JPS59151683A - Valve device - Google Patents

Abstract

PURPOSE:To prevent erroneous injection of liquid having lower specific gravity into storage tank, by utilizing a float to open/close a valve in accordance with the specific gravity of liquid. CONSTITUTION:If specific gravity of oil in float chamber 23 is lower than that of float, the float 25 will never float up and a steel ball 30 will never move from a supporting board 28 to discharge depressurized air through a through- hole 24 to the atmosphere. In other word, if specific gravity of oil from tank car is lower than preset level, the valve body 13 has been closed to disable oil injection into the tank while if it is high, said valve 13 will open to inject oil into the tank thus to prevent erroneous injection of oil having low specific gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device, for example, a valve device installed in an oil supply pipe to an oil storage tank in a gas service station or the like.

The oil supplied to the oil storage tanks at gas stations is usually transported by tank trucks, but since tank trucks usually carry different types of oil, such as gasoline, fish oil, and diesel oil, it is difficult to use a specific type of oil. Do not inject a different type of oil into the oil storage tank. In particular, pouring gasoline into a fish oil tank can be extremely dangerous if the oil from the tank is used in a stove or the like.

In view of this point, the present invention controls the opening/closing operation according to the specific gravity of the liquid injected into the liquid storage tank, so that a liquid with a relatively low specific gravity is injected into a liquid storage tank containing a liquid with a relatively high specific gravity. The present invention provides a valve device that prevents this from occurring.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment in which the present invention is applied to an oil filling system for an oil storage tank at a gas station will be described in detail below.

In FIG. 1, reference numeral 1 denotes an oil storage tank buried underground in a gas station or the like, and 2 an oil supply pipe, the tip of which is connected to the main body A of the valve device according to the present invention. B is an air control unit that drives the valve device and is installed at an appropriate location.

Reference numeral 3 denotes a tank lorry, and the tip of its oil supply hose 4 is removably connected to the valve device main body part A by a connecting fitting 5.

Figures 2 to 4 show details of the valve device main body part A, and 6 is a valve box, 7 is a valve chamber, 8 is a secondary boat, 9 is a primary boat,
The secondary boat 8 is connected to the oil supply pipe 2, and the primary boat 9
is closed with a cap 10 when not lubricating (FIG. 2), and is connected to the connecting fitting 5 of the hose 4 of the tank truck 3 when lubricating (FIG. 3).

Reference numeral 11 denotes a handle; in its upright (vA valve) position (Figs. 2 and 4), one end side 11a of the L-shape is located above the cap 10, and in its slanted (valve open) position (Fig. 3), the handle 1
0 to enable connection of the hose 4 to the primary boat 9. Support shaft 11b at the other end of the handle 11
forms the valve body of the handle valve (second valve means), and the valve body 6
is rotatably inserted and held in a hole 12a of a protrusion (valve box of the handle valve) 12 on the side wall of the handle valve. llc is a small diametrical through hole drilled in the valve body 11b, 12c is an air circulation hole provided in the protrusion 12 diametrically opposite to each other with the hole 12a in between (FIG. 2); When is in the vertical (valve closed) position, the small through hole 11c is the air circulation hole 12c.
112 (i), that is, the handle valve is closed (Fig. 2, Fig. 4), and the hand/l/11 is in the inclined (valve open) position (during lubricating), the holes 11c and 1 .2
c 112d and the handle valve is opened (Fig. 3).

13 is a valve body that opens and closes the secondary boat 8 in the valve chamber 7; 14 is a valve shaft; the outer end of which is fixed to one end of a lever 15 outside the valve box 6 (Fig. 4); and the other end of the lever 15. 019 is a piston rotatably connected to the lower end of the piston rod 17 of the air cylinder 16 by a pin 18, and 2o is a spring that moves the piston 19 to the raised position (rod 1) within the cylinder 16.
In this state, the valve body 1
3 closes the secondary boat 8 (Fig. 2).

21 is a bracket that fixes the cylinder 16 to the valve box 6.

22 is a small box attached to the valve box 6 that defines a float chamber 23 therein and has a through pipe 24, and a float 25 is attached to the through tube 24 so as to be slidable up and down within the float chamber 23. A magnet ring 26 is attached to the float 25 so as to surround the through hole v24.

27 is an orifice provided in the through tube 24, which is disposed above the float chamber 23; 28 is a support plate fixed at an appropriate distance below the orifice in the through tube 24, and has an air vent 29; 30 is a small ball (
For example, a steel ball), which is normally supported on the support plate 28, is attracted and raised by the rise of the magnet ring 26, as will be described later, and closes the orifice 27.

31a and 31b are through holes that communicate the float chamber 23 with the valve chamber 7.

When not refueling, as shown in Figure 2, cylinder 1
6 is a switching valve (first valve means) via an air pipe L1.
31 and is open to the atmosphere.

When lubricating the oil storage tank L (assumed to contain fish oil or light oil), tilt the handle 11 to the tilted (valve open) position (Fig. 3), and compressed air will be supplied from the air supply pipe L2. is applied to the buzzer 32 through the handle valve's flow hole 1201 through hole 11C1 flow hole 12d1 and the pipes L5 and L5, and the buzzer sounds.

On the other hand, air flows from pipe L3 to pressure reducing valve 33 and air switch 3.
4. The decompressed air is also supplied to the through pipe 24 of the float chamber 23 via the pipe L4, but since the orifice 27 is open, the reduced pressure air is discharged into the atmosphere from the open end of the pipe 24.

