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Help CenterTwo-Wire System 4-20mA Proportional Control Marine Butterfly Valve, 304/316 Stainless Steel Body
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As a leading manufacturer with a strong commitment to quality and innovation since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our advanced Two-Wire System 4-20mA Proportional Control Marine Butterfly Valve. Engineered for precision and durability in demanding environments, this valve is a cornerstone for modern fluid control systems, particularly in marine applications where reliability is non-negotiable. Our extensive experience, backed by ISO9001 certification, ensures that every valve meets rigorous standards, providing our global clientele across North America, Europe, Asia, and beyond with a dependable solution for accurate flow regulation. This product embodies our dedication to combining robust stainless steel construction with intelligent proportional control, offering superior performance that enhances operational efficiency and system integration.
This proportional control butterfly valve is designed to deliver precise flow modulation in response to a standard 4-20mA control signal. Its core advantages stem from a seamless integration of a high-quality valve body and a smart electric actuator.
- Precision Proportional Control: The two-wire 4-20mA input allows for continuous and precise positioning of the valve disc, enabling accurate flow, pressure, or temperature control within your system. This linear relationship between signal and valve position ensures repeatable and reliable process management.
- Robust Marine-Grade Construction: The valve body is crafted from either 304 or 316 stainless steel, providing exceptional resistance to corrosion, pitting, and the harsh conditions found in marine, offshore, and coastal industrial applications. This material choice guarantees a long service life and minimal maintenance.
- Simplified Installation and Wiring: The two-wire system significantly reduces installation complexity and cost compared to traditional three or four-wire setups. It combines power and signal in the same pair of wires, making system integration straightforward and efficient.
- Versatile Actuator Performance: The integrated electric actuator features fail-safe options (spring return or battery backup available upon request), manual override capability, and local indication. It is designed for high cycle life and stable operation under varying load conditions.
- Excellent Sealing and Flow Characteristics: Equipped with high-performance seat materials like PTFE, EPDM, or Viton, the valve ensures bubble-tight shut-off and low torque operation. The disc design optimizes flow with minimal pressure drop, enhancing overall system energy efficiency.
Key technical specifications for standard models are summarized in the table below. Custom configurations for pressure ratings, sizes, and seat materials are available to meet specific project requirements.
| Parameter | Specification |
|---|---|
| Body Material | 304 / 316 Stainless Steel |
| Control Signal | Two-Wire, 4-20mA DC |
| Nominal Pressure (PN) | 10, 16 |
| Temperature Range (Standard Seat) | -20°C to +150°C |
| Leakage Class | ANSI Class VI (with soft seat) |
| Valve Size Range (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600 |
| Input Power (for Actuator) | 24V DC / 110V AC / 220V AC (Optional) |
| Protection Class (Actuator) | IP67 (Standard), IP68 (Optional) |
| Connection Standards | ISO, ANSI, DIN, JIS (Customizable) |
The benefits of choosing our proportional control valve extend directly to your operational bottom line. You gain a system component that enhances process accuracy, reduces manual intervention, and allows for seamless integration into Distributed Control Systems (DCS) or Programmable Logic Controller (PLC) networks. Its low maintenance design and corrosion-resistant build decrease lifecycle costs, while the simplified wiring saves on initial installation time and expenses. For marine engineers and system integrators, this valve provides a reliable, compliant solution for critical applications such as ballast water control, cooling systems, fuel handling, and chemical dosing.
With an annual export value reflecting our global reach and trust from clients in over a dozen major markets, Shanghai Zhibang Valve stands as a reliable partner for your fluid control needs. Our valves are shipped from major ports like Shanghai and Guangzhou, ensuring timely delivery worldwide. The ISO9001 certified manufacturing process is a testament to our unwavering focus on quality control and consistency. We encourage you to leverage our expertise—contact us today to discuss how this high-performance proportional control butterfly valve can be customized to optimize your specific marine or industrial application, providing you with a durable, precise, and cost-effective control solution.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a two-wire 4-20mA system over a three-wire system?
A: The primary advantage is simplified installation and reduced wiring costs. A two-wire system uses the same pair of wires to both power the actuator and carry the 4-20mA control signal, eliminating the need for a separate power cable. This makes it easier and more economical to install, especially over long distances.
Q2: Is this valve suitable for seawater applications?
A: Yes, particularly when ordered with a 316 stainless steel body. 316 stainless steel offers superior resistance to chloride-induced corrosion (like pitting and crevice corrosion) compared to 304, making it a preferred choice for direct seawater, brackish water, and other highly corrosive marine environments.
Q3: Can the valve be controlled manually if the electrical signal fails?
A: Yes. The electric actuator is equipped with a manual override feature. This allows operators to manually position the valve disc using a handwheel or lever in case of a power loss or control system failure, ensuring operational continuity.
Q4: What types of seat materials are available, and how do I choose?
A: Common seat materials include PTFE (for wide chemical resistance and temperatures up to 180°C), EPDM (for hot water and steam), and Viton/FKM (for oils, fuels, and aromatic hydrocarbons). The choice depends on the fluid media, temperature, and pressure in your specific application. Our technical team can assist in selection.
Q5: What is the delivery lead time for standard sizes?
A: For standard configurations and sizes within our DN50 to DN600 range, typical lead times are competitive. Exact timelines can be confirmed upon order placement and are influenced by current production schedules and customization requirements. We strive for efficient delivery from our Shanghai base.
Q6: Do you provide technical support for system integration?
A> Absolutely. As a manufacturer, we offer comprehensive technical support. This includes providing detailed wiring diagrams, dimensional drawings, I/P (current to pressure) curve data, and guidance on integrating the valve with your PLC or DCS to ensure optimal system performance.
Q7: Are custom pressure ratings and flange standards available?
A: Yes. While standard models are rated for PN10/16, we can engineer valves for higher pressure classes upon request. We can also manufacture valves to conform to various international flange standards such as ANSI, DIN, JIS, or ISO based on your project specifications.
Q8: How does the proportional control feature improve process efficiency?
A: Proportional control allows for precise, continuous adjustment of flow rate rather than simple on/off operation. This enables finer process control (e.g., maintaining exact temperature or pressure setpoints), reduces system shocks from sudden valve movements, saves energy by matching flow to demand, and can improve product quality in process industries.
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