JP3030803B2 - Flow response gate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Generally, when water is taken from a river or irrigation canal, a gate is installed at the entrance, irrigation canal, or in the middle of a diversion canal so as to ensure an upstream water level and a flow rate. The present invention relates to a flow rate response gate in which the gate is controlled in accordance with a downstream use situation.

[0002]

2. Description of the Related Art As an example of a conventional water intake, as shown in FIG. 5, a waterway 1 drawn from an upstream river is provided with a gate 2 and a water diversion work 20 immediately upstream of the gate 2 supplies water to various places. (Japanese Patent Application No. 3-1004)
No. 76). As shown in FIG. 6, the gate 2 communicates with a still water pond 23 through an inlet 22 on the upstream side of the door 21 traversing the water channel 1, and on the downstream side of the door 21 through an outlet 24. It communicates with the retarding reservoir 25. A float chamber 27 containing a float 26 interlocked with the door 21 communicates with a basin 25 through an outlet 28, and a water level detection float 29 is installed in the basin 25.

[0003] The water level detection float 29 is floated on the water surface with the tension and the buoyancy of a spring 30 balanced, and is connected to a valve element 31 which opens and closes a discharge port 28. Since the discharge port 28 is provided with the leak port 32 formed by cutting off the edge thereof, even if the valve port 31 closes the discharge port 28, the water in the float chamber 27 flows out slightly from the leak port 32. It has become. With the above configuration, when the amount of use in the downstream area increases and the downstream water level drops, the outlet 28 is closed,
The door body 21 rises with the rise of the float 26, and the amount of water is replenished. Conversely, the amount used in the downstream area decreases,
When the downstream water level rises, the water level detection float 29 rises. As a result, the door 21 descends, the flow rate decreases, and the downstream water level falls.

[0004] As shown in FIG. 7, the difference between the water level immediately downstream of the gate and the water level at the position of the diversion 20 directly upstream of the downstream gate (hereinafter referred to as the water channel) is plotted on the horizontal axis of the gate opening. If the vertical axis indicates the water level difference, the water level difference in the water channel from the fully closed state to the fully open state of the gate 2 is -9.
Very similar to a sine curve from 0 ° to + 90 °.

Utilizing this, the water level immediately downstream of the gate 2 is corrected directly in accordance with the opening degree (hereinafter referred to as the water level).
We say setting water level. ), The discharge port 28 of the float chamber 27 is opened and closed to move the door 21 up and down, and the water level at the downstream diversion position is set to a predetermined height according to the gate opening.

An upper limit water level and a lower limit water level are set for the prevention of overflow from the upstream and the water diversion service of the diversion works 20, and
3 is provided with a water filling tank 33 and a water filling port 34 at the heights of the upper limit water level and the lower limit water level, respectively, so that water flows into the float chamber 27 from the water filling tank 33 or the water filling port 34. Further, a leak port 32 is provided at the discharge port 28 of the float chamber 27,
When the water level immediately upstream reaches the upper limit water level, water rapidly flows into the float chamber 27 from the water injection tank 33 and the gate 2 opens unconditionally, and when the water level reaches the lower limit water level, the amount of water flowing into the float chamber 27 decreases. The opening of the gate 2 is unconditionally reduced.

[0007]

As described above, if the amount of water used in the downstream diversion 20 increases and the water level in the water channel 1 decreases, the gate 2 opens. However, in the prior art, the set water level rises immediately as the gate 2 opens, so that the gate does not stop even if the downstream water level rises. Therefore, the flood wave generated by the opening of the gate reaches the downstream gate position and rises in water level, and the backwater (backwater) raises the water level at the upstream water level detection float position, and the water level corresponds to the opening. The opening movement of the gate 2 is stopped only after it is detected that the gate 2 has risen to the set position.

[0008] Therefore, if the opening speed of the gate 2 is high, the gate 2 opens too much, so that the amount of flowing water increases and the downstream water level becomes too high. As a result, the gate 2 performs the closing operation, but this time it closes too much. Thus, there is a problem that the water level is not easily stabilized by the gate 2 repeating the opening and closing movement. Conversely, if the opening speed of the gate 2 is too low, the response of the gate 2 will be delayed and the error in the water level will increase, so an appropriate opening / closing speed is required. Since it varies depending on the flow rate, it is almost impossible to adjust the opening and closing speed. That is, the first problem that when the water separation amount in the downstream changes abruptly, the gate 2 repeatedly opens and closes, and the water level or the water level difference is not stabilized, or the response of the gate 2 is delayed and the water level error increases. was there.

