JPS6134585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a valve device that prevents the mixing of liquids when unplanned liquids are sent by mistake in a workplace where several types of liquids with different specific gravities are handled. It can be effectively used, for example, at a gas station.

In addition to kerosene, gas stations handle highly flammable gasoline, each of which is stored in underground tanks.

When these oil levels decrease, tank trucks bring in new oil, but sometimes they end up injecting gasoline into the kerosene tank.

If you are not aware of this and use kerosene mixed with gasoline in a kerosene heater, it can flare up and cause a fire, which is extremely dangerous.

In order to solve the above-mentioned problems, the present application provides a valve device that prevents gasoline, which has a specific gravity smaller than that of kerosene, from being mixed into kerosene even if it is accidentally injected.

The illustrated embodiment will be described below.

1 is a valve device, and a cap 4 is normally attached to the upper end opening 3 of the housing 2, and a coupling 6 is attached to the tip of a hose 5, which will be described later, when lubricating.
A pipe 9 extending from an oil storage tank 8 buried underground is connected to the lower end opening 7. A valve chamber 10 is formed in the housing 2, and a valve body 11 is provided.The valve body 11 is integrated with the support shaft 12, so that the housing 2
A lever 13 connected to this support shaft 12 on the outside of the
By operating the valve body 11, the valve body 11 can be rotated within the valve chamber 10 around the support shaft 12,
A valve body 11 is inserted between the upper end opening 3 and the lower end opening 7.
It is possible to communicate (open the valve) or disconnect (close the valve) by using the .

That is, when the lever 13 is in the solid line position in FIG. 3, the valve body 11 is in the open state as shown in FIG. 2, and when it is in the double-dashed line position, it is in the closed state as shown in FIG. It is in a valve state. Note that 23 is a claw formed on a part of the valve body, which has a function to be described later.

Reference numeral 14 denotes a locking mechanism for a lever 13 disposed near the upper end of the housing 2, in which a locking piece 15 is rotatably held by a pin 16 with respect to a holding portion 17 erected on the housing 2; In FIG. 5, it is constantly biased clockwise by a spring 18. This clockwise rotation is restricted by a protrusion 19 formed at the left end of the locking piece 15.

A slope 20 is formed at the right end of the locking piece 15 to facilitate reception of the lever 13, and a recess 21 for locking the lever 13 is formed on the left side of the slope. 22 is a lock release projection.

30 is a float device, 25 is its float, and a float shaft 2 integrated with the float 25
6 is loosely fitted into a hole 27' of an inner wall protrusion 27 of the housing 2 so as to be vertically slidable. 2
8 is an upper ring for restricting the floating of the float 25, which includes the float 25, the float shaft 26, and the retaining ring 28.
The composite specific gravity of the float device 30 is set to be larger than gasoline (0.7) and smaller than kerosene (0.8).

Further, in FIG. 1, the lower end 29 of the float shaft 26 is
When the float device 30 is lowered, the claw 23 is on the rotation trajectory, and the claw 23 rotates counterclockwise, that is, the valve body 11
This prevents the valve from opening. 31 is a tank truck.

In the above configuration, when kerosene is injected into the tank 8 from the tank truck 31, first, remove the cap 4 from the upper end opening 3 (at this time, the lever 13 is in the position shown by the two-dot chain line in Fig. 3). (The valve body 11 is in a closed state), the coupling ring 6 is connected and oil is supplied from the tank truck 31.

When the valve chamber 10 is filled with kerosene, the float device 30 floats to the position shown in FIG. 2 together with the float shaft 26, since the specific gravity of the float device 30 is set smaller than that of kerosene as described above. As a result, the rotation of the pawl 23 by the lower end 29 of the float shaft 26, that is, the prevention of rotation of the valve body 11 in the valve opening direction is released.

Next, when the lever 13 is rotated to the solid line position in FIG. Then, the lever 13 is rotated counterclockwise, and the lever 13 is fitted into the recess 21 and locked. That is, the valve body 11 opens and the oil from the tank truck 31 is injected into the tank 8.

The oil in the tank truck 31 is emptied, and the valve chamber 1
When the oil in the valve 0 is also empty, the float device 30 descends to the position shown in FIG. 1 (at this time, the valve body 11 remains open).

After that, when the lock release protrusion 22 of the lock valve 15 is pushed, the lock piece 15 is displaced and rotated about the pin 16 against the bias of the spring 18, and the recess 21
The locking of the lever 13 by the lever 13 is released, that is, the lever 13 is returned to the position indicated by the chain double-dashed line in FIG. 3 due to the weight of the valve body 11 and the lever 13, and the valve body 11 is closed.

When the valve body 11 closes, the flow device 30 is lifted by the claw 23 and then lowered again to the state shown in FIG. 1.

Finally, the lubrication work is completed when the coupling 6 is removed from the upper end opening 3 and the cap 4 is applied in its place. However, at this time, even if you forget to release the locking of the lever 13 by the locking piece 15 and try to remove the coupling 6, , the upper end of the lever 13 is close to the position of the coupling ring 6, so if it remains as it is, the coupling ring 6
It is difficult to remove, and it is easy to realize that you have forgotten to operate it.

Next, regarding the case where you try to inject gasoline by mistake, even if the valve chamber 10 is filled with gasoline, the float device 30 will not float up because its specific gravity is set higher than that of gasoline. The pawl 23 remains blocked from rotating by the lower end 29 of the float shaft 26, so even if you try to turn the lever 13 counterclockwise in FIG. There is no risk that gasoline will be injected into No.8.

As detailed above, since the opening/closing operation of the valve body is restricted by a float device with a specific gravity between that of gasoline and kerosene, there is no risk of gasoline being accidentally mixed into kerosene. Since the tip of the lever is set to be in a position that obstructs the removal operation of the coupling ring when the valve is opened, a safe valve device with a simple structure can be obtained, which eliminates the risk of removing the coupling ring and completing lubrication while the valve is in the open state. It is something that can be done.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sections of the valve device, showing different operating states. Figure 3 shows the outer shape of the valve device including the lever, Figure 4 is a plan view of Figure 3, and Figure 5 is a cross-section of the valve device. Similarly, FIG. 3 shows a cross section taken along the Y-Y direction, and FIG. 6 shows a state in which oil is supplied from a tank truck to an underground tank. DESCRIPTION OF SYMBOLS 1... Valve device, 2... Housing, 4... Cap, 6... Coupling, 11... Valve body, 13
... lever, 14 ... locking mechanism, 30 ... float device.

Claims (1)

[Claims] 1. A valve chamber is formed in a housing connected to a conduit through which liquid A with a relatively large specific gravity should flow and a conduit through which liquid B with a relatively low specific gravity may flow, and a valve body is inserted into this valve chamber. This valve body can be opened and closed from the outside of the housing.
On the other hand, a float is arranged in relation to the valve body so as to be able to prevent it from opening, and the specific gravity of this float is set to be smaller than the liquid A and larger than the liquid B, so that the prevention of the opening movement of the valve body is released by the floating of the float. The configured valve device.