JP2014062622A - Weight type emergency shutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a weight type emergency shutoff valve to be recovered to a stand-by state where detecting earthquake enables a flow passage to be shutoff in emergency through one action after the flow passage is shutoff.SOLUTION: A weight type emergency shutoff valve comprises: a lock mechanism 2 for locking the first arm 14 having a weight fixed thereto at its open position to keep the valve in its opened state; an earthquake detecting mechanism 3 for detecting earthquake while a weight 33 drops from its waiting position due to vibration of earthquake; and a recovery mechanism 4 for returning the weight 33 to its waiting position to recover the earthquake detecting mechanism 3 to a state in which the mechanism 3 can detect earthquake. The weight 33 descends due to vibration of earthquake to cause the lock of the first arm 14 by the lock mechanism 2 to be released and a pivoting action of the first arm 14 toward its closed position causes the valve to be turned to the closed state to shut off the flow passage. The lock mechanism 2 is constituted such that after shutoff of the flow passage, a valve shaft is turned in such a direction as one in which the valve is opened, the first arm 14 is returned back the opened state and recovered to the locked state. The recovery mechanism 4 is cooperated with the lock recovery action of the first arm 14.

Description

  The present invention relates to a weight-type emergency shut-off valve that uses a weight to shut off a flow path when an earthquake is detected.

  The above-described weight-type emergency shut-off valve (hereinafter simply referred to as an emergency shut-off valve) urgently shuts off the flow path by rotating the valve body using its own weight drop when an earthquake is detected. The earthquake detection method of the emergency shut-off valve is roughly classified into an electric signal method for detecting an earthquake by an electric signal of a seismometer and a non-power supply method for detecting an earthquake without using a power source.

  The electric signal type emergency shut-off valve can detect the occurrence of an earthquake quickly and has high reliability. However, if the electric signal system becomes disabled due to a power failure when the earthquake occurs, the flow path cannot be blocked. On the other hand, the emergency shut-off valve of the non-power supply system can cut off the flow path even if a power failure occurs, although it is less rapid than the electric signal system.

  Patent Document 1 discloses a power supply-type emergency shut-off valve. In the emergency shut-off valve of this document, one end of a rotation lever is fixed to the valve shaft of the valve body, and a weight is attached to the other end of the rotation lever. In the standby state, the lock pin locks the rotation lever so as not to rotate due to the weight of the weight, and holds the valve body in the open state.

  The emergency shut-off valve in this document includes an earthquake detection mechanism that detects an earthquake without a power source. The earthquake detection mechanism includes a cradle that supports the ball in the vicinity of the lock pin and a ball receiving member that is connected to the lock pin. When an earthquake occurs, the ball falls from the cradle and is received by the ball receiving member. Then, the occurrence of an earthquake is detected. And when an earthquake is detected in this way, the lock pin is configured to be detached from the rotating lever immediately.

  When the lock pin is detached from the rotation lever, the lock of the rotation lever is released. Then, the rotation lever is rotated by the weight of the weight, whereby the valve body is rotated from the open state to the closed state, and the flow path is blocked.

  In the emergency shut-off valve of this document, as described above, an earthquake is detected and the flow path is shut off urgently.After the flow path is shut off, in order to return to a standby state where the earthquake can be detected again and the flow path can be shut off, The following operations are necessary. First, the ball received by the receiving member is taken out and placed on the cradle so that the earthquake detector can return to the state in which the earthquake can be detected. Then, the handle is further operated to rotate the valve shaft, the valve body is returned to the open state, and the rotating arm is returned to the original position. Then, the rotation lever is locked with a lock pin, returned to the locked state so as not to rotate due to the weight of the weight, and the valve body is held in the open state.

  As described above, the emergency shut-off valves of the non-power supply system including Patent Document 1 have the operation of returning the rotating arm to the locked state so as not to rotate due to the weight of the weight after the flow path is shut off, and the earthquake detection mechanism is an earthquake. It was not possible to return to the standby state unless the operation for returning to a state where it can be detected is performed separately.

  In recent times when earthquakes frequently occur, there is a need for an emergency shut-off valve that can easily return to a standby state after a flow passage is shut off.

JP 09-144951 A

  The problem to be solved by the present invention is to provide a weight-type emergency shut-off valve that can return to a standby state by a single operation after the flow path is shut off.