The upstream water passage and the downstream water passage of the gate 2 are separated by the door 21, but the water supply port 34 and the float chamber 2 are separated.
A detour is formed through 7 and the leakage port 32.
Therefore, when water is not divided for a long time at night, the upstream water level drops to the height of the water supply port 34 due to the pilot flow passing through the water supply port 34, the float chamber 27, and the leak port 32, and when the water distribution starts the next morning, There was a second problem of lack of storage.

[0010]

In order to solve the above-mentioned first and second problems, a door is provided upstream of a main arm provided on a main shaft crossing a water channel, and a door is provided on a side of the water channel. The float in the float chamber is connected to a float arm projecting upstream from the main shaft, and a still water reservoir communicating with an upstream water channel of the door body is provided, and a free water reservoir communicating with a downstream water channel is provided, and the float is provided. The chamber is connected to a still water pond via a water supply pipe and communicates with a detention pond via a discharge port, and a water level detection float accommodated in the detention pond is suspended by a first wire rope, and the other end of the wire rope Suspends a valve element that opens and closes the water supply pipe, and connects one end of a second wire rope to an intermediate portion of the first wire rope. A spring and a backwater are connected to the intermediate portion of the second wire rope. Is sensed
The internal piston is almost in equilibrium in the time until
And a second end connected to a water level correcting arm that rotates in a direction opposite to the direction of rotation of the main arm.

[0011] In the delay device, a piston may be fixed to an intermediate portion by penetrating a piston rod into a cylinder filled with liquid, two chambers separated by the piston may be communicated by a bypass pipe, and the piston may be connected to the bypass pipe.
A needle valve for adjusting the moving speed of the
A second spring is provided at each end of the piston rod through a spring.
Characterized in that it is interposed in the middle of the wire rope.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A gate according to the present invention is provided in a channel drawn from a river, and a diversion is provided immediately upstream of the gate. Usually, a plurality of gates and diversions are provided in the channel. It is provided at intervals. The gate is provided with a water level detection float for detecting the downstream water level, so that the door is moved up and down. That is, when the amount of water used in the diversion works downstream of the gate increases, the water level at the diversion position decreases, and the water level at the water level detection float position of the gate decreases due to the backwater. Then, the water level detection float is lowered, the valve body is raised, the amount of inflow into the float chamber is increased, the float is raised, the door body rotates upward, and the gate opens.

Here, the water level detection float is suspended via a spring and a delay device, and the springs are arranged before and after the delay device, respectively. When the gate is opened as described above, the spring on the water level correction arm side tends to contract, but since the piston hardly moves due to the resistance of the liquid, the set water level does not change at the moment when the gate is opened. Over time, the gate stops once when the water level immediately downstream of the gate rises to the same level as before. In addition, the rise of the door body causes a large amount of stored water to flow at once (flood wave), but the water level gradually decreases downstream of the gate, and the water level continues to decrease. On the other hand, since the set water level gradually rises due to the delay device, the door body gradually rises, and as the water level gradually rises, the entire section is almost in a steady state when the flowing flood wave reaches the downstream gate position Becomes

The water level at the water diversion position immediately upstream of the downstream gate at the time when the flow becomes substantially constant is lower than a predetermined height. Rises, and the water level immediately upstream of the downstream gate has a predetermined height.

The movement speed of the piston should be proportional to the amount of change in water level with respect to the change in gate opening divided by the time until backwater is sensed. The condition is different from the state of the intermediate opening.
Therefore, the water level correction arm is positioned in a straight line with the wire in the fully open / closed state. At the beginning of the operation, the amount of contraction of the spring on the water level correction arm due to the rotation angle of the water level correction arm is small, and the movement speed of the piston is reduced. Is extremely small, the amount of change in the water level with respect to the change in the opening degree is small in the state of full opening and close to full closing. Actually, when the gate is almost fully open, the gate does not suddenly open and overflow, and when it is almost fully closed, it can follow even if the time until the backwater is detected is long, and the gate suddenly operates. To prevent repeated opening and closing.

