JP3336271B2 - Degassing valve and liquid transfer equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deaeration valve and a liquid transfer apparatus suitable for use in a waste liquid recovery apparatus configured to transfer, for example, a waste liquid generated in a plant from a collecting tank to a final tank by a siphon. Things.

[0002]

2. Description of the Related Art In a petrochemical plant, for example, waste liquid that cannot be discharged directly to the outside of the plant area, such as oil or chemicals discharged outside the process flow path or rainwater mixed with oil, is collected. After being collected by the equipment (liquid transfer equipment), it is sent to the final disposal plant.

As one mode of the waste liquid collecting equipment, there is a structure in which collecting tanks are provided at various points in a plant area, and the waste liquid flowing into the collecting tank is sent to a final tank through a slope pipe buried underground. However, such equipment requires a total length of several kilometers of piping, as well as the collecting tank and the final tank, which must be buried underground, which requires a great deal of time and effort in the design and construction process. .

[0004] As means for solving such inconveniences,
The collection tank and the final tank are connected to each other by a transfer pipe installed above the specified liquid level to form a siphon, and waste liquid recovery equipment is configured to send waste liquid from the collection tank to the final tank via the transfer pipe by siphon action. It is possible to do.

In the waste liquid recovery equipment having the above-described structure,
Since most of the equipment elements such as transfer pipes can be ground structures, the design and construction process can be shortened or omitted, shortening the construction period related to plant construction and greatly reducing equipment costs. Becomes

[0006]

By the way, in the waste liquid recovery equipment comprising a siphon as described above, when the waste liquid is stopped inside the transfer pipe, the waste liquid is heated by the solar heat to evaporate and is transferred. The generation of vapor bubbles inside the pipe may cause a siphon break, that is, a phenomenon in which the siphon state is broken.

Therefore, as shown in FIG. 9, a liquid supply tank E is connected via a pipe D to a transfer pipe C connecting the collecting tank A and the final tank B.
And a configuration in which a degassing valve F is provided in a pipe D is provided. According to the above configuration, when steam bubbles are generated inside the transfer pipe C, the steam rises up the pipe D from the transfer pipe C, enters the deaeration valve F, and enters the inside. Is lowered to the outside through the degassing valve F to the liquid supply tank E and released to the atmosphere. On the other hand, the replenishing liquid from the liquid supply tank E flows into the degassing valve F, and the float F
When a rises, it returns to the original closed state.

As described above, even when bubbles of steam are generated inside the transfer pipe C, the steam is discharged from the transfer pipe C to the atmosphere through the degassing valve F based on the operation of the degassing valve F. Therefore, it is possible to prevent a siphon break from occurring.

However, since the float Fa of the degassing valve F is a simple spherical float that is housed and floated inside, its operation is unstable, and the reliability of the opening / closing operation is reduced. There was an inconvenience.

The present invention has been made in view of the above circumstances, and has as its object to provide a deaeration valve capable of preventing a siphon break from occurring by a reliable opening and closing operation.

On the other hand, in a waste liquid recovery facility comprising a siphon, at the time of start-up, an empty transfer pipe is filled with waste liquid by a pressure reducing device (vacuum pump, ejector, etc.) to form a siphon. The siphon state is restored by operating the pressure reducing device even when the liquid level in the final tank is abnormally lowered and outside air enters through the end opening of the transfer pipe to cause a siphon break.

As described above, in the conventional waste liquid recovery equipment, since the decompression device is used for forming and restoring the siphon, not only the structure of the equipment is complicated and the cost is increased, but also when the siphon is formed. Upon recovery,
There has been a problem that the operator has to perform complicated operations related to the operation of the pressure reducing device.

In view of the above situation, the present invention can prevent the occurrence of siphon break by the reliable opening and closing operation of the deaeration valve as much as possible, without complicating the structure and increasing the cost. Further, it is an object of the present invention to provide a liquid transfer facility capable of forming and restoring a siphon without requiring complicated operations by an operator.