In order to solve the above-described problems, a weight-type emergency shut-off valve according to the present invention includes a valve shaft that is rotatably supported by a valve box, a closed state that is attached to the valve shaft, blocks the flow path, and releases the flow path. A valve body that rotates between an open state, a first arm that rotates between an open position and a closed position in conjunction with the valve shaft, and a first arm that is provided on the first arm and that is caused by its own weight. , A weight for rotating the arm from the open position to the closed position, a lock mechanism that locks the first arm to the open position and holds the valve element in the open state, and the weight is lowered from the standby position to the sensing position by the vibration of the earthquake And a seismic sensing mechanism that senses the earthquake, and the weight is lowered to the sensing position due to the vibration of the earthquake so that the lock of the first arm by the lock mechanism is released, and the first arm is moved to the closed position by releasing the lock. By rotating, the valve body rotates to the closed state and blocks the flow path. A weight-type emergency shut-off valve that,
The lock mechanism is configured so that the first arm returns to the open position and returns to the locked state by rotating the valve shaft in a direction to open the valve body after the flow path is shut off.
The weight-type emergency shut-off valve further includes a return mechanism that returns the weight to the standby position so that the earthquake detection mechanism can return to a state in which an earthquake can be detected. The return mechanism is interlocked with the lock return operation of the first arm of the lock mechanism. It is characterized by operating.

  Preferably, the lock mechanism includes a first hook provided on the first arm, a lock plate having a notch for engaging the first hook, and rotatably supported, and a lock provided on the lock plate. A lock pin that removably fits in the hole and locks the lock plate so as not to rotate, and the first hook is locked to the notch in a state where the lock pin is fitted in the lock hole and the lock plate is locked. As a result, the first arm is locked in the open position, the lock pin is removed from the lock hole, and the lock plate is unlocked, so that the first arm is unlocked and the first arm is unlocked. Then, the lock plate rotates in the forward direction due to the weight of the weight, and the first hook is lowered so as to come out of the notch.

  Preferably, the lock mechanism includes a lock arm provided with a lock pin on one end side, and the earthquake detection mechanism includes a cam that moves in conjunction with the movement of the weight, and the cam moves when the weight moves to the detection position. However, by depressing the other end side of the lock arm, the lock pin on one end side is lifted and removed from the lock hole, and the lock plate is unlocked.

  Preferably, when the first arm returns to the open position, the first hook moves upward while rotating the lock plate in the opposite direction, so that the lock pin fits into the lock hole and the lock plate is locked. Is locked in the notch, and the lock mechanism returns to the state where the first arm is locked.

  Preferably, the return mechanism includes a return plate rotatably supported, and a first pin and a second pin provided on the return plate, and the lock mechanism includes a second hook provided on the lock plate. When the plate rotates in the opposite direction, the second hook pushes down the second pin to rotate the return plate, and the first pin rises due to the rotation of the return plate and lifts the weight to the standby position. Returns to a state where it can detect earthquakes.

Preferably, a rotation shaft that is rotatably supported, and a second arm that rotates around the rotation shaft and supports a weight, the weight is provided to be movable along the first arm,
When the weight descends, the second arm rotates around the rotation axis, and moves the weight along the first arm in a direction away from the valve shaft.

  In the weight-type emergency shut-off valve according to the present invention, the lock mechanism returns to the state where the first arm is locked in the open position by rotating the valve shaft after shutting off the flow path. Then, in conjunction with the lock return operation of the first arm, the return mechanism for the earthquake detection mechanism operates, and the earthquake detection mechanism returns to a state in which an earthquake can be detected.

  Thus, the emergency shut-off valve returns to a standby state where an earthquake is detected and the flow path can be shut off urgently. That is, the weight type emergency shut-off can be easily returned to the standby state by performing only one operation of rotating the valve shaft.

It is a partial notch front view which shows a weight-type emergency cutoff valve. It is a side view which shows a weight-type emergency cutoff valve. It is a front view which shows the structure of an earthquake detection mechanism, a lock mechanism, and a return mechanism. It is a figure explaining the operation | movement which detects an earthquake and interrupts | blocks a flow path. It is a figure explaining the operation | movement which detects an earthquake and interrupts | blocks a flow path. It is a figure explaining the positional relationship of a lock plate and a 1st hook. It is a figure explaining the operation | movement which returns to a standby state after flow path interruption | blocking. It is a figure explaining the operation | movement which returns to a standby state after flow path interruption | blocking.

