JPH0972429A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve having excellent opening/closing control performance. SOLUTION: A valve is provided with a housing 33 in which a liquid flow-in/ flow-out window 33B is formed, a guide stem 36, a valve body 34 for opening/ closing the liquid entrance/exit port of a valve main body 32, sealing gaskets 34D and 34E attached to the outer peripheral surface thereof, a spring 35 for closing the entrance/exit port by always pressing the valve body 34 downward and an operation handle 37A for opening the entrance/exit port by operating the valve body 34 upward. Valve seats 33E and 33F positioned in the upper and lower parts of the flow-in/ flow-out window 33B are provided in inner circumferential surface of the housing 33, the sealing gaskets 34D and 34E respectively contacted closely to the valve seats 33E and 33F are provided in the outer peripheral surface of the valve body 34 and the outer diameters of the sealing gaskets 34D and 34E are set smaller than the inner diameter of the housing placed upward more than the valve seats 33E and 33F on which the gaskets are seated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve, and more particularly to a valve which is mounted on the bottom surface of a tank of a tank truck or the like and is used for supplying a liquid to a tank or discharging a liquid from the tank. .

[0002]

2. Description of the Related Art A conventional valve of this type is attached to the bottom of a tank such as a tank truck for carrying petroleum such as gasoline and light oil. When petroleum is loaded on a tank truck at an oil tank or the like, conventionally, a system has been adopted in which a hatch for refueling provided on the upper portion of the tank truck is used for refueling. However, this refueling method is a method in which the worker climbs to the upper part of the tank of the tank truck and opens the hatch, and inserts the tip of the refueling hose into the tank to refuel. It is not preferable from the viewpoint of safety as it is a work, and it is not preferable because oil etc. evaporates into the atmosphere from the open hatch and pollutes the atmosphere and dust in the atmosphere mixes into the tank tank from the hatch. . Therefore, in recent years, in consideration of work safety, prevention of air pollution, revision of the Fire Service Law, etc., the above-mentioned ground refueling system has been switched to as shown in FIG.

Therefore, a ground refueling system will be described with reference to FIG. When refueling petroleum from the tank truck TR into the underground tank T of a gas station such as a gas station, a valve (see FIGS. 5 and 6), which will be described later, attached to the tank bottom of the tank truck TR is opened, and the refueling hose is opened. Underground tank T for oil etc. of tank truck via H
I am trying to refuel. The tank truck TR usually has a plurality of tanks, for example, five tank tanks A, B, C, D and E.
The tanks A, B, C, D, and E can be loaded with different types of oil. And, each of the tanks A, B, C, D, E has a valve on the bottom surface.
The valves are attached one by one, and these valves are connected to one pipe P. Therefore, when transferring the oil of any tank to the underground tank T, the oil is transferred through the pipe P. Further, although not shown, when various kinds of oil are supplied from the tank at the oil tank to each tank tank of the tank truck TR, the oil is loaded on the tank truck TR by the reverse operation.

