The product was last updated on 06/10/2025 at 04:14 pm
EM-Flow EMPB-OSF pneumatic flanged butterfly valve: A technological breakthrough from Taiwan
In the context of modern industrialization, the selection of piping equipment goes beyond mere on/off functionality, demanding precision, durability, and high integration capabilities. The
EM-Flow EMPB-OSF pneumatic flanged butterfly valve, a flagship product from the reputable EM-Flow brand in Taiwan, has established itself as an optimal solution for industrial piping systems. With a perfect combination of high-quality materials, advanced design, and reliable control, the EMPB-OSF valve has become a top choice in industries that require high precision and safety, such as petrochemical, oil and gas, and general industrial applications.

Construction and detailed technical specifications
The EMPB-OSF pneumatic flanged butterfly valve is engineered with a robust structure and high-quality components, ensuring stable and reliable operation in various environments.
Valve body and disc
The body and disc are core components, made entirely of high-quality stainless steel (
Inox SUS304 or SUS316). They are cast as a single, seamless block, creating a strong structure without material defects, which provides superior durability and rigidity. The cast material’s surface is highly smooth, which helps prevent dirt from accumulating and makes cleaning easy after use.

Sealing gasket
To ensure optimal sealing and effectively prevent leaks, the valve is equipped with a high-quality sealing gasket. The gasket is designed to completely seal the valve body and comes with various material options like
EPDM, NBR, and PTFE. These materials offer excellent resistance to corrosion and abrasion, making them compatible with various media. A specific material option recognized by the
FDA allows the valve to be used in the food industry, where high standards of hygiene and safety are required.
Connection type and position indicator
The valve uses a common flanged connection type, which makes installation into piping systems easy and secure. The flange is cast as one piece with the stainless steel valve body and is manufactured according to popular standards like
JIS and BS. Additionally, the valve is equipped with a clear indicator on top, which allows the operator to easily and visually determine the exact open/closed status of the valve.
Pneumatic actuator (Cylinder)
The actuator is the heart of the pneumatic butterfly valve, helping to perform flow on/off operations quickly, accurately, and reliably. The control cylinder uses an opposed
dual-piston structure made of cast aluminum alloy, providing powerful thrust/pull force and reliable operation. The cylinder housing is made of anodized aluminum alloy, optimally designed to protect the internal components from external environmental impacts. The actuator shaft is treated with electrolytic nickel plating, which effectively protects it from corrosion and oxidation.
Outstanding advantages and practical applications
The reason the EMPB-OSF pneumatic butterfly valve is an ideal choice for industrial piping systems lies not only in its construction and technical specifications but also in its superior benefits.

Proven quality and high durability
EM-Flow is a long-standing, reputable brand from Taiwan, specializing in automatic control equipment. Their products, including the EMPB-OSF valve, are known for their exceptional quality and durability, providing peace of mind and reliability for users. The valve has a very high operational lifespan, up to
1,000,000 cycles of opening and closing. This significantly extends its service life, reduces the frequency of maintenance or replacement, and thus optimizes long-term operating costs.
Automatic control capability and compatibility
The EMPB-OSF butterfly valve is designed according to international standards, making it easy to integrate and compatible with other automatic control devices such as solenoid valves or limit switch boxes for remote status monitoring. This design allows for precise, flexible, and convenient operation, control, and monitoring of the valve. Thanks to its corrosion-resistant, heat-resistant, and pressure-resistant materials, the valve is suitable for working with various media (liquids, gases, etc.), effectively meeting the needs of diverse industries.
Fast and decisive On/Off operation
The valve has a fast response time, allowing it to perform flow on or off operations almost instantly upon receiving a control signal. This is particularly effective in applications that require quick reactions and immediate flow control.
Conclusion: The EM-Flow EMPB-OSF flanged pneumatic butterfly valve is a comprehensive and effective solution for industrial piping systems. The combination of durable materials, a standardized design, and precise control has created a product that not only meets but also exceeds the stringent requirements of the modern industrial environment. Investing in the EMPB-OSF valve is not just choosing a piece of equipment; it’s choosing a long-lasting, reliable solution that helps optimize performance and reduce operating costs for a business.
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Mr. Nguyen –
We purchased the EM-Flow EMPB-OSF flanged butterfly valve for a high-pressure water distribution line in our municipal system. The primary reason we chose this model was the flanged connection, which provides a much more robust and secure seal than other valve types we’ve used in the past. The installation was straightforward, with the flanges providing perfect alignment and a leak-proof connection from the first bolt. The pneumatic actuator is incredibly reliable and provides a quick, decisive on/off action. We haven’t experienced a single operational failure or leak since it was installed three months ago. The Taiwan origin is evident in the quality of the castings and the smooth operation of the disc.