Advantages (1) to maintain a high jet velocity. (2) to prevent the intrusion of seawater and sediment is one of the main properties of the duckbill valve. (3) in favor of the discharge pipe flushing. (4) Under certain conditions duckbill valve price, will be higher dilution. (5) does not corrode. Disadvantages rubber body does not apply to long-term open-air field operations duckbill valve manufacturers, using high-quality rubber can not avoid aging. (1) increase the project cost. (2) increase the diffuser head loss. Various cities in the province need to improve the drainage system, according to the survey of the region the number of products using duckbill valve must be more than the other regions. Because duckbill valve installed at the end of the pipeline can be very effective discharge of sewage duckbill valve, and is fully able to prevent the media back. Moreover duckbill valve products can do more to prevent intrusion into the street or sewer flooding, causing waterlogging, avoid losses. Duckbill valve manufacturers _ Serco supply material (certified) _ Jiangsu duckbill valve provided by Serco Gongyi City Water Supply Materials Co., Ltd. Serco Gongyi City Water Supply Materials Co., Ltd. (www.gyxjbcq.com/) is Zhengzhou, gate leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Serco leadership material in the water with the staff warmly welcome all inquiries negotiations to create Serco supply material a better future.