Switching valve control system and switching valve control method

Abstract

The invention relates to the technical field of oilfield exploitation, and particularly discloses a switching valve control system and a switching valve control method.The switching valve control system is used for controlling on-off of a first switching valve, and a fossil energy pipeline of the switching valve control system is used for circulating fossil energy; the input end of the second switch valve communicates with the fossil energy pipeline, the output end of the second switch valve communicates with the on-off actuator, and the on-off actuator is used for driving the first switch valve to switch the on-off state. When the first switch valve needs to be controlled to be switched to the connection state, the second switch valve is controlled to be communicated with the fossil energy pipeline and the on-off actuator, so that the fossil energy part in the fossil energy pipeline flows to the on-off actuator through the second switch valve, and the on-off actuator is driven by the pressure of fossil energy to drive the first switch valve to be switched to the on-off state. And time and labor are saved, the operation safety is high, the situation that the first switch valve lacks an external power source in simple environment areas such as the field can be effectively overcome, and extra energy consumption can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to a valve control system and valve control method. Background Technology

[0002] In oilfield production systems, on / off valves are among the most commonly used valves on pipelines. However, operating these valves is inconvenient in situations where the fluid pressure inside the pipeline is extremely high or extremely low.

[0003] Currently, there are generally two solutions to this problem in related technologies. One is to operate the switching valve manually. However, due to the pressure of the fluid in the pipeline, manual operation is difficult and not conducive to safe production. The other is to use external electricity, hydraulics, gas, etc. as power sources to drive the switching valve to open and close. Although this can quickly and conveniently operate the switching valve, for oilfield development, the switching valves in the field and other rudimentary environments usually lack external power sources. Summary of the Invention

[0004] The purpose of this invention is to provide a switching valve control system and a switching valve control method to solve the above-mentioned problems existing in the related art.

[0005] A switching valve control system is used to control the on / off state of a first switching valve. The switching valve control system includes a fossil energy pipeline, a second switching valve, and an on / off actuator. The fossil energy pipeline is used to circulate fossil energy. The input end of the second switching valve is connected to the fossil energy pipeline, and the output end of the second switching valve is connected to the on / off actuator. The on / off actuator is used to drive the first switching valve to switch between on / off states.

[0006] As an optional solution for the above-mentioned switching valve control system, the switching valve control system further includes two two-position two-way pilot valves, the pilot ends of the two two-position two-way pilot valves are connected to the fossil energy pipeline, and the input ends of the two two-position two-way pilot valves are connected to the output end of the second switching valve.

[0007] The pilot pressure that drives one of the two-position two-way pilot valves to switch to the connected state is greater than or equal to the first limit pressure, and the pilot pressure that drives the other two-position two-way pilot valve to switch to the connected state is less than or equal to the second limit pressure, wherein the first limit pressure is greater than the second limit pressure; the pressure at which the on / off actuator drives the first switching valve to switch to the connected state is greater than the second limit pressure and less than the first limit pressure.

[0008] As an optional solution for the above-mentioned switching valve control system, the switching valve control system further includes a third switching valve, which is located at the input end of a two-position two-way pilot valve whose pilot pressure is less than or equal to the second limit pressure.

[0009] As an optional solution for the above-mentioned switching valve control system, the switching valve control system also includes a storage tank, and the output terminals of the two two-position two-way pilot valves are connected to the storage tank.

[0010] As an optional solution for the above-mentioned switching valve control system, the second switching valve is a one-way switching valve, which can unidirectionally connect the fossil energy pipeline and the on / off actuator, so that the fossil energy in the fossil energy pipeline flows to the on / off actuator.

[0011] As an optional solution for the aforementioned switching valve control system, the second switching valve is a manual one-way switching valve.

[0012] As an optional solution to the above-mentioned switching valve control system, the switching valve control system further includes a fourth switching valve, which is disposed on the pipeline connecting the fossil energy pipeline and the second switching valve. The fourth switching valve is a normally open switching valve, and the second switching valve is a normally closed switching valve.

