What is the working principle of Y-type Globe valve
The Y-type globe valve is the most widely used valve. Its popularity stems from its low friction between the sealing surfaces during opening and closing, its durability, low opening height, ease of manufacture, and convenient maintenance. It is suitable for both low and medium pressures, as well as high pressures. Its closing mechanism relies on stem pressure to force the disc sealing surface into close contact with the seat, preventing the flow of media. Globe valves only allow unidirectional flow and are directional during installation. Globe valves are longer than gate valves and exhibit greater fluid resistance, resulting in less reliable sealing over extended periods.
Core Features and Advantages of Y-Type Globe Valves
- Low Flow Resistance Design
The Y-shaped valve body minimizes disruption to the flow state of the medium, reducing flow resistance by 30%-50% compared to straight-through globe valves and significantly reducing pressure drop. For example, in steam systems, using a Y-type globe valve can reduce system energy consumption by 5%-10%.
- High Sealing Performance
Line Seal: The disc and seat sealing surfaces utilize a tapered line contact, ensuring reliable sealing and leak rates below API standards.
Wear-Resistant Coating: A wear-resistant coating (such as tungsten carbide) can be applied to the valve body and disc surface to reduce erosion of the valve trim and extend service life.
- Erosion Resistance and Long Life
The Y-shaped flow path design reduces direct erosion of the sealing surface, preventing impurities from being trapped and reducing the risk of wear. In applications with solid-particle media (such as slurries and muds), service life is extended by 2-3 times compared to straight-through globe valves.
- Convenient Operation and Fast Opening and Closing
The valve stem has a short lifting stroke, enabling fast opening and closing speeds (a 90° rotation allows for full opening or closing), saving effort. For example, a DN100 valve can be opened and closed in just 2-3 seconds, significantly faster than a gate valve's 10-15 seconds.
