JPS6330719Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid supply stop device that can supply a predetermined amount of oil to a tank truck or the like without overflowing.

Generally, a liquid supply and shipping device for shipping a predetermined amount of oil to a tank truck or the like has a configuration shown in FIG.
In the liquid supply and shipping device 1, the oil liquid 3 is fed into the tank 2 through the pump 5 of the piping 4, the air separator 6, the flow meter 7, and the metering valve 8 in order, and further the rising piping section 4a,
The liquid is supplied into the hatch 13 of the tank truck 12 via the rotatable loading arm 9, the liquid supply stop device 10, and the drop pipe 11. At this time, each time the tank truck 12 enters, the loading arm 9 is operated to connect the drop pipe 11 to the hatch 13.
The oil is then transferred and inserted inside to supply the oil.
Under normal conditions, the metering valve 8 closes when a predetermined amount of liquid has been supplied to end the liquid supply, but in an emergency such as when the metering valve 8 breaks down, the oil level rises further and the liquid level detection pipe 14 reaches the upper limit. Liquid supply stop device 1 when oil level is detected
0 is in a closed state to prevent oil from overflowing from the hatch 13.

As mentioned above, an example of a liquid supply stop device that detects the liquid level and closes the valve is ``Liquid Supply Stop Device'' published in Japanese Utility Model Application No. 57-115423. With this device, the valve body can be opened and closed manually, and when liquid is supplied, the valve body that is locked in the open state is released by detecting the liquid level upper limit position, and the spring biasing force is released. Based on this, the valve body is closed.

By the way, in the above device, when the upper limit position of the liquid level is detected and the valve is closed, the valve body closes rapidly due to the biasing force of the spring, but since the liquid supply continues, the so-called water hammer phenomenon does not occur. There was a risk of damage to the piping system.

This invention provides a piston body that moves up and down integrally with the main valve body at the lower part of the main valve body, and forms a damper chamber between the piston body and the cylinder part of the valve body that accommodates the piston body, and opens the main valve body. In case of an emergency, the main valve element is unlocked by the liquid level upper limit detection signal, and the piston body moves downward together with the main valve element to throttle the liquid in the damper chamber and open the passage. A liquid supply stop device that allows fluid to be discharged through the damper chamber and has a damper effect to gently close the main valve body using the liquid pressure in the damper chamber, thereby preventing the occurrence of water hammer phenomenon such as in the case of emergency valve closing. The purpose is to provide

The configuration for this purpose includes a valve body that is provided in the middle of the liquid supply pipe and has a valve seat and a bottomed cylindrical cylinder part;
a valve body shaft provided on the valve body so as to be movable up and down; and a main valve body that moves up and down integrally with the valve body shaft and seats on and off the valve seat, constituting a main valve for opening and closing the liquid flow path. , a piston body fitted into the cylinder part in a vertically movable state substantially integrally with the main valve body at the lower part of the main valve body, and forming a damper chamber between the piston body and the bottom of the cylinder part; a liquid inflow passage provided in the cylinder portion and communicating the damper chamber with the liquid passage on the upstream side when the piston body is in the upward movement position; a liquid discharge throttle channel for discharging the liquid according to its degree of restriction and imparting a damper effect to the closing operation of the main valve; and a handle rotatably provided on the valve body for opening the valve body. and,
A locking mechanism portion in which a needle expands a locking body provided on the valve body shaft outward to lock the valve body shaft when the main valve is in an open state, and a liquid supply surface reaches a predetermined position. A first lock release mechanism displaces the needle to release the lock and close the main valve; A second valve that releases the lock and closes the main valve.
It consists of a lock release mechanism section.

Next, one example thereof will be explained.

FIG. 2 is a front view of one embodiment of the liquid supply stop device according to the present invention, and FIGS. 3A and 3B are A--A in FIG.
FIG. 2 is a cross-sectional view taken along line A and line B-B.

In the figure, the liquid supply stop device 21 has a valve body 22 and an upper casing 20 that closes the valve body 22. The valve body 22 has an inlet 22a connected to the loading arm 9, an outlet 22b connected to the drop pipe 11, and a valve seat member 23 below the chamber 22c. The valve seat member 23 has a ring-shaped valve seat 23a and a central bottomed cylindrical cylinder part 23c (the inside becomes a damper chamber 23d) with a rib part 23b interposed therebetween.
The cylinder part 23c has an approximate dimension l ₁ from the bottom around the cylinder part 23c.
A plurality of communication holes 23 are provided at the height position (shown in Fig. 9).
e (communicates the inlet 22a and the damper chamber 23d)
and a throttle communication hole 23f at the bottom (which communicates the damper chamber 23d and the outlet 22b).

