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Help CenterTriple Eccentric Hard Seal Butterfly Valve With On-site Technical Support for Marine Retrofit Projects
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As a professional manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Triple Eccentric Hard Seal Butterfly Valve, engineered specifically for demanding marine retrofit and upgrade projects. With our ISO9001-certified manufacturing processes and a dedicated focus on quality, we provide a reliable sealing solution that ensures long-term performance in critical shipboard applications. Our commitment extends beyond the product itself; we offer comprehensive on-site technical support to ensure seamless integration into your existing systems, minimizing downtime and operational risk. This valve is designed to replace traditional gate or globe valves in retrofit scenarios, offering superior flow control, zero leakage, and significantly reduced maintenance requirements for ship owners and operators.
Our triple eccentric hard seal butterfly valve is built to withstand the harsh conditions of marine environments, including exposure to seawater, corrosive fluids, and high-pressure systems. The unique design incorporates three distinct offsets: the first offset positions the shaft behind the seat, the second offsets the shaft axis from the pipe centerline, and the third employs a conical seat surface. This geometry ensures that the disc only contacts the seat at the final moment of closure, eliminating wear and friction during operation and guaranteeing a bubble-tight seal. The metal-to-metal hard seal construction provides exceptional fire safety and is suitable for a vast range of temperatures and pressures where elastomeric seals would fail.
Key Technical Features and Advantages:
- Bubble-Tight Shut-Off: Achieves zero leakage (Class VI or better per API 598/EN 12266-1) even after thousands of cycles, crucial for safety and environmental protection on vessels.
- Extended Service Life: The wear-free operation due to the triple offset design dramatically reduces maintenance intervals and total cost of ownership compared to concentric or double offset valves.
- Wide Material Compatibility: Available in various body, disc, and seat material combinations (e.g., carbon steel with Stellite seat, 316SS with Inconel seat) to handle seawater, ballast water, fuel oil, lube oil, steam, and aggressive chemicals.
- Bi-Directional Sealing: Provides reliable sealing against pressure from either direction, an essential feature for many marine piping layouts.
- Low Torque Operation: Requires significantly lower operating torque than gate valves, allowing for smaller, more cost-effective actuators and reducing strain on operating mechanisms.
- Compact & Lightweight Design: Ideal for space-constrained retrofit projects on ships, offering easier installation and weight savings.
Technical Specifications Table:
| Parameter | Specification / Option |
| Design & Testing Standards | API 609, ISO 10631, API 598, EN 12266-1 |
| Size Range (Nominal Diameter) | DN50 (2") to DN1200 (48") |
| Pressure Class (Common) | PN16, PN25, PN40 / Class 150, Class 300 |
| Seat Leakage Class | Class VI (Bubble-tight) per API 598 |
| Standard Face-to-Face | Per API 609 / ISO 5752 Series 20 |
| Flange Drilling | ANSI B16.5, EN 1092-1, JIS B2220, etc. |
| Fire Safe Design | Available (can be designed to meet API 607/API 6FA) |
On-Site Technical Support for Marine Retrofit Projects: We understand that retrofitting valves on an operational vessel is a complex task. Our support package can include:
- Pre-installation Survey: Our engineers can visit your shipyard or vessel to assess the existing piping, space constraints, and operating conditions.
- Installation Guidance & Supervision: We provide detailed installation manuals and can offer on-site supervision to ensure proper alignment, bolting, and commissioning.
- Operator Training: Training for your crew on the operation, maintenance, and troubleshooting of the new valves.
- Spare Parts & After-Sales: We maintain a stock of critical spare parts like seat rings and seals for prompt delivery to major ports worldwide.
Shanghai Zhibang has been a trusted valve manufacturer since 2016, with our products successfully exported to markets across North America, South America, Europe, Asia, Africa, and Oceania, achieving an annual export value in the range of US$1-1.5 million. This global reach is supported by flexible shipment options from key ports like Shanghai, Guangzhou, Hong Kong, and Beijing. Our ISO9001 certification underpins our consistent quality control from raw material inspection to final testing. For your next marine retrofit project, choose a valve supplier that combines robust product engineering with hands-on technical partnership. Contact us today for a detailed quotation, technical datasheets, or to discuss your specific application requirements.
Frequently Asked Questions (FAQ):
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Q: Why is a triple eccentric design better than a standard butterfly valve for marine retrofits?
A: The triple eccentric design eliminates sliding friction between the disc and seat during operation. This is critical for retrofit projects where long-term, maintenance-free performance is desired. It provides a reliable metal seal suitable for high temperatures and pressures common in ship systems, unlike rubber-seated valves that degrade. -
Q: Can this valve handle seawater and other corrosive media?
A: Yes. By selecting appropriate materials like 316 stainless steel, duplex stainless steel, or with special coatings (e.g., epoxy, nickel plating) for the body and internals, and corrosion-resistant alloys like Inconel for the seat, the valve is well-suited for seawater, ballast water, and other corrosive fluids. -
Q: What does "on-site technical support" typically include?
A: Our support is tailored to the project but generally covers pre-installation planning assistance, on-site or remote guidance during installation and commissioning, and operational training for your personnel. The exact scope is agreed upon during the project planning phase. -
Q: Are these valves fire-safe certified?
A> Fire-safe design is a key option. We can manufacture valves that meet the requirements of standards like API 607 or API 6FA, which include testing for seat leakage during and after a fire exposure. Please specify this requirement when inquiring. -
Q: How does the weight and space compare to the gate valve it might replace?
A: A triple eccentric butterfly valve is typically 30-60% lighter and requires considerably less installation space (face-to-face length) than a comparable gate valve. This makes handling and installation in tight engine rooms or piping racks much easier. -
Q: What types of actuators are compatible?
A> The valve can be fitted with manual gear operators, pneumatic actuators (double-acting or spring-return), electric actuators, or hydraulic actuators. We can supply the valve as a package with the actuator or provide interfaces for actuators from major brands. -
Q: What is your lead time for such valves?
A: Lead time depends on the size, material, pressure class, and quantity. Standard configurations in common sizes may have shorter lead times, while special materials or large diameters require longer. We provide a reliable delivery schedule upon order confirmation. -
Q: Do you offer customization for specific retrofit challenges?
A: Yes. We can discuss customizations such as special face-to-face dimensions to match existing piping, extended stems, special coatings, or unique flange standards to meet the specific needs of your retrofit project.
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