JPH0821563A - Shutoff valve reset mechanism of gas meter - Google Patents

Abstract

PURPOSE:To secure the valve closing function of a shutoff valve for a gas meter when failure is generated, by hindering a reset shaft from undue operation when the shuftoff valve is in the opened condition. CONSTITUTION:The body 1 of a gas meter is equipped with a shutoff valve 7 which is closed when any failure has occurred. A shutoff valve returning mechanism to push the stem 8 of the shutoff valve 7 in closed condition by intruding the return shaft 12 against the resilient action of the return spring 13 and return the valve 7 manually to the open condition is fitted with a locking mechanism 32 which locks the return shaft 12 in the standby position while the valve 7 is in the open condition. wherein the arrangement includes a return shaft box 11 installed on the meter body 1, a return shaft 12 installed at the return box 11 with possibility of axial movement, and a return spring 13 which energizes the return shaft 12 to the standby position at all times. The locking mechanism 32 is disengaged by the closing motion of the valve 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve return mechanism for a gas meter for manually returning a shutoff valve that has closed a gas flow path to an open state when an abnormality occurs in the gas meter.

[0002]

2. Description of the Related Art Conventionally, there is a gas meter provided with a shut-off valve that shuts off the gas flow passage by closing the valve when an abnormality occurs, for example, when an abnormality occurs in the flow rate of the gas flowing through the gas flow passage or the flow time. An example of such a gas meter with a shutoff valve will be described with reference to the schematic view of FIG. The meter body 1 of the gas meter has a gas inlet 2 and a gas outlet 3. As is well known, the gas from the gas supply source is measured in the weighing box 5 from the gas inlet 2 through the gas flow path 4, and then from the gas outlet 3 to a terminal device such as a gas stove or an oven through a pipe. Flowing. The weighing box 5 is mainly composed of a diaphragm film (not shown), an integrating meter for displaying the usage amount by utilizing the operation of the diaphragm film, and the like. A valve seat 6 is provided on the way of the gas flow path 4 which leads from the gas inlet 2 into the measuring box 5.

The shut-off valve 7 that closes the valve seat 6 of the gas passage 4 when an abnormality occurs is composed of an electromagnetic valve and is installed in the meter body 1 with the same axis as the valve seat 6. Shut-off valve 7
A valve plate 9 capable of closing the valve seat 6 is provided at the tip of the valve shaft 8. The shutoff valve 7 is electrically connected to a controller (not shown). The controller determines whether or not there is an abnormality based on a signal from a flow rate sensor that detects the flow rate of the gas flowing through the gas flow path 4, and outputs an operation signal to the shutoff valve 7 when the abnormality occurs, and the shutoff valve 7 is activated. Operate the valve closing. Further, the shut-off valve 7 is normally in an open state (solid line in the figure), and when the shut-off valve 7 is closed by receiving an operation signal from the controller, the valve shaft 8 is projected and the valve seat 6 is closed by the valve plate 9. The gas flow path 4 is shut off (see the chain double-dashed line in FIG. 13).

Next, a conventional example of a shutoff valve returning mechanism for manually returning the shutoff valve 7 in the closed state to the open state will be described with reference to the sectional view of FIG. The shutoff valve return mechanism includes a tubular return shaft box 111 installed in the meter body 1, a return shaft 112 movably provided in the return shaft box 111, and the return shaft 112 at a standby position at all times. And a return spring 113 for urging. A return shaft cap 114 that covers the operation side end of the return shaft 112 is screwed to the return shaft box 111. When the shutoff valve 7 in the closed state is returned to the open state, the return shaft cap 114 is removed and the return shaft 112 is pushed in with a fingertip. Then, the return shaft 112 pushes the valve shaft 8 of the shutoff valve 7 (see the chain double-dashed line in FIG. 14) to return the shutoff valve 7 to the open state. Further, after the return operation, when the pushing on the return shaft 112 is released, the return shaft 112 returns to the standby position by the elasticity of the return spring 113. The shutoff valve return mechanism as described above is disclosed as a conventional example in Japanese Utility Model Laid-Open No. 3-117186 by the same applicant.

