Pressure regulating valve with replaceable cage and method of replacing the same

Abstract

The application discloses a pressure regulating valve with a replaceable cage and a replacement method thereof, and relates to the technical field of valves.The pressure regulating valve comprises a valve body, a valve seat, an adjusting cage, a separating valve, a linear driving mechanism and a locking mechanism.The adjusting cage comprises a plurality of cage pieces, and the plurality of cage pieces can be combined into a single adjusting cage.The adjusting cage is detachably connected with the valve seat, and corresponding push springs are in a compressed state when the cage pieces are connected with the valve body.The separating valve is arranged on the upper part of the valve body, and separates a pressure regulating cavity into a working cavity and a mounting cavity from top to bottom.The working cavity and the mounting cavity can accommodate the adjusting cage.The linear driving mechanism is arranged on the upper part of the valve body, and can press the cage pieces in the mounting cavity to corresponding positions of the valve seat.The locking mechanism is arranged on the valve seat, and can fix the corresponding cage pieces on the valve seat, so that the cage of the pressure regulating valve can be replaced without stopping gas.The replacement method is based on the aforementioned pressure regulating valve, and can replace the cage of the pressure regulating valve without stopping gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a pressure regulating valve with replaceable cage and a replacement method thereof. BACKGROUND

[0002] Valves for pressure regulating control, from the simplest stop valve to the extremely complex self-control system used in various valves, have a wide variety of types and specifications, and the nominal diameter of the valve ranges from extremely small instrument valves to DN600 main pipeline valves. Natural gas pressure regulating valves (cage type throttling valves) are the main components of the natural gas station pressure regulating system, used to change the direction of gas flow, with pressure control, flow control, stop, throttling and other functions.

[0003] As an important part of the pipeline, the cage of the natural gas pressure regulating valve directly stops and throttles the fluid (at least one of gas, liquid and solid) during long-term use, and the 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 performance of the valve.

[0004] The existing natural gas pressure regulating valve must be shut down for upstream and downstream cutting when replacing the cage, which is not only complicated, but also time-consuming and laborious, and needs to interrupt the gas supply, which will cause great economic loss. SUMMARY

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

[0006] The present application is realized by the following technical solutions:

[0007] In a first aspect, the present application provides a pressure regulating valve with replaceable cage, comprising: a valve body, provided with an inlet cavity and an outlet cavity at a lower part, and provided with an openable pressure regulating cavity at a middle part, the outlet cavity being in communication with the pressure regulating cavity; a valve seat, provided between the inlet cavity and the pressure regulating cavity, and provided with a push spring; a regulating cage, comprising a plurality of cage pieces, the plurality of cage pieces being capable of being combined into a single regulating cage, and each of the cage pieces being detachably connected with the valve seat, and the corresponding push spring being in a compressed state when the cage piece is connected with the valve body; a partition valve, provided at an upper part of the valve body, and separating the pressure regulating cavity from top to bottom into a working cavity and a mounting cavity, the working cavity and the mounting cavity both being capable of accommodating the regulating cage; a linear driving mechanism, provided at the upper part of the valve body, and capable of pressing the cage piece in the mounting cavity to a corresponding position of the valve seat; and a locking mechanism, provided on the valve seat, and capable of fixing the corresponding cage piece on the valve seat.

[0008] The pressure regulating valve with replaceable cage provided by the present application has the valve seat provided between the inlet cavity and the pressure regulating cavity, and provided with a push spring, the regulating cage composed of a plurality of cage pieces, and each of the cage pieces detachably connected with the valve seat, the corresponding push spring being in a compressed state when the cage piece is connected with the valve body, the partition valve provided in the middle part of the valve body, separating the pressure regulating cavity of the valve body from top to bottom into the working cavity and the mounting cavity both capable of accommodating the regulating cage, the linear driving mechanism provided at the upper part of the valve body, capable of pressing the cage piece in the mounting cavity to the corresponding position of the valve seat, and the locking mechanism provided on the valve seat, capable of fixing the corresponding cage piece on the valve seat.

