A shut-off valve is a type of valve that uses a closure element, often referred to as a disc or plug, which moves along the centerline of the seat. The opening and closing action of the valve causes a proportional change in the size of the seat opening, depending on how the disc moves. Due to its short stem travel and reliable sealing capability, this design is particularly well-suited for flow control applications. Because the valve’s opening is directly proportional to the movement of the disc, it provides accurate regulation of flow, making it ideal for both shutoff and throttling functions.
When selecting a globe valve, consider the following principles:
1. Use a shut-off valve in high-temperature and high-pressure environments, such as in power plants, nuclear facilities, and petrochemical systems where the media is extreme.
2. It is suitable for pipelines where pressure drop is not a critical factor, meaning it can be used in areas where minimal resistance is acceptable.
3. Small-sized shut-off valves are commonly used with needle valves, instrument valves, sampling valves, and pressure gauge valves, especially in instrumentation and monitoring systems.
4. For applications requiring flow or pressure adjustment, but where precision is not essential, and the pipe diameter is relatively small (e.g., nominal diameter ≤ 50mm), a shut-off valve is an appropriate choice.
5. In chemical production, especially in fertilizer manufacturing, high-pressure angle shut-off valves are recommended for pipelines with nominal pressures up to PN160 (16MPa) or PN320 (32MPa).
6. In environments like desiliconization workshops or pipelines prone to coking—such as those in the Bayer process for alumina production—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, such as water supply and heating systems, shut-off valves, balancing valves, or plunger valves can be used for smaller pipelines, typically with a nominal diameter less than 150mm.
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