[0014]

In order to achieve the above object, a deaeration valve according to the present invention has a housing having an upper part communicating with a liquid supply tank and a lower part communicating with a transfer pipe.
The transfer pipe and the liquid supply tank are settled at the bottom dead center when the liquid is filled inside, and the transfer pipe and the liquid supply tank are accommodated in the housing so as to be vertically movable and have an opening for introducing gas from the transfer pipe at the bottom. And a float valve that moves upward from bottom dead center to top dead center due to gas-liquid balance in a state where gas is introduced into the inside, and further provided on the float valve, When the float valve reaches the top dead center,
It is characterized by comprising an opening / closing valve which is opened by the buoyancy of the gas in the float valve, discharges the gas in the float valve to the liquid supply tank, and introduces a replenishing liquid from the liquid supply tank into the float valve. And

Further, in order to achieve the above object, the liquid transfer equipment according to the present invention comprises a siphon in which a collecting tank and a final tank communicate with each other by a transfer pipe, and is provided in an upper region of the transfer pipe for replenishment. A liquid supply tank that stores liquid is connected to the top of the transfer pipe via a pipe, and further prevents communication between the transfer pipe and the liquid supply tank in a normal state, and in a situation where gas exists inside the transfer pipe. A degassing valve that permits the release of gas from the transfer pipe to the liquid supply tank and the inflow of the replenisher from the liquid supply tank to the transfer pipe is interposed in the pipe connecting the transfer pipe and the liquid supply tank, In addition, a gate valve is provided in a pipe connecting the deaeration valve and the transfer pipe. The deaeration valve interposed in the pipe connecting the transfer pipe and the liquid supply tank has a housing in which the upper part is connected to the liquid supply tank and the lower part is connected to the transfer pipe, and is vertically movable within the housing. It has an opening for introducing gas from the transfer pipe at the bottom, and in the state where the liquid is filled inside, it sinks to the bottom dead center and prevents communication between the transfer pipe and the liquid supply tank, A float valve that moves upward from bottom dead center to top dead center due to gas-liquid balance in a state in which gas is introduced therein, and is further provided on the float valve, and the float valve is located at top dead center. An opening / closing valve that is opened by the buoyancy of the gas in the float valve in the reached state, discharges the gas in the float valve to the liquid supply tank, and introduces a replenishing liquid from the liquid supply tank into the float valve. ing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 and FIG.
1 shows an example in which a degassing valve and a liquid transfer facility according to the present invention are applied to a waste liquid recovery facility in a petrochemical plant. As is clear from FIGS. 1 and 2, the waste liquid recovery facility 1 includes a plurality of collecting tanks 2. And one final tank 3 and a transfer pipe 4 for communicating these.

A plurality of collecting tanks 2, 2... Are respectively installed at various parts of the plant area.
, Waste fluids such as oil and chemicals flowing into the water collecting port H are sent through the introduction pipe I.

On the other hand, the final tank 3 includes an introduction tank 3A into which the waste liquid is sent from the transfer pipe 4, and a storage tank 3B for storing the waste liquid overflowing the introduction tank 3A. A drainage pump P for sending waste liquid to a terminal treatment plant (not shown) is provided.

The final tank 3 is provided with sensors Sh and Sl for detecting the position of the liquid level in the storage tank 3B. The drain pump P operates when the sensor Sh detects the liquid level. Is started, and the operation is controlled in such a manner that the operation is stopped when the sensor Sl detects the liquid level, the liquid level in the storage tank 3B is lower than the introduction tank 3A, and Operate to maintain high state.

On the other hand, the transfer pipes 4 are installed above the specified liquid levels of the collecting tank 2 and the final tank 3, and the intake side thereof corresponds to the number of collecting tanks 2, 2,... As shown in FIG. The ends of the branched and branched intake side ends 4i, 4i,... Are respectively installed facing the insides of the collecting tanks 2, 2,. It is installed facing the inside of the introduction tank 3A.

A liquid supply tank 6 disposed above the transfer pipe 4 is connected to a central horizontal portion 4v of the transfer pipe 4, that is, the uppermost part of the transfer pipe 4 via a pipe 5 extending upward. I have.

A replenishing liquid W is supplied to the liquid supply tank 6 through a supply pipe J, and a predetermined amount of the replenishing liquid W is always stored by the action of a float valve Jv provided in the supply pipe J. Have been. The replenishing liquid W supplied to the liquid supply tank 6 is basically a liquid of the same quality as the waste liquid transferred through the transfer pipe 4.

