JPS6348556Y2 - - 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 oil has been refilled to end the oil supply, but in an emergency such as when the metering valve 8 breaks down, the oil level rises further and the liquid level detection mechanism 1
4 detects the upper limit oil level, the liquid supply stop device 10
The valve is closed to prevent oil from overflowing from the hatch 13.

Here, the present applicant has previously proposed the above-mentioned liquid supply stop device 10 by Utility Application No. 144845/1983 entitled "Liquid supply stop device".
We proposed a system with a pilot valve in addition to the main valve that allows oil to pass through and shut off. Although a large force is required to drive the main valve, only a small force is required to drive the pilot valve.

According to this, when starting liquid supply, the pilot valve is opened by operating the handle with a small manual force, and the main valve is opened by the pilot pressure, and when the metering valve 8 is closed under normal conditions, the main valve passes through. When the oil pressure disappears, the valve automatically closes and fluid supply stops, and when the upper limit position of the liquid level is detected in an emergency, the pilot valve is first unlocked by a small pneumatic signal accompanying the detection. The main valve is closed by the pilot pressure, and liquid supply is stopped.

However, according to this, when the main valve is normally closed, the pilot valve remains open because it is not unlocked. Therefore, although the main valve is closed, the front and back of the main valve remain in communication with each other via the flow path in the pilot valve, and therefore, strictly speaking, the liquid supply stop device 10 is not in the liquid supply stop state. No. As a result, even after the metering valve 8 is closed, the oil in the loading arm 9, which extends in the horizontal direction, gradually leaks out through the pilot valve. When transferring, use the loading arm 9 above.
The remaining oil may leak to the outside, or an undetermined amount of extra liquid may be supplied to the next hatch, which poses problems in terms of safety, accuracy of quantitative liquid supply, etc.

Therefore, the present applicant further proposes that the main valve and the pilot valve of the liquid supply stop device 10 are hydraulically operated after the metering valve 8 is closed during normal times, according to the Utility Application No. 16710/1983 entitled “Liquid Supply Stop Device”. We proposed a system that automatically closes the valves one after another and strictly stops the liquid supply.

However, although this prevents the oil from leaking, the loading arm 9 is still sealed with the oil remaining in it, so if the outside temperature rises in this state, the residual oil will leak out. There were problems in that the loading arm 9 expanded and caused strength problems in the loading arm 9, etc., and that the loading arm 9 was oily and heavy, making it difficult to rotate it.

In an emergency, since the oil is shut off at the fluid supply stop device 10, the oil inevitably remains in the loading arm 9 in any case.

Furthermore, according to the two prior applications mentioned above, when opening the main valve for the first time, if the pilot valve is opened by easily operating the handle, the main valve can be opened easily at any time. However, on the other hand, there is a risk that even if a regular worker accidentally touches the handle, the oil may leak out and leak outside.
Another drawback is that a thief can drive the vehicle onto a refueling land and easily manipulate the handle to steal oil from the vehicle.

Therefore, an object of the present invention is to provide a liquid supply stop device that eliminates the above-mentioned drawbacks.

