An on-line maintenance flow and pressure regulating valve group

Abstract

The present invention discloses an on-line maintenance flow-regulating and pressure-regulating valve, belonging to the technical field of valve applications. It includes a first connecting pipeline and a second connecting pipeline. A flow-regulating and pressure-regulating valve is arranged between the first connecting pipeline and the second connecting pipeline, and the flow-regulating and pressure-regulating valve is used to connect or cut off the first connecting pipeline and the second connecting pipeline; a pre-valve maintenance valve is arranged at the front end of the first connecting pipeline, and the pre-valve maintenance valve is used to control the on-off of the first connecting pipeline. A post-valve maintenance valve is arranged at the rear end of the second connecting pipeline, and the post-valve maintenance valve is used to control the on-off of the second connecting pipeline. An overpressure relief valve group is also arranged above the pre-valve maintenance valve, and an exhaust and air-compensating valve group is arranged above the post-valve maintenance valve. The on-line maintenance flow-regulating and pressure-regulating valve provided by the present invention can realize the instant pressure relief of the pipeline, and at the same time exhaust or supplement air to the pipeline, which is convenient for maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve applications, and more specifically, relates to an on-line maintenance flow and pressure regulating valve group. Background Art

[0002] The flow and pressure regulating valve changes the opening degree of the strip-shaped flow-limiting holes on the flow-limiting cover through the movement of the piston, so as to realize the functions of flow regulation, pressure regulation and cavitation elimination under high pressure difference. It is found in actual use that when the pressure in front of the flow and pressure regulating valve suddenly rises, the pressure relief through the flow and pressure regulating valve is slow, and instantaneous pressure relief cannot be achieved, which cannot protect the safety of pipelines and valves; in addition, the flow and pressure regulating valve is prone to form a negative pressure area under high flow rates, and only through the flow and pressure regulating valve, air cannot be replenished in time, and the pipeline is prone to damage under the action of negative pressure; in addition, changing the opening degree of the strip-shaped flow-limiting holes can eliminate cavitation, but the gas is still dissolved in the medium and cannot be discharged in time, and destructive water hammer is likely to occur in the pipeline; at the same time, after the flow and pressure regulating valve operates for a period of time, it is necessary to clean the accumulated garbage in the flow and pressure regulating valve. If it is not cleaned in time, there is a risk of blocking the piston orifice. The existing flow and pressure regulating valves cannot be directly maintained, and the whole flow and pressure regulating valve needs to be disassembled and assembled, which is not easy to maintain. Summary of the Invention

[0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide an on-line maintenance flow and pressure regulating valve group, aiming to solve the problems that the existing flow and pressure regulating valves cannot relieve pressure instantaneously, cannot replenish and exhaust air in time, and are not easy to maintain.

[0004] To achieve the above purpose, the present invention provides an on-line maintenance flow and pressure regulating valve, which includes a first connecting pipeline and a second connecting pipeline. A flow and pressure regulating valve is arranged between the first connecting pipeline and the second connecting pipeline. The flow and pressure regulating valve is used to connect or cut off the first connecting pipeline and the second connecting pipeline; a pre-valve maintenance valve is arranged at the front end of the first connecting pipeline, and the pre-valve maintenance valve is used to control the on-off of the first connecting pipeline. A post-valve maintenance valve is arranged at the rear end of the second connecting pipeline, and the post-valve maintenance valve is used to control the on-off of the second connecting pipeline. An overpressure relief valve group is also arranged above the pre-valve maintenance valve, and an exhaust and air replenishment valve group is arranged above the post-valve maintenance valve.

[0005] Furthermore, both the pre-valve maintenance valve and the post-valve maintenance valve are eccentric semi-spherical valves. The pre-valve maintenance valve includes a valve body, and a detachable valve cover is arranged above the valve body. A valve cavity is formed by assembling and connecting between the valve body and the valve cover through a sealing member. An inlet and an outlet are arranged at both ends of the valve cavity. An elastic valve seat is arranged in the inlet or the outlet. A valve core assembly is arranged in the valve cavity. The valve core assembly can rotate to seal the elastic valve seat, and a connection port is arranged above the valve cover.

