CN219102195U

CN219102195U - On-line maintenance flow-regulating pressure regulating valve set

Info

Publication number: CN219102195U
Application number: CN202223597479.0U
Authority: CN
Inventors: 韩安伟; 胡玉平
Original assignee: Anhui Redstar Valve Co Ltd
Current assignee: Anhui Redstar Valve Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-30
Anticipated expiration: 2032-12-30

Abstract

The utility model discloses an online maintenance flow regulating and pressure regulating valve group, which belongs to the technical field of valve application and comprises a first connecting pipeline and a second connecting pipeline, wherein a flow regulating and pressure regulating valve is arranged between the first connecting pipeline and the second connecting pipeline and is used for communicating or blocking the first connecting pipeline and the second connecting pipeline; the front end of the first connecting pipeline is provided with a valve front maintenance valve which is used for controlling the on-off of the first connecting pipeline, the rear end of the second connecting pipeline is provided with a valve rear maintenance valve which is used for controlling the on-off of the second connecting pipeline, an overpressure relief valve group is further arranged above the valve front maintenance valve, and an exhaust and air supplementing valve group is arranged above the valve rear maintenance valve. The online maintenance flow regulating and regulating valve provided by the utility model can realize instant pressure relief of the pipeline, and simultaneously exhaust or supplement air to the pipeline, thereby being convenient for maintenance.

Description

On-line maintenance flow-regulating pressure regulating valve set

Technical Field

The utility model belongs to the technical field of valve application, and particularly relates to an online maintenance flow-regulating and pressure-regulating valve group.

Background

The flow regulating and pressure regulating valve changes the opening of the strip-shaped flow limiting hole on the flow limiting cover through the movement of the piston, so that the functions of regulating flow and pressure under high pressure difference and eliminating cavitation are realized, and in actual use, the fact that when the pressure in front of the flow regulating and pressure regulating valve suddenly rises, the pressure release through the flow regulating and pressure regulating valve is slower, the instant pressure release cannot be realized, and the safety of a pipeline and a valve is protected; in addition, the flow regulating and pressure regulating valve is easy to form a negative pressure area under high flow velocity, the air cannot be timely supplemented only through the flow regulating and pressure regulating valve, and a pipeline is easy to damage under the action of negative pressure; in addition, cavitation can be eliminated by changing the opening of the strip-shaped limiting hole, but gas is still dissolved in a medium and cannot be discharged in time, and destructive water hammer is easy to generate in a pipeline; meanwhile, after the flow regulating and pressure regulating valve runs for a period of time, the garbage accumulated in the flow regulating and pressure regulating valve needs to be cleaned, if the risk of blocking a piston orifice is not timely cleaned, the existing flow regulating and pressure regulating valve cannot be directly maintained, the whole flow regulating and pressure regulating valve needs to be disassembled and assembled, and the maintenance is difficult.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide an online maintenance flow regulating and pressure regulating valve group, and aims to solve the problems that in the prior art, a flow regulating and pressure regulating valve cannot be instantaneously depressurized, cannot timely supplement and exhaust air and is difficult to maintain.

In order to achieve the above purpose, the utility model provides an online maintenance flow regulating and pressure regulating valve, which comprises a first connecting pipeline and a second connecting pipeline, wherein a flow regulating and pressure regulating valve is arranged between the first connecting pipeline and the second connecting pipeline and is used for communicating or cutting off the first connecting pipeline and the second connecting pipeline; the front end of the first connecting pipeline is provided with a valve front maintenance valve which is used for controlling the on-off of the first connecting pipeline, the rear end of the second connecting pipeline is provided with a valve rear maintenance valve which is used for controlling the on-off of the second connecting pipeline, an overpressure relief valve group is further arranged above the valve front maintenance valve, and an exhaust and air supplementing valve group is arranged above the valve rear maintenance valve.

Still further, before the valve maintenance valve with after the valve maintenance valve is eccentric half ball valve, before the valve maintenance valve is including the valve body, the valve body top is equipped with detachable valve gap, the valve body with form the valve pocket through sealing member assembly connection between the valve gap, the valve pocket both ends are equipped with import and export, the import or be equipped with the elasticity disk seat in the export, be equipped with the case subassembly in the valve pocket, case subassembly rotation sealable the elasticity disk seat, the valve gap top is equipped with the connector.

Still further, the flow regulating and regulating valve comprises a mounting valve body, a first port and a second port are respectively arranged at two ends of the mounting valve body, a guide cover is arranged inside the mounting valve body, a connecting rod transmission mechanism is arranged in the guide cover, the output end of the connecting rod transmission mechanism is connected with a piston, a guide rail is further arranged on the inner wall of the guide cover, the outer wall of the piston is attached to the inner wall of the guide rail, a flow limiting cover is arranged at the end part of the piston, and strip-shaped flow limiting holes are uniformly distributed in the circumferential direction of the outer wall of the flow limiting cover.

