JPH01266373A - Automatic gate valve for liquid suction system - Google Patents

Abstract

PURPOSE:To improve transfer efficiency, in an automatic valve for transferring such as oil from such as a tanker to a tank, by providing automatic opening/ closing function together with liquid/gas separating function through a float valve thereby eliminating stop operation of pump and air ventilating operation. CONSTITUTION:An inlet 17 and an outlet 18 are provided to a casing 10. The inlet 17 is coupled with a tank while the outlet 18 is coupled with the suction side of a transfer pump. Furthermore, a flow-out valve hole 11 is made between the lower section of a valve chamber 16 in the casing 10 and the outlet 18 while an exhaust valve hole 12 is made in the upper section of the valve chamber. A float valve body 13 for closing the flow-out valve hole 11 or the exhaust valve hole 12 corresponding to the liquid level is contained in the valve chamber 16.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is mainly applicable to cases where liquid is sucked into a large tank from a small tank, for example, a tank truck, and stored therein.
This invention relates to an automatic opening/closing valve that is installed in a pipe that transfers the liquid, operates automatically when suction is started from a small tank, and when the small tank becomes empty, and has an opening/closing function and a gas-liquid separation function.

<Prior art> Conventionally, when transferring oil from a tanker truck to a large storage tank, etc., as shown in Fig. 2, a connection pipe 2, a manual open/close valve 3, a connecting pipe 2, a manual open/close valve 3, a collecting pipe 4 are connected from the tank 1 of the tanker truck to a collecting pipe 4. ．． The liquid is transferred to a large tank 7 via a liquid feeding pump 6 equipped with a pressure gauge 5 on the suction side. In this device, oil can be simultaneously transferred from a plurality of tanks 1 to one large tank 7 by the suction action of the pump 6. The operating procedure is to connect the connecting pipe 2 to the tank l, open the on-off valve 3, and operate the pump 6. At this time, if air is mixed in the pipe line, the pump 6
Air is bleed by operating the air bleed valve 6a of the tank 1. When either of the tanks 1 becomes empty, air is sucked in, and the vacuum on the suction side of the pump 6 is broken and the pressure approaches atmospheric pressure. This is detected by the pressure gauge 5, the pump 6' is stopped, and the on-off valve 3 is closed. In that case, if oil is being sucked from multiple tanks 1 at the same time, it will not be possible to detect which tank 1 is empty, but in reality the amount of oil stored in tank 1 and the time required for transfer will be taken into consideration. Then, the operator apparently decided to perform an air bleed operation on the 0th order and restart suction.

<Problems to be Solved by the Invention> In the conventional oil transfer device, there is a problem that the on-off valve 3 is a manual on-off valve, which requires time and effort, and furthermore, an air bleed operation is required every time one of the tanks 1 is empty. Another problem is that it requires a lot of time and effort. Since the pump 6 is stopped each time the air bleed operation is performed, the oil transfer becomes intermittent and the transfer efficiency decreases accordingly.

Instead of the manual on-off valve 3, it is possible to use an automatic valve that closes electrically based on detecting a pressure drop with the pressure gauge 5, but it is necessary to adopt an explosion-proof structure for oil transfer. Therefore, there is a problem that the device becomes expensive, and in a configuration that detects a drop in pressure on the suction side of the pump 6, air flows into the collecting pipe 4, so an air bleeding operation is necessary, and the pump The problem of intermittent operation is not resolved.

This invention automatically closes the liquid passage when the small tank in the suction pipe system of the liquid pump becomes empty to prevent air from being sucked into the pump, and prevents air from being drawn into the pump. An object of the present invention is to provide a mechanical automatic opening/closing valve that automatically exhausts air into the atmosphere and opens a liquid passage when a small tank is connected and oil transfer is resumed.