[0006] Furthermore, the flow and pressure regulating valve includes an installation valve body. The two ends of the installation valve body are respectively provided with a first port and a second port. A flow guide cover is arranged inside the installation valve body. A link transmission mechanism is arranged inside the flow guide cover. The output end of the link transmission mechanism is connected with a piston. A guide rail is further arranged on the inner wall of the flow guide cover. The outer wall of the piston is arranged in a manner that fits the inner wall of the guide rail. A current-limiting cover is arranged at the end of the piston. Strip-shaped current-limiting holes are circumferentially and evenly distributed on the outer wall of the current-limiting cover.

[0007] Furthermore, a stepped surface is provided on the second port. A limit cover plate for the piston to move to the extreme right position is arranged on the stepped surface. A first clamping groove is formed on the second port. A second clamping groove is arranged on the limit cover plate. An installation groove for installing a T-shaped sealing member is formed by the cooperation between the first clamping groove and the second clamping groove. The T-shaped sealing member is used for sealing with the outer wall of the piston.

[0008] Furthermore, the link transmission mechanism includes a rotating shaft. A swing arm is installed on the rotating shaft. A connecting rod is hinged to the end of the swing arm. The end of the connecting rod is hinged to the piston. When the rotating shaft rotates, it drives the swing arm to rotate. The swing arm drives the connecting rod to push and pull the piston to move.

[0009] Furthermore, a pre-valve pressure gauge and a pre-valve sensor are arranged on the first connecting pipeline. The overpressure relief valve group includes a first connecting pipe seat. A first valve is arranged above the first connecting pipe seat. An overpressure relief valve is arranged above the first valve.

[0010] Furthermore, a compensation joint is further arranged between the second connecting pipeline and the flow and pressure regulating valve. A post-valve pressure gauge and a post-valve sensor are also arranged on the second connecting pipeline. The exhaust and air supply valve group includes a second connecting pipe seat. A second valve is arranged above the second connecting pipe seat. An air valve is arranged above the second valve.

[0011] Furthermore, a drain ball valve is also arranged at the bottom of the second pipeline.

[0012] Furthermore, a backwashing air valve is also arranged on the side wall of the air valve.

[0013] Furthermore, a limit groove is arranged on the inner wall of the valve cavity. The elastic valve seat includes a valve seat main body. A spring is arranged between the valve seat main body and the end face of the limit groove. A limit pin for cooperating with the limit groove is arranged radially on the side wall of the valve seat main body.

[0014] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the following beneficial effects are achieved:

[0015] (1) The online maintenance flow - regulating and pressure - regulating valve group provided by the present invention is equipped with an over - pressure relief valve group on the pre - valve maintenance valve. When the pressure before the flow - regulating and pressure - regulating valve suddenly rises and reaches the set value of the over - pressure relief valve group, the over - pressure relief valve instantaneously opens to relieve pressure, protecting the safety of pipelines and valves;

[0016] (2) In addition, an exhaust and air - supplementing valve group is installed on the post - valve maintenance valve. When the medium is first filled into the pipeline, the medium flows in from the pre - valve maintenance valve and out from the post - valve maintenance valve, and a large amount of gas in the pipeline can be discharged. When a small amount of gas is generated during the normal operation of the pipeline, it can be discharged through the exhaust and air - supplementing valve group to protect the safety of the pipeline. In addition, when a negative pressure area is formed at high flow rates by the flow - regulating and pressure - regulating valve, the pipeline can be timely supplemented with air through the exhaust and air - supplementing valve group to protect the safety of the pipeline;

[0017] (3) Additionally, after the flow - regulating and pressure - regulating valve has been operating for a period of time, it is necessary to clean the accumulated garbage inside the flow - regulating and pressure - regulating valve. Since both the pre - valve maintenance valve and the post - valve maintenance valve adopt eccentric semi - spherical valves, the unique horizontal - axis structure of the eccentric semi - spherical valve allows the valve cover to be opened when the valve is closed, enabling personnel to easily enter the pipeline to perform on - line maintenance of the flow - regulating and pressure - regulating valve inside the pipeline without disassembling and assembling the flow - regulating and pressure - regulating valve, which is convenient for maintenance;

