Automatic exhaust valve is widely used in HVAC engineering, hot water engineering, fire protection engineering, floor heating and air conditioning pressure vessel, automatic discharge of gas, prevent water overflow, to ensure pipeline safety.

The exhaust valve means that when there is gas overflow in the system, the gas will climb up the pipeline and eventually gather at the highest point of the system, while the exhaust valve is generally installed at the highest point of the system. When the gas enters the exhaust valve chamber and gathers at the upper part of the exhaust valve, the pressure will rise with the increase of gas in the valve, and when the gas pressure is greater than the system pressure, the gas will make the water surface in the chamber drop. Float down with the water level, open the exhaust port; After the gas is exhausted, the water level rises, the buoy rises with it, and the exhaust port is closed. In the same way, when negative pressure is generated in the system, the water surface in the valve chamber drops, and the exhaust port opens, because the external atmospheric pressure is larger than the system pressure at this time, the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure. If the valve cap on the exhaust valve body is tightened, the exhaust valve stops venting. Normally, the valve cap should be in the open state. The single-port exhaust valve can also be used with the block valve to facilitate the maintenance of the exhaust valve.

When water is injected into the pipe, the plug head of the exhaust valve stays in the open position and carries out a large amount of exhaust. When the air is discharged, water accumulates in the exhaust valve and the float is floated, and the plug head is driven to the closed position to stop a large amount of exhaust. When the water in the pipe is normally transported, if a small amount of air accumulates in the valve to a certain extent, the water level in the exhaust valve drops and the float drops accordingly, at this time, the air is discharged through the small hole. When the pump stops, the water flow in the pipe is empty or the negative pressure is generated in the pipe, the plug head is quickly opened and the air is inhaled to ensure that the pipeline is complete.

Sometimes there will be gas in the pipeline, or there will be gas overflow in the system, especially at the beginning of operation, which is air. After the water comes, the gas will be squeezed out, and the gas will climb up the pipeline and eventually gather at the highest point of the system. While the exhaust valve is generally installed at the highest point of the system, when the gas enters the exhaust valve chamber, it gathers at the upper part of the exhaust valve. When the pressure rises, when the gas pressure is greater than the system pressure, the gas will make the water surface in the chamber drop, the buoy will drop with the water level, and the exhaust port will be opened; After the gas is exhausted, the water level rises, the buoy rises with it, and the exhaust port is closed. In the same way, when negative pressure is generated in the system, the water surface in the valve chamber drops, and the exhaust port opens, because the external atmospheric pressure is larger than the system pressure at this time, the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure. If the valve cap on the exhaust valve body is tightened, the exhaust valve stops venting. Normally, the valve cap should be in the open state. The exhaust valve can also be used with the block valve to facilitate the maintenance of the exhaust valve.