T-Valves

Telescopic, or T-Valve Gates (can also be called bin-discharge or decanting), are used in waste water treatment plants and other water treatment applications to draw off surface fluids and scum. They have a lower (outer) tube which is connected to a drain pipe, and an upper (inner) tube which slides up and down, varying the level at which skimming is required to take place. Seals can be fitted between the inner and outer tubes to prevent leakage.