The role of the intake and exhaust valves during the water filling process is equivalent to that of a gatekeeper, and their specific advantages are also very obvious. Yuan Mei Water Conservation will lead everyone to explore it. When the pipe is filled with water, the air inside the pipe needs to be discharged. When the water inlet valve is closed, due to the self-weight of water, the intake and exhaust valves will continue to flow downward, creating a vacuum in the pipeline and posing a significant threat to the safety of the pipeline.

Therefore, the intake and exhaust valves should be set correctly to ensure the normal and safe operation of the pipeline. The intake and exhaust valves are generally located at the beginning of the pipeline system arranged along the slope, and at the end of the pipeline arranged on the reverse slope, in the protruding part of the pipeline. The main function of the intake and exhaust valves is to form negative pressure in the pipeline section where the pipeline bends downward along the water flow direction and the slope is greater than 10 degrees, and it is easy to form negative pressure through the hydraulic calculation of the pipeline network.

The intake and exhaust valves are selected as JP3Q-H /G ball valve type inlet and outlet valves. When water is filled in the pipeline, the air inside the pipeline needs to be discharged. When the inlet valve is closed, due to the self-weight of the water flow, it continues to flow downward, forming a vacuum inside the pipeline, which poses a great threat to the safety of the pipeline. Therefore, it is necessary to appropriately set the intake and exhaust valves to ensure the normal and safe operation of the pipeline. Intake and exhaust valves are generally installed at the beginning of the pipeline system with a clockwise slope, at the end of the pipeline with a counterclockwise slope, at the protruding part of the pipeline, at the slope where the pipeline bends downward towards the water flow direction and the slope change exceeds 10°, as well as in the pipe sections where negative pressure is likely to form through the hydraulic calculation of the pipeline network.

The intake and exhaust valves have been in operation for many years without proper maintenance and have suffered severe corrosion, which can easily lead to pipeline leakage. Therefore, it is necessary to inspect and repair the existing air intake and exhaust valves and gradually replace them with advanced and reliable electric high-speed air intake and exhaust valves to enhance the safety and reliability of the urban water supply network operation.

Due to the function of the internal float ball, the common intake and exhaust valve has the function of exhausting air when water is entering and inhaling air when water is draining. However, in actual use, although the valve body is equipped with a protective tube to resist the impact of high-speed airflow, high-speed disturbed airflow will be generated inside the valve body under high-speed exhaust conditions. Under this influence, the aerodynamic force of the float ball is greater than its weight, and the float ball will be blown out by the high-speed airflow, blocking the opening of the exhaust valve, resulting in a large amount of air remaining in the pipeline and the exhaust function being unable to be exerted.

The high-speed power inflow exhaust valve adopts a special float ball. When the high-speed airflow passes through the float ball, there is a significant change on the rear surface of the float ball. Therefore, the upper layer of the float ball surface generally develops unstably, resulting in float ball separation and the formation of a vortex wake behind the object. At this time, the pressure difference resistance on the object is very large, the flow area of the airflow behind the float ball increases, and the flow velocity decreases. According to Bernoulli's equation, the airflow undergoes a process of deceleration and expansion behind the sub-zone. In this way, due to the pressure difference between the upper and lower parts of the sub-zone, the sub-zone will not be blown away by the high-speed airflow but will float inside the valve.