The valve of the tank truck TR has a special structure according to regulations such as the Fire Service Act, for example, the one shown in FIGS. 5 and 6. The valve 1 shown in FIG. 5 is an old type that has been used since the time of refueling from the tank of the tank truck TR. As shown in the figure, the valve 10 includes a bottom valve body 12 attached to a flange ring 11 attached to an outer surface of a tank bottom surface TB via a flange portion 12A, and a flange portion 12A of the bottom valve body 12. The housing 13 mounted from the inside of the tank T ′, the valve body 14 that moves up and down in the housing 13, and the valve rod 14A of the valve body 14 are mounted between the upper surface of the housing 13 and the valve body 13 so as to surround the valve rod 14A. And a spring 15 that is formed. The valve rod 14A penetrates a hole 13A formed in the center of the upper surface of the housing 13, and the guide bush 1 is provided between the valve rod 14A and the hole 13A.
6, the valve body 14 is smoothly moved up and down via the guide bush 16 and the valve rod 14A, and the oil passage 12 of the bottom valve body 12 is provided.
B is opened and closed. The operating rod 17 and the operating handle 17A are used for this opening and closing. That is, a hole 14B is formed in the center of the lower surface of the valve body 14, and the upper end of an operating rod 17 that vertically penetrates the bottom valve body 12 is fitted into this hole 14B. Then, one end of an operation handle 17A is engaged with the lower end of the operation rod 17, and the outflow port 12B is opened and closed by operating the operation handle 17A to move the valve body 14 up and down. Further, a plurality of outflow / inflow windows 13B are formed on the circumferential surface of the housing 13 at equal intervals along the circumferential direction, and when the valve body 14 moves upward to open the outflow / inflow port 12B, oil flows through the inflow / outflow window 13B. It goes into and out of the tank T'through. Reference numeral 12C is an oil outflow port, and a branch pipe of a pipe P of a tank truck TR shown in FIG. 4 is connected to the oil outflow port. Further, 18 is a sheet packing, and 19 is a screen for preventing the outflow of dust in the tank tank.

However, the valve 10 shown in FIG. 5 has the following problems. That is, the valve 10 closes the outflow port 12B by the spring force (biasing force) of the spring 15. Tank truck TR
When refueling from the refueling hatch of this valve 1
There was no problem with 0, but after switching to the above-ground refueling system, fuel is supplied from the bottom of the tank tank, so when refueling into a predetermined tank tank, operate the operation handle 17A of the valve 10 of the tank tank to operate the valve. When the body 14 is pushed up and the outflow port 12B of the bottom valve body 12 is opened, and then oil is supplied into the tank tank, the oil supply pressure is increased by the spring 15 in the other valve 10.
The valve 14 is pushed up against the urging force of the other tank, and unnecessary oil is supplied to other tank tanks as well. Had a problem that it could refuel less than required amount.

A valve 20 shown in FIG. 6 has been developed in order to solve the above problems. This valve 20 is one in which the oil of the bottom valve main body is introduced into the housing, and the oil introduced into the housing balances the pressure inside the housing and the pressure of the bottom valve main body to eliminate the above-mentioned inconvenience. This is called a balance type valve. This valve 2
As shown in the figure, the housing 23 of No. 0 is formed in a cylindrical shape, and the valve body 24 is housed therein. This valve body 2
4, the upper portion 24B is formed in a piston shape, the lower portion thereof is entangled, and the lower end portion 24C is formed in a hollow shape having a diameter-expanded shape larger than that of the piston-shaped upper portion 24B. Communicate with the housing 23. The upper and lower portions 24B are formed with two upper and lower grooves in the circumferential direction on the outer peripheral surface thereof, and a seal packing 24D having a special structure (V-shaped cross section) is attached to each groove. The seal packing 24D shuts off the space between the bottom valve body 22 and the tank tank. Grooves are also formed near the upper and lower ends of each groove, and a piston ring 24E made of tetrafluoroethylene resin or the like is attached to each groove. These piston rings 24E prevent the valve body 24 from swinging when it moves up and down. Further, a radial bracket 24F is formed below the twisted portion of the valve body 24, a spring 25 is elastically mounted between the upper end of the valve body 24 and the upper surface of the housing 23, and the operating rod 27 is provided at the lower end thereof.
The upper ends of are engaged. Since the other parts are configured according to the valve 10, the reference numerals for other parts are omitted.

Therefore, in the case of this balance type valve 20, the outflow port 22B is always in the housing 2 even when it is closed.
Since it is in communication with the valve 3, even if the valve 20 is closed or one of the other valves 20 is operated, the oil flowing into the pipe P passes through the valve body 24 in the closed state from the outflow port 22B into the housing 23. Therefore, there is no possibility that pressure is applied to the valve element 24 from the housing 23 side and the other valve 20 is opened due to the biasing force of the spring 25. Further, as shown in FIG. 6, the seal packing 24D of the valve body 24 is V
When the valve body 24 is formed in a letter shape and moves upward or when the valve body 24 moves downward, one of the upper and lower seal packings 24D opens the V groove to the outside by friction with the inner peripheral surface of the housing 23, Airtightness between the upper portion 24B of the body 24 and the housing 23 can be prevented more reliably.