The structure of the present invention includes a valve body provided in the middle of the liquid supply pipe and having a valve seat, a diaphragm extending to define a chamber in the liquid flow path of the valve body, and a main valve body attached to the diaphragm. a main valve which is fixed and whose main valve body moves up and down depending on the magnitude of the liquid pressure in the chamber to open and close the liquid flow path by seating and leaving the valve seat; A liquid supply path communicating with each other, a throttle provided in the liquid supply path, a liquid discharge path provided in the main valve and communicating the chamber with the liquid flow path downstream thereof, and a liquid discharge path provided in the liquid discharge path. The auxiliary valve body moves up and down to take off and sit in the liquid discharge passage, and when the valve is opened, the air in the chamber is discharged through the liquid discharge passage to fill the chamber with liquid, and when the valve is closed, the liquid is discharged. a sub-valve that closes the passage and closes the main valve with a damper action according to the degree of inflow of liquid into the chamber according to the degree of restriction of the throttle; the main valve body and the sub-valve body; a hollow cylindrical shaft which is fitted in common with the cylindrical shaft and which moves up and down substantially integrally with at least the sub-valve body and slidably relative to the main valve body by a predetermined dimension; , a handle shaft having a transmission rod inserted through the valve so as to be freely movable downward, a handle rotatably provided on the valve body and rotatably operated in the opening and closing directions; a link that is rotatably provided and whose distal end engages with and interlocks with the cylindrical shaft; and a link that is provided between the link and the handle shaft so that the two are integrated in the valve opening direction of the main valve body. a clutch mechanism that is rotatable in the opposite direction and separately rotatable in the opposite direction; and a clutch mechanism that is provided above the transmission rod when the main valve is in the open state, and that a locking mechanism portion in which a needle that is inserted into the interior from an upper opening expands a locking member to lock the cylindrical shaft; and a diaphragm membrane that is integrally attached to the needle when the liquid supply level reaches a predetermined position. a first lock release mechanism that displaces the needle to release the lock and close the auxiliary valve with the upward movement of the transmission rod; a rotating member that moves the transmission rod upward so that the upper end of the transmission rod comes into contact with the lower end of the needle through a rotational movement, and the needle is displaced in a direction to release the lock; When the handle is integrally provided and is rotated in the valve closing direction, the rotating member is rotated so that the rotating member moves the transmission rod upward together with the handle shaft that rotates separately from the link. and a second lock release mechanism section consisting of a pressing member that causes the lock to be locked.

Therefore, according to the liquid supply stop device of the present invention,
Instead of a pilot valve that drives the main valve to open and close, a sub-valve that only drives the main valve to close is provided so that it can be moved in the closing direction by the operation of the lock release mechanism, and under normal conditions, liquid supply ends when the metering valve is closed. When all the oil in the loading arm has leaked into the hatch, the lock release mechanism is manually operated to close the sub valve and the main valve in sequence, so that no oil remains in the loading arm. In addition, in an emergency, the sub-valve, which is unlocked by the liquid level upper limit position detection signal, moves down and closes, and then the main valve is opened by the hydraulic pressure of the liquid flowing into the chamber above the sub-valve via the throttle valve. Closing the valve with a damper effect,
This prevents water hammer from occurring in the case of emergency valve closing, and when opening the main valve, the main valve and the auxiliary valve are moved upward almost integrally to open the main valve, rather than only the auxiliary valve being moved up by the handle operation. By adopting a valve configuration, at least in an emergency, after the main valve closes, hydraulic pressure acts on the main valve, making it impossible to operate the handle as described above, making it impossible to open the main valve. It can prevent theft.

Next, one example thereof will be explained.

FIG. 2 is a partially cutaway front view of one embodiment of the liquid supply stop device according to the present invention, and FIG. 3 is a partial view taken along the line - - in FIG. 2.

In the figure, the liquid supply stop device 21 has a valve body 22 and an upper casing 23 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 22d below the chamber 22c.

A diaphragm membrane 24 serves as a diaphragm, and is stretched inside the valve body 22 to define an upper chamber 25 and a lower chamber 26 . Reference numeral 27 denotes a throttle valve provided on the side wall of the upper casing 23, which throttles the flow rate of the oil liquid supplied from the inlet 22a to the upper chamber 25.

A main valve 28 is composed of the valve seat 22d and a main valve body 29 fixed to the center of the diaphragm membrane 24. The main valve body 29 has a cylindrical portion 29-1 (valve body portion 29a
skirt portion 29-2 (center hole 29b, counterbore hole 29c, valve seat 29d, liquid flow path 2)
9e) on the top surface of the diaphragm membrane presser 29.
-3 (having an upper end abutting part 29f) are fixed to each other, and are biased downward by a coil spring 30 with a spring force f via a sub-valve body 35, which will be described later.
9a is seated on the valve seat 22d. Reference numeral 31 denotes a spring receiver, which is urged downward by a coil spring 32 with a spring force F, and is fitted and housed in the counterbore hole 29c of the skirt portion 29-2 while being pressed against the stop ring 33. Note that the spring force F is larger than the sum of the weight W of the main valve body 29 and the sub-valve body 35 and the spring force f (F>W+f).