[0018] (4) Moreover, a back - flushing air valve is provided on the side wall of the air valve, which can clean the air valve in a timely manner to improve the exhaust and air - supplementing effect of the air valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the structural schematic diagram of the online maintenance flow - regulating and pressure - regulating valve group provided by the present invention;

[0020] Figure 2 is the structural schematic diagram of the flow - regulating and pressure - regulating valve of the online maintenance flow - regulating and pressure - regulating valve group provided by the present invention;

[0021] Figure 3 is Figure 2 the partial enlarged view at A in

[0022] Figure 4 is the structural schematic diagram of the pre - valve maintenance valve of the online maintenance flow - regulating and pressure - regulating valve group provided by the present invention;

[0023] Figure 5 is the structural schematic diagram of the over - pressure relief valve of the online maintenance flow - regulating and pressure - regulating valve group provided by the present invention;

[0024] Figure 6 is Figure 4 the partial enlarged view at B in

[0025] Figure 7 is Figure 4 the partial enlarged view at C in

[0026] Figure 8 It is a schematic structural diagram of the air valve of the online maintenance flow-regulating and pressure-regulating valve group provided by the present invention.

[0027] The structures corresponding to the respective numerical markings in the accompanying drawings are as follows: 1 - First connecting pipeline, 2 - Second connecting pipeline, 3 - Flow-regulating and pressure-regulating valve, 31 - Installation valve body, 32 - First port, 33 - Second port, 331 - Step surface, 332 - T-shaped seal, 34 - Flow guide cover, 35 - Link transmission mechanism, 351 - Rotating shaft, 352 - Swing arm, 353 - Link, 36 - Piston, 37 - Guide rail, 38 - Flow-limiting cover, 381 - Strip-shaped flow-limiting hole, 39 - Limit cover plate, 4 - Pre-valve maintenance valve, 41 - Valve body, 42 - Valve cover, 43 - Valve cavity, 44 - Inlet, 45 - Outlet, 46 - Elastic valve seat, 461 - Valve seat main body, 462 - Spring, 463 - Limit pin, 47 - Spool assembly, 471 - Valve stem, 472 - Sealing seat, 473 - Cover plate, 474 - Sealing gasket, 48 - Connection port, 49 - Limit groove, 5 - Post-valve maintenance valve, 6 - Overpressure relief valve group, 61 - First connection pipe seat, 62 - First valve, 63 - Overpressure relief valve, 631 - Relief valve body, 632 - Relief valve cavity, 633 - Relief valve seat, 634 - Relief outlet, 635 - Piston cylinder, 636 - Sealing piston, 637 - Flexible sealing ring, 638 - Pressing plate, 639 - Compression spring, 7 - Exhaust and air supply valve group, 71 - Second connection pipe seat, 72 - Second valve, 73 - Air valve, 731 - Installation base, 732 - Drain valve, 733 - Air valve body, 734 - Air valve cavity, 735 - Support seat, 736 - Floating ball, 737 - Top cover, 738 - Exhaust cover, 74 - Backwashing air valve, 741 - First interface, 742 - Second interface, 743 - Exhaust valve, 744 - Filter, 745 - Connection hose, 746 - Valve, 8 - Pre-valve pressure gauge, 9 - Pre-valve sensor, 10 - Compensation joint, 11 - Post-valve pressure gauge, 12 - Post-valve sensor, 13 - Drainage ball valve. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Refer to Figures 1 to 8, the present invention provides an on-line maintenance flow and pressure regulating valve group, which can realize the rapid pressure relief of the pipeline and perform exhaust and air replenishment, facilitating on-line maintenance. It includes: a first connecting pipeline 1 and a second connecting pipeline 2. A flow and pressure regulating valve 3 is provided between the first connecting pipeline 1 and the second connecting pipeline 2. The flow and pressure regulating valve 3 is used to connect or cut off the first connecting pipeline 1 and the second connecting pipeline 2. To facilitate the maintenance of the pipeline, a pre-valve maintenance valve 4 is provided at the front end of the first connecting pipeline 1. The pre-valve maintenance valve 4 is used to control the on-off of the first connecting pipeline 1. A post-valve maintenance valve 5 is provided at the rear end of the second connecting pipeline 2. The post-valve maintenance valve 5 is used to control the on-off of the second connecting pipeline 2. To achieve the rapid pressure relief of the pipeline, a super-pressure relief valve group 6 is further provided above the pre-valve maintenance valve 4. To exhaust and replenish air to the pipeline, an exhaust and air replenishment valve group 7 is provided above the post-valve maintenance valve 5. As Figure 1 shown, the fluid medium flows in from the pre-valve maintenance valve 4, passes through the first connecting pipeline 1 and the flow and pressure regulating valve 3 in sequence, and finally flows out from the post-valve maintenance valve 5. The following will describe each component in detail with specific embodiments.

