Utmost Flow Control Technology Co., Ltd.
Utmost Flow Control Technology Co., Ltd.

What Is a Globe Valve?

The axis of the stem of the globe valve is perpendicular to the sealing surface of the valve seat. The stem has a relatively short opening or closing stroke and a very reliable cut-off action, making it suitable for media shut-off, regulation, and throttling. Once the globe valve valve disc is in the open position, its sealing surface with the valve seat is no longer in contact, and it has a very reliable cut-off action.

The globe valve, also known as the gate valve, is one of the most widely used types of valves. It is popular due to its low friction between the sealing surfaces during the opening and closing process, durability, low opening height, ease of manufacture, and ease of maintenance. It is suitable for both low and high pressures. Contact Utmost globe valve manufacturer for more information.

Working principle of globe valve

The stem of the globe valve generally rotates and lifts, and the handwheel is fixed at the top of the stem. When the handwheel is rotated clockwise, the stem thread descends, and the sealing surface of the valve disc and the valve seat sealing surface are tightly in contact, and the globe valve reaches the closed state. When the handwheel is rotated counterclockwise, the stem thread rises, and the sealing surface of the valve disc and the valve seat sealing surface are separated, and the globe valve is opened.

Once the globe valve is in the open state, there is no longer any contact between its valve seat and valve disc sealing surfaces, so its sealing surface has less mechanical wear and tear. Since most globe valve valve seats and valve discs are relatively easy to repair or replace sealing components, the entire valve does not need to be removed from the pipeline, making it ideal for situations where the valve and the pipeline are welded into one. The flow direction of the medium through this type of valve changes, so the flow resistance of the globe valve is higher than that of other valves.

Advantages of globe valve

  • Compared with a gate valve, the structure of the globe valve is relatively simple, usually with only one sealing surface on the valve body and valve disc, with a small sealing surface area, saving valuable materials, with low costs, and good manufacturing processability, which makes it easy to repair.

  • The sealing surface has light wear and scratches, and the sealing performance is good. When opening and closing, there is no relative sliding between the valve disc and the sealing surface of the valve body (except for the conical sealing surface), so the wear and scratches are not severe, the sealing performance is good, and the service life is long.

  • The opening height is small, usually only 1/4 of the diameter of the valve seat channel, with a compact structure and saving installation space.

Common types of globe valves

Angle globe valve

In the angle globe valve, the fluid only needs to change direction once, so the pressure drop through this valve is smaller than that of a conventional globe valve.

Straight-through globe valve

In the straight-through or Y-shaped globe valve, the flow channel of the valve body is on a diagonal line with the main flow channel, so the degree of flow disturbance is smaller than that of a conventional globe valve, and the pressure loss through the valve is correspondingly small.

Plug-type globe valve

This type of globe valve is a common type of globe valve. In this valve, the valve disc and valve seat are usually designed based on the plug principle. The valve disc is polished into a plug connected to the stem, and the seal is achieved by two elastic sealing rings fitted on the plug. The two elastic sealing rings are separated by one sleeve and pressed firmly around the plug by the load applied to the valve cover nut. The elastic sealing ring can be replaced and made from a variety of materials. This valve is mainly used for "on" or "off", but with a specially designed plug or a special sleeve, it can also be used for flow regulation.

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