Pressure regulating valve with cage sleeve capable of being replaced online and replacement method of pressure regulating valve

Abstract

The invention discloses a pressure regulating valve with a cage sleeve capable of being replaced online and a replacement method of the pressure regulating valve, and relates to the technical field of valves. The pressure regulating valve comprises a valve body; a valve seat; the adjusting cage sleeve comprises a plurality of cage sleeve sheet bodies, the cage sleeve sheet bodies can be combined into a single adjusting cage sleeve, the cage sleeve sheet bodies are detachably connected with the valve seat, and the corresponding pushing springs are in a compressed state when the cage sleeve sheet bodies are connected with the valve body; the separating valve is arranged on the upper portion of the valve body and divides the pressure regulating cavity into a working cavity and a mounting cavity from top to bottom, and the working cavity and the mounting cavity can both contain the regulating cage sleeve; the linear driving mechanism is arranged at the upper part of the valve body and can press the cage sleeve sheet body in the mounting cavity to a corresponding position of the valve seat; and the locking mechanism is arranged on the valve seat and can fix the corresponding cage sleeve sheet body on the valve seat, and the cage sleeve of the pressure regulating valve can be replaced under the condition that gas is not stopped. The replacement method is based on the pressure regulating valve, and the cage sleeve of the pressure regulating valve can be replaced without stopping gas supply.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a pressure regulating valve with a cage capable of being replaced online and a replacement method thereof. Background Art

[0002] Valves used for pressure regulation and control come in a wide variety of varieties and specifications, from the simplest stop valves to various valves used in extremely complex automatic control systems. The nominal diameter of the valves ranges from extremely small instrument valves to main pipeline valves with a diameter of DN600. The natural gas pressure regulating valve (cage-type throttle valve) is the main component of the natural gas station pressure regulating system, used to change the direction of gas flow, and has functions such as pressure control, volume control, stop, and throttling.

[0003] The natural gas pressure regulating valve is an important part of the pipeline. After long-term use, the cage part directly cuts off and throttles the fluid (at least one of gas, liquid and solid). Its surface is prone to erosion and wear, which affects the pressure regulating, throttling and sealing performance of the pressure regulating valve. The cage needs to be replaced in time to ensure the pressure control accuracy and sealing of the valve.

[0004] When replacing the cage of the existing natural gas pressure regulating valve, the upstream and downstream must be cut off to stop the gas. Not only is the procedure cumbersome and the replacement process time-consuming and laborious, but the gas supply needs to be interrupted, which will cause great economic losses. Summary of the invention

[0005] In view of the technical problem that the existing natural gas pressure regulating valve needs to be shut down to replace the cage sleeve, the present invention provides a pressure regulating valve with an online replaceable cage sleeve and a replacement method thereof, which can replace the cage sleeve of the pressure regulating valve without stopping the gas, so as to ensure the normal supply of natural gas and avoid economic losses caused by stopping the gas to replace the natural gas pressure regulating valve.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a pressure regulating valve with a cage sleeve that can be replaced online, comprising: a valve body, a lower portion of which is provided with an air inlet chamber and an air outlet chamber, a middle portion of which is provided with a pressure regulating chamber whose upper end can be opened, and the air outlet chamber is connected to the regulating chamber; a valve seat, arranged between the air inlet chamber and the pressure regulating chamber, and provided with a push spring; an adjusting cage sleeve, comprising a plurality of cage sleeve sheets, the plurality of cage sleeve sheets can be combined into a single adjusting cage sleeve, and each of the cage sleeve sheets is detachably connected to the valve seat, and the corresponding push spring is in a compressed state when the cage sleeve sheets are connected to the valve body; a separating valve, arranged on the upper portion of the valve body, separating the pressure regulating chamber from top to bottom into a working chamber and an installation chamber, both of which can accommodate the adjusting cage sleeve; a linear drive mechanism, arranged on the upper portion of the valve body, capable of pressing the cage sleeve sheets in the installation chamber to the corresponding position of the valve seat; a locking mechanism, arranged on the valve seat, capable of fixing the corresponding cage sleeve sheets on the valve seat.