[0008]

However, in the case of the conventional balance type valve 20, as described above,
The seal packing 24 is used when the valve body 24 is opened or closed.
Since a large frictional force is generated between the inner peripheral surface of the housing 23 and D, a large spring force is needed to overcome the frictional force of the seal packing 24D when the valve 20 is closed. The spring 25 having a large spring force must be attached. Therefore, in the case of the valve 20 shown in FIG.
Since the spring 25 having a large spring force is attached, the operation handle 27A must be operated with a heavy force that is the sum of the large spring force and the frictional force of the seal packing 24D. Two
Since it is performed by a wire (not shown) connected to 7A,
There is a problem that the worker is forced to perform a great deal of manual labor. Moreover, since opening and closing of the valve element 24 involves a large frictional force, the operation resistance is large in an emergency and the valve 20 is instantaneously opened.
There was a problem that you could not open and close. Also,
Since the seal packing 24D has a special structure and is not compatible with each other, there is a problem that the cost is high and the seal packing 24D cannot be obtained from a specific manufacturer and it is inconvenient when it is necessary to replace it urgently.

Any conventional valve 10, 20
The bottom ring body 12 and the flange rings 11 and 21 in which the housings 13 and 23 are attached to the outside of the tank bottom surface TB.
Since it is sandwiched by the flange portions 12A, 22A of the bottom valve main body 12, 22, the consumables such as the seat packings 18, 28 must be detached from the tank T'when the consumables are replaced. Moreover, since this work is carried out under the car, there is a problem that the workability is extremely poor.

The present invention has been made in order to solve the above-mentioned problems. The spring force is small, and the opening / closing operation of the valve body can be performed extremely smoothly. Therefore, the manual labor of the operator can be remarkably reduced when the valve body is opened. Further, when closing, liquid is introduced into the housing, which constantly presses the valve element downward due to the difference in hydraulic pressure, and provides a valve with excellent open / close controllability that does not open together with the biasing force of the spring. That is the first purpose. A second object is to provide a valve in which the consumable items stored in the housing can be replaced very easily without removing the valve body. A third object is to reduce the spring force, to prevent wear, and to use a versatile seal member at low cost without requiring a seal member having a special structure.
The purpose of this is to provide a valve in which the seal member can be easily procured and replaced.

[0011]

According to a first aspect of the present invention, there is provided a valve body having a valve body, a housing connected to an outflow inlet of the valve body at a lower end thereof, and a liquid inflow / outflow window formed on a peripheral surface thereof. A valve body that moves up and down in the housing to open and close the outlet / inlet of the valve body; a spring that constantly urges the valve body downward to close the outlet / inlet; and a biasing force against the spring. A valve mounted on the bottom surface of the container, the valve body being formed as a bottomed piston and the bottom surface of the valve body having the operation handle for operating the valve body upward to open the flow path. A communication hole for communicating the valve body and the housing is provided, and the projected area of the upper portion of the piston is set to be larger than the projected area of the lower portion.

[0012] According to a second aspect of the present invention, there is provided a valve body, a housing which is connected to an outlet / inlet port of the valve body at a lower end thereof, and has a liquid inflow / outflow window formed on a peripheral surface thereof, and the housing. A valve body that moves up and down in the inside to open and close the outlet / inlet of the valve body, a seal member attached to the outer peripheral surface of the valve body, and the valve body to which the seal member is attached is always urged downward. A valve mounted on the bottom surface of the container, comprising a spring for closing the outflow inlet and an operating handle for operating the valve body upward to open the flow path against the biasing force of the spring. , Valve seats located above and below the inflow / outflow window are provided on the inner peripheral surface of the housing, and a seal member, which is in close contact with each valve seat when the valve body is seated, is provided on the outer peripheral surface of the valve body. It is characterized in that provided, respectively.

