JP2015169245A - Weight type emergency shutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight type emergency shutoff valve capable of sensing both earthquake and irregular flow speed under no power source.SOLUTION: An emergency shutoff valve 1 comprises a valve shaft 11 rotatably supported at a valve case 10; a valve body fixed to the valve shaft 11 and rotated in the valve case 10; an oscillation arm 13 fixed to the valve shaft 11 and oscillated between an open position where the valve body releases a flow passage and a closed position where the valve body closes the flow passage; a weight 15 for biasing the oscillation arm 13 by gravity force from the opened position to the closed position; a lock mechanism 2 for locking the oscillation arm 13 at the opened position against the gravity force; a non power source type earthquake sensing mechanism 3 for releasing a locked state of the oscillation arm 13 by the lock mechanism 2 when occurrence of earthquake is sensed; and a non power source type flow speed sensing mechanism 5 for sensing under no power that a flow speed of fluid flowing in the flow passage becomes more than a prescribed value and releasing the locked state of the oscillation arm 13 by the lock mechanism 2 when the flow speed more than the prescribed value is sensed.

Description

  The present invention relates to a weight-type emergency shut-off valve that senses both an earthquake and a flow velocity abnormality with no power source.

  A weight-type emergency shut-off valve can be used to shut off the flow path by moving the valve body with a weight when an occurrence of an earthquake is detected without a power supply (Patent Document 1) When detected, there is an emergency that shuts off the flow path by moving the valve body with a weight (Patent Document 2).

  However, the conventional weight-type emergency shut-off valve only detects either an earthquake or an abnormal flow velocity without a power supply, and cannot detect both an earthquake and an abnormal flow velocity without a power supply.

Japanese Patent Laid-Open No. 9-144941 JP 2005-172074 A

  Therefore, the problem to be solved by the present invention is to provide a weight type emergency shut-off valve that can detect both an earthquake and an abnormal flow velocity with no power source.

  In order to solve the above problems, a weight-type emergency shutoff valve according to the present invention includes a valve box installed in a flow path, a valve shaft rotatably supported by the valve box, and attached to the valve shaft. A valve body that rotates so as to open and shut off the flow path, and a valve body that is attached to the valve shaft so as to interlock with the rotation of the valve body. A swing arm that swings between a closed position that shuts off the flow path, a weight that is attached to the swing arm and biases the swing arm from the open position to the closed position by gravity, and A lock mechanism that locks the swing arm in the open position against gravity, and that the occurrence of an earthquake is detected with no power supply, and when the occurrence of an earthquake is detected, the lock mechanism is used to lock the swing arm. Power-free earthquake sensing mechanism to be released, and the flow path A non-power-supply type flow rate sensing mechanism that senses that the flow rate of the fluid to be flowed exceeds a predetermined value without a power source, and releases the lock of the swing arm by the lock mechanism when the flow rate exceeding the predetermined value is sensed. It is characterized by providing.

Preferably, the lock mechanism includes a hook provided on the swing arm, a lock plate formed with a locking notch and a lock hole, and rotatably supported, and a lock pin provided on one end side. A lock arm supported so that the lock pin is fitted in the lock hole, and the hook is locked to the locking notch in a state where rotation of the lock plate is restricted. The swing arm is locked in the open position;
The earthquake sensing mechanism includes a weight that descends from a standby position to a sensing position due to an earthquake vibration, and a first interlocking member that is disposed above the other end of the lock plate and interlocks with the movement of the weight, When the weight is lowered to the sensing position, the first interlocking member pushes down the other end side of the lock plate to release the lock pin on the one end side from the lock hole. Unlock the arm,
The flow rate sensing mechanism is disposed above the other end side of the lock plate and a pressure receiving portion disposed in the flow path so as to move when receiving the flow velocity greater than or equal to the predetermined value. A second interlocking member that interlocks with movement,
When the pressure receiving portion moves, the second interlocking member pushes down the other end side of the lock plate to disengage the lock pin on the one end side from the lock hole, thereby locking the swing arm. Is released.

