A shut-off valve is a type of valve that uses a closure element, such as a disk or plug, to control the flow of fluid through a pipeline. The movement of this closure element is typically along the centerline of the valve seat, and the degree of opening or closing is directly related to the position of the valve stem. Because of its short stroke and reliable sealing performance, it is particularly well-suited for applications requiring precise flow regulation. The proportional relationship between the valve’s opening and the movement of the closure makes it ideal for throttling and flow control tasks. As a result, shut-off valves are commonly used for both on/off control and flow adjustment. When selecting a globe valve, several key principles should be considered: 1. Shut-off valves are suitable for high-temperature and high-pressure systems, such as those found in power plants, nuclear facilities, and petrochemical pipelines. These environments demand strong sealing and durability. 2. They are also appropriate for pipelines where pressure drop is not a critical factor, making them ideal for applications where flow resistance is less of a concern. 3. Smaller-sized shut-off valves are often used in conjunction with other components like needle valves, instrument valves, sampling valves, and pressure gauge valves, especially in instrumentation and monitoring systems. 4. When flow or pressure regulation is needed but high precision is not required, and the pipe diameter is relatively small (typically ≤ 50mm), a shut-off valve is an excellent choice. 5. In industrial production, especially in chemical fertilizer manufacturing, high-pressure angle shut-off valves with nominal pressures up to PN160 (16MPa) or PN320 (32MPa) are recommended for handling extreme conditions. 6. In specific environments such as desiliconization workshops or in the Bayer process for alumina production, where coking is a common issue, DC-type shut-off valves with removable seats and carbide alloy seals are preferred for their durability and ease of maintenance. 7. In urban infrastructure projects like water supply and heating systems, shut-off valves, balancing valves, or plunger valves can be used in smaller-diameter pipelines, typically with a nominal size of less than 150mm. For more information on vertical valve finishing: [http://?465.html](http://?465.html)
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