Gas path system for improving reliability of stop valve

Abstract

A gas circuit system for improving the reliability of a stop valve comprises a first pipeline with one end communicated with an actuator control valve, a gas-mist separator, a first one-way valve, a first pressure reducing valve and a first two-position two-way valve which are sequentially communicated with the first pipeline, and further comprises a second pipeline. One end of a second pipeline is communicated with the first pipeline between the gas-mist separator and the first one-way valve, the other end of the second pipeline is communicated with the first pipeline between the actuator control valve and the first two-position two-way valve, and a second one-way valve, a second two-position two-way valve, a pneumatic pressure increasing valve, a gas storage bottle, a second pressure reducing valve and a third two-position two-way valve are sequentially mounted on the second pipeline. The stop valve is used for solving the problem that the stop valve cannot be opened and closed due to insufficient air supply of an air source pipeline.

Description

Technical Field

[0001] The utility model relates to a gas circuit system for improving the reliability of a cut-off valve. Background Art

[0002] The cut-off valve is a kind of automatic safety instrument widely used in chemical plants. With the improvement of the automation level of the plant and the reduction of operators, the cut-off valve has been widely used. At the same time, with the improvement of the national requirements for the safety of the plant, the reliability of the cut-off valve is particularly important. However, it is found in actual use that for the gas circuit design of some cut-off valves of each valve manufacturer, there is a situation where the air control valve sometimes cannot commutate normally, resulting in the cut-off valve being unable to open or close. For example, when the air supply pipeline supplies insufficient gas, if the cut-off valve cannot open or close, there will be a great safety risk and it is easy to occur safety accidents. Content of the Utility Model

[0003] The purpose of the utility model is to provide a gas circuit system for improving the reliability of a cut-off valve, which is used to solve the problem that the cut-off valve cannot open or close due to insufficient gas supply in the air supply pipeline.

[0004] In order to solve the above problems, the technical solution of the utility model is as follows:

[0005] A gas circuit system for improving the reliability of a cut-off valve includes a first pipeline connected to an actuator control valve at one end. A mist separator, a first one-way valve, a first pressure reducing valve and a first two-way two-position valve are sequentially connected in the first pipeline. It also includes a second pipeline. One end of the second pipeline is connected to the first pipeline between the mist separator and the first one-way valve, and the other end is connected to the first pipeline between the control valve and the first two-way two-position valve. A second one-way valve, a second two-way two-position valve, a pneumatic booster valve, a gas storage cylinder, a second pressure reducing valve and a third two-way two-position valve are sequentially installed in the second pipeline.

[0006] It further includes a first pressure sensor and a second pressure sensor. The first pressure sensor is connected to the first pipeline between the first pressure reducing valve and the first two-way two-position valve, and the second pressure sensor is connected to the second pipeline between the second pressure reducing valve and the third two-way two-position valve.

[0007] The first two-way two-position valve, the second two-way two-position valve and the third two-way two-position valve are all solenoid valves. The first pressure sensor and the second pressure sensor are connected to the input end of the controller, and the first two-way two-position valve, the second two-way two-position valve and the third two-way two-position valve are connected to the output end of the controller.

[0008] A bypass pipe is connected in parallel to the third two-way two-position valve, and a normally closed stop valve is installed on the bypass pipe.

[0009] The beneficial effects of the present utility model are as follows: A second pipeline is connected in parallel to the pipeline connecting the actuator control valve. Meanwhile, a pneumatic booster valve and a gas storage cylinder are added to the second pipeline. When the air pressure in the air source pipeline is insufficient, the air in the gas storage cylinder automatically enters the actuator to ensure the normal operation of the actuator and the opening and closing speed and reliability of the cut-off valve. Description of the Drawings

[0010] The following further describes the present utility model with reference to the drawings:

[0011] Figure 1 It is a schematic structural diagram of the present utility model.

[0012] Figure 2 It is a circuit diagram of the present utility model.

[0013] In the figure: aerosol separator 1, first pipeline 2, first check valve 3, first pressure reducing valve 4, first pressure sensor 5, first two-position two-way valve 6, actuator 7, control valve 8, second pressure sensor 9, normally closed stop valve 10, third two-position two-way valve 11, second pressure reducing valve 12, gas storage cylinder 13, pneumatic booster valve 14, second pipeline 15, second two-position two-way valve 16, second check valve 17. Detailed Embodiment

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0015] As Figure 1 and 2 shown, a gas circuit system for improving the reliability of a cut-off valve includes a first pipeline 2 with one end connected to the actuator control valve 8. An aerosol separator 1, a first check valve 3, a first pressure reducing valve 4, and a normally open first two-position two-way valve 6 are sequentially connected in the first pipeline 2. It also includes a second pipeline 15. One end of the second pipeline 15 is connected to the first pipeline 2 between the aerosol separator 1 and the first check valve 3, and the other end is connected to the first pipeline 2 between the control valve 8 and the first two-position two-way valve 6. A second check valve 17, a normally open second two-position two-way valve 16, a pneumatic booster valve 14, a gas storage cylinder 13, a second pressure reducing valve 12, and a normally closed third two-position two-way valve 11 are sequentially installed on the second pipeline 15. Among them, the actuator 7 is docked with a cut-off valve (the cut-off valve is not shown in the figure), and the cut-off valve is driven to act through the pneumatic actuator 7 to realize the opening and closing of the cut-off valve. The first two-position two-way valve 6 is used to cut off the air supply from the air source.

