JP2003113951A - Emergency cut off valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency cut off valve device capable of saving installation area, reducing a manufacturing cost and preventing a trouble such as oil leakage by simplifying and functionally arranging the device. SOLUTION: The emergency cut off valve device comprising an emergency cut off valve closing a valve element by own weight of a weight attached to an arm interlocking with a valve shaft and opening the valve element with a hydraulic cylinder connected to the valve shaft, and a hydraulic unit driving the hydraulic cylinder, is provided with a hydraulic pump 17 in a head block 16 of the hydraulic cylinder 14, an oil tank 15 on an outer circumference part of the cylinder casing 14, and a hydraulic control valve group 19 adjacently to the head block 16 to integrate the hydraulic cylinder 14 and a hydraulic unit 13. Consequently, the emergency cut off valve device is made compact, saves the installation area, reduces a manufacturing cost, and reduces frequency of troubles such as oil leakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff installed in pipes for water and sewage, electric power, plant equipment, etc. and capable of automatically closing pipelines in the event of an emergency such as a large earthquake or damage to pipelines. The present invention relates to a rotary valve such as a valve, and more particularly to a rotary valve device in which a hydraulic unit is integrated.

[0002]

2. Description of the Related Art Valves are installed in pipes for water and sewerage, etc. to close pipelines, and one of them is an emergency shutoff valve. This emergency shutoff valve normally uses a rotary valve to automatically and promptly shut off the pipeline in the event of an emergency such as a large earthquake, landslide, or damage to the pipeline due to aging of the pipeline. It is installed in order to ensure the safety and prevent secondary disasters due to runoff, and the one shown in FIG. 8 is known.

In the emergency shutoff valve 1a shown in FIG. 8, a butterfly valve having a valve shaft 4 inserted into a valve body 3 of a valve body 2 and having a valve body 5 attached to the valve shaft 4 is used. Has been. An arm 7 equipped with a weight 6 at its tip is rotatably attached to one end of the valve shaft 4 in order to rotate the valve shaft 4 coaxially with the valve shaft 4 to close the valve body 5. There is. The shaft to which the arm 7 is attached is connected to an output shaft of an electromagnetic brake 45 that controls the rotation of the arm 7 via an on-axis speed reducer 44. A holder 47 is fixed to a bracket 46 provided on the valve box 3, and a hydraulic shock absorber 48 for controlling the rotation speed of the arm 7, that is, the valve closing speed of the valve body 5 is connected to the holder 47. .

On the other end side of the valve shaft 4, a clutch 49 is installed coaxially with the valve shaft 4 in a manual opening / closing device 52 for opening the rapidly closed valve body 5 and returning it to an emergency standby state. Is turned on and off by a manual operation of the handle 51 connected to the worm shaft 50a of the electric opening / closing device 50.
The valve body 5 can also be opened by the electric opening / closing device 50.

The electromagnetic brake 45 and the electric switchgear 50 are connected to a control panel 56 by electric wires 53, 54 and 55.

The valve body 5 is normally an electromagnetic brake 4
5, the valve is locked in the open state, the seismometer detects horizontal vibration due to the earthquake, and when the seismic intensity exceeds a set value, an emergency signal is issued to the control device of the electromagnetic brake 45. Similarly, an orifice is installed in a pipe line that requires abnormality detection, the differential pressure before and after the orifice is detected, and when the differential pressure exceeds a set value, an emergency signal is issued to the control device of the electromagnetic brake 45. When the lock by the electromagnetic brake 45 is released by these signals, the weight of the weight 6 itself causes the arm 7 to move.
However, the rotation speed is controlled while being controlled by the hydraulic shock absorber 48, and the valve body 5 is closed.

[0007]

However, the emergency shutoff valve 1a controls the rotation speed of the arm 7 to prevent the water hammer action (water hammer), so that the hydraulic shock absorber 48 is installed in the valve body 2 of the emergency shutoff valve 1a. It is attached to the weight 6 via the arm 7 or the electromagnetic brake 45 is installed at the end of the valve shaft 4 on the weight 6 side. Therefore, the bulk of the emergency shutoff valve is increased, the installation area is increased, and the manufacturing cost is increased. Moreover, the electric wiring from each of the above-mentioned auxiliary devices to the operation panel of the emergency shutoff valve is complicated and long.
Further, in order to immediately close the valve body 5 when the emergency signal is generated, the clutch 49 disconnects the manual opening / closing device 52 from the valve shaft 4 in advance to restore the emergency standby state. Need to be kept.