A pipe 5 for connecting the transfer pipe 4 and the liquid supply tank 6 is provided with a deaeration valve 10 according to the present invention. When the gas is generated inside the transfer pipe 4 while the communication between the transfer pipe 4 and the liquid supply tank 6 is prevented, the gas is discharged from the transfer pipe 4 to the liquid supply tank 6 and the gas is discharged from the liquid supply tank 6 to the transfer pipe 4. It operates in a mode that allows the inflow of the replenishing liquid W.

Since the limit of the height at which a siphon can be formed is usually about 10 m, the above-mentioned waste liquid recovery equipment 1
, The height from the bottom surface of the collecting tank 2 to the upper surface of the deaeration valve 10 is set to 10 m or less.

A pipe 5 for connecting the deaeration valve 10 and the liquid supply tank 6
a, a liquid supply tank side gate valve 7A manually operated by an operator is provided, and a deaeration valve 10 and a transfer pipe 4 are provided.
Is provided with a deaeration valve-side gate valve 7B that is manually operated by an operator.

Further, the pipe 5 is provided with an atmosphere release pipe 5c communicating with a pipe 5a connecting the degassing valve 10 and the liquid supply tank 6 and extending upward from the degassing valve 10. The upper opening of the release pipe 5c is set at a position higher than the level of the replenishing liquid W stored in the liquid supply tank 6.

Since the above-mentioned atmosphere release pipe 5c extends straight upward from the degassing valve 10, most of the gas passing through the degassing valve 10 from the transfer pipe 4 goes to the liquid supply tank 6. Instead, the gas is smoothly discharged to the atmosphere via the atmosphere release pipe 5c.

Here, as shown in FIGS. 2 to 4, a deaeration valve 10 interposed in the pipe 5 includes a housing 11, a float valve 12 housed in the housing 11, and a float valve 12. And an on-off valve 13 provided.

The housing 11 has a cylindrical shape whose upper and lower parts are closed. The upper part is connected to the liquid supply tank 6 via a pipe 5a, and the lower part is connected to the transfer pipe 4 via a pipe 5b. A ring-shaped packing 11p is attached to 11b.

On the other hand, the float valve 12 has a cylindrical body 12a.
Upper guide plate 12t and lower guide plate 12
b at the center of the lower guide plate 12b, an opening 12o communicating the inside and outside of the float valve 12.
Are formed.

As shown in FIG. 4A, a plurality of ribs 12t 'are formed on the outer periphery of the upper guide plate 12t, and as shown in FIG. A plurality of ribs 12b 'are formed on the outer periphery.

The float valve 12 has a lower dead center (see FIG. 5) where the lower guide plate 12b abuts on the bottom wall 11b of the housing 11 via the packing 11p, and an upper guide plate 12t which is a top wall of the housing 11. It is accommodated in a vertically movable manner with respect to the top dead center (see FIG. 8) abutting on 11t.

A valve body 13a communicating with the inside of the float valve 12 is formed in the upper guide plate 12t of the float valve 12, and a communication hole 13h is formed in a peripheral wall of the valve body 13a.

A valve body 13b is accommodated inside the valve body 13a so as to be vertically movable between a closed position shown by a solid line and an open position shown by a chain line. The on-off valve 13 is constituted by the provided valve body 13a and the valve element 13b housed in the valve body 13a.

In the waste liquid recovery equipment 1 having the above configuration,
During its operation, the transfer pipe 4, the pipe 5, and the deaeration valve 10
It is in a state of being filled with liquid (waste liquid and replenishing liquid), whereby a siphon is formed between the collecting tank 2 and the final tank 3.

The liquid supply tank side gate valve 7A and the deaeration valve side gate valve 7B are both opened, and the liquid supply tank 6 and the deaeration valve 1 are opened.
0 and between the deaeration valve 10 and the transfer pipe 4 are communicated with each other.

Here, in the deaeration valve 10 having the above configuration,
In the normal state as shown in FIG. 5, since the liquid is also filled inside the float valve 12, the weight of the float valve 12 and the liquid load in the float valve 12, the differential pressure between the liquid supply tank 6 and the transfer pipe 4, and the like. As a result, the float valve 12 sinks and is located at the bottom dead center.

When the float valve 12 is located at the bottom dead center, the valve 13b of the on-off valve 13 occupies the closed position due to its own weight and the pressure difference between the liquid supply tank 6 and the transfer pipe 4. As a result, the deaeration valve 10 completely shuts off the communication between the transfer pipe 4 and the liquid supply tank 6.