[0016] It also includes a first pressure sensor 5 and a second pressure sensor 9. The first pressure sensor 5 is connected to the first pipeline 2 between the first pressure reducing valve 4 and the first two-position two-way valve 6, and the second pressure sensor 9 is connected to the second pipeline 15 between the second pressure reducing valve 12 and the third two-position two-way valve 11.

[0017] The first two-position two-way valve 6, the second two-position two-way valve 16 and the third two-position two-way valve 11 are all solenoid valves. The first pressure sensor 5 and the second pressure sensor 9 are connected to the input end of the controller, and the first two-position two-way valve 6, the second two-position two-way valve 16 and the third two-position two-way valve 11 are connected to the output end of the controller. The controller is a PLC controller, which realizes the automatic opening and closing of the cut-off valve.

[0018] A bypass pipe is connected in parallel to the third two-position two-way valve 11, and a normally closed stop valve 10 is installed on the bypass pipe. When the third two-position two-way valve 11 is damaged, the normally closed stop valve 10 is manually opened to allow air to enter the actuator 7 for emergency use.

[0019] The working process of the present utility model is as follows: In the normal state, the air source pressure meets the requirements. The compressed air passes through the first one-way valve 3, is reduced in pressure by the first pressure reducing valve 4, is measured by the first pressure sensor 5, and then enters the actuator 7 through the first two-position two-way valve 6. The cut-off valve is opened and closed by the actuator control valve 8. At the same time, the compressed air passes through the normally open second two-position two-way valve 16 and enters the pneumatic booster valve 14. The pneumatic booster valve 14 continuously injects the compressed air into the gas storage cylinder 13, so that the air pressure in the gas storage cylinder 13 increases. When the second pressure sensor 9 detects that the pressure value reaches the preset value, the PLC controller controls the second two-position two-way valve 16 to cut off, and the pneumatic booster valve 14 stops operating. At the same time, the gas storage cylinder 13 maintains the pressure. When the first pressure sensor 5 detects that the air source pressure is insufficient, the controller controls the third two-position two-way valve 11 to open, and the gas storage cylinder 13 supplies gas to the actuator 7. Then, it controls the second two-position two-way valve 16 to open to replenish and boost the pressure of the gas storage cylinder 13, so as to ensure that the control valve 8 can operate normally, and realize that when the air pressure in the air source pipeline is insufficient, the cut-off valve can be opened and closed normally.

[0020] The content described in the embodiments of this specification is only a list of the implementation forms of the utility model concept. The protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present utility model also extends to equivalent technical means that those skilled in the art can think of according to the utility model concept.

Claims

1. A gas circuit system for improving the reliability of a shut-off valve, comprising a first pipeline (2) having one end connected to an actuator control valve (8), characterized in that: The first pipeline (2) is connected in sequence to an aerosol separator (1), a first non-return valve (3), a first pressure reducing valve (4) and a first two-position two-way valve (6), and further comprises a second pipeline (15), one end of the second pipeline (15) being connected to the first pipeline (2) between the aerosol separator (1) and the first non-return valve (3), and the other end of the second pipeline (15) being connected to the first pipeline (2) between the control valve (8) and the first two-position two-way valve (6), and a second non-return valve (17), a second two-position two-way valve (16), a pneumatic booster valve (14), a gas storage bottle (13), a second pressure reducing valve (12) and a third two-position two-way valve (11) being installed in sequence on the second pipeline (15).

2. A gas circuit system for improving the reliability of a cut-off valve according to claim 1, characterized in that: The invention also comprises a first pressure sensor (5) and a second pressure sensor (9), wherein the first pressure sensor (5) is connected to a first pipeline (2) between the first pressure reducing valve (4) and the first two-position two-way valve (6), and the second pressure sensor (9) is connected to a second pipeline (15) between the second pressure reducing valve (12) and the third two-position two-way valve (11).

3. A gas circuit system for improving the reliability of a cut-off valve according to claim 2, characterized in that: The first two-position two-way valve (6), the second two-position two-way valve (16) and the third two-position two-way valve (11) are all solenoid valves; the first pressure sensor (5) and the second pressure sensor (9) are connected to an input end of a controller; and the first two-position two-way valve (6), the second two-position two-way valve (16) and the third two-position two-way valve (11) are connected to an output end of the controller.

4. A gas circuit system for improving the reliability of a cut-off valve according to any one of claims 1 to 3, characterized in that: A bypass pipe is connected to the third two-position two-way valve (11), and a normally closed stop valve (10) is installed on the bypass pipe.

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