Butterfly valves are a type of quarter-turn rotation valve. They are mostly used to start, stop, or control the flow. Butterfly valves have a disk that is attached to a rod. The word “butterfly” refers to this disk. The butterfly valve opens or closes when this rod turns the disk 90°. Butterfly valves are famous in business because they are affordable, simple to use, and don’t weigh much. Based on the need, these valves can be operated by handles, gears, or electric motors.
Butterfly valve Parts can start, stop, and change the flow of fluid. They rotate every quarter of a turn. A lot of people choose them because they are easy to use. Here are the parts of a butterfly valve and what they do to make the valve work.
- Body
The butterfly valve’s body goes between the two lines. This thin valve has two main body styles: wafer and lug. The wafer-style body costs less than the other one. Bolt holes pass through the valve’s body and connect it to the lines.
- Disk
In both wafer-style and lug-style butterfly valves, there is a disk inside. This disk controls the media flow through the valve, much like a gate or a ball valve.
The valve disc can be either centered or not centered. It is the circular ring that is the easiest of these two styles. The steam flows through the disk’s center in a circular shape. In low-pressure situations, concentrator valves are often used.
- Stem
It might look like a small part, but the base of the butterfly valve is very important. The stem links the handle to the disk on the inside. What’s a valve if it can’t open or close? The valve would not be able to work without it.
- Seat
The butterfly valve’s seat is made of different elastic materials or plastics and is either fixed to the body or pushed or locked down. The seat goes around the inside of the valve—the disk and seat close when pressed together, stopping the flow.
- How Does the Butterfly Valve Work?
The operation resembles a ball valve, facilitating a quick cessation of flow. Butterfly valves are typically preferred over other valve designs due to their lower cost and lighter weight, reducing the required support. The disc is situated at the pipe’s midpoint.A rod transits the disc to reach an actuator on the valve’s external. The actuator rotates the disc parallel to or perpendicular to the flow. In contrast to a ball valve, the disc always remains in the flow, thereby creating a pressure decrease even when in an open position.Butterfly valves are a class of the quarter-turn valve family. The disc undergoes a quarter-turn operation to open or close the valve completely. The “butterfly” is a disc of metal affixed to a rod. Rotating the disc when the valve is closed entirely obstructs the passageway.A quarter turn is applied to the disc when the valve is completely ajar, facilitating an almost unimpeded fluid flow. Flow can also be reduced by gradually opening the valve.Various butterfly valves are designed for a specific pressure and application. The zero-offset butterfly valve, characterized by its elastomer flexibility, possesses the most minimal pressure rating. Utilized in systems with marginally higher pressures, the high-performance double-offset butterfly valve is offset by one degree from the centerline of the disc seat and body seal and two degrees from the bore’s centerline.The seat is lifted from the seal by generating a cam action during operation, reducing friction and a diminished propensity for wear compared to the zero offset design. In high-pressure systems, the triple-offset butterfly valve is the optimal component.By offsetting this valve’s disc seat contact axis, sliding contact between the disc and seat is effectively eliminated. Triple offset valve seats are constructed from metal to enable machining to produce a seal that prevents the passage of air bubbles when the seat comes into contact with the disc.
- What Are the Advantages of Butterfly Valve?
Butterfly valves offer numerous benefits in comparison to alternative valve varieties.
- Sufficiently sustained by the piping system; lightweight.
- Fewer primary materials and reduced expenses.
- Compact design with minimal spatial demands.
- Rapid operation; reduced time required for opening and closing.
- Installation is simple.
- Low operation torque reduces the complexity of the operation.
- Extensively available in large capacities
- An increase in energy efficiency
- High-pressure recovery and low-pressure decline
- Features excellent lifespan