Further, a valve according to a third aspect of the present invention is a valve body, a housing connected to an outlet / inlet port of the valve body at a lower end and having a liquid inlet / outlet window formed on a peripheral surface thereof, and the housing. A valve stem that hangs from the center of the upper surface of the valve, a tubular portion into which the guide stem fits, and a valve body that moves up and down in the housing according to the guide stem to open and close the outlet / inlet port of the valve body; A seal member attached to the outer peripheral surface of the valve body, a spring for constantly urging the valve body to which the seal member is attached to close the outflow / outlet port, and the spring against the urging force of the spring. A valve mounted on the bottom surface of the container, which comprises an operating handle for operating the valve element upward to open the outflow / inflow port, and Provided on the outer peripheral surface of the valve body are seal members that are respectively in contact with the valve seats that are located below, and the outer diameters of the seal members that are above the seats on which they are seated. It is characterized by being set smaller than the inner diameter of the housing.

A valve according to a fourth aspect of the present invention is a valve body, a housing connected to an outlet / inlet port of the valve body at a lower end and having a liquid inflow / outflow window on a peripheral surface thereof, and the housing. A valve body that is housed in a vertically movable manner and that opens and closes the outflow inlet of the valve body, a seal member that is attached to the outer peripheral surface of the valve body, and the valve body that has the seal member attached is always attached downward. It was equipped with a spring that urges it to close the outflow port, and an operating handle that operates the valve element upwards to open the outflow port against the urging force of the spring, and is attached to the bottom of the container. In the valve, the upper end portion of the housing is divided from the housing body, and the upper end portion is provided as a lid so as to be detachable from the housing body.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The valve of the present invention will be described below based on the embodiments shown in FIGS. In each of the drawings, FIG. 1 is a sectional view showing an axial cross section of an embodiment of the valve of the present invention, showing a closed state, and FIG. 2 is a sectional view showing the valve shown in FIG. 1 in an open state. 3 is a cross-sectional perspective view showing the relationship between the bottom valve body, the housing and the valve body of the valve shown in FIG.

As shown in FIG. 1, the valve 30 of the present embodiment includes a flange ring 31 attached to the outer surface of the tank bottom surface TB, and a valve body 32 attached to the tank bottom surface TB via the flange ring 31. The housing 33 is connected to the outflow port 32B of the valve main body 32 at the lower end and has a liquid (for example, gasoline) inflow / outflow window 33B formed on the peripheral surface thereof. A valve body 34 that opens and closes the outflow port 32B, a spring 35 that constantly urges the valve body 34 downward to close the outflow port 32B, and the spring 3
5 is provided with an operating handle 37A that pushes up the valve body 34 against the spring force (urging force) of the valve 5 to open the outflow port 32B of the valve body 32, and into each tank tank of the tank truck TR (see FIG. 3). It is configured to supply gasoline or discharge gasoline from the tank tank.

The housing 33 allows the bottom valve bodies 12, 22 of the conventional valves 10, 20 shown in FIGS. 5 and 6 to be used as they are. And the housing 33
The upper end portion is divided from the housing main body 33A, and the upper end portion is configured as a lid body (cover) 33C. The cover 33C is attachable to and detachable from the housing body 33A. When the cover 33C is attached, bolts are fastened to the outer edge of the cover 33C through bolt holes (not shown) formed at equal intervals. A guide stem 36 that hangs from the cover 33C along the axis of the housing 33 is attached to the center of the inner surface of the cover 33C by a bolt 36A. Therefore, the housing 33 can easily replace the later-described seal packing mounted in the housing 33 by simply removing the cover 33C, and does not have to perform the troublesome work of removing the valve body 32 from the tank tank as in the conventional case. I am doing it.