A main valve body 24 has a valve body portion 24a, and constitutes a main valve 25 together with the valve seat 23a. Main valve body 24
has a cylindrical piston part 24b (center hole 2
4c) is provided protrudingly, and a valve body shaft 27 (described later)
The valve body portion 24a is integrally urged downward by the coil spring 26, and the valve body portion 24a is seated on the valve seat 23a.
The piston portion 24b is always fitted relatively tightly into the cylinder portion 23c so as to be vertically movable, and the damper chamber 23d is formed on the downstream side of the main valve 25 between the piston portion 24b and the piston portion 23c.

27 is a valve body shaft, which includes a center hole 27a and an upper hole 27.
b. It has a lower stepped portion 27c, which is fitted into the cylinder portion 23c, the center hole 24c of the main valve body 24, and the hole 20a of the upper casing 20 in order from below, and the main valve body 24 is fitted between the stepped portion 27c and the stop ring 28.
Since it is fixed, it can move up and down integrally with the main valve body 24.

29 is a reset shaft, which is inserted into the center hole 27 of the valve body shaft 27.
The rod is fitted so as to be movable up and down relative to A, and as shown in FIG. 3A, it moves downward due to its own weight, and the lower end of the rod comes into contact with a pressing piece 42, which will be described later, and stops.

30 is a rotatable handle shaft, and a push lever 3
1 (shown in Figures 3B and 4), handle 32,
A pressing pin 33 constituting a second lock release mechanism section 53, which will be described later, and a first clutch section 34 (shown with diagonal lines in FIG. 8) consisting of a pair of fan-shaped convex sections are fixed. The handle 32 is attached to a torsion spring 35 (Fig. 3B).
) is biased downward in FIG. 3A.

Reference numeral 41 denotes a forked link, which is separately rotatably fitted to the handle shaft 30, and as shown in FIGS. It has a pressing piece 42 and a second clutch portion 43 (shown with satin finish in FIG. 8) consisting of a pair of fan-shaped convex portions. The link 41 has a notched groove 41a
is connected to the lower part of the valve body shaft 27 via a pin 44, and in conjunction with the valve body shaft 27, is located at the limit of counterclockwise rotation when the valve is closed as shown in FIGS. 3A, 6, and 7.

Reference numeral 45 denotes a locking mechanism, which includes a needle 47 (having a tapered part 47a) fixed to the diaphragm membrane 46 of the upper casing 20, a ball 48 housed in the upper hole 27b of the valve shaft 27, and a tapered part at the upper part of the center hole 20a. It consists of a ring member 49.

Reference numeral 50 denotes a first lock release mechanism section, which is composed of the diaphragm membrane 46 (biased downward by a coil spring 51), and an upper chamber 20b and a lower chamber 20c defined by the diaphragm membrane 46. 2
0b is the liquid level detection pipe 52 as shown in Figures 2 and 6.
The lower chamber 20c is opened to the atmosphere.

Reference numeral 53 denotes a second lock release mechanism section, which consists of the above-mentioned pressing pin 33 fixed in the direction orthogonal to the axis of the handle shaft 30 as shown in FIG. When the valve is closed in FIGS. 3A, 6, and 7, the pressing piece 42 rotates counterclockwise due to its own weight, comes into contact with the pressing pin 33, and stops.

Reference numeral 61 designates a flow divider valve, which is provided in the middle of the flow divider path 62 that divides the flow between the chamber 22c and the outlet 22b, as shown in FIGS. 4A to D and FIG. 6, and is fitted and fixed into the hole 22d of the valve body 22. It consists of a valve seat 63a of the main body 63 and a valve body portion 64a of the valve body 64. Diversion valve body 63
(The valve seat 63a) is further connected to the center hole 63b and the valve body 22.
It has a cylindrical guard part 63c projecting downward,
The guard portion 63c has a hole 63d and one axial notch groove 6.
3e, one elongated hole 63f and a pair of engagement grooves 63g on both sides thereof. The valve body 64 (valve body part 64a) further has a shaft part 64b, and is urged downward by a spring 65 so that the valve body part 64a seats on the valve seat 63a to close the flow dividing valve 61, and the shaft part 64b is the center hole 63b
is inserted into the hole 63d of the guard portion 63c and protrudes by a predetermined amount. Note that the pressing lever 31 has a notch groove 63e.
The shaft portion 6 of the valve body 64 enters the hole 63d through the hole 63d.
It faces the lower end of 4b.

