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As their name implies channel gates are used to control flow in open channels, and therefore do not have a top horizontal seal, since the gate height is made about 100 mm greater than the maximum depth of fluid in the channel. They are usually mounted in slots in the side walls and floor, but they can be adapted to bolt against a wall face if necessary.
Channel gates seals are Neoprene angle type down the two vertical sides, sealing against the embedded frame members, whilst a rectangular compression type is used on the invert.
The operating gear is usually carried on the headframe bridge, but can also be pedestal- mounted on an overhead platform. Rising spindles are strongly recommended.
In cases where the channel depth is considerably more than the gate height, or where the height of the headframe is greater than normal, the spindle may have to be supported in guides in order to prevent buckling under compression when the gate is closed.
We can supply two alternative types of frames as follows:
|Type F||where the headframe legs are extensions of the embedded sections,|
|Type G||having a separate bolt-on headframe, which facilitates transport and erection, as the|
|embedded sections can be installed prior to the upper portion, which is then bolted on|
|later after completion of the civil work.|
Dimensions of the block-outs required in the channel sides and floor
types are given on Page 16.
For very wide gates, twin-lifting spindles may be required, in which case two inter-connected gearboxes are used, as shown below.
Click picture below to view enlarged drawing.
Twin-lift Channel Gate
Channel Gate &