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Q347F
ZJFV/OEM
The nominal diameter (DN) of a ball valve is an important factor affecting flow selection, as it is directly related to the valve's flow capacity and the applicable pipeline size. The following are several specific criteria and considerations for the selection of flow rate based on the nominal diameter of ball valves:
1. * * Nominal diameter and flow coefficient (Kv value) * *: The rated flow coefficient (Kv value) of ball valves may vary depending on the nominal diameter (DN). For example, a DN25 ball valve may have a rated flow coefficient of 2.5, while a DN1040 ball valve may have a rated flow coefficient of 2045. This means that larger diameter ball valves can provide greater flow and are suitable for situations that require high flow.
2. * * Pipeline size and valve diameter * *: The size of the valve diameter is inevitably related to the size of the pipeline. Usually, pipelines are larger and valves are actually smaller, mainly depending on the flow rate that needs to be controlled by the valve position. The nominal diameter (DN) of a valve corresponds to the outer diameter of the pipeline, for example, a DN100 ball valve may correspond to a pipeline outer diameter of 114.3mm.
3. Flow capacity of valves: The flow capacity of ball valves depends on their nominal diameter and design. The aperture of a full bore ball valve is the same as the size of the pipeline, so it does not limit the flow rate and is suitable for situations where maximum flow is required. The aperture of a reduced diameter ball valve is smaller than that of a pipeline, which limits flow and generates higher pressure drop, making it suitable for applications that can tolerate slight pressure drops.
4. Pressure drop and flow rate of valve: When selecting a ball valve, the pressure drop and flow rate of the fluid passing through the valve should be considered. Large diameter ball valves typically have lower flow rates and pressure drops, while small diameter ball valves may have higher flow rates and pressure drops, which can affect flow selection and valve suitability.
5. Geometric structure of valves: The geometric structure of ball valves, including the design of the sphere and seat, also affects the flow coefficient. The flow coefficient of a ball valve is related to factors such as the flow state of the liquid and the geometric structure of the valve, and usually needs to be determined by experimental methods.
6. Material and sealing of valves: The material and sealing of ball valves can also affect their flow characteristics. For example, certain materials may be more suitable for high-pressure or high-temperature applications, and the choice of sealing material can affect the sealing performance and applicable medium of the valve.
7. * * Operation mode * *: The operation mode of the ball valve, such as manual, electric or pneumatic, can also affect the control and selection of flow rate. Automatic control ball valves can achieve more precise flow control and are suitable for situations that require fine adjustment of flow.
The nominal diameter (DN) of a ball valve is an important factor affecting flow selection, as it is directly related to the valve's flow capacity and the applicable pipeline size. The following are several specific criteria and considerations for the selection of flow rate based on the nominal diameter of ball valves:
1. * * Nominal diameter and flow coefficient (Kv value) * *: The rated flow coefficient (Kv value) of ball valves may vary depending on the nominal diameter (DN). For example, a DN25 ball valve may have a rated flow coefficient of 2.5, while a DN1040 ball valve may have a rated flow coefficient of 2045. This means that larger diameter ball valves can provide greater flow and are suitable for situations that require high flow.
2. * * Pipeline size and valve diameter * *: The size of the valve diameter is inevitably related to the size of the pipeline. Usually, pipelines are larger and valves are actually smaller, mainly depending on the flow rate that needs to be controlled by the valve position. The nominal diameter (DN) of a valve corresponds to the outer diameter of the pipeline, for example, a DN100 ball valve may correspond to a pipeline outer diameter of 114.3mm.
3. Flow capacity of valves: The flow capacity of ball valves depends on their nominal diameter and design. The aperture of a full bore ball valve is the same as the size of the pipeline, so it does not limit the flow rate and is suitable for situations where maximum flow is required. The aperture of a reduced diameter ball valve is smaller than that of a pipeline, which limits flow and generates higher pressure drop, making it suitable for applications that can tolerate slight pressure drops.
4. Pressure drop and flow rate of valve: When selecting a ball valve, the pressure drop and flow rate of the fluid passing through the valve should be considered. Large diameter ball valves typically have lower flow rates and pressure drops, while small diameter ball valves may have higher flow rates and pressure drops, which can affect flow selection and valve suitability.
5. Geometric structure of valves: The geometric structure of ball valves, including the design of the sphere and seat, also affects the flow coefficient. The flow coefficient of a ball valve is related to factors such as the flow state of the liquid and the geometric structure of the valve, and usually needs to be determined by experimental methods.
6. Material and sealing of valves: The material and sealing of ball valves can also affect their flow characteristics. For example, certain materials may be more suitable for high-pressure or high-temperature applications, and the choice of sealing material can affect the sealing performance and applicable medium of the valve.
7. * * Operation mode * *: The operation mode of the ball valve, such as manual, electric or pneumatic, can also affect the control and selection of flow rate. Automatic control ball valves can achieve more precise flow control and are suitable for situations that require fine adjustment of flow.
