Using a ball valve partially open accelerates seal wear and generates vibration and noise, potentially leading to valve failure over time.
1. Seal Wear: When the ball valve is partially open, the seat sealing material (such as PTFE) is subjected to high-speed fluid erosion, causing localized increased wear. When fully open, the fluid flows evenly, extending seal life by 3-5 times.
2. Vibration and Cavitation: When the valve is partially open, fluid flowing through the partially open orifice of the ball creates turbulence, causing vibration in the piping system. In liquid media, cavitation may occur, directly damaging the surface finish of the ball.
3. Control Accuracy Issues: The flow characteristic curve of a ball valve is non-linear in the 10%-30% opening range, making precise flow control difficult. For regulating applications, V-type ball valves or gate valves should be used.