[0013] As an optional solution for the aforementioned switching valve control system, the switching valve control system further includes a valve block, the valve block having a connecting flow channel, the connecting flow channel including a first connecting port, a second connecting port, a third connecting port and a fourth connecting port connected together, the first connecting port being connected to the fossil energy pipeline, the second connecting port being connected to the input end of the second switching valve, and the third connecting port and the fourth connecting port being connected one-to-one to the pilot ends of the two two-position two-way pilot valves.

[0014] A valve switching control method, implemented in the aforementioned valve switching control system, the valve switching control method comprising:

[0015] When a command is received to switch the first switching valve to the connected state, the second switching valve is controlled to connect the fossil energy pipeline and the on / off actuator; when a command is received to switch the first switching valve to the disconnected state, the second switching valve is controlled to disconnect the fossil energy pipeline and the on / off actuator.

[0016] As an alternative to the above-mentioned valve control method, the valve control system further includes a third valve and two two-position two-way pilot valves; the pilot ends of both two two-position two-way pilot valves are connected to the fossil energy pipeline, and the input ends of both two two-position two-way pilot valves are connected to the output end of the second valve; the pilot pressure for switching one of the two-position two-way pilot valves to the connected state is greater than or equal to a first limit pressure, and the pilot pressure for switching the other two-position two-way pilot valve to the connected state is less than or equal to a second limit pressure, wherein the first limit pressure is greater than the second limit pressure; the pressure at which the on / off actuator drives the first valve to the connected state is greater than the second limit pressure and less than the first limit pressure; the third valve is located at the input end of the two-position two-way pilot valve whose pilot pressure is less than or equal to the second limit pressure; the valve control method further includes:

[0017] When the second switching valve is controlled to connect the fossil energy pipeline and the on / off actuator, the third switching valve is simultaneously controlled to be in the off state; when the pressure of the fossil energy at the input end of the on / off actuator is greater than the second limit pressure, the third switching valve is controlled to be in the on state.

[0018] Beneficial effects:

[0019] This invention provides a switching valve control system and a switching valve control method. The switching valve control system controls the on / off state of a first switching valve. The system includes a fossil energy pipeline, a second switching valve, and an on / off actuator. The fossil energy pipeline circulates fossil energy. The input end of the second switching valve is connected to the fossil energy pipeline, and the output end of the second switching valve is connected to the on / off actuator. The on / off actuator drives the first switching valve to switch to the on / off state. When it is necessary to control the first switching valve to switch to the on state, the second switching valve is controlled to connect the fossil energy pipeline and the on / off actuator. This allows the fossil energy portion in the fossil energy pipeline to flow through the second switching valve to the on / off actuator. The pressure of the fossil energy itself drives the on / off actuator, which in turn drives the first switching valve to switch to the on state. This method is time-saving, labor-saving, and highly safe to operate. It effectively overcomes the situation where the first switching valve is located in a remote or other rudimentary environment lacking an external power source, and effectively avoids additional energy consumption. Attached Figure Description

[0020] Figure 1 A schematic diagram of a switching valve control system provided in an embodiment of the present invention.

[0021] In the picture:

[0022] 1. Fossil energy pipeline; 2. Second switching valve; 21. Operating button; 3. On / off actuator; 4. Two-position two-way pilot valve; 5. Third switching valve; 6. Storage tank; 7. Fourth switching valve; 8. Valve block; 81. Connecting flow channel. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In oilfield production systems, on / off valves are commonly used in pipelines. However, operating these valves becomes difficult in situations with extremely high or extremely low fluid pressure. Currently, there are generally two solutions to this problem: one is manual operation, but this is difficult and unsafe due to the pressure of the fluid; the other is using an external power source (electric, hydraulic, or pneumatic) to drive the valve. While this allows for quick and convenient operation, it is often unsuitable for oilfield operations in harsh environments such as the field.

[0028] This invention provides a switching valve control system for controlling the on / off state of a first switching valve, such as... Figure 1 As shown, the switching valve control system includes a fossil energy pipeline 1, a second switching valve 2, and an on / off actuator 3; the fossil energy pipeline 1 is used to circulate fossil energy; the input end of the second switching valve 2 is connected to the fossil energy pipeline 1, and the output end of the second switching valve 2 is connected to the on / off actuator 3, which is used to drive the first switching valve to switch on / off states.