[0009] Under normal working condition, the cage pieces constituting the regulating cage are all mounted on the valve body, and located in the working cavity, and the partition valve is in a closed state, so as to ensure that the pressure regulating valve can work normally. When the regulating cage needs to be replaced, the restriction of the locking mechanism in the valve body on one cage piece is first released, and then the partition valve is opened, so that the released cage piece enters into the mounting cavity under the action of the push spring and the gas pressure in the pipeline; then the partition valve is closed, and the mounting cavity is opened, so as to replace the cage piece in the mounting cavity with a new one; the mounting cavity is closed again, the partition valve is opened, and the new cage piece is pressed into the corresponding position by the linear driving mechanism, and then the new cage piece is locked by the locking mechanism, and the partition valve is closed, so as to complete the replacement of the single cage piece, and the foregoing operation can be repeated to completely replace the used cage pieces.

[0010] In the process of replacing the cage sleeve piece, the working cavity is closed by the partition valve in the state that the installation cavity is opened, so that natural gas is not leaked; and in the process of installing the new cage sleeve piece into the working cavity, the installation cavity is closed, so that a large amount of air is not introduced into the natural gas pipeline, and the safety of natural gas transportation is ensured. Therefore, the pressure regulating valve with the replaceable cage sleeve provided by the application can replace the cage sleeve of the pressure regulating valve without stopping the gas supply, so that the normal gas supply is ensured, and the economic loss caused by stopping the gas supply to replace the natural gas pressure regulating valve is avoided.

[0011] In an embodiment, the lower end of each cage sleeve piece is provided with a clamping protrusion, and one side of the clamping protrusion is provided with a clamping groove; the locking mechanism comprises a linear actuator and a limiting piece, the limiting piece is in transmission connection with the linear actuator, and the limiting piece can be inserted into the clamping groove under the driving of the linear actuator, so that the reliable connection between the cage sleeve piece and the valve seat is ensured, and the cage sleeve piece is facilitated to be detached from the valve seat.

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

[0013] In an optional embodiment, the upper end face of the valve seat is provided with a plurality of installation grooves, the installation grooves are uniformly distributed along the circumference of the valve seat, each clamping protrusion can be inserted into the corresponding installation groove, and the locking mechanism is arranged in the installation groove, so that the locking mechanism is installed in the valve shaft.

[0014] In an optional embodiment, the outer side wall of each cage sleeve piece is provided with a limiting groove, and the limiting groove extends downward from the upper end of the cage sleeve piece; the valve body is provided with a limiting pin, the outer end of the limiting pin is inserted into the valve body, the inner end of the limiting pin extends into the installation cavity, and the inner end of the limiting pin is located on the movement path of the limiting groove, so that the stability of the cage sleeve piece during the upward and downward movement of the cage sleeve piece is ensured, the cage sleeve piece is prevented from being stuck, and the installation of the cage sleeve piece is also ensured.

[0015] In an optional embodiment, the cage sleeve piece is provided with four cage sleeve pieces, so that the installation and replacement are facilitated, and the number of installation and replacement is simplified.

[0016] In an optional embodiment, the valve body is provided with a replacement connector, and the replacement connector is in communication with the installation cavity, so that the gas in the installation cavity is replaced.

[0017] In an optional embodiment, the partition valve is a gate valve, so that the opening degree of the partition valve is ensured, the volume of the partition valve is reduced, and the overall volume of the pressure regulating valve is reduced.

[0018] In a second aspect, the present application provides a method for replacing the cage sleeve of a pressure regulating valve online, based on the pressure regulating valve with replaceable cage sleeve described above, comprising the following steps:

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

[0020] S20, opening the partition valve, so that the released cage sleeve piece enters the installation cavity under the action of the push spring and the gas pressure in the pipeline;

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

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

[0023] S50, locking the new cage sleeve piece through the locking mechanism, and closing the partition valve;

[0024] S60, repeating S10-S50 until all used cage sleeve pieces are completely replaced.

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

[0026] Therefore, the method for replacing the cage sleeve of the pressure regulating valve online provided by the present application realizes the replacement of the cage sleeve of the pressure regulating valve without stopping the gas, 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.

[0027] In an optional embodiment, before opening the partition valve, the gas in the installation cavity is replaced with nitrogen, to prevent the leakage of natural gas in the pipeline, and also to avoid the entry of air into the natural gas pipeline, to ensure the transportation of natural gas.

