What is Manual Wafer Type Centerline Butterfly Valve
Structural Features
Centerline Design: The valve stem axis coincides with the center of the butterfly plate. The butterfly plate rotates 90° within the valve body, ensuring even stress on the sealing surface and stable sealing performance.
Clamp-on Connection: The valve body has no flanges at either end and is directly clamped between two pipe flanges using bolts. This compact structure saves space and is suitable for narrow pipe layouts.
Handle Operation: A handle is used as the drive device, making operation simple and effortless. No additional power source is required, making it suitable for scenarios requiring manual control.
Performance Advantages
**Rapid Opening and Closing:** The butterfly plate only needs to rotate 90° to achieve full opening or closing, resulting in short action time and improved production efficiency.
**Superior Sealing Performance:** Utilizing elastic sealing rings (such as rubber or PTFE), reliable sealing is achieved, realizing bidirectional sealing with zero leakage. Suitable for various media including gases and liquids.
**Strong Corrosion Resistance:** The valve body and disc are often made of stainless steel or corrosion-resistant materials. The sealing materials are resistant to aging and mild corrosion, making them suitable for handling various media, including corrosive media.
Excellent Regulating Performance: Flow characteristics are nearly linear, exhibiting excellent regulating performance, suitable for regulating fluid flow and pressure.
Long Service Life: Capable of tens of thousands of opening and closing tests, ensuring long-term stable operation.
Small and Lightweight: Simple and compact structure, lightweight, easy to disassemble and maintain, and can be installed in any location, saving space.
Application Areas
Industrial Fluid Control: For conveying steam, oil, and corrosive media in industries such as petroleum, chemical, and metallurgy.
Water Treatment Systems: Flow regulation and shut-off of water supply and drainage pipelines.
Power and Thermal Power Plants: Flow control of cooling water systems and steam pipelines.
Special Operating Requirements: Low-temperature media (e.g., liquefied natural gas pipelines, requiring low-temperature resistant rubber seals), food and pharmaceutical (hygienic design to avoid media residue contamination).
Technical Parameters and Selection Considerations
Nominal Diameter: DN50～DN800, can be matched according to the pipe's inner diameter to avoid excessive flow velocity leading to wear or noise.
Nominal Pressure: PN0.6～PN1.6MPa, rated pressure must be ≥ 1.5 times the pipeline working pressure.
Sealing Material: Selected according to media characteristics, such as neoprene rubber, nitrile rubber, PTFE, etc., with temperature resistance ranging from -40℃ to 232℃.
Valve Body Material: Cast iron is suitable for low-pressure, normal-temperature conditions; carbon steel is suitable for medium- and high-pressure conditions; stainless steel is suitable for corrosive media conditions.
Actuation Method: Supports manual, worm gear, pneumatic, and electric actuation, and can be connected to automated control systems.
Maintenance Recommendations
Daily Inspection: Regularly inspect the appearance of the butterfly valve, including the valve body, valve stem, and actuator, cleaning surface dust, oil, rust, and other contaminants. Check the connecting bolts and nuts between the valve and the pipeline for looseness, damage, or missing parts; tighten or replace them promptly if necessary.
Regular Maintenance: Lubricate valve stem nuts, gears, and other transmission components to reduce friction; check the lubricating oil level in the electric actuator and replenish or replace it as needed; regularly replace seals (such as O-rings and packing) to prevent aging and leakage.
Common Troubleshooting:
External leakage at the valve packing: Replace the packing or tighten the gland bolts.
Leakage at the sealing surface: Adjust the electric actuator screws, clean the sealing surface of dirt, and repair any damage.
Electric actuator malfunction: Check the power supply, control signal, and motor; replace damaged parts.
Excessive opening and closing torque: Check if the butterfly plate is stuck, lubricate the transmission components, and adjust the actuator parameters.
Manual Wafer Type Centerline Butterfly Valve in stock
