Bottom Outlet Gates

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The Bottom Outlet Gates are high pressure gates that are employed as a safety device during general maintenance operations – their specific wide dimensions allow the dam basin to be emptied very quickly.
Located at the bottom (or “low level”) of the dam’s basin, they consist of a pressurised pipe that is closed by twin sliding gates, that allow water to pass through even when partially open.
The concept of twin operating gates in the dam’s bottom outlet enables extraordinary maintenance activities to be undertaken such as the removal of sand, debris and other kinds of obstructions that can accumulate in the bottom of the basin.
By closing the upstream gate, safe access is provided to the downstream gate for periodic maintenance activities such as seal replacement etc.

Note: the in-built by-pass system creates a balanced water pressure either side of the upstream gate resulting in the need for a smaller type hydraulic cylinder to actuate this gate, compared with a larger cylinder that is required to actuate the downstream gate. In spite of this, Vortex Hydra use identical sized cylinders to open and close both gates. The reason is this design consideration not only enhances long life performance, but also simplifies the management of the plant with regard to spare part storage.
The Bottom Outlet Gates are fabricated in steel plate that is suitably reinforced with various steel sections to withstand the water pressures. Vortex Hydra, as part of their design criteria, normally recommends the grade of steel to be used, but any special request from the customer can be analysed and agreed on.

The possible operational system of the gates could consist of the following:
• Twin hydraulic cylinders (double effect)
• Electric motorised gearbox
• Special operational system defined and agreed with the customer

Sealing System: rubber seals located on the gate that seat into a stainless steel sealing frames that are attached to the lateral structure.
All phases of the engineering design and fabrication through to final testing are undertaken by Vortex Hydra in compliance with UNI EN ISO 9001 Quality Management System.
Vortex Hydra design and manufacture Bottom Outlet Gates having dimensions up to 2 x 2m.



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