The lower end of the housing 33 is open, and its inner diameter is set to be substantially the same as the inner diameter of the valve body 32. A flange portion 33D is formed on the outer peripheral surface of the lower end of the housing 33, and the flange portion 33D is sandwiched between the flange ring 31 and the flange portion 32A of the valve body 32. In this state, the valve body 32 is bolted to the flange ring 31. Further, a groove into which the lower end of the housing 33 is fitted is formed in the connecting portion of the valve body 32 with the housing 33, and the lower end of the housing 33 is fitted into this groove, and the seat packing 38 is inserted between the lower end surface of the housing and the groove. The seat packing 38 prevents gasoline from leaking.

Further, on the inner peripheral surface of the housing 33, there are formed tapered surfaces 33E and 33F which are located above and below the inflow / outflow window 33B and are inclined downward, and these tapered surfaces 33E and 33F are formed on the valve body 34. It is configured as a valve seat. Therefore, in the following description, the upper tapered surface 33E will be referred to as the upper valve seat 33E, and the lower tapered surface 33F will be referred to as the lower valve seat 33F. The inner diameter of the tapered surface of the upper valve seat 33E at the lower end is set to be larger than the inner diameter of the lower surface of the tapered surface of the lower valve seat 33F. Therefore, the inner diameter of the housing 33 is the largest on the upper side of the upper valve seat 33E, and then gradually decreases toward the lower side of the respective valve seats 33E and 33F, and gradually decreases.

The valve element 34 seated on each of the valve seats 33E and 33F is formed in a bottomed tubular piston shape as shown in FIGS. 1 to 3, and a tubular portion 34A extending upward from the inner center of the bottom surface thereof. The guide stem 36 is fitted into the tubular portion 34A from the upper end side, and the upper end of the operation rod 37 is fitted from the lower end side. And these cylindrical parts 3
4A and the guide stem 36 so as to surround the spring 3
5 are armed. The valve body 34 moves up and down according to the guide stem 36, and the valve body 34 is prevented from swinging to the left and right during this time. That is, the valve body 34 is prevented from swinging due to the action of the guide stem 36 when it moves up and down.
Further, the bottom surface of the valve element 34 has a plurality of communication holes 34 in the radial direction.
B are formed at equal intervals, and the valve main body 32 and the housing 33 communicate with each other through these communication holes 34B. Therefore, the valve 30 is configured as a balanced valve in which gasoline flows into the housing 33 regardless of opening / closing of the valve element 34.

Further, a groove along the circumferential direction is formed at each of the upper and lower ends of the outer peripheral surface of the valve element 34, and the seal packing 3 is provided in each groove.
When 4D and 34E are mounted and the valve element 34 is at the lower end,
As shown in FIG. 1, the seal packings 34D and 34E are seated on the upper and lower valve seats 33E and 33F to seal the outflow / inflow window 33B of the housing 33 and close the valve 30. The outer diameter of the upper portion (upper end of the valve element 34) of the upper seal packing (hereinafter, referred to as “upper seal packing”) 34D is larger than the outer diameter between the upper and lower grooves, and the lower seal packing (hereinafter, “lower seal packing”). The outer diameter of the lower portion of the seal packing 34E (the lower end of the valve body 34) is set smaller than the outer diameter between the upper and lower grooves, and the projected area of the upper end of the valve body 34 is smaller than the projected area of its lower end. It is getting bigger. Therefore, when gasoline flows into the housing 33, a pressure difference is generated between the housing 33 and the valve body 32, and a force pressing the valve body 34 downward acts, and the biasing force of the spring 35 has no pressure difference. It is designed to be smaller than time. still,
As is apparent from FIGS. 5 and 6, in the conventional valves 10 and 20, the outer diameter of the upper ends of the valve bodies 14 and 24 is smaller than the outer diameter of the lower ends thereof.

