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Help CenterMarine-grade Triple Eccentric Butterfly Valve With Extended Stem for Deep Tank Installations
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As a specialized valve manufacturer with years of expertise in fluid control solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our high-performance Marine-grade Triple Eccentric Butterfly Valve with Extended Stem. Engineered specifically for the demanding environments of deep tank installations on vessels and offshore platforms, this valve represents a significant advancement in reliability and longevity for critical marine applications. Our commitment to quality, backed by ISO 9001 certification and an annual export value exceeding one million US dollars, ensures that every valve meets the stringent requirements of global maritime operations across North America, Europe, Asia, and beyond.
The triple eccentric design is the cornerstone of this valve's superior performance. Unlike conventional butterfly valves, this geometry ensures a completely frictionless operation from the open to the closed position, eliminating wear on the sealing surfaces and guaranteeing a bubble-tight shut-off even after thousands of cycles. This is particularly crucial for deep tanks where valve failure can lead to catastrophic consequences. The extended stem is a custom-engineered feature, allowing for safe and accessible operation of valves installed in deep, hard-to-reach tank wells or behind thick insulation, a common challenge in shipbuilding and offshore construction.
- Zero-Leakage Metal Seat: The triple offset design combined with a precision-machined metal-to-metal seat ensures a reliable, bubble-tight seal. This makes it ideal for handling a wide range of media including seawater, fuel oil, lube oil, chemicals, and even cryogenic fluids, without the degradation issues associated with soft seats.
- Corrosion-Resistant Construction: Manufactured from marine-grade materials like 316/316L stainless steel, duplex stainless steel, or specially coated carbon steel, the valve offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in harsh saline and chemical environments.
- Extended Stem for Deep Tanks: The stem can be extended to precise customer specifications, typically ranging from 200mm to 2000mm. This allows the actuation mechanism (hand lever, gearbox, or actuator) to be located in an easily accessible area, simplifying maintenance and enhancing operational safety.
- Low Torque Operation: The eccentric design significantly reduces operating torque by up to 70% compared to double-offset or concentric designs. This translates to smaller, more cost-effective actuators, reduced wear on gearboxes, and easier manual operation.
- Bidirectional Sealing Capability: The valve provides reliable sealing against pressure from both flow directions, a critical feature for applications where flow reversal or backpressure is possible.
- Fire-Safe Design (Optional): Available with fire-safe certification features, where the metal seat provides a secondary seal in the event of a fire, preventing the escalation of an emergency.
To provide a clear overview of the standard specifications, refer to the following table which outlines key parameters for our most common valve series. Custom configurations outside these ranges are available upon request to meet your specific project needs.
| Parameter | Specification / Range | Notes |
|---|---|---|
| Design Standard | API 609, ISO 10631, MSS SP-68 | Compliant with major international standards |
| Size (Nominal Diameter) | DN50 (2") to DN1200 (48") | Larger sizes available for special order |
| Pressure Rating | PN10/16/25/40/64 Class 150/300 |
Suitable for most tank and pipeline services |
| Temperature Range | -196°C to +550°C | Material dependent; consult for extremes |
| Stem Extension | Standard + 200mm to 2000mm | Fabricated from a single piece for strength |
| End Connection | Wafer, Lug, Double Flange (RF/RTJ) | To match your piping specifications |
The benefits of choosing our marine-grade triple eccentric valve extend far beyond its specifications. For shipyards and offshore operators, it means reduced lifecycle costs through minimal maintenance, enhanced system safety with reliable shut-off, and increased operational efficiency due to its easy operation. The extended stem option eliminates the need for complex access platforms or hatches, saving on installation space and structural costs. Furthermore, its robust construction ensures compliance with the strict classification society rules from organizations like DNV, ABS, LR, and BV, which is a prerequisite for global maritime projects.
Shanghai Zhibang's valves are trusted by partners across six continents, from the shipbuilding hubs of East Asia and the oil & gas fields of the Middle East to the naval fleets of Europe and North America. Our established export channels through major ports like Shanghai, Guangzhou, and Hong Kong ensure timely and efficient delivery to your project site, anywhere in the world. We invite you to leverage our manufacturing expertise to specify a valve solution that delivers uncompromising performance for your deepest and most critical tank installations. Contact our engineering team today with your pressure, temperature, media, and dimensional requirements for a detailed quotation and technical support.
- Q1: What is the main advantage of a triple eccentric design over a double eccentric or concentric butterfly valve?
- The primary advantage is a true frictionless operation and a metal-to-metal sealing surface. The third offset (the conical angle of the seat) ensures the disc cam-lifts away from the seat immediately upon opening, eliminating rubbing and wear. This results in a longer service life, consistent bubble-tight shut-off, and significantly lower operating torque.
- Q2: How do I determine the correct length for the extended stem?
- The required extension length is determined by the distance from the valve's centerline to the desired location of the operating mechanism (e.g., handwheel), plus any clearance for insulation or a potential mounting bracket. Our technical team can provide calculation sheets or assist you based on your tank drawings and installation plans.
- Q3: Can this valve be used for seawater ballast systems?
- Yes, it is an excellent choice for seawater services. We recommend specifying a body and disc material of 316L stainless steel or super duplex stainless steel (e.g., UNS S32750) for optimal corrosion resistance against chlorides. The metal seat is also impervious to marine growth and abrasion from potential silt in the water.
- Q4: What types of actuators are compatible with this valve?
- The valve is designed to be compatible with all standard industrial actuators. We can supply or interface with electric actuators (on/off or modulating), pneumatic actuators (double-acting or spring-return), hydraulic actuators, as well as manual gear operators. The extended stem is machined with standard ISO or AWWA mounting interfaces.
- Q5: Is the extended stem a potential weak point? How is its strength ensured?
- The extended stem is not a separate welded piece; it is typically machined from a single, larger-diameter forged bar to maintain material integrity and torsional strength. The design calculations consider the full operating and seismic loads to ensure it meets or exceeds the strength of a standard stem. Material certifications and non-destructive testing are available.
- Q6: Do you offer fire-safe tested versions?
- Yes, we offer valves that conform to fire-safe testing standards such as API 607, API 6FA, or ISO 10497. In this configuration, the primary metal seat provides the main seal, and secondary graphite or flexible graphite seals are incorporated to maintain sealing integrity during and after a fire exposure test.
- Q7: What is your lead time for a custom valve with an extended stem?
- Lead time varies based on size, material, and quantity. For standard materials and sizes with a custom stem length, typical production time is 6-8 weeks. We maintain strategic stock of common components to expedite orders when possible. Please consult with our sales team for a precise schedule.
- Q8: Can you provide documentation for classification society approval?
- Absolutely. We regularly supply valves for projects requiring approval from major classification societies (ABS, DNV, LR, BV, etc.). We can provide material certificates (3.1/3.2), NDT reports, functional test reports, and a complete data book to support the approval process with your chosen society.
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