The exhaust valve is an essential auxiliary piping system element, it is widely used in pipe line or elbow zui high place or breath, to exclude gas in the pipe to clear the pipe, to work properly. If this valve is not installed, the pipeline will have air resistance at any time , so that the water capacity of the pipeline will not meet the design requirements . Secondly , if the pipeline is in operation, the power failure will occur, and the negative pressure in the pump pipeline will cause the pipeline to vibrate or rupture. Exhaust, intake air quickly drawn into the pipe, the pipe to prevent vibration or burst. Function principle : When the water enters the pipeline , the plug stops at the lower part of the positioning frame and performs a large amount of exhaust. When the air is exhausted , the water enters the valve to float the ball , and the drive plug is closed to stop the exhaust. When the pipeline is in normal operation, a small amount of gas will naturally be generated . These gases will collect in the upper part of the tube . To a certain extent , the water level in the valve will drop . The float will be discharged from the small hole by the water . If there is a power outage, the pump is stopped , and the water in the pipeline is empty. Negative pressure will occur at any time , the float will drop in the water , open the small hole to drive the large hole to carry out a large amount of air intake to ensure the safety of the pipeline. We supply good variety yellow & red onions, fresh keeping. Advanced management plus careful cultivation, surely we have delicious and safe onions for every client. All our growing field registered at CIQ (China Entry-Exit Inspection And Quarantine Bureau) , we control farm chemicals from seeds to finished products. In the past over 20 years, no quality problem ever occurred. We can process and export 500tons of Fresh Onions per day with our ten onion sizing lines. Maximum exported quantity in June was more than ten thousand tons. Fresh Onions Fresh Onions,Fresh Red Onions,Fresh Cheap Onion,Fresh Yellow Onion Yirun Agricultural Cooperative , https://www.yiruncn.com