  Hereinafter, a weight-type emergency cutoff valve (hereinafter simply referred to as an emergency cutoff valve) according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the emergency shut-off valve 1 is installed in a flow path F through which fluid (for example, water) flows, and shuts off the flow path F when an earthquake is detected. The emergency shut-off valve 1 includes a valve box 10 that forms a part of the flow path F, a valve shaft 11 that is provided so as to penetrate the valve box 10 in an airtight manner, and that is rotatably supported by the valve box 10. 11 and a valve body 12 attached to 11.

  The valve body 12 can rotate between an open state (a state shown in FIG. 1) in which the flow path F is opened and a closed state in which the flow path F is blocked by rotation around the axis of the valve shaft 11. The valve body 12 is a butterfly valve in the present embodiment. A base plate 13 is attached to the valve box 10 in order to arrange each mechanism described later.

  FIG. 2 shows a side view of FIG. The emergency shut-off valve 1 includes a first arm 14 having one end fixed to the valve shaft 11 and a weight 15 provided on the other end side of the first arm 14. The first arm 14 rotates in conjunction with the valve shaft 11. When the first arm 14 rotates about the valve shaft 11, the valve shaft 11 rotates about the shaft, and the valve body 12 of FIG. 1 rotates.

  The first arm 14 is normally located at a position indicated by a solid line in FIG. 2 and is locked by the lock mechanism 2 described later so as not to rotate due to the weight of the weight 15. When the first arm 14 is locked, the valve body 12 is in an open state and the flow path F is opened. Hereinafter, the position of the first arm 14 at this time, that is, the position indicated by the solid line is defined as the open position.

  When the lock of the first arm 14 is released, the weight 15 is lowered by its own weight, and the first arm 14 is lowered from the open position toward the position indicated by the one-dot chain line in FIG. 2 (hereinafter referred to as the closed position). To turn. Thereby, the valve body 12 rotates from the open state to the closed state, and the flow path F is blocked.

  The emergency shut-off valve 1 includes a shock absorber 16 for alleviating an impact when the valve body 12 rotates to the closed state.

  As shown in FIG. 1, the emergency shut-off valve 1 includes a lock mechanism 2 that locks the first arm 14 so as not to rotate from the open position to the closed position due to the weight of the weight 15, and an earthquake detection mechanism 3 that detects an earthquake. . Hereinafter, these configurations will be described with reference to FIG.

  The lock mechanism 2 includes a first hook 20 provided on the first arm 14, a lock plate 22 rotatably supported by the support shaft 21, a lock pin 23 that locks the lock plate 22 so as not to rotate, The lock arm 24 supports the pin 23.

  As shown in FIG. 2, the first hook 20 actually has a shape that is curved in a dogleg shape. The first hook 20 is bolted to the first arm 14 such that when the first arm 14 is in the open position, one side is inclined horizontally and the other side is inclined downward. The horizontal portion of the first hook 20 has a thickness, and the inclined portion is configured to be thinner than the horizontal portion.

  As shown in FIG. 3, the lock plate 22 includes a notch 25 for locking the first hook 20. Further, the lock plate 22 includes a lock hole 26 into which the lock pin 23 is detachably fitted, and a lock release hole 27 formed so as to be connected to the lock hole 26. FIG. 3 shows a state in which the lock pin 23 is fitted in the lock hole 26. The lock release hole 27 is formed in an arc shape centered on the support shaft 21. The lock hole 26 is formed so as to protrude from one end of the lock release hole 27 in the radial direction of a circle centering on the support shaft 21.

  When the lock pin 23 is fitted in the lock hole 26, the lock plate 22 cannot rotate. On the other hand, if the lock pin 23 is in the arc-shaped lock release hole 27, the lock plate 22 can be rotated within the arc angle range of the lock release hole 27 without being restricted by the lock pin 23.

  The lock arm 24 includes a first lock arm 24a, a second lock arm 24b, and a third lock arm 24c. The first lock arm 24a is rotatably supported by the support shaft 28a, the second lock arm 24b is rotatably supported by the support shaft 28b, and the third lock arm 24c is a first lock arm 24a and a second lock arm. 24b is connected. The lock pin 23 is attached to the second lock arm 24b.

