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Help CenterTriple Eccentric Butterfly Valve for Marine Engine Room Seawater Cooling Systems, API 609 Compliant
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Triple Eccentric Butterfly Valve designed specifically for marine engine room seawater cooling systems. As a dedicated manufacturer since 2016, we have been supplying high-performance valves to global markets including North America, Europe, and Southeast Asia. This valve is engineered to withstand the harsh saline environment of marine applications while delivering bubble-tight shut-off and extended service life. With ISO9001 certification and API 609 compliance, our triple eccentric butterfly valve ensures reliable performance in critical seawater cooling circuits, reducing maintenance costs and enhancing system efficiency.
The triple eccentric design (also known as triple offset) eliminates friction between the seat and disc during opening and closing, providing a long-lasting, wear-resistant sealing surface. This makes the valve ideal for demanding marine environments where corrosion, high pressure, and temperature fluctuations are common. Our valve is available in a wide range of sizes and materials to meet specific shipbuilding requirements.
Key Features & Technical Specifications
- Triple Offset Geometry: Ensures zero contact between seat and disc except at full closure, reducing torque requirements and extending seal life.
- Bubble-Tight Shut-Off: Achieves API 598 Class V or VI leakage rates, preventing backflow in seawater lines.
- Corrosion-Resistant Materials: Available in duplex stainless steel, super duplex, nickel-aluminum bronze, and other marine-grade alloys.
- API 609 Compliant: Meets dimensional and performance standards for butterfly valves, ensuring interchangeability and reliability.
- High Pressure & Temperature Capability: Suitable for pressures up to 40 bar and temperatures from -20°C to 150°C (higher range available on request).
- Low Torque Operation: The eccentric design reduces actuation torque, allowing use of smaller, more economical actuators.
- Bi-Directional Flow: Functions effectively in both flow directions, simplifying piping layout.
- Fire-Safe Design: Optional fire-safe packing according to API 607 can be provided.
| Parameter | Value / Range |
|---|---|
| Size Range | DN50 – DN1200 (2” – 48”) |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 (Class 150 / Class 300) |
| Body Material | WCB, CF8M, Duplex 2205, Super Duplex 2507, Nickel Aluminum Bronze |
| Seat Material | PTFE, RTFE, PEEK, Metal (Stellite overlay) |
| Connection Type | Wafer, Lug, Double Flanged |
| Operation | Manual (lever/gear), Pneumatic, Electric, Hydraulic |
| Leakage Rate | API 598 Class V (Zero leakage) / Class VI |
| Standards | API 609, ISO 17292, ASME B16.34, ISO9001 |
Our triple eccentric butterfly valve offers significant advantages over conventional concentric or double offset valves. The zero-friction sealing mechanism eliminates seat wear, ensuring consistent bubble-tight performance over thousands of cycles. In marine seawater cooling systems, this translates to reduced downtime for maintenance, lower spare parts inventory, and improved system water quality. The valve's streamlined flow path minimizes pressure drop, which is critical for pump efficiency in engine room circuits.
We provide comprehensive testing and documentation with each valve, including hydrostatic shell test, seat leakage test, material certificates, and dimensional inspection reports. Our valves are shipped from major Chinese ports (Shanghai, Guangzhou, Hong Kong, Beijing) with careful packaging to prevent damage during transit.
With over 7 years of manufacturing experience and annual export value exceeding US$1 million, Shanghai Zhibang Valve has built a reputation for delivering reliable fluid control solutions to shipyards, offshore platforms, and marine engineering companies worldwide. Our ISO9001-certified quality management system ensures every valve meets stringent international standards. We invite you to experience the durability and efficiency of our triple eccentric butterfly valve for your next marine project. Contact us today for a quotation or technical consultation – we look forward to partnering with you.
Frequently Asked Questions
Q1: What is the difference between a triple eccentric and a double offset butterfly valve?
A: Triple eccentric (triple offset) adds a third offset to the seat axis, creating a cam effect that lifts the disc away from the seat during opening. This eliminates friction and wear completely, providing a longer service life and bubble-tight shut-off even after many cycles, whereas double offset still has some sliding contact.
Q2: Is this valve suitable for seawater applications with high chloride content?
A: Yes, we offer materials specifically selected for seawater corrosion resistance, such as super duplex stainless steel and nickel-aluminum bronze. These alloys withstand pitting and crevice corrosion in marine environments.
Q3: What certifications do you provide with the valve?
A: Standard documentation includes ISO9001 quality certificate, material test reports (EN 10204 3.1), pressure test certificates, and dimensional inspection report. API 607 fire-safe certification and NACE MR0175 compliance are available as options.
Q4: Can the valve be automated with pneumatic or electric actuators?
A: Absolutely. We offer a full range of actuators (pneumatic, electric, hydraulic) from trusted brands, pre-mounted and tested at our factory. The low torque requirement of the triple eccentric design allows for smaller actuator selection.
Q5: What is the typical delivery time for standard sizes?
A: For standard sizes (DN80–DN300) with common materials, delivery is typically 30–45 days after order confirmation. Larger sizes or special materials may require 50–70 days. We can expedite urgent orders upon request.
Q6: Does your valve meet API 609 Category B or Category C?
A: Our standard design conforms to API 609 Category B (reduced bore) requirements. Full bore (Category C) is available on request. Please specify your application needs when inquiring.
Q7: How do you ensure the valve’s sealing performance over time?
A: The triple offset geometry minimizes contact pressure on the seat, reducing wear. Additionally, we use high-grade seat materials (PEEK, Stellite) that resist deformation. All valves undergo a 100% seat leakage test before shipment.
Q8: Can I get a sample valve for testing before bulk order?
A: Yes, sample orders are welcome. We can provide a single valve with necessary documentation for your evaluation. Contact our sales team to discuss sample terms and lead time.
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