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

[0029] 1. The pressure regulating valve with replaceable cage provided by the application has a valve seat arranged between the air inlet cavity and the pressure regulating cavity and provided with a pushing spring, the adjusting cage is composed of a plurality of cage pieces, each of which is detachably connected with the valve seat, the corresponding pushing spring is in compression state when the cage pieces are connected with the valve body, a partition valve is arranged in the middle of the valve body to divide the pressure regulating cavity of the valve body into the working cavity and the installation cavity, both of which can accommodate the adjusting cage, a linear driving mechanism is arranged on the upper part of the valve body to press the cage piece in the installation cavity to the corresponding position of the valve seat, and a locking mechanism is arranged on the valve seat to fix the corresponding cage piece on the valve seat, when the adjusting cage needs to be replaced, the locking mechanism in the valve body is first released to limit one cage piece, then the partition valve is opened to make the released cage piece enter the installation cavity under the action of the pushing spring and the gas pressure in the pipeline, then the partition valve is closed and the installation cavity is opened to replace the cage piece in the installation cavity with a new one, then the installation cavity is closed again, the partition valve is opened, the new cage piece is pressed into the corresponding position by the linear driving mechanism, the new cage piece is locked by the locking mechanism, and the partition valve is closed to complete the replacement of the single cage piece, and the foregoing operation is repeated to completely replace the used cage pieces, so that the cage of the pressure regulating valve can be replaced without stopping the gas supply to ensure the normal gas supply of natural gas and avoid economic losses caused by stopping the gas supply to replace the natural gas pressure regulating valve.

[0030] 2. The method for replacing the cage of the pressure regulating valve provided by the application first releases the locking mechanism in the valve body to limit one cage piece, then opens the partition valve to make the released cage piece enter the installation cavity under the action of the pushing spring and the gas pressure in the pipeline, then closes the partition valve and opens the installation cavity to replace the cage piece in the installation cavity with a new one, then closes the installation cavity again, opens the partition valve, presses the new cage piece into the corresponding position by the linear driving mechanism, locks the new cage piece by the locking mechanism, and closes the partition valve to complete the replacement of the single cage piece, and the foregoing operation is repeated to completely replace the used cage pieces, so that the cage of the pressure regulating valve can be replaced without stopping the gas supply to ensure the normal gas supply of natural gas and avoid economic losses caused by stopping the gas supply to replace the natural gas pressure regulating valve. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0032] In the drawings:

[0033] Figure 1 Structure diagram of the pressure regulating valve with replaceable cage of the embodiment of the present application.

[0034] Figure 2 Structure diagram of the cage replacement assembly of the pressure regulating valve with replaceable cage of the embodiment of the present application.

[0035] Figure 3 Structure diagram of the cage and valve seat of the pressure regulating valve with replaceable cage of the embodiment of the present application.

[0036] Figure 4 Structure diagram of the cage and valve seat of the pressure regulating valve with replaceable cage of the embodiment of the present application. Figure 3 Enlarged diagram of part A of the structure diagram.

[0037] Markings in the drawings and corresponding names of parts:

[0038] 10 - valve body, 11 - inlet cavity, 12 - outlet cavity, 13 - pressure regulating cavity, 13a - working cavity, 13b - mounting cavity, 14 - limit pin, 15 - replacement connector;

[0039] 20 - valve seat, 21 - push spring, 22 - mounting groove;

[0040] 30 - regulating cage, 31 - cage piece, 32 - clamping protrusion, 33 - clamping groove, 34 - limit groove;

[0041] 40 - separation valve;

[0042] 50 - linear drive mechanism;

[0043] 60 - locking mechanism, 61 - linear driver, 62 - limit piece;

[0044] 70 - valve core. DETAILED DESCRIPTION

[0045] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of the embodiments. It should be noted that similar labels and letters in the following drawings represent similar items, 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 positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] Meanwhile, the terms "provided", "opened", "mounted", "connected", "linked" should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Embodiment 1