[0005]

In the conventional shutoff valve return mechanism for a gas meter, the return shaft 112 can be pushed in regardless of whether the shutoff valve 7 is open or closed. For this reason, when the shutoff valve 7 is in the open state and the return shaft 112 is intentionally fixed in an improperly pushed state, the shutoff valve 7 shuts off when an abnormality occurs in the gas flow rate or the flow rate time flowing through the gas flow path 4. A situation occurs in which the valve 7 cannot be closed,
There is a fear that the function of shutting off the gas flow path 4, that is, the valve closing function may be impaired.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to prevent an erroneous operation of the return shaft when the shutoff valve of the gas meter is in the open state, thereby causing an abnormality. An object of the present invention is to provide a shutoff valve return mechanism of a gas meter capable of ensuring the closing function of the shutoff valve at the time.

[0007]

In order to achieve the above object, the invention of claim 1 is installed in a meter body of a gas meter provided with a shut-off valve for closing a gas passage by closing a valve when an abnormality occurs. A return shaft that is provided in the return shaft box so that the return shaft is movable, and a return spring that normally urges the return shaft to a standby position. A shutoff valve resetting mechanism for a gas meter, which pushes against the elasticity of a spring to push the valve shaft of a shutoff valve in a closed state, and is capable of manually returning the shutoff valve to an open state. A shutoff valve return mechanism for a gas meter, which is provided with a lock mechanism that locks the return shaft at a standby position in the open state of the shutoff valve and releases the lock by closing the shutoff valve. According to a second aspect of the present invention, in the shutoff valve return mechanism for a gas meter according to the first aspect, the return shaft is provided so as to be movable from a standby position to a retracted position in a counter-pushing direction, and an operation side end of the return shaft. Is a shutoff valve return mechanism of the gas meter, which is provided with display means for indicating the moving states of the standby position and the retracted position.

[0008]

According to the first aspect of the present invention, when the return shaft is in the standby position with the shutoff valve open, the return shaft is locked by the lock mechanism, so that the return shaft cannot be manipulated illegally. When the shut-off valve closes when an abnormality occurs, the lock of the lock mechanism with respect to the return shaft is released, so that the shut-off valve can be restored by the return shaft.
Therefore, by pushing the return shaft against the elasticity of the return spring, the shutoff valve can be returned to the open state in conjunction with it. After the return operation, when the pushing against the return shaft is released, the return shaft is returned by the elasticity of the return spring and is locked by the lock mechanism at the standby position.
Further, according to the invention of claim 2, when the return shaft is in the standby position, the shutoff valve is in the open state, and the display means at the operation side end of the return shaft is in the open valve display. When the shut-off valve closes when an abnormality occurs and the lock mechanism for the return shaft is unlocked, the return shaft moves to the retracted position by the elasticity of the return spring, and the display means of the return shaft closes. Will be displayed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In this example, the shutoff valve returning mechanism in the conventional gas meter is changed, and therefore the mechanism will be described in detail, and the same description will be omitted for the meter body 1 and the shutoff valve 7 by giving the same reference numerals. In FIG. 1 in which the peripheral portion of the shutoff valve return mechanism of the gas meter is shown in a sectional view and in FIG. 3 in which the peripheral portion of the shutoff valve is shown in an enlarged view,
The shutoff valve return mechanism is provided with an intermediate shaft 16 between it and the shutoff valve 7 for interlocking the operation thereof. This intermediate shaft 16
Is supported by a support member 1a in the meter body 1 via an intermediate bearing 17 so as to be axially movable. The intermediate shaft 16 is arranged on the same axis as the valve shaft 8 of the shutoff valve 7, and one end (left end in the drawing) of the intermediate shaft 16 faces the tip of the valve shaft 8.

A spring seat 18 is secured to one end of the intermediate shaft 16 by a snap ring 19, and the intermediate shaft 16 is biased between the spring seat 18 and the intermediate bearing 17 toward the valve shaft 8. The spring 20 is interposed with the intermediate shaft 16 inserted therethrough. Further, the other end of the intermediate shaft 16 has an intermediate shaft adjusting screw 2
1 is screwed together. The movement stroke of the return shaft 12, which will be described later, is adjusted by screwing the adjustment screw 21 in or out. The intermediate shaft adjusting screw 21 is fixed to the intermediate shaft 16 with a set screw 22.

