2. According to thrust analysis and calculation as well as different operation conditions, Flange Type Check Valve  is manufactured with different design mechanism and different rubber products by special processing,

 

  3. At positive operation the water flow inform entrance and the valve will be open at weak hydraulic pressure. the hydraulic pressure is higher .the valve gate will open more greatly and the water flow is greater ,

 

  4. At reserve operation, the valve gate closes naturally and seals tightly cut-off valve, the back pressure is higher, the valve gate closes more tightly and the seal effect is better.

 

  5. Flange Type Check Valve  is used widely in various drainage exits to prevent from pouring backwards and flowing backwards in city planning, water conservancy and sewage disposal etc, it is the ideal product to replace flap valve.