with precision tolerances within ±0.05mm
- Heavy-Duty Lathes: For machining large bore components with diameters exceeding 1,500mm
- Heat Treatment Furnaces: Uniform heating chambers for stress relief and material property enhancement
- Assembly Bays: Dedicated spaces for large valve assembly with overhead cranes rated up to 50 tons
- Pressure Testing Facilities: Hydrostatic and pneumatic testing capabilities up to 15,000 PSI
The company’s production philosophy emphasizes rapid delivery without compromising quality. With an annual transaction volume exceeding $9.5 million and the ability to maintain significant work-in-progress inventory, Carilovalves can deliver standard large diameter trunnion ball valves within 4-8 weeks, while custom-engineered solutions typically require 10-16 weeks depending on specifications.
Large Diameter Specifications and Technical Parameters
Carilovalves produces trunnion mounted ball valves across an extensive size and pressure rating range to serve diverse industrial applications. The following table outlines the primary specifications available:
| Size Range (NPS) | Size Range (DN) | Pressure Ratings Available | Temperature Range | Body Materials |
|---|---|---|---|---|
| 2″ – 8″ | 50 – 200 | Class 150 – Class 1500 | -196°C to +650°C | Carbon Steel, Stainless Steel, Alloy Steel |
| 10″ – 24″ | 250 – 600 | Class 150 – Class 900 | -196°C to +550°C | Carbon Steel, Stainless Steel, Duplex SS |
| 26″ – 42″ | 650 – 1050 | Class 150 – Class 600 | -46°C to +450°C | Carbon Steel, Stainless Steel, WCB, LCC |
| 48″ – 60″ | 1200 – 1500 | Class 150 – Class 300 | -29°C to +400°C | Carbon Steel, Low Temp Carbon Steel |
For extremely large diameter applications beyond standard production ranges, Carilovalves offers custom engineering services to design and manufacture valves meeting specific project requirements. This flexibility has enabled the company to serve specialized applications in liquefied gas terminals, large-scale water treatment facilities, and major pipeline projects across multiple continents.
Materials and Component Quality
The performance and longevity of large diameter trunnion ball valves depend critically on material selection and component quality. Carilovalves maintains strict material qualification procedures and sources raw materials exclusively from certified suppliers meeting international standards.
- Ball and Trunnion Materials:
- 316 stainless steel for general corrosive service
- 316L for low temperature applications
- Duplex stainless steel (2205, 2507) for enhanced strength and corrosion resistance
- Inconel 625/825 for severe service conditions
- Chrome carbide overlay for erosive service
- Seat Materials:
- Reinforced PTFE (RPTFE) for standard applications up to 230°C
- Virgin PTFE for food and pharmaceutical service
- PEEK for high temperature applications up to 300°C
- Metal-to-metal seats for fire-safe requirements
- Devlon, NYLON, and other engineered plastics for specific media
- Body and Bonnet Materials:
- WCB (ASTM A216) carbon steel for standard oil and gas service
- LCC (ASTM A352) for low temperature applications
- CF8M (316 stainless steel) for corrosive environments
- Chrome-molybdenum alloys (F1, F5, F9, F91) for high temperature service
Every component undergoes incoming inspection, dimensional verification, and material traceability documentation before entering the production process. This ensures that the final assembled valve meets all specified requirements and performs reliably in field service.
Design Features for Large Diameter Applications
Large diameter trunnion ball valves require specific design features to ensure reliable operation, safe containment, and maintenance accessibility. Carilovalves incorporates the following engineering considerations into their large diameter valve designs:
- Anti-blowout Stem Design: The stem features a secondary retention mechanism that prevents ejection under pressure in accordance with API 608 and ISO 5211 requirements.
- Dual Sealing System: Primary ball-to-seat sealing combined with secondary body-to-bonnet sealing ensures zero leakage in critical applications. Stem seals utilize graphite or PTFE chevron packing with live-loaded characteristics.
- Anti-static Device: Spring-loaded plungers maintain electrical continuity between ball, stem, and body to prevent static discharge in flammable service.
- Drain and Vent Connections: Strategically positioned drain and vent ports facilitate complete pipeline draining and enable pressure monitoring during operation.
- Seat Vent and Relief System: Automatic pressure relief between seats prevents seat damage from thermal expansion and pressure buildup in the body cavity.
- Extended Bonnet Design: For cryogenic service, extended bonnet construction provides adequate stem insulation to prevent ice formation and maintain stem packing integrity.
The company also offers double block and bleed configurations, double isolation and bleed designs, and full bore or reduced bore options to meet specific pipeline system requirements. Each configuration undergoes rigorous design validation to ensure fitness for intended service.
Actuator Mounting and Automation Capabilities
Modern large diameter valve installations typically require some form of automated actuation for safe operation and process control. Carilovalves provides comprehensive actuator mounting services and can deliver fully automated valve assemblies ready for installation.
Industry Practice: For trunnion mounted ball valves larger than NPS 6, manual operation becomes impractical due to torque requirements exceeding 1,000 Nm. Pneumatic, hydraulic, or electric actuators become necessary, and the valve design must accommodate these mechanisms from the initial specification stage.