In addition, the outer diameter of the upper seal packing 34D is slightly smaller than the inner diameter of the upper housing 33 of the upper valve seat 33E, and the outer diameter of the lower seal packing 34E is lower.
F Upper housing 33 inner diameter (that is, inflow / outflow window 33B
It is set to be slightly smaller than the inner diameter of the vertical frame that separates. Therefore, when the valve 30 is opened and closed, the upper and lower seal packing 34
D and 34E do not come into sliding contact with the inner peripheral surface of the housing 33, and are configured to be less likely to wear. Also, the valve body 34 itself does not contact the inner peripheral surface of the housing 33 during the opening / closing operation, and both 3
A slight gap is formed between the housings 3 and 34, and the inside and outside of the housing 33 are configured to communicate with each other via the inflow / outflow window 33B. Further, each of the seal packings 34D and 34E is composed of a normal O-ring so that a standard product such as JIS standard can be used. Therefore, there is no need to use a custom-made product as in the past, and it is possible to procure easily.

Next, the operation will be described. For example, as shown in FIG. 4, when supplying gasoline from the tank truck TR to the underground tank T of the filling station, after connecting the refueling hose H to the pipe P of the tank truck TR, the operation handle 37A is operated to operate. Valve body 34 through rod 37
Is pushed up against the biasing force of the spring 35. At this time, the outer diameters of the seal packings 34D and 34E of the valve element 34 are larger than those of the respective valve seats 33E and 33F.
3 is set smaller than the inner diameter, and since the valve element 34 moves upward in accordance with the guide stem 36, the valve element 34 does not swing, and each seal packing 34D, 34E contacts the inner peripheral surface of the housing 33. Instead, the inflow / outflow port 32B is opened to communicate the inside of the tank tank with the valve body 32 through the inflow / outflow window 33B, and gasoline is transferred from the tank tank to the underground tank T via the inlet / outlet port 32B of the valve body 32 and the refueling hose H. leak. Further, the gasoline circulates from the upper valve seat 33E into the housing 33, and is further supplied to the underground tank T from the housing 33 through the communication hole 34B and the valve body 32.

On the contrary, when the valve 30 is closed, when the operating handle 37A is operated to move the operating rod 37 downward, the valve body 34 comes into contact with the inner peripheral surface of the housing 33 by the urging force of the spring 35. It descends smoothly without doing. Moreover, since gasoline is introduced into the housing 33, the force acting from the upper end of the valve body 34 is larger than the force acting from the lower end, and this force assists the urging force of the spring 35, and It smoothly descends to close the flow passage 32B of the valve body 32.

When the valve 30 is used for a long time,
Since the sealing functions of the seal packings 34D and 34E deteriorate, it is necessary to replace them. In this case, after the tank tank is emptied and the tank tank is ventilated, the cover 33C of the housing 33 is removed to open the upper end of the housing 33. Next, the spring 35 and the valve element 34 are taken out of the housing 33, and the seal packing 34D, 3
Replace 4E. Since standard products such as normal O-rings can be used as the seal packings 34D and 34E, they can be easily procured and the seal packing 34 can be manufactured at low cost.
D and 34E can be exchanged.

Therefore, according to the present invention, the valve body 34 is formed as a bottomed piston, and a plurality of communication holes 33B for communicating the valve body 32 and the housing 33 are provided on the bottom surface thereof to form a balanced valve. Further, the valve body 34
Since the projected area of the upper part of the valve is set larger than the projected area of the lower part thereof, when the valve 30 is closed, the force acting from the upper end of the valve body 34 becomes larger than the force acting from the lower end,
A force commensurate with this difference can assist the biasing force of the spring 35, so that even if the spring force is small, the valve body 3
The closing operation of 4 can be performed extremely smoothly. Moreover, when the valve 30 is closed and fuel is being supplied to another tank tank, the housing 3 of the closing valve 30 is connected via the pipe P.
Gasoline is introduced into the valve 3, and the valve body 34 is pressed downward by the above-mentioned pressure difference, and the urging force of the spring 35 is applied to the valve body 34.
Therefore, there is no possibility that gasoline will flow into the tank from the shutoff valve 30. Therefore, the opening / closing controllability of the valve 30 is extremely excellent.