In order to eliminate such inconvenience, for example, in Japanese Utility Model Publication No. 61-39891, a bypass pipe that connects the piston side chamber and the rod side chamber is provided in the hydraulic shock absorber 48, and the bypass pipe is provided in the bypass pipe. A throttle valve and a solenoid valve are provided, the solenoid valve is connected to an abnormality detection device such as an earthquake detector, and a signal from the detector causes the solenoid valve to open to communicate the bypass pipe. It is disclosed that the body can be rotated in the valve closing direction by the weight to close the valve body.

According to this method, the lock of the valve body is
This is made possible by operating an electromagnetic valve provided in the bypass pipe, and the rotational speed of the valve body is adjusted by a throttle valve attached to the bypass pipe. Therefore, the electromagnetic brake 45 and the axial deceleration directly connected to it are reduced. Although it is not necessary to use the machine 44, the opening / closing device for resetting the valve element from the valve closing position to the valve opening position and the mechanism for connecting and disconnecting the valve shaft are still required as in the conventional case. Is.

On the other hand, in Japanese Patent Publication No. 1-27310,
A main hydraulic cylinder for rotating the valve body is connected to one end of an operating lever that is coaxially attached to the valve shaft, and in addition to this main cylinder, a spring that biases the other end of the operating lever in the direction opposite to the piston pressing direction. A hook that is rotatably supported by a bracket fixed to the valve box so as to connect an auxiliary cylinder for turning the valve body, which engages with the operating lever at the intermediate opening position of the valve body. A spring return type hydraulic cylinder for stopping the intermediate opening of the valve body is connected to the member.

By controlling the hydraulic circuit of the hydraulic unit composed of a control valve such as a solenoid valve, a hydraulic pump, and an oil tank, the valve body is shut off from full open to emergency shut, that is, from fully closed to emergency shut off standby. In the state, that is, fully open, and from the full open to the intermediate opening degree, respectively.

According to this method, the electromagnetic brake 45, the on-axis speed reducer 44, the opening / closing device, and the on / off mechanism are not required as compared with the conventional emergency shutoff valve described above, and the number of devices attached to the emergency shutoff valve body is reduced. Although greatly reduced, the above-mentioned two hydraulic cylinders are required for opening and closing the valve body. In addition, the solenoid valve, the hydraulic pump, and the oil tank must be connected to each other by piping, and the motor for driving the hydraulic pump is installed on a separate stand, so it is difficult to say that the functional device configuration is functional. It is left. Further, oil leakage is likely to occur at the pipe joint portion of the hydraulic circuit, and this oil leakage should not occur especially when the emergency shutoff valve is installed in the pipeline of water supply.

Therefore, an object of the present invention is to provide an emergency shutoff valve device which simplifies and functionally arranges the device, saves the installation space and manufacturing cost, and prevents the occurrence of troubles such as oil leakage. Is.

[0014]

In order to solve the above problems, the present invention adopts the following configuration.

That is, a valve body in which a valve body is rotatably mounted inside a valve box, an arm which rotates in conjunction with a valve shaft of the valve body, and an arm which is attached to this arm and which is attached by its own weight to the valve body. A weight that closes the valve, a hydraulic cylinder that is rotatably connected to the valve shaft, and a hydraulic unit that drives the hydraulic cylinder to open the valve body by linear movement of the piston rod. In the emergency shutoff valve device, the hydraulic cylinder is provided with a hydraulic unit including a hydraulic pump, a drive motor of the hydraulic pump, a hydraulic control valve, and a hydraulic tank, and the hydraulic unit is integrated with the hydraulic cylinder. I did.

As described above, if the hydraulic cylinder and the hydraulic unit are integrated, the entire apparatus can be made compact, and the piping between the hydraulic unit and the hydraulic cylinder and between each device of the hydraulic unit can be eliminated or significantly reduced. , Troubles such as oil leaks can be avoided and the installation space can be saved.

The hydraulic pump may be provided in the head block of the cylinder casing, and the oil tank may be provided on the outer peripheral portion of the cylinder casing.

According to this structure, since the head block can be used as a casing of the hydraulic pump, a flow path for efficiently sucking and discharging working oil, that is, oil to the movable portion of the hydraulic pump is provided in the head block. It can be formed, and since the oil tank is provided on the outer peripheral portion of the cylinder casing, the device can be easily integrated and becomes functional.

