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Globe Valve vs Ball Valve

Views: 35     Author: Site Editor     Publish Time: 2023-01-31      Origin: Site

Globe valves and ball valves are both shut-off valves typically used in piping systems. However, it is usually not immediately obvious which valve is most suitable for an application. System design should be finished before valve selection in order to select the best valve for the job in terms of cost, installation space, flow control, and more. Keep reading to learn more about how a globe valve may be more suitable than a ball valve and vice versa.


For decades globe valves were considered the industry standard in control valves.  They are designed with a stem that moves up and down inside the valve to control flow.  They are commonly used on hot and chill water coils, and larger models are often used to control flow to chillers.  One of the main limitations of globe valves is that their close-off rating can be lower than other valves, especially in the larger sizes.


A globe valve is a multi-turn valve, meaning that the handwheel needs to be turned more than 360° to fully open or close the valve. The main components of a globe valve are the valve body, bonnet, handwheel, stem, and plug. Media flows into the valve body (Figure 2 labeled A) through an inlet and exits the valve body through an outlet. The bonnet (Figure 2 labeled B) protects the threaded components of the valve and attaches to the valve body. As the user turns the handwheel, it turns the threaded stem (Figure 2 labeled C), which raises or lowers the plug (Figure 2 labeled D). Raising the plug opens the orifice, thereby allowing media flow. Lowering the plug into the valve seat seals the orifice, preventing the flow. Raising the disc, on the other hand, increases the flow rate. The flow rate is maximum when the disc is raised to its maximum position. The fluid flow rate is controlled by moving the disc proportionally through the stem.


Ball valves are designed with a ball inside the valve.  The ball has a hole through the middle so that when the hole is in line with both ends of the valve, flow will occur.  When the valve is closed by turning the ball 90 degrees, the hole is perpendicular to the ends of the valve, and therefore flow is blocked.  Ball valves are very durable and usually have excellent shutoff even after years of use.  They are generally preferred over globe valves in shutoff applications.  The main limitation for ball valves is proportional control because of the large amount of flow that the ball allows.


A ball valve is a quarter-turn valve, meaning that the handle only needs a 90° turn to fully open or close the valve. The main components of a ball valve are shown in Figure 3. The stem (A) connects to the ball (B). The ball sits on the ball valve seat (C), creating the seal. O-ring stem seals (D) are used to prevent leakage. All of these components are within the valve housing (E). As seen in Figure 3, the ball has a bore running through it. Under normal operation, the bore is either aligned with the valve ports to allow flow, or perpendicular to the ports to block flow. Read our article on ball valves for more details on how they work.


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