Large Diameter Manual Butterfly Valve is a simple and high-performance regulating valve, widely used in various industrial fields. Its structural features include:

Tightly structured: Utilizes mid-line butterfly plate and short structural steel plate welding design, featuring light weight, easy installation, low flow resistance, and high flow capacity, and is unaffected by high-temperature expansion, with smooth operation.

‌No Linkage and Bolts: Free of complex structures like rods and bolts, offering reliable performance and a long service life._

Bidirectional Sealing Feature: Unrestricted by medium flow direction during installation, can be mounted in any direction, featuring bidirectional sealing capability.

High-temperature and corrosion-resistant: Suitable for high-temperature and corrosive mediums, especially for high flow rates and low pressure differentials.

Application Scenario

Large diameter manual ventilation butterfly valves are widely used in low-pressure pipelines in industries such as building materials, metallurgy, mining, and power, on pipes with medium temperatures ≤300℃ and nominal pressure of 0.1MPa, for connecting, opening, or adjusting the flow of the medium. Additionally, they are suitable for dust-containing cold or hot air gas pipelines in ventilation and environmental protection projects in industries such as chemicals, power stations, and glass.

Pros and Cons

‌Advantages:

Quick opening and closing: Simply rotate 90 degrees for easy operation.

Low flow resistance: When fully open, the valve disc is flush with the inner wall of the pipeline, allowing fluid to pass with minimal resistance, resulting in low energy loss.

Simple structure: Compact, lightweight, and low material consumption, particularly suitable for large-diameter valves.

Wide Application Range: Suitable for mediums with suspended fixed particles, applicable for bidirectional opening and adjustment of ventilation and dust removal pipelines.

‌Disadvantages:

Flow adjustment range is limited: Once the switch is turned on to 30%, the flow will nearly reach over 95%.

Poor sealing performance: Less effective than globe valves and stop valves in terms of sealing, suitable for applications with lower sealing requirements.

Temperature and pressure limitations apply: Generally suitable for temperatures below 350°C and pressures below PN40.