Floating ball valve is a type of valve widely used in pipeline systems, mainly used to control the flow of fluids (such as liquids, gases or steam). Its core component is a rotatable ball, which is rotated to open or close the flow channel, thereby realizing the on-off or flow regulation of the fluid.
1. Working principle of floating ball valve
Ball structure: The ball of the floating ball valve is not fixed in the valve body, but supported by the upper and lower valve stems, and is allowed to float slightly under the action of fluid pressure.
Sealing mechanism
When the valve is closed, the ball is pushed to the downstream valve seat under the action of fluid pressure to form a tight seal.
This floating design enables the ball to automatically compensate for valve seat wear or manufacturing errors, ensuring long-term and reliable sealing performance.
Operation mode: The valve stem is driven to rotate by a handle, worm gear, pneumatic or electric actuator, driving the ball to rotate 90° to open or close the valve.
2. Main features of floating ball valve
Simple structure: compact design, few parts, easy to manufacture and maintain.
Reliable sealing: The floating ball can automatically adapt to the valve seat to ensure the sealing effect, especially suitable for low or medium pressure conditions.
Easy operation: Full opening or closing can be completed by rotating 90°, and the operating torque is small.
Wide range of applications: It can be used for a variety of media such as water, oil, and gas, and is widely used in petroleum, chemical, electric power, water supply and drainage, etc.
3. Advantages and disadvantages of floating ball valves
Advantages
The price is relatively low and cost-effective.
Excellent sealing performance, especially suitable for occasions that require frequent opening and closing.
Easy installation and simple maintenance.
Disadvantages
Due to the floating ball, the fluid pressure will directly act on the valve stem, resulting in greater force on the valve stem, which may affect the service life.
Not suitable for high pressure or high temperature conditions, because high pressure may cause the ball to float unstably and affect the sealing effect.
4. The difference between floating ball valve and fixed ball valve
Features Floating ball valve Fixed ball valve
Ball fixing method The ball can float and is pushed by fluid pressure The ball is fixed and the valve stem bears pressure
Sealing performance Automatic compensation for valve seat wear, reliable sealing Spring or medium pressure auxiliary sealing is required
Applicable pressure Low pressure, medium pressure High pressure, ultra-high pressure
Structural complexity Simple Complex
Price Low High
5. Application scenarios of floating ball valve
Oil and gas industry: used for cutting and regulating oil pipelines and natural gas pipelines.
Chemical industry: control the flow of corrosive media.
Water treatment industry: used for switch control of water supply and drainage pipelines.
Food and pharmaceutical industry: meet sanitary requirements and control fluid flow.
6. Precautions for selecting floating ball valves
Pressure and temperature: select the appropriate pressure grade and material according to the working conditions to ensure that the valve can still work normally under high temperature or high pressure.
Medium characteristics: consider the corrosiveness, viscosity and particle content of the medium, and select appropriate sealing materials and ball materials.
Operation mode: Choose manual, pneumatic, electric or hydraulic actuators according to actual needs.
Connection method: Common connection methods include flange connection, threaded connection and welding connection, which need to be selected according to the pipeline system.