On the other hand, in the state of the intermediate opening, the amount of change in the water level with respect to the change of the opening is large, and the time until the backwater is detected is short. Therefore, in the state of the intermediate opening, the angle between the water level correction arm and the wire is almost a right angle, and the piston moves at a high speed in this situation, and the response of the gate is not delayed.

If the upstream water level becomes lower and the overflow water depth above the water filling cylinder becomes smaller, the amount of water flowing into the float chamber decreases, and the water level in the float chamber lowers and the gate closes, so that the lower limit water level is maintained. That is no different from the prior art. Also, if the downstream water level becomes sufficiently high, the water level detection float rises, and conversely, the water level control valve lowers, closing the inflow port at the upper end of the water refill pipe, so that the upstream water level is higher than the water refill port. Also, the pilot flow passing through the float chamber is blocked. Therefore, the upstream water level does not drop to the lower limit water level.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in the prior art, the gate 2 according to the present invention is mainly used when a large number of gates 2 are installed within the range of the backwater in the waterway 1 from the immediately downstream to the most downstream of the intake works. In addition, a diversion 20 is provided in the water channel 1 immediately upstream of the downstream gate.

As shown in FIGS. 1 and 2, the gate 2 has a door 2a traversing the water channel 1 over its entire width, and a main arm 2b fixed near both ends thereof has a center of an arc on the door 2a. In this position, the counterweight 2 is fixed to a rotatably supported main shaft 2c near the downstream end of the main arm 2b.
d is mounted, and the weight and position of the counterweight 2d are adjusted such that the entire center of gravity of the gate 2 is located above the upstream of the main shaft 2c.

A float chamber 3 is provided beside the water channel 1,
A float arm 4 protruding upstream from the center of the float chamber 3 of the main shaft 2c is fixed to be horizontal when the gate 2 is fully closed, and an involute-shaped groove 4a is cut at the tip thereof. Fitted suspension wheel 4b
A float 5 is suspended at the center of the upper surface via an axle 4c. A guide roller 5a is mounted on a pair of brackets vertically fixed to both ends of the float 5, and a corresponding pair of guide rails 5b is fixed vertically from the peripheral wall.

The float 5 comprises a lower sealing portion 5c and an upper water guiding portion 5d, and is opened in the water guiding portion 5d to open the sealing portion 5d.
A water guide pipe 6a of the water guide device 6 that protrudes from the lower end of the float 5 through the c is provided, and is connected to the flexible pipe 6b.
On the other hand, the float chamber 3 has an upstream waterway 1 with respect to the gate 2.
Pond 8 communicated with the water channel 1 on the downstream side of the gate 2 and the retarding pond 8 communicated with the gate 2 via a wall.
A flexible pipe 6b is connected to a water pipe 6c supported on the wall surface and communicating with the retarding pond 8. Hereinafter, a state in which the lower end of the door 2a of the gate 2 matches the planned water level is referred to as a fully opened state, but the upper end of the sealing portion 5c matches the planned water level in the fully opened state.

A water injection tank 9a of the water injection device 9, which is open at the height of the planned water level in the still water reservoir 7, is communicated with the float chamber 3 through a water injection pipe 9b. Although the height of the water injection tank 9a is constant, it may be suspended to control the height as shown in the related art (see Japanese Patent Application No. 3-100476). In addition, as for the upstream water diversion works 20, the water diversion is not affected at any gate opening degree, as shown in FIG.
As shown in the figure, a lower limit water level in the form of a sine curve from -90 ° to + 90 ° is established, but in the state of the planned discharge, the lower water level matches the planned water level.

On the other hand, a large gear 14 is fitted to the main shaft 2c at a portion protruding to the side of the water channel 1, and a small gear 15 engaged with the large gear 14 is provided. When the gear rotates from the fully open state to the fully closed state, the small gear 15
It is designed to rotate 80 °. The arm 10a of the water refilling device 10 is mounted on the shaft of the small gear 15. Therefore, the water refill cylinder 10d is inserted into the still water pond 7 via the third wire rope 10b and the pulley 10c by the arm 10a which rotates by 180 degrees between the fully opened state and the fully closed state of the gate 2.
Are suspended, and the upper end thereof is configured to be slightly lower than the lower limit water level corresponding to the gate opening degree,
The upper and lower outer sides of the upper end of d are covered with the dustproof and waveproof tube 10e at an appropriate interval and height.