[0008] The pressure regulating valve with an online replaceable cage provided by the present invention, the valve seat is arranged between the air inlet chamber and the pressure regulating chamber, and is provided with a push spring, the regulating cage is composed of a plurality of cage sheet bodies, and each cage sheet body is detachably connected to the valve seat, when the cage sheet body is connected to the valve body, the corresponding push spring is in a compressed state, a separating valve is arranged in the middle of the valve body to separate the pressure regulating chamber of the valve body from top to bottom into a working chamber and an installation chamber which can both accommodate the regulating cage sleeve, a linear driving mechanism is arranged on the upper part of the valve body, which can press the cage sheet body in the installation chamber to the corresponding position of the valve seat, and a locking mechanism is arranged on the valve seat, which can fix the corresponding cage sheet body on the valve seat.

[0009] Under normal working conditions, the cage segments that make up the regulating cage are all installed on the valve body and located in the working chamber, and the separation valve is in a closed state to ensure that the pressure regulating valve can work normally. When the regulating cage needs to be replaced, first release the restriction of the locking mechanism in the valve body on one cage segment, and then open the separation valve, so that the cage segment that has been released from the restriction enters the installation chamber under the action of the push spring and the gas pressure in the pipeline; then close the separation valve, open the installation chamber to replace the cage segment in the installation chamber with a new one; close the installation chamber again, open the separation valve, and press the new cage segment into the corresponding position through the linear drive mechanism, then lock the new cage segment through the locking mechanism, and close the separation valve to complete the replacement of the single cage segment. Repeat the above operations to completely replace the used cage segment.

[0010] In the process of replacing the cage sleeve, the installation cavity is open and the working cavity is closed by the separation valve, which will not cause leakage of natural gas; and in the process of installing the new cage sleeve into the working cavity, the installation cavity is closed, which will not cause a large amount of air to enter the natural gas pipeline, and the transportation safety of natural gas can be ensured. Therefore, the pressure regulating valve with online replaceable cage sleeve provided by the present invention can replace the cage sleeve of the pressure regulating valve without stopping the gas supply, so as to ensure the normal supply of natural gas and avoid economic losses caused by stopping the gas supply to replace the natural gas pressure regulating valve.

[0011] In a possible embodiment, a latching protrusion is provided at the lower end of each of the cage sheet bodies, and a latching groove is provided on one side of the latching protrusion; the locking mechanism includes a linear drive and a limit member, and the limit member is transmission-connected to the linear drive. When driven by the linear drive, the limit member can be inserted into the latching groove, so as to facilitate the removal of the cage sheet body from the valve seat while ensuring a reliable connection between the cage sheet body and the valve seat.

[0012] In an optional embodiment, the linear actuator is a servo valve, so that the locking mechanism has a sufficiently small volume to facilitate the installation of the locking mechanism.

[0013] In an optional embodiment, a plurality of mounting grooves are provided on the upper end surface of the valve seat, and the plurality of mounting grooves are evenly distributed along the circumference of the valve seat, and each of the latches can be inserted into the corresponding mounting groove, and the locking mechanism is provided in the mounting groove to facilitate the installation of the locking mechanism in the valve shaft.

[0014] In an optional embodiment, each outer side wall of the cage sheet is provided with a limiting groove, and the limiting groove extends downward along the upper end of the cage sheet; the valve body is provided with a limiting pin, the outer end of the limiting pin is inserted in the valve body, the inner end extends into the installation cavity, and the inner end of the limiting pin is located on the moving path of the limiting groove, so as to ensure the stability of the cage sheet during the up and down movement, avoid the cage sheet from getting stuck, and also ensure that the cage sheet is installed in place.

[0015] In an optional embodiment, four cage sheets are provided to facilitate installation and replacement while simplifying the number of installation and replacement.

[0016] In an optional embodiment, the valve body is provided with a replacement nozzle, and the replacement nozzle is communicated with the installation cavity to facilitate replacement of gas in the installation cavity.

[0017] In an optional embodiment, the separation valve is a gate valve to ensure that the separation valve has a sufficient opening degree, while reducing the volume of the separation valve, thereby reducing the overall volume of the pressure regulating valve.