  The lock mechanism 2 engages the first hook 20 with the notch 25 when the first arm 14 is in the open position. At this time, the weight of the weight 15 acts on the lock plate 22 via the first arm 14 and the first hook 20, thereby causing the lock plate 22 to rotate. However, the lock plate 22 does not rotate because it is locked by the lock pin 23 being fitted in the lock hole 26. Therefore, in this state, the first arm 14 is locked at the open position so as not to rotate due to the weight of the weight 15, and the valve body 12 is held in the open state.

  The earthquake detection mechanism 3 includes a rotating body 30 that is rotatably supported. A supporting arm 31 and a locking pin 32 are provided on the rotating body 30. A weight 33 is attached to one end of the support arm 31. The weight 33 tries to descend by its own weight. However, since the locking pin 32 is locked to the latch 34 and the rotating body 30 cannot rotate, the weight 33 is held at the position. Hereinafter, the position where the weight 33 is held in this way is referred to as a standby position. A cam 35 is attached to the rotating body 30 and moves in conjunction with the operation of the weight 33.

  Further, the earthquake sensing mechanism 3 includes a pendulum 36 supported by being suspended, a spring 37 provided so as to be able to vibrate up and down, and an actuator 38 for pushing up the latch 34.

  When an earthquake occurs, the pendulum 36 or the spring 37 vibrates due to the vibration of the earthquake. When the vibration of the earthquake exceeds the set value, the actuator 38 is operated by the vibration of the pendulum 36 or the spring 37 and pushes up the latch 34. As a result, the locking pin 32 is unlocked by the latch 34, and the weight 33 is lowered from its standby position to a predetermined position (hereinafter referred to as a sensing position) by its own weight.

  In this way, the earthquake sensing mechanism 3 senses the earthquake by the weight 33 being lowered from the standby position to the sensing position by the earthquake vibration. As is clear from the above, the earthquake detection mechanism 3 can detect an earthquake without a power source without using a seismometer or the like.

  Once the earthquake is detected and the weight 33 is lowered from the standby position to the detection position, the earthquake detection mechanism 3 cannot detect the earthquake unless the weight 33 is returned to the standby position again. Therefore, the emergency shut-off valve 1 includes a return mechanism 4 for returning the weight 33 to the standby position and returning the earthquake detection mechanism 3 to a state where it can detect an earthquake. The return mechanism 4 includes a return plate 41 that is rotatably supported by the support shaft 40, and a first pin 42 and a second pin 43 provided on the return plate 41. The first pin 42 and the second pin 43 are fixed so as to protrude from the return plate 40 on the back surface of the return plate 40. The lock plate 22 is provided with a second hook 29 for operating the return mechanism 4.

[Blocking operation]
The emergency shut-off valve 1 includes the lock mechanism 2, the earthquake detection mechanism 3, and the return mechanism 4. When the earthquake detection mechanism 3 detects an earthquake of a predetermined magnitude or larger, the first arm 14 by the lock mechanism 2 is used. Is unlocked and the flow path F is blocked. The operation will be described below with reference to FIGS. In the following description, clockwise rotation is defined as forward rotation, and counterclockwise rotation is defined as counterclockwise rotation.

  FIG. 4A shows the standby state of the emergency shut-off valve 1 as in FIG. That is, the earthquake detection mechanism 3 is in a state in which an earthquake can be detected, and the lock mechanism 2 locks the first arm 14 in the open position and holds the valve body 12 in the open state.

  When an earthquake of a predetermined magnitude or larger occurs in the standby state, the earthquake detection mechanism 3 detects the earthquake as described above. That is, the weight 33 is lowered from the standby position to the sensing position shown in FIG. 4B. At this time, the weight 33 pushes down the first pin 42 of the return mechanism 4 to rotate the return plate 41 in the opposite direction.

  The cam 35 is lowered in conjunction with the lowering of the weight 33 and pushes down one end side of the lock arm 24. Since the lock arm 24 is rotatably supported by the support shaft 28a, the other end side of the lock arm 24 is raised. At this time, the lock pin 23 attached to the other end side of the lock arm 24 also rises, moves away from the lock hole 26, and moves to the lock release hole 27. Thereby, the lock of the lock plate 22 is released. That is, using the lever principle, the lock pin 23 is released from the lock hole 26 and the lock plate 22 is unlocked.

