What is The Different Between Butterfly Valve and Ball Valve?
What’s The Different Between Butterfly Valve and Ball Valve？
Both butterfly valves and ball valves are quarter turn (90 degree angle from full open to full close). Rotary valve series also includes conical valve and plug valve. They are used to control the flow of most types of gases or liquids at various temperatures and pressures. Butterfly valve and ball valve are popular for their relatively low cost, long service life and reliability. However, there are some differences that can help users choose between the two.
Butterfly valve: butterfly valve is a disc mounted on a rotating shaft. When completely shut down, the disk will completely block the circuit. When fully opened, the disc is at right angles to the air or liquid flow. The advantage of a butterfly valve is that it is relatively cheap to manufacture and maintain. They are the most common valves in large capacity water supply systems such as urban waterworks. They can be used for dirty liquid applications such as sewage or river water control. When the butterfly valve is fully opened, the butterfly disc is still in the flow line of the valve, so there is always a pressure drop on the butterfly valve. In addition, if the differential pressure on the butterfly valve is large, it may be difficult to open the valve. Some applications require a bypass valve to reduce the pressure differential before large butterfly valves can operate.
Ball valve: a ball valve (in short) is a ball with a hole. Turning the valve will position the hole as blocked, partially blocked, or complete the line through the valve. The advantages of ball valves include good sealing or almost no leakage when the valve is fully closed. No matter how the pressure of the ball valve will rotate. If the hole through the valve is as large or large as the inner diameter of the supply pipe, there is basically no pressure drop or resistance when the ball valve is fully opened. Ball valves are usually used in high pressure liquid or gas piping, usually 6 inches or less in diameter. In this case, complete shutoff is important.
Difference: butterfly valves are cheaper and lighter than other types of valves. Butterfly valve for large diameter pipeline is much smaller than ball valve, which means that the sealing performance of butterfly valve is not as complete as ball valve, and it is rarely used to control gas flow. Ball valves provide a reliable seal. In high pressure applications, the ball valve will provide superior shut-off characteristics, as well as no difficult rotation or the need for a pressure balance scheme.