[0049] In combination Figure 1 And Figure 2 The embodiment provides a pressure regulating valve with replaceable cage, comprising: a valve body 10, a lower part provided with an air inlet cavity 11 and an air outlet cavity 12, and a middle part provided with an openable pressure regulating cavity 13 at an upper end, the air outlet cavity 12 being in communication with the regulating cavity; a valve seat 20, arranged between the air inlet cavity 11 and the pressure regulating cavity 13, and provided with a push spring 21; a regulating cage 30, comprising a plurality of cage pieces 31, the plurality of cage pieces 31 being capable of being combined into a single regulating cage 30, and each of the cage pieces 31 being detachably connected with the valve seat 20, the corresponding push spring 21 being in a compressed state in a state that the cage piece 31 is connected with the valve body 10; a partition valve 40, arranged on an upper part of the valve body 10, dividing the pressure regulating cavity 13 from top to bottom into a working cavity 13a and a mounting cavity 13b, the working cavity 13a and the mounting cavity 13b both being capable of accommodating the regulating cage 30; a linear drive mechanism 50, arranged on the upper part of the valve body 10, capable of pressing the cage piece 31 in the mounting cavity 13b to a corresponding position of the valve seat 20; and a locking mechanism 60, arranged on the valve seat 20, capable of fixing the corresponding cage piece 31 on the valve seat 20.

[0050] In combination Figure 3 And Figure 4Specifically, each of the cage sleeve pieces 31 is provided with a clamping protrusion 32 at the lower end, and the clamping protrusion 32 is provided with a clamping groove 33 at one side; the locking mechanism 60 comprises a linear actuator 61 and a limiting piece 62, the limiting piece 62 is in transmission connection with the linear actuator 61, and the limiting piece 62 can be inserted into the clamping groove 33 under the driving of the linear actuator 61, so as to ensure the reliable connection of the cage sleeve piece 31 with the valve seat 20, and facilitate the dismounting of the cage sleeve piece 31 from the valve seat 20.

[0051] In the embodiment, the linear actuator 61 is a servo valve, so that the locking mechanism 60 has a small enough volume, and the installation of the locking mechanism 60 is facilitated. Of course, the limiting piece 62 can also be driven by a linear actuator 61 such as an electromagnet. For the linear driving mechanism 50, a gear and rack mechanism can be used, so as to shorten the height of the pressure regulating valve.

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

[0053] On this basis, each of the outer side walls of the cage sleeve pieces 31 is provided with a limiting groove 34, and the limiting groove 34 extends downward along the upper end of the cage sleeve piece 31; the valve body 10 is provided with a limiting pin 14, the outer end of the limiting pin 14 is inserted into the valve body 10, and the inner end of the limiting pin 14 extends into the mounting cavity 13b, and the inner end of the limiting pin 14 is located on the movement path of the limiting groove 34, so as to ensure the stability of the cage sleeve piece 31 during the upward and downward movement, avoid the cage sleeve piece 31 from being stuck, and also ensure that the cage sleeve piece 31 is installed in place.

[0054] In the embodiment, the cage sleeve piece 31 is provided with four, so as to facilitate the installation and replacement, and simplify the number of installation and replacement. Of course, other combing cage sleeve pieces can also be combined into a single adjusting cage 30.

[0055] In addition, the valve body 10 is provided with a replacement connector 15, and the replacement connector 15 communicates with the mounting cavity 13b, so as to facilitate the replacement of the gas in the mounting cavity 13b. In order to simplify the structure of the pressure regulating valve, the limiting pin 14 and the replacement connector 15 are coaxially arranged.

[0056] Preferably, the partition valve 40 is a gate valve, so as to ensure that the partition valve 40 has enough opening degree, and at the same time, the volume of the partition valve 40 is reduced, and the overall volume of the pressure regulating valve is reduced. It can be understood that in the case that the gate of the partition valve 40 is closed, the rod part of the valve core 70 is sealed and inserted into the middle part of the gate.

[0057] It should be noted that, under normal working condition, the cage sleeve pieces 31 constituting the adjusting cage sleeve 30 are all installed on the valve body 10 and located in the working cavity 13a, and the partition valve 40 is in the closed state, so as to ensure that the pressure regulating valve can work normally. When it is necessary to replace the adjusting cage sleeve 30, the locking mechanism 60 in the valve body 10 is first released from the restriction on one cage sleeve piece 31, and then the partition valve 40 is opened, so that the cage sleeve piece 31 released from the restriction enters the installation cavity 13b under the action of the push spring 21 and the gas pressure in the pipeline; then the partition valve 40 is closed, the installation cavity 13b is opened, and the cage sleeve piece 31 in the installation cavity 13b is replaced with a new one; the installation cavity 13b is closed again, the partition valve 40 is opened, and the new cage sleeve piece 31 is pressed into the corresponding position by the linear driving mechanism 50, and then the new cage sleeve piece 31 is locked by the locking mechanism 60, and the partition valve 40 is closed, so as to complete the replacement of a single cage sleeve piece 31, and the foregoing operation can be repeated to completely replace the used cage sleeve piece 31.