As described above, in the state where the siphon is formed, the waste liquid L flows into the collecting tank 2 from the water collecting port H via the introduction pipe I, and the liquid level of the waste liquid L in the collecting tank 2 is changed to the final tank 3. Level of waste liquid L in introduction tank 3A
When the liquid level rises above the specified level, the waste liquid L is transferred from the collecting tank 2 to the introduction tank 3A of the final tank 3 via the transfer pipe 4 by siphon action, and overflows from the introduction tank 3A and flows into the storage tank 3B. L is sent out to a final treatment plant (not shown) by the drainage pump P.

Here, when the liquid level of the waste liquid L flowing into the storage tank 3B rises above the introduction tank 3A, the waste liquid recovery equipment 1
Although the entire system may overflow, as described above, the liquid level of the waste liquid L in the storage tank 3B is always increased by the drain pump P whose operation is controlled by the information of the sensors Sh and Sl. It is kept lower than 3A.

As described above, the state in which the liquid level in the introduction tank 3A is maintained and the state in which the waste liquid L is always filled in the transfer pipe 4, that is, the siphon state, are maintained. Transfer of the waste liquid to the tank 3 is performed stably.

Incidentally, the introduction tank 3 of the collecting tank 2 and the final tank 3
In a state in which the liquid level of the liquid A and the waste liquid L is stopped inside the transfer pipe 4, the waste liquid L is heated by solar heat and evaporates, and the gas (vapor bubbles) is generated inside the transfer pipe 4.
When this occurs, this gas rises from the transfer pipe 4 to the pipe 5b, and is introduced into the float valve 12 of the deaeration valve 10 through the opening 12o of the float valve 12, as shown in FIG.

As the gas accumulates and the density in the float valve 12 decreases, the buoyancy acting on the float valve 12 becomes
When the weight of the float valve 12 and the pressure difference between the liquid supply tank 6 and the transfer pipe 4 are exceeded, the float valve 12 floats as shown in FIG.

Float valve 1 rising inside housing 11
As shown in FIG. 8, when the valve 2 reaches the top dead center by contacting the top wall 11t of the housing 11, the buoyancy of the gas in the float valve 12 pushes the valve body 13b of the on-off valve 13 to the open position. Thus, it communicates with the inside of the float valve 12 through the communication hole 13h.

As a result, the gas in the float valve 12 is instantaneously released through the communication hole 13h, and the replenishing liquid W in the float valve 12 has an amount corresponding to the amount of gas released from the liquid supply tank 6. It will flow in and be filled.

Here, a part of the gas released from the float valve 12 flows from the pipe 5a to the liquid supply tank 6, and is discharged to the atmosphere via the replenishing liquid W stored in the liquid supply tank 6. However, most of the gas released from the float valve 12 is smoothly released to the atmosphere via the atmosphere release pipe 5c of the pipe 5.

On the other hand, the float valve 12 filled with makeup water
3 quickly sinks to the bottom dead center due to its own weight and the internal liquid load, returns to the normal state as shown in FIG. 3, and cuts off the communication between the transfer pipe 4 and the liquid supply tank 6. At this time, a small space may remain in the upper part of the float valve 12 in some cases.

As described above, even when gas is generated inside the transfer pipe 4, the gas is discharged from the transfer pipe 4 to the atmosphere via the deaeration valve 10 based on the operation of the deaeration valve 10.
The occurrence of a siphon break is prevented beforehand.

The above-mentioned deaeration valve 10 has a more stable operation compared to a conventional deaeration valve which employs a simple spherical float, so that the reliability of the opening and closing operation is improved. Thus, according to the waste liquid recovery equipment 1 having the above-described configuration, it is possible to prevent the occurrence of the siphon break by the reliable operation of the deaeration valve 10.

On the other hand, in the waste liquid recovery equipment 1 having the above-described configuration, at the time of startup, the collecting tank 2, the final tank 3, the transfer pipe 4 and the deaeration valve 10 are completely emptied, and the transfer pipe 4 is removed.
To form a siphon by filling the liquid with the following procedure.

First, the deaeration valve side gate valve 7B is closed, and the communication between the deaeration valve 10 and the transfer pipe 4 is interrupted. Then, the liquid supply tank side gate valve 7A is opened, and the liquid supply tank 6 is opened. And the deaeration valve 10 are communicated with each other to supply and fill the inside of the deaeration valve 10 from the liquid supply tank 6.