The water bottle 10d is provided with a water level control valve 1 described later.
In order to avoid position conflict with the first wire rope 12b suspending 2d, two third wire ropes 10b are used.
b, both ends are suspended, and the wire rope 10b passes through the upper two pulleys 10c and is then united and fixed to the arm 10a. In addition, water bottle 10
The water refill pipe 10f loosely fitted to d is vertically arranged and opened at its upper end, and the water refill pipe 10f is bent toward the float chamber 3 at the lower part and opens into the float chamber 3. Further, when the gate 2 is fully opened, the arm 10a is aligned with the wire rope 10b, and the height of the water supply port coincides with the lower limit water level in the fully closed state.
The length of a is determined. In addition, a discharge pipe 11 is supported on a wall between the float chamber 3 and the retarding basin 8, one end is opened in the float chamber 3, and the other end is opened in the retarding basin 8 through a small discharge port 11 a. ing.

The above-mentioned first wire rope 12b and water level control valve 12d are provided in the water level control device 12, and will be described below together with peripheral members. The water level detection float 12a floating in the retarding basin 8 is a wire rope 12
b, the wire rope 12b is supported by the pulley 12c above the wire rope 12b, and further suspended by another pulley 12c toward the water supply pipe 10d, and a conical water level control valve 12d is fixed to the lower end of the wire rope 12b. Refill pipe 1
It is detachable from the opening of 0d.

The water level detecting float 12a is suspended inside an abutment 12e and a buffer cylinder 12f provided on the support 12e, and a detection water inflow / outflow pipe 12g opening to the retarding pond 8 is provided below the buffer cylinder 12f. There is. In addition, the water level control valve 12d
The pulley 12c directly above the pulley 10c is
c.

Next, a water level correcting device 13 which is a main part of the present invention.
Will be described. First, the water diversion 20 downstream of the gate 2 is set at an intermediate water level between the planned water level and the lower limit water level in the fully closed state, and coincides with the planned water level in the fully opened state. The water level correction arm 13a mounted on the shaft of the small gear 15 rotates by 180 ° between the fully opened state and the fully closed state, and a primary wire rope 13b of a second wire is connected to the tip thereof, and further, The primary spring 13c, the delay device 13d, the secondary spring 13e, and the secondary wire rope 13f of the second wire are sequentially connected. The secondary wire rope 13f (second wire) is connected to the wire rope 12b (first wire) so as to move in the same direction.

The water level correction arm 1 in the fully opened state
At the position 3a, the direction is adjusted by the pulley 13g so that the primary wire rope 13b is on a straight line.

The spring constant of the length of the water level correction arm 13a and the sum of the primary spring 13c and the secondary spring 13e is such that the draft line of the water level detection float 12a in the fully closed state of the gate 2 is at the intermediate water level of the downstream diversioner 20. Although designed to match, the number of turns and length of the primary spring 13c and the secondary spring 13e are made sufficiently large.

As shown in FIG . 3, the delay device 13d
Is a piston rod 1 having a piston 13i fixed to an intermediate portion thereof in a cylinder 13h filled with lubricating oil.
3j are penetrated, and two chambers of a cylinder 13h separated by a piston 13i are connected to an oil passage pipe 13 opened at an upper end and a lower end.
k (bypass pipe) . The needle valve 131 mounted on the oil passage pipe 13k has a piston 13i.
The moving speed of the vehicle is adjusted appropriately. Also,
Both ends of the piston rod 13j are connected to a primary spring 13c and a secondary spring 13e .

Next, the operation will be described. If the amount of water diversion at the position of the downstream diversion 20 increases, the water level in the water channel 1 upstream thereof decreases, and the effect thereof is caused by the backwater and the water level detection float 12a of the gate 2 upstream of the diversion 20 due to the backwater. Water level drops. Therefore, FIG.
The water level detection float 12a shown in FIG .
The upstream water level control valve 12d rises, and the float chamber 3
The inflow into the inside increases . Then, rising water level in the float chamber 3, since the buoyancy acting on the float 5 is increased, the float 5 while discharging the water in the water conduit 5d mainly raised
The arm 2b rotates, the gate 2 opens, and the water channel 1 immediately downstream is opened.
The water level inside rises . At this time, in conjunction with the main arm 2b
The water level correction arm 13a rotates and the primary wire rope 1
3b, actuate the primary spring 13c. But the primary case
13c connected to the delay device 13d connected after the
Immediately below because the connected secondary spring 13e does not contract
Changing the set water level due to the rise in water level in the water channel 1 of the flow is happening
Absent.