When the cap 10 of the valve box 6 is removed and the hose 4 from the tank truck 3 is connected to start lubricating, since the valve body 19 closes the secondary boat 8, the oil flows into the valve chamber 7 and the float chamber 23.
satisfy.

By the way, the specific gravity of gasoline at room temperature is approximately 0.7, fish oil is approximately 0.8, and diesel oil is approximately 0.85, so the specific gravity d of the float 25 is set to 0.7 (d (preset to 0.8). If the specific gravity of the oil in the float chamber 23 is less than d (in the case of gasoline), the float 23 will not float, so the steel ball 30
does not move from above the support plate 28 and does not close the orifice 27, so the reduced pressure air continues to be discharged to the atmosphere through the through pipe 24.

When the specific gravity of the oil in the float chamber 23 is greater than d (for example, in the case of fish oil), the float 25 floats in the chamber 23, so the magnetic ring 26 sucks up the steel ball 30 and moves it to the orifice 2.
7 (Figure 3). Therefore, the reduced pressure air is supplied to the switch 34.
The high-pressure air in the pipe L5 is sent to the switching valve 31 via the pipe L6, and the valve is switched, and the high-pressure air in the pipe L5 is sent to the cylinder 16 via the pipe L5, the switching valve 31, and the pipe L1, and the piston 19 and the rod are 17 and rotates the valve stem 14 counterclockwise via the lever 15 as shown in Figures 2 and 3 to open the secondary boat 8 (Figure 3), so oil flows through the pipe 2 and into the tank. Injected into l.

That is, if the specific gravity of the oil from the tank truck 3 is lower than the preset value d (for example, in the case of gasoline), it is impossible to fill the tank 1 with the oil because the valve body 13 remains closed. When the specific gravity is greater than the set value d (
For example, in the case of fish oil), the valve body 13 is opened and the oil is filled into the tank l.

When the oil filling is completed and the oil in the valve chamber 7 and float chamber 23 disappears, the float 25 descends and the steel ball 30 also falls, opening the orifice 27, so that the air from the air switch 34 is sent to the switching valve 31. Instead, the through pipe 24
released into the atmosphere. Then, the switching valve 31 is switched back to its original state, so that the cylinder 16 is disconnected from the pipe L5 and opened to the atmosphere. The spring 20 in the cylinder 16 therefore returns the piston 19 and therefore the rod 17 to its original raised and retracted position, and the valve body 13 closes the secondary boat 8 again.

Then, when the hose 4 is removed, the cap l○ is fitted, the primary side boat 9 is closed, and the handle 11 is returned to its original vertical position, the through hole 11c is connected to the air passages 12c and 12d (therefore, the pipe line L
2 and L5) (the handle valve closes), the buzzer 32 also stops sounding.

In addition, the above 5j! In the embodiment, the air switch 34 is configured to send air to the switching valve 31 when the orifice 27 is closed due to the floating of the float 25, and maintain this state until the orifice 27 is opened when the float 25 descends. , the air supply state to the switching valve 31 is changed even after the opening of the orifice until the air supply to the air switch 34 is cut off (i.e., the handle 11 is returned to the vertical (valve closed) position and the handle valve is closed). It is also possible to have a configuration that can maintain up to (up to)

As described above, according to the present invention, it is possible to prevent the inconvenience of accidentally injecting a relatively low specific gravity fluid into a relatively high specific gravity liquid tank or container. This prevents the risk of pumping gasoline into the tank.

Furthermore, since air is used as the driving force, it is safe even when using highly flammable liquids. Furthermore, since the start and end of the lubrication operation are determined by operating the handle valve, the lubrication operation can be performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a state of oil filling an oil storage tank having a valve device according to an embodiment of the present invention, FIG. 2 is a diagram showing the valve device of FIG. The figures show different operating states of the main body of FIG. 2, and FIG. 4 is a right side view of the valve device main body of FIG. 2, showing the handle valve in cross section. A... Valve device main body part, B... Control unit, 6.
... Valve box, 7... Valve chamber, 11... Handle, 13... Valve body, 16... Air cylinder,
23...Float chamber, 25...Float, 2
6... Magnet ring, 27... Orifice, 30.
...Steel ball, 31...Switching valve, 32...Buzzer, 34...Air switch. Atsushi / Figure 3 Atsushi Figure 4

Claims (1)

[Claims] a valve chamber having a secondary boat connected to a liquid storage tank and a primary port for injecting liquid to be sent to the liquid storage tank; and a valve chamber provided within the valve chamber to open and close the secondary port. a valve body that opens and closes the valve body, a valve drive means that is driven by air to open and close the valve body, a pipe line that supplies operating air to the valve drive means, a first valve means that opens and closes the pipe line, and the valve drive means that opens and closes the valve body. It consists of a float chamber communicating with the float chamber, and a float arranged in this float chamber, and the specific gravity of this float a-) is set to a predetermined value smaller than the specific gravity of the liquid stored in the liquid storage tank, and the float The float is configured to float when a liquid having a specific gravity greater than the specific gravity of the front float is present in the chamber, and the first valve means is arranged in association with the float and opens and closes in response to the movement of the float. a second valve means for opening and closing the working air supply pipe upstream of the first valve means, and a manual operating member for the second valve means, the manual operating member disposed in relation to the primary port of the valve chamber, and as long as the manual operation member causes the second valve means to assume the closed position, it is impossible to connect the liquid supply pipe to the primary port; A valve device characterized in that it is configured to close.