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The filter adopts high - strength wedge-shaped strainer to control the automatic cleaning of filter element through pressure differential control. When the impurity accumulates in the filter surface causes the import and export pressure difference to increase to the set value, or the timer reaches the preset time, the electric control box sends out the signal to drive the anti-flushing mechanism. When backwash suction dish and filter imports are pair, the drain valve is opened, the system pressure drainage, chuck and filter the inside a relative pressure below the filter of the lateral pressure of negative pressure zone, forcing some net circulating water from the inside filter lateral flow filter, adsorption on the inner wall of the filter in the impurity particles with flow into ç©£ disc and is discharged from the drain valve. The specially designed filter causes the inside of the filter to produce a jet effect, and any impurities will be washed away from the smooth inner wall. When the pressure difference of the filter is returned to normal or the timer set time is finished, the material does not break the flow during the whole process, and the anti-washing water consumption is low, which realizes the continuous and automatic production
Designed by Shandong High Speed Croup, the construction was entered December 2006 and finished in December 2010, after 14 a lot of planning researches since 1993, which employed 30,000 workers to develop, and used 450,000 plenty of steel and 2.3 million cubic meters of concrete, having a total investment of approximately 9 billion yuan. The open of the bridge will decrease traffic time from Qingdao to Huangdao District by at the very least 20 minutes and release pressure for the Jiaozhou Bay Expressway. Furthermore, the Qingdao Haiwan Bridge is the starting section of national expressway from Qingdao to Lanzhou and the key part of high way net of Shandong.
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