JP2875771B2 - Liquid supply and discharge device for tank trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply and discharge device for a tank lorry which is preferably used for supplying and discharging liquid to and from a tank body of a tank lorry for transporting liquid fuel such as gasoline and kerosene.

[0002]

2. Description of the Related Art Generally, a tank body is provided in a tank lorry and stores a liquid, and a supply and discharge port provided at a lower side of the tank body and opened downward to supply and discharge the liquid into and from the tank body. A bottom valve case in which one side serves as a valve seat plate and is fixed to the lower end side of the supply / discharge port, and the other side serves as a connection portion for external piping; and an opening formed in the valve seat plate of the bottom valve case. 2. Description of the Related Art There is known a liquid supply / discharge device for a tank lorry vehicle comprising a bottom valve body which is raised and lowered in the supply / discharge port so as to open and close the supply / discharge port.

[0003] In this kind of conventional liquid supply / discharge device for tank trucks, for example, when an oil liquid (liquid) such as gasoline, light oil or kerosene is discharged from a tank body into an underground tank or the like of a gas station. By moving the bottom valve body upward in the supply / drain opening and opening the opening of the bottom valve case, the oil liquid in the tank body is allowed to flow from the supply / drain opening through the opening of the valve case through the opening of the valve case. While being discharged into the bottom valve case, and then unloaded into an underground tank of a gas station via an external pipe or the like connected to a connection portion of the bottom valve case.

On the other hand, when the oil liquid is supplied into the tank body, the opening of the bottom valve case is opened by the bottom valve body in the same manner as when the oil liquid is discharged, and the oil liquid is supplied to the bottom by a pump or the like via the external piping. The valve body is loaded into the tank body from the supply / discharge port.

Here, a ring-shaped projection is formed on the upper side surface of the valve seat plate, for example, so as to surround the outer periphery of the opening of the bottom valve case, and the projection is formed on the lower end side end surface of the bottom valve body. An annular seal member or the like is provided at a portion corresponding to the portion. When the opening of the valve seat plate is closed by the bottom valve body, the sealing member of the bottom valve body is seated on the projection of the valve seat plate, and the space between the valve seat plate and the bottom valve body is sealed. The oil is held to prevent the oil liquid in the tank body from leaking outside through the opening of the bottom valve case.

[0006]

In the above-described liquid supply / discharge device for a tank truck, the annular seat portion of the valve seat plate of the bottom valve case surrounds the outer peripheral side of the opening of the bottom valve case. Since the opening of the bottom valve case is opened by the bottom valve body, and the liquid in the tank body is discharged to the outside from the supply / drain port, the protrusion is formed on the valve seat plate. There is a problem that liquid may remain in the surroundings or the like, and a great deal of labor is required for cleaning the tank body when replacing the liquid contained in the tank body.

In particular, when a chemical such as toluene (hereinafter referred to as "dangerous substance") is accommodated in the tank body and discharged to the outside, the dangerous substance remains on the valve seat plate by the projection. When another chemical (liquid) is supplied into the tank body in such a state, the liquid and the hazardous substance are mixed, and a chemical reaction or the like occurs. And may pose a problem that workers and the like are exposed to danger.

In order to avoid the above-mentioned danger, it is necessary to remove the liquid remaining in the tank body by washing or the like, which makes such a washing operation complicated and troublesome. There is a problem that it takes time and the workability is reduced.

Further, for example, Japanese Patent Publication No. Sho 56-312No.
(Hereinafter referred to as other conventional technologies)
A supply / drain opening that opens toward the side, and the supply / drain
The valve seat plate that has become the inlet (opening) is
Attach through the flange part, and on the upper surface of the valve seat plate
A ring-shaped valve seat that surrounds the outer periphery of the inflow port
The valve seatUpAnd the bottom valve body
A disclosed tank lorry bottom valve is disclosed.