  By providing the above configuration, the present invention can provide a weight type emergency shut-off valve that senses both earthquakes and abnormal flow velocities without a power source.

It is a front view of a weight type emergency shut-off valve. It is a side view of a weight-type emergency cutoff valve. It is a figure for demonstrating operation | movement of the rocking | swiveling arm of a weight-type emergency cutoff valve. It is a figure which shows the structure of a lock mechanism, an earthquake detection 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 an earthquake detection mechanism after flow path interruption | blocking. It is a figure explaining the operation | movement which returns an earthquake detection mechanism after flow path interruption | blocking. 10A is a plan view of a portion including a pressure receiving portion (flap) of the flow velocity sensing mechanism, and FIG. 10B is a front view of the flow velocity sensing mechanism of FIG. 10A. It is a side view of the part interlock | cooperated with operation | movement of the pressure receiving part of a flow-path sensing mechanism.

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

  Referring to FIGS. 1 and 2, the emergency shut-off valve 1 urgently shuts off the flow path F when an earthquake occurs or when the flow rate of fluid (water in this embodiment) exceeds a predetermined value. Is. The emergency shut-off valve 1 includes a valve box 10 installed in the flow path F. The interior of the valve box 10 forms part of the flow path F. As shown in FIG. 2, the upstream and downstream sides of the emergency shutoff valve 1 in the flowing water direction Y are connected to pipes P <b> 1 and P <b> 2 that constitute the flow path F, respectively.

  The valve shaft 11 is rotatably supported by the valve box 10 and penetrates the valve box 10. A valve body 12 (FIG. 1) is disposed inside the valve box 10. The valve body 12 is a butterfly valve. The valve body 12 is attached to the valve shaft 11 and rotates by the rotation of the valve shaft 11. The valve body 12 rotates around the valve shaft 11 to contact the valve seat formed inside the valve box 10 to shut off the flow path F, and away from the valve seat to open the flow path F. To do. FIG. 1 shows a state in which the valve body 12 opens the flow path F.

  As shown in the side view of FIG. 3, the emergency shut-off valve 1 includes a swing arm 13 outside the valve box 10. The swing arm 13 is attached to the valve shaft 11 at one end thereof and interlocks with the valve body 12. The swing arm 13 swings around the valve shaft 11 between a solid line position and a one-dot chain line position. When the swing arm 13 is in the solid line position, the valve body 12 opens the flow path F. Hereinafter, the solid line position of the swing arm 13 is referred to as an open position.

  When the swing arm 13 swings to the one-dot chain line position, the valve body 12 rotates in the closing direction in conjunction with the swing, and contacts the valve seat to block the flow path F. Hereinafter, the one-dot chain line position of the swing arm 13 is defined as a closed position. The swing arm 13 is in contact with the stopper 14 when in the closed position.

  A weight 15 is attached to the side of the swing arm 13 opposite to the valve shaft 11. The weight 15 urges the swing arm 13 from the open position to the closed position by its weight. The swing arm 13 tries to swing from the open position to the closed position by gravity (that is, the weight of the swing arm 13 itself and the weight of the weight 15), but is locked at the open position by the lock mechanism 2 described later. .

  The swing arm 13 is provided with an auxiliary arm 16. One end of the auxiliary arm 16 is attached to the rotating shaft 17 and swings around the rotating shaft 17. The rotary shaft 17 is parallel to the valve shaft 11 and is provided at a position away from the valve shaft 11. A weight 15 is attached to the other end of the auxiliary arm 16. On the other end side of the swing arm 13, a moving hole 13a extending in the length direction of the swing arm 13 is formed, and the weight 15 is movable along the moving hole 13a.