Next, the deaeration valve side gate valve 7B is opened,
The deaeration valve 10 and the transfer pipe 4 are communicated with each other.
Is made to flow into the collecting tank 2 and the final tank 3 via the transfer pipe 4.

The liquid level of the collecting tank 2 and the final tank 3 is adjusted by the tip of the intake side end 4 i and the drainage end 4 of the transfer pipe 4.
When the space inside the transfer pipe 4 reaches the front end of o and the space inside the transfer pipe 4 is sealed, and the replenishing liquid W from the liquid supply tank 6 flows into the deaeration valve 10 and is filled, first, FIGS. The operation of the deaeration valve 10 as described with reference to FIG.
Are replaced with each other.

That is, the floating and sinking of the float valve 12 and the opening and closing of the on-off valve 13 as shown in FIGS.
While the deaeration valve 10 intermittently blocks communication between the liquid supply tank 6 and the transfer pipe 4, the air in the transfer pipe 4 is released to the atmosphere, and the replenishing liquid W in the liquid supply tank 6 is transferred to the transfer pipe 4. , The liquid is finally filled in the transfer pipe 4, thereby forming a siphon.

As described above, according to the waste liquid recovery equipment 1 having the above-described configuration, a siphon can be formed at the time of start-up by simply opening and closing the gate valve.

Further, in the conventional waste liquid recovery equipment, it is necessary to install a decompression device for startup, whereas in the waste liquid recovery equipment 1 of the present invention described above, the decompression device is not required. A siphon can be formed at startup.

That is, in the above-mentioned waste liquid recovery equipment 1,
With the installation of the decompression device, without complicating the structure and increasing the cost, and without complicated operations by the operator,
A siphon can be formed at startup.

At the time of the above-mentioned start-up, when the deaeration valve-side gate valve 7B is opened and the liquid flows from the deaeration valve 10 into the collecting tank 2 and the final tank 3, the liquid level is increased by one operation. It is needless to say that the supply and discharge of the replenishing liquid W in the deaeration valve 10 need to be repeated several times when the end does not reach the end of the transfer pipe 4.

In order to form a siphon reliably and promptly, the collecting tank 2 and the final tank 3 are filled with liquid in advance.
It is preferable to seal the end of the transfer pipe 4 with a liquid.

By the way, when gas is generated inside the transfer pipe 4 in a state where the siphon is formed as described above and the waste liquid recovery equipment 1 is operating, as described in detail above, the deaeration valve 10 is used. Since the gas is released from the transfer pipe 4 to the atmosphere via the deaeration valve 10 based on the operation described above, the siphon break is prevented beforehand.

On the other hand, even if a large siphon break occurs and a large amount of liquid flows out of the transfer pipe 4,
The opening at the end of the transfer pipe 4 corresponds to the collecting tank 2 and the final tank 3.
The air in the transfer pipe 4 and the replenishing liquid W in the supply tank 6 are replaced with each other by the operation of the deaeration valve 10 as described above, By filling the inside, the siphon can be restored without any operation by the operator.

When the liquid completely flows out of the transfer pipe 4 and a siphon break reaches the deaeration valve 10,
By performing the same operation as at the time of startup described above, the siphon can be reliably restored.

As described above, in the waste liquid recovery facility 1 having the above-described configuration, the occurrence of a siphon break can be prevented as much as possible, and even if a siphon break occurs, complicated operations by the operator can be performed. Since the siphon can be surely restored without the necessity, it is possible to stably transfer the waste liquid over a long period of time, for example, one year to two years.

Further, according to the waste liquid recovery equipment 1 having the above-described configuration, the siphon can be restored without the need for a decompression device, so that the installation of the decompression device complicates the structure, increases the cost, and further increases the cost of the operator. The siphon can be restored without complicated work.

In the above-mentioned waste liquid recovery equipment 1, a plurality of collecting tanks 2 and one final tank 3 are installed. The number of these collecting tanks and final tanks to be installed is set arbitrarily according to the scale of the equipment. It goes without saying that it can be done.

In the waste liquid recovery equipment 1 described above, one deaeration valve 10 is provided for the transfer pipe 4, but the number of deaeration valves can also be arbitrarily set according to the scale of the equipment. Of course.