[0029] When it is necessary to control the first switching valve to switch to the connected state, the second switching valve 2 is controlled to connect the fossil energy pipeline 1 and the on / off actuator 3, so that the fossil energy part in the fossil energy pipeline 1 flows to the on / off actuator 3 through the second switching valve 2. The pressure of the fossil energy itself drives the on / off actuator 3 to switch the first switching valve to the connected state. This method is time-saving, labor-saving, and highly safe to operate. It can effectively overcome the situation where the first switching valve is located in a simple environment such as the field and lacks an external power source, and can effectively avoid additional energy consumption.

[0030] Fossil energy is a non-renewable energy source formed from the remains of ancient organisms under the earth's strata over a long geological period. Its main components are hydrocarbons or their derivatives, including coal, oil, and natural gas.

[0031] In this embodiment, natural gas is used as an example of the fossil energy flowing in the fossil energy pipeline 1.

[0032] For example, the on / off actuator 3 that drives the first switching valve to switch on / off states includes a cylinder and an elastic element. The cylinder includes a cylinder body and a piston slidably disposed in the cylinder body. The piston body divides the cylinder body into a first chamber and a second chamber. The elastic element is located in the first chamber and its two ends correspond to the inner wall of the first chamber and the piston body. The piston rod of the piston extends out of the first chamber and connects to the first switching valve to drive the first switching valve to switch on / off states. The output end of the second switching valve 2 is connected to the second chamber. When it is necessary to control the first switching valve to switch to the on state, the second switching valve 2 is controlled to connect the fossil energy pipeline 1 and the second chamber of the on / off actuator 3, so that the fossil energy portion in the fossil energy pipeline 1 flows to the second chamber of the on / off actuator 3 through the second switching valve 2, driving the piston to move and driving the first switching valve to switch to the on state. At the same time, the elastic element is compressed. When it is necessary to control the first switching valve to switch to the off state, the second switching valve 2 is controlled to disconnect the fossil energy pipeline 1 and the second chamber of the on / off actuator 3. The elastic restoring force of the elastic element drives the piston to move and driving the first switching valve to switch to the off state. Understandably, other types of on / off actuators 3 can also be used, as long as they can drive the first switching valve to switch on / off states.

[0033] Optionally, such as Figure 1 As shown, the switching valve control system also includes two two-position two-way pilot valves 4. The pilot ends of both two two-position two-way pilot valves 4 are connected to the fossil energy pipeline 1, and the input ends of both two two-position two-way pilot valves 4 are connected to the output end of the second switching valve 2. The pilot pressure that drives one two-position two-way pilot valve 4 to switch to the connected state is greater than or equal to the first limit pressure, and the pilot pressure that drives the other two-position two-way pilot valve 4 to switch to the connected state is less than or equal to the second limit pressure. The first limit pressure is greater than the second limit pressure. The pressure at which the on / off actuator 3 drives the first switching valve to switch to the connected state is greater than the second limit pressure and less than the first limit pressure.

[0034] Specifically, the two two-position two-way pilot valves 4 are respectively a first two-position two-way pilot valve and a second two-position two-way pilot valve. The pilot pressure for the first two-position two-way pilot valve to switch to the connected state is greater than or equal to the first limit pressure, and the pilot pressure for the second two-position two-way pilot valve to switch to the connected state is less than or equal to the second limit pressure. Further, as... Figure 1 As shown, when the first two-position two-way pilot valve is in the lower position, its input and output terminals are connected, and the valve is switched to the connected state. When the first two-position two-way pilot valve is in the upper position, its input and output terminals are disconnected, and the valve is switched to the disconnected state. Further, as... Figure 1As shown, when the second two-position two-way pilot valve is in the upper position, the input end of the second two-position two-way pilot valve and the output end of the second two-position two-way pilot valve are connected, and the second two-position two-way pilot valve is switched to the connected state; when the second two-position two-way pilot valve is in the lower position, the input end of the second two-position two-way pilot valve and the output end of the second two-position two-way pilot valve are disconnected from each other, and the second two-position two-way pilot valve is switched to the disconnected state.

