BLOG

Guidance on selection of various valves

Time of issue：

2021-07-26

The gate valve is used as a cut-off medium, and the whole flow is straight when it is fully opened. At this time, the pressure loss of the medium operation is small. Gate valves are usually suitable for working conditions that do not need to be opened and closed frequently, and keep the sensor plate fully open or fully closed. Not suitable for use as regulation or throttling. For high-speed flowing medium, the gate may cause vibration of the gate under the condition of partial opening, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the gate to suffer the erosion of the medium. From the structural form, the main difference is the form of the sealing element used. According to the form of sealing elements, gate valves are often divided into several different types, such as: wedge valve, parallel gate valve, parallel double gate valve, wedge double gate valve, etc. Commonly used forms are wedge type valve and parallel type gate valve.

Guidance on selection of various valves
Gate valve
The gate valve is used as a cut-off medium, and the whole flow is straight when it is fully opened. At this time, the pressure loss of the medium operation is small. Gate valves are usually suitable for working conditions that do not need to be opened and closed frequently, and keep the sensor plate fully open or fully closed. Not suitable for use as regulation or throttling. For high-speed flowing medium, the gate may cause vibration of the gate under the condition of partial opening, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the gate to suffer the erosion of the medium. From the structural form, the main difference is the form of the sealing element used. According to the form of sealing elements, gate valves are often divided into several different types, such as: wedge valve, parallel gate valve, parallel double gate valve, wedge double gate valve, etc. Commonly used forms are wedge type valve and parallel type gate valve.

Shut-off valve
The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off action, making this valve very suitable for the cut-off or adjustment and throttling of the medium. Once the valve disc of the shut-off valve is in the open condition, there is no longer contact between its valve seat and the sealing surface of the valve disc, and it has a very reliable cut-off action. This kind of valve is very suitable for cutting or adjusting and reducing the medium. Stream usage.
Once the shut-off valve is in the open state, there is no contact between its seat and the sealing surface of the disc, so its sealing surface is less mechanically worn, because most of the shut-off valve seats and discs are easier to repair or replace It is not necessary to remove the entire valve from the pipeline when sealing the components, which is very suitable for the occasion where the valve and the pipeline are welded together. The flow direction of the medium through this type of valve has changed, so the flow resistance of the stop valve is higher than that of other valves.

Back to list →