Double Orifice Air Valve

Innovative Design: When the exhaust valve is installed in the pipeline, when the water level in the pipe rises to 70%-80% of the height, that is, when it reaches the lower opening of the flanged short pipe, water enters the exhaust valve. Then, the floating body and the lifting cover rise, and the exhaust valve closes automatically. Since the pressure of the water in the pipeline fluctuates, the exhaust valve often has a water leakage problem when it is impacted by water hammer or under low pressure. The self-sealing design solves this problem well.

Optimal Performance: When designing the exhaust valve, the change in the cross-sectional area of the flow channel is taken into account to ensure that the floating body will not be blocked during a large amount of air exhaust. This is achieved by designing a funnel-shaped channel to maintain the change in the ratio between the internal cross-section of the valve body and the cross-section of the passage diameter, thus realizing the change in the flow area. In this way, even when the exhaust pressure is 0.4-0.5MPa, the floating body will not be blocked.For traditional exhaust valves, in order to prevent the floating body from being blown up and causing exhaust blockage, the weight of the floating body is increased, and a floating body cover is added to prevent the exhaust air from directly blowing onto the floating body, or a complex structural form is adopted. Unfortunately, although increasing the weight of the floating body and adding the floating body cover can help solve this problem, they bring two new problems. It is inevitable that the impact sealing effect is not good. In addition, it has a negative impact on the maintenance and use of the exhaust valve. The narrow space between the floating body cover and the floating body is likely to cause the two to get stuck, resulting in water leakage. Adding a self-sealing rubber ring on the inner lining steel plate can ensure that it does not deform under repeated impact sealing for a long time. In many practical applications, traditional exhaust valves have proven to be ineffective.

Prevention of Water Hammer: When a water hammer occurs during pump shutdown, it starts with a negative pressure. The exhaust valve automatically opens and a large amount of air enters the pipe to reduce the negative pressure, preventing the occurrence of a water hammer that could break the pipeline. When it further develops into a positive pressure water hammer, the air at the top of the pipe is automatically exhausted outward through the exhaust valve until the exhaust valve closes automatically. It effectively plays a role in protecting against water hammer. In places where the pipeline has large undulations, in order to prevent the occurrence of a closure water hammer, a current-limiting device is installed in conjunction with the exhaust valve to form an air bag in the pipeline. When the closure water hammer arrives, the compressibility of the air can effectively absorb energy, greatly reducing the pressure rise and ensuring the safety of the pipeline. Under normal temperature, water contains about 2% of air, which will be released from the water as the temperature and pressure change. In addition, the bubbles generated in the pipeline will also burst continuously, which will form some air. When accumulated, it will affect the water transportation efficiency and increase the risk of pipeline explosion. The secondary air exhaust function of the exhaust valve is to discharge this air from the pipeline, preventing the occurrence of water hammer and pipeline explosion.