However, even in such another conventional technique, an annular recess is formed on the periphery (mounting flange portion) side of the valve seat plate at a position radially outward of the valve seat seal. When discharging the liquid, there is a problem that the liquid remains in these depressions.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can discharge all the liquid from the tank body when the opening of the valve seat plate is opened, and solve the problems such as residual liquid. It is an object of the present invention to provide a liquid supply / discharge device for a tank lorry vehicle, which can be easily eliminated and can easily and reliably perform a cleaning operation and the like in a tank main body after discharging a liquid.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tank truck which is provided in a tank lorry and accommodates a liquid, and which is provided on a lower side of the tank body. A supply / drain port opened downward to supply / discharge liquid, a bottom valve case in which one side is fixed to the lower end side of the supply / drain port as a valve seat plate, and the other side is a connection portion for external piping, The present invention is applied to a liquid supply / discharge device for a tank lorry vehicle comprising a bottom valve body which is raised and lowered in the supply / discharge port so as to open and close an opening formed in a valve seat plate of the bottom valve case.

The feature of the structure adopted by the invention of claim 1 is that the valve seat plate of the bottom valve case is formed as a flat surface.
The upper surface formed, and located radially inward of the upper surface
An annular groove formed by surrounding the opening from outside;
Formed shallower than the annular groove by surrounding the outer circumference of the groove from the outside
Provided with a notched groove, an annular valve seat seal is provided in the annular groove, and the valve seat seal is prevented from coming off in the notched groove.
Presser ring that is substantially flush with the upper surface of the valve seat plate
The provided, further wherein the bottom valve member is in the provision of the ring-shaped protrusion that away seated on the valve seat seal.

With this configuration, the valve seat plate
Check that the valve seat seal provided in the annular groove is not
This can be performed by a holding ring provided in the groove.
Hold the holding ring together with the valve seat seal with the upper surface of the valve seat plate.
They can be arranged on the same plane. And
Open the opening by separating the bottom valve from the valve seat plate of the bottom valve case.
In this case, the liquid in the tank body can be discharged from the supply / drain port to the bottom valve case side , and when the liquid level of the tank body approaches the upper surface of the valve seat plate , this liquid is discharged to the valve seat. From the radial outside of the seal through the upper surface of the valve seat seal inward can flow toward the opening side,
The upper surface of the valve seat plate kills with prevention from remaining liquid. Further, by seating the annular ridges on the valve seat seal when closed bottom valve body, can in retained between the bottom valve body and the valve seat seal hermetically, ensuring the opening of the valve seat plate Close to
It is possible that.

Further, according to a second aspect of the present invention, there is provided a lid having the bottom valve body, wherein the ring-shaped projection is provided on a lower end side and an operating member for opening and closing operation is connected to an upper end side. An auxiliary valve that is formed as a cylindrical valve body and that is opened and closed in the bottom valve body from below the bottom valve case and that opens and closes the opening of the valve seat plate by being seated on and off the valve seat seal. I have a body.

With this configuration, when the liquid in the tank body is normally supplied and discharged, the opening of the valve seat plate can be opened and closed by the bottom valve body operated by the operating member. The opening of the valve seat plate can be opened and closed by an auxiliary valve element operated from the lower side of the bottom valve case.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid supply / discharge device for a tank truck according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 5 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a tank body mounted on a tank truck. The tank body 1 is defined by partition walls 2 into a plurality of liquid chambers 3, 3 (only two are shown). In the chamber 3, as a liquid, for example, a chemical such as toluene,
Alternatively, an oil liquid such as gasoline or kerosene is stored. And the bottom 1A which is the lower side of the tank body 1
Each of the cylindrical supply / discharge ports 1B whose base end side is opened in each liquid chamber 3 and whose front end side (lower end side) protrudes downward.
(Only one is shown) is formed. In addition, the supply and discharge port 1
At the lower end of B, an annular flange portion 1 is formed radially outward.
C is extended, and a bottom valve case 4 described later is integrally attached to the flange portion 1C.

