The fixed wheel gate or roller gate is the most used type of hydraulic gate: it can be used in water intakes and draft tubes, in bottom outlets, as canal lock doors and even as structure of regulation in surface spillways.
The main application of the fixed wheel gates, however, is in the installations that need protection elements, capable of closing by gravity due to their own weight and regardless of the conditions of the flow.
The fixed wheel gate will remain fully open, closing against the maximum water flow if a condition of emergency arises.