Sector Gates
These gates are widely used for sea locks at the entrance to marinas where passage through the lock is required under the widest possible tidal range.
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Advantages
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Can open or close with a full differential head.
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Operates with water loads from either side.
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Quick operating, typically 60 secs as the gates move through an arc.
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Cuts easily through any silting.
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Curved skin means water loads are transfered directly to the pivot which reduces friction.
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Disadvantages
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More complex design of gate structure and sealing.
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Larger civil works due to side recesses.
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Curved skin needs an assembly jig.
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Pivot alignment is critical.
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