Multi-turn valve structure features a detailed introduction - globe valve

2025-10-03 10:11:27
Shut-off valves, including angle shut-off valves, are widely used in various industrial applications due to their reliability and performance. These valves are particularly recommended for use as throttle valves because they offer precise control over fluid flow. One of the key advantages is the ability to achieve a true bubble-free shut-off when equipped with a resilient seat, ensuring minimal leakage and improved system efficiency. Additionally, they are well-suited for frequent operations, making them ideal for dynamic environments where regular on/off cycles are required. However, there are some drawbacks to consider. First, these valves can cause a significant pressure drop during operation, which may affect system performance in certain applications. Second, they tend to be more expensive compared to other valve types, such as gate or ball valves. This cost factor should be evaluated based on the specific needs of the system. In terms of disc and seat design, elastic (soft) seats are generally preferred for most applications due to their excellent sealing properties. However, in high-temperature piping systems, or when dealing with fluids that require high-precision throttling or contain abrasive materials, metal alloy seats are often a better choice. For example, PTFE is considered the best resilient material for most pipe systems, but rubber seats may offer greater flexibility in cold water environments. For plug-in disc and seat configurations, metallic alloys with high hardness are commonly used. These are especially suitable for applications requiring precise throttling, where the fluid temperature exceeds the Teflon limit (260°C), or where the medium contains abrasive particles. In cast iron stop valves, a semi-insert bronze disc and seat structure is typically used, offering a balance between durability and cost-effectiveness. Another important type is the automatic steam cut-off check valve, which is ideal for medium-pressure steam piping systems. The sliding action of the semi-plug-in disc allows it to function not only as a shut-off valve but also as a throttle and check valve, providing multiple functions in one unit. This makes it a versatile option in steam systems where space and functionality are critical considerations. Overall, shut-off and angle shut-off valves are valuable components in many piping systems, provided their advantages and limitations are properly understood and matched to the application requirements.

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