A sub-valve 34 is composed of a valve seat 29d of the skirt portion 29-2 and a sub-valve body 35. The sub-valve body 35 is biased downward by the coil spring 30 and is seated on the valve seat 29d to close the valve.

36 is a hollow cylindrical shaft, which has a center hole 36a, an upper hole 26b, an intermediate step 36c, a lower step 36d, and a stop ring 37. It is fitted into the receiver 31 and the hole 23a of the upper casing 23 in common and separately from the sub-valve body 35 so as to be vertically movable. The cylindrical shaft 36 moves downward due to its own weight in FIGS. 2 and 4, and stops when the stop ring 37 comes into contact with the sub-valve body 35. At this time, the intermediate step portion 35c is spaced apart from the lower surface of the sub-valve body 35 by a dimension l-1, and the lower step portion 35d is spaced apart from the lower surface of the spring receiver 31 by a dimension l-2. (However, l-2<l-1) Reference numeral 41 denotes a transmission rod, which is fitted into the center hole 36a from below the cylindrical shaft 36 so as to be relatively movable up and down. is stopped in contact with a pressing piece 48, which will be described later.

42 is a rotatable handle shaft, and the push lever 4
3 (shown in FIGS. 3 and 4), a handle 44, a pressing pin 45 that constitutes a second lock release mechanism 65 shown in FIGS. The first clutch portion 46 (shown with diagonal lines in FIG. 6) is fixed. The handle 44 is biased downward in FIG. 2 by a torsion spring 38 (shown in FIG. 3).

Reference numeral 47 denotes a forked link, which is separately rotatably fitted to the handle shaft 42, and as shown in FIGS. It has a pressing piece 48, a spring plate 49, and a second clutch part 50 (shown with satin finish in FIG. 6) consisting of a pair of fan-shaped convex parts. The link 47 has a notched groove 47a on the tip side connected through a pin 51 at the bottom of the cylindrical shaft 36, and operates in conjunction with the cylindrical shaft 36, so that when the valve is closed as shown in FIGS. 2, 4, and 5, the link 47 rotates counterclockwise. Located at the limit of direction rotation.

Reference numeral 52 denotes a locking mechanism unit, which is integrally fixed to the diaphragm membrane 53 of the upper casing 23 and is connected to the cylindrical shaft 3.
The needle 54 (having a tapered part 54a) inserted into the cylindrical shaft 36 from the upper opening of the cylindrical shaft 36, the ball 55 housed in the upper hole 36b of the cylindrical shaft 36, and the ring member 61 above the center hole 23a. Become.

Reference numeral 62 denotes a first lock release mechanism section, which consists of the diaphragm membrane 53 (forced downward by the coil spring 63), an upper chamber 23a and a lower chamber 23b defined by the diaphragm membrane 53, and the upper chamber 23a and the lower chamber 23b. 2
3a is communicated with a liquid level detection pipe 64 as shown in FIG. 4, and the lower chamber 23b is opened to the atmosphere through a vent 23c.

Reference numeral 65 denotes a second lock release mechanism, which includes a pressing pin 45 fixed in the direction orthogonal to the axis of the handle shaft 42 as shown in FIG. More, link 4
A spring plate 49 fixed to 7 with a bolt 67 biases the pressing piece 48 clockwise. That is, the pressing piece 48 is rotatably provided on the link 47 so as to come into contact with the lower end of the transmission rod 41, and by rotating clockwise, the upper end of the transmission rod 41 is pressed against the needle 54.
The transmission rod 41 is moved upward so that the needle 54 is displaced in the unlocking direction.
Further, when the handle 44, which is provided integrally with the handle shaft 42, is rotated in the valve closing direction (counterclockwise), the pressing pin 45 is pressed together with the handle shaft 42, which rotates separately from the link 47. Rotate the pressing piece 48 clockwise so that the piece 48 moves the transmission rod 41 upward. When the link 47 is at its counterclockwise rotation limit as described above, the pressing piece 48 is just interposed between the spring plate 49 and the lower end of the cylindrical shaft 36, as shown in FIGS. 4 and 5.