[0018] In a second aspect, the present invention provides a method for online replacement of a pressure regulating valve cage, based on the above-mentioned pressure regulating valve with a cage that can be replaced online, comprising the following steps:

[0019] S10, releasing the restriction of the locking mechanism in the valve body on one cage sheet;

[0020] S20, opening the separation valve, so that the cage sheet body that has been released from the restriction enters the installation cavity under the action of the push spring and the gas pressure in the pipeline;

[0021] S30, closing the separation valve, opening the installation cavity, and replacing the cage sleeve body in the installation cavity with a new one;

[0022] S40, closing the installation cavity, opening the separation valve, and pressing the new cage sheet into the corresponding position through the linear drive mechanism;

[0023] S50, locking the new cage sheet body through the locking mechanism, and closing the separation valve;

[0024] S60, repeat S10 to S50 until all used cage sheet bodies are completely replaced.

[0025] The method for online replacement of a pressure regulating valve cage provided by the present invention first releases the restriction of a cage sleeve sheet body by a locking mechanism in a valve body, and then opens the separation valve, so that the cage sleeve sheet body with the restriction released enters the installation cavity under the action of a push spring and the gas pressure in a pipeline; then closes the separation valve, and opens the installation cavity to replace the cage sleeve sheet body in the installation cavity with a new one; closes the installation cavity again, opens the separation valve, and presses the new cage sleeve sheet body into the corresponding position by a linear drive mechanism, and then locks the new cage sleeve sheet body by a locking mechanism, and closes the separation valve to complete the replacement of the single cage sleeve sheet body, and repeats the above operations to completely replace the used cage sleeve sheet body.

[0026] Therefore, the method for online replacement of the pressure regulating valve cage provided by the present invention realizes replacement of the pressure regulating valve cage without stopping gas flow, thereby ensuring normal gas supply and avoiding economic losses caused by replacement of the natural gas pressure regulating valve due to gas stoppage.

[0027] In an optional embodiment, before opening the separation valve, the gas in the installation cavity is replaced with nitrogen to prevent leakage of natural gas in the pipeline and also to prevent air from entering the natural gas pipeline, thereby ensuring the transportation of natural gas.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] 1. The pressure-regulating valve with a cage that can be replaced online provided by the present invention, the valve seat is arranged between the air inlet chamber and the pressure-regulating chamber, and is provided with a push spring, the regulating cage is composed of a plurality of cage sheets, and each cage sheet is detachably connected to the valve seat, when the cage sheet is connected to the valve body, the corresponding push spring is in a compressed state, a separation valve is provided in the middle of the valve body to separate the pressure-regulating chamber of the valve body from top to bottom into a working chamber and an installation chamber that can both accommodate the regulating cage, a linear drive mechanism is provided on the upper part of the valve body, which can press the cage sheet in the installation chamber to the corresponding position of the valve seat, and a locking mechanism is provided on the valve seat, which can fix the corresponding cage sheet on the valve seat, and when the regulating cage needs to be replaced, the locking mechanism in the valve body is first released. The method is to restrict a cage sleeve sheet and then open the separating valve, so that the cage sleeve sheet that is released from the restriction can enter the installation cavity under the action of the pushing spring and the gas pressure in the pipeline; then close the separating valve, open the installation cavity to replace the cage sleeve sheet in the installation cavity with a new one; close the installation cavity again, open the separating valve, and press the new cage sleeve sheet into the corresponding position through the linear drive mechanism, and then lock the new cage sleeve sheet through the locking mechanism, and close the separating valve to complete the replacement of the single cage sleeve sheet. Repeat the above operations to completely replace the used cage sleeve sheet. Therefore, the cage sleeve of the pressure regulating valve can be replaced without stopping the gas, so as to ensure the normal supply of natural gas and avoid economic losses caused by replacing the natural gas pressure regulating valve due to gas outage.

