Butterfly Valves
Unyazi supplies industrial butterfly valves for reliable isolation and general flow control across a wide range of process and utility systems. Their compact design, low weight and simple quarter-turn operation make them particularly suitable for large-diameter pipelines where installation space, cost and ease of maintenance are important.
Our range includes wafer, lugged and double-flanged butterfly valves for water, gases, air and selected dry bulk applications.
How Butterfly Valves Work?
A butterfly valve controls flow using a circular disc mounted inside the valve body. Rotating the disc by 90 degrees moves the valve between its open and closed positions. When fully open, the disc remains within the flow path while allowing media to pass through the valve. Its simple construction provides quick operation and allows butterfly valves to be installed in systems where larger or heavier valve designs may not be practical.
Butterfly valves are mainly used for isolation and general flow control. Where accurate throttling is required, the valve design and operating conditions should be assessed carefully.
Key Benefits
Compact Design
Butterfly valves require less installation space than many other valve types. This makes them practical for crowded pipework and large-diameter systems.
Lightweight Construction
Their lower weight can reduce the load placed on pipework and supporting structures. It can also simplify handling and installation.
Fast Quarter-Turn Operation
When correctly selected, ball valves provide a tight and reliable seal. This helps reduce leakage and maintain safe operating conditions.
Low Pressure Drop
A streamlined internal design helps limit resistance as media moves through the valve. This can support efficient system operation when the valve is fully open.
Simple Installation and Maintenance
Butterfly valves have fewer internal components than many alternative designs. This can make installation, inspection and routine maintenance more straightforward.
Manual Or Automated Control
Butterfly valves can be operated using a lever or gearbox. They can also be fitted with pneumatic, electric or hydraulic actuators for remote operation.
Wafer Butterfly Valves
Wafer butterfly valves are installed between two pipe flanges and held in position using flange bolts. Their compact design makes them a cost-effective choice for many general industrial and utility applications.
Lugged Butterfly Valves
Lugged valves have threaded inserts around the valve body, allowing each side of the pipeline to be bolted separately. This can make it possible to disconnect one side of the system without removing the complete valve installation.
Double-Flanged Butterfly Valves
Double-flanged butterfly valves include a flange on both sides of the valve body. They are commonly selected for larger pipelines and installations where additional connection strength and alignment support are required.
The correct configuration will depend on the pipe diameter, pressure, installation arrangement and maintenance requirements.
Where Butterfly Valves are Used?
Butterfly valves are commonly used in large pipework systems where dependable isolation is needed without adding unnecessary weight or complexity. Their compact construction also makes them useful in plants where space is limited or where large-diameter valves must be installed and maintained efficiently.
Cooling water circuitsWater treatment systemsUtility pipelinesGas servicesSelected dry bulk handling systemsAir handling systems
Selecting and Operating the Correct Butterfly Valve
Butterfly valves are commonly used in large pipework systems where dependable isolation is needed without adding unnecessary weight or complexity.
Typical applications include cooling water circuits, water treatment systems, air handling systems, utility pipelines, gas services and selected dry bulk handling systems.
Their compact construction also makes them useful in plants where space is limited or where large-diameter valves must be installed and maintained efficiently.
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