Reference numeral 66 in FIGS. 5A and 5B is a special tool for opening the valve (for pushing up the valve stem of the diversion valve), which includes a grip part 66a and a shaft part 66b.
(having a pair of engagement pin parts 66c) and a tip pressing part 66d.

67 is a ventilator as a negative pressure generating part, and as shown in FIG. 4A and FIG.
A branch pipe 52a of the liquid level detection pipe 52 is opened.

Next, the operation of the liquid supply stop device 21 will be explained. 3A and 6, after the metering valve 8 closes and the oil in the loading arm 9 flows out as described later, the main valve 2
5 is in a closed state. Note that the damper chamber 23d is filled with air. In the figure, handle 3
2 to open the first clutch portion 34 as shown in FIG.
is engaged with the second clutch portion 43 of the link 41, and in this state, the handle 32 is rotated clockwise. Then, since the link 41 integrally rotates in the same direction due to the engagement of the clutch, the pin 4
4, the valve body shaft 27 and the main valve body 24 are moved upward in conjunction with each other, the valve body portion 24a is separated from the valve seat 23a, and the main valve 25 is opened. As shown in Fig. 9, the main valve body 24 moves upward by approximately dimension l ₂ (however, l ₂ >l ₁ ), and the inlet 2
2a is passed through the main valve 25 to the drop pipe 1.
1, and liquid supply begins.

Here, the piston portion 24b is displaced within the cylinder portion 23c to a position above the communication hole 23e due to the relationship of the above-described dimension l ₂ >l ₁ . Therefore, the oil in the inlet 22a also flows into the damper chamber 23d through the communication hole 23e, the air in the damper chamber 23d is pushed out from the throttle communication hole 23f toward the outlet 22b, and the damper chamber 23d is filled with oil. It is replaced by liquid.

At the same time that the valve body shaft 27 reaches its upper limit of movement, the ninth
In the drawing, the tapered portion 47a of the needle 47 presses the ball 48 against the ring member 49, so that the valve shaft 27 is locked in the upward movement position in the drawing. When the valve body shaft 27 starts to move upward, the pressing piece 42 also rotates clockwise around the handle shaft 30 while maintaining the relationship shown in FIG. 7 relative to the link 41 to reach the position shown in FIG. 9. . Therefore, the reset shaft 29 is pushed by the pressing piece 42 and moves upward, as shown in FIG.
The upper end of the reset shaft 29 substantially contacts the lower end of the needle 47.

On the other hand, when the handle 32 is rotated, the pressing lever 31 presses and displaces the valve element 64 upward via the shaft portion 64b of the valve element 64 of the flow dividing valve 61, opening the flow dividing valve 61, as shown in FIG. Handle shaft 30
Since the pressing lever 31 is held in the downward rotational position shown in FIGS. 9 to 11 by the biasing force of the torsion spring 35, the diversion valve 61 is maintained in the open state. Therefore, a part of the oil in the chamber 22c begins to steadily flow to the outlet 22b via the branch channel 62, and
7, negative pressure is generated in the branch pipe 52a.
However, at the beginning of the liquid supply, the liquid level in the hatch 13 of the tank truck is low and the liquid level detection pipe 52 is not blocked by the liquid level, so the branch pipe 52a
The air sucked in due to the generation of negative pressure is replenished from the opening of the liquid level detection pipe 52, so that the upper chamber 20b does not become under negative pressure.

