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Help CenterElectric Marine Butterfly Valve With 4-20mA Control, Supplied With Full Mill Test Report and 2-Year Warranty
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As a leading manufacturer with ISO9001 certified production since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd is dedicated to providing high-performance fluid control solutions for demanding marine environments. Our Electric Marine Butterfly Valve with 4-20mA Control represents our commitment to reliability, precision, and comprehensive quality assurance. Engineered specifically for offshore and marine applications, this valve combines robust construction with intelligent control capabilities, ensuring precise flow regulation in critical seawater cooling, ballast, firefighting, and bilge systems. Each unit is supplied with a full Mill Test Report, providing complete traceability of materials and manufacturing processes, backed by our substantial 2-year warranty for your peace of mind.
The core value of this product lies in its seamless integration of durable marine-grade components with sophisticated electronic control. The 4-20mA analog control signal interface allows for smooth, proportional valve positioning and seamless integration into existing shipboard Distributed Control Systems (DCS), Programmable Logic Controllers (PLC), or centralized monitoring stations. This enables precise flow modulation rather than simple on/off operation, which is crucial for maintaining optimal system parameters in dynamic marine conditions. Our valves are designed to withstand the corrosive effects of saltwater, vibration, and temperature fluctuations common in maritime operations.
Key Technical Features & Advantages:
- Intelligent Electric Actuator: Features a built-in controller that accepts the standard 4-20mA control signal. It provides precise modulating control, position feedback (4-20mA or potentiometer), and local manual override capability for emergency operation.
- Marine-Specific Design: The valve body, disc, and stem are constructed from materials with proven corrosion resistance for seawater service, such as CF8M stainless steel or specially coated carbon steel. Seals are selected from EPDM or Viton for long life against seawater.
- Robust Construction & Leakage Protection: Features a double-sealed stem design to prevent leakage to the atmosphere. The disc-to-shaft connection is secure and designed to handle high torque without failure.
- Fail-Safe Options: The electric actuator can be configured with spring-return fail-safe mechanisms (fail-open or fail-close) to ensure the valve moves to a predetermined safe position upon power or signal loss, enhancing system safety.
- Easy Integration & Diagnostics: Comes with standard conduit entries and terminal boxes rated for the marine environment. Many models include LED indicators for power and valve position, simplifying installation and troubleshooting.
The following table outlines some of the standard specifications available. Custom configurations for specific voltage, signal type, or materials are available upon request.
| Parameter | Specification / Option |
|---|---|
| Standard Size Range | DN50 (2"), DN80 (3"), DN100 (4"), DN150 (6"), DN200 (8"), DN250 (10"), DN300 (12"), DN350 (14"), DN400 (16") |
| Pressure Rating | PN10, PN16, PN25, ANSI Class 150, Class 300 |
| Body Material (Common) | Ductile Iron (EN-GJS-400-18), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
| Disc Material | Stainless Steel (CF8/CF8M), Ductile Iron with Ni-plate or Epoxy Coating |
| Seat Material | EPDM (Seawater), NBR, PTFE, Viton (FKM) |
| Actuator Power | 24VDC, 110VAC, 220VAC, 380VAC 50/60Hz |
| Control & Feedback Signal | 4-20mA Input (Control), 4-20mA or Potentiometer Output (Position Feedback) |
| Operating Temperature | -10°C to +120°C (Standard Seat), Higher ranges with special seats |
| Ingress Protection (IP) | IP67 (Standard for actuator enclosure) |
Benefits for Your Marine Operations:
- Enhanced Process Control: Precise 4-20mA modulation allows for fine-tuned control of flow rates, pressure, and tank levels, improving the efficiency and stability of marine engineering systems.
- Reduced Maintenance & Downtime: The robust design and corrosion-resistant materials minimize failures. The included 2-year warranty and full test documentation reduce lifecycle costs and operational risks.
- Simplified Automation Integration: The standard industrial signal interface allows for quick and reliable connection to existing ship automation systems, reducing commissioning time and complexity.
- Global Compliance & Support: Manufactured in an ISO9001 facility, our products are trusted in global markets from North America and Europe to Southeast Asia and Africa. We support shipment from major ports including Shanghai, Guangzhou, and Hong Kong.
Trust in a product backed by a manufacturer with a proven track record. Shanghai Zhibang Valve has been serving a global clientele since 2016, with an annual export value demonstrating our capacity and reliability. Our valves are specified for projects worldwide, from offshore platforms to commercial vessels, supported by our presence in key markets across every continent. The combination of the full Mill Test Report—documenting chemical composition, mechanical properties, and pressure tests—and the comprehensive 2-year warranty provides unparalleled assurance of quality and performance. For a reliable, precisely controllable valve solution that meets the stringent demands of the marine industry, contact us today to discuss your specific requirements or to request a detailed quotation.
Frequently Asked Questions (FAQ)
-
Q: What is the significance of the 4-20mA control signal?
A: The 4-20mA signal is an industry-standard analog protocol for process control. It allows for proportional valve positioning (0-100% open) based on the current value, enabling precise flow modulation rather than simple open/close operation. It is also highly resistant to signal degradation over long distances on a ship. -
Q: Is this valve suitable for raw seawater service?
A: Yes, it is specifically designed for marine applications. When ordered for seawater, we recommend material combinations like stainless steel (CF8M) body/disc with EPDM seats, which provide excellent corrosion resistance against saltwater. -
Q: What does the "Full Mill Test Report" include?
A: This report, also known as a Material Test Report (MTR), provides traceability and verification. It typically includes the heat number, chemical analysis, mechanical properties (tensile, yield, elongation), and results of hydrostatic pressure tests performed on the valve body, proving it meets the specified material standards. -
Q: Can the valve be operated manually if the power fails?
A: Yes. The electric actuator is equipped with a manual handwheel or lever for local manual operation in case of power loss. Additionally, spring-return fail-safe actuators can be specified to automatically drive the valve to a safe position (open or closed) upon power failure. -
Q: What are my options for power supply voltage?
A: We offer actuators compatible with common marine and industrial power supplies, including 24VDC, 110VAC, 220VAC, and 380VAC, in both 50Hz and 60Hz frequencies. Please specify your vessel's or platform's standard voltage during inquiry. -
Q: How is the 2-year warranty structured?
A: Our warranty covers defects in materials and workmanship under normal use for a period of 24 months from the date of shipment. It includes repair or replacement of faulty components. The warranty terms and conditions are provided with the commercial documentation. -
Q: Do you offer different connection types besides wafer?
A: Absolutely. While wafer-type is common for space-saving, we also offer lug-style (for end-of-line service or dead-end pressure) and double flanged connections to match your existing piping system specifications. -
Q: Can you provide valves with different certifications like ABS, DNV, or LR?
A: We can provide valves suitable for classification society rules. Specific certification marking requires approval from the respective society and may involve additional witness testing. Please inform us of your certification requirements upfront so we can advise on the available options.
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