The exhaust volume of the air vent valve should be large. After the empty pipe of the pipeline is filled with water, the exhaust can quickly return to the normal water supply capacity in a short time.
When the air vent valve has negative pressure on the pipeline, the piston should be opened quickly to quickly suck in a large amount of external air so that the pipeline will not be damaged due to negative pressure. Under working pressure, it can be assembled in pipes to exhaust air.
The air vent valve should have a relatively high closing pressure. In a short time before the piston is closed, the air in the pipeline must be discharged to improve the conveying efficiency.
The water filling pressure of the air vent valve should not exceed 0.02Mpa. The air vent valve is closed due to low water pressure, which can avoid a large amount of water spraying.
The air vent valve should use a stainless steel float (float) as an opening and closing object.
The cylinder in the air vent valve body is equipped with an anti-vibration protection device. After exhaust, a large amount of high-speed water directly impacts the buoy to prevent premature damage to the buoy.
The air vent valve adopts a separate structure, which is composed of a large number of air vent valves and automatic air vent valves to meet the requirements of pipeline pressure. The automatic air vent valve adopts a compound lever mechanism, which can greatly expand the buoyancy of the secondary ball, the end water level is low, the impurities in the water are not easy to contact the sealing surface, the exhaust hole is not blocked, and the performance is greatly improved. At the same time, under high pressure conditions, due to the remaining power of the compound lever, the float can drop at the same time as the water level, and the opening and closing parts are not absorbed by the high pressure like traditional valves and discharged normally.
In the case of large flow and the pump is frequently started, it is necessary to install a buffer cock on the air vent valve to alleviate the flow impact. The buffer cock should prevent a large amount of water injection without affecting a large amount of exhaust, so that the water supply efficiency is not affected, and effectively prevent the occurrence of water hammer.