It is desirable that the hydraulic cylinder is swingably supported by the valve box.

In the process of rotating the valve shaft by advancing or retracting the piston rod of the hydraulic cylinder, the tip end portion of the piston rod draws a circular locus, so that the hydraulic cylinder should be swingably supported on the valve box. Thus, the valve shaft can be smoothly rotated and the valve body can be opened and closed.

It is desirable that the hydraulic circuit of the hydraulic unit is provided with a locking circuit so as to hold the valve element in the open state unless there is a valve closing signal.

In this way, even if a locking device such as an electromagnetic brake is not used, the valve body in the valve closed state can be opened,
That is, it can be held in a fully opened state. As a result, it is possible to secure the circulation of the pipeline in the normal state and to take a valve closing standby state such as an emergency cutoff of the pipeline in the abnormal state.

When the valve body is closed from the standby state, the flow path of the hydraulic control valve is switched by a closing signal such as an abnormality detection signal to unlock the fully opened state of the valve body. The piston rod connected to the valve shaft can move forward, and the weight of the weight causes the piston rod to move forward and the valve shaft to rotate. The valve is opened from this closed state by switching the hydraulic control valve to overcome the weight of the weight, and the piston rod retracts to rotate the valve shaft. Therefore, the opening / closing device for returning the valve body from the fully closed state to the fully opened state and the clutch of the opening / closing mechanism between the opening / closing device and the valve shaft are not required, and the device is simplified. As a result, the installation area can be reduced and the manufacturing cost can be reduced.

It is desirable that the hydraulic circuit of the hydraulic unit be provided with a speed reducing circuit for reducing the valve closing speed of the valve body.

With this configuration, when the abnormality is detected or the like, the piston rod is closed before the valve body is fully closed without shutting off the pipe by abruptly closing the valve body. The forward speed of the valve can be reduced, and the rotational speed of the valve body can be slowed to the fully closed state. Accordingly, the water hammer effect (water hammer) can be prevented without separately providing a hydraulic shock absorber. The forward position can be detected, for example, by providing a limit switch at a required position.

The control panel of the hydraulic unit may be integrated with the hydraulic unit or attached to the cylinder casing of the hydraulic cylinder. By doing so, the electrical wiring between the control panel and each device of the hydraulic unit can be shortened, and thus the wiring work and maintenance are simplified.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An emergency shutoff valve device according to an embodiment of the present invention will be described below with reference to the accompanying FIGS.

In the emergency shutoff valve device 1 of the embodiment shown in FIGS. 1 and 2, a valve shaft 4 is inserted through a valve casing 3 of a valve body 2, and a valve body 5 is attached to the valve shaft 4. The attached butterfly valve, the arm 7 that is coaxial with the valve shaft 4 and rotates in conjunction with it, and is attached to the tip of the arm 7 and rotates the valve shaft 4 by its own weight in an emergency to rotate the valve body 5. A linear movement of a weight 6 for closing the valve, a hydraulic cylinder 14 rotatably connected to the valve shaft 4 via a lever 8 integrally formed at the rear end of the arm 7, and a piston rod 21 thereof. The hydraulic unit 13 drives the hydraulic cylinder 14 so as to open the valve body 5.

A bracket 9 is fitted and fixed to the valve shaft 4 of the valve box 3, and a holder 10 is fixed to the side of the bracket 9 opposite to the valve shaft 4. An opening degree scale 11 indicating the valve opening degree is provided on the lower side of the valve shaft 4 of the bracket 9 in the figure, and the valve opening degree is displayed by a pointer 12 attached to the valve shaft 4. Then, the water pipes 60a and 60b are connected to the openings at both ends of the valve box 3, and when the valve body 5 is open,
Water flows through this water pipe.

A tip end of a hydraulic cylinder 14 for opening and closing the valve body 5 integrally provided with an oil tank 15 is pin-connected to the holder 10 and is swingably held by the valve box 3 so that the hydraulic cylinder 14 can be rotated. The tip of the piston rod 21 is pin-coupled to the lever 8, and the reciprocating motion of the piston rod 21 causes the valve shaft 4 to rotate while swinging the hydraulic cylinder 14 to open and close the valve element 5. .

