Among many valve products, gate valves and butterfly valves are very common valve types. However, many users do not know what the difference between the gate valve and the butterfly valve when selecting the type, and do not know how to choose these two valves. In response to this problem, the STV valve will introduce the difference between the lower gate valve and the butterfly valve to facilitate the user’s better selection.
First distinguish by definition:
The gate valve is one of the most common on-off valves. It is connected (opened) by means of a shutter (ie, the opening and closing member, the opening and closing member in the gate is called a gate or gate, and the gate is called a gate seat). Truncate (fully close) the media in the pipeline. It is not allowed to be used as a shut-off. During use, the gate should be prevented from being opened slightly. The erosion of the medium flowing at high speed will accelerate the damage of the sealing surface. The ram is used as a lifting movement in the plane perpendicular to the center line of the gate seat passage, and cuts the medium in the pipeline like a gate, so it is called a gate valve.
The butterfly valve refers to a valve in which the closing member (valve or disc) is a disc, which is rotated around the valve shaft to open and close, and is mainly used for cutting and throttling on the pipeline. The butterfly valve opening and closing member is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting. The butterfly valve is normally less than 90° from full opening to full closing. The butterfly valve and the butterfly rod have no self-locking capability. For the positioning of the butterfly plate, a worm gear reducer is added to the valve stem. The use of a worm gear reducer not only enables the disc to have a self-locking capability, but also stops the disc at any position and improves the valve’s operating performance.
Secondly, from the action mode:
The gate valve is a straight-stroke valve, that is, the valve stem drives the valve plate to move up and down vertically, and the gate valve is opened and closed, so the flow resistance of the gate valve is small, but because of its high opening height, the opening and closing speed is slow.
The butterfly valve belongs to the angular stroke valve, that is, the valve plate of the butterfly valve rotates 90° around the valve shaft to complete the opening and closing action of the butterfly valve. Therefore, the butterfly valve opening height is only one quarter of the diameter of the channel, so the opening and closing is rapid.
According to the role and use of the gate valve and butterfly valve:
The gate valve has small flow resistance and good sealing performance. Because the valve plate and the medium flow direction of the gate valve are vertical angles, if the gate valve is not in place in the valve plate switch, the medium slams the valve plate to make the valve plate vibrate, which is easy to be sealed as a gate valve. Therefore, it is often used for pipes that require strict sealing and does not require frequent opening and closing, and is not suitable for adjusting the parameters of the pipe medium.
Due to the slower opening and closing speed, it is not suitable for emergency cutting. The gate valve has a wide range of operating conditions and can be used in high temperature, low temperature, high pressure, low pressure and other working conditions.
The butterfly valve not only has a cut-off effect, but also has an adjustment function. The butterfly valve opens and closes quickly, and can be frequently opened and closed. It is especially suitable for applications requiring quick opening or cutting. Compared with the gate valve, the butterfly valve has small size, light weight and low price. In some working conditions with limited installation space, the butterfly valve with clip-on connection can be selected to save space.