Reference numeral 4 denotes a bottom valve case provided on each supply / discharge port 1B side of the tank main body 1. The bottom valve case 4 is formed of a substantially L-shaped tube, and one side thereof has a radially outward portion. A thick valve seat plate 5 extending in an annular shape is integrally formed, and an annular connecting flange 6 as a connecting portion is integrally formed on the other side.
The valve seat plate 5 has an opening 5A on the inner peripheral side located at the center thereof. Further, a boss portion 4A protruding in a substantially horizontal direction is formed at an intermediate portion of the bottom valve case 4.

Here, the upper surface 5B of the valve seat plate 5 is formed as a flat surface as shown in FIGS. 2 to 5, and its radially inner portion surrounds the outer peripheral side of the opening 5A from the outside. An annular groove 5C having a substantially concave cross section;
Form a substantially L-shaped cross section so as to surround the outer periphery of C from outside ,
A notched groove 5D that is shallower than the annular groove 5C is formed. The valve seat plate 5 has an annular flange portion 5E at a portion radially outside the notch groove 5D, and the flange portion 5E is integrated with a flange portion 1C of the tank body 1 via a bolt (not shown) or the like. It is fixed in a state.

Reference numeral 7 denotes a valve seat seal provided on the valve seat plate 5 of the bottom valve case 4. The valve seat seal 7 is formed in a ring shape from a resin material or the like, and is provided in an annular groove 5C of the valve seat plate 5. It is fitted via a holding ring 8 described later. Here, as shown in FIG. 2 to FIG.
It is formed in a substantially rectangular cross section so as to correspond to the shape of C, and its thickness dimension is set to match the groove depth of the annular groove 5C. Thereby, the valve seat seal 7 has an upper surface 7A slightly smaller than the upper surface 5B of the valve seat plate 5 (for example,
Notched groove 5D of depth of only) Ru is disposed at a lower height position <br/>.

Reference numeral 8 denotes a press ring. The press ring 8 is formed as a ring-shaped thin plate, and is fixed in a cutout groove 5D of the valve seat plate 5 via a bolt (not shown) or the like. The holding ring 8 has its inner peripheral end formed with the notch groove 5D and the annular groove 5D.
The valve seat seal 7 is prevented from coming off by slightly extending radially inward from the boundary with C. Also,
The upper surface of the holding ring 8 is provided with a valve as shown in FIGS.
The upper surface 5B of the seat plate 5 should form a continuous flat surface with each other.
Are arranged on substantially the same plane (the same plane).

Are four columns (2) extending upward and downward in a cylindrical shape in the supply / discharge port 1B of the tank body 1.
The support 9 has a male thread 9A (the lower end is not shown) and the like at the upper and lower ends, and the lower end is integrated with the valve seat plate 5 of the bottom valve case 4. Is mounted. Then, the male screw portion 9A which is located on the upper side of each strut 9, the upper holder 10 to be described later via a nut 9 B as shown in FIG. 5 is attached.

10 is opposed to the upper surface 5B of the valve seat plate 5,
An upper holder attached to the upper end of each support 9 is shown. The upper holder 10 is formed in a stepped cylindrical shape, and a cylindrical portion 10B having a female thread portion 10A formed on the inner peripheral side at the center thereof faces upward. It is projected. The upper holder 10 can rotate the valve shaft 14 so that a male screw portion 14A of the valve shaft 14 described later is screwed into the cylindrical portion 10B so that the bottom valve body 11 can be separated and seated on the valve seat plate 5. Is held in an appropriate state.

Reference numeral 11 denotes a bottomed cylindrical bottom valve body which is located in the tank body 1 and is separated from and seats on the valve seat seal 7. The bottom valve body 11 has a diameter substantially corresponding to the valve seat seal 7. A cylindrical valve part 11A, a disk-shaped lid part 11B integrally formed on the upper end of the cylindrical valve part 11A,
1B, a small-diameter fitting cylindrical portion 1 protruding upward from the central portion.
1C.

Here, as shown in FIGS. 2 to 5, a ring-shaped projection 11D having a substantially semicircular cross section is formed integrally with the cylindrical valve portion 11A of the bottom valve body 11 as shown in FIGS. 1
When the seat 1 is seated on the valve seat seal 7, the ring-shaped projection 11D elastically presses the upper side surface 7A of the valve seat seal 7, thereby improving the sealing property between the bottom valve body 11 and the valve seat plate 5. The opening 5A of the valve seat plate 5 is securely closed. The upper surface of the lid 11B is formed as an inclined surface that is inclined downward from the radially inner side to the outer side.

