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Help CenterFire Safe API 6D Trunnion Mounted Ball Valve With Anti-Static Device and Double Block & Bleed Function
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As a professional valve manufacturer with a strong commitment to quality and safety, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our high-performance Fire Safe API 6D Trunnion Mounted Ball Valve. Engineered for the most demanding applications in oil & gas, petrochemical, and pipeline industries, this valve is designed to provide reliable isolation and emergency shut-off even under extreme fire conditions. Our in-house manufacturing capabilities, backed by ISO9001 certification, ensure every valve meets stringent international standards for performance and durability. We understand that operational safety is paramount, which is why our valve incorporates critical safety features like an anti-static device and a true Double Block & Bleed function, offering peace of mind for engineers and plant operators worldwide.
This valve is built to excel in critical service where failure is not an option. The trunnion-mounted design is a key differentiator, providing superior stability and reducing operating torque, especially in larger sizes and higher pressure classes. This construction minimizes seat wear and extends the valve's service life significantly compared to floating ball designs. The core of its safety proposition lies in its fire-safe design. In the event of a fire, the primary soft seals may degrade, but secondary metal-to-metal seals engage automatically, maintaining a bubble-tight seal to prevent catastrophic fluid release. This feature is rigorously tested to standards like API 607/6FA.
Key Technical Features and Advantages:
- Trunnion-Mounted Ball: The ball is supported by trunnions, which absorb the line pressure thrust. This results in lower operating torque, reduced seat load, and longer seal life, making it ideal for high-pressure and large-diameter applications.
- Double Block & Bleed (DBB) Function: This valve provides a positive seal on both upstream and downstream sides of the valve. The cavity between the seats can be safely bled or vented, allowing for safe maintenance, inspection, or gauge testing without needing to depressurize the entire line.
- Integrated Anti-Static Device: A spring-loaded mechanism ensures continuous electrical continuity between the ball, stem, and valve body. This prevents the dangerous buildup of static electricity caused by fluid flow, which is a critical safety feature for handling flammable hydrocarbons.
- Fire-Safe Construction: Utilizes a combination of primary resilient seats and secondary metal (graphite) seats. Under fire conditions, the resilient seats burn away, allowing the spring-loaded metal seats to contact the ball, creating a metal-to-metal seal that prevents leakage.
- Blow-Out Proof Stem: The stem is designed with a shoulder that prevents it from being ejected by internal pressure if the packing gland is removed, ensuring personnel safety during maintenance.
- Extended Bonnet: Optional extended or insulated bonnets are available for applications involving cryogenic or high-temperature fluids, protecting the stem packing from extreme temperatures.
Typical Technical Specifications:
| Parameter | Specification |
| Design & Manufacturing Standard | API 6D, API 608 |
| Fire Test Standard | API 607 4th Edition / API 6FA |
| Face-to-Face | ASME B16.10, API 6D |
| Flange End | ASME B16.5, ASME B16.47, EN 1092-1 |
| Pressure-Temperature Ratings | ASME B16.34 |
| Body Materials | A216 WCB, A352 LCB, A351 CF8, CF8M, A995 4A/5A/6A |
| Ball & Stem Material | Stainless Steel (A182 F316), with hard coatings available (e.g., Chrome Carbide) |
| Seat Materials | Primary: PTFE, RPTFE, Nylon, PEEK; Secondary: Graphite, Metal |
| Stem Sealing | Multiple chevron packing rings, live-loaded for automatic adjustment |
The benefits for your operation are clear. You gain a valve that delivers uncompromised safety through its certified fire-safe and anti-static features. The DBB function enhances operational efficiency by enabling safe isolation and cavity relief, reducing downtime for testing and maintenance. The robust trunnion design translates to lower lifecycle costs due to reduced maintenance needs and exceptional longevity, even in abrasive or high-cycle services. Furthermore, compliance with API 6D ensures global acceptance and simplifies procurement for major projects.
With an annual export value demonstrating our global reach and reliability, Shanghai Zhibang has established itself as a trusted partner from Shanghai to markets across North America, South America, Europe, Asia, Africa, and Oceania. Our valves ship from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. Choosing our Fire Safe API 6D Trunnion Ball Valve means investing in a product built with precision, tested for extreme conditions, and backed by a manufacturer dedicated to quality since 2016. It is more than just a valve; it is an integral component of your plant's safety and reliability strategy. Contact us today to discuss your specific requirements, request detailed datasheets, or get a competitive quotation for your next project.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a trunnion-mounted ball valve over a floating ball valve?
A1: The trunnion-mounted design supports the ball at the top and bottom, which drastically reduces the operating torque and minimizes friction on the seats. This makes it far superior for high-pressure, large-diameter, and frequent operation applications, leading to longer service life and easier actuation.
Q2: Can you explain the Double Block & Bleed (DBB) function in simple terms?
A2: Imagine the valve has two independent sealing points (one on each side of the ball). When the valve is closed, it blocks flow from both directions. The small space (cavity) between these two seals has a port that can be opened to safely drain or vent any trapped pressure. This allows you to confirm the valve is truly sealed and work on downstream equipment safely.
Q3: Why is an anti-static device necessary in a ball valve?
A3: When dry, non-conductive fluids (like hydrocarbons) flow at high velocity, they can generate static electricity. If this charge builds up on the isolated ball, it could create a spark—a major ignition hazard. The anti-static device provides a permanent conductive path to ground, safely dissipating any static charge.
Q4: What does "Fire Safe" certification actually mean for this valve?
A4: It means the valve has passed rigorous standardized tests (like API 607) where it is subjected to a direct flame for a specified period while under pressure. The test verifies that the valve maintains a seal (with allowable minimal leakage) during and after the fire, primarily through a secondary metal sealing system, preventing a small leak from becoming a major fuel source for the fire.
Q5: What actuator options are compatible with this valve?
A5: The valve is designed to be easily fitted with a variety of actuators. We can provide or recommend manual gear operators, pneumatic actuators (double-acting or spring-return), electric motor actuators, or hydraulic actuators. The choice depends on your required speed of operation, available power source, and fail-safe requirements.
Q6: For which applications is this valve particularly recommended?
A6: This valve is ideal for critical isolation points in oil & gas transmission and distribution pipelines, refinery process lines, tank farm loading/unloading terminals, hydrocarbon processing plants, and any application where fire safety, reliable sealing, and the need for safe maintenance isolation are key concerns.
Q7: What is the typical delivery time for a custom-sized or special material valve?
A7: Standard sizes and common material grades are often available from stock or have shorter lead times. For customized orders involving special materials (like duplex stainless steel), specific trim, or unusual dimensions, our engineering team will provide a detailed production schedule upon receipt of your inquiry, typically ranging from 8 to 16 weeks.
Q8: Do you provide testing and inspection documentation with the valves?
A8> Yes, as a standard practice, each valve undergoes rigorous factory acceptance testing. Documentation such as Material Test Reports (MTRs), hydrostatic test reports, and fire test certificates (if applicable) can be provided. Third-party inspection (like DNV, Lloyds, or SGS) is also available upon request.
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