In addition to FIG. 1, reference is made to FIG. 2 which is an enlarged view of the shutoff valve return mechanism, and FIG. 8 which is an exploded perspective view showing a peripheral portion of a return shaft box as a housing of the mechanism. The mounting structure of the box will be described. The side plate 1 b of the meter body 1 facing the valve plate 9 of the shutoff valve 7 is provided with a mounting hole 24 located on the same axis as the valve shaft 8 and the intermediate shaft 16 of the shutoff valve 7. The cylindrical return shaft box 11 is inserted into the mounting hole 24 from the outside of the side plate 1b toward the inside. This return axis box 11
A mounting nut 25 is screwed onto the shaft portion of the insertion side. Mounting nut 25 and outer peripheral flange portion 1 of return shaft box 11
The return shaft box 11 causes the valve shaft 8 of the shutoff valve 7 by tightening the edge of the mounting hole 24 of the side plate 1b between the return shaft box 11 and 1a.
And is installed on the same axis as the intermediate shaft 16. The O-ring 2 is provided on the contact surface between the side plate 1b and the flange 11a.
6 is provided.

Next, the assembling structure of the return shaft 12 incorporated in the return shaft box 11 will be described with reference to FIG. 2 and FIG. 9 showing its peripheral portion in an exploded perspective view. A return shaft 12 for pushing the valve shaft 8 of the shutoff valve 7 in the closed state is inserted into the return shaft box 11 so as to be axially movable. At the outer end of the return shaft 12, that is, the operation side end (the right end in the drawing), a cylindrical display portion 28 having an outer diameter larger than the shaft diameter is formed. The outer peripheral surface of the display unit 28 has a valve-closed display color, for example, red due to affixing of a label or application of paint.

A return spring 13, which is a coil spring, is interposed between the outer stepped surface of the return shaft 12 and the inner stepped surface of the return shaft box 11 opposite to the return stepped shaft 12 while being externally mounted on the return shaft 12. . The return spring 13 always biases the return shaft 12 in the backward direction (rightward in the drawing). Further, an O-ring 29 that seals between the box 11 and the return shaft 12 is arranged at the inner step portion of the return shaft box 11, and the inner step surface of the return shaft box 11 and the end surface of the return spring 13 facing the inner step surface. A washer-shaped O-ring retainer 30 is interposed between them.

Next, the lock mechanism 32 provided at the tip of the return shaft 12 protruding forward from the return shaft box 11 will be described with reference to FIG. 2 and FIG. 10 showing an exploded perspective view thereof. A block-shaped base 33 is fitted to the tip of the return shaft 12 and is fixed by inserting a connecting pin 34. The base 33 has a forked mounting piece 35 at its tip. A central portion of a dogleg-shaped lock arm 36 is rotatably attached to the attachment piece 35 via a lock arm shaft 37.
The lock arm shaft 37 is located on an axis parallel to a straight line orthogonal to the axis of the return shaft 12.

The lock arm 36 extends diagonally forward (to the left in the drawing) and faces the intermediate shaft adjusting screw 21 of the intermediate shaft 16 and an operating piece 36a, and a lock piece 36b extending rearward.
And a lock claw 36c protruding toward the return shaft 12 is formed at the tip of the lock piece 36b. The lock arm 36 is wound around the lock arm shaft 37, and both ends of the lock arm 36 are constantly locked by springs 38 hooked on the lock arm 36 and the base 33.
It is biased in the engagement direction of c (counterclockwise direction in the drawing).

On the other hand, an annular lock groove 40 is formed at the tip of the return shaft box 11 so that the lock claw 36c of the lock arm 36 can be engaged with the lock shaft 36. The lock claw 36c of the lock arm 36 engages with the lock groove 40 of the return shaft box 11 at the standby position of the return shaft 12 to lock the return shaft 12 at the standby position. Further, the lock arm 36 rotates in the clockwise direction in the drawing against the urging force of the spring 38, and the lock claw 36c is disengaged from the lock groove 40 as shown by a chain double-dashed line in FIG. To release. When the lock is released, the return shaft 12 can be moved from the standby position in the pushing direction (left side in the drawing) and can also be moved to the retracted position in the counter pushing direction (right side in the drawing). A tapered guide surface 41 is formed on the outer peripheral portion of the tip end surface of the return shaft box 11. The guide surface 41 contacts the lock claw 36c of the lock arm 36 when the return shaft 12 retracts from the front of the standby position, and slides and guides the lock claw 36c.

