A globe valve controls or stops liquid or gas flow through a pipe with a disc or plug closing the seat. It can handle flow in either direction and can be sealed using an actuator. It restricts flow and offers good control. It can close with or against product flow and causes a pressure drop past the valve. It is unsuitable for thicker substances.
A globe valve is a mechanism used to control or stop the flow of liquid or gas through a pipe. The seat of a globe valve is in the center and parallel to the tube, and the opening in the seat is closed with a disc or plug. Globe valves can be designed to handle flow in either direction.
A globe valve is formed by a baffle that divides the inside of the pipe, usually parallel to the length of the pipe. The baffle contains an opening which is sealed by a disc or flat plug which is pushed down into the opening, or seat, perpendicular to the tube, to stop flow through the tube. A structure called a hood on the outside of the tube contains a stem connected to the disc. A hand wheel at the top of the hood is used to manually screw the stem with the disc at its end until the disc closes against the seat opening. In large industrial applications, a globe valve can be sealed using an electric, pneumatic or hydraulic actuator instead of a handwheel.
These devices are sometimes referred to as butterfly valves because they can reduce the flow through the pipe. If the sealing disc is moved partially towards the seat opening, the space through which the product can flow is restricted and therefore the flow is restricted. This type of valve offers good control to regulate the flow of liquid. Water pipes are often equipped with a globe valve so that the operator can control the flow of water through the pipe by opening the valve only partially or fully.
This valve can also be arranged to close with or against the product flow. If the product flows in the same direction that the disc closes, the flow will help the seal close but make it more difficult to open. Conversely, if the flow goes against the closing direction of the disc, it will be easier to open the valve and more difficult to close it.
The baffle inside a globe valve causes the product to divert its direction to move through the baffle. This angled movement means that the product cannot flow freely and causes a pressure drop past the valve. Globe valves are generally unsuitable for slurries or thicker substances which may be impeded by the baffle.
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