[0030] Further, for the convenience of maintenance, in this embodiment, both the pre-valve maintenance valve 4 and the post-valve maintenance valve 5 are eccentric hemisphere valves. The unique horizontal axis structure of the eccentric hemisphere valve can open the valve cover when closing the valve, and personnel can easily enter the pipeline to perform on-line maintenance of the flow and pressure regulating valve in the pipeline without disassembling and assembling the flow and pressure regulating valve, which is convenient for maintenance. Specifically, as Figure 4 shown, the pre-valve maintenance valve 4 includes a valve body 41. A detachable valve cover 42 is provided above the valve body 41. A valve cavity 43 is formed by assembling and connecting between the valve body 41 and the valve cover 42 through a sealing member. The sealing member is generally made of materials such as rubber or silica gel to improve the sealing performance of the valve cavity 43. An inlet 44 and an outlet 45 are provided at both ends of the valve cavity 43. An elastic valve seat 46 is provided in the inlet 44 or the outlet. In this embodiment, an elastic valve seat is provided at the inlet of the pre-valve maintenance valve 4, and an elastic valve seat is provided at the outlet of the post-valve maintenance valve 5. To seal the elastic valve seat 46, a valve core assembly 47 is provided in the valve cavity 43. When the valve core assembly 47 rotates, it can seal the elastic valve seat 46. The use of the elastic valve seat 46 can improve the overall sealing effect of the valve. Further, to facilitate the connection with the super-pressure relief valve group 6 or the exhaust and air replenishment valve group 7, a connection port 48 is provided above the valve cover 42.

[0031] Specifically, for the convenience of the installation and limitation of the elastic valve seat 46, as Figure 6 、 Figure 7As shown in the figure, a limiting groove 49 is provided on the inner wall of the valve cavity 43. The elastic valve seat 46 includes a valve seat body 461. Sealing rings are evenly distributed on the outer wall of the valve seat body 461 to improve the sealing effect. At the same time, a spring 462 is provided between the valve seat body 461 and the end face of the limiting groove 49. The spring 462 has a tendency to push the valve seat body 461 to move axially. To facilitate the limiting of the valve seat body 461 during axial movement sealing, a limiting pin 463 that cooperates with the limiting groove 49 is provided radially on the side wall of the valve seat body 461. The limiting pin 463 is clamped in the limiting groove 49 to limit the axial movement of the valve seat body 461. Further, the valve core assembly 47 includes a valve rod 471. A sealing seat 472 is provided on the valve rod 471. A cover plate 473 is also provided on the sealing seat 472. A sealing gasket 474 is clamped between the sealing seat 472 and the cover plate 473. The sealing gasket 474 is used to contact and seal with the valve seat body 461.

[0032] The flow regulating and pressure regulating valve 3 can control the on-off between the first connecting pipeline 1 and the second connecting pipeline 2, and at the same time adjust the flow rate in the pipeline. For example, Figure 2 As shown in the figure, it includes an installation valve body 31. A first port 32 and a second port 33 are respectively provided at both ends of the installation valve body 31. The medium flows in through the first port 32 and flows out from the second port 33. A flow guide cover 34 is provided inside the installation valve body 31. The flow guide cover 34 is used for guiding the medium during flow. A link transmission mechanism 35 is provided inside the flow guide cover 34. The output end of the link transmission mechanism 35 is connected to a piston 36. In order to limit the movement of the piston, a guide rail 37 is also provided on the inner wall of the flow guide cover 34. The outer wall of the piston 36 is arranged in contact with the inner wall of the guide rail 37. A flow limiting cover 38 is provided at the end of the piston 36. Strip-shaped flow limiting holes 381 are evenly distributed circumferentially on the outer wall of the flow limiting cover 38. The piston 36 moves linearly along the guide rail 37 to open and close the second port 33. At the same time, by adjusting the opening degree between the strip-shaped flow limiting holes 381 and the second port 33, the flow rate of the entire pipeline is further adjusted.