  The lock plate 22 can receive the weight of the weight 15 by locking the first hook 20 while being locked by the lock pin 23 (the weight 15 can be held so as not to descend). Therefore, when the lock plate 22 is unlocked and can rotate, the lock plate 22 cannot receive the weight of the weight 15.

  Accordingly, the lock plate 22 starts to rotate in the forward direction as shown in FIG. 5A due to the weight of the weight 15, and the locking of the first hook 20 by the notch 25 is released. Then, the first arm 14 starts to rotate downward from the open position toward the closed position due to the weight of the weight 15. That is, the lock of the first arm 14 by the lock mechanism 2 is released.

  The first hook 20 comes out of the notch 25 when the first arm 14 is unlocked. First, as shown in FIGS. 6A to 6C, as the lock plate 22 rotates, the horizontal portion of the first U-shaped hook 20 starts to come out of the notch 25. Subsequently, as shown in FIGS. 6D to 6F, the inclined portion of the first hook 20 comes out of the notch 25 while pushing down the lock plate 22.

  As shown in FIG. 5B, the lock plate 22 rotates until the lock pin 23 moves to and comes into contact with the end of the lock release hole 27. At this time, the notch 25 faces obliquely downward. When the lock plate 22 rotates in the forward direction, the second hook 29 pushes away the second pin 43 as shown in FIG. 5A and comes out of the second pin 43 as shown in FIG. 5B.

  The first hook 20 is completely separated from the lock plate 22, and the first arm 14 is rotated to the closed position by the weight of the weight 15. As a result, the valve body 12 is closed and the flow path F is blocked.

[Return operation]
Next, an operation of returning to a standby state in which the emergency shut-off valve 1 senses an earthquake and can shut off the flow path F after shutting off the flow path F as described above will be described.

  As shown in FIG. 1, the emergency shut-off valve 1 includes a handle 5 as a rotating means for rotating the valve shaft 11. By operating the handle 5, the valve shaft 11 can be rotated in a direction to open the valve body 12.

  When the valve shaft 11 is rotated by the handle 5, the valve body 12 rotates from the closed state to the open state, and the first arm 14 fixed to the valve shaft 11 resists the weight of the weight 15 from the closed position to the open position. Pivot upward. As a result, as shown in FIG. 7A, the first hook 14 also rotates and rises, and is inserted into a notch 25 facing obliquely downward to rotate the lock plate 22 in the opposite direction. That is, contrary to the blocking operation, the inclined portion of the first hook 20 enters the notch 25 while rotating the lock plate 22 in the opposite direction in the order of FIGS. 6F to 6D.

  Thus, when the lock plate 22 rotates in the opposite direction, the second hook 29 that is positioned above the second pin 43 during the blocking operation is hooked on the second pin 43 (FIG. 7A).

  Further, when the lock plate 22 rotates in the opposite direction, as shown in FIG. 7B, the second hook 29 rotates the return plate 41 in the forward direction by pushing down while moving the second pin 43 along the inner side. . The first pin 42 is lifted by the positive rotation of the return plate 41, and lifts the weight 33 from the sensing position (FIGS. 7A and 7B).

  Further, when the first pin 42 moves up, the weight 33 returns to the standby position as shown in FIG. 8A. At this time, the locking pin 32 of the rotating body 30 is hooked on the latch 34, and the weight 33 is held at the standby position. That is, the earthquake detection mechanism 3 returns to a state in which an earthquake can be detected.

  Further, when the lock plate 22 rotates, as shown in FIG. 8B, the lock pin 23 fits into the lock hole 26 and is locked so as not to rotate. At this time, as shown in FIG. 6A, the first hook 14 returns to the state where the vertical portion is inserted into the notch 25, and the first arm 14 returns to the open position. The first hook 20 is engaged with the notch 25, and the lock plate 22 receives the weight of the weight 15 so that the first arm 14 does not rotate due to the weight of the weight 15. That is, the lock mechanism 2 returns to the state where the first arm 14 is locked in the open position. As a result, the emergency shut-off valve 1 is completely returned to the standby state. The second pin 43 returns to the original position through the inside of the second hook 29 (FIG. 8B).

  Thus, the emergency shut-off valve 1 returns to the state where the lock mechanism 2 locks the first arm 14 by rotating the valve shaft 11, and the return mechanism 4 is interlocked with this return operation. The seismic sensing mechanism 3 returns to a state where it can sense an earthquake. That is, the emergency shut-off valve 1 can be easily returned to the standby state simply by operating the handle 5.