Therefore, when the water level immediately downstream of the conventional water level recovers, the gate 2 temporarily stops . Then further
To continue to gradually decrease the water level just below the flow by flood wave flows down, also the piston 13i is moved gradually
Since the water level detection float 12a begins to follow the water level set <br/> constant head becomes higher by, that gradually continues to open gate 2.
Then, this time, the flood wave flows down while the water level immediately downstream rises gradually, and when the flood wave reaches immediately upstream of the downstream gate 2, the flow becomes almost constant. Also, as described repeatedly, if the moving speed of the piston 13i is too high,
The gate is opened and closed repeatedly, and the water level or water level difference stabilizes.
Since there is a problem that no, at the time when almost constant flow conditions, but immediately upstream of the water level in the downstream of the gate 2 is lower than a predetermined, gradually rises piston 13i is pulled to the secondary spring 13e As the set water level becomes higher, the water level of all sections gradually rises, and the water surface gradient becomes gentler . Finally, just upstream of the water level in the downstream of the gate 2 is higher than before by the amount of flow is increased.

The above operation is based on the premise that the moving speed of the piston 13i is proper, so that the
Adjust. As described above, the moving speed of the piston 13i should be proportional to the amount of change in the water level with respect to the change in the opening of the gate 2 divided by the time from when the gate 2 opens and closes to when backwater is detected. is there. But
Further, as shown in FIG. 7, the fluctuation of the water level difference due to the change in the opening degree of the gate 2 is small in a state close to the fully open state and the state close to the fully closed state.
Further, in a state close to the fully closed state, if the water level and the flow rate change drastically, flooding occurs. Therefore, it is desirable that the speed of the piston 13i is low. In particular, in a state close to the fully closed state, it takes a long time to reach, and the time until the backwater is detected is long.
It is desirable that the moving speed of i be low . In the embodiment , the water level correction arm 13a
And the primary wire rope 13b is close to a straight line, and the primary spring 1
Since the amount of shrinkage of 3c is small, the moving speed of the piston 13i is extremely low, so that flooding and repetition of opening and closing do not occur.

Further, in the state of the intermediate opening, the fluctuation of the water level due to the change of the opening of the gate 2 is large, and the time until the backwater is detected is short, so that the speed of the piston 13i may be large. Is necessary . In the embodiment
Is the water level correction arm 13a in the state of the intermediate opening.
Since the primary wire rope 13b and the primary wire rope 13b are close to a right angle, the amount of contraction of the primary spring 13c and the speed of the piston 13i are large, so that the set water level is rapidly changed, and the gate 2 can respond to a change in flow rate without delay. The time until the backwater is detected varies depending on the gradient of the channel and the distance to the diversion 20, but can be freely changed by adjusting the needle valve 131.

As described above, when the water separation amount in the downstream water diversion works 20 increases and the upstream gate 2 is opened, the water level in the upstream falls, so that the upstream gate 2 is opened one after another and the intermediate gate is opened. The stored water between the water level and the lower water level is released, and finally the water intake from rivers etc. increases. Conversely, downstream diversion 2
If the water flow rate is reduced or the flood flows into the waterway 1, the upstream gate 2 will of course be closed one after another, but it will be stored in the space between the planned water level and the intermediate water level, The amount is reduced. The following is a supplementary explanation on the accuracy of the intermediate water level. In order for the discharge and storage to be carried out smoothly as described above, it is sufficient if the intermediate water level is almost at a height between the planned water level and the lower water level, but in the fully closed state, the intermediate water level is lower than the planned water level and the lower water level. The middle water level and the lower water level are equal to the planned water level in the planned discharge condition. At an intermediate opening, the lower limit water level and the set water level are both sine curves from -90 ° to + 90 °,
Further, as shown in FIG. 7, since the water level difference of the water channel is close to the sine curve, the intermediate water level is almost halfway between the planned water level and the lower limit water level.