  As shown in FIG. 3, when the swing arm 13 is in the open position, the weight 15 is located at the end of the moving hole 13a close to the valve shaft 11. By bringing the weight 15 close to the valve shaft 11, the moment around the valve shaft 11 due to the weight of the weight 15 is reduced, and this is necessary for the lock mechanism 2 described later to lock the swing arm 13 in the open position. The power is reduced.

  When the swing arm 13 swings to the closed position due to gravity and rotates the valve body 12 in the closing direction, the auxiliary arm 16 swings around the rotation shaft 17 different from the valve shaft 11, so that the weight 15 Is moved along the moving hole 13a to be separated from the valve shaft 11. That is, the auxiliary arm 16 increases the moment around the valve shaft 11 due to the weight of the weight 15. When the swing arm 13 is in the closed position and the valve body 12 blocks the flow path F, the weight 15 is at the end of the moving hole 13a on the side away from the valve shaft 11. Thereby, the force with which the valve body 12 blocks the flow path F is increased.

  The emergency shut-off valve 1 includes a shock absorber 18 for reducing an impact when the valve body 12 rotates in the closing direction, and a handle 19 (FIG. 1) for rotating the valve shaft 11.

  The lock mechanism 2 is for releasably locking the swing arm 13 that is about to swing to the closed position by gravity in the open position.

  FIG. 4 shows a front view of the lock mechanism 2. The lock mechanism 2 includes a first hook 20 provided on the swing arm 13, a lock plate 22 rotatably supported on a support shaft 21, a lock pin 23 that locks the lock plate 22 so as not to rotate, and one end. It is comprised with the lock arm 24 which supports the lock pin 23 by the side.

  As shown in FIG. 3, the first hook 20 is shaped like a dogleg when viewed from the side, and is bolted to the swing arm 13.

  As shown in FIG. 4, the lock plate 22 has a locking notch 25 into which the first hook 20 is inserted. Further, the lock plate 22 is formed with a lock hole 26 into which the lock pin 23 is detachably fitted, and a lock release hole 27 for moving the lock pin 23 that has come out of the lock hole 26. FIG. 4 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, and the lock hole 26 is formed so as to extend from one end of the lock release hole 27 in the radial direction of the circle centering on the support shaft 21. Has been.

  The lock arm 24 includes a first lock arm 241, a second lock arm 242, and a third lock arm 243. The first lock arm 241 is rotatably supported on the support shaft 24a, the second lock arm 242 is rotatably supported on the support shaft 24b, and the third lock arm 243 includes the first and second lock arms 241, 242 are connected. The lock pin 23 is attached to the second lock arm 242.

  When the swing arm 13 is in the open position, the first hook 20 of the swing arm 13 is inserted into the locking notch 25. The swing arm 13 tries to swing to the closed position by gravity, but is held in the open position by the first hook 20 being locked to the locking notch 25. At this time, the weight of the swing arm 13 and the weight 15 acts on the lock plate 22 to rotate the lock plate 22, but the lock pin 23 is fitted in the lock hole 26. Rotation is regulated. Therefore, the swing arm 13 does not swing to the closed position. Thus, the lock mechanism 2 locks the swing arm 13 in the open position against the force of gravity, whereby the state in which the valve body 12 opens the flow path F is maintained.

  Furthermore, the emergency shut-off valve 1 includes an earthquake detection mechanism 3 that detects the occurrence of an earthquake. 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 the tip of the support arm 31. Although the weight 33 tends to descend due to gravity, the weight 33 is held in this position because the locking pin 32 is locked to the latch 34 and the rotating body 30 cannot rotate. Hereinafter, the position where the weight 33 is held in this way is referred to as a standby position. A cam 35 (first interlocking member) is attached to the rotating body 30 and moves in conjunction with the operation of the weight 33. The cam 35 is located above the first lock arm 241 of the lock arm 24 and is located on the opposite side to the lock pin 23.

  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, both or one of the pendulum 36 and 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. Thereby, the locking pin 32 is unlocked by the latch 34, and the weight 33 is lowered from the 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 to 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. The first pin 42 is located immediately below the weight 33, and the second pin 43 is located in the vicinity of the second hook 29.

