Analysis of Working Principle and Basic Structure of (Globe Valve)

Analysis of Working Principle and Basic Structure of (Globe Valve)

(Globe valve), also known as a shut-off valve, is a commonly used valve. Its working principle mainly uses the lifting of the valve stem to drive the valve head, thereby changing the distance between the valve disc and the valve seat, and achieving the purpose of controlling fluid flow.

The basic structure of a globe valve includes the following main parts:

1. Valve body: It is the main body of a globe valve, used to connect pipelines, and contains channels for fluid to pass through.

2. Valve cover: located at the upper part of the valve body, usually connected to the valve body, used to support the valve stem and provide sealing.

3. Valve stem: It is the operating part of a globe valve, which controls the opening and closing of the valve by rising or falling.

4. Disc: Connected to the valve stem, it contacts or separates from the valve seat by moving up and down, thereby achieving sealing or opening the channel.

5. Valve seat: Located inside the valve body, it is a key part that cooperates with the valve disc to achieve sealing.

6. Sealing surface: The surface used for sealing on the valve disc and seat, usually requiring precision machining to ensure good sealing effect.

7. Handwheel: Installed at the top of the valve stem, used for manually operating the opening and closing of the valve.

The advantages of a globe valve include:

1. Good sealing performance: Due to the low friction between the valve disc and the valve body sealing surface, it is relatively wear-resistant.

2. Easy manufacturing and maintenance: Usually, there is only one sealing surface on the valve body and disc, which has good manufacturing process and is easy to repair.

3. Small opening height: Compared with other types of valves, (globe valve) has a smaller opening height.

However, there are also some drawbacks to (globe valves):

1. High fluid resistance: Due to the shape of the internal channel, the fluid resistance of the shut-off valve is relatively high.

2. Not suitable for media with high viscosity or easy crystallization: In actual production, it is mainly used for controlling pipelines such as water, steam, and compressed air, but it is not suitable for materials with high viscosity or easy crystallization.

3. Longer structural length: Compared with other types of valves, (globe valve) has a longer structural length.

In summary, when selecting and using (globe valves), it is necessary to determine whether they are suitable for use based on the actual working conditions and medium characteristics, and pay attention to their installation direction and maintenance to ensure the normal operation of the valve and extend its service life.