[0030] 2. The method for online replacement of the pressure regulating valve cage provided by the present invention first releases the restriction of the locking mechanism in the valve body on a cage sheet, and then opens the separating valve, so that the cage sheet with the restriction released enters the installation cavity under the action of the push spring and the gas pressure in the pipeline; then closes the separating valve, and opens the installation cavity to replace the cage sheet in the installation cavity with a new one; closes the installation cavity again, opens the separating valve, and presses the new cage sheet into the corresponding position through the linear drive mechanism, and then locks the new cage sheet through the locking mechanism, and closes the separating valve to complete the replacement of the single-piece cage sheet, and repeats the above operations to completely replace the used cage sheet, thereby realizing the replacement of the cage of the pressure regulating valve without stopping the gas supply, so as to ensure the normal gas supply of natural gas and avoid economic losses caused by gas outage and replacement of the natural gas pressure regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] In the attached picture:

[0033] Figure 1 The present invention is a schematic structural diagram of a pressure regulating valve with a cage that can be replaced online according to an embodiment of the present invention.

[0034] Figure 2 The structure of the cage replacement assembly of the pressure regulating valve with online replaceable cage according to the embodiment of the present invention is schematically shown;

[0035] Figure 3 It is a schematic diagram of the exploded structure of the cage part and the valve seat part of the pressure regulating valve with online replaceable cage according to an embodiment of the present invention;

[0036] Figure 4 for Figure 3 An enlarged schematic diagram of part A.

[0037] Marks and corresponding parts names in the attached drawings:

[0038] 10-valve body, 11-air inlet chamber, 12-air outlet chamber, 13-pressure regulating chamber, 13a-working chamber, 13b-installation chamber, 14-limiting pin, 15-replacement nozzle;

[0039] 20-valve seat, 21-thrust spring, 22-installation groove;

[0040] 30-adjusting cage, 31-cage sheet, 32-clamping protrusion, 33-clamping groove, 34-limiting groove;

[0041] 40-Separation valve;

[0042] 50- linear drive mechanism;

[0043] 60-locking mechanism, 61-linear drive, 62-limiting member;

[0044] 70-Valve core. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0046] In the description of the embodiments of the present application, the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is conventionally placed when in use, or is the orientation or position relationship conventionally understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0047] At the same time, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example 1

[0049] Combination Figure 1 and Figure 2 The present embodiment provides a pressure regulating valve with a cage that can be replaced online, comprising: a valve body 10, wherein an air inlet cavity 11 and an air outlet cavity 12 are arranged at the lower part, and a pressure regulating cavity 13 with an openable upper end is arranged in the middle part, wherein the air outlet cavity 12 is communicated with the regulating cavity; a valve seat 20, which is arranged between the air inlet cavity 11 and the pressure regulating cavity 13 and is provided with a push spring 21; an adjusting cage 30, comprising a plurality of cage sheets 31, wherein the plurality of cage sheets 31 can be combined into a single adjusting cage 30, and each of the cage sheets 31 is detachably connected to the valve seat 20, wherein the cage sheets 31 are connected to the valve body 10. In the connected state, the corresponding push spring 21 is in a compressed state; the separating valve 40 is arranged on the upper part of the valve body 10, and divides the pressure regulating chamber 13 from top to bottom into a working chamber 13a and an installation chamber 13b, and both the working chamber 13a and the installation chamber 13b can accommodate the regulating cage 30; the linear drive mechanism 50 is arranged on the upper part of the valve body 10, and can press the cage sheet 31 in the installation chamber 13b to the corresponding position of the valve seat 20; the locking mechanism 60 is arranged on the valve seat 20, and can fix the corresponding cage sheet 31 on the valve seat 20.

[0050] Combination Figure 3 and Figure 4Specifically, each cage sheet 31 is provided with a latching protrusion 32 at the lower end, and a latching groove 33 is provided on one side of the latching protrusion 32; the locking mechanism 60 includes a linear driver 61 and a limit member 62, and the limit member 62 is transmission-connected to the linear driver 61. Under the drive of the linear driver 61, the limit member 62 can be inserted into the latching groove 33, which ensures that the cage sheet 31 is reliably connected to the valve seat 20, and facilitates the removal of the cage sheet 31 from the valve seat 20.

[0051] In this embodiment, the linear driver 61 is a servo valve, so that the locking mechanism 60 has a sufficiently small volume, which is convenient for the installation of the locking mechanism 60. Of course, a linear driver 61 such as an electromagnet can also be used to drive the limiter 62. For the linear drive mechanism 50, a gear rack mechanism can be used to shorten the height of the pressure regulating valve.

