globe valve can reduce the flow through the pipe
A Globe Valvee is formed by a baffle that splits the interior of the pipe, usually parallel to the length of the pipe. The baffle contains an opening that is sealed by means of a disc or flat plug being pushed down into the opening, or seat, perpendicular to the pipe, to stop the flow through the pipe. A structure called a bonnet outside the pipe holds a stem that is connected to the disc. A hand wheel at the top of the bonnet is used to manually screw down the stem with the disc at its end until the disc seals against the seat opening. In large industrial applications, a globe valve may be sealed using an electrical, pneumatic, or hydraulic actuator instead of a manual hand wheel.
These devices are sometimes referred to as throttle valves because they can reduce the flow through the pipe. If the sealing disc is moved part of the way toward the seat opening, the space through which the product can flow is limited and therefore the flow is limited. This type of valve offers good control to regulate the flow of liquid. Water pipes are often fitted with a globe valve so the operator can control the flow of water through the pipe by opening the valve only partially or all the way.
This Valves can also be set up to close with or against the flow of product. If the product flows in the same direction that the disc is closing, the flow will aid the closure of the seal but make opening harder. Conversely, if the flow goes against the direction of the disc closure, it will be easier to open the valve and more difficult to close it.
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