A plurality of screw holes 11C extending radially away from each other in the circumferential direction are formed in the peripheral wall of the fitting cylindrical portion 11C.
1 and 11C1 are formed, and the respective screw holes 11C1 are formed.
Bolts 12 and 12 (only two of them are shown) are screwed into. Then, the tip of each bolt 12 is connected to the fitting cylinder 1.
The bottom valve body 11 is rotatably mounted on the distal end side of the valve shaft 14 by projecting to the inner peripheral surface of the valve shaft 1C and engaging with an annular groove 14B of the valve shaft 14 described later.

Further, on the outer periphery of the lower end side of the cylindrical valve portion 11A,
A pair of claw portions 11E, 11 E are projected radially outward. Each claw portion 11E has a tip 9
Is formed in a substantially concave curved shape so as to correspond to the outer shape of the support ring 8 and engages with the outer peripheral surfaces of a pair of columns 9 opposed to each other in the radial direction of the holding ring 8 so that the bottom valve body 11 rotates together with the valve shaft 14. Regulations. As a result, the bottom valve body 11 is held in a detented state by the columns 9 and the tank body 1
To open and close the opening 5A of the valve seat plate 5.

Reference numeral 13 denotes an operation mechanism. The operation mechanism 13 includes a valve shaft 14 as an operation member for opening / closing operation connected to the fitting cylinder portion 11C side of the bottom valve body 11, and an upper end side of the valve shaft 14. And an operation shaft 27 and an operation handle 26 described later. Here, the valve shaft 14 is provided on the outer periphery of the intermediate portion with the male screw portion 1 screwed into the female screw portion 10A of the upper holder 10.
4A is formed, and a U-shaped mounting bracket 14C is integrally formed at the upper end thereof.

The outer periphery of the valve shaft 14 is
Located between the tip of the male screw 14A and the lower end of
An annular groove 14B having a substantially concave cross section is formed in the circumferential direction, and the groove width of the annular groove 14B substantially corresponds to the diameter of each bolt 12.

Reference numeral 15 denotes a closed cylindrical emergency valve element as an auxiliary valve element which is located in the bottom valve element 11 and separated from and seats on the valve seat seal 7. A tubular portion 15A having a smaller diameter than the opening 5A, a lid portion 15B integrally formed at the upper end portion of the tubular portion 15A and having an outer diameter slightly larger than an inner diameter of the valve seat seal 7, A pair of bosses 15C, 15C projecting downward from the center of the lower surface of the lid 15B and connected to the upper end of a slide bar 20 described later.
It is roughly composed of

Here, as shown in FIGS. 2 to 5, an annular projection 15D projects downward from the outer periphery of the lid 15B, and when the lid 15B is seated on the valve seat seal 7, The annular projection 15D is provided on the upper surface 7 of the valve seat seal 7.
By elastically pressing A, the sealing property between the lid 15B and the upper surface 5B of the valve seat plate 5 is reliably maintained, and the opening 5A of the valve seat plate 5 is securely closed.

The emergency valve element 15 is always in the valve-open position (the state shown in FIG. 5). In this state, the tank 5 is located between the opening 5A of the valve seat plate 5 and the outer peripheral surface of the cylindrical part 15A. A small gap is formed to allow the oil liquid in the main body 1 to flow out to the bottom valve case 4, and in a case of emergency, the rotating lever 18 is operated to set the valve in the valve closing position (the state of FIG. 4). It has become.

Reference numeral 16 denotes a drive shaft. The drive shaft 16 is inserted into the bottom valve case 4 through the boss 4A in the horizontal direction.
It is rotatably supported in the boss portion 4A, and its front end side protrudes from the bottom valve case 4 as a rectangular column portion 16A having a substantially square cross section. The drive shaft 16 constitutes an emergency closing unit together with a bell crank 17, a rotating lever 18, a slide bar 20, and the like, which will be described later.

