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As a commonly used valve, the ball valve is widely applied in various fluid pipeline systems due to its characteristics of rapid opening and closing, good sealing performance, and wear resistance. There are numerous types of ball valves, which can be classified according to different classification criteria. Below are some primary classification methods and their corresponding types of ball valves:
1. Classification by structural form
Floating ball valve: The ball is floating and forms a seal by contacting the valve seat. When the medium passes through the ball valve, the pressure of the medium pushes the ball towards the valve seat, making the ball tightly fit the valve seat and achieving a sealing effect.
Trunnion-mounted ball valve: The ball is fixed and maintains a certain gap with the valve seat. When the medium passes through the ball valve, the pressure of the medium does not change the position of the ball, but it changes the size of the flow passage, thereby controlling the flow rate of the fluid.
II. Classification by driving mode
Manual ball valve: A valve that is opened and closed manually, suitable for use in various fluid pipelines.
Electric ball valve: A valve that is opened and closed by electric power, suitable for automated control systems and remote control.
Pneumatic ball valve: A valve driven by compressed air for opening and closing, suitable for fluid control systems requiring rapid response and high precision.
III. Classification by sealing material
Soft-seal ball valve: The sealing material is soft materials such as rubber or polytetrafluoroethylene, suitable for fluid pipelines with high sealing requirements.
Hard seal ball valve: The sealing material is metallic, suitable for use in fluid pipelines under harsh conditions such as high temperature and high pressure.
IV. Classification by medium used
Ball valve for water: suitable for use in water pipelines for tap water, cooling water, hot water, and other aqueous media.
Steam ball valve: suitable for use in pipelines carrying high-temperature media such as steam and hot air.
Ball valve for gas: suitable for use in pipelines for gas media such as oxygen, nitrogen, and hydrogen.
Acid and alkali ball valve: suitable for use in pipelines carrying corrosive media such as strong acids and alkalis.
V. Classification by connection method
Flanged ball valve: connected via a flange, suitable for use in various fluid pipelines.
Wafer-type ball valve: It is connected via a wafer and is suitable for use in fluid pipelines with smaller diameters.
Threaded ball valve: connected via threads, suitable for use in small-diameter and low-pressure fluid pipelines.
Socket-and-spigot ball valve: It is connected via socket and spigot, and is suitable for use in fluid pipelines such as water supply and drainage pipelines.
Clamp-type ball valve: connected via clamps, suitable for use in small-diameter and low-pressure fluid pipelines.
Clamp-type ball valve: connected via a clamp, suitable for use in large-diameter fluid pipelines.
Double union ball valve: It is suitable for use in fluid pipelines with larger diameters through double union connections.
Pinch-type ball valve: connected via a pinch, suitable for use in large-diameter fluid pipelines.
Grooved ball valve: connected via grooves, suitable for fluid pipelines with larger diameters.
VI. Other classification methods
According to the channel type: it can be divided into full-bore, reduced-bore, double-reduced-bore, etc.
Based on valve function and application in industrial and mining environments, valves can be categorized into two-way ball valves (O-type ball valves), three-way and four-way directional flow ball valves (L-type three-way, T-type three-way, Y-type three-way), V-type regulating ball valves, insulated jacketed ball valves, eccentric semi-ball valves, and three-eccentric metal-sealed ball valves.
Based on the operating temperature, ball valves can be categorized into low-temperature ball valves, normal-temperature ball valves, high-temperature ball valves, etc.
In summary, there are numerous types of ball valves, and the selection process requires comprehensive consideration based on specific factors such as the application scenario, medium characteristics, and operational requirements.