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Help CenterAPI 6D Trunnion Mounted Ball Valve With DN50-DN600 Sizes and Class150-Class600 Pressure Rating
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As a leading manufacturer with ISO 9001 certified quality management, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering robust and reliable flow control solutions for demanding industrial applications. Our API 6D Trunnion Mounted Ball Valve series, available in sizes from DN50 to DN600 and pressure classes from 150 to 600, is engineered for superior performance in high-pressure and critical service pipelines. We combine precision manufacturing with stringent testing to ensure every valve meets the rigorous standards expected in the global oil, gas, and petrochemical sectors, providing our clients with durability, safety, and long-term operational cost savings.
This valve is designed for optimal sealing and operational stability under extreme conditions. The trunnion-mounted ball design is a key feature, where the ball is supported by stem and bottom trunnions. This configuration significantly reduces operating torque and minimizes seat wear, especially in high-pressure and large-diameter applications, ensuring a longer service life and reliable shut-off.
- Robust Construction & Materials: The valve body is typically constructed from forged or cast materials like carbon steel (A216 WCB), stainless steel (A351 CF8/CF8M), or alloy steel to withstand high pressures and corrosive media. Critical internal components, including seats and seals, are available in advanced polymers like PTFE, RPTFE, or PEEK, as well as metal for fire-safe or high-temperature applications.
- Advanced Sealing System: Features a dual-piston effect seat design. Under pressure, the upstream seat is pushed against the ball, creating a tight seal. The downstream seat is also energized, providing a reliable secondary seal and bidirectional blocking capability. Spring-loaded seats ensure continuous sealing even as the seat material wears over time.
- Low Torque Operation: The trunnion support absorbs the thrust from the line pressure, preventing the ball from shifting into the seats. This results in consistently low operating torque, making manual operation easier and allowing for smaller, more cost-effective pneumatic or electric actuators.
- Fire-Safe Design: Many models comply with API 607/6FA fire-safe standards. In case of a fire, the primary soft seals may degrade, but secondary metal-to-metal seals between the ball and seat engage to maintain a partial seal and prevent catastrophic failure.
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Versatile Actuation Options: The valve can be fitted with manual handwheels or gear operators for accessible sites. For remote or automated control, it is compatible with a range of actuators:
- Pneumatic actuators (double-acting or spring-return)
- Electric actuators (modulating or on/off)
- Hydraulic actuators for high-torque requirements
Detailed technical specifications for standard configurations are outlined below:
| Parameter | Specification |
| Design & Manufacturing Standard | API 6D, API 608, ASME B16.34 |
| Size Range (Nominal Diameter) | DN50 (2"), DN65 (2.5"), DN80 (3"), DN100 (4"), DN150 (6"), DN200 (8"), DN250 (10"), DN300 (12"), DN350 (14"), DN400 (16"), DN450 (18"), DN500 (20"), DN600 (24") |
| Pressure Class (ASME) | 150, 300, 400, 600 |
| Pressure-Temperature Rating | As per ASME B16.34 |
| End Connection Types | Raised Face (RF), Ring Type Joint (RTJ), Butt Weld (BW), Socket Weld (SW) |
| Body Material (Common) | A216 WCB (Carbon Steel), A351 CF8 (304 SS), A351 CF8M (316 SS), A352 LCB (Low Temp Carbon Steel) |
| Seat & Seal Material (Typical) | PTFE, Reinforced PTFE, PEEK, Metal (Stainless Steel, Inconel) |
| Temperature Range | -29°C to +200°C (with soft seats); Up to +550°C (with metal seats) |
| Leakage Class (Seat) | API 6D: Class VI (Soft Seat), Class IV (Metal Seat) |
| Test Standards | Shell Test, Seat Test per API 598 / API 6D |
The primary advantage for your operation is enhanced system integrity and reduced total cost of ownership. The valve's reliability minimizes unplanned downtime and maintenance interventions. Its efficient sealing reduces product loss and environmental risk. The low-torque design extends actuator life and reduces energy consumption for automated systems. For pipeline operators, this translates into improved safety, regulatory compliance, and long-term profitability.
Backed by our ISO 9001 certification and nearly a decade of manufacturing expertise since 2016, Shanghai Zhibang Valve has established a trusted supply chain, exporting over $1 million in products annually to key industrial markets across North America, Europe, Asia, and beyond. Our valves are shipped from major ports like Shanghai and Guangzhou, ensuring timely delivery. We invite you to experience the difference that a professionally engineered API 6D Trunnion Mounted Ball Valve can make. Contact our technical sales team today to discuss your specific application requirements, request a detailed quotation, or arrange for product samples.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between a trunnion-mounted and a floating ball valve?
A: In a floating ball valve, the ball is not fixed and is pushed by pressure against the downstream seat to seal. This works well for smaller sizes and lower pressures. A trunnion-mounted valve has a ball fixed on a trunnion (stem) and bottom support. It is designed for larger sizes (typically DN50 and above) and higher pressure classes (Class 150 and above), as the line pressure is absorbed by the trunnions, reducing seat load and operating torque.
Q2: Can this valve be used for both on/off and throttling service?
A: While primarily designed for reliable on/off (isolation) service, trunnion-mounted ball valves can be used for moderate throttling applications, especially when equipped with characterized seats or V-port balls. However, for precise flow control, a dedicated control valve is often recommended.
Q3: What are the available anti-static and fire-safe features?
A: Our valves can be equipped with an anti-static device (as per API 6D) to prevent sparking from static electricity. Fire-safe design per API 607/6FA is also available, featuring secondary metal seals that engage if the primary polymer seats are damaged by fire, maintaining a partial barrier.
Q4: What is the lead time for an order of DN300, Class 300 valves?
A: Lead times vary based on material specifications, actuation requirements, and order quantity. Standard carbon steel configurations typically have a shorter lead time. Please contact us with your detailed specifications for an accurate production and delivery schedule.
Q5: Do you provide valves with special coatings or internal treatments?
A: Yes. We offer various options such as internal epoxy coatings (e.g., for water service), hard-facing on seats and ball (for abrasive services), or low-temperature treatments for cryogenic applications. These are customizable based on your process media.
Q6: How do I select the appropriate seat material for my application?
A: Seat selection depends on temperature, pressure, and chemical compatibility of the media. PTFE is common for general service up to 200°C. PEEK handles higher temperatures and more aggressive chemicals. Metal seats are used for very high temperatures, fire-safe requirements, or abrasive services. Our engineering team can assist in the selection.
Q7: Are your valves suitable for sour gas service (containing H2S)?
A: Valves for sour service (NACE MR0175/ISO 15156) require specific material grades and hardness controls. We can supply valves compliant with NACE requirements upon request, using suitable materials like A350 LF2 forgings with proper heat treatment.
Q8: What documentation is provided with the valves?
A: Each valve is supplied with essential documentation, which typically includes a Material Test Report (MTR), Certificate of Conformity, hydro-test certificate, and detailed dimensional drawings. Additional certification like NDT reports can be provided as needed.
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