Working Principle
• Open State: When the valve handle is rotated to the open position, the ball - shaped disc rotates accordingly, and the through - hole in the ball aligns with the pipeline, allowing the fluid to flow through the valve with minimal resistance.
• Closed State: When the valve handle is turned to the closed position, the ball rotates to block the flow path of the fluid. The tight fit between the ball and the valve seat forms a seal, preventing the fluid from passing through.
Advantages
• Good Sealing Performance: The contact between the ball and the valve seat is very tight, which can achieve a high - level sealing effect, effectively preventing fluid leakage. This is crucial in applications where fluid tightness is required.
• Low Flow Resistance: Due to the smooth inner passage of the ball valve and the streamlined design, the fluid can flow through the valve with little resistance, which helps to reduce energy consumption and pressure loss in the pipeline system.
• Quick Opening and Closing: The rotation of the ball - shaped disc is very flexible, and the valve can be opened and closed quickly, which is convenient for quickly controlling the fluid flow in the pipeline.
• Wide Range of Applications: It can be used in various fluids, including water, oil, gas, and some corrosive media. With different materials and coatings, it can adapt to different working environments and fluid characteristics.
Disadvantages
• Limited Pressure and Temperature Resistance: Compared with some other types of valves, the pressure and temperature resistance of screwed one - piece ball valves may be limited. In high - pressure and high - temperature applications, special materials and designs are often required.
• Not Suitable for Fine - Tuning: The ball valve is mainly used for on - off control of fluid. It is not very suitable for fine - tuning the flow rate due to its relatively large opening and closing range.
The screwed one - piece ball valve is a reliable and efficient valve type, widely used in industrial and civil fluid control systems. Its simple structure, good sealing performance, and low flow resistance make it an ideal choice for many applications.
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