Working Principle
Open State: When the handle is rotated to the open position, the stem drives the ball to rotate, and the through - hole in the ball aligns with the pipeline, allowing fluid to flow through the valve with minimal resistance.
Closed State: When the handle is rotated to the closed position, the ball rotates to a position where it blocks the flow path of the fluid. The tight fit between the ball and the seat forms a seal, preventing the fluid from passing through.
Advantages
Good Corrosion Resistance: Due to the use of stainless - steel material, the valve has excellent corrosion resistance and can be used in corrosive media such as acid, alkali, and salt solutions without being easily corroded, thus prolonging the service life of the valve.
High Sealing Performance: The combination of the ball and the seat has a very high sealing performance, which can effectively prevent fluid leakage. Even under high - pressure conditions, it can maintain a good sealing effect, ensuring the safety and reliability of the fluid control system.
Low Flow Resistance: The internal structure of the valve is simple, and the flow passage is smooth. The spherical design of the ball enables the fluid to flow through the valve with little resistance, which helps to reduce energy consumption and pressure loss in the pipeline system.
Wide Range of Applications: It can be used in various fluid media, including water, oil, gas, and chemical fluids. It is widely used in petroleum, chemical, pharmaceutical, food, water treatment and other industries, as well as in some civil engineering and building water supply and drainage systems.
Disadvantages
Limited Temperature and Pressure Resistance: Although stainless steel has good mechanical properties, the temperature and pressure resistance of two - piece ball valves is still limited to a certain extent. In some extremely high - temperature and high - pressure environments, special materials and structures may be required to meet the working requirements.
Not Suitable for Fine - Tuning of Flow Rate: The ball valve is mainly used for on - off control of fluid. Due to its relatively large opening and closing range, it is not very suitable for fine - tuning the flow rate. If precise flow control is required, other types of valves such as regulating valves may be needed.
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