Sometimes there is gas in the pipeline, or there is gas Check Valve overflow in the system, especially in the early stage of operation, when air and water enter, the gas will be squeezed out, the gas will rise along the pipeline, and finally gather at the highest point of the system, and the exhaust The valve is generally installed at the highest point of the system. When the gas enters the valve cavity of the exhaust valve, it will accumulate on the upper part of the exhaust valve. When the pressure is higher than the system pressure, as the gas in the valve increases, the gas makes the water level of the valve cavity drop, and the float drops with the water level to open the exhaust port. When the gas is exhausted, the water level will rise and the float will rise, closing the vent. The exhaust valve float is made of low-density polypropylene material, which will not deform even if it is immersed in high temperature water for a long time. There is no difficulty in moving the buoy. The buoy lever is made of hard plastic, and the connection between the lever and the buoy and the support adopts a movable connection, which will not be corroded during long-term operation, causing the system to fail to work and leak water. When the water pump is started, when the valve body is not full of water, the floating ball in the valve body falls due to its own weight.

The stomata are in an open state. As the working lift of the water pump increases, the pipe is filled with water, and the air valve can automatically remove the air in the discharge pipe. When the valve body starts to fill with water, the float ball floats. The air in the pipe and the valve body is completely removed, and the valve body is filled with water; if the pressure in the pipe is higher than the atmospheric pressure, the floating ball will block the exhaust hole under the pressure in the pipe, and the water in the pipe will not be discharged out of the valve. During the operation of the pump, if the air dissolved in the water separates out and accumulates in the exhaust valve body, the floating ball loses its buoyancy and falls automatically. If the air volume is small, the float of the small pores will fall to exhaust; if the air volume is large, the float of the large pores will fall to exhaust.

The drop of the float ball reaches the time when the pressure of the water pressure in the pipe balances with the weight of the float ball. After the exhaust is completed, the float returns to the position where the air hole is closed. After the pump is stopped in an accident, when the pressure in the pipe drops to form a negative pressure, although the valve body is full of water, because the pressure in the valve is lower than the atmospheric pressure, the floating ball falls under the action of the difference between the atmospheric pressure and the pressure in the pipe to supplement air. In the process of supplementing air, the large-hole floating ball falls first, and when the pressure decreases greatly, then the small-hole floating ball falls. Therefore, the falling time of each floating ball is different, which buffers the pressure fluctuation in the pipeline. When the water pump enters the second stage of braking energy consumption condition, the pressure in the pipe increases and the water flow starts to flow backwards.

The falling float opens the air hole and exhausts until the air valve is full of water, the float floats, and the valve is closed. During the closing process, due to the different pressure effects of the large and small vent holes, the floating ball of the large pores is first lifted and closed, and then the small pores are closed, delaying the process of full closure and easing the pressure rise when the water column is closed again. The sealing end face of the lever is supported by a spring, which expands and contracts with the movement of the lever to ensure the sealing performance without exhaust. Similarly, when the system generates negative pressure, the water level in the valve chamber drops and the exhaust port opens. Because the external atmospheric pressure is greater than the system pressure at this time, air will enter the system through the exhaust port to prevent the harm of negative pressure. If the valve cover on the exhaust valve body is tightened, the exhaust valve will stop exhausting. Generally speaking, the valve cover should be opened. The exhaust valve can also be used with a shut-off valve to facilitate the maintenance of the exhaust valve.