A water conserving gate includes a base and a gate board configured to resist external water flow. A first supporting column, a second supporting column and a third supporting column are sequentially arranged on an upper portion of the base. A control box is arranged on the upper portion of the base. A first connecting rod is connected between a gate board and the first supporting column; a second connecting rod is connected between the gate board and the second supporting column. A third connecting rod is connected between the gate board and the third supporting column. A first rotary boss arranged on the first supporting column is movably connected with the first connecting rod. A second rotary boss arranged on the second supporting column is movably connected with the second connecting rod.

A water conserving gate includes a base and a gate board configured to resist external water flow. A first supporting column, a second supporting column and a third supporting column are sequentially arranged on an upper portion of the base. A control box is arranged on the upper portion of the base. A first connecting rod is connected between a gate board and the first supporting column; a second connecting rod is connected between the gate board and the second supporting column. A third connecting rod is connected between the gate board and the third supporting column. A first rotary boss arranged on the first supporting column is movably connected with the first connecting rod. A second rotary boss arranged on the second supporting column is movably connected with the second connecting rod.

A control gate adapted to be installed across a channel for liquids. The control gate includes a barrier member with a side member that has a circular arcuate section, the barrier member being pivotally mounted at or adjacent to the base of the channel; and a drive for raising and lowering the barrier member. The drive includes a cable, motor and first and second pulleys. The first pulley is coupled to the motor, the cable is secured to opposite first and second ends of the arcuate section, with the second pulley being adjacent to the arcuate section. The cable passes along the arcuate section from the one end to pass under the second pulley in contact therewith, is looped around the first pulley, above the second pulley, then passes under the second pulley and is secured to the second end of the arcuate section.

A control gate adapted to be installed across a channel for liquids. The control gate includes a barrier member with a side member that has a circular arcuate section, the barrier member being pivotally mounted at or adjacent to the base of the channel; and a drive for raising and lowering the barrier member. The drive includes a cable, motor and first and second pulleys. The first pulley is coupled to the motor, the cable is secured to opposite first and second ends of the arcuate section, with the second pulley being adjacent to the arcuate section. The cable passes along the arcuate section from the one end to pass under the second pulley in contact therewith, is looped around the first pulley, above the second pulley, then passes under the second pulley and is secured to the second end of the arcuate section.

An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.

An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.

An arrangement for controlling and measuring flow. The arrangement includes a fluid control barrier and a flow-measuring apparatus upstream of the fluid control barrier. The fluid control barrier includes a pair of plates for opening and closing a pipe, and the plates are movable towards a center line of the pipe to open the pipe and produce a symmetrical flow profile for the flow-measuring apparatus.

An arrangement for controlling and measuring flow. The arrangement includes a fluid control barrier and a flow-measuring apparatus upstream of the fluid control barrier. The fluid control barrier includes a pair of plates for opening and closing a pipe, and the plates are movable towards a center line of the pipe to open the pipe and produce a symmetrical flow profile for the flow-measuring apparatus.

A water conserving gate includes a base and a gate board configured to resist external water flow. A first supporting column, a second supporting column and a third supporting column are sequentially arranged on an upper portion of the base. A control box is arranged on the upper portion of the base. A first connecting rod is connected between a gate board and the first supporting column; a second connecting rod is connected between the gate board and the second supporting column. A third connecting rod is connected between the gate board and the third supporting column. A first rotary boss arranged on the first supporting column is movably connected with the first connecting rod. A second rotary boss arranged on the second supporting column is movably connected with the second connecting rod.

A water conserving gate includes a base and a gate board configured to resist external water flow. A first supporting column, a second supporting column and a third supporting column are sequentially arranged on an upper portion of the base. A control box is arranged on the upper portion of the base. A first connecting rod is connected between a gate board and the first supporting column; a second connecting rod is connected between the gate board and the second supporting column. A third connecting rod is connected between the gate board and the third supporting column. A first rotary boss arranged on the first supporting column is movably connected with the first connecting rod. A second rotary boss arranged on the second supporting column is movably connected with the second connecting rod.