FIG. 3 shows the structure of the hydraulic unit 13 for operating the emergency shutoff valve device 1.
The hydraulic unit 13 includes a hydraulic cylinder 14, an oil tank 15 having a hermetically sealed oil supply port 15a provided all around the cylinder casing 14a, and a hydraulic pump 17 built in a head block 16 of the hydraulic cylinder 14. A motor 18 directly connected to the hydraulic pump 17, a hydraulic control valve group 19 provided near the head block 16, and a control panel 20 for operating a hydraulic circuit provided on the outer peripheral wall of the oil tank 15. It consists of The arrow in the figure indicates the direction of oil flow when the piston rod 21 moves forward.

The hydraulic control valve group 19 and the hydraulic cylinder 14
Of the hydraulic cylinder 14 of the hydraulic unit 13, except that the oil passage 22 for the oil chamber on the piston rod 21 side connecting to the oil chamber 14b on the piston rod 21 side is provided outside the oil tank 15. The hydraulic pump 17 and the oil tank 15 are connected to each other by an oil flow path formed in the cylinder casing 14a portion without using a pipe.
The oil passage 22 for the oil chamber is provided in the oil tank 15
It can also be provided by inserting a pipe-shaped oil channel pipe for an oil chamber therein.

Since the hydraulic unit 13 is integrally provided in the hydraulic cylinder 14 as described above, the apparatus can be made compact, the installation area can be reduced, the electric wiring can be simple and easy, and the pipe joints can be remarkably reduced. Therefore, troubles such as oil leakage can be prevented.

FIG. 4 shows the hydraulic circuit of the embodiment, and FIG.
6 schematically shows the operation of the piston rod 21, and FIG.
6A shows the oil flow when the piston rod 21 moves forward, that is, when the valve body 5 closes, and FIG. 6B shows when the piston rod 21 moves backward, that is, when the valve body 5 opens. The oil flow of each is shown.

In FIG. 5, the vertical axis represents the piston rod 21.
The horizontal axis indicates the time, the symbols A and E indicate the time when the valve body 5 is fully opened, B and C the time when the speed of the piston rod 21 is switched, and D the time when the valve body 2 is fully closed. FIG. 6 (a),
In (b), the arrow indicates the direction of oil flow.

In FIG. 4, the hydraulic cylinder 14 is a single-acting cylinder in which the oil supply port is provided only on the piston rod 21 side toward the oil chamber 14b, and a small diameter of length L is provided at the tip of the oil chamber 14b. The cylinder portion 14s is formed,
A force in the forward direction due to the weight of the weight 6 for automatic valve closing acts on the piston rod 21. In the piston 23,
A small-diameter piston portion 23s having the same length L as the small-diameter cylinder 14s and fitted therein is formed. Solenoid valve 31
The logic circuit 32 and the logic valve 32 form a locking circuit for holding the valve element 5 in the open state, and the solenoid valve 33 and the flow rate adjusting valves 34 and 34a can reduce the forward speed of the piston rod 21. In the first speed reduction circuit, the second speed reduction circuit is formed by the small diameter cylinder portion 14s, the small diameter piston portion 23s, and the flow rate adjustment valve 36 that communicates with the piston rod side oil chamber 14b. The flow rate adjusting valve 34a has a smaller set flow rate than the flow rate adjusting valve 34, and the flow rate adjusting valve 36 further reduces the set flow rate in order to close the valve body 5 at a required final speed. The hydraulic circuit is a differential circuit that allows the oil discharged from one oil chamber to flow into the other oil chamber as the piston rod 21 moves.

In the emergency shut-off standby state shown in FIGS. 1 and 2, that is, in the fully opened state of the valve body 5, the solenoid valve 31 is energized by the detection signal from the abnormality detection device, and the logic valve 3 is activated.
The two flow paths are switched, and the lock that holds the piston rod 21 at the fully opened position of the valve body 5 is released. When this lock is released, the piston rod 21 receives a force in the forward direction by the weight 6 for automatic valve closing, so that the piston rod 21 does not need to be activated even if the hydraulic pump 17 is activated.
6, the piston 23 is pulled in the forward direction, and the oil in the oil chamber 14b on the piston rod 21 side flows.
As shown in (a), the oil flows from the oil chamber oil passage 22 through the oil injection passage 24 provided in the head block 16 into the oil chamber 14c on the piston 23 side, and the piston 23 moves forward together with the piston rod 21. Start. Then, the weight 6 rotates the valve shaft 4 in the valve closing direction of the valve body 5 via the arm 7 under its own weight, and the piston rod 21 connected to the valve shaft 4 via the lever 8 continues to advance (FIG. 5, AB
while).

