The basic principle of exhaust valves

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. 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 increases with the increase of gas in the valve. When the gas pressure is greater than the system pressure, the gas will cause the water level in the chamber to drop, and the float will drop with the water level, opening the exhaust port; After the gas is exhausted, the water level rises and the float also rises, closing the exhaust port. Similarly, when negative pressure is generated in the system, the water level in the valve chamber drops and the exhaust port opens. As the external atmospheric pressure is greater 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 and the exhaust valve stops discharging, the valve cap should usually be in an open state. The exhaust valve can also be used in conjunction with the isolation valve to facilitate the maintenance of the exhaust valve.