[0033] In order to improve the sealing effect when the second port 33 is closed, as Figure 2 shown in the figure, that is, when the piston 36 moves to the right extreme position, the second port 33 is completely closed. Therefore, a stepped surface 331 is provided on the second port 33. A limiting cover plate 39 for the piston 36 to move to the right extreme position is provided on the stepped surface 331. A first clamping groove is opened on the second port 33. A second clamping groove is provided on the limiting cover plate 39. An installation groove for installing a T-shaped sealing member 332 is formed by the cooperation between the first clamping groove and the second clamping groove. The T-shaped sealing member 332 is used to seal with the outer wall of the piston 36.

[0034] The link transmission mechanism 35 is used to drive the piston 36 to reciprocate. For example, Figure 2As shown, it includes a rotating shaft 351, a swing arm 352 is installed on the rotating shaft 351, the end of the swing arm 352 is hinged with a connecting rod 353, the end of the connecting rod 353 is hinged to the piston 36, when the rotating shaft 351 rotates, it drives the swing arm 352 to rotate, and the swing arm 352 drives the connecting rod 353 to push and pull the piston 36 to move.

[0035] In order to facilitate observation of the pressure in the first connecting pipeline 1, a pre-valve pressure gauge 8 and a pre-valve sensor 9 are provided on the first connecting pipeline 1. The overpressure relief valve group 6 includes a first connecting pipe seat 61. A first valve 62 is provided above the first connecting pipe seat 61. An overpressure relief valve 63 is provided above the first valve 62. The first valve 62 is in a normally open state and is used to connect the pre-valve inspection valve 4 and the overpressure relief valve 63. The overpressure relief valve 63 is preset with a pressure value according to the pre-valve pressure gauge 8 and the pre-valve sensor 9. When overpressure occurs, the overpressure relief valve 63 is opened to achieve instantaneous pressure relief. Specifically, Figure 5 As shown, the overpressure relief valve 63 includes a relief valve body 631, a relief valve cavity 632 is provided in the relief valve body 631, a relief valve seat 633 and a relief outlet 634 are provided in the relief valve cavity 632, and a piston cylinder 635 is coaxially provided above the relief valve seat 633, a resilient valve core assembly is coaxially provided in the piston cylinder 635, and the resilient valve core assembly includes a sealing piston 636, a flexible sealing ring 637 for sealing the relief valve seat 633 is provided at the lower end of the sealing piston 636, and the flexible sealing ring 637 is fixed to the end of the sealing piston 636 by a pressure plate 638. A compression spring 639 is also provided in 636, one end of the compression spring 639 is against the inner wall of the pressure relief valve body 631, and the other end is against the sealing piston 636. The compression spring 639 has a tendency to drive the sealing piston 636 to seal the pressure relief valve seat 633; when the pressure in the pipeline is at a normal value, the pressure relief valve seat 633 is in a sealed state. When the pressure in the pipeline exceeds the pressure, the sealing piston 636 compresses the compression spring 639 under the action of the medium pressure, the sealing valve seat 633 opens, and the medium flows out from the pressure relief outlet 634 through the sealing valve seat 633, thereby realizing rapid pressure relief of the pipeline.