At this time, in order to prevent the above-described water hammer effect (water hammer) caused by the valve body 5 being rapidly closed, the valve body 5 is placed on the bracket 9 before the valve is closed. By providing a limit switch at a required position, it is possible to detect the intermediate forward position of the piston rod 21, that is, the intermediate opening / closing degree of the valve element 5, and the detection signal causes the flow path of the solenoid valve 33 to flow. 34a side to reduce the oil flow rate flowing into the oil chamber 14c on the piston 23 side.
The forward speed of is slowed (between B and C in FIG. 5).

The small-diameter piston portion 2 of the piston 23
When the tip of 3s reaches the small diameter cylinder portion 14s of the oil chamber 14b on the piston rod side, the oil flowing out from the small diameter cylinder portion 14s to the oil chamber oil passage 22 is shut off, and the oil from the oil chamber 14b is adjusted by the flow rate adjusting valve. Flow path 22 through 36
The flow rate of the piston rod 21 further slows down and the valve is closed (FIG. 5, C-D). The position at which the final forward speed is reduced is the small-diameter cylinder portion 14
s and the length L of the small-diameter piston portion 23s.

As described above, since the first reduction gear circuit and the second reduction gear circuit are incorporated, it is not necessary to separately provide a hydraulic shock absorber. The speed reduction circuit may be either the first speed reduction circuit or the second speed reduction circuit.

By the advance of the piston rod 21,
The total volume in the hydraulic cylinder 14 is the cylinder casing 1
Since the volume of the piston rod 21 protruding from 4a is increased, the amount of oil is insufficient only by moving the oil discharged from the oil chamber 14b on the piston rod 21 side to the oil chamber 14c on the piston 23 side. The shortage of oil passes from the oil tank 15 to the oil chamber 14c on the piston 23 side through the tank-pump oil passage 25 and the oil chamber oil passage 27 on the piston 23 side shown in FIG. 6A. Inflow.

Next, in order to return the valve body 5 from the fully closed state to the fully opened state to the emergency shutoff standby state, the solenoid valve 31 is de-energized by operating the button on the control panel 20, and the logic valve 32 is operated. Is locked and the motor 18 is started to operate the hydraulic pump 17. Figure 6
As shown in (b), when the hydraulic pump 17 built in the head block 16 is operated, oil is discharged from the discharge port 28, and the oil flow for the oil chamber flows from the discharge oil flow passage 29 provided in the head block 16. It flows through the passage 22 into the oil chamber 14b on the piston rod 21 side. Then, the piston 23 is pressed by the inflowing oil, and the piston rod 21 retracts. At this time, the retreat speed of the piston rod 21 is adjusted by adjusting the flow rate adjusting valve 35 (between D and E in FIG. 5).

Due to the retraction of the piston rod 21, the oil filled in the oil chamber 14c on the piston 23 side is
The suction port 26 of the hydraulic pump 17 is pushed by the piston 23 and passes through the oil passage 27 for the oil chamber on the piston 23 side.
Sent to the side. Most of the oil discharged from the oil chamber oil flow passage 27 is generated by the hydraulic pump 17, the discharge oil flow passage 29,
The oil flows through the oil chamber oil passage 22 on the piston rod 21 side and flows into the oil chamber 14 b on the piston rod 21 side.

In the process of retracting the piston rod 21,
The total volume in the hydraulic cylinder 14 is the cylinder casing 1
4a, the volume of the piston rod 21 is reduced by the volume of the piston rod 21. Therefore, a part of the oil discharged from the oil chamber 14c on the piston 23 side is partially formed in the head block 16.
It is returned into the oil tank 15 through the oil passage 25 between pumps.

The oil discharged by the flow rate adjusting valves 34, 34a during the backward movement of the piston rod 21 is returned to the suction port 26 side of the hydraulic pump 17 by the return oil passage 30 provided in the head block 16. Be done.

In this way, the cylinder rod 21
Due to the backward movement of the valve shaft 4, the valve shaft 4 rotates in the valve opening direction of the valve body 5, and at the same time, the arm 7 rotates and the weight 6 returns to the initial position, so that the valve body 5 is fully opened. Then, when the turning position of the arm corresponding to the full opening of the valve body 5, that is, the retracted position of the piston rod 21 is detected by a limit switch (not shown), the hydraulic pump 17 is stopped.
Since the oil passage in the oil chamber 14b on the piston rod 21 side is blocked by the solenoid valve 31 and the logic valve 32, the required pressure in the oil passage is maintained even if the hydraulic pump 17 is stopped. , The fully opened state of the valve body 5 is maintained,
Return to the emergency shutdown standby state. Further, in the unlikely event that an oil leak occurs in the hydraulic control valve group 19 and the required pressure cannot be maintained, the hydraulic pump 17 is automatically activated so that the hydraulic pressure can be returned to the required pressure. It is also possible.