  Next, referring to FIG. 5 to FIG. 6, the earthquake detection mechanism 3 detects an earthquake with no power supply as described above, unlocks the swing arm 13 by the lock mechanism 2, and the valve body 12 flows. An operation for blocking the path F will be described. In the following description, clockwise rotation is defined as forward rotation, and counterclockwise rotation is defined as counterclockwise rotation.

  FIG. 5A is the same view as FIG. FIG. 5A shows a state where the earthquake detection mechanism 3 can detect an earthquake, and the lock mechanism 2 locks the swing arm 13 in the open position. In FIG. 5A, when an earthquake of a predetermined magnitude or larger occurs, the weight 33 is lowered from the standby position to the sensing position shown in FIG. 5B as described above. 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. The lock arm 24 rotates around the support shaft 24a, and the lock pin 23 attached to the other end side of the lock arm 24 rises.

  As a result, the lock pin 23 leaves the lock hole 26 and moves to the lock release hole 27. Thereby, the rotation restriction of the lock plate 22 is released, and the lock plate 22 can be rotated within a range defined by the lock release hole 27. When the rotation restriction is released, the lock plate 22 cannot receive the weights of the swing arm 13 and the weight 15, and the lock by the lock notch 25 of the first hook 20 is released.

  That is, the rocking arm 13 is unlocked by the lock mechanism 2. Then, as shown in FIG. 6A, the swing arm 13 starts swinging from the open position to the closed position due to its own weight and the weight of the weight 15.

  When the swing arm 13 swings to the closed position, the first hook 20 attached to the swing arm 13 moves out of the locking notch 25 while rotating the lock plate 22 in one direction. First, as shown in FIGS. 7A to 7C, as the lock plate 22 rotates, one part of the first U-shaped hook 20 starts to come out of the locking notch 25. Subsequently, as shown in FIGS. 7D to 7F, the other part of the first hook 20 comes out of the locking notch 25 while further pushing down the lock plate 22.

  The first hook 20 is completely separated from the lock plate 22, and the swing arm 13 swings to the closed position. As a result, the valve body 12 blocks the flow path F.

  The lock plate 22 rotates until the lock pin 23 contacts the end of the lock release hole 27 as shown in FIG. 6B. When the lock plate 22 rotates in the forward direction, as shown in FIG. 6A, the second hook 29 pushes away the second pin 43, and the release plate 41 further rotates in the opposite direction. Then, as shown in FIG. 6B, the release plate 41 is reversed in the forward direction until the first pin 42 contacts the weight 33, and the second pin 43 is positioned below the second hook 29.

  The above is the operation when the flow path F is shut off urgently. Next, the operation of rotating the valve shaft 11 to return the swing arm 13 to the locked position again and operating the return mechanism 4 in conjunction with the return operation will be described.

  After the emergency shut-off valve 1 shuts off the flow path F, when the valve shaft 11 is rotated by operating the handle 19 shown in FIG. 1, the swing arm 13 is swung from the closed position to the open position. The valve body 12 can be rotated in the opening direction.

  When the swing arm 13 swings from the closed position to the open position against the weight of the weight 15, as shown in FIG. 8A, the first hook 20 is inserted into the locking notch 25 facing obliquely downward. Then, the lock plate 22 is rotated in the opposite direction. That is, contrary to the blocking operation, the first hook 20 enters the locking notch 25 while rotating the lock plate 22 in the opposite direction in the order of FIGS. 7F to 7A.

  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. 8A).

  Further, when the lock plate 22 rotates in the opposite direction, as shown in FIG. 8B, the second hook 29 rotates the return plate 41 in the forward direction by pushing down while moving the second pin 43 along the lower side. Let 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. 8A and 8B).