[Double arm]
The emergency shutoff valve 1 has a configuration in which a weight 15 is provided on the first arm 14 and the flow path F is shut off by rotating the first arm 14 by the weight of the weight 15. As shown in FIG. 2, the emergency shutoff valve 1 may include a second arm 17 in addition to the first arm 14. Hereinafter, a configuration of a double arm including the first arm 14 and the second arm 17 will be described.

  A weight moving hole 14a having a predetermined length is formed along the longitudinal direction at the end of the first arm 14 opposite to the valve shaft 11. The weight 15 is provided on the first arm 14 so as to be movable along the weight moving hole 14a.

  A rotating shaft 18 parallel to the valve shaft 11 is rotatably supported on the base plate 13. One end of the second arm 17 is fixed to the rotary shaft 18 and can be rotated around the rotary shaft 18. A weight 15 is attached to the other end of the second arm 17.

  The emergency shut-off valve 1 supports the weight 15 with a double arm structure including a first arm 14 and a second arm 17. As a result, the weight holding force acting on the lock plate 22 (lock pin 23) of the lock mechanism 2 is reduced.

  As shown in FIG. 2, when the first arm 14 is in the open position, the weight 15 is located at the lower end of the weight moving hole 14 a and is close to the valve shaft 11. That is, the moment around the valve shaft 11 due to the weight of the weight 15 is small. This also reduces the weight holding force acting on the lock plate 22.

  When the earthquake detection mechanism 3 detects an earthquake and the lock of the first arm 14 by the lock mechanism 2 is released, the first arm 14 rotates downward from the open position to the closed position due to the weight of the weight 15. At this time, the second arm 17 also rotates around the rotation shaft 18 by the weight of the weight 15. The second arm 17 rotates around a different axis from the first arm 14 to move the weight 15 along the weight moving hole 14a of the first arm 14 in a direction away from the valve shaft 11 (see FIG. 2). (See dashed line).

  As shown by the alternate long and short dash line in FIG. 2, when the first arm 14 and the second arm 17 are rotated to the closed position and restricted by the stopper 19, that is, when the valve body 12 is closed, the weight 15 Reaches the end of the first arm 14, and the distance between the valve shaft 11 and the weight 15 becomes the longest.

  Therefore, when the valve body 12 is in the closed state and the flow path F is blocked, the moment around the valve shaft 11 acting on the valve body 12 is the largest due to the weight of the weight 15, and the valve body 12 flows. The force for blocking the path F is increased.

  When the valve shaft 11 is rotated by the handle 5, the second arm 17 is also rotated and raised together with the first arm 14, whereby the weight 15 moves along the weight moving hole 14a and returns to the original position. The distance between the weight 15 and the valve shaft 11 is the shortest.

  As mentioned above, although preferred embodiment of this invention was described, the structure of this invention is not limited to this embodiment naturally.

  The emergency shutoff valve 1 may include a flow flap flow path detection mechanism in addition to the earthquake detection mechanism 3. The flow flap flow path detection mechanism detects an abnormality in the velocity of the fluid flowing through the flow path F without a power source. For example, when the flow flap flow path detection mechanism detects an abnormality in the fluid velocity, a cam provided separately from the cam 35 in FIG. 3 pushes down the lock arm 24 and the lock pin 23 is released from the lock hole 26 to lock The first arm 14 may be unlocked by the mechanism 2. Thereby, the reliability of the action | operation of the emergency shut-off valve 1 at the time of an unexpected disaster improves.

  The emergency shut-off valve 1 may also have an electric signal system configuration in addition to the above-described configuration of the non-power source system. That is, the emergency shut-off valve 1 also includes a seismometer and / or a flow meter, and by these electrical signals, the lock pin 23 is detached from the lock hole 26 so that the lock of the first arm 14 by the lock mechanism 2 is released. You may comprise. By using both the non-power supply method and the electric signal method in combination, the reliability of the operation of the emergency shut-off valve 1 at the time of an unexpected disaster is further improved.

