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Help CenterTwo-Piece Trunnion Mounted Marine Ball Valve, DIN 3357 PN25, With Anti-Static and Fire-Safe Design
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As a professional valve manufacturer with a strong presence in global marine and industrial markets, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Two-Piece Trunnion Mounted Marine Ball Valve. Engineered to meet the rigorous demands of marine applications, offshore platforms, and critical process industries, this valve combines robust construction with essential safety features. Our commitment to quality, backed by ISO9001 certification and over eight years of manufacturing expertise since 2016, ensures that every valve delivers reliable shut-off and long-term durability in the most challenging environments. We understand that downtime is not an option for your operations, which is why our design prioritizes safety, performance, and ease of maintenance.
This valve is specifically designed to provide a secure and leak-tight seal for pipelines handling seawater, fuel, lubricants, chemicals, and other fluids on vessels and coastal installations. The trunnion-mounted ball design is a key differentiator, offering superior performance for high-pressure applications compared to floating ball designs. Let's delve into the detailed features and technical specifications that make this valve an ideal choice for engineers and procurement specialists.
Core Product Features & Technical Advantages:
- Robust Trunnion-Mounted Design: The ball is supported by trunnions (stem extensions) at the top and bottom, which significantly reduces operating torque and minimizes seat wear. This design is exceptionally stable under high differential pressure, preventing the ball from shifting and deforming the seats, thereby ensuring a longer service life and more reliable sealing.
- Integrated Anti-Static Device: A critical safety feature for handling flammable fluids. This device, typically a spring-loaded ball or pin, provides a continuous electrical path between the ball, stem, and valve body. This safely dissipates any static electricity generated by fluid flow, eliminating the risk of sparks that could ignite the medium.
- Fire-Safe Design in Compliance with API 607/API 6FA & ISO 10497: In the event of a fire, the primary soft seats (e.g., PTFE) may be compromised. Our valve's fire-safe design incorporates secondary metal-to-metal sealing surfaces. If the soft seats are destroyed, these metal seats engage to maintain a seal, preventing catastrophic fluid release and helping to contain the fire.
- Two-Piece Body Construction: Offers a great balance between strength and maintenance accessibility. The body is split, typically along the pipeline axis, allowing for easier inline inspection and seat replacement compared to a one-piece design, without the need to fully remove the valve from the line.
- DIN 3357 PN25 Standard Compliance: Manufactured to the exacting dimensions and pressure ratings of the German DIN standard, ensuring compatibility with European and international piping systems. The PN25 rating indicates a nominal pressure of 25 bar, suitable for a wide range of marine and industrial services.
- Blow-Out Proof Stem: The stem is designed with a shoulder or step that is retained inside the valve body even under extreme pressure. This prevents the stem from being ejected under pressure, protecting personnel and equipment.
- Versatile Material Options: Available in various material combinations to suit specific media and environmental conditions (e.g., seawater, sour gas).
Standard Technical Specifications:
| Parameter | Specification / Option |
| Design & Construction Standard | DIN 3357 |
| Pressure Rating (Nominal) | PN25 (25 bar / ~362 psi) |
| Valve Size Range (DN) | DN15 to DN300 (1/2" to 12") |
| Body Material (Common) | WCB (A216), CF8 (304SS), CF8M (316SS), Duplex 2205 |
| Ball & Stem Material | Typically same as body or chrome-plated/SS |
| Seat Material (Standard) | Reinforced PTFE (RPTFE) |
| Seat Material (Fire-Safe) | PTFE Primary + Metal (Inconel/SS) Secondary |
| End Connection | Flanged, RF Face, as per DIN 2501/EN 1092-1 |
| Temperature Range (Standard Seat) | -20°C to +200°C (-4°F to +392°F) |
| Operation | Manual Lever, Gear Operator, Pneumatic/Hydraulic Actuator |
Benefits for Your Project:
- Enhanced Safety: The anti-static and fire-safe features directly address critical hazard scenarios, protecting assets and personnel, and helping you meet stringent safety regulations.
- Reduced Lifecycle Cost: The trunnion design's lower torque and reduced seat wear lead to less frequent maintenance and part replacement. The two-piece body further simplifies any required servicing.
- High Reliability & Zero Leakage: Engineered for bubble-tight shut-off (typically meeting standards like API 598), ensuring system integrity and preventing product loss or environmental contamination.
- Global Compatibility: Built to DIN standards, our valves integrate seamlessly into international projects, particularly those with European specifications or global maritime fleets.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of a trunnion-mounted ball valve over a floating ball valve?
A: The primary advantage is handling capability for higher pressure and larger sizes. The trunnion supports the ball, so the seat seals are not forced against the ball by line pressure. This results in much lower operating torque, especially in larger sizes and high-pressure classes, and reduces seat wear, extending service life.
Q2: How does the anti-static device work, and is it standard?
A: Yes, it is a standard feature for this marine-grade valve. It consists of a spring-loaded mechanism (ball or pin) that maintains contact between the ball and the body. When non-conductive fluid flows, static charge can build up on the ball. This device provides a path to ground through the stem and body, safely discharging the charge.
Q3: Can this valve be used for both on/off service and throttling?
A: Ball valves are primarily designed for on/off (isolation) service. While limited throttling is possible, it is not recommended for prolonged periods as it can cause cavitation, erosion of the ball and seats, and premature failure of the soft seats. For precise flow control, a control valve is the preferred choice.
Q4: What fire-safe testing standards does this valve conform to?
A: Our fire-safe design is engineered to meet the requirements of international standards such as API 607, API 6FA, and ISO 10497. These standards define rigorous testing procedures involving fire exposure while the valve is under pressure, followed by a leakage test to verify the secondary metal seal holds.
Q5: What actuator options are available?
A> The valve can be supplied with a manual lever for smaller sizes. For larger sizes or remote operation, we offer gear operators, as well as pneumatic (double-acting or spring-return) and electric actuators. The specific mounting interface (ISO 5211) is standard for compatibility.
Q6: Do you offer different seat materials for corrosive media?
A: Absolutely. While RPTFE is standard for general use, we can provide seats in materials like PEEK (for higher temperatures and chemicals), Nylon, or UHMW-PE for specific abrasive or corrosive services. Metal-seated versions are also an option for extreme temperatures or abrasive slurries.
Q7: What is the typical lead time for this product?
A: Lead time depends on size, material, and quantity. For standard configurations in common sizes and materials, we often have stock or short production cycles. Customized orders (special materials, actuators, coatings) require additional time. Please contact our sales team with your specific requirements for an accurate delivery schedule.
Q8: What documentation is provided with the valve?
We provide a comprehensive documentation package, which typically includes a Material Test Report (MTR/Certificate of Conformity), dimensional drawings, installation and maintenance manual, and a packing list. Certificates for fire-safe and anti-static features can be provided upon request.
Choosing Shanghai Zhibang Valve means partnering with a dedicated manufacturer that has successfully supplied reliable fluid control solutions across six continents, from North America and Western Europe to Southeast Asia and Africa. Our annual export volume of US$1-1.5 million is a testament to the trust placed in us by a global clientele. Every valve is produced under our ISO9001 quality management system, ensuring consistent performance and traceability. We support your projects with flexible logistics, shipping from major ports like Shanghai, Guangzhou, and Hong Kong. For your next marine, offshore, or critical industrial application, select a valve engineered for safety, durability, and compliance. Contact us today to discuss your specifications, request a quote, or obtain detailed technical data sheets.
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