68 is a flow divider valve, as shown in Figs. 2 and 4, the lower chamber 2
A valve body 71 is provided in the middle of a diversion path 69 that divides the flow between the flow outlet 6 and the outlet 22b, and is biased downward by a spring 70. In FIG. 4, the valve body 71 is seated on the valve seat to be in the closed state, and the lower end rod 71a is facing away from the pressing lever 43 of the handle shaft 42.

Reference numeral 72 denotes a ventilator as a negative pressure generating section, which is provided in the middle of the branch channel 69 as shown in FIGS. 2 and 4.
The branch pipe 64a of the liquid level detection pipe 64 is opened.

Next, the operation will be explained. Figures 2 and 4
The figure shows a state in which the metering valve 8 is closed and the oil in the loading arm 9 is discharged as described later, and then the sub valve 34 and the main valve 29 are closed by operating the handle 44. 6, the handle 44 is operated to move the first clutch portion 46 to the second clutch portion of the link 47 as shown in FIG.
In this state, the handle 44 is rotated clockwise. Then, since the link 47 integrally rotates in the same direction due to the engagement of the clutch, the cylindrical shaft 36 is interlocked and displaced upward. At this time, first, the cylindrical shaft 36 has a slight dimension l-
2 moves upward independently, and the lower step part 36d is connected to the spring receiver 31.
comes into contact with. Here, since the coil spring 32 (force F), the main valve body 29 and the sub-valve body 35 (weight W), and the coil spring 30 (force f) have a relationship of F>W+f as described above, the cylindrical shaft 36 continues to As the coil spring 32 moves upward, the main valve body 29 remains undeformed.
Then, the sub-valve body 35 integrally moves upward against the coil spring 30, the main valve body portion 29a is separated from the valve seat 22d, and the main valve 28 is opened. When the main valve body 29 moves upward by the dimension a, the contact portion 29f of the diaphragm retainer 29-3 comes into contact with the lower surface of the upper casing 23 as shown in FIG. 7 and stops. Therefore, from now on, the cylindrical shaft 3
6 compresses and deforms the coil spring 32 integrally with the spring receiver 31 while compressing the coil spring 32 to a small size (l-1 minus l-
2) The intermediate stage portion 36c is moved upward and comes into contact with the lower surface of the sub-valve body 35. Further, the cylindrical shaft 36 is connected to the spring receiver 3
1. The sub-valve body 35 moves upward by a predetermined distance integrally with the sub-valve body 35, and the sub-valve body 35 leaves the valve seat 29d, and the sub-valve 34 opens. This allows the inlet 22a to flow through the main valve 28.
The oil begins to flow into the drop pipe 11 via the main valve 28, and liquid supply is started, and the upper chamber 25 also flows through the throttle valve 2.
7, and flows out through the auxiliary valve 34 and the liquid outflow path 29e. Note that the reason why the sub-valve 34 is opened to allow the oil to flow is to exhaust the air in the upper chamber 25 and fill the oil.If air remains in the upper chamber 25, The hydraulic pressure and damper action for closing the main valve 28, which will be described later, cannot be obtained.

At the same time that the cylindrical shaft 36 reaches its upper limit of movement, the seventh
In the drawing, the tapered portion 54a of the needle 54 presses the ball 55 against the ring member 61, so that the cylindrical shaft 36 is locked in the upward movement position in the drawing. Furthermore, when the cylindrical shaft 36 starts to move upward, the transmission rod 41
The transmission rod 41 is also pushed upward by the pressing piece 48, and the upper end of the transmission rod 41 comes into contact with the lower end of the needle 54, as shown in FIG. When the link 47 further rotates, the spring plate 4
Since the spring force of spring 9 is weaker than that of coil spring 63, transmission rod 41 relatively presses pressing piece 48 downward. Therefore, the pressing piece 48 rotates counterclockwise against the spring plate 49 and finally reaches the position shown in FIGS. 7 and 8.