A conventional opening / closing device for fully opening a valve body that has been rapidly closed by a valve body opening / closing mechanism and a locking mechanism incorporated in this hydraulic circuit, and an on / off mechanism for connecting and disconnecting the opening / closing device and the valve shaft. Further, a locking device such as an electromagnetic brake for holding the valve element in a fully opened state is not required, which simplifies the device and contributes to reduction in manufacturing cost.

FIG. 7 shows a hydraulic circuit of another embodiment. As the hydraulic cylinder 14, the piston rod 2 is used.
A double-acting cylinder having ports provided in both the oil chamber 14b on the first side and the oil chamber 14c on the piston 23 side is used, and a 4-port 3-position solenoid valve 41 and a flow control valve 42 at each port.
By providing 43 and operating the solenoid valve 41 to switch the flow path, the piston rod 21 can be moved forward or backward to open or close the valve element 5.

In this way, the cylinder rod 21 can be moved forward and the valve body 5 can be closed without attaching the weight 6. Further, in either case of moving the piston rod 21 forward or backward, the flow rate can be controlled by the flow rate adjusting valve 42 or 43 on the outlet side of the oil chamber 14b or the oil chamber 14c, so that the load fluctuation occurs in the closing or opening process. However, stable speed control of the piston rod 21 is possible.

The hydraulic cylinder 14 is mounted horizontally as shown in FIG. 1 in any of the single-acting cylinder shown in FIG. 4 and the returning cylinder shown in FIG. It can also be mounted vertically or diagonally. When the hydraulic cylinder 14 is mounted in a direction other than the horizontal direction, since the oil is biased in the oil tank 15, the oil flow path to the hydraulic pump 17 is changed to the tank-pump flow path 25 shown in FIG. 6A. In addition to the double-acting cylinder shown in FIG. 7, the oil tank 1
It is desirable to provide a flow path 25a from the end of piston rod 5 on the piston rod 21 side to the hydraulic pump 17. This channel 2
5a can be provided either in the cylinder casing 14a or in a bypass pipe.

[0051]

As described above, according to the emergency shutoff valve device of the present invention, a hydraulic unit such as a hydraulic pump, a hydraulic control valve, an oil tank, and a control panel is provided in the cylinder casing of the hydraulic cylinder for opening and closing the valve body. Since it is integrally provided, the entire device can be made compact. As a result, the installation area can be reduced, and since the electric components are concentrated in one place and are close to the control panel, the electric wiring is simple and short, and the wiring work and maintenance are easy. Since the oil passage is provided in the cylinder casing, the oil tank, the hydraulic pump, the hydraulic control valve, and the piping between the hydraulic cylinders can be substantially omitted, and the risk of oil leakage is eliminated.

Further, in the hydraulic circuit of the hydraulic unit, an opening / closing mechanism for fully opening a fully closed valve body and a fully opened state of the valve body are maintained to ensure normal flow of the pipe line, and, for example, , Lock mechanism that can be in a valve closing standby state such as emergency cutoff of the pipeline in the event of an abnormality, and to prevent water hammer effect (water hammer), switch the rotation speed of the valve element to a slow speed to close the valve By incorporating the hydraulic shock absorbing mechanism, a lock device such as a conventional opening / closing device or an electromagnetic brake is not required, and the device is simplified. As a result, the manufacturing cost can be reduced, and the probability of trouble occurrence can be reduced.

Further, since the valve body opening / closing mechanism can return the valve body from the fully closed state to the fully opened state without using an opening / closing device having a conventional special clutch mechanism, the valve shaft and the opening / closing mechanism can be opened and closed. There is no need for troublesome clutch switching work for disconnecting the device.

[Brief description of drawings]

FIG. 1 is a front view of an emergency shutoff valve device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the above emergency shutoff valve device.

FIG. 3 is a vertical sectional front view of the hydraulic cylinder and the hydraulic unit of the above.

FIG. 4 is a diagram showing a hydraulic circuit of the same.

