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Help CenterAPI 6D Duplex Stainless Steel Ball Valve With Extended Bonnet for High Temperature Applications
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As a leading manufacturer with a strong commitment to quality and innovation since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our premium API 6D Duplex Stainless Steel Ball Valve with Extended Bonnet. Engineered specifically for demanding high-temperature applications, this valve represents the culmination of advanced metallurgy and precision engineering. We understand the critical need for reliability in harsh process environments, which is why we design and manufacture this valve to deliver exceptional performance, extended service life, and superior safety. Our valves are trusted by clients across diverse global markets, from North America and Europe to Southeast Asia and Africa, ensuring fluid control solutions that meet the highest industry standards.
This specialized ball valve is constructed to handle the unique challenges posed by elevated temperatures and corrosive media. The extended bonnet design is a key feature, providing critical thermal isolation between the valve body and the operating mechanism.
- Superior Material Integrity: Fabricated from Duplex Stainless Steel (UNS S31803/S32205), this valve offers an outstanding combination of high strength and excellent corrosion resistance. The duplex microstructure provides approximately twice the yield strength of standard austenitic stainless steels like 316, making it ideal for high-pressure, high-temperature services.
- Thermal Management with Extended Bonnet: The extended bonnet is engineered to protect stem packing, seals, and actuation components from extreme process heat. This design prevents packing degradation, ensures smooth operation, and enhances personnel safety by maintaining lower external temperatures on the handwheel or actuator.
- API 6D Compliance for Pipeline Service: Manufactured in full compliance with API Specification 6D for pipeline valves, ensuring robust design, rigorous testing, and reliable performance in critical oil, gas, petrochemical, and power generation applications.
- Versatile Seating Options: Available with soft seats (PTFE, reinforced PTFE) for tight shut-off or metal-seated designs for abrasive or high-temperature services beyond the limits of polymers.
- Robust Actuation Compatibility: The valve is designed for easy integration with manual gear operators, as well as pneumatic and electric actuators, allowing for seamless automation within your control system.
Here are some key technical specifications for our standard offering:
| Parameter | Specification / Range |
| Design & Manufacturing Standard | API 6D, ASME B16.34 |
| Pressure-Temperature Ratings | ASME B16.34 |
| Face-to-Face Dimensions | API 6D, ASME B16.10 |
| End Connection Standards | Flanged: ASME B16.5, B16.47; Butt Weld: ASME B16.25 |
| Fire Safe Design | API 607 / API 6FA (optional) |
| Leakage Class | Seat: API 598 / ANSI FCI 70-2 Class VI (soft seat), Class IV (metal seat) Stem: API 622 / ISO 15848-1 (optional) |
The primary advantage for our clients is reduced total cost of ownership. The duplex steel's corrosion resistance minimizes maintenance and replacement frequency, while the extended bonnet design drastically extends the life of sealing components. This translates to fewer unplanned shutdowns, lower maintenance costs, and enhanced process safety and reliability. Whether for offshore platforms, LNG terminals, chemical processing plants, or high-temperature water systems, this valve provides a dependable long-term solution.
Shanghai Zhibang's manufacturing excellence is backed by our ISO9001 certification, ensuring consistent quality control from raw material sourcing to final inspection and testing. With an annual export value demonstrating our global reach and client trust, we are equipped to serve your project needs efficiently. Our strategic location allows for flexible shipment from major ports including Shanghai, Guangzhou, and Hong Kong. We invite you to experience the reliability and performance of our API 6D Duplex Stainless Steel Ball Valves. Contact our engineering team today to discuss your specific application requirements, request detailed technical data sheets, or obtain a competitive quotation. Let us provide you with a valve solution engineered for durability and peak performance in your most challenging high-temperature applications.
Frequently Asked Questions (FAQ)
Q1: What is the maximum continuous operating temperature for this valve?
A1: The maximum temperature depends on the seat material. With standard PTFE seats, the valve is suitable for services up to approximately 200°C (392°F). For higher temperatures, we offer reinforced PTFE or full metal-seated versions, which can handle temperatures exceeding 400°C (752°F) in certain configurations. The extended bonnet design is crucial for protecting components at these elevated temperatures.
Q2: Can this valve be used in cryogenic services?
A2: While Duplex Stainless Steel has good low-temperature toughness, the standard extended bonnet design is optimized for high-temperature isolation. For cryogenic applications, we recommend our specially designed extended bonnet valves for low-temperature service, which feature different stem packing and material treatments to prevent issues like packing freeze.
Q3: What are the main differences between API 6D and other standards like API 608?
A3: API 6D is specifically for pipeline valves (gate, plug, ball, and check valves), focusing on requirements for the pipeline industry, including full-port design, fire testing, and pressure testing protocols. API 608 covers metal ball valves for general refinery and process service. Our valve is designed and manufactured to the more stringent API 6D specification, making it suitable for critical pipeline duties.
Q4: Is the extended bonnet length customizable?
A4: Yes, we offer customizable bonnet extension lengths based on your specific process temperature. The standard extension is designed for a defined temperature gradient. For exceptionally high temperatures, a longer extension can be engineered to ensure optimal thermal protection for the actuator and stem seals.
Q5: What types of actuators can be fitted?
A5: The valve is designed for easy integration with a wide range of actuators. We can supply or interface with:
- Manual gear operators (with or without locking device)
- Pneumatic actuators (double-acting or spring-return)
- Electric motor actuators
- Hydraulic actuators (available upon request)
Our technical team can help you select the appropriate actuator based on your automation and fail-safe requirements.
Q6: Do you offer special trim or coatings for erosive or corrosive services?
A6: Absolutely. For services with erosive particles or highly corrosive media beyond the standard duplex steel's capability, we offer options such as:
- Hardened trim components (stellited seats and ball)
- Special alloy overlays (e.g., Inconel, Hastelloy)
- Internal coatings like PTFE or ceramic
Please provide your specific service conditions for a tailored recommendation.
Q7: What documentation and testing are provided with the valve?
A7: Each valve undergoes rigorous testing. Standard documentation includes a Material Test Report (MTR), Factory Test Report per API 598 (covering shell test, seat test, and low-pressure tests), and a certificate of compliance. Additional testing like NDE (UT, RT, PT), PMI, or full traceability is available upon request.
Q8: What is your typical lead time for these valves?
A8: Lead time depends on the size, pressure class, and customization required. For standard specifications in common sizes, we often have stock or can deliver within 8-12 weeks. For large diameters, high pressure classes, or special materials, the lead time may be longer. We provide a firm delivery schedule with every quotation.
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