[0052] Among them, the upper end surface of the valve seat 20 is provided with a plurality of mounting grooves 22, and the plurality of mounting grooves 22 are evenly distributed along the circumference of the valve seat 20, and each of the protrusions 32 can be inserted into the corresponding mounting groove 22, and the locking mechanism 60 is arranged in the mounting groove 22 to facilitate the installation of the locking mechanism 60 in the valve shaft.

[0053] On this basis, the outer wall of each cage sheet 31 is provided with a limiting groove 34, and the limiting groove 34 extends downward along the upper end of the cage sheet 31; the valve body 10 is provided with a limiting pin 14, the outer end of the limiting pin 14 is inserted in the valve body 10, and the inner end extends into the installation cavity 13b, and the inner end of the limiting pin 14 is located on the moving path of the limiting groove 34, so as to ensure the stability of the cage sheet 31 during the up and down movement, avoid the cage sheet 31 from getting stuck, and also ensure that the cage sheet 31 is installed in place.

[0054] In this embodiment, the cage cover sheet 31 is provided with four, so as to simplify the number of installation and replacement while facilitating installation and replacement. Of course, other combed dragon cover sheets can also be used to combine into a single adjustment cage cover 30.

[0055] In addition, the valve body 10 is provided with a replacement nozzle 15, which is connected to the installation cavity 13b to facilitate replacement of gas in the installation cavity 13b. In order to simplify the structure of the pressure regulating valve, the limit pin 14 and the replacement nozzle 15 are coaxially arranged.

[0056] Preferably, the separation valve 40 is a gate valve to ensure that the separation valve 40 has a sufficient opening, while reducing the volume of the separation valve 40, thereby reducing the overall volume of the pressure regulating valve. It is understandable that when the gate of the separation valve 40 is closed, the stem of the valve core 70 is sealed and penetrates the middle of the gate.

[0057] It should be noted that, under normal operation, the cage sheet 31 constituting the regulating cage 30 is installed on the valve body 10 and located in the working chamber 13a, and the separation valve 40 is in a closed state to ensure that the pressure regulating valve can work normally. When the regulating cage 30 needs to be replaced, the restriction of the locking mechanism 60 in the valve body 10 on one cage sheet 31 is first released, and then the separation valve 40 is opened, so that the cage sheet 31 that has been released from the restriction enters the installation chamber 13b under the action of the push spring 21 and the gas pressure in the pipeline; then the separation valve 40 is closed, and the installation chamber 13b is opened to replace the cage sheet 31 in the installation chamber 13b with a new one; the installation chamber 13b is closed again, the separation valve 40 is opened, and the new cage sheet 31 is pressed into the corresponding position by the linear drive mechanism 50, and then the new cage sheet 31 is locked by the locking mechanism 60, and the separation valve 40 is closed to complete the replacement of the single cage sheet 31, and the used cage sheet 31 can be completely replaced by repeating the above operation.

[0058] In the process of replacing the cage sheet 31, the installation cavity 13b is opened and the working cavity 13a is closed by the separation valve 40, so that no leakage of natural gas will occur; and in the process of installing a new cage sheet into the working cavity 13a, the installation cavity 13b is closed, so that a large amount of air will not enter the natural gas pipeline, thereby ensuring the safe transportation of natural gas.

[0059] Therefore, the present embodiment provides that the cage of the pressure regulating valve can be replaced without stopping the gas flow, so as to ensure the normal supply of natural gas and avoid economic losses caused by replacing the natural gas pressure regulating valve due to stopping the gas flow.

[0060] Example 2

[0061] This embodiment provides a method for online replacement of a pressure regulating valve cage, based on the pressure regulating valve with an online replaceable cage of Embodiment 1, comprising the following steps:

[0062] S10 , releasing the restriction of the locking mechanism 60 in the valve body 10 on one cage sheet 31 .

[0063] Specifically, when replacing the regulating cage 30, the cage sheets 31 constituting the regulating cage 30 need to be replaced one by one. And during installation, nitrogen replacement is performed through the replacement nozzle 15 on the valve body 10 to replace the natural gas or air retained therein with nitrogen. Of course, other inert gases or gases with good stability can also be used for replacement.