[0035] Specifically, when it is necessary to control the first switching valve to switch to the connected state, if the pilot pressure of driving the two two-position two-way pilot valves 4 is greater than the second limit pressure and less than the first limit pressure, then after controlling the second switching valve 2 to connect the fossil energy pipeline 1 and the on / off actuator 3, the fossil energy part in the fossil energy pipeline 1 flows to the on / off actuator 3 through the second switching valve 2, and the on / off actuator 3 is driven by the pressure of the fossil energy itself to drive the first switching valve to switch to the connected state.

[0036] Since the pressure at which the on / off actuator 3 drives the first switching valve to switch to the connected state is greater than the second limit pressure and less than the first limit pressure, when the gas pressure of fossil energy in the fossil energy pipeline 1 is greater than or equal to the first limit pressure or less than or equal to the second limit pressure, it is considered an abnormal pressure for switching the first switching valve to the on / off state.

[0037] Therefore, a first two-position two-way pilot valve is set. When the pilot pressure for switching the first two-position two-way pilot valve to the connected state is greater than or equal to the first limit pressure, the first two-position two-way pilot valve automatically switches to the connected state. The fossil fuel output by the second switching valve 2 is divided into a first part and a second part. The first part of the fossil fuel flows to the on / off actuator 3 to drive the first switching valve to the connected state, and the second part of the fossil fuel flows to the first two-position two-way pilot valve and is discharged by the first two-position two-way pilot valve. This ensures that the first switching valve is switched to the connected state stably and effectively, while also improving the safety of the switching valve control system. It can be understood that when driving the two... When the pilot pressure of the two-position two-way pilot valve 4 is less than the first limit pressure, the first two-position two-way pilot valve automatically switches to the off state. When the pilot pressure of driving the two two-position two-way pilot valves 4 is less than the second limit pressure, the second two-position two-way pilot valve automatically switches to the connected state, releasing the fossil fuel in the on / off actuator 3. At this time, the first switch valve switches to the off state. When the pilot pressure of driving the two two-position two-way pilot valves 4 is greater than the second limit pressure and less than the first limit pressure, the fossil energy portion in the fossil energy pipeline 1 flows to the on / off actuator 3 through the second switch valve 2. The pressure of the fossil energy itself drives the on / off actuator 3 to switch the first switch valve to the connected state.

[0038] When the pressure of fossil energy in fossil energy pipeline 1 is less than the second limit pressure, the second two-position two-way pilot valve automatically switches to the connected state. At this time, the pressure of fossil energy is insufficient to drive the first switching valve to switch to the connected state. All fossil energy output by the second switching valve 2 is discharged through the second two-position two-way pilot valve, which can effectively shut off the first switching valve and improve the safety of the switching valve control system.

[0039] Specifically, both the first and second limit pressures are pressure values ​​given based on the oil and gas field production process.

[0040] Further optional, such as Figure 1 As shown, the switching valve control system also includes a third switching valve 5, which is located at the input end of a two-position two-way pilot valve 4 with a pilot pressure less than or equal to the second limit pressure.

[0041] Specifically, the pipeline connecting the output of the second switching valve 2 to the input of the on / off actuator 3 is defined as the first connecting pipeline. The pipeline connecting the first connecting pipeline to the input of the first two-position two-way pilot valve is defined as the second connecting pipeline. The pipeline connecting the first connecting pipeline to the input of the second two-position two-way pilot valve is defined as the third connecting pipeline. The third switching valve 5 is located in the third connecting pipeline and at the input of the second two-position two-way pilot valve.

[0042] When the second switching valve 2 starts to switch to the connected state, the pressure in the first, second, and third connecting pipelines is relatively low. By setting the third switching valve 5 at the input end of the second two-position two-way pilot valve, the third switching valve 5 is switched to the disconnected state while the second switching valve 2 switches to the connected state. This allows the first, second, and third connecting pipelines to build up pressure quickly. Before the pressure is built up, fossil energy can be prevented from being discharged through the third connecting pipeline and the second two-position two-way pilot valve. This further improves the reliability of the switching valve control system and further avoids additional energy consumption.