  Further, when the first pin 42 moves up, the weight 33 returns to the standby position as shown in FIG. 9A. 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. 9B, the lock pin 23 is fitted into the lock hole 26, and the rotation of the lock plate 22 is restricted. At this time, the swing arm 13 has returned to the open position, and the first hook 20 is inserted into the locking notch 25 and locked. That is, the lock mechanism 2 returns to the state where the swing arm 13 is locked in the open position.

  Thus, the emergency shut-off valve 1 returns to the state where the lock mechanism 2 locks the swing arm 13 in the open position by rotating the valve shaft 11. Then, the return mechanism 4 operates in conjunction with the return operation, and the earthquake detection mechanism 3 returns to a state in which an earthquake can be detected.

  Further, as shown in FIG. 2, the emergency shut-off valve 1 includes a flow rate sensing mechanism 5 that senses that the flow rate of the fluid flowing through the flow path F has reached a certain level. The flow velocity sensing mechanism 5 includes a main body 50 that forms a part of the flow path F inside. The main body 50 has an inflow side connected to the pipe line P <b> 1 and an outflow side connected to the valve box 10.

  The details of the flow velocity sensing mechanism 5 will be described with reference to FIGS. 10A and 10B. The flow velocity sensing mechanism 5 includes a flap 51 (pressure receiving portion) disposed in the main body 50 in order to sense that the flow velocity has reached a certain level. The flap 51 is supported by the lower end of a spindle 52 that extends in the vertical direction. The spindle 52 passes through the main body 50 and is supported by the main body 50 so as to be rotatable around the vertical axis.

  Referring to FIG. 10A, a first arm 531, a second arm 532, and a third arm 533 extending from the center of the spindle 52 in the radial direction of the spindle 52 are provided at the upper end of the spindle 52. . Further, a spring 54 (FIG. 10B) as an urging means for urging the flap 51 is accommodated in the spring case 55 in a compressed state.

  An adjustment bolt 56 is provided on one end side of the spring 54, and the spring 54 is compressed in the spring case 55. A biasing rod 57 is provided on the other end side of the spring 54, and the pin 531 a at the tip of the first arm 531 is biased by the biasing force of the spring 54. The spindle 52 tries to rotate around the axis, but the rotation is restricted because the second arm 532 is in contact with the stopper 58. Thereby, the flap 51 is biased in the direction opposite to the flowing water direction Y.

  One end of a long transmission rod 59 is attached to the tip of the third arm 533. FIG. 11 discloses a configuration on the other end side of the transmission rod 59 of the flow velocity sensing mechanism 5. The other end of the transmission rod 59 is located on the back side of the plate 60 that supports the lock mechanism 2, the earthquake detection mechanism 3, and the return mechanism 4 of FIG. 4. A connection joint 61 is provided to connect the transmission rod 59 and the spacer 62. Further, an L-shaped hook 63 (second transmission member) is rotatably attached to a base 64 fixed to the back surface of the plate 60 via a support shaft 65. The L-shaped hook 63 includes a one-piece portion 631 and another side portion 632, and a support shaft 65 is inserted into these joint portions. The one piece 631 is attached to the spacer 62.

  4 and 11, the other side 632 of the L-shaped hook 63 is inserted into the opening 64 formed in the plate 60, and the lock arm 24 (first arm 241) of the lock mechanism 2 is inserted. Is located above.

  Next, referring to FIG. 10 and FIG. 11, the flow velocity sensing mechanism 5 senses a flow velocity abnormality with no power supply, unlocks the swing arm 13 by the lock mechanism 2, and the valve body 12 moves through the flow path F. A configuration for blocking will be described.

  First, as shown in FIG. 10, when the flow velocity in the flow path F becomes a certain value or more, the force of the fluid acting on the flap 51 becomes larger than the urging force of the spring 54, and the flap 51 moves. As a result, the spindle 52 rotates and the transmission rod 59 attached to the third arm 533 moves linearly. The magnitude of the flow velocity when the flap 51 starts to move can be adjusted by changing the compression amount of the spring 54 by the adjustment bolt 56.

