The product was last updated on 28/10/2025 at 09:06 am
In a modern industrial landscape that increasingly prioritizes efficiency, automation, and reliability, selecting fluid control devices is crucial. The EMEB-OSL cast iron body, stainless steel disc electric butterfly valve from EM-Flow (Taiwan) stands out as a comprehensive solution that perfectly meets the demanding requirements of various industries. This product not only inherits the outstanding advantages of traditional butterfly valves but also integrates a modern electric actuator, offering automated, precise, and durable operation.
The EMEB-OCW Electric actuated cast iron butterfly valve Product
EM-Flow is a leading industrial valve manufacturer from Taiwan, renowned for its high-quality products, advanced technology, and professional customer service. With many years of experience in valve manufacturing, EM-Flow has established its position in the international market, providing diverse valve solutions for various applications, from water treatment, chemicals, and oil and gas to food and beverages. EM-Flow’s philosophy is centered on research and development to continuously improve its products, ensuring they meet stringent technical standards and provide the highest value to customers. The EMEB-OSL electric butterfly valve is a clear testament to EM-Flow’s commitment to quality and innovation.
EM-Flow EMEB-OCW Electric Butterfly Valve
Technical Specifications:
Size: DN50 – DN600 (or larger upon request).
Working Pressure: PN10/PN16 (equivalent to 10/16 bar).
Working Temperature: -10°C to 120°C (depending on gasket and actuator material).
Connection Standard: Flange PN10/PN16 (ISO 5752 Series 20, API 609 Cat. A, BS EN 558 Series 20).
The EMEB-OSL electric butterfly valve is a flow control valve designed for either full opening/closing (On/Off) or flow regulation (Modulating), depending on the electric actuator equipped. The name “EMEB-OSL” contains key information about the product’s structure and function:
EMEB: Short for “EM-Flow Electric Butterfly,” confirming it is an EM-Flow brand electric butterfly valve.
OSL: Indicates the main material composition: O (Cast Iron Body), S (Stainless Steel Disc), L (EPDM Liner/Gasket).
The combination of a sturdy cast iron body and a corrosion-resistant stainless steel disc is an optimal choice, providing high economic efficiency while ensuring durability and operational performance.
Superior Construction and Material Features
1. Cast Iron Body
The cast iron body is a prominent feature of the EMEB-OSL. Cast iron is a common and preferred material in industrial valve manufacturing due to its outstanding advantages:
High Mechanical Strength: Cast iron has excellent compressive strength, allowing the valve to withstand high pressure in pipeline systems.
Corrosion Resistance: While not as perfect as stainless steel, cast iron still offers good corrosion resistance in many common water and chemical environments. With an external epoxy paint coating, the body’s corrosion resistance is significantly enhanced.
Reasonable Cost: Compared to full stainless steel materials, cast iron has a lower production cost, which helps reduce the product’s final price while maintaining quality.
Easy to Cast and Machine: Cast iron’s good casting properties allow for the easy production of complex shapes, ensuring the product’s accuracy and consistency.
With a cast iron body, the EMEB-OSL butterfly valve is suitable for applications with moderate pressure and temperature, especially in water supply and drainage systems, wastewater treatment, and other light industrial applications.
2. Stainless Steel Valve Disc
The stainless steel valve disc is the component in direct contact with the fluid and plays a crucial role in controlling flow. Using stainless steel for the disc offers many benefits:
Superior Corrosion Resistance: Stainless steel (typically SUS304 or SUS316) has excellent resistance to corrosion from many chemicals, water, and other liquids, even in harsh environments. This ensures the valve’s long lifespan and stable performance.
High Durability: Stainless steel has good tensile strength and hardness, allowing the valve disc to withstand the impact forces of fluid flow and opening/closing pressures without deformation.
Hygienic Properties: The smooth surface of stainless steel is less prone to fouling and is easy to clean, making it particularly suitable for applications requiring high sanitation standards, such as in the food, beverage, or pharmaceutical industries (depending on the specific stainless steel type and certification).