Reference numeral 17 denotes a drive shaft 16 from outside the bottom valve case 4.
The bell crank for rotating the bell crank is shown.
7 is fixed to the protruding end side of the drive shaft 16 whose one end side protrudes outside from inside the bottom valve case 4.

Reference numeral 18 denotes a turning lever provided in the bottom valve case 4 so as to turn integrally with the drive shaft 16. The turning lever 18 is engaged with a prism 16 A of the drive shaft 16. A cylindrical portion 18A having a square hole 19 having a substantially quadrangular cross section formed on an inner peripheral side thereof; and the bell crank 17 from the cylindrical portion 18A.
And a lever 18C, 18C projecting from the cylindrical portion 18A at an angle of about 90 degrees with respect to the bell crank 17 and the stopper 18B. , The rotating lever 1
The cylindrical portion 18 </ b> A of 8 has a square column portion 16 </ b> A of the drive shaft 16 fitted in the square hole 19, and is fixed to the drive shaft 16 in a detented state.

Reference numeral 20 denotes a slide bar which is suspended downward from the emergency valve body 15, and the upper end of the slide bar 20 is rotatably connected to a boss 15C of the emergency valve body 15 via a pin 21. The side extends into the bottom valve case 4 via the opening 5A of the valve seat plate 5. The lower end of the slide bar 20 is rotatably connected to a lever portion 18C of the rotary lever 18 via a pin 22.

Reference numeral 23 denotes a wire connected to the bell crank 17, and one end of the wire 23 is connected to, for example, an emergency lever 24 provided at the rear of the vehicle as shown in FIG. When the wire 23 is rotated in the direction indicated by the arrow A in FIG. 1, the wire 23 is pulled in the direction indicated by the arrow B, and the emergency operation is performed via the bell crank 17, the drive shaft 16, the rotation lever 18, the slide bar 20 and the like. The valve body 15 is rotated to the valve closing position (the state shown in FIG. 4).

Numeral 25 denotes a cylindrical filter whose upper end is fixed to the outer peripheral portion of the upper holder 10 and whose lower end is fixed to the upper side surface 5B of the valve seat plate 5. It filters the oil liquid flowing out from the inside into the supply / discharge port 1B.

Reference numeral 26 denotes an operation handle rotatably provided on the upper portion 1D of the tank main body 1.
Is mounted on the upper end side of the operation shaft 27, and the operation shaft 27 is connected to a mounting bracket 14C of the valve shaft 14 via a pin 28 or the like. The operation shaft 27 is connected to the operation handle 2
The valve shaft 14 is turned in response to the turning operation of the valve 6, and the opening 5 </ b> A of the valve seat plate 5 is opened and closed.

An air introduction valve (not shown) is provided in the upper part 1D of the tank body 1 for each liquid chamber 3, and the air introduction valve opens when each supply / discharge port 1B is opened. Thus, air is allowed to flow into the liquid chambers 3 to prevent the inside of the tank body 1 from being in a negative pressure state, so that the oil liquid in each liquid chamber 3 can be smoothly discharged.

The liquid supply / discharge device for a tank truck according to the present embodiment is configured as described above, and as shown in FIG. 1, replenishes the oil liquid from each liquid chamber 3 of the tank body 1 to the underground tank 29 of the gas station. Sometimes supply and discharge pipes 3 for external piping
0 is connected to the connection flange 6 of the bottom valve case 4, and the operator climbs on the upper part 1 </ b> D of the tank body 1 and rotates the operation handle 26 to thereby operate the valve shaft 14 via the operation shaft 27.
To rotate.

At this time, the valve shaft 14 is screwed into the female thread portion 10A of the upper holder 10, and slides on the annular groove 14B side of the valve shaft 14 with respect to the tip end of each bolt 12, and the bottom valve body. Each of the 11 claw portions 11E engages with the outer peripheral surface of each column 9 and slides upward.

