TED Topographic Equalizing Device (TED) This is an adjustable unit that prevents emptying/draining of command tubes at the end of control on slopes. TED Topographic Equalizing Device (TED)This is an adjustable unit that prevents emptying/draining of command tubes at the end of control on slopes. Operation Insructions Free the calibration screw until the spring is free.Disconnect the command tube from the valve and send a water command to the valve.Wait until the air is drained from the tube and water begins to flow.Reconnect the command tube to the valve.Close the calibration screw 2/3 of it’s length.Stop the water command to the valve.Free the calibration screw slightly until a few drops of water go out of the tube.Check if the valve has changed its condition. If not, free the calibration screw a bit more until the valve changes its condition.Tighten the nut of the calibration screw, and the TED is calibrated. Applications Download PDF