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First, the function of the ball valve balance hole

The balance hole is also called the compensation hole, which refers to a channel inside the ball valve, generally located between the two sealing surfaces above and below the ball. Its role is to balance the pressure on both sides when adjusting the pressure outside the section to ensure the normal operation of the valve. The balance hole of the ball valve is generally designed as a small hole, by adjusting the size and number of the balance hole, you can achieve the control of the pressure and flow of the ball valve, and improve the flow regulation performance of the ball valve.
Two, ball valve balance hole design principles
1. Number of balance holes: The number of balance holes of different types of ball valves is different. In general, the through ball valve has only one balance hole, and the rotary ball valve has multiple balance holes, because the ball of the rotary ball valve needs multiple sealing surfaces in the direction of flow.
2. Balance hole size: under normal circumstances, the diameter of the ball valve balance hole does not exceed 1/3 of the ball valve diameter, otherwise it will affect the flow regulation.
3. Balance hole position: the balance hole position of the ball valve is generally between the upper and lower ends of the ball, if the working conditions of the ball valve are more complex, you can also set balance holes on both sides of the ball.
Three, how to choose the right ball valve balance hole
1. Specific application scenarios: The number and size of the ball valve balance hole should be determined according to the specific application scenario, taking into account the nature and flow of the fluid to ensure the normal operation of the valve.
2. Pressure and flow requirements: Select the right balance hole size and number, can make the ball valve pressure and flow regulation more accurate, improve its flow regulation performance.
3. Maintenance: The design of the ball valve balance hole should take into account the convenience of maintenance and avoid additional operation and maintenance costs caused by the difficult maintenance of the balance hole location.
In short, the function and design principle of the ball valve balance hole is very important, and the selection of the right ball valve balance hole can effectively improve the flow regulation performance of the ball valve and ensure its normal work. When purchasing ball valves, you need to choose the appropriate ball valve model and valve design according to the specific application scenario, pressure and flow requirements and other factors.