  Next, as shown in FIG. 11, the spacer 62 and the L-shaped hook 63 are rotated around the support shaft 65 by the movement of the transmission rod 59 (see the one-dot chain line). In this way, the L-shaped hook 63 (second interlocking member) moves in conjunction with the movement of the flap 51 (pressure receiving portion), so that it can be sensed that the flow velocity has become a certain level or more without power.

  Next, as shown in FIGS. 4 and 11, when the L-shaped hook 63 rotates around the support shaft 65, the other side portion 632 held in the horizontal state descends and pushes one end side of the lock arm 24. Lower Then, the other end side of the lock arm 24 is raised, and the lock pin 23 supported by the lock arm 24 moves away from the lock hole 26 to the lock release hole 27. Accordingly, as described above with reference to FIGS. 5 and 6, the lock arm 13 is unlocked by the lock mechanism 2, and the swing arm 13 swings from the open position to the closed position due to gravity, and the valve body 12 flows. Block F.

  In this way, the flow rate sensing mechanism 5 senses that the flow rate has become a certain level or higher and releases the lock of the swing arm 13 so that the flow path F is urgently shut off.

  As described above, the emergency shut-off valve 1 senses both an earthquake and a flow velocity abnormality with no power supply, and shuts off the flow path F urgently. The present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 Weight type emergency shut-off valve 10 Valve box 11 Valve shaft 12 Valve body 13 Swing arm 15 Weight 2 Lock mechanism 20 First hook 22 Lock plate 23 Lock pin 24 Lock arm 25 Lock notch 26 Lock hole 3 Earthquake detection mechanism 33 Weight 35 cam (second interlocking member)
4 Return mechanism 5 Flow rate sensing mechanism 51 Flap (pressure receiving part)
63 L-shaped hook (second interlocking member)

Claims (2)

A valve box installed in the flow path;
A valve shaft rotatably supported by the valve box;
A valve body attached to the valve stem and rotating to open and shut off the flow path;
A swing arm attached to the valve shaft so as to interlock with the rotation of the valve body, and swinging between an open position where the valve body opens the flow path and a closed position where the valve body blocks the flow path When,
A weight attached to the swing arm and biasing the swing arm from the open position to the closed position by gravity;
A lock mechanism that locks the swing arm in the open position against gravity;
A non-power-source type earthquake sensing mechanism that senses the occurrence of an earthquake with no power source and unlocks the swing arm by the lock mechanism when the occurrence of an earthquake is sensed;
A non-power-source type that senses that the flow velocity of the fluid flowing through the flow path has become a predetermined value or more, and releases the lock of the swing arm by the lock mechanism when the flow velocity of the predetermined value or more is sensed. A flow rate sensing mechanism;
A weight-type emergency shut-off valve comprising: The locking mechanism is
A hook provided on the swing arm;
A locking plate formed with a locking notch and a locking hole and rotatably supported;
A lock pin provided on one end side and rotatably supported by a lock arm;
When the lock pin is fitted in the lock hole and the rotation of the lock plate is restricted, the hook is locked to the locking notch so that the swing arm is locked in the open position. ,
The earthquake sensing mechanism is
A weight that falls from the standby position to the sensing position due to the vibration of the earthquake,
A first interlocking member disposed above the other end of the lock plate and interlocking with the movement of the weight;
When the weight is lowered to the sensing position, the first interlocking member pushes down the other end side of the lock plate to release the lock pin on the one end side from the lock hole. Unlock the arm,
The flow rate sensing mechanism is
A pressure receiving portion disposed in the flow path so as to move when receiving the flow velocity greater than or equal to the predetermined value;
A second interlocking member disposed above the other end side of the lock plate and interlocking with the movement of the pressure receiving portion;
When the pressure receiving portion moves, the second interlocking member pushes down the other end side of the lock plate to disengage the lock pin on the one end side from the lock hole, thereby locking the swing arm. ,
The weight-type emergency shut-off valve according to claim 1.

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