[0036] In order to facilitate the connection between the second connecting pipeline 2 and the flow regulating and pressure regulating valve 3, a compensation joint 10 is further provided between the second connecting pipeline 2 and the flow regulating and pressure regulating valve 3. A valve rear pressure gauge 11 and a valve rear sensor 12 are also provided on the second connecting pipeline 2. The exhaust and air supply valve group 7 includes a second connecting pipe seat 71. The second connecting pipe seat 71 is directly connected to the connecting port on the valve rear inspection valve 5. A second valve 72 is provided above the second connecting pipe seat 71. The second valve 72 is also in a normally open state. An air valve 73 is provided above the second valve 72. Figure 8As shown, the air valve 73 includes a mounting base 731 located at the upper end of the second valve 72, and a drain valve 732 is provided on the side wall of the mounting base 731. At the same time, an air valve body 733 is provided at the upper end of the mounting base 731, and an air valve cavity 734 is provided inside the air valve body 733. A support seat 735 and a float 736 are provided in the air valve cavity 734. A top cover 737 is provided at the upper end of the air valve body 733, and an exhaust port is provided on the top cover 737. An exhaust cover 738 is provided above the exhaust port. The float 736 can open and close the exhaust port by moving up and down, thereby realizing air replenishment or exhaust.

[0037] Since the air valve 73 is prone to absorb impurities during the process of replenishing or exhausting air, in order to facilitate cleaning of the air valve, a backwash air valve 74 is further provided on the side wall of the air valve 73. Figure 8 As shown, the backwash air valve 74 is provided with a first interface 741 and a second interface 742, wherein the first interface 741 is connected to the air valve cavity 734 of the air valve 73, and the second interface 742 is connected to the second connecting seat 71. It also includes an exhaust valve 743. To prevent the exhaust valve from being contaminated, a filter 744 is provided at the bottom of the exhaust valve 743, and a connecting hose 745 connected to both the first interface 741 and the second interface 742 is provided below the filter 744. In order to facilitate the control of the on-off of the first interface 741 and the second interface 742, a valve 746 is provided on the connecting hose 745. When backwashing is performed, the second valve 72 is closed, and the medium enters the air valve cavity 734 through the second interface 742, the connecting hose 745, the first interface 741 and the second interface 742, and is discharged from the drain valve 732 after repeated flushing.

[0038] When using the online maintenance flow regulating and pressure regulating valve group provided by the present invention, it can be directly connected to the pipeline. When the pipeline is filled with medium for the first time, the medium flows in through the valve front inspection valve 4 and flows out from the valve rear inspection valve 5, which can quickly discharge the gas in the pipeline; when the pipeline is normally operated, the trace gas generated can be discharged through the exhaust and air supply valve group to protect the safety of the pipeline. In addition, when the flow regulating and pressure regulating valve forms a negative pressure area at a high flow rate, the exhaust and air supply valve group can be used to replenish the pipeline in time to protect the safety of the pipeline; it can achieve rapid discharge of the pipeline. Pressure, exhaust and air supply, by adjusting the flow regulating and pressure regulating valve, the flow size and on-off of the entire pipeline can be controlled. When maintaining the flow regulating and pressure regulating valve, in order to quickly discharge the medium in the entire valve group, a drainage ball valve 13 is also provided at the bottom of the second pipeline 2. At the same time, the valve before the valve and the valve after the valve are both eccentric semi-ball valves. When performing maintenance, the valve can be closed and the valve cover opened. Personnel can easily enter the pipeline and maintain the flow regulating and pressure regulating valve online in the pipeline without disassembling the flow regulating and pressure regulating valve, which is convenient for maintenance.

[0039] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An on-line maintenance flow and pressure regulating valve group, characterized in that: It includes a first connecting pipeline (1) and a second connecting pipeline (2). A flow regulating and pressure regulating valve (3) is provided between the first connecting pipeline (1) and the second connecting pipeline (2). The flow regulating and pressure regulating valve (3) is used to connect or cut off the first connecting pipeline (1) and the second connecting pipeline (2); a pre-valve maintenance valve (4) is provided at the front end of the first connecting pipeline (1), and the pre-valve maintenance valve (4) is used to control the on-off of the first connecting pipeline (1). A post-valve maintenance valve (5) is provided at the rear end of the second connecting pipeline (2), and the post-valve maintenance valve (5) is used to control the on-off of the second connecting pipeline (2). An overpressure relief valve group (6) is also provided above the pre-valve maintenance valve (4), and an exhaust and air supplement valve group (7) is provided above the post-valve maintenance valve (5).