On the other hand, when the handle 44 is rotated, the pressing lever 43 presses and displaces the valve body 71 upward via the rod 71a of the flow dividing valve 68, opening the flow dividing valve 68, as shown in FIG. Since the handle shaft 42 and the pressing lever 43 are held in the downward rotational positions shown in FIGS. 7 to 9 by the biasing force of the torsion spring 38, the diversion valve 68 is maintained in the open state. Therefore, a part of the oil in the chamber 26 passes through the branch channel 69 to the outlet 22b.
, and the function of the bench lily 72 generates negative pressure in the branch pipe 64a. 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 64 is not blocked by the liquid level, so the air sucked by the branch pipe 64a due to the generation of negative pressure is The liquid is replenished from the opening of the liquid level detection pipe 64, and the upper chamber 23a never becomes a 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 64 is blocked, air supply from the pipe 64 side is cut off and the inside of the upper chamber 23a is air is sucked in and the pressure becomes low. Here, since the lower chamber 23b is always at atmospheric pressure, the diaphragm membrane 53 moves upward against the spring 63. That is, the first lock release mechanism 62 is activated, the needle 54 is moved upward, and the lock mechanism 52 is unlocked. In this way, the cylindrical shaft 36 is moved down by the predetermined amount by the spring 30, the sub-valve body 35 is seated on the valve seat 29d, the sub-valve 34 is closed, and the cylindrical shaft 35 is seated on the valve seat 29d. The shaft 36 is further moved downward relative to the main valve body 29 by the coil spring 32, and the stopper ring 37 comes into contact with the upper surface of the sub-valve body 35, so that there is a distance l-1 between the intermediate stage portion 36c and the lower surface of the sub-valve body 35, and the distance is lowered. A separation dimension l-2 is respectively formed and restored between the step portion 36d and the lower surface of the spring receiver 31.

Thereafter, the main valve body 29 is moved down together with the cylindrical shaft 36 and the sub-valve body 35 by the coil spring 30 and the hydraulic pressure in the upper chamber 25, but the amount of liquid in the upper chamber 25 is reduced when the sub-valve 34 is closed. Since the amount of oil is gradually increased according to the amount of oil flowing in from the inlet 22a through the throttle valve 27, the main valve body 29 acts as a damper and gradually increases as the amount of oil increases. The main valve body 29a is moved downward and is seated on the valve seat 22d as shown in FIG.
is closed and fluid supply is stopped. Therefore, the main valve body 2
Since the valve 9 moves downward gently, water hammer does not occur when the valve is closed, and the metering valve 8, flow meter 7, etc. are not adversely affected by the water hammer. Further, the downward movement speed of the main valve body 29 can be easily varied by adjusting the degree of throttling of the throttle valve 27.

When the cylindrical shaft 36 moves downward, the link 47 also rotates counterclockwise and returns to the position shown in FIG. The rotation returns to the position shown in FIG. 4, and the valve body 71 moves down the flow dividing valve 68 to close it. During the downward movement of the valve body 71, the transmission rod 41 also moves downward away from the lower end of the needle 54, but the pressing piece 48 of the link 47 is rotated back clockwise by the spring plate 49 and comes into contact with the lower part of the cylindrical shaft 36. It returns to contact, resulting in the configuration shown in Figure 4.

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 29, so the handle 44 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. The reason why the handle 44 cannot be operated after the valve is closed in an emergency as described above is because the main valve body 29 and the sub-valve body 35 are lifted almost integrally by operating the handle 44, which is different from the conventional method. If only the pilot valve is opened first, the main valve can also be easily opened even after the valve is closed in the above-mentioned emergency.

