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Help CenterMarine Double Eccentric Lug Butterfly Valve GB/T3037-94 Electric/Pneumatic/Hydraulic Actuator Optional
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Shanghai Zhibang Valve Manufacture Co., Ltd. (established in 2016) proudly presents our Marine Double Eccentric Lug Butterfly Valve designed to the GB/T3037-94 standard. This heavy-duty valve is engineered for demanding marine and offshore applications, offering superior sealing, long service life, and low torque operation. With optional electric, pneumatic, or hydraulic actuators, it provides flexible automation solutions for ship piping systems, ballast water treatment, and seawater cooling lines. Our ISO9001-certified manufacturing ensures consistent quality, and our valves are trusted by clients across North America, Europe, Asia, and beyond.
Key Features & Technical Specifications
- Double Eccentric Design – Reduces friction between disc and seat, ensures bubble-tight shut-off, and extends seal life.
- Lug Type Connection – Allows easy installation between flanges and enables isolation of downstream piping without removing the entire valve.
- Compliant with GB/T3037-94 for marine valves, ensuring reliable performance in corrosive seawater environments.
- Bi-directional Sealing – Capable of handling flow in both directions with zero leakage (tested to API 598).
- Multi-Actuator Ready – Mounting flange per ISO 5211, compatible with electric, pneumatic, or hydraulic actuators (supplied on request).
- Available in a wide range of materials: Ductile Iron, WCB, CF8M, Al Bronze, Duplex Stainless Steel – customizable for specific marine conditions.
- Seat options: PTFE, EPDM, NBR, Metal Seal for high-temperature or abrasive media.
- Corrosion-resistant coating – Epoxy paint or hot-dip galvanizing for extended service life in marine atmospheres.
- Low operating torque – reduces actuator size and cost.
| Parameter | Details |
|---|---|
| Design Standard | GB/T3037-94 |
| Pressure Rating | PN10 / PN16 / PN25 (Class 150 & 300 available) |
| Size Range | DN50 – DN1200 (2" – 48") |
| Temperature Range | -20°C to +200°C (depending on seat material) |
| Leakage Rate | Zero leakage (bubble-tight) per API 598 |
| Actuator Options | Electric (multi-turn / quarter-turn), Pneumatic (double-acting / spring-return), Hydraulic (manual or automatic) |
| Mounting Flange | ISO 5211 (standard), customizable |
Advantages for Your Marine Applications
- Reliable Isolation – The double eccentric design ensures tight shut-off even after thousands of cycles, reducing maintenance downtime.
- Space Saving – Lug pattern allows installation between flanges, eliminating the need for additional gaskets and reducing overall weight.
- Corrosion Resistance – Choose from marine-grade materials (Al Bronze, Duplex, Super Duplex) to withstand aggressive seawater and chloride environments.
- Automation Ready – Pre-drilled mounting pad and keyed shaft make actuator integration simple; we can supply fully assembled units with actuator and control accessories.
- Cost-Effective – Lower torque means smaller actuators are needed, saving capital and energy costs.
- Global Compliance – Meets GB/T3037-94 and can be manufactured to meet other international standards (ISO, API, EN) upon request.
Trusted Partner for Marine Valves
Shanghai Zhibang Valve Manufacture Co., Ltd. has been a dedicated manufacturer since 2016. With an annual export value of US$1 Million – US$1.5 Million, we export to major markets including North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. Our valves are shipped from Shanghai, Guangzhou, Hong Kong, and Beijing ports, ensuring fast logistics. We hold ISO9001 certification, reflecting our commitment to quality management and continuous improvement. Every valve undergoes rigorous testing – including hydrostatic, pneumatic, and leakage tests – before delivery. Our technical team provides prompt support, and we offer customization for materials, actuators, and special coatings. Contact us today for a quote or technical consultation – we are ready to supply the best marine butterfly valve for your project.
Frequently Asked Questions
Q1: What is the difference between a double eccentric and a concentric butterfly valve?
A: Double eccentric valves have the disc offset from the centerline of the valve and the seat, which reduces wear and provides tighter sealing, especially in high-pressure or high-temperature applications. Concentric valves are simpler but less suitable for harsh marine conditions.
Q2: Can this valve be used for both on/off and throttling control?
A: Yes, the double eccentric design allows for precise throttling (modulating) control, especially when combined with an electric or pneumatic actuator with positioner. For continuous throttling, we recommend selecting a hard-faced seat and disc.
Q3: What actuator options are available, and how do I choose?
A: We offer electric (multi-turn and quarter-turn), pneumatic (double-acting and spring-return), and hydraulic actuators. The choice depends on your power source, control system, and required torque. We can help size the actuator based on your operating conditions.
Q4: Is the valve suitable for seawater applications?
A: Absolutely. With proper material selection (e.g., Al Bronze disc, Duplex body, or EPDM seat), the valve is highly resistant to seawater corrosion. We recommend Nickel-Aluminum Bronze or Super Duplex for the most demanding marine environments.
Q5: What is the lead time?
A: Standard sizes (DN50–DN300) typically ship within 15–30 days. Larger sizes or custom actuators may require 30–45 days. Please contact us for an accurate lead time based on your specifications.
Q6: Do you provide certificates of material or test reports?
A: Yes, we can provide Material Test Certificates (MTC) per EN 10204 3.1, Hydrostatic Test Reports, and other documentation as required. Our ISO9001 quality system ensures traceability.
Q7: Can the valve be supplied with a manual override or gearbox?
A: Yes, manual override handwheels or gearboxes are available for electric and pneumatic actuators. Hydraulic actuators can also be supplied with manual hand pumps.
Q8: What is the warranty period?
A: We offer a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranties are available upon request.
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