[0058] In the process of replacing the cage sleeve piece 31, the working cavity 13a is closed by the partition valve 40 in the state that the installation cavity 13b is opened, so that natural gas is not leaked; and in the process of installing the new cage sleeve into the working cavity 13a, the installation cavity 13b is closed, so that a large amount of air cannot enter the natural gas pipeline, and the safety of natural gas transportation can be ensured.

[0059] Therefore, the embodiment 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 loss caused by stopping the gas to replace the natural gas pressure regulating valve.

[0060] Embodiment 2

[0061] The embodiment provides a method for replacing the cage sleeve of a pressure regulating valve online, and is based on the pressure regulating valve with replaceable cage sleeve in embodiment 1, and comprises the following steps.

[0062] S10, the locking mechanism 60 in the valve body 10 is released from the restriction on one cage sleeve piece 31.

[0063] Specifically, when the adjusting cage sleeve 30 is replaced, the cage sleeve pieces 31 constituting the adjusting cage sleeve 30 need to be replaced one by one. When installed, nitrogen replacement is performed through the replacement joint 15 on the valve body 10, so as to replace the natural gas or air remaining therein with nitrogen. Of course, other inert gases or gases with good stability can also be used for replacement.

[0064] And the cage piece 31 and the valve body 10 are connected by the form of card card, and each cage piece 31 corresponds to a linear actuator 61 (servo valve), in the normal use of the pressure regulating valve, the servo valve is in the closed state. When the need to replace the adjusting cage 30, the servo valve needs to be input to open the signal, so that the servo valve is in the open state, so that the limiting piece 62 is withdrawn from the card slot 33, so that the cage piece 31 can be separated from the valve body 10.

[0065] S20, open the partition valve 40, so that the released cage piece 31 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 piece 31 is separated from the valve body 10, the gas in the pressure regulating cavity 13 will enter the installation cavity 13b in the open state of the separation valve, therefore, after opening the partition valve 40, the released cage piece 31 can be completely entered into the installation cavity 13b under the action of the push spring 21 and the gas pressure in the pipeline.

[0067] S30, close the partition valve 40, and open the installation cavity 13b, replace the cage piece 31 in the installation cavity 13b with a new one.

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

[0069] S40, close the installation cavity 13b, open the partition valve 40, and press the new cage piece 31 into the corresponding position by the linear drive mechanism 50.

[0070] Specifically, during installation, the linear drive mechanism 50 needs to be drivingly connected with the cage piece 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 partition valve 40 is opened, and the new cage piece 31 is pushed down to the valve seat 20 by the linear drive mechanism 50, so that the card convex 32 is inserted into the corresponding limiting slot 34.

[0071] S50, lock the new cage piece 31 by the locking mechanism 60, and close the partition valve 40.

[0072] That is, the limiting piece 62 is driven by the servo valve to move into the corresponding card slot 33, so that the cage piece 31 is completely engaged with the valve seat 20, and the gas in the safety cavity is replaced with nitrogen after closing the partition valve 40.

[0073] S60, repeat S10-S50 until all used cage sleeve 31 is completely replaced.

[0074] That is, the embodiment first releases the restriction of the locking mechanism 60 in the valve body 10 on one cage sleeve 31, then opens the partition valve 40, so that the released cage sleeve 31 enters the installation cavity 13b under the action of the push spring 21 and the gas pressure in the pipeline; then close the partition valve 40, open the installation cavity 13b, and the cage sleeve 31 in the installation cavity 13b can be replaced with a new one; close the installation cavity 13b again, open the partition valve 40, and press the new cage sleeve 31 into the corresponding position through the linear drive mechanism 50, then lock the new cage sleeve 31 through the locking mechanism 60, and close the partition valve 40, to complete the replacement of a single cage sleeve 31, and repeat the above operation to completely replace the used cage sleeve 31.

