What is the Difference between Ball Valve and Butterfly Valve?
If you have learnt the introductions of ball valves and butterfly valves earlier in our blog, you will have a basic knowledge about them. Now we can take a look at the differences between these two types of valves.
The differences between ball valves and butterfly valves can be distinguished from the following aspects:
1.Different structure of ball valve and butterfly valve
In terms of the structure, the biggest difference between them is the opening and closing parts. The opening and closing parts of the butterfly valve are a plate, while the opening and closing parts of the ball valve are a ball. The flow of the butterfly valve can be adjusted through the opening degree, but the ball valve can not be adjusted.
Butterfly valve is composed of four parts: valve body, valve seat, valve plate and valve rod. Its accessories are exposed and can be seen by eyes. While ball valve is composed of valve body, valve core (a round ball) and valve rod. The valve core is in the valve body and only some parts of it can be seen by eyes.
2.Different tightness and caliber of ball valve and butterfly valve
The characteristics of the butterfly valve are fast opening and closing speed, simple structure and low cost, but the tightness and pressure capacity are not good. The ball valve can quickly open and close, and can achieve complete sealing under high pressure and temperature. So in comparison, the sealing performance of the ball valve is better than that of the butterfly valve. However, due to the limitation of volume and opening and closing resistance, the ball valve is difficult to achieve a large diameter, and the structural principle of the butterfly valve is particularly suitable for making large diameter valves.
3.Different temperature and withstand voltage of ball valve and butterfly valve
From the point of view of service temperature, due to the sealing material and structure, ball valve is not suitable for steam medium, while butterfly valve can be used for conventional saturated steam medium for heating (below 350 ℃).
The structure of butterfly valve is relatively simple, and butterfly valve is generally used for low pressure, while the structure of ball valve is relatively complex, more resistant to high pressure.
4.Different Operating torque of ball valve and butterfly valve
In terms of operating torque, the butterfly valve is a three eccentric metal seal butterfly valve, so its opening and closing torque is very small. With the increase of the diameter of the ball valve, the contact area of the sealing surface also increases squarely, so the opening and closing torque of the large diameter ball valve will be very large.
