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Help CenterMarine Double Eccentric Butterfly Valve With Metal Hard Seal for High Pressure Systems
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As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve is dedicated to engineering robust flow control solutions for demanding industrial environments. Our Marine Double Eccentric Butterfly Valve with Metal Hard Seal is specifically engineered to address the challenges of high-pressure systems, offering superior sealing performance, exceptional durability, and reliable operation under extreme conditions. This valve represents our commitment to providing high-quality, dependable products that meet the stringent requirements of global markets, from marine applications to power generation.
Core Technology & Design Advantages:
This valve utilizes a double eccentric (double-offset) design, which fundamentally reduces wear and ensures a tight seal. The primary eccentric shifts the shaft axis behind the sealing line, while the secondary eccentric angles the shaft axis. This combined action ensures the disc only contacts the seat during the final few degrees of closure, minimizing friction and extending service life dramatically.
- Zero-Leakage Performance: The metal-to-metal hard seal provides bubble-tight shut-off even after thousands of cycles, making it ideal for critical isolation services.
- High Pressure & Temperature Capability: Engineered for systems up to PN63/Class 300 and temperatures ranging from -29°C to +425°C, it handles steam, aggressive chemicals, and abrasive media.
- Corrosion & Abrasion Resistance: The disc and seat are often made from or coated with hardened stainless steel or special alloys (like Stellite), offering excellent resistance to seawater, sour gas, and particulate-laden flows.
- Low Torque Operation: The eccentric design significantly reduces operating torque compared to concentric designs, allowing for smaller, more cost-effective actuators and reducing wear on the valve stem and bearings.
- Bidirectional Sealing: Provides effective sealing against pressure from either direction, enhancing system safety and flexibility.
- Compact & Lightweight: Compared to gate or globe valves of similar pressure rating, the butterfly design offers a more compact profile and lower weight, saving space and simplifying installation, especially in space-constrained marine environments.
Technical Specifications & Configuration Options:
| Parameter | Specification / Option |
|---|---|
| Design Standard | API 609, MSS SP-68, ISO 10631 |
| Pressure Rating | PN16, PN25, PN40, PN63 / Class 150, Class 300 |
| Size Range | DN50 to DN1200 (2" to 48") |
| Body Material | WCB, LCB, CF8, CF8M, Ductile Iron, etc. |
| Disc Material | SS316, SS316L with Hard Faced Coating (optional) |
| Seat Material | SS316, Alloy 20, Monel, Stellite overlay |
| Stem Material | SS416, 17-4PH, with optional hardening |
| Operation Mode | Manual Lever, Worm Gear Operator, Electric Actuator, Pneumatic Actuator |
| End Connection | Wafer, Lug, Double Flange (RF, RTJ face) |
| Leakage Class | ANSI/FCI 70-2 Class VI (Bubble Tight) or Class IV |
Application Benefits for Your Business:
- Enhanced System Reliability: Minimizes unplanned downtime in critical high-pressure pipelines for seawater cooling, fuel oil, ballast, and firefighting systems on ships and offshore platforms.
- Reduced Lifetime Cost: The extended service life and minimal maintenance requirements lower the total cost of ownership. The low-torque design also reduces energy consumption for actuation.
- Safety Compliance: The robust metal seal and fire-safe design (if required) help meet stringent maritime and industrial safety standards.
- Operational Flexibility: Suitable for both isolation and throttling services in high-pressure drops, offering a versatile solution for complex system designs.
- Global Supply Chain Support: With annual exports valued between US$1-1.5 million and major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely and efficient delivery to our customers across North America, South America, Europe, Asia, Africa, and Oceania.
Trust in a product backed by a manufacturer with nearly a decade of specialization in valve manufacturing and a proven global footprint. Our ISO9001-certified processes guarantee consistent quality, while our experience supplying to diverse international markets means we understand the specific needs of marine and high-pressure applications. This valve is not just a component; it's a commitment to the integrity and efficiency of your system. Contact Shanghai Zhibang Valve today to discuss your project requirements and receive a detailed quotation tailored to your needs.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a double eccentric design over a single eccentric or concentric design?
A: The double eccentric design offers two key offsets. This geometry ensures minimal contact between the disc and seat during operation, drastically reducing wear and friction. This translates to lower operating torque, a much longer service life, and more reliable sealing performance, especially under high-pressure conditions.
Q2: Can this valve be used for both on/off and flow control (throttling) applications?
A: Yes, while it excels as a tight-shutoff isolation valve, its design also allows for effective flow modulation. The characteristic flow curve is favorable for throttling, making it a versatile choice for systems requiring both functions.
Q3: What materials are recommended for seawater (marine) applications?
A: For superior corrosion resistance in seawater, we typically recommend a body material like Duplex Stainless Steel (e.g., CF3M/CF8M for the body and disc) and a hardened stainless steel or cobalt-based alloy (e.g., Stellite) seat. Specific material selection depends on temperature, pressure, and fluid composition.
Q4: Is this valve fire-safe certified?
A> Fire-safe versions are available upon request. These valves are designed and tested to API 607 or API 6FA standards to maintain a seal and prevent external leakage in the event of a fire, which is critical for offshore and hydrocarbon processing applications.
Q5: What types of actuators are compatible with this valve?
A: The valve is designed to be compatible with a wide range of actuators. We can supply it with a manual gearbox, or it can be fitted with electric, pneumatic (double-acting or spring-return), or hydraulic actuators from various brands. The low torque requirement simplifies actuator sizing and selection.
Q6: What is the typical delivery lead time for a custom-configured order?
A: Lead time varies based on size, material, and actuator specifications. Standard configurations typically have a shorter lead time. As an experienced exporter, we optimize our supply chain for efficiency. Please contact us with your specific requirements for an accurate delivery schedule.
Q7: Do you provide documentation and certification with the valves?
A> Yes, we provide comprehensive documentation, including material test certificates (MTC), pressure test reports, dimensional drawings, and operation manuals. Our manufacturing is ISO9001 certified, ensuring traceability and quality control.
Q8: How does the metal hard seal compare to a soft-seat (elastomer) seal in terms of performance?
A: Metal hard seals offer far superior resistance to high temperatures, pressure, abrasion, and chemical attack compared to soft seats. They provide a longer service life in harsh environments but may have a slightly higher initial cost. Soft-seat valves offer excellent sealing at lower pressures and temperatures but are not suitable for the demanding conditions this valve is designed for.
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