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Gate valves are primarily used for on/off control in pipelines. When fully open, they offer minimal resistance to fluid flow, making them ideal for applications requiring unrestricted fluid movement. However, they should not be used for throttling purposes, as this can lead to erosion and uneven wear.
The design of a gate valve features a wedge-shaped gate that moves up and down within the valve body. This movement allows or restricts flow. The sealing surfaces of a gate valve are flat or wedge-shaped, and they provide a tight seal when the valve is closed. This design reduces turbulence and minimizes pressure drop when fully open.
Commonly found in water supply systems, oil and gas industries, and power plants, gate valves are ideal for isolating sections of pipeline for maintenance or during emergencies. Their straightforward operation and robust design make them a preferred choice for high-pressure applications.
Globe valves are designed for throttling and flow control, functioning effectively in applications where precise regulation of flow is needed. Unlike gate valves, they provide better control over the flow rate and can maintain consistent pressure levels.
Globe valves feature a spherical body and a movable disk or plug. This disk is raised or lowered by a spindle within the valve to control the flow. The design allows for more effective sealing and reduces the chances of leakage, although it does create more resistance to flow than gate valves.
These valves are commonly used in steam, gas, and liquid services where flow regulation is crucial. Their ability to maintain flow at various levels makes them suitable for heating systems and chemical processing industries.
Choosing between gate and globe valves depends on the specific needs of the application. For applications requiring minimal resistance and straight-through flow, gate valves are preferred. Conversely, if precise control is necessary, globe valves are the better option. Understanding these differences can help engineers and technicians make informed decisions in valve selection.
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