If the water diversion in the diversion works 20 is stopped,
The water level of the downstream water channel 1 rises rapidly, the water level detection float 12a rises, the water level control valve 12d falls, the upper end of the water refill pipe 10f is closed, and the inflow into the float chamber 3 is cut off, On the other hand, since there is an outflow from the discharge pipe 11, the water level in the float chamber 3 drops, but since the outside of the water refill cylinder 10d is covered with the dustproof and waveproof pipe 10e, the water refill pipe 10f
The dust does not bite between the upper end of the valve and the water level control valve 12d. Therefore, the gate 2 is completely closed by its own weight to be in a fully closed state, and the pilot flow flowing into the float chamber 3 from the water filling cylinder 10d is completely shut off, so that the gate 2 is filled with water to near the upper limit water level. Keep fully closed state. Therefore, if a large amount of water distribution is suddenly stopped, the upstream water level rises to the upper limit water level.
Water flowing into the float chamber 3 rises and the water level rises, and the gate 2 is opened unconditionally.

Since the gate 2 is kept in a fully closed state while being fully filled with water, the storage amount when the water distribution is started the next morning is sufficiently large. When the water level drops to the intermediate water level, the upstream gate 2 opens one after another, and the water level in the upstream waterway 1 drops to near the lower limit water level, and the stored water is discharged. Therefore, when a large amount of water diversion is suddenly started, the water level upstream of the upstream gate 2 suddenly drops, but when the overflow water depth on the water filling cylinder 10d decreases, the float chamber 3
Since the inflow amount into the inside decreases, the opening degree of the gate 2 decreases, and the lower limit water level is maintained, there is no hindrance to the water diversion of the upstream diversioner 20.

As described above, in the prior art, the structure is extremely simple utilizing natural hydraulic power, and there is no fear of erroneous operation, power failure, and the like. The effect is remarkable because the reliability and the amount of storage are secured.

[0039]

The present invention is configured as described above, and controls the float interlocking with the door by the water level detection float so that the change in the water flow due to the operation of the door does not immediately affect the water level detection float. , The water level correcting arm and the delay device are operated. Further, since the water level correction arm operates in accordance with the vertical movement of the door, the water level detection float moves according to the fully opened / closed state of the gate, and the control of the water level is ensured. Further, when the water level control valve is closed, the flow path through the float chamber and the retarding pond of the upstream water is shut off, and the stored water is not reduced by the gate, so that the management of the flowing water becomes easy.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a control unit of a gate according to an embodiment of the present invention.

FIG. 2 is a plan view of the gate shown in FIG.

FIG. 3 is a schematic diagram showing a configuration of the delay device shown in FIG.

FIG. 4 is a graph showing a relationship between a gate opening degree and a water level of a gate according to an example.

FIG. 5 is a schematic diagram illustrating the arrangement of a diversion and a gate provided in a conventional waterway.

FIG. 6 is a side sectional view showing a conventional gate control unit.

FIG. 7 is a graph showing a relationship between a gate opening degree and a water level difference between gates of a conventional gate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterway 2a Door body 2b Main arm 2c Main shaft 3 Float room 4 Float arm 5 Float 7 Still water pond 8 Reservoir 10f Supplementary pipe 11a Outlet 12a Water level detection float 12b First wire 12d Valve body 13a Water level correction arm 13b, 13f 2 wires 13c, 13e Spring 13d Delay device 13h Cylinder 13i Piston 13j Piston rod 13k Bypass pipe

Claims (2)

(57) [Claims] A door is provided on an upstream side of a main arm provided on a main shaft crossing a water channel, and a float in a float chamber provided on a side of the water channel is connected to a float arm projecting upstream from the main shaft. And, while providing a still water reservoir communicating with the upstream water channel of the door body, providing a retarding water reservoir communicating with the downstream water channel, connecting the float chamber to the still water reservoir via a water supply pipe and via a discharge port A water level detection float accommodated in the retarding basin is suspended by a first wire rope, and the other end of the wire rope hangs a valve element for opening and closing the water supply pipe, and a first wire One end of a second wire rope is connected to an intermediate portion of the rope, and a spring and a time until the backwater is detected at the intermediate portion of the second wire rope.
A delay device in which the internal piston is in a substantially equilibrium state is interposed, and the other end is connected to a water level correction arm that rotates in a direction opposite to the rotation direction of the main arm. Characterized flow response gate. 2. A delay device, the liquid passed through the piston rod in the filled cylinder was allowed to secure the piston to the middle portion, two chambers separated by the piston communicates with the bypass pipe, the piston into the bypass pipe Transfer
2. The flow rate response gate according to claim 1 , further comprising a needle valve for adjusting a dynamic speed, wherein both ends of said piston rod are interposed at respective intermediate portions of a second wire rope via springs. .