Means for Solving the Problems> The automatic opening/closing valve for a fluid suction system of the present invention has a valve chamber, an inlet communicating with the valve chamber and connected to a tank from which liquid is taken out, A casing having an outlet connected to the suction side of the liquid transfer pump, a flow valve hole provided between the lower part of the valve chamber and the outlet, and an exhaust valve hole provided between the upper part of the valve chamber and the outside. , which is housed in the valve chamber and descends when the liquid level of the valve chamber is in a state of collapse to close the outflow valve hole, and rises when the liquid level of the valve chamber is in a rising state to open the outflow valve hole and close the exhaust valve hole. It consists of a float valve body installed in the valve body.

Function: This automatic on-off valve is installed below the bottom of the tank to which the inlet is connected. When the pump is operating with liquid filling the line between the outlet and the pump,
Negative pressure is applied to the outlet side by the suction action of the pump. When there is no liquid in the valve chamber, the float valve element descends and the outflow valve hole is closed, so the air in the valve chamber does not flow to the outlet side.If a tank containing liquid is connected to the inlet side, Liquid flows in from the inlet. At this time, the air in the valve chamber and the pipe connected to the inlet is discharged from the open exhaust valve hole, and when the liquid level in the valve chamber rises, the lower outflow valve hole sinks below the liquid level, and the float valve The body floats up, the outflow valve hole opens, and only the liquid flows out to the outlet side. When most of the air in the valve chamber is exhausted, the float valve element reaches the upper part of the valve chamber and closes the exhaust hole. In this state, liquid is transferred.

When the tank from which the liquid is removed is empty, air finally flows into the valve chamber. As a result, the liquid level in the valve chamber falls, so the float valve body also falls, opening the exhaust valve hole and closing the outflow valve hole. Therefore, the air that has flowed into the valve chamber does not flow to the outlet side.If the connection on the inlet side is changed to a tank containing liquid, the transfer of liquid is resumed in the same manner as described above.

Embodiment In FIG. 1 which shows a first embodiment, lO is a casing, 11 is an outflow valve hole, 12 is an exhaust valve hole, and 13 is a float valve body.

The casing 10 has a substantially cylindrical container shape, consisting of a main body 14 and a lid 15, and has a valve chamber 16 inside.
can be connected to pipes. Further, an outlet 18 is provided on the opposite side of the inlet 17, and this outlet 18 is connected to the passage 1.
9 and an outflow valve hole 11 to communicate with the lower part of the valve chamber 16. Outlet 18 can be connected to a pipe.

The outflow valve hole 11 is provided between the lower part of the valve chamber 16 and the outlet 18, and a rubber valve seat 20 is provided on the valve chamber 16 side.

The exhaust valve hole 12 is provided in the lid 15, located above the valve chamber 16, and communicates the valve chamber 16 with the outside world. Exhaust valve hole 12
A rubber valve seat 21 is provided on the valve chamber 16 side.

The float valve body 13 is a sphere that is sufficiently lighter than the liquid to be transferred, and can close the respective valve holes by contacting the valve seats 20 and 21 at any position on the outer surface. , 22 is a float valve body holder, and the float valve body 13 is
When the float valve body 13 descends, it comes into contact with the center of gravity of the float valve body 13 and the center of the outflow valve hole 11. This increases the valve opening force. Also, 23 is a float valve body abutting part, and when the float valve body 13 floats and rises, it abuts and regulates it to sit well on the valve seat 20 of the exhaust valve hole. It is something.

The automatic on-off valve 24 configured as described above is used in place of the manual on-off valve 3 in the liquid transfer device shown in FIG. That is, the inlet is connected to the tank 1 side and the outlet is connected to the pump 6 side. From a state where there is oil in each tank l and pump 6 is operating.