Next, regarding the assembling structure of the return shaft retainer 43 assembled to the operation side end portion of the return shaft 12, in addition to FIG.
FIG. 11 is an exploded perspective view in which the peripheral portion is partially broken.
Will be described with reference to. A return shaft retainer 43 having a cylindrical shape with a bottom is externally fitted to the operation side end (the right end in the drawing) of the return shaft 12 so as to be axially movable. The tip end portion (the left end portion in the drawing) of the return shaft retainer 43 is inserted into the return shaft box 11 so as to be axially movable. The return shaft retainer 43 is mainly composed of a cylindrical plastic shaft cylinder body 44, a cup-shaped transparent plastic display window 45 connected to the end surface of the shaft cylinder body 44, and its display window 45. A plastic valve-opening display cylinder 46 which is not cup-shaped and is inserted into the display portion 28 of the return shaft 12 which is connected to the center portion of the
Consists of The valve-opening display cylinder 46 has a valve-opening display color, for example, green which is easy to discriminate from the valve-closing display color red. The shaft cylinder 44 has a color that makes the display colors red and green easy to see, and is inconspicuous, for example, gray or black.

A display spring 47, which is a coil spring, is interposed between the opposed surfaces of the display cylinder 46 and the display portion 28. The display spring 47 always biases the return shaft retainer 43 in the backward direction (rightward in the drawing). The valve open display cylinder 46 is
When the return shaft 12 is exposed to the rear of the display portion 28 at the standby position and the valve opening is displayed through the display window 45, the return shaft 12 is fitted into the display portion 28 when retracted from the standby position. Be hidden.

A long groove 48 is provided on the side surface of the shaft cylinder 44 along the axial direction thereof. A pin-shaped return shaft pressing stopper 49 screwed onto the side wall of the return shaft box 11 is fitted into the long groove 48. This allows
The return shaft retainer 43 can be moved with a predetermined amount of movement in a state where it is not rotated. Also, the shaft cylinder 4
A return shaft pressing spring 50 formed of a coil spring is interposed between the step surface on the outer periphery of the tip end portion of No. 4 and the inner step surface of the return shaft box 11 facing the step surface. The return shaft retainer spring 50 always biases the return shaft retainer 43 in the backward direction (rightward in the drawing).

Next, the mounting structure of the return shaft cap 14 attached to the operation side end of the return shaft box 11 will be described with reference to FIG. 2 and FIG. 12 showing its peripheral portion in an exploded perspective view. On the operation side of the return shaft box 11, a return shaft cap 14 having a bottomed cylindrical shape that covers the operation side end of the return shaft retainer 43 is screwed. The return shaft cap 14 is made of transparent plastic. Through the cap 14, the display that appears on the display window 45 of the return shaft retainer 43, that is, the valve open display color of the valve open display cylinder 46 is green or the return. The valve closed display color red on the display unit 28 of the shaft 12 can be recognized.

The return shaft cap 14 is connected to the return shaft box 11 by a flexible plastic captive ring 52. The drop-out prevention ring 52 has ring portions 52b and 52c formed at both ends of a connecting piece 52a. One ring portion 52b is fitted to the return shaft cap 14 and the other ring portion 52c is connected to the return shaft box 11.
And is fastened to the flange portion 11a by the return shaft cap 14.

Next, with respect to the operation of the shutoff valve return mechanism of the gas meter, in addition to FIG. 1, FIG.
~ Will be described with reference to FIG. In the shutoff valve return mechanism, when the shutoff valve 7 is in the open state, as shown in FIG. 1, the intermediate shaft 16 is positioned on the shutoff valve side by the bias of the spring 20, and the lock mechanism 32 is locked. Arm 3
The lock claw 36c of 6 is the lock groove 4 of the return shaft box 11.
0 and the return shaft 12 is locked in the standby position. At this time, the display unit 28 of the return shaft 12 displays the return shaft retainer 4
The valve opening display cylinder 46 is hidden in the shaft cylinder 44 of No. 3, and is displayed in the display window 45 that is visible through the return shaft cap 14.
The green color of is displayed.