[0075] Wherein, before opening the partition valve 40, the gas in the installation cavity 13b is replaced with nitrogen, which can prevent natural gas leakage in the pipeline, and also can avoid air entering the natural gas pipeline, ensuring the delivery of natural gas.

[0076] Therefore, the method for online replacement of the cage sleeve of the pressure regulating valve provided by the embodiment realizes the replacement of 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 loss caused by stopping the gas to replace the natural gas pressure regulating valve.

[0077] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure regulating valve with a replaceable cage, characterized in that, The valve body (10) is provided with an air inlet cavity (11) and an air outlet cavity (12) at the lower part, and is provided with an upper end openable pressure regulating cavity (13) at the middle part, and the air outlet cavity (12) is communicated with the pressure regulating cavity (13); The valve seat (20) is arranged between the air inlet cavity (11) and the pressure regulating cavity (13), and is provided with a push spring (21); The adjusting cage (30) comprises a plurality of cage pieces (31), and the plurality of cage pieces (31) can be combined into a single adjusting cage (30), and each cage piece (31) is detachably connected with the valve seat (20), and the corresponding push spring (21) is in a compressed state when the cage piece (31) is connected with the valve body (10); The partition valve (40) is arranged on the upper part of the valve body (10), and the pressure regulating cavity (13) is divided into a working cavity (13a) and a mounting cavity (13b) from top to bottom, and the working cavity (13a) and the mounting cavity (13b) can accommodate the adjusting cage (30); The linear drive mechanism (50) is arranged on the upper part of the valve body (10), and can press the cage piece (31) in the mounting cavity (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 piece (31) on the valve seat (20); Each cage piece (31) is provided with a clamping protrusion (32) at the lower end, and the clamping protrusion (32) is provided with a clamping groove (33) on one side; The locking mechanism (60) comprises a linear drive (61) and a limiting piece (62), and the limiting piece (62) is drivingly connected with the linear drive (61), and the limiting piece (62) can be inserted into the clamping groove (33) under the driving of the linear drive (61); 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 uniformly distributed along the circumference of the valve seat (20), and each clamping protrusion (32) can be inserted into the corresponding mounting groove (22), and the locking mechanism (60) is arranged in the mounting groove (22). The linear drive (61) is a servo valve.

2. The pressure regulating valve with an online replaceable cage according to claim 1, characterized in that, Each cage piece (31) is provided with a limiting groove (34) on the outer side wall, and the limiting groove (34) extends downward along the upper end of the cage piece (31); 3. The replaceable cage liner pressure regulating valve of claim 1, wherein, The valve body (10) is provided with a limiting pin (14), and the outer end of the limiting pin (14) is inserted into the valve body (10), and the inner end of the limiting pin (14) extends into the mounting cavity (13b), and the inner end of the limiting pin (14) is located on the movement path of the limiting groove (34). The cage piece (31) is provided with four.

4. The replaceable cage liner pressure regulating valve of claim 1, wherein, The valve body (10) is provided with a replacement connector (15), and the replacement connector (15) is communicated with the mounting cavity (13b).

5. The replaceable cage liner pressure regulating valve of claim 1, wherein, The partition valve (40) is a gate valve.

6. The replaceable cage liner pressure regulating valve of claim 1, wherein, The pressure regulating valve with replaceable cage based on any one of claims 1-6 comprises the following steps:

7. A method of replacing a pressure regulating valve cage online, characterized by, S10, release the restriction of the locking mechanism (60) in the valve body (10) on one cage piece (31). ​ S20, open the partition valve (40), so that the released cage sleeve body (31) enters the installation cavity (13b) under the action of the push spring (21) and the pipeline gas pressure; S30, close the partition valve (40) and open the installation cavity (13b), replace the cage sleeve body (31) in the installation cavity (13b) with a new one; S40, close the installation cavity (13b), open the partition valve (40), and press the new cage sleeve body (31) into the corresponding position through the linear drive mechanism (50); S50, lock the new cage sleeve body (31) through the locking mechanism (60), and close the partition valve (40); S60, repeat S10-S50 until all used cage sleeve bodies (31) are completely replaced.

8. The method of claim 7, wherein, Before opening the partition valve (40), the gas in the installation cavity (13b) is replaced with nitrogen.

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