[0043] Further optional, such as Figure 1 As shown, the on / off valve control system also includes a storage tank 6, and the outputs of both two two-position two-way pilot valves 4 are connected to the storage tank 6. Specifically, the outputs of both the first and second two-position two-way pilot valves are connected to the storage tank 6. This configuration allows fossil fuels discharged from the outputs of both the first and second two-position two-way pilot valves to be recycled back into the storage tank 6 for reuse, effectively improving the utilization rate of these fossil fuels and preventing pollution and waste caused by their release into the environment.

[0044] Further optionally, the output of the storage tank 6 can be selectively connected to the second chamber of the on / off actuator 3; and / or, the switching valve control system further includes a backup gas tank, which can be selectively connected to the second chamber of the on / off actuator 3.

[0045] In this embodiment, the output end of the storage tank 6 is preferably selectively connected to the second chamber of the on / off actuator 3; and the switching valve control system also includes a spare gas tank, which is selectively connected to the second chamber of the on / off actuator 3.

[0046] When the pressure of fossil fuel gas in fossil fuel pipeline 1 is less than the second limit pressure, and it is necessary to control the first switching valve to the connected state: If the pressure of fossil fuel gas in storage tank 6 is sufficient to drive the on / off actuator 3 to switch the first switching valve to the connected state, the output end of storage tank 6 is connected to the second chamber of on / off actuator 3, and the fossil fuel gas in storage tank 6 drives the on / off actuator 3 to switch the first switching valve to the connected state; if the pressure of fossil fuel gas in storage tank 6 is insufficient to drive the on / off actuator 3 to switch the first switching valve to the connected state, the backup gas tank is connected to the second chamber of on / off actuator 3, and the fossil fuel gas in the backup gas tank drives the on / off actuator 3 to switch the first switching valve to the connected state. Therefore, even if the pressure of fossil fuel gas in fossil fuel pipeline 1 is less than the second limit pressure, the on / off state of the first switching valve can be reliably switched.

[0047] Optionally, the second switching valve 2 is a manual one-way switching valve. Specifically, the second switching valve 2 is a two-position, two-way manual one-way switching valve. For example... Figure 1 As shown, when the second switching valve 2 is in the upper position, the input end and the output end of the second switching valve 2 are connected in one direction, so that fossil energy can only be transported from the fossil energy pipeline 1 to the on / off actuator 3, the first two-position two-way pilot valve and the second two-position two-way pilot valve, to prevent backflow and further improve the safety of the switching valve control system; when the second switching valve 2 is in the lower position, the input end and the output end of the second switching valve 2 are disconnected from each other.

[0048] Alternatively, the second switching valve 2 can be a normally closed switching valve. This configuration ensures that the second switching valve 2 is only switched to the open position when the first switching valve is switched to the connected state, thereby further improving the operational safety of the switching valve control system.

[0049] More specifically, such as Figure 1As shown, the second switching valve 2 is equipped with an operation button 21. It is understood that the second switching valve 2 is a manually operated valve. Pressing the operation button 21 controls the second switching valve 2 to the upper position, switching it to the connected state; releasing the operation button 21 automatically switches the second switching valve 2 to the lower position, switching it to the disconnected state. The specific structure of the second switching valve 2 is prior art and will not be described in detail here. In other embodiments, the second switching valve 2 can also be configured as an electrically operated valve.

[0050] Optionally, such as Figure 1 As shown, the switching valve control system also includes a fourth switching valve 7, which is installed on the pipeline connecting the fossil energy pipeline 1 and the second switching valve 2. By installing the fourth switching valve 7 on the pipeline connecting the fossil energy pipeline 1 and the second switching valve 2, when maintenance is required on the fossil energy pipeline 1, the second switching valve 2 is controlled to switch to the off state, thereby further improving the operational safety of the switching valve control system. Specifically, in this embodiment, the pilot ends of both two two-position two-way pilot valves 4 are connected to the pipeline connecting the output end of the fourth switching valve 7 and the input end of the second switching valve 2.

[0051] Alternatively, the fourth switching valve 7 is a normally open switching valve. Under normal operating conditions, the fourth switching valve 7 remains open, allowing the fossil energy in the fossil energy pipeline 1 to flow smoothly to the second switching valve 2.

[0052] Alternatively, the fourth switching valve 7 can be a manually operated switching valve. In other embodiments, the fourth switching valve 7 can also be an electrically operated switching valve.