Reduced Friction: The smooth surface of stainless steel also helps reduce friction during operation, allowing the valve to operate more smoothly.
The combination of a cast iron body and a stainless steel disc creates a balanced material configuration that optimizes both cost and performance in many applications.
3. EPDM Sealing Gasket
The EPDM (Ethylene Propylene Diene Monomer) sealing gasket is a popular and effective choice for butterfly valves. EPDM offers several advantages:
Good Elasticity: EPDM has high elasticity, which helps the gasket create a perfect seal between the valve disc and the body, preventing fluid leakage.
Aging Resistance: EPDM has good resistance to ozone, UV rays, and weather conditions, extending the life of the gasket.
Temperature Resistance: EPDM can operate effectively within a wide temperature range, from approximately -40°C to 120°C, making it suitable for many industrial applications.
Chemical Resistance: EPDM has good resistance to hot water, steam, alkaline solutions, diluted acids, and some organic solvents. However, it’s important to note that EPDM does not resist oils and fuels well.
With an EPDM gasket, the EMEB-OSL butterfly valve ensures a complete seal, preventing fluid loss and protecting the environment.
4. Valve Shaft and Bushings
The valve shaft is typically made from stainless steel (e.g., SS410, SS304) to ensure durability, corrosion resistance, and efficient torque transmission from the actuator. Bushings, often made from self-lubricating materials like PTFE (Teflon) or polymer compounds, help reduce friction between the valve shaft and the body, ensuring smooth operation and extending the valve’s lifespan.
part of EMEB-OCW Electric butterfly valve
5. The EM-Actuator Electric Actuator: The Heart of Automation
The biggest difference between an electric butterfly valve and a manual lever or gear-operated valve is the integrated electric actuator. EM-Flow provides high-quality electric actuators, typically the EM-Actuator models, which are specifically designed to operate reliably and accurately with butterfly valves.
Common Types of Electric Actuators:
On/Off Actuator (Full Open/Close): This is the most basic type, allowing the valve to fully close or open when it receives an electrical signal. It is suitable for applications requiring quick and definitive flow shut-off.
Voltage: Common options include 24VDC/AC, 220VAC, 380VAC, suitable for various electrical systems.
Control Signal: Simple (e.g., 2 or 3 wires for power and control).
Modulating Actuator (Flow Regulation): This type is more complex, allowing the valve to open to various angles (e.g., from 0-90 degrees) to precisely regulate fluid flow.
Control Signal: Typically uses an analog signal like 4-20mA or 0-10V to proportionally control the valve position.
Functionality: Capable of position holding, providing current valve position feedback (analog output signal), and integrated PID control.
Applications: Crucial in systems that require precise control of flow, pressure, or temperature, such as in water treatment plants, large HVAC systems, or automated production lines.
Advantages of the EM-Actuator Electric Actuator:
Automated Operation: Eliminates the need for manual operation, saving labor and minimizing human error.
Precise Control: Especially with the modulating type, the valve can be controlled with high accuracy, optimizing the process.
System Integration: Easily integrates into automated control systems (PLC, DCS, SCADA) via standard electrical signals.
Safety: Reduces risks for operators when handling hazardous fluids or working in harsh environments.
Remote Monitoring: The valve’s status and position can be monitored remotely, enhancing system management capabilities.
Protection Features: Modern actuators often have built-in protection against overload, overheating, water, and dust (IP67), ensuring durable operation in industrial environments.
Position Memory (optional): Some actuators may have a function to remember the last position in case of a power failure, ensuring system safety.
Operating Principle of the Electric Butterfly Valve
When it receives an electrical signal from a controller (PLC, DCS, switch, etc.), the electric actuator generates torque to rotate the valve shaft. The valve disc, fixed to the shaft, rotates by a 90-degree angle (for On/Off) or to any angle (for Modulating) to open or close the pipeline.
When the valve is fully open (disc parallel to the flow), fluid passes through with minimal resistance.
