Why are the valve core and valve cage of steam cage valves designed to be relatively large?

I have used quite a few sleeves for steam valves – do they tend to get stuck?

Steam pipes are mostly made of carbon steel, which accumulates a lot of dirt. It gets stuck in the sleeve easily.

Flow regulation requirements: Steam systems typically require a wide range of flow regulation capabilities to meet the demands under different operating conditions. Due to its structural characteristics, the cage valve possesses a high flow capacity and good flow regulation performance, which is why it is widely used in steam systems. To meet the requirements for flow regulation, the valve core and valve cage need to be designed to be larger in order to ensure a sufficient flow area. Resistance to high temperature and pressure: Steam systems often need to operate in high-temperature and high-pressure environments, which requires valves to have good resistance to such conditions. Larger valve cores and valve cages can provide a greater heat dissipation area, reducing the temperature inside the valve and thereby enhancing its performance under high temperatures and pressures. Preventing clogging: There may be some impurities or particles in the steam system, which can accumulate inside the valves and cause them to clog. Larger valve cores and valve cages can reduce the likelihood of impurity accumulation, thereby lowering the risk of valve blockage. However, despite the many advantages of cage valves in steam systems, they are also prone to sticking. This may be due to the following reasons: Dust and blockages: Dust and impurities in the steam system can easily accumulate inside the valves, causing them to stick. Especially when the valve core and valve cage are large, more dust and impurities may accumulate, increasing the risk of the valve sticking. Wear and corrosion: Valves in steam systems often operate in high-temperature and high-pressure environments, and prolonged use can lead to wear and corrosion of the valve components. Wear and corrosion can increase the clearance between valve components, leading to valve sticking. Improper installation and maintenance: The installation and maintenance of valves are crucial for their proper operation. If it is not installed properly or maintained in a timely manner, it may cause the internal components of the valve to become misaligned or damaged, resulting in the valve sticking. To reduce sticking of cage valves in steam systems, the following measures can be taken: Regular cleaning: Clean the valves periodically to remove dust and impurities from their interior and keep them clean. Regular inspection and maintenance: Periodically inspect and maintain the valves to promptly identify and address any wear or corrosion issues within them, ensuring their proper operation. Proper installation: When installing the valve, it should be installed in accordance with the valve’s instructions to ensure proper alignment of its internal components. Choose high-quality valves: Select valves that are of high quality and highly reliable to reduce the risk of valve jamming.