The liquid supply stop device 21 configured as described above is configured such that when the liquid level is displaced to a predetermined position, the opening of the liquid level detection pipe 64 is closed and the upper chamber 23 of the diaphragm membrane 53 is closed.
Since the first lock release mechanism section 62 is configured to operate due to the differential pressure generated between the lower chamber 23b and the lower chamber 23b,
It operates reliably even with a low pressure liquid level detection signal.

Further, the needle 54 is displaced by the displacement of the diaphragm membrane 53 of the first lock release mechanism section 62, and the lock by the lock mechanism section 52 is released by the displacement of the needle 54. No great force is required for displacement.

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 seventh
In the figure, since the first lock release mechanism 62 does not operate at all, the main valve 28 and the auxiliary valve 34 remain open. Therefore, the oil remaining in the loading arm 9 in FIG.
1. At the same time, the oil in the upper chamber 25 also flows through the sub valve 3.
4 and the drop pipe 1 via the liquid outflow path 29e.
1.

After the operator waits for a while until the residual oil is completely drained, the operator presses the handle 44 as shown in FIG.
Rotate and return counterclockwise as indicated by the dotted arrow.
Then, as is clear from the configuration of the same figure, even if the first clutch portion 46 rotates in the same direction, the clutch is not engaged, and the link 47 rotates together with the cylindrical shaft 36 as shown in FIGS. 7 to 9. While remaining locked in position, only the handle shaft 42 and handle 44 rotate in the same direction to reach the same position as shown in FIG. 4. Therefore, the first
As shown in Fig. 0, the pressing pin 45 contacts and presses the right end of the pressing piece 48 while rotating in the same direction (the configuration of the clutch portion at this time is shown in Fig. 11). Start rotating clockwise,
The transmission rod 41 is pressed upward and the needle 54 is moved upward.

That is, the second lock release mechanism section 65 operates,
Finally, the needle 54 moves upward by a predetermined distance to release the pressure on the ball 55.

Therefore, in FIG. 7, the cylindrical shaft 36 is released from the lock by the locking mechanism 52, and starts to move downward by the spring 30 from the position shown in FIG. 34 closes, then main valve 2
8 closes.

At the same time, the link 47 also rotates counterclockwise and returns to the position shown in FIG. 4, and the pressing piece 48 also separates from the pressing pin 45 and comes into contact with the lower part of the cylindrical shaft 36, resulting in the configuration shown in FIG. 4.

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.

As described above, according to the liquid supply stop device of the present invention, instead of the pilot valve for driving the main valve to open and close, a sub-valve exclusively used for closing the main valve is operated in the valve-closing direction by the lock release mechanism. As a result, the lock release mechanism is manually activated to close the auxiliary valve and the main valve in sequence only when the oil in the loading arm spills out at the end of liquid supply when the metering valve is closed during normal operation. , there is no oil remaining in the loading arm, and there is no risk of the oil expanding due to an increase in outside temperature and damaging the loading arm, improving durability, and the loading arm is filled with oil. Because it is lightweight and easy to operate, the loading arm can be easily operated, improving work efficiency. Also, when closing the valve in an emergency, the secondary valve closes first based on the liquid level upper limit position detection signal, and then the flow is restricted to the upper chamber of the secondary valve. Since the main valve has a damper effect and is gently closed by the hydraulic pressure of the liquid flowing in through the valve, damage to the piping system can be prevented without causing water hammer, and the valve can be closed by operating the handle. When the main valve is closed, the main valve and the sub-valve are moved up almost integrally, rather than only the sub-valve being moved up first, so that, at least in an emergency, after the main valve closes, hydraulic pressure acts on the main valve, making it difficult to operate the handle. This prevents the main valve from opening due to the inability to operate the handle, which prevents the oil from leaking or being stolen due to incorrect operation of the handle. On the other hand, it has the advantage of being able to know the above-mentioned emergency situation and knowing what to do immediately to inspect the metering valve, etc.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a general liquid supply and shipping device.
Fig. 2 is a longitudinal sectional view of one embodiment of the liquid supply stop device according to the present invention, Fig. 3 is a partial view taken along the line - - in Fig. 2, and Figs. 4 and 7 are the above-mentioned devices, respectively. FIGS. 5, 8 and 10 are partial side views, FIGS. 6, 9 and 11 respectively showing the operation of the second lock release mechanism of the above device. FIG. 3 is a partial side view showing the operation of the handle shaft and the clutch portion of the link, respectively, of the above device; DESCRIPTION OF SYMBOLS 1...Liquid supply shipping device, 8...Dosing valve, 9...Loading arm, 10, 21...Liquid supply stop device, 11...Drop pipe, 13...Hatch,
14, 64... Liquid level detection pipe, 22... Valve body, 24, 53... Diaphragm membrane, 27... Throttle valve, 28... Main valve, 31... Spring receiver, 34...
...Sub-valve, 36...Cylindrical shaft, 36c...Middle stage part,
36d...Lower step section, 41...Transmission rod, 42
...Handle shaft, 45...Press pin, 46,50
...Clutch portion, 47...Link, 48...Press piece, 52...Lock mechanism section, 62...First lock release mechanism section, 65...Second lock release mechanism section, 68...Diversion valve , 72... Bench lily.