When the valve is fully closed (disc perpendicular to the flow), fluid is blocked.
For modulating valves, the disc’s angle of rotation is adjusted proportionally to the control signal to achieve the desired flow rate.
Diverse Applications
With its outstanding material properties, construction, and automation capabilities, the EMEB-OSL cast iron body, stainless steel disc electric butterfly valve is widely used in many industries:
Water Supply & Drainage and Wastewater Treatment Systems: Controlling the flow of clean water, treated wastewater, and industrial wastewater. This is the most common application due to the good corrosion resistance of the stainless steel disc and the reasonable cost of the cast iron body.
HVAC (Heating, Ventilation, and Air Conditioning) Systems: Controlling the flow of chilled or hot water in cooling and heating systems for large buildings and commercial centers.
Light Chemical Industry: Controlling dilute, non-aggressive chemicals and neutral solutions.
Food and Beverage Industry: For applications that do not require the highest sanitary standards (e.g., beverages, beer), or in auxiliary processes not in direct contact with the final product. However, if high hygiene is required, a higher-grade stainless steel (e.g., SUS316L) and food safety certification should be considered.
Pulp and Paper Industry: Controlling the flow of water and dilute pulp.
Fire Protection Systems: The valve plays a crucial role in controlling water flow to areas that need fire suppression.
Power Plants: Controlling cooling water and water for auxiliary systems.
Mining Industry: Controlling the flow of dilute slurry and water during ore processing.
(EM-Flow Wafer-Type Electric Butterfly Valve with Cast Iron Body)
Benefits of Choosing the EMEB-OSL Electric Butterfly Valve
Investing in the EMEB-OSL cast iron body, stainless steel disc electric butterfly valve provides significant benefits for businesses:
High Operational Efficiency: Automation reduces errors, increases system response speed, and optimizes processes.
Reduced Operating Costs: Decreased labor, reduced fluid loss from leakage, and optimized energy consumption due to precise control capabilities.
High Durability and Long Lifespan: The combination of cast iron and stainless steel materials along with a high-quality EPDM gasket ensures the valve can withstand industrial environmental conditions, extending its service life.
Easy Installation and Maintenance: The compact design of the butterfly valve and the removable electric actuator make installation and maintenance simpler.
Safety and Reliability: Automated operation minimizes the risk of exposure to hazardous fluids. The protection features of the electric actuator enhance system reliability.
Flexibility: The choice between On/Off and Modulating functions, along with multiple voltage and control signal options, makes it suitable for various application requirements.
Excellent Technical Support: As an EM-Flow product, users can be confident in the technical support and after-sales service from the manufacturer and its distributors.
Conclusion: The EMEB-OSL cast iron body, stainless steel disc electric butterfly valve from EM-Flow is not just a fluid control device but also a crucial part of a comprehensive automation solution for industrial systems. With its perfect combination of durable materials, advanced electric actuator technology, and high reliability, this product meets the most stringent demands for performance, safety, and economic efficiency. Whether in water treatment plants, HVAC systems, or other industrial processes, the EMEB-OSL will undoubtedly provide lasting value and contribute to boosting your business’s operational productivity.
If you are looking for a reliable, efficient, and long-lasting electric butterfly valve solution, the EM-Flow EMEB-OSL is a top choice.
Contact Information:
VIVA INDUSTRIAL EQUIPMENT AND ENGINEERING., JSC
Apartment 20 – Building B – C30 Army Group Supplies Department, Ha Dinh Ward, Hanoi City, Vietnam .
I recently purchased and installed the EMEB-OCW electric butterfly valve for a small-scale industrial application, and my experience has been overwhelmingly positive. Having worked with various types of valves over the years, I can confidently say this model stands out for its performance, ease of use, and overall reliability.
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Mr. Dang Ha –
I recently purchased and installed the EMEB-OCW electric butterfly valve for a small-scale industrial application, and my experience has been overwhelmingly positive. Having worked with various types of valves over the years, I can confidently say this model stands out for its performance, ease of use, and overall reliability.