Still further, be equipped with the step face on the second mouth, be equipped with on the step face and be used for the piston moves extremely spacing apron to the right, first draw-in groove has been seted up on the second mouth, be equipped with the second draw-in groove on the spacing apron, first draw-in groove with cooperate between the second draw-in groove and form the mounting groove that is used for installing T type sealing member, T type sealing member be used for with the piston outer wall is sealed.

Still further, the connecting rod drive mechanism includes the pivot, install the swing arm in the pivot, the tip of swing arm articulates there is the connecting rod, the tip of connecting rod with the piston articulates, the pivot drives when rotating the swing arm rotates, the swing arm drives the connecting rod push-and-pull the piston motion.

Still further, be equipped with pressure gauge before the valve and sensor before the valve on the first connecting tube, the superpressure relief valve group is including first connecting tube seat, first connecting tube seat top is equipped with first valve, first valve top is equipped with the superpressure relief valve.

Still further, still be equipped with the compensation joint between second connecting line with flow regulating and pressure regulating valve, still be equipped with behind the valve manometer and behind the valve sensor on the second connecting line, exhaust air compensating valve group is including the second connection tube socket, second connection tube socket top is equipped with the second valve, the second valve top is equipped with the air valve.

Further, the bottom of the second pipeline is also provided with a drain ball valve.

Further, the air valve side wall is also provided with a back flushing air valve.

Still further, the valve pocket inner wall is equipped with the spacing groove, the elasticity disk seat is including the disk seat main part, the disk seat main part with be equipped with the spring between the spacing groove terminal surface, disk seat main part lateral wall along radial be equipped with spacing groove complex spacing pin.

In general, the above technical solutions conceived by the present utility model have the following beneficial effects compared with the prior art:

(1) According to the online maintenance flow regulating and pressure regulating valve group, the overpressure relief valve group is additionally arranged on the front-valve maintenance valve, when the front-valve pressure of the flow regulating and pressure regulating valve suddenly rises, the overpressure relief valve is instantaneously opened for pressure relief when the pressure reaches the set value of the overpressure relief valve group, and the safety of a pipeline and a valve is protected;

(2) In addition, an exhaust and air compensating valve group is arranged on the after-valve maintenance valve, when the medium is filled in the pipeline for the first time, the medium flows in the before-valve maintenance valve and flows out of the after-valve maintenance valve, so that a large amount of gas in the pipeline can be discharged; when the pipeline normally operates, trace gas generated in the process of normal operation can be discharged through the exhaust and air-compensating valve group, so that the pipeline safety is protected, and in addition, the flow regulating and pressure regulating valve can timely supplement gas to the pipeline through the exhaust and air-compensating valve group when a negative pressure area is formed at a high flow rate, so that the pipeline safety is protected;

(3) In addition, after the flow regulating and pressure regulating valve runs for a period of time, garbage deposited in the flow regulating and pressure regulating valve needs to be cleaned, as the front check valve and the rear check valve of the valve are both eccentric half ball valves, the unique horizontal shaft structure of the eccentric half ball valves can open the valve cover when the valve is closed, personnel can easily enter the pipeline, the flow regulating and pressure regulating valve is maintained in the pipeline on line, the flow regulating and pressure regulating valve does not need to be disassembled and assembled, and the maintenance is convenient;

(4) And the side wall of the air valve is provided with a back flushing air valve, so that the air valve can be cleaned in time, and the exhaust and air supplementing effect of the air valve is improved.

Drawings

FIG. 1 is a schematic diagram of an on-line maintenance flow regulating and pressure regulating valve set provided by the utility model;

FIG. 2 is a schematic diagram of a flow regulating and regulating valve of the on-line maintenance flow regulating and regulating valve set provided by the utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic diagram of the structure of a service valve in front of a valve for maintaining a flow regulating and pressure regulating valve group online according to the present utility model;

FIG. 5 is a schematic diagram of the structure of the overpressure relief valve of the on-line maintenance flow-regulating and pressure-regulating valve group provided by the utility model;

FIG. 6 is a partial enlarged view at B in FIG. 4;

FIG. 7 is an enlarged view of a portion of FIG. 4 at C;

fig. 8 is a schematic diagram of the air valve of the on-line maintenance flow-regulating and pressure-regulating valve set provided by the utility model.