In this normal state, that is, when the return shaft 12 is in the standby position when the shutoff valve 7 is open, the return shaft 12 cannot be manipulated as follows. That is, even if the return shaft cap 14 is detached as shown in FIG. 4 and the return shaft presser 43 is pushed in with a fingertip, the return shaft presser 43 hits the return shaft 12 and the lock arm 36 of the lock mechanism 32. Although the rattling of the engagement between the lock claw 36c and the lock groove 40 of the return shaft box 11 is pushed in, the lock mechanism 32 is pushed when pushed further.
This is not possible because the return shaft 12 is locked by the engagement of the lock claw 36c and the lock groove 40. Therefore, the return shaft 12 cannot be illegally operated, and dangerous handling that impairs the valve closing function of the shutoff valve 7 can be avoided, thus ensuring the valve closing function of the shutoff valve 7 when an abnormality occurs. can do.

In the normal state shown in FIG. 1, when an abnormality occurs, the shutoff valve 7 is closed by the controller to shut off the gas passage 4. This shutoff valve 7
The valve shaft 8 moves the intermediate shaft 16 to the right in the drawing against the bias of the intermediate shaft spring 20 in accordance with the valve closing operation. Then
As shown in FIG. 5, the intermediate shaft adjusting screw 21 pushes the operating piece 36a of the lock arm 36, whereby the lock arm 36 rotates in the clockwise direction in the drawing against the bias of the spring 38 (see FIG. 2). Then, the lock claw 36c is disengaged from the lock groove 40 of the return shaft box 11, and the lock of the lock mechanism 32 with respect to the return shaft 12 is released.

The return shaft 12, which has been unlocked by the lock mechanism 32, is retracted by the return spring 13 in the counter-pushing direction to the retracted position against the bias of the display spring 47. As a result, the display unit 28 of the return shaft 12 conceals the valve-opening display cylinder 46 of the return shaft retainer 43 and is located in the display window 45, so that the display unit 28 can be seen in the display window 45 through the return shaft cap 14. The display color of red is displayed. As the return shaft 12 moves backward,
The lock arm 36 is returned to the counterclockwise direction in the drawing by the biasing force of the lock arm spring 38 (see FIG. 2), and the lock claw 36c abuts on the outer surface of the return shaft box 11.

Next, in order to return the shut-off valve 7 that has been closed to the open state, the return shaft cap 14 is removed as shown in FIG. 7, and the return shaft retainer 43 is pushed in with a fingertip. The return shaft 12 is pushed together with the return shaft retainer 43 against the bias of the return spring 13 and the return shaft retainer spring 50. Along with this, the operating piece 36a of the lock arm 36 hits the intermediate shaft adjusting screw 21, and the lock arm 3
6 rotates in the clockwise direction in the figure against the bias of the spring 38 (see FIG. 2), and the end face of the base 33 comes into contact with the intermediate shaft adjusting screw 21. 16
Is axially moved to the left in the figure, the valve shaft 8 of the shutoff valve 7 is pushed against the urging thereof, and as a result, the shutoff valve 7 returns to the open state shown in FIG.

After that, when the pushing of the return shaft retainer 43 is released, the return shaft retainer 43 retracts to the original position by the bias of the spring 50, the return shaft 12 retracts with the bias of the return spring 13, and the lock arm. 36 is returned and rotated by the urging of a spring 38 (see FIG. 2). Then, the lock claw 36c of the lock arm 36 is locked by the return shaft 12
Of the return shaft box 11 and slides along the guide surface 41 of the return shaft box 11 until the return shaft 12 returns to the standby position by the bias of the spring 38 to the lock groove 40. Engage and lock the return shaft 12 in the standby position shown in FIG.

Further, the return shaft 1 is returned to the original position and the return shaft 12 is returned to the standby position.
The second display unit 28 is hidden in the shaft cylinder 44 of the return shaft retainer 43, and the display window 45 displays the green color of the valve open display cylinder 46. Then, return axis box 11
The return shaft cap 14 is attached to the.

According to the shut-off valve return mechanism, the open / closed state of the shut-off valve 7 can be visually recognized by locating the display portion 28 of the return shaft 12 in the display window 45 of the return shaft retainer 43 or not. Check for malfunction of 7 and shut off valve 7
The inconvenience in use, such as trying to operate the return shaft 12 despite the valve being opened, is eliminated.

