Globe Valves

The globe valves are used to control the fluid flow rather than having a limited capability of only “stopping” or “blocking” the flow. Let’s discuss these concepts in a bit more detail.

Stopping or Blocking of Flow

Valves which provide this type of service are known as block valves. The main purpose of such valves is to completely stop the flow and ensure nothing leaks by. Gate valves are commonly used for this purpose.

Regulating or Throttling of Flow

Let’s say a liquid flows through a pipe and flow rate can range from 0 gpm to 1000 gpm. Let’s assume we want to be able to control the flow rate through the entire range. This means that we want the valve to be operated in midway positions. In this case the valve opening can range from fully closed to fully open, and all of the intermediate positions. For example, one intermediate position will result in 50 gpm, and another will result in 650 gpm, and so on. A valve which can control the flow to any intermediate position is said to have a “throttling" capability.

Throttling Action

This indicates a situation where a valve is partially open, resulting in the desired flow rate. This type of duty is very hard on the valve control elements. For example if a gate valve is used for this service, you will notice that it will show a high erosion damage or it will get bent out of shape. Globe valves are designed to provide this service without any problems.