Further, in the above-described embodiment, an example in which the present invention is applied to a waste liquid collecting facility of a petrochemical plant is shown. It can be applied very effectively as a raw material supply line or a product line in various plants handling liquid raw materials or liquid products, such as plants and pharmaceutical plants.

The liquid transfer equipment according to the present invention may be used as a liquid level adjusting equipment or a liquid transfer equipment in a water storage / tank equipment such as a reservoir or a regulating pond, and further as a liquid transfer equipment in an irrigation equipment, a water supply equipment, a water sprinkling equipment or the like. Can be applied very effectively.

[0069]

As described in detail above, the deaeration valve according to the present invention has a housing having an upper part communicating with the liquid supply tank and a lower part communicating with the transfer pipe, and a vertically movable housing inside the housing. In the state where the bottom is provided with an opening for introducing gas from the transfer pipe and the inside is full of liquid,
A float valve that sinks to the bottom dead center, prevents communication between the transfer pipe and the liquid supply tank, and moves upward from the bottom dead center to the top dead center due to gas-liquid balance when gas is introduced inside. Provided, further provided in the float valve, in the state where the float valve has reached the top dead center, is opened by the buoyancy of the gas in the float valve, discharge the gas in the float valve to the liquid supply tank, Further, an on-off valve for introducing a replenishing liquid from the liquid supply tank into the float valve is provided.

According to the above configuration, the operation becomes more stable than the conventional deaeration valve which employs a simple spherical float, so that the reliability of the opening / closing operation is improved. According to the deaeration valve relating to the above, it is possible to prevent the occurrence of a siphon break by a reliable opening / closing operation.

Further, the liquid transfer equipment according to the present invention is a liquid supply tank which forms a siphon by connecting a collecting tank and a final tank by a transfer pipe, and is provided above the transfer pipe to store a replenishing liquid. Is connected to the top of the transfer pipe via a pipe,
Further, in the normal state, while preventing communication between the transfer pipe and the liquid supply tank, and in a situation where gas exists inside the transfer pipe,
A deaeration valve that permits release of gas from the transfer pipe to the liquid supply tank and inflow of the replenisher from the liquid supply tank to the transfer pipe is interposed in the pipe connecting the transfer pipe and the liquid supply tank, and A gate valve is provided in a pipe connecting the deaeration valve and the transfer pipe.

The deaeration valve interposed in the pipe connecting the transfer pipe and the liquid supply tank has a housing having an upper part connected to the liquid supply tank and a lower part connected to the transfer pipe, and a housing having the lower part connected to the transfer pipe. It is housed vertically and has an opening at the bottom for introducing gas from the transfer pipe, and when it is filled with liquid, it sinks to the bottom dead center and communicates with the transfer pipe and the liquid supply tank. And a float valve that moves upward from bottom dead center to top dead center due to gas-liquid balance in a state where gas is introduced into the inside. An on-off valve that opens by the buoyancy of the gas in the float valve when the dead center is reached, discharges the gas in the float valve to the liquid supply tank, and introduces a replenisher from the liquid supply tank into the float valve. Is provided.

According to the above configuration, the deaeration valve having the above configuration has a more stable operation than the conventional deaeration valve that employs a simple spherical float. Thus, in the liquid transfer facility according to the present invention, the occurrence of a siphon break can be prevented by the reliable opening / closing operation of the deaeration valve.

Further, according to the above configuration, the siphon can be formed by filling the transfer pipe with the liquid at the time of start-up by opening and closing the gate valve provided in the pipe connecting the deaeration valve and the transfer pipe. .

Further, according to the above configuration, when a slight siphon break occurs, the siphon can be restored by operating the deaeration valve, and when a large siphon break occurs in which the transfer pipe becomes empty. However, the siphon can be restored by filling the transfer tube with liquid by opening and closing the gate valve, as at startup.

That is, in the above configuration, the formation and restoration of the siphon can be performed without requiring the power of the decompression device or the like, and without forcing the operator to perform complicated work related to the operation of the decompression device or the like.

Thus, according to the liquid transfer equipment according to the present invention, the occurrence of siphon break can be prevented as much as possible by the reliable opening / closing operation of the deaeration valve, and the installation of power such as a decompression device is caused. The siphon can be formed and restored without complicating the structure or increasing the cost, and without requiring complicated operations by the operator.

[Brief description of the drawings]

FIG. 1 is a bird's-eye view conceptually showing the overall configuration of a liquid transfer facility according to the present invention.