[0053] Optionally, such as Figure 1 As shown, the switching valve control system also includes a valve block 8. The valve block 8 has a connecting flow channel 81, which includes a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port. The first connecting port is connected to the fossil fuel pipeline 1, the second connecting port is connected to the input end of the second switching valve 2, and the third and fourth connecting ports are correspondingly connected to the pilot ends of the two two-position two-way pilot valves 4. Specifically, in this embodiment, the first connecting port is connected to the output end of the fourth switching valve 7, and the input end of the fourth switching valve 7 is connected to the fossil fuel pipeline 1. This achieves the connection of the input end of the second switching valve 2 and the pilot ends of the two two-position two-way pilot valves 4 to the fossil fuel pipeline 1. Furthermore, compared to using pipelines to connect the input end of the second switching valve 2 and the pilot ends of the two two-position two-way pilot valves 4 to the fossil fuel pipeline 1, the number of components is reduced.

[0054] In other embodiments, a fourth connecting pipe connects the output of the fourth switching valve 7 to the input of the second switching valve 2. A fifth connecting pipe connects the output of the fourth switching valve 7 to the pilot end of the first two-position two-way pilot valve. A sixth connecting pipe connects the output of the fourth switching valve 7 to the pilot end of the second two-position two-way pilot valve. A seventh connecting pipe connects the input of the fourth switching valve 7 to the fossil fuel pipeline 1.

[0055] This invention also provides a switching valve control method for implementation in the aforementioned switching valve control system. This method enables the first switching valve to be switched to the connected state in a time-saving and labor-saving manner, while avoiding additional energy consumption and improving operational safety.

[0056] The valve control method includes:

[0057] When a command is received to switch the first switching valve to the connected state, the second switching valve 2 is controlled to connect the fossil energy pipeline 1 and the on / off actuator 3; when a command is received to switch the first switching valve to the disconnected state, the second switching valve 2 is controlled to disconnect the fossil energy pipeline 1 and the on / off actuator 3.

[0058] Specifically, in this embodiment, after the first switch valve is switched to the connected state, the operation button 21 is released, and the second switch valve 2 automatically switches to the lower station and switches to the disconnected state.

[0059] This configuration allows for time-saving and labor-saving control of the on / off state of the first switching valve while avoiding additional energy consumption and improving safety.

[0060] Optionally, when the second switching valve 2 begins to switch to the connected state, the pressure in the first, second, and third connecting pipelines is relatively low; when fossil energy pipeline 1 begins to receive fossil energy and the second switching valve 2 simultaneously switches to the connected state, the pressure in the pipeline connecting the fossil energy pipeline 1 and the input end of the second switching valve 2 is relatively low. Therefore, for the above two situations, the switching valve control method further includes:

[0061] When the second switching valve 2 connects the fossil energy pipeline 1 and the on / off actuator 3, the third switching valve 5 is simultaneously controlled to be in the off state; when the pressure of the fossil energy at the input end of the on / off actuator 3 is greater than the second limit pressure, the third switching valve 5 is controlled to be in the on state.

[0062] This configuration ensures that when the second switching valve 2 begins to switch to the connected state, the first, second, and third connecting pipelines can all quickly build up pressure. Furthermore, it effectively prevents fossil fuels from leaking through the third connecting pipeline and the second two-position two-way pilot valve before pressure is achieved. Similarly, when fossil fuel pipeline 1 begins to supply fossil fuels, and the second switching valve 2 simultaneously switches to the connected state, it also prevents fossil fuels from leaking through the third connecting pipeline and the second two-position two-way pilot valve before pressure is achieved. This effectively improves the reliability of the switching valve control system and avoids additional energy consumption.

[0063] In this embodiment, the pressures mentioned above are all air pressures.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A switching valve control system for controlling the on / off state of a first switching valve, characterized in that, The switching valve control system includes a fossil energy pipeline (1), a second switching valve (2), and an on / off actuator (3); the fossil energy pipeline (1) is used to circulate fossil energy; the input end of the second switching valve (2) is connected to the fossil energy pipeline (1), and the output end of the second switching valve (2) is connected to the on / off actuator (3); the on / off actuator (3) is used to drive the first switching valve to switch on / off states.