[0064] The cage sheet 31 is connected to the valve body 10 in a card-card manner, and each cage sheet 31 corresponds to a linear driver 61 (servo valve). When the pressure regulating valve is in normal use, the servo valve is in a closed state. When the regulating cage 30 needs to be replaced, an opening signal needs to be input to the servo valve to open the servo valve so that the limiter 62 is withdrawn from the card slot 33, so that the cage sheet 31 can be separated from the valve body 10.

[0065] S20, opening the separation valve 40, so that the cage sheet 31 that has been released from restriction enters the installation cavity 13b under the action of the push spring 21 and the gas pressure in the pipeline.

[0066] It can be understood that when the cage sheet 31 is separated from the valve body 10, when the separation valve is open, the gas in the pressure regulating chamber 13 will enter the installation chamber 13b. Therefore, after opening the separation valve 40, the cage sheet 31 that is released from the restriction can completely enter the installation chamber 13b under the action of the push spring 21 and the gas pressure in the pipeline.

[0067] S30, closing the separation valve 40, and opening the installation cavity 13b, and replacing the cage sheet body 31 in the installation cavity 13b with a new one.

[0068] That is, after closing the separation valve 40, the connection between the natural gas pipeline and the installation cavity 13b is disconnected, and after opening the installation cavity 13b, the gas in the installation cavity 13b is automatically discharged, and the cage sheet 31 in the installation cavity 13b can be taken out and replaced with a new cage sheet 31. After the new cage sheet 31 is placed in, the corresponding limit pin 14 is inserted into the limit groove 34 thereon.

[0069] S40, closing the installation cavity 13b, opening the separation valve 40, and pressing the new cage sheet 31 into the corresponding position through the linear drive mechanism 50.

[0070] Specifically, during installation, the linear drive mechanism 50 needs to be transmission-connected to the cage sheet 31. After the connection is completed, the installation cavity 13b is closed, and the gas in the installation cavity 13b is replaced with nitrogen. After the replacement, the separating valve 40 is opened, and the linear drive mechanism 50 is used to push the new cage sheet 31 downward onto the valve seat 20, so that the locking protrusion 32 is inserted into the corresponding limit groove 34.

[0071] S50 , locking the new cage sheet 31 through the locking mechanism 60 , and closing the separation valve 40 .

[0072] That is, the servo valve drives the limiter 62 to move into the corresponding slot 33, so that the cage sheet 31 is completely engaged with the valve seat 20, and the separation valve 40 is closed to replace the gas in the safety chamber with nitrogen.

[0073] S60, repeat S10 to S50 until all used cage sheet bodies 31 are completely replaced.

[0074] That is to say, in this embodiment, the restriction of the locking mechanism 60 in the valve body 10 on one cage sheet 31 is first released, and then the separation valve 40 is opened, so that the cage sheet 31 whose restriction is released enters the installation cavity 13b under the action of the push spring 21 and the gas pressure in the pipeline; then the separation valve 40 is closed, and the installation cavity 13b is opened to replace the cage sheet 31 in the installation cavity 13b with a new one; the installation cavity 13b is closed again, the separation valve 40 is opened, and the new cage sheet 31 is pressed into the corresponding position by the linear drive mechanism 50, and then the new cage sheet 31 is locked by the locking mechanism 60, and the separation valve 40 is closed to complete the replacement of the single-piece cage sheet 31, and the aforementioned operation is repeated to completely replace the used cage sheet 31.

[0075] Before opening the separation valve 40 , the gas in the installation cavity 13 b is replaced with nitrogen, which can prevent the leakage of natural gas in the pipeline and also prevent air from entering the natural gas pipeline, thereby ensuring the transportation of natural gas.

[0076] Therefore, the method for online replacement of the pressure regulating valve cage provided in this embodiment realizes the replacement of the pressure regulating valve cage without stopping the gas flow, thereby ensuring the normal supply of natural gas and avoiding economic losses caused by stopping the gas flow to replace the natural gas pressure regulating valve.

