What is a water butterfly valve?
Mia Morrison
Updated on March 07, 2026
What is a water butterfly valve?
Butterfly valves are a family of quarter-turn rotational motion valves that are used in pipelines to shut-off flow. The double offset or eccentricity refers to the fact that this valve design involves two offsets of the disc from the valve body’s centre or the axis of rotation of the stem.
What is an advantage of a butterfly valve?
Advantages of a Butterfly Valve The disc is lighter than a ball, and the valve requires less structural support than a ball valve of comparable diameter. Butterfly valves are very precise, which makes them advantageous in industrial applications. They are quite reliable and require very little maintenance.
What is the difference between a gate valve and a butterfly valve?
Butterfly valves The difference between this and a gate valve is in the way the gate operates within the valve. Unlike the gate valve, the gate within the butterfly valve remains fixed and swivels around an internal axis. The butterfly valve has the same function as the gate valve, which is allowing and blocking flow.
Do butterfly valves require gaskets?
Most butterfly valves do not require extra gaskets. All the butterfly valves available on pvcfittingsonline.com for example have built in seals that sit against your flanges and prevent leakage.
What are the advantages and disadvantages of butterfly valve?
Valve Type Pros and Cons
| Valve | Advantages | Disadvantages |
|---|---|---|
| Butterfly | Low pressure drop and high-pressure recovery | |
| High coefficient of flow | ||
| Ball | Superior ease of operation | Poor throttling characteristics |
| Maintains and regulates high volume, | Difficult to clean, leads to contamination |
What is the difference between ball valve and butterfly valve?
Flow regulation: Both valve types can be used for on/off control and proportional control, but ball valves are typically used for proportional due to better flow regulation. Ports: A butterfly valve can only have two ports, while a ball valve can have more than two ports.
How do you fix a leaking butterfly valve?
Leakage in the seat seal
- Check whether the valve is 100% sealed.
- Check whether the actuator closes at maximum torque, open/close the valve under pressure and increase torque.
- If valve continues to leak, replace seat seal.
How do I know if my butterfly valve is open or closed?
When the handle is parallel to the valve, it is closed, and when it is perpendicular to the valve, it is open. Butterfly valves are suited for use in garden irrigation, and they are also commonly used in space-restrictive applications.
Are butterfly valves cheaper than gate valves?
Cost: butterfly valves tend to be cheaper than gate valves. Size: butterfly valves are smaller and more compact. Generally, this allows them to be more versatile in their use than gate valves.