However, as the liquid supply progresses, the liquid level rises and reaches the upper limit position (in an emergency), and when the opening of the liquid level detection pipe 52 is blocked, the air supply from the pipe 52 side is cut off, and the air in the upper chamber 20b is sucked in, resulting in low pressure. Since the lower chamber 20c is always at atmospheric pressure, the diaphragm film 46 moves upward against the spring 51. That is, the first lock release mechanism 50 is activated, the needle 47 is moved upward, and the lock of the lock mechanism 45 is released. Thus, the valve shaft 27 and the main valve 24 are moved downward by the spring 26, and the valve body 24a
The piston 24b returns to its seat on the valve seat 23a, the main valve 25 is closed, and the supply of liquid is stopped. At this time, the piston 24b moves downward within the cylinder 23c,
The oil in d is pushed out downstream from the throttle communication hole 23f, but is pushed out only gradually due to the throttle effect of the throttle communication hole 23f, providing a damper effect to the main valve element 24. Therefore, the main valve element 24 is moved downward slowly due to the damper effect and seats as described above, so that water hammer is not generated when the valve is closed, and there is no adverse effect on the metering valve 8, flowmeter 7, etc. that would be caused by water hammer. The downward movement speed of the main valve element 24 can be easily adjusted by appropriately selecting the inner diameter of the throttle portion of the throttle communication hole 23f. If the throttle communication hole 23f is a variable throttle instead of a fixed throttle, the adjustment becomes even easier.

When the valve body shaft 27 moves downward, the link 41 and the pressing piece 42 also rotate counterclockwise in conjunction with each other and return to the position shown in FIG. The valve body 64 integrally rotates back to the position shown in FIG. 6, and the valve body 64 of the flow dividing valve 61 also moves downward to be in a closed state. Incidentally, while the valve body shaft 27 is moving downward, the reset shaft 29 also moves downward away from the lower end of the needle 47.

Note that after the valve is closed in the above-mentioned emergency, the loading arm 9 is filled with oil and hydraulic pressure is acting on the upper surface of the main valve body 24, so the handle 32 cannot be operated after this. However, it cannot be rotated by manual force, so there is no risk of oil leakage due to erroneous operation of the handle, and there is no risk of the oil being stolen due to handle operation. In addition, by knowing that the handle cannot be operated, it is possible to know that the emergency valve has been closed, that is, that the metering valve or the like has failed, and there is the advantage that countermeasures can be taken immediately. As mentioned above, the reason why the main valve 25 does not open by operating the handle 32 after closing in an emergency is that hydraulic pressure is acting on the upstream side of the main valve body 24. If only the pilot valve is opened first as in the conventional case, the main valve can also be easily opened even after the valve is closed in an emergency.

The liquid supply stop device 21 configured as described above is configured so that when the liquid level is displaced to a predetermined position, the opening of the liquid level detection pipe 52 is closed and the upper chamber 20 of the diaphragm membrane 46 is closed.
b. Since the first lock release mechanism section 50 is configured to operate due to the differential pressure generated between the lower chamber 20c,
It operates reliably even with a low pressure liquid level detection signal.

Next, after the emergency valve is closed due to a failure of the metering valve, etc., when the cause is investigated and repairs are completed at the liquid supply station, liquid can be supplied quickly by operating the handle 32. It is necessary to return to the above state, but this can be done by opening the flow dividing valve 61 and draining the oil in the loading arm 9. (At this time, it is impossible to operate the handle 32 for the reason mentioned above.) If the driver of the lorry vehicle were to be able to push up the valve body 64 without permission using a screwdriver, etc., the diverter valve 61 could be damaged. There is a risk that maintenance problems may occur, such as liquid supply being restarted before the cause is investigated. Therefore, in the present application, the diverter valve 61 is provided with a guard portion 63c, and the guard portion 63c is provided in the general-purpose tool such as the screwdriver.
c is in the way, making it impossible to open the valve, and the worker at the filling station must properly investigate the cause and repair it before opening the valve using the special tool 66 shown in Figures 5A and 5B. , which will be explained below.

After the above cause investigation and repair are completed, the worker at the gas station inserts the tip of the special tool 66 through the long hole 63f of the guard portion 63c and into the hole 63d, as shown by the two-dot chain line in FIG. 4A. The pair of engagement pin portions 66c are respectively engaged with and applied to the engagement grooves 63g, and the tip pressing portion 66d is opposed to the lower side of the shaft portion 64b of the valve body 64. And the grip part 66a of the tool 66
When the valve body 64 is rotated downward using the engaging portion as a fulcrum, the pressing portion 66d moves upward due to the lever principle and abuts against the shaft portion 64b with a large force, causing the valve body 64 to be inserted into the spring 65. Push up. Therefore, the diversion valve 61 opens, and the oil in the loading arm 9 flows into the diversion path 62.
through the handle 32 to the outlet 22b side.
The operation returns to the initial state where the valve can be opened.

