Exhaust valves are used in independent heating systems, central heating systems, heating boilers, central air conditioners, floor heating and solar heating systems and other pipeline exhaust. Because there is usually a certain amount of air dissolved in water, and the solubility of air decreases with the increase of temperature, the gas gradually separates from the water in the process of water circulation, and gradually gathers together to form large bubbles or even air columns. Because of the supplement of water, gas is often generated. Exhaust valves include air conditioning exhaust valves, solar exhaust valves, heating exhaust valves, and boiler exhaust valves.
The working principle of the exhaust valve:
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, and the exhaust valve is generally installed at the highest point of the system. When gas enters the exhaust valve cavity and gathers at the upper part of the exhaust valve, as the gas in the valve increases, the pressure rises. When the gas pressure is greater than the system pressure, the gas will drop the water level in the cavity, and the float will drop along with the water level and open exhaust vent. After the gas is exhausted, the water level rises, and the float rises accordingly, closing the exhaust port. In the same way, when negative pressure is generated in the system, the water level in the valve cavity drops and the exhaust port opens. Because the outside 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 bonnet on the valve body of the exhaust valve is tightened, the exhaust valve stops exhausting. Normally, the bonnet should be in an open state.
Installation points of the exhaust valve:
1. The exhaust valve must be installed vertically, that is, the internal float must be in a vertical state, so as not to affect the exhaust;
2. When installing the exhaust valve, it is best to install it together with the blocking valve, so that when the exhaust valve needs to be removed for maintenance, the system can be sealed and water will not flow out;
3. The exhaust valve is generally installed at the highest point of the system, which helps to improve the exhaust efficiency.