FIG. 5 is a diagram showing the displacement of the piston rod of the above.

FIG. 6 (a) is an explanatory view showing the flow of oil when the piston rod of the same is advanced, and FIG. 6 (b) is an explanatory view showing the flow of oil when the piston rod of the same is retracted.

FIG. 7 is a diagram showing a hydraulic circuit of another embodiment.

FIG. 8 is a perspective view of a conventional electric emergency shutoff valve.

[Explanation of symbols]

1 Emergency shutoff valve device 1a Emergency shutoff valve 2 valve body 3 valve box 4 valve shaft 5 valve body 6 weights 7 arms 8 levers 9 bracket 10 holder 11 Opening scale 12 guidelines 13 Hydraulic unit 14 hydraulic cylinder 14a Cylinder casing 14b, 14c oil chamber 14s small diameter cylinder 15 oil tank 15a Filling port 16 head blocks 17 Hydraulic pump 18 motor 19 Hydraulic control valve group 20 control panel 21 piston rod 22 Oil channel for oil chamber 23 pistons 23s small diameter piston 24 Oil injection path 25, 25a Oil flow path between tank and pump 26 Suction port 27 Oil channel for oil chamber 28 Discharge port 29 Discharge oil flow path 30 Return oil flow path 31, 33, 41 Solenoid valve 32 logic valve 34, 35, 36, 42, 43 Flow rate adjusting valve 44 shaft reducer 45 Electromagnetic brake 46 bracket 47 holder 48 hydraulic shock absorber 49 clutch 50 Electric switchgear 50a worm shaft 51 handle 52 Manual switchgear 53, 54, 55 electrical wiring 56 control panel 60a, 60b Water pipe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Okawa             1-12-19 Kitahorie, Nishi-ku, Osaka City, Osaka Prefecture             Kurimoto Iron Works Co., Ltd. (72) Inventor Tomio Kubo             2-103 Honjo Nishi, Higashi-Osaka City, Osaka Prefecture             Shimadauchi (72) Inventor Yoshio Murao             1-1 1-1 Kitaeguchi, Higashiyodogawa-ku, Osaka-shi, Osaka             No. Taiyo Iron Works Co., Ltd. (72) Inventor Katsuaki Kamei             1-1 1-1 Kitaeguchi, Higashiyodogawa-ku, Osaka-shi, Osaka             No. Taiyo Iron Works Co., Ltd. F-term (reference) 3H056 AA04 BB02 BB04 BB12 BB32                       BB33 BB46 CA01 CA13 CB02                       CC02 CC17 CD02 CE04 DD01                       DD03 EE08 GG05 GG11                 3H061 AA02 BB06 CC09 CC12 CC23                       DD03 EA04 EB05 EB08 EB10                       EC02 EC18 EC25 FC02 GG02                       GG15

Claims (6)

[Claims] 1. A valve body in which a valve body is rotatably mounted inside a valve box, an arm that rotates in conjunction with a valve shaft of the valve body, and the valve body is attached to the arm and is attached by its own weight. A weight that closes the valve, a hydraulic cylinder that is rotatably connected to the valve shaft, and a hydraulic unit that drives the hydraulic cylinder to open the valve body by linear movement of the piston rod. In the emergency shutoff valve device, the hydraulic cylinder is provided with a hydraulic unit including a hydraulic pump, a drive motor of the hydraulic pump, a hydraulic control valve, and a hydraulic tank, and the hydraulic unit is integrated with the hydraulic cylinder. An emergency shutoff valve device characterized by the above. 2. The emergency shutoff valve device according to claim 1, wherein the hydraulic pump is provided in a head block of a cylinder casing, and the hydraulic tank is provided at an outer peripheral portion of the cylinder casing. 3. The emergency shutoff valve device according to claim 1, wherein the hydraulic cylinder is swingably supported by the valve box. 4. A locking circuit is provided in the hydraulic circuit of the hydraulic unit so as to hold the valve element in the open state unless there is a valve closing signal.
An emergency shutoff valve device according to any one of 1. 5. The emergency shutoff valve device according to claim 1, wherein a deceleration control circuit for decelerating a valve closing speed of the valve body is provided in a hydraulic circuit of the hydraulic unit. 6. The emergency shutoff valve device according to claim 1, wherein a control panel of the hydraulic unit is provided integrally with the hydraulic unit or attached to a cylinder casing of the hydraulic cylinder.