  Moreover, in the said embodiment, although the emergency shut-off valve 1 comprised the rotation means for rotating the valve shaft 11 with the handle 5, another structure may be sufficient. For example, the rotating means may include a motor that rotates the valve shaft 11 in a direction in which the valve body 12 is opened, and the motor may be driven by remote operation. With this configuration, the emergency shut-off valve 1 can be returned to the standby state only by a remote operator driving the motor by remote control. Therefore, unlike the case of the handle 5, the emergency cutoff valve 1 can be returned to the standby state without the operator going to the place where the emergency cutoff valve 1 is installed.

DESCRIPTION OF SYMBOLS 1 Weight type emergency shut-off valve 10 Valve box 11 Valve shaft 12 Valve body 14 First arm 15 Weight 17 Second arm 18 Rotating shaft 2 Lock mechanism 20 First hook 22 Lock plate 23 Lock pin 24 Lock arm 25 Notch 26 Lock hole 29 Second hook 3 Earthquake detection mechanism 33 Weight 4 Return mechanism 41 Return plate 42 First pin 43 Second pin

Claims (6)

A valve shaft rotatably supported by a valve box; a valve body attached to the valve shaft and rotating between a closed state that blocks a flow path and an open state that releases the flow path; and the valve shaft A first arm that rotates between an open position and a closed position in conjunction with the weight, a weight that is provided on the first arm and that rotates the first arm from the open position to the closed position by its own weight; A lock mechanism that locks the first arm in the open position and holds the valve body in the open state; and an earthquake detection mechanism that detects an earthquake by a weight falling from a standby position to a detection position due to an earthquake vibration; With
The first arm is unlocked by the lock mechanism when the weight is lowered to the sensing position due to the vibration of the earthquake, and the valve body is moved by rotating the first arm to the closed position by unlocking. A weight-type emergency shut-off valve that turns to the closed state and shuts off the flow path,
The lock mechanism is configured so that, after the passage of the flow path, the valve shaft is rotated in a direction to open the valve body in the open state, so that the first arm returns to the open position and returns to the lock state. Configured,
The weight-type emergency shut-off valve further includes a return mechanism that returns the weight to the standby position so that the earthquake detection mechanism can return to a state in which an earthquake can be detected, and the return mechanism includes the first arm of the lock mechanism. A weight-type emergency shut-off valve that operates in conjunction with the lock recovery operation of The lock mechanism includes a first hook provided on the first arm, a lock plate having a notch for engaging the first hook, and rotatably supported. The lock mechanism is provided on the lock plate. A lock pin that removably fits in the lock hole and locks the lock plate so as not to rotate,
In a state where the lock pin fits into the lock hole and the lock plate is locked, the first hook is locked to the notch so that the first arm is locked in the open position,
The lock of the first arm is released by releasing the lock pin and releasing the lock of the lock plate from the lock hole,
2. The lock plate according to claim 1, wherein when the first arm is unlocked, the lock plate rotates in a forward direction due to the weight of the weight, and the first hook is lowered so as to come out of the notch. The weight type emergency shut-off valve described in 1. The lock mechanism includes a lock arm provided with the lock pin on one end side,
The earthquake detection mechanism includes a cam that moves in conjunction with the movement of the weight,
When the weight moves to the sensing position, the cam pushes down the other end side of the lock arm, thereby raising the lock pin on the one end side and releasing it from the lock hole. The weight type emergency shut-off valve according to claim 2, wherein the lock is released.   When the first arm returns to the open position, the first hook moves up while rotating the lock plate in the opposite direction, so that the lock pin fits into the lock hole and the lock plate is locked. 4. The weight-type emergency shut-off valve according to claim 2, wherein the first hook is engaged with the notch, and the lock mechanism returns to a state in which the first arm is locked. The return mechanism includes a return plate rotatably supported, and a first pin and a second pin provided on the return plate,
The lock mechanism includes a second hook provided on the lock plate;
When the lock plate rotates in the opposite direction, the second hook pushes down the second pin to rotate the return plate, and the first pin rises due to the rotation of the return plate to lift the weight. 5. The weight-type emergency shut-off valve according to claim 4, wherein the seismic sensing mechanism returns to a state in which an earthquake can be sensed by lifting to a standby position. A rotation shaft that is rotatably supported, and a second arm that rotates around the rotation shaft and supports the weight,
The weight is provided to be movable along the first arm,
When the weight descends, the second arm rotates around the rotation shaft and moves the weight along the first arm in a direction away from the valve shaft. The weight-type emergency shut-off valve according to any one of claims 1 to 5.

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