Claims (1)

[Scope of utility model registration request] a valve body provided in the middle of a liquid supply pipe and having a valve seat;
A diaphragm is provided to define a chamber in the liquid flow path of the valve body, and a main valve body is fixed to the diaphragm, and the main valve body moves up and down according to the magnitude of the liquid pressure in the chamber. A main valve that sits on and off a valve seat to open and close a liquid flow path, a liquid supply path that communicates the chamber with the liquid flow path upstream thereof, a throttle provided in the liquid supply path, and a throttle provided in the main valve. A liquid discharge passage that communicates the chamber with a liquid flow passage on the downstream side thereof, and a sub-valve body provided in the liquid discharge passage move up and down to take off and sit in the liquid discharge passage, and when the valve is opened, the liquid discharge passage opens in the liquid discharge passage. of air is discharged through the liquid discharge passage to fill the chamber with liquid, and when the valve is closed, the liquid discharge passage is closed to allow the liquid to flow into the chamber according to the degree of restriction of the throttle. a sub-valve that closes the main valve with a damper action in response to the above, and a sub-valve that is inserted into the main valve body and the sub-valve body in common, and is substantially integrally connected to at least the sub-valve body and is connected to the main valve; The body includes a hollow cylindrical shaft that moves up and down slidably relative to a predetermined dimension, a transmission rod inserted into the cylindrical shaft so as to be able to move up and down, and a transmission rod that is rotatably provided in the valve body. Open,
a handle shaft having a handle that is rotatably operated in a valve closing direction; and a link that is rotatably provided separately from the handle shaft and whose tip engages and interlocks with the cylindrical shaft. , a clutch provided between the link and the handle shaft and capable of rotating both integrally in the direction in which the main valve body is opened, and separately rotating the two in the opposite direction; a mechanism, and a needle provided above the transmission rod and fitted into the interior of the cylindrical shaft from the upper opening when the main valve is in the open state expands the locking member and locks the cylindrical shaft. When the lock mechanism section and the liquid supply level reach a predetermined position, the diaphragm membrane attached integrally with the needle moves upward and displaces the needle to release the lock and close the sub-valve. A first lock release mechanism is rotatably provided on the link so as to contact the lower end of the transmission rod, and the rotational action brings the upper end of the transmission rod into contact with the lower end of the needle, and the needle A rotary member that moves the transmission rod upward so as to displace the transmission rod in the direction of releasing the lock is integrally provided with the handle shaft, and when the handle is rotated in the valve closing direction, the rotation member is provided separately from the link. A liquid supply stop device comprising: a second lock release mechanism comprising a rotating handle shaft and a pressing member that rotates the rotating member so that the rotating member moves the transmission rod upward; .