The corresponding structure of each numerical mark in the attached drawings is as follows: 1-first connecting line, 2-second connecting line, 3-flow regulating pressure regulating valve, 31-mounting valve body, 32-first port, 33-second port, 331-step face, 332-T seal, 34-pod, 35-link drive, 351-spindle, 352-swing arm, 353-link, 36-piston, 37-guide rail, 38-restrictor, 381-bar restrictor orifice, 39-restrictor cover, 4-pre-valve service valve, 41-valve body, 42-valve cover, 43-valve cavity, 44-inlet, 45-outlet, 46-resilient valve seat, 461-valve seat body, 462-spring, 463-restrictor pin, 47-valve core assembly, 471-valve stem, 472-seal seat, 473-cover plate, 474-sealing gasket, 48-connection port, 49-limit groove, 5-valve post-service valve, 6-overpressure relief valve bank, 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 gas make-up valve bank, 71-second connection pipe seat, 72-second valve, 73-air valve, 731-installation base, 732-blow-down valve, 733-air valve body, 734-air valve cavity, 735-support seat, 736-floating ball, 737-top cover, 738-exhaust cap, 74-backwash 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 connector, 11-post-valve pressure gauge, 12-post-valve sensor, 13-drain ball valve.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 8, the present utility model provides an on-line maintenance flow-regulating and pressure-regulating valve set, which can realize rapid pressure relief of a pipeline, and perform exhaust and air-supplementing, so as to facilitate on-line maintenance, and the on-line maintenance flow-regulating and pressure-regulating valve set comprises: the flow regulating and regulating valve 3 is arranged between the first connecting pipeline 1 and the second connecting pipeline 2, and the flow regulating and regulating valve 3 is used for communicating or cutting off the first connecting pipeline 1 and the second connecting pipeline 2; in order to facilitate the maintenance of the pipeline, a front valve maintenance valve 4 is arranged at the front end of the first connecting pipeline 1, the front valve maintenance valve 4 is used for controlling the on-off of the first connecting pipeline 1, a rear valve maintenance valve 5 is arranged at the rear end of the second connecting pipeline 2, and the rear valve maintenance valve 5 is used for controlling the on-off of the second connecting pipeline 2; in order to realize quick pressure relief of the pipeline, an overpressure relief valve group 6 is further arranged above the valve front maintenance valve 4, and in order to realize exhaust and air supplement of the pipeline, an exhaust air supplement valve group 7 is arranged above the valve rear maintenance valve 5, as shown in fig. 1, fluid medium flows in from the valve front maintenance valve 4, sequentially passes through the first connecting pipeline 1 and the flow regulating pressure regulating valve 3, and finally flows out from the valve rear maintenance valve 5, and each component is described in detail below in connection with specific embodiments.

Furthermore, in order to facilitate maintenance, in the embodiment, the front valve maintenance valve 4 and the rear valve maintenance valve 5 are both eccentric half ball valves, the unique horizontal shaft structure of the eccentric half ball valves can open the valve cover when the valves are closed, personnel can easily enter the pipeline, and the flow regulating and pressure regulating valve can be maintained on line in the pipeline without dismounting the flow regulating and pressure regulating valve, so that the maintenance is convenient; specifically, as shown in fig. 4, the front valve service valve 4 includes a valve body 41, a detachable valve cover 42 is disposed above the valve body 41, a valve cavity 43 is formed by assembling and connecting the valve body 41 and the valve cover 42 through a sealing member, the sealing member is generally made of rubber or silica gel, so as to improve the tightness of the valve cavity 43, an inlet 44 and an outlet 45 are disposed at two ends of the valve cavity 43, an elastic valve seat 46 is disposed in the inlet 44 or the outlet, in this embodiment, an elastic valve seat is disposed at the inlet of the front valve service valve 4, an elastic valve seat is disposed at the outlet of the rear valve service valve 5, in order to seal the elastic valve seat 46, a valve core assembly 47 is disposed in the valve cavity 43, the elastic valve seat 46 can be sealed when the valve core assembly 47 rotates, and the elastic valve seat 46 can improve the sealing effect of the whole valve; further, for convenience of connection with the overpressure relief valve group 6 or the exhaust and air compensating valve group 7, a connection port 48 is provided above the valve cover 42.

