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<br /> <br />Figure 26. -Cutoff Valves for Sewers. <br />These types of valves can be used to <br />control the problem of flooding <br />from sewer backup. <br /> <br />36 <br /> <br />l1li <br /> <br /> <br />Cylindrical Plug Valve <br /> <br /> <br />Flanged End Gate Valve <br /> <br /> <br />Cross Section of Plug Valve <br /> <br />II <br /> <br />II <br />