Valve Globe

Globe valves are so-called because old-style globe valves had a globular shape. Some modern globe valves still resemble a globe shape, but many do not.  The four variations of globe valves are the standard globe valve, the angle globe valve, the “Y” globe valve, and the needle globe valve. Each one uses the same method of closure, using a disc or tapered plug-type disc that seats against a round opening (port).

Globe valves are used where throttling or frequent operation is desired. They remain a popular control valve, though ball valves are generally lower in cost and also work well for this purpose. Globe valve design deliberately restricts flow, so globe valves should not be used where full, unobstructed flow is required. They can be used as shut-off valves, but are more expensive and have a higher pressure loss compared to other types of shut-off valves. Thus, they typically are not used for this application.

A globe valve should be installed with the flow direction entering under the disc. The end of the valve through which one can see the disc seat when the valve is closed is the end the flow should enter. This is necessary for good throttling control of flow and for the best shutoff conditions. Globe valves should also be installed with the disc closed to prevent seat damage during installation.

Most globe valve leakage is due to foreign matter settling on the area between the disc and seat. When this occurs, it can often be corrected by opening the valve slightly and then closing it.

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