Ball valve is a common type of valve, widely used in various industrial fields. Understanding the working principle of the ball valve helps us to better grasp its performance characteristics and provide guidance for practical applications. This article will give you a detailed explanation of the working principle of the ball valve, so that you have an in-depth understanding of the ball valve.
First, the structural characteristics of the ball valve
Ball valve is mainly composed of valve body, ball, valve stem, sealing ring and other components. Among them, the ball is the key part of the ball valve, and its working state determines the opening and closing of the valve. Ball valve has simple structure, easy operation and good sealing performance, which is the main reason for its wide application.
Second, the working principle of the ball valve
1. Start the process
(1) The operator drives the valve stem to rotate through the valve stem so that the thread on the valve stem is connected or disconnected from the thread of the ball.
(2) When the valve stem rotates, the ball rotates accordingly. When the ball is rotated to the position communicated with the valve inlet and outlet channels, the medium can flow freely.
(3) When the ball is rotated to the position isolated from the valve inlet and outlet channels, the medium cannot flow to achieve the closure of the valve.
2. Close the process
In contrast to the opening process, the operator drives the rotation of the valve stem through the valve stem so that the threads on the valve stem are connected or disconnected from the threads of the sphere, and the sphere rotates accordingly. When the ball is rotated to a position isolated from the valve inlet and outlet channels, the medium cannot flow to achieve the closure of the valve.
Three, ball valve sealing performance
The sealing performance of the ball valve mainly depends on its sealing structure and sealing material. Ball valve seal structure is divided into soft seal and metal seal two kinds.
1. Soft seal: The sealing ring of the soft seal ball valve is usually made of fluorine rubber, polytetrafluoroethylene and other materials with good corrosion resistance and wear resistance. When the valve is closed, a sealing interface is formed between the ball and the sealing ring to prevent the leakage of the medium.
2. Metal seal: The sealing performance of metal sealed ball valve mainly depends on the tight fit between the ball and the seat. When the valve is closed, a gap-free sealing interface is formed between the ball and the seat to achieve sealing. The sealing performance of the metal sealed ball valve is better, but the corrosion resistance is relatively poor.
Four, the operation of the ball valve
The operation mode of the ball valve is manual, electric, pneumatic and so on. The choice of operation mode should be based on the actual working conditions and operating requirements.
1. Manual operation: Manual operation of the ball valve requires the operator to directly rotate the valve stem, drive the ball to rotate, and realize the opening and closing of the valve. The manually operated ball valve is suitable for occasions where the medium flow is small and the operating frequency is low.
2. Electric operation: The electric operation ball valve drives the valve stem to rotate through the electric actuator to realize the rotation of the ball, so as to realize the opening and closing of the valve. Electrically operated ball valve is suitable for remote control and high degree of automation.
3. Pneumatic operation: pneumatic operation ball valve through the pneumatic actuator to drive the valve stem rotation, to achieve the rotation of the ball, so as to achieve the opening and closing of the valve. Pneumatic ball valve is suitable for medium temperature is higher, more dangerous occasions.
V. Conclusion
The working principle and sealing performance of ball valves make them widely used in industrial fields. Understanding the working principle of the ball valve helps us to better grasp its performance characteristics and provide guidance for practical applications. I hope this article can help you to understand the ball valve in depth.
Post time: Aug-25-2023