2. The on / off valve control system according to claim 1, characterized in that, The switching valve control system also includes two two-position two-way pilot valves (4), the pilot ends of the two two-position two-way pilot valves (4) are connected to the fossil energy pipeline (1), and the input ends of the two two-position two-way pilot valves (4) are connected to the output end of the second switching valve (2); The pilot pressure that drives one of the two-position two-way pilot valves (4) to switch to the connected state is greater than or equal to the first limit pressure, and the pilot pressure that drives the other two-position two-way pilot valve (4) to switch to the connected state is less than or equal to the second limit pressure, wherein the first limit pressure is greater than the second limit pressure; the pressure at which the on / off actuator (3) drives the first switching valve to switch to the connected state is greater than the second limit pressure and less than the first limit pressure.

3. The on / off valve control system according to claim 2, characterized in that, The switching valve control system further includes a third switching valve (5), which is located at the input end of a two-position two-way pilot valve (4) whose pilot pressure is less than or equal to the second limit pressure.

4. The on / off valve control system according to claim 2, characterized in that, The switching valve control system also includes a storage tank (6), and the output ends of the two two-position two-way pilot valves (4) are connected to the storage tank (6).

5. The on / off valve control system according to any one of claims 1-4, characterized in that, The second switching valve (2) is a one-way switching valve. The second switching valve (2) can connect the fossil energy pipeline (1) and the on / off actuator (3) in one direction, so that the fossil energy in the fossil energy pipeline (1) flows to the on / off actuator (3).

6. The on / off valve control system according to claim 5, characterized in that, The second switching valve (2) is a manual one-way switching valve.

7. The on / off valve control system according to any one of claims 1-4, characterized in that, The switching valve control system further includes a fourth switching valve (7), which is located on the pipeline connecting the fossil energy pipeline (1) and the second switching valve (2). The fourth switching valve (7) is a normally open switching valve, and the second switching valve (2) is a normally closed switching valve.

8. The on / off valve control system according to any one of claims 2-4, characterized in that, The switching valve control system further includes a valve block (8), which is provided with a connecting flow channel (81). The connecting flow channel (81) includes a first connecting port, a second connecting port, a third connecting port and a fourth connecting port. The first connecting port is connected to the fossil energy pipeline (1), the second connecting port is connected to the input end of the second switching valve (2), and the third connecting port and the fourth connecting port are connected to the pilot ends of the two two-position two-way pilot valves (4) respectively.

9. A method for controlling an on / off valve, characterized in that, For implementation in any one of claims 1-8, the valve control method comprises: When a command is received to switch the first switch valve to the connected state, the second switch valve (2) is controlled to connect the fossil energy pipeline (1) and the on / off actuator (3); when a command is received to switch the first switch valve to the disconnected state, the second switch valve (2) is controlled to disconnect the fossil energy pipeline (1) and the on / off actuator (3).

10. The on / off valve control method according to claim 9, characterized in that, The switching valve control system further includes a third switching valve (5) and two two-position two-way pilot valves (4); the pilot ends of the two two-position two-way pilot valves (4) are connected to the fossil energy pipeline (1), and the input ends of the two two-position two-way pilot valves (4) are connected to the output end of the second switching valve (2); the pilot pressure that drives one of the two-position two-way pilot valves (4) to switch to the connected state is greater than or equal to the first limit pressure, and the pilot pressure that drives the other two-position two-way pilot valve (4) to switch to the connected state is less than or equal to the second limit pressure, wherein the first limit pressure is greater than the second limit pressure; the pressure at which the on / off actuator (3) drives the first switching valve to switch to the connected state is greater than the second limit pressure and less than the first limit pressure; the third switching valve (5) is located at the input end of the two-position two-way pilot valve (4) whose pilot pressure is less than or equal to the second limit pressure; the switching valve control method further includes: When the second switching valve (2) is connected to the fossil energy pipeline (1) and the on / off actuator (3), the third switching valve (5) is simultaneously controlled to be in the off state; when the pressure of the fossil energy at the input end of the on / off actuator (3) is greater than the second limit pressure, the third switching valve (5) is controlled to be in the connected state.

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