FIG. 2 is a conceptual diagram showing a configuration of a liquid transfer facility according to the present invention.

FIG. 3 is a conceptual cross-sectional side view showing a deaeration valve in the liquid transfer facility of the present invention.

4A and 4B are a sectional view taken along line aa and a line bb in FIG. 3;

FIG. 5 is an operation mode of a deaeration valve in the liquid transfer facility of the present invention.
FIG. 3 is a conceptual diagram showing (bottom dead center).

FIG. 6 is a conceptual diagram showing an operation mode of a deaeration valve in the liquid transfer facility of the present invention.

FIG. 7 is a conceptual diagram showing an operation mode of a deaeration valve in the liquid transfer facility of the present invention.

FIG. 8 shows an operation mode of a deaeration valve in the liquid transfer facility of the present invention.
The conceptual diagram which shows (top dead center).

FIG. 9 is a conceptual diagram showing a configuration of a liquid transfer facility (waste liquid recovery facility) employing a conventional degassing valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waste liquid recovery equipment, 2 ... Collecting tank, 3 ... Final tank, 4 ... Transfer pipe, 5 ... Piping, 5a ... Piping, 5b ... Piping, 5c ... Open air pipe, 6 ... Liquid supply tank, 7A ... Liquid supply tank Side gate valve, 7B: Deaeration valve Side gate valve, 10: Deaeration valve, 11: Housing, 12: Float valve, 12o: Opening, 13: Open / close valve.

Continuation of the front page (72) Inventor Yasuo Suzuki 2205 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki Prefecture JGC Corporation Technical Research Institute (56) References JP-A-9-262577 (JP, A) JP-A-59-201983 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 24/00 B01D 19/00 C02F 1/20

Claims (3)

(57) [Claims] 1. A situation in which a gas is present inside a transfer pipe while preventing communication between the transfer pipe and the liquid supply tank in a normal state by being interposed in a pipe connecting a transfer pipe and a liquid supply tank constituting a siphon. A degassing valve which permits the discharge of gas from the transfer pipe to the liquid supply tank and the inflow of the replenisher from the liquid supply tank to the transfer pipe, the upper part being connected to the liquid supply tank and the lower part being the transfer pipe And a housing that is vertically movable within the housing, has an opening at the bottom for introducing gas from the transfer pipe, and settles to the bottom dead center when the liquid is filled inside and transfers it. A float valve that prevents communication between the pipe and the liquid supply tank and moves upward from bottom dead center to top dead center due to gas-liquid balance in a state where gas is introduced into the float valve; Above flow when the robot reaches the top dead center An opening / closing valve which is opened by the buoyancy of the gas in the float valve, discharges the gas in the float valve to the liquid supply tank, and introduces a replenishing liquid from the liquid supply tank into the float valve. And deaeration valve. 2. A siphon is formed by communicating the collecting tank and the final tank with each other by a transfer pipe installed above a specified liquid level of the collecting tank and the final tank, and a siphon is formed from the collecting tank through the transfer pipe. Liquid transfer equipment configured to transfer liquid to the transfer pipe, the liquid supply tank being provided in an upper region of the transfer pipe, storing a replenishing liquid and connected to the top of the transfer pipe via a pipe, and a transfer pipe And a housing that is connected to the liquid supply tank and has an upper part that communicates with the liquid supply tank and a lower part that communicates with the transfer pipe. It has an opening for introducing gas, sinks to the bottom dead center when the liquid is filled inside, prevents communication between the transfer pipe and the liquid supply tank, and gas-liquid when the gas is introduced inside. Float moves from bottom dead center to top dead center due to the balance of When the float valve reaches the top dead center, the float valve is opened by the buoyancy of the gas in the float valve, and the gas in the float valve is discharged to the liquid supply tank and supplied to the float valve. An on-off valve for introducing the replenishing liquid from the liquid tank, preventing communication between the transfer pipe and the liquid supply tank in a normal state, and in a state where gas exists inside the transfer pipe, from the transfer pipe to the liquid supply tank. And a gate valve provided on a pipe connecting the degassing valve and the transfer pipe. Liquid transfer equipment characterized by the above-mentioned. 3. A pipe connecting the liquid supply tank and the deaeration valve,
3. The liquid transfer equipment according to claim 2, wherein an air release pipe is connected.