Here, although the liquid supply and shipping device 1 shown in FIG. There are more cases (in normal times) in which the metering valve 8 is automatically closed and shipping is stopped when a preset amount of liquid is supplied than in cases in which the liquid is supplied (in an emergency).

When the liquid supply is automatically stopped by the metering valve 8, the 9th
In the figure, since the first lock release mechanism 45 does not operate at all, the main valve 25 remains open. Therefore, the oil remaining in the loading arm 9 in FIG.
The liquid flows through the valve portion of the valve and flows out into the drop pipe 11.
At the same time, the oil in the damper chamber 23d also flows out into the drop pipe 11.

The operator waits for a while until the residual oil is completely drained, and then turns the handle 3 in Figure 11.
2 in the counterclockwise direction indicated by the dotted arrow. Then, as is clear from the configuration in the same figure, the first
Even if the clutch portions 34 of the two rotate in the same direction, the clutches are not engaged, and the link 41 remains locked in the rotational position shown in FIGS. only rotates in the same direction and reaches the same position as in FIG. Therefore,
As shown in FIG. 12, the pressing pin 33 presses the right end of the pressing piece 42 while rotating in the same direction to rotate it clockwise (the configuration of the clutch portion at this time is shown in Fig. 13).
(shown in the figure), the pressing piece 42 presses and displaces the reset shaft 29 upward, causing the needle 47 to move upward.

That is, the second lock release mechanism section 53 operates,
Finally, the needle 47 moves up a predetermined distance to release the pressure on the ball 48.

Therefore, in FIG. 9, the valve body shaft 27 and the valve body 24 are released from the lock by the locking mechanism 45, and begin to move downward from the position shown in the figure by the spring 26, as in the above case. Main valve 24 is closed. At the same time, the link 41 also rotates counterclockwise and returns to the sixth position.
At the same time as returning to the position shown in the figure, the pressing piece 42 also returns to the position shown in the figure.

According to the above operation, the liquid supply stop device 21 is manually closed after the oil remaining in the loading arm 9 has completely flowed out during metered liquid supply when the metering valve 8 is closed. . Therefore, in the piping section between the metering valve 8 and the liquid supply stop device 21 in FIG. Therefore, even if the outside air temperature rises and the oil expands in this state, the amount of oil is small and the loading arm 9 etc. will not be damaged, and the loading arm 9 will not be filled with oil. Because it is lightweight and has no holes, it is easy to rotate the hatch to move it to the next hatch, making work easier.

FIG. 14 shows another embodiment of the liquid supply stop device of the present invention, in which the same parts as those in FIG. In the same figure, the liquid supply stop device 71 is a second one consisting of the reset shaft 29 of the liquid supply stop device 21, the pressing pin 33, and the pressing piece 42.
In place of the lock release mechanism 53, a second knob type release mechanism 7 is provided in the upper casing 20.
2.

The second lock release mechanism section 72 includes a knob 73 (having a knob part 73a and a shaft part 73b) supported movably in the axial direction on the upper part of the upper casing 20.
and the needle 4 fixed to the diaphragm membrane 46.
an extension part 74 integral with 7' and provided at its upper end;
It consists of a shaft portion 73b of the knob 73 and an engagement pin 75 that connects the extension portion 74.

Therefore, when the main valve 25 is open and the main valve body 24 is locked by the lock mechanism 45,
When the fixed amount of liquid has been supplied and the oil in the loading arm 9 has also flowed out, pulling the knob 73 upward moves the needle 47' upward and releases the lock of the locking mechanism 45. As in the case above, the main valve body 24 moves downward to close the valve.

In the case of the liquid supply stop device 21 shown in FIG. 3A, if the handle 32 is accidentally touched and rotated back while the oil is being supplied or when the oil has not completely drained from the loading arm 9 after the completion of quantitative liquid supply, The operation of the second lock release mechanism 53 causes the main valve 25 to close. Then, since hydraulic pressure is acting on the main valve body 24, it is impossible to open the valve again by operating the handle 32, and the operation of opening the diverter valve 61 must be performed, resulting in an unexpectedly troublesome task. may require.