2. The online maintenance flow and pressure regulating valve group according to claim 1, wherein: Both the pre-valve maintenance valve (4) and the post-valve maintenance valve (5) are eccentric semi-spherical valves. The pre-valve maintenance valve (4) includes a valve body (41). A detachable valve cover (42) is provided above the valve body (41). A valve cavity (43) is formed by assembling and connecting between the valve body (41) and the valve cover (42) through a sealing member. An inlet (44) and an outlet (45) are provided at both ends of the valve cavity (43). An elastic valve seat (46) is provided in the inlet (44) or the outlet. A valve core assembly (47) is provided in the valve cavity (43). The valve core assembly (47) can rotate to seal the elastic valve seat (46). A connection port (48) is provided above the valve cover (42).

3. The online maintenance flow and pressure regulating valve group according to claim 1, characterized in that: The flow regulating and pressure regulating valve (3) includes an installation valve body (31). A first port (32) and a second port (33) are respectively provided at both ends of the installation valve body (31). A flow guide cover (34) is provided inside the installation valve body (31). A connecting rod transmission mechanism (35) is provided inside the flow guide cover (34). The output end of the connecting rod transmission mechanism (35) is connected with a piston (36). A guide rail (37) is also provided on the inner wall of the flow guide cover (34). The outer wall of the piston (36) is arranged in contact with the inner wall of the guide rail (37). A current limiting cover (38) is provided at the end of the piston (36). Strip-shaped current limiting holes (381) are evenly distributed in the circumferential direction on the outer wall of the current limiting cover (38).

4. The online maintenance flow and pressure regulating valve group according to claim 3, characterized in that: A step surface (331) is provided on the second port (33). A limit cover plate (39) for the piston (36) to move to the extreme right position is provided on the step surface (331). A first card slot is opened on the second port (33). A second card slot is provided on the limit cover plate (39). An installation slot for installing a T-shaped seal (332) is formed by the cooperation between the first card slot and the second card slot. The T-shaped seal (332) is used to seal the outer wall of the piston (36).

5. The online maintenance flow and pressure regulating valve group according to claim 3, characterized in that: The link transmission mechanism (35) includes a rotating shaft (351), on which a swing arm (352) is installed. One end of the swing arm (352) is hinged with a connecting rod (353), and one end of the connecting rod (353) is hinged with the piston (36). When the rotating shaft (351) rotates, it drives the swing arm (352) to rotate, and the swing arm (352) drives the connecting rod (353) to push and pull the piston (36) to move.

6. The online maintenance flow and pressure regulating valve group according to claim 1, wherein: A pressure gauge before the valve (8) and a sensor before the valve (9) are provided on the first connecting pipeline (1). The overpressure relief valve group (6) includes a first connecting pipe seat (61), a first valve (62) is arranged above the first connecting pipe seat (61), and an overpressure relief valve (63) is arranged above the first valve (62).

7. The online maintenance flow-regulating and pressure-regulating valve group according to claim 1, wherein: A compensating joint (10) is further provided between the second connecting pipeline (2) and the flow regulating and pressure regulating valve (3). A pressure gauge after the valve (11) and a sensor after the valve (12) are also provided on the second connecting pipeline (2). The exhaust and air replenishing valve group (7) includes a second connecting pipe seat (71), a second valve (72) is arranged above the second connecting pipe seat (71), and an air valve (73) is arranged above the second valve (72).

8. The online maintenance adjustable flow and pressure regulating valve group according to claim 1, wherein: A drain ball valve (13) is further provided at the bottom of the second connecting pipeline (2).

9. The online maintenance flow and pressure regulating valve group according to claim 7, characterized in that: A backwashing air valve (74) is further provided on the side wall of the air valve (73).

10. The online maintenance flow and pressure regulating valve group according to claim 2, characterized in that: A limiting groove (49) is provided on the inner wall of the valve cavity (43). The elastic valve seat (46) includes a valve seat body (461). A spring (462) is provided between the valve seat body (461) and the end face of the limiting groove (49). A limiting pin (463) that cooperates with the limiting groove (49) is arranged radially on the side wall of the valve seat body (461).

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