When one of the plurality of tanks 1 becomes empty, air flows into the automatic opening/closing valve 24 connected to the tank 1 through the inlet 17, and the liquid level in the valve chamber 16 falls. As a result, the float valve body 13, which had floated up to close the exhaust valve hole 12, descends, opens the exhaust valve hole 12, and closes the outflow valve hole 11, which had been open until then. Therefore, the air that has flowed in will not flow out from the outflow valve hole 11, and no air will enter into the collecting pipe 4. This causes pump 6 to continue transferring oil from other tanks 1 to tank 7. empty tank l
When the connecting pipe 2 is disconnected from the tank l and another tank l containing oil is connected, the air in the connecting pipe 2 and the valve chamber 16 of the automatic on-off valve 24 is discharged from the open exhaust valve hole 12, and the oil is removed. It flows into the valve chamber 16. Since the liquid level in the valve chamber 16 rises as air is discharged, the float valve body 13 floats up, the flow valve hole 11 opens, and only oil flows out into the collecting pipe 4. The floating valve body 13 closes the exhaust valve hole 12 when most of the air in the valve chamber 16 is exhausted.
Prevent oil from leaking out.

In the embodiment described above, an example of use was shown in which oil is transferred from a plurality of tanks 1 to a tank 7 using one pump 6, but it can also be used when there is only one tank 1.

In the embodiment described above, when oil is transferred from a plurality of tanks 1 to a tank 7 by one pump 6, one tank 1 is used.
The pressure gauge 5 can hardly detect that the tank 1 has become empty, and it is also unclear which tank 1 has become empty. This becomes a problem if the tank l does not have such equipment, such as a liquid level needle. To solve this problem, the casing 10 of the embodiment described above may be made transparent, a see-through window may be provided, or a transparent liquid level needle with equal pressure may be provided.In short, the liquid level within the valve chamber 16 may be All you have to do is make it possible to observe.

In addition, when there is only one tank 1, by using the pressure gauge 5, it is possible to detect that the tank 1 is empty due to a decrease in the pressure.

<Effects of the Invention> When a pump is used to transfer oil, etc. from a tank to another tank, the automatic opening/closing valve of the present invention can be used in the suction system of the pump to transfer oil, etc. from the tank from which the oil, etc. is taken out. Automatic opening/closing function that automatically and purely mechanically closes the passage when the tank is empty, and then automatically and purely mechanically opens the passage when another tank containing oil, etc. is connected. Since it has a gas-liquid separation function that separates and exhausts the air in the valve chamber when opening and closing, and prevents air from flowing into the pump side, there is no need to frequently stop the pump and bleed air as with conventional valves. Therefore, it is possible to improve the liquid transfer efficiency and to greatly reduce the amount of work required.

In addition, since this automatic opening/closing valve is purely mechanical, it does not require an explosion-proof structure like those that use electrical signals even when used to transfer flammable liquids. Since there is no need to specially install a detector, signal transmission line, drive power supply, or opening/closing drive device,
The effect of being able to provide the product at a low price can also be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of a conventional liquid transfer device. 1... Tank from which liquid is taken out, 2... Connection pipe, 6
... pump, 10 ... casing, 11 ... outflow valve hole, 12 ... exhaust valve hole, 13 ... float valve body,
16... Valve chamber, 17... Inlet, 18... Outlet, 1
9...Aisle. Patent applicant Chiinirbu Co., Ltd. Agent
Tetsu Shimizu and 2 other famous sweets 10% 2 illustrations

Claims (2)

[Claims] (1) A casing having a valve chamber, an inlet communicating with the valve chamber and connected to a tank from which liquid is taken out, and an outlet connected to the suction side of the liquid transfer pump; an outflow valve hole provided between the lower part of the valve chamber and the outlet; an exhaust valve hole provided between the upper part of the valve chamber and the outside; An automatic opening/closing valve for a liquid suction system, comprising a float valve body provided to close the outflow valve hole when the liquid level rises in the valve chamber, open the outflow valve hole, and close the exhaust valve hole by rising when the liquid level in the valve chamber rises. (2) The automatic on-off valve for a liquid suction system according to claim (1), characterized in that the liquid level in the valve chamber can be observed.