As a result, the bottom valve body 11 moves upward in the tank body 1 while being held in a detented state by the columns 9, and the ring-shaped projection 11D of the bottom valve body 11 is moved by the movement of the valve shaft 14. The valve seat seal 7 is separated from the upper surface 7A,
The inside of the liquid chamber 3 communicates with the inside of the underground tank 29 via the bottom valve case 4 and the supply / discharge pipe 30. At this time, on the upper 1D side of the tank body 1, the air introduction valve is also opened by the operation handle 26, so that even if the liquid level in the tank body 1 changes, the internal pressure of the tank body 1 does not change. Instead, the oil liquid in the liquid chamber 3 smoothly flows into the underground tank 29.

Here, the upper surface 7A of the valve seat seal 7 is flat.
Height slightly lower than the upper surface 5B of the valve seat plate 5
Presser ring that is disposed at
The upper surface of the bush 8 is substantially flush with the upper surface 5B of the valve seat plate 5.
Since the oil liquid in the tank body 1 is disposed, even when the liquid level of the oil liquid falls from the inside of the tank body 1 to the inside of the supply / drain port 1B and further approaches the upper side surface 5B, the oil liquid is Opening 5A on upper side 7A from radial outside to inside
Can flow smoothly into the interior.

Since the upper surface of the upper holder 10 is formed as an inclined surface, the oil liquid remaining on the upper holder 10 can also be discharged from the radially inner side to the outer side toward the valve seat plate 5 side. . As a result, when the valve is opened, as shown in FIG. 5, the oil liquid in the tank body 1 can be entirely discharged into the bottom valve case 4 from the supply / discharge port 1B in the direction of arrow C.

Further, in an emergency such as when the supply / discharge pipe 30 is disconnected between the tank body 1 and the underground tank 29 or when the supply / discharge pipe 30 is damaged, the emergency lever 2 is used.
4 to pull the wire 23 in the direction of arrow B in FIG. 1, the drive shaft 16 via the bell crank 17 rotates the rotating lever 18 and the slide bar 20 moves the emergency valve 1
5 is held in the valve closed position as shown in FIG. At this time, the space between the emergency valve body 15 and the upper surface 7A of the valve seat seal 7 is held in a sealed state via the projection 15D.
This ensures that the opening 5A of the valve seat plate 5 is closed,
The supply and discharge of oil and the like from the supply and discharge port 1B can be stopped at the same time, and the danger of gasoline and the like being scattered around can be minimized.

On the other hand, in order to supply the oil liquid into the tank body 1, a supply pipe (not shown) is connected to the connection flange 6 of the bottom valve case 4, and the opening of the valve seat plate 5 is opened in the same manner as when discharging. The operation is performed by opening the portion 5A and the air introduction valve, and forcing the oil liquid into the tank body 1 from the connection flange 6 side by a pump or the like (not shown). After the supply of the oil liquid is completed, the operation of the operation handle 26 causes the valve seat plate 5 to move the upper surface 7A of the valve seat seal 7 via the ring-shaped protrusion 11D.
By seating on the top, the opening 5A of the valve seat plate 5 can be reliably closed, and the oil liquid in the tank body 1 is reliably prevented from leaking from the opening 5A to the bottom valve case 4 side. can do.

Thus, according to the present embodiment, when the oil liquid in the tank body 1 is discharged, the opening 5A of the valve seat plate 5 is opened by the bottom valve body 11 so that the oil liquid in the tank body 1 is opened. Without being left on the valve seat plate 5,
Can be entirely discharged to the outside via the bottom valve case 4, the supply / discharge pipe 30 and the like.

Therefore, after draining a liquid such as an oil liquid or a chemical, only a small amount of liquid or the like adhering to the inner wall surface of the tank main body 1 is cleaned, and the inside of the tank main body 1 is cleaned without remaining liquid. It can be maintained in a state of being converted. Thus, as described in the related art, when supplying the liquid into the tank main body 1, it is possible to reliably prevent the danger that the dangerous substance and the like remaining in the tank main body 1 are mixed with the liquid. As a result, the safety of the worker can be ensured, and the removal (cleaning) operation of the liquid can be performed in a short time, so that the workability can be greatly improved.