[0077] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure regulating valve with a cage that can be replaced online, characterized in that: include: A valve body (10) is provided with an air inlet cavity (11) and an air outlet cavity (12) at the lower part, and a pressure regulating cavity (13) with an openable upper end is provided at the middle part, and the air outlet cavity (12) is communicated with the regulating cavity; A valve seat (20) is arranged between the air inlet chamber (11) and the pressure regulating chamber (13), and is provided with a push spring (21); An adjusting cage (30) comprises a plurality of cage sheets (31), wherein the plurality of cage sheets (31) can be combined into a single adjusting cage (30), and each of the cage sheets (31) is detachably connected to the valve seat (20), and when the cage sheets (31) are connected to the valve body (10), the corresponding push spring (21) is in a compressed state; a separation valve (40) disposed on the upper part of the valve body (10) to separate the pressure regulating chamber (13) from top to bottom into a working chamber (13a) and an installation chamber (13b), wherein both the working chamber (13a) and the installation chamber (13b) are capable of accommodating the regulating cage (30); A linear drive mechanism (50) is arranged on the upper part of the valve body (10) and is capable of pressing the cage sheet (31) in the installation cavity (13b) to a corresponding position of the valve seat (20); The locking mechanism (60) is arranged on the valve seat (20) and is capable of fixing the corresponding cage sheet (31) on the valve seat (20).

2. The pressure regulating valve with online replaceable cage according to claim 1, characterized in that: A locking protrusion (32) is provided at the lower end of each of the cage sheet bodies (31), and a locking groove (33) is provided on one side of the locking protrusion (32); The locking mechanism (60) comprises a linear drive (61) and a limiting member (62); the limiting member (62) is transmission-connected to the linear drive (61); and the limiting member (62) can be inserted into the card slot (33) under the drive of the linear drive (61).

3. The pressure regulating valve with online replaceable cage according to claim 2, characterized in that: The linear drive (61) is a servo valve.

4. The pressure regulating valve with online replaceable cage according to claim 2 or 3, characterized in that: The upper end surface of the valve seat (20) is provided with a plurality of mounting grooves (22), and the plurality of mounting grooves (22) are evenly distributed along the circumference of the valve seat (20), and each of the locking protrusions (32) can be inserted into the corresponding mounting groove (22), and the locking mechanism (60) is arranged in the mounting groove (22).

5. The pressure regulating valve with online replaceable cage according to claim 1, characterized in that: The outer side wall of each cage sheet (31) is provided with a limiting groove (34), and the limiting groove (34) extends downward along the upper end of the cage sheet (31); The valve body (10) is provided with a limit pin (14), the outer end of the limit pin (14) is inserted into the valve body (10), the inner end extends into the installation cavity (13b), and the inner end of the limit pin (14) is located on the moving path of the limit groove (34).

6. The pressure regulating valve with online replaceable cage according to claim 1, characterized in that: Four cage sheet bodies (31) are provided.

7. The pressure regulating valve with online replaceable cage according to claim 1, characterized in that: The valve body (10) is provided with a replacement nozzle (15), and the replacement nozzle (15) is communicated with the installation cavity (13b).

8. The pressure regulating valve with online replaceable cage according to claim 1, characterized in that: The separation valve (40) is a gate valve.

9. A method for replacing a pressure regulating valve cage online, characterized in that: The pressure regulating valve with online replaceable cage according to any one of claims 1 to 8 comprises the following steps: S10, releasing the restriction of the locking mechanism (60) in the valve body (10) on one cage sheet (31); S20, opening the separation valve (40), so that the cage sheet (31) that has been released from restriction enters the installation cavity (13b) under the action of the push spring (21) and the gas pressure in the pipeline; S30, closing the separation valve (40), opening the installation cavity (13b), and replacing the cage sheet (31) in the installation cavity (13b) with a new one; S40, closing the installation cavity (13b), opening the separation valve (40), and pressing the new cage sheet (31) into the corresponding position through the linear drive mechanism (50); S50, locking the new cage sheet (31) through the locking mechanism (60) and closing the separation valve (40); S60, repeat S10 to S50 until all used cage sheet bodies (31) are completely replaced.

10. The method for online replacement of a pressure regulating valve cage according to claim 9, characterized in that: Before opening the separation valve (40), the gas in the installation cavity (13b) is replaced with nitrogen.

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