According to the present invention, the valve seats 33E, which are located above and below the inflow / outflow window 33B, are formed on the inner peripheral surface of the housing 33.
33F respectively, and each valve seat 33E, 33F
Since the seal packings 34D and 34E, which are closely attached to each other, are provided on the outer peripheral surfaces of the valve bodies 33E and 33F, respectively, it is possible to replace the seal packings 34D and 34E from the tank tank very easily without removing the valve body 32 from the tank tank. You can

According to the present invention, the valve seats 33E, which are located above and below the inflow / outflow window 33B, are formed on the inner peripheral surface of the housing 33.
33F is provided, and seal packings 34D and 34E that are in close contact with the valve seats 33E and 33F are provided on the outer peripheral surface of the valve body 34, respectively, and the outer diameters of the seal packings 34D and 34E are respectively seated. Three
Since it is set to be smaller than the inner diameter of the housing above 3E and 33F, even if the spring force is small, the opening / closing operation of the valve element 34 can be performed extremely smoothly and instantly, and the opening / closing controllability is excellent, and the manual work of the worker is performed. In addition, since each seal packing 34D, 34E does not come into contact with the inner peripheral surface of the housing 33, each seal packing 34D, 34E is less likely to be worn, and a seal packing having a special structure is not required, which is low cost and compatible. Certain seal packing 34D, 3
4E can be used, which allows the seal packing 3
4D and 34E can be easily procured and replaced.

Further, according to the present invention, the upper end portion of the housing 33 is divided from the housing body 33A, and the upper end portion is provided as the cover 33C so as to be detachable from the housing body 33A. Cover 33C from inside the tank without removing from
By removing the, the valve body 34 can be removed from the inside of the housing 33, and the seal packings 34D and 34E can be replaced very easily.

In the above-described embodiment of the present invention, the case where gasoline is supplied and discharged by the valve 30 attached to the tank truck TR has been described, but the present invention is not limited to the above-described embodiment. For example, the present invention can be applied to a type of valve that is attached to the bottom surface of a container that stores various liquids in addition to a tank. Further, in the above-described embodiment, the structure in which the inflow / outflow window 33B is sealed by the seal packings 34D and 34E when the valve body 34 is closed has been described. By processing, the seal packings 34D and 34E can be omitted. In short, such an invention is included in the invention of the present application without departing from the gist of the invention.

[0031]

According to the first aspect of the present invention, the valve body is formed as a bottomed piston, and the bottom surface thereof is provided with a communication hole for communicating the valve body and the housing.
Moreover, since the projected area of the upper part of the piston is set to be larger than the projected area of the lower part thereof, the closing operation of the valve body can be performed extremely smoothly even if the spring force is small, and liquid is introduced into the housing at the time of closing, It is possible to provide a valve having excellent open / close controllability that always presses the valve element downward due to the difference in hydraulic pressure and does not open it together with the biasing force of the spring.

According to the second aspect of the present invention, the valve seats located above and below the inflow / outflow window are provided on the inner peripheral surface of the housing, and the sealing members are in close contact with the respective valve seats. Since the valves are respectively provided on the outer peripheral surface of the valve body, it is possible to provide a valve in which the consumable items stored in the housing can be replaced very easily without removing the valve body.

According to the third aspect of the present invention, valve seats located above and below the inflow / outflow window are provided on the inner peripheral surface of the housing, and a seal member that is in close contact with the valve seat is provided as the valve element. Since the outer diameter of each of the sealing members is set to be smaller than the inner diameter of the housing above the valve seat on which each seats, the spring force is small and the opening / closing operation of the valve body is extremely smooth. Therefore, it is possible to reduce the manual work of the operator when the valve is opened, have excellent opening / closing controllability, are less likely to wear, and do not require a specially configured sealing member, and use a low cost and versatile sealing member. To provide a valve that allows easy procurement and replacement of the seal member.

According to the fourth aspect of the present invention, the upper end portion of the housing is divided from the housing body, and the upper end portion is provided as a lid so as to be detachable from the housing body. It is possible to provide a valve in which the consumables stored in the container can be replaced extremely easily from the inside of the container without removing the valve body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an axial cross section of an embodiment of a valve of the present invention, showing a closed state.