However, according to this liquid supply stop device 71, since it is necessary to pull the knob 73, even if the handle 32 is accidentally touched, the lock will not be released, and there is an advantage that the above-mentioned trouble is not required.

As described above, according to the liquid supply stop device of the present invention, a piston body that moves up and down integrally with the main valve body is provided at the lower part of the main valve body, and a piston body is provided between the piston body and the cylinder part of the valve body that accommodates the piston body. A damper chamber is formed, and when the main valve element is opened, supply liquid is introduced into the damper chamber. In an emergency, the main valve element is unlocked by a liquid level upper limit detection signal, and the piston body is moved together with the main valve element. By moving downward, the liquid in the damper chamber is discharged through the throttle passage, and the liquid pressure in the damper chamber acts as a damper to close the main valve body, so the piping can be closed without causing the water hammer phenomenon. It can prevent damage to the system.

Furthermore, if the present invention is configured as in the above embodiment, at least in an emergency, after the main valve is closed, the hydraulic pressure will act on the main valve, making it impossible to operate the handle and making it impossible to open the main valve. Therefore, it is possible to prevent oil leakage or theft of oil due to incorrect operation of the handle, and conversely, since the handle cannot be operated, it is possible to immediately know of the above emergency situation. It has the advantage of being able to know what is required by inspecting metering valves, etc.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a general liquid supply and shipping device.
FIG. 2 is a front view of one embodiment of the liquid supply stop device according to the present invention, and FIGS. 3A and 3B are cross-sectional views of the device taken along lines A-A and B-B in FIG. 2, respectively. , FIGS. 4A to 4D are respectively a longitudinal sectional front view and a side view of the diverter valve portion of the above device, a sectional view taken along line C-C in FIG. 4A, and a sectional view taken along line DD in FIG. 5A and 5B are respectively a front view and a side view of the above-mentioned branch valve opening tool, and FIGS. 6 and 9 are schematic configuration diagrams showing the operation of the above-mentioned device, and FIGS. 7 and 1
0 and 12 are partially cut away side views showing the operation of the second lock release mechanism of the above device, and FIG.
11 and 13 are partially cutaway side views showing the operation of the handle shaft and the clutch portion of the link, respectively, of the above device, and FIG. 14 is a longitudinal sectional front view of another embodiment of the above device. . 1...Liquid supply shipping device, 8...Dosing valve, 9...Loading arm, 10, 21, 71...Liquid supply stop device, 11...Drop pipe, 13...Hatch, 14, 52...Liquid level Detection pipe, 22... Valve body, 23, 23'... Valve seat member, 23c... Cylinder section, 23d... Damper chamber, 23e... Communication hole, 23f... Throttle communication hole, 24... Main valve body ,2
4b...Piston part, 25...Main valve, 27...Valve body shaft, 29...Reset shaft, 30...Handle shaft, 31...Press lever, 32...Handle, 4
1... Link, 45... Lock mechanism section, 50...
First lock release mechanism section, 53, 72... Second lock release mechanism section, 61... Diversion valve, 62... Diversion channel, 66... Special tool, 67... Ventilation.

Claims (1)

[Scope of utility model registration request] A valve body provided in the middle of the liquid supply pipe and having a valve seat and a bottomed cylindrical cylinder portion, a valve body shaft provided on the valve body so as to be movable up and down, and a valve body that is movable up and down integrally with the valve body shaft. a main valve body that is seated on and off the valve seat and constitutes a main valve for opening and closing the liquid flow path; and a cylinder portion that is movable up and down substantially integrally with the main valve body at the bottom of the main valve body. a piston body that is fitted into the cylinder part and forms a damper chamber between it and the bottom of the cylinder part; a liquid inlet flow path communicating with the main valve, and a liquid discharge that discharges the liquid stored in the damper chamber according to the degree of restriction when the main valve is closed, and imparts a damper effect to the closing operation of the main valve. a throttle flow path for the main valve, a handle rotatably provided on the valve body to open the valve body, and a needle that releases a locking body provided on the valve body shaft when the main valve is in the open state. a locking mechanism that expands in the opposite direction to lock the valve shaft; and a locking mechanism that displaces the needle to release the lock and close the main valve when the liquid supply surface reaches a predetermined position. 1, a lock release mechanism section;
A liquid supply stop device comprising a second lock release mechanism which is actuated by an operator at the end of quantitative liquid supply to displace the needle to release the lock and close the main valve.