[0052]

As described in detail above, according to the present invention, the upper surface of the valve seat plate provided in the bottom valve case is formed as a flat surface, and the valve seat plate has An annular groove and a shallow cutout groove are provided around the opening and
An annular valve seat seal is provided in the annular groove, and the
To prevent the valve seat seal from coming off and to the upper surface of the valve seat plate.
Because it is configured to provide a holding ring that is approximately the same plane ,
When the opening of the valve seat plate open I by the bottom valve body,
The liquid in the tank main body can be entirely discharged to the bottom valve case side without remaining in the tank main body. Therefore, after discharging the liquid, the residual liquid can be reliably removed from the tank main body only by cleaning the liquid adhered to the inner wall or the like of the tank main body, and the safety at the time of work can be enhanced. together, they can also easily row Ukoto only in a short time cleaning operation and the like in the tank main body, it is possible to greatly improve the workability.

Further, since the bottom valve body is provided with the ring-shaped projection which is detachably seated on the valve seat seal, the opening of the valve seat plate can be reliably opened and closed by the bottom valve body.
Leakage of liquid from inside the tank body can be reliably prevented.

Further, according to the second aspect of the invention, in an emergency or the like, the opening of the valve seat plate is opened and closed by opening and closing the auxiliary valve provided in the bottom valve from below the bottom valve case. The valve can be closed, and the outflow of liquid from inside the tank body can be immediately blocked.

[Brief description of the drawings]

FIG. 1 is an overall view showing a liquid supply / discharge device for a tank lorry according to an embodiment of the present invention, together with a tank lorry.

2 shows the liquid supply / drainage device in FIG. 1;
FIG. 2 is an enlarged sectional view taken along line II.

FIG. 3 is a sectional view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is an enlarged view of a main part showing a state where an opening of a valve seat plate shown in FIG. 3 is opened by a bottom valve body.

FIG. 5 is an enlarged view of a main part showing a state where an opening of a valve seat plate shown in FIG. 3 is closed by an auxiliary valve body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body 1A Bottom 1B Supply / discharge port 4 Bottom valve case 5 Valve seat plate 5A Opening 5B Upper surface 6 Connection flange (connection part) 7 Valve seat seal 7A Upper surface 11 Bottom valve body 11D Ring projection 14 Valve shaft (operation) 15) Emergency valve element (auxiliary valve element) 15D Projection 29 Underground tank 30 Supply / discharge pipe (external pipe)

Claims (2)

(57) [Claims] 1. A tank body provided on a tank truck and containing a liquid, a tank body provided on a lower side of the tank body,
A supply / drain port opened downward to supply / discharge liquid into / from the tank body, one side serving as a valve seat plate fixed to the lower end side of the supply / drain port, and the other side serving as a connection portion for external piping. In a liquid supply / discharge device for a tank lorry vehicle, the liquid supply / discharge device includes a bottom valve case and a bottom valve body that moves up and down inside the supply / discharge port to open and close an opening formed in a valve seat plate of the bottom valve case . the valve seat plate before Kisokoben case, formed as a flat surface
An upper surface and the opening located radially inward of the upper surface.
An annular groove formed so as to surround from the outside, and an outer periphery of the annular groove
Cut from the outside so as to be shallower than the annular groove.
And Ketsumizo provided, said in an annular groove an annular valve seat sealing, perform retaining the valve seat seal to the notch-groove the
Provide a holding ring that is almost flush with the upper surface of the valve seat plate,
Further, the bottom valve body liquid supply and discharge device for a tank lorry vehicle, characterized in that a ring-shaped protrusion that away seated on the valve seat seal to. 2. The bottom valve body is formed as a covered cylindrical valve body provided with the ring-shaped protrusion on a lower end side end surface and an operation member for opening and closing operation connected to an upper end side. 2. The tank lorry according to claim 1, further comprising: an auxiliary valve body that is opened and closed from below the bottom valve case and that opens and closes the opening of the valve seat plate by being separated from and seated on the valve seat seal. Liquid supply / discharge device for vehicles.