Further, in this embodiment, the return shaft retainer 43 is provided with the valve open display cylinder 46 which is hidden by the display unit 28 of the return shaft 12, so that the display color is different from that of the display unit 28 when the valve is opened. Therefore, the display becomes clearer.
Since the opening / closing of the shutoff valve 7 can be recognized from the moving position of the display unit 28 of the return shaft 12, the valve open display cylinder 46 can be eliminated or the return shaft retainer 43 can be eliminated. The display unit 28 corresponds to the display means in the present invention.

Further, since the return shaft cap 14 made of transparent plastic is provided to cover the return shaft presser 43, the return shaft presser 43 is protected and the display window 45 of the return shaft presser 43 can be provided without removing the cap 14. Can be visually confirmed, which is convenient. Further, since the intermediate shaft 16 is provided between the valve shaft 8 and the return shaft 12 of the shutoff valve 7, the valve seat 6
It is possible to reduce the obstruction of the gas flow due to the lock mechanism 32 being positioned inside. In addition, the intermediate shaft adjusting screw 2
By providing 1, the total length of the intermediate shaft 16 is adjusted,
The movement stroke of the return shaft 12 can be made appropriate.

[0032]

According to the first aspect of the present invention, when the return shaft is in the standby position with the shutoff valve open, the return shaft is locked by the lock mechanism. Therefore, it is possible to secure the valve closing function of the shutoff valve when an abnormality occurs. According to the invention of claim 2, the shutoff valve return mechanism of the gas meter according to claim 1 can be used to open / close the shutoff valve, which is lower than in the case where a dedicated shutoff valve open / close display mechanism is provided. You get the cost stuff.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a peripheral portion of a shutoff valve return mechanism of a gas meter.

FIG. 2 is an enlarged view showing a shutoff valve return mechanism.

FIG. 3 is an enlarged view showing a portion around a shutoff valve.

FIG. 4 is an explanatory diagram showing a lock function of a lock mechanism.

FIG. 5 is an explanatory diagram showing an unlocked state of the lock mechanism.

FIG. 6 is an explanatory diagram showing a shutoff valve closed state of the shutoff valve return mechanism.

FIG. 7 is an explanatory diagram showing a shutoff valve returning operation of the shutoff valve returning mechanism.

FIG. 8 is an exploded perspective view of a peripheral portion of a return shaft box.

FIG. 9 is an exploded perspective view of a portion around a return shaft.

FIG. 10 is an exploded perspective view of a lock mechanism.

FIG. 11 is an exploded perspective view in which a portion around the return shaft retainer is broken away.

FIG. 12 is an exploded perspective view of a peripheral portion of a return shaft cap.

FIG. 13 is a schematic view showing a conventional gas meter.

FIG. 14 is a cross-sectional view showing a conventional shutoff valve return mechanism.

[Explanation of symbols]

 1 Meter Main Body 4 Gas Flow Path 7 Shutoff Valve 8 Valve Axis 11 Return Axis Box 12 Return Axis 13 Return Spring 28 Display (Display Means) 32 Lock Mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Morii 2795 Motoe, Shinminato City, Toyama Prefecture Toyo Gas Meter Co., Ltd.

Claims (2)

[Claims] 1. A tubular return shaft box installed in a meter body of a gas meter, which is equipped with a shut-off valve that shuts off a gas flow path when an abnormality occurs, and a return shaft box that is axially movable. Valve shaft of a shut-off valve in a closed state by pushing the return shaft against the elasticity of the return spring. Is a shut-off valve return mechanism of a gas meter, in which the shut-off valve can be manually returned to an open state by locking the return shaft at a standby position in the open state of the shut-off valve, and A shutoff valve return mechanism for a gas meter, which is provided with a lock mechanism that unlocks the lock by closing the shutoff valve. 2. The shutoff valve return mechanism for a gas meter according to claim 1, wherein the return shaft is provided so as to be movable from a standby position to a retracted position in a counter-pushing direction, and a standby position is provided at an operation side end of the return shaft. And a shutoff valve return mechanism of the gas meter, which is provided with a display means for indicating the moving state between the retracted position and the retracted position.