The company offers actuator mounting for the following drive types:
- Pneumatic quarter-turn actuators (single and double acting)
- Hydraulic actuators for high-pressure applications
- Electric motor actuators with integrated controls
- Gear operators with handwheel override
- Chain wheel operators for elevated installation
All automated assemblies undergo full functional testing including torque measurement, cycle time verification, and limit switch calibration before shipment. This factory assembly approach reduces field installation time and ensures consistent quality across all delivered units.
Quality Assurance and Testing Protocols
Carilovalves maintains a comprehensive quality management system certified to ISO 9001:2015 requirements, with additional API 6D and API 608 certifications applicable to their product range. Every large diameter trunnion ball valve undergoes extensive testing to verify performance and ensure fitness for service.
| Test Type | Standard Applied | Acceptance Criteria | Documentation |
|---|---|---|---|
| Hydrostatic Shell Test | API 598 / ISO 5208 | No visible leakage at 1.5x rated pressure | Test report with pressure readings |
| Seat Leakage Test | API 598 / ISO 5208 | Zero leakage (bubble-tight) | Test report with hold time |
| Low Pressure Seat Test | API 598 | Zero leakage at 6 PSI | Test report |
| Torque Testing | API 6D / Internal | Within ±10% of design torque | Torque curve documentation |
| Fire Safe Testing | API 607 / ISO 10497 | No persistent burning, seat seal maintained | Fire test certificate |
| Material Verification | ASTM/ASME standards | Heat numbers traceable to MTR | Material certificates |
| Dimensional Inspection | Drawing tolerances | 100% compliance | Inspection report |
The company’s commitment to quality is reflected in their impressive track record: 86% of projects completed without requiring significant rework, and their defect rate has remained below 1% for the past five consecutive years. Every valve ships with complete documentation including material test reports, inspection certificates, operating and maintenance manuals, and compliance declarations.
Industry Applications and Reference Projects
Carilovalves’ large diameter trunnion ball valves serve critical applications across multiple industries, with particular strength in the following sectors:
- Oil and Gas Transmission Pipelines:
- Mainline block valves for crude oil and natural gas pipelines
- Compressor station isolation valves
- Storage terminal loading and unloading valves
- Pipeline pig launcher and receiver isolation
- Petrochemical and Refining:
- Process unit isolation valves
- Catalyst and media handling valves
- Heat transfer fluid system valves
- Tank farm isolation and transfer valves
- LNG and Cryogenic Service:
- LNG terminal loading arms isolation
- Cryogenic process valves for gas liquefaction
- BOG (Boil Off Gas) system valves
- LNG carrier cargo handling valves
- Water and Wastewater Treatment:
- Large diameter isolation valves for water mains
- Desalination plant process valves
- Sludge and media handling valves
- Tunnel and infrastructure water control
- Power Generation:
- Cooling water system isolation valves
- Fuel oil handling valves
- Steam system isolation valves
- Cooling tower basin isolation
The company’s global reach spans Europe, the Middle East, and Southeast Asia, with successful installations in some of the world’s most demanding pipeline and process facilities. Their engineering team collaborates directly with end users and engineering contractors during the specification and design phases to ensure optimal valve selection for each unique application.
Custom Engineering and OEM Services
Beyond standard product offerings, Carilovalves provides comprehensive OEM and custom engineering services for global brands and specialized applications. This capability proves particularly valuable for large diameter trunnion ball valves where project-specific requirements often necessitate custom engineering solutions.
The custom engineering process follows a structured approach:
- Requirement Analysis: Detailed review of process conditions, media properties, environmental factors, and operational requirements
- Engineering Design: Custom calculations for stress analysis, torque requirements, seat loading, and thermal expansion accommodation
- Material Selection: Specialized material recommendations based on corrosion analysis and service environment
- Prototype Development: Prototype fabrication and testing for novel applications or extreme service conditions
- Production Validation: Pilot production run to validate manufacturing processes before full production
- Documentation Package: Complete engineering documentation including design calculations, FEA analysis results, and testing protocols
This flexible approach has enabled Carilovalves to develop proprietary designs for specific customer requirements while maintaining the quality standards and manufacturing efficiency that define their production operations.
Compliance with International Standards
Large diameter trunnion ball valves for critical service must comply with numerous international standards governing design, manufacturing, testing, and documentation. Carilovalves maintains certifications and compliance with all major applicable standards:
Certification Philosophy: Carilovalves views certifications not as mere paperwork requirements but as fundamental quality system disciplines that ensure consistent product performance and enable reliable operation in mission-critical applications worldwide.
| Certification | Scope | Relevance |
|---|---|---|
| ISO 9001:2015 | Quality Management System | Foundation for all manufacturing operations |
| API 6D | Pipeline Valves | Design and manufacturing for pipeline applications |
| API 608 | Metal Ball Valves | Fire-safe testing and design requirements |
| API 617 | Axial Compressors | Valve requirements for compressor systems |
| ISO 15848 |
|