Characteristics and classification of globe

Characteristics and classification of globe valves

Globe valves are shutoff pieces (discs) that move along the center line of the seat. The globe valve is mainly used for cutting off in pipelines. Globe valves have the following advantages:

1. In the process of opening and closing the sealing surface friction is smaller than the gate valve, wear - resistant.

2. Small opening height.

3. Usually only one sealing surface, good manufacturing technology, easy to maintain.

Globe valves are commonly used, but due to the large opening and closing torque and long structural length, the general nominal diameter is limited to DN less than 200mm. The fluid resistance loss of the globe valve is large. This limits the wider use of globe valves.

There are many types of globe valves, which can be divided according to the position of the thread on the stem:

1. Upper thread stem stop valve

Globe valve stem threads are on the outside of the valve body. Its advantage is that the valve stem is not subject to medium erosion, easy to lubrication, this kind of structure is widely used.

2. Lower thread stem stop valve

Globe valve stem threads in body. This design allows stem threads to be in direct contact with the medium, subject to erosion and unlubricated. This structure is used in small diameter and low temperature applications.

According to the channel direction of the globe valve, it can be divided into; Straight - through globe valve, Angle globe valve and three - way globe valve, the latter two kinds of globe valves are usually used to change the flow of medium and distribution medium.


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