When the system is full of water, the gas in the water continuously escapes and accumulates at the top due to changes in temperature and pressure. When the gas pressure is higher than the system pressure, the buoy will drop and drive the valve stem to move downward, the valve port is opened, and the gas is continuously discharged. When the gas pressure is lower than the system pressure, the buoy rises to drive the valve stem to move upward, and the valve port is closed. This is how the single orifice air release valve operates in a constant cycle.
When there is air in the system, the gas accumulates on the upper part of the air release valve, the gas in the valve accumulates, and the pressure rises. When the gas pressure is higher than the system pressure, the gas will make the water level in the cavity drop, and the float will drop with the water level, and the air release port will be opened. After the gas is exhausted, the water level rises, the buoy also rises, and the air release port is closed. If the bonnet on the valve body is tightened, the air release valve stops exhausting. Normally, the bonnet should be be opened. It can also be used in conjunction with the isolation valve to facilitate the maintenance of the exhaust valve.
The above content is the air release valve working principle.
The function of the single orifice air release valve is to release the gas when the pressure of the gas storage tank reaches a certain level, so as to ensure that the pressure of the gas storage tank will not be too high and cause danger. Generally, the outlet hole of the single orifice air release valve is blocked by the spring tension, and the spring tension can be adjusted according to the needs to achieve the required value of the gas storage tank.
The single orifice air release valve is installed in the water pipeline to remove the gas overflowing from the water. The smooth exhaust of the water pipeline is the most important indicator to ensure its safe operation. Engineering practice has proved that no exhaust valve or the performance of the exhaust valve does not meet the requirements, both may cause a pipe burst, resulting in economic loss. Therefore, using an exhaust valve with good exhaust performance and proper installation is the key to the safe operation of the pipeline.
During the operation of the HVAC system, many adverse effects caused by gases such as hydrogen and oxygen released by the water during heating will damage the system and reduce the thermal effect. If these gases cannot be discharged in time, there will be many adverse effects, such as corrosion caused by oxidation, the formation of air pockets in the radiator, the unbalanced and impeded circulation of hot water causing locally lukewarm on some radiators, the noise when the pipeline is running with air and the vortex of the circulating pump. Therefore, the exhaust gas in the system must be discharged in time, which shows the important role of using a single orifice air release valve.