FIG. 2 is a cross-sectional view showing a state where the valve shown in FIG. 1 is open.

FIG. 3 is a cross-sectional perspective view showing a relationship among a bottom valve body, a housing and a valve body of the valve shown in FIG.

FIG. 4 is an explanatory diagram showing a state where oil is transferred from a tank truck to an underground tank.

FIG. 5 is a view corresponding to FIG. 1 showing an example of a conventional valve.

FIG. 6 is a view corresponding to FIG. 1 showing a balanced valve which is another example of a conventional valve.

[Explanation of symbols]

 30 valve 32 valve body 32B flow path 33 housing 33A housing body 33B inflow / outflow window 33C cover (lid) 33E, 33F valve seat 34 valve body 34A cylindrical portion 34B communication hole 34D, 34E seal packing 35 spring 36 guide stem 37 operation Rod 37A Operation handle

Claims (4)

[Claims] 1. A valve body, a housing having a lower end connected to an outlet / inlet port of the valve body and having a liquid inlet / outlet window formed on a peripheral surface thereof, and an outlet / inlet port of the valve body which moves up and down in the housing. A valve body that opens and closes the valve body, a spring that constantly urges the valve body downward to close the outflow inlet, and a valve body that is operated upward against the urging force of the spring to open the flow path. A valve attached to the bottom surface of the container, wherein the valve body is formed as a bottomed piston, and a communication hole for communicating the valve body and the housing is provided on the bottom surface, and A valve characterized in that the projected area of the upper part of the piston is set larger than the projected area of the lower part. 2. A valve body, a housing having a lower end connected to an outlet / inlet port of the valve body and having a liquid inlet / outlet window formed on a peripheral surface thereof, and an outlet / inlet port of the valve body which moves up and down in the housing. A valve body that opens and closes the valve body, a seal member attached to the outer peripheral surface of the valve body, a spring that constantly urges the valve body to which the seal member is attached downward to close the outflow inlet, and this spring In the valve mounted on the bottom surface of the container, the inlet / outlet window is provided on the inner peripheral surface of the housing, and the operating handle opens the flow passage by operating the valve body upward against the urging force of the housing. And valve seats located above and below, respectively, and
A valve, characterized in that a seal member is provided on an outer peripheral surface of the valve body, the seal member being in close contact with each of the valve seats when the valve body is seated. 3. A valve body, a housing having a lower end connected to an outflow inlet of the valve body and having a liquid inflow / outflow window formed on a peripheral surface thereof, and a guide stem hanging from a center of an upper surface of the housing. A valve body having a tubular portion into which the guide stem fits, and vertically moving in the housing in accordance with the guide stem to open and close an outlet / inlet port of the valve body; and a seal member attached to an outer peripheral surface of the valve body. , A spring that constantly urges the valve body to which the seal member is attached downward to close the outflow inlet, and a spring that operates the valve body upward against the urging force of the spring to operate the outflow inlet. A valve mounted on the bottom surface of the container, which is provided with valve seats located above and below the inflow / outflow window, respectively. A seal member that is in close contact with the valve seat is provided on the outer peripheral surface of the valve body, and the outer diameter of each seal member is set to be smaller than the inner diameter of the housing above the valve seat on which it is seated. Valve characterized by. 4. A valve main body, a housing having a lower end connected to an outlet / inlet of the valve main body, and a liquid outflow / inflow window formed on a peripheral surface thereof, and a housing vertically movably housed in the housing. A valve body that opens and closes the outflow inlet, a seal member attached to the outer peripheral surface of the valve body, and a spring that constantly urges the valve body to which the seal member is attached downward to close the outflow inlet, In the valve mounted on the bottom surface of the container, the upper end of the housing is separated from the housing body by operating the valve body upward against the biasing force of the spring to open the outflow port. A valve which is divided and is provided so as to be detachable from the housing body by using this upper end as a lid.