What is the difference between butterfly valve and gate valve?

Butterfly valve and gate valve are common valve types, widely used in industrial and civil fields. Although they are both valves used to control the flow of media, they differ in structure, use occasions and control methods. These differences will be described in detail below.

1. Different structures

The structures of butterfly valves and gate valves are different. The butterfly valve is composed of a valve body, a valve seat, a valve stem, a disc, etc. The disc can rotate around the valve stem to achieve the switch control of the medium.

The gate valve is composed of a valve body, a valve disc, a valve stem, etc. The valve disc moves along the direction of the valve seat and controls the switch of the fluid by lifting and lowering. Therefore, there are obvious differences in the control methods and structures of the two.

2. Different applications

The butterfly valve and different use occasions are also different. The butterfly valve is suitable for medium flow control and cutoff, and is mainly used in upstream and downstream pipelines, water treatment, chemical industry and other fields. The characteristics of the butterfly valve are fast opening and closing speed, small starting torque, and suitable for occasions with large changes in medium flow.

The gate valve is mainly used to cut off and adjust the medium, and is suitable for pipeline systems with special media such as high temperature and high pressure, corrosive media, gas, steam, etc. The characteristics of the gate valve are good sealing, high temperature resistance, high pressure, and suitable for occasions where the flow rate does not change much.

3. Different control methods

The control methods of butterfly valves and gate valves are also different. Butterfly valves are usually controlled by manual, pneumatic or electric methods, among which the use of electric butterfly valves is becoming more and more common.

Gate valves are usually controlled by handwheels or motors. The advantage of electric control is that it can achieve automatic control and improve work efficiency and safety.

In short, although butterfly valves and gate valves are both valve types, they differ in structure, use occasions and control methods. In practical applications, it is necessary to select the appropriate valve type according to specific engineering requirements and medium characteristics. For example, for some occasions that require frequent operation, you can choose to use a butterfly valve, because the butterfly valve has a fast opening and closing speed and a small starting torque, which is easy to operate. For pipeline systems with high temperature, high pressure and special media, you need to choose a gate valve that is resistant to high temperature, high pressure and good sealing for control.