Specifically, in order to facilitate the installation and limitation of the elastic valve seat 46, as shown in fig. 6 and 7, a limiting groove 49 is provided on the inner wall of the valve cavity 43, the elastic valve seat 46 includes a valve seat main body 461, a sealing ring is uniformly distributed on the outer wall of the valve seat main body 461 for improving the sealing effect, meanwhile, a spring 462 is provided between the valve seat main body 461 and the end surface of the limiting groove 49, the spring 462 has a trend of pushing the valve seat main body 461 to move axially, and in order to facilitate the limitation when the valve seat main body 461 moves axially for sealing, a limiting pin 463 matched with the limiting groove 49 is provided on the side wall of the valve seat main body 461 in the radial direction, and the limiting pin 463 is blocked in the limiting groove 49 for limiting the axial movement of the valve seat main body 461; further, the valve core assembly 47 includes a valve stem 471, a sealing seat 472 is provided on the valve stem 471, a cover plate 473 is further provided on the sealing seat 472, a sealing gasket 474 is further provided between the sealing seat 472 and the cover plate 473, and the sealing gasket 474 is used for contacting and sealing with the valve seat main body 461.

The flow regulating and regulating valve 3 can control the on-off state between the first connecting pipeline 1 and the second connecting pipeline 2, and simultaneously regulate the flow in the pipelines, as shown in fig. 2, the flow regulating valve comprises a mounting valve body 31, a first port 32 and a second port 33 are respectively arranged at two ends of the mounting valve body 31, a medium flows in from the first port 32 and flows out from the second port 33, a guide cover 34 is arranged in the mounting valve body 31, the guide cover 34 is used for guiding when the medium flows, a connecting rod transmission mechanism 35 is arranged in the guide cover 34, the output end of the connecting rod transmission mechanism 35 is connected with a piston 36, a guide rail 37 is further arranged on the inner wall of the guide cover 34 for limiting the movement of the piston, the outer wall of the piston 36 is attached to the inner wall of the guide rail 37, a flow limiting cover 38 is arranged at the end part of the piston 36, strip-shaped limiting holes 381 are uniformly distributed on the outer wall of the flow limiting cover 38, the piston 36 can be opened and closed along the linear direction of the guide rail 37, and the second port 33 can be opened and closed, and simultaneously, the opening of the strip-shaped limiting holes 381 and the second port 33 can be regulated to the flow of the whole pipeline.

In order to improve the sealing effect when the second port 33 is closed, as shown in fig. 2, that is, when the piston 36 moves to the right limit, the second port 33 is completely closed, therefore, a step surface 331 is provided on the second port 33, a limit cover 39 for the piston 36 to move to the right limit is provided on the step surface 331, a first clamping groove is provided on the second port 33, a second clamping groove is provided on the limit cover 39, a mounting groove for mounting the T-shaped sealing element 332 is formed between the first clamping groove and the second clamping groove in a matching manner, and the T-shaped sealing element 332 is used for sealing with the outer wall of the piston 36.

The link transmission mechanism 35 is used for driving the piston 36 to reciprocate, as shown in fig. 2, and comprises a rotating shaft 351, a swing arm 352 is mounted on the rotating shaft 351, a link 353 is hinged at the end of the swing arm 352, the end of the link 353 is hinged with the piston 36, and the rotating shaft 351 drives the swing arm 352 to rotate when rotating, and the swing arm 352 drives the link 353 to push and pull the piston 36 to move.

In order to facilitate observation of the pressure condition in the first connecting pipeline 1, a valve front pressure gauge 8 and a valve front sensor 9 are arranged on the first connecting pipeline 1, the overpressure relief valve group 6 comprises a first connecting pipe seat 61, a first valve 62 is arranged above the first connecting pipe seat 61, an overpressure relief valve 63 is arranged above the first valve 62, wherein the first valve 62 is in a normally open state and is used for communicating the valve front maintenance valve 4 and the overpressure relief valve 63, the overpressure relief valve 63 is preset with pressure values according to the valve front pressure gauge 8 and the valve front sensor 9, when the overpressure is over-pressurized, the overpressure relief valve 63 is opened to realize instant pressure relief, and concretely, as shown in fig. 5, the overpressure relief valve 63 comprises a relief valve body 631, a relief valve cavity 632 is arranged in the relief valve body 631, a relief valve seat 633 and a relief outlet 634 are arranged in the valve cavity 632, meanwhile, a piston cylinder 635 is coaxially arranged above the relief valve seat 633, an elastic valve core assembly is coaxially arranged in the piston cylinder 635, the elastic valve core assembly comprises a sealing piston 636, the lower end of the sealing piston 636 is provided with a flexible sealing ring 637 used for sealing the relief valve 636, the flexible sealing piston 636 is fixed at the end of the sealing piston 639 through a pressing plate 638, the sealing piston 636 is also arranged at the sealing valve seat 639, and the other end is compressed by the sealing valve seat 639, and the sealing valve body is compressed by the sealing valve body 639, and tends to move against the sealing valve seat 639; when the pressure in the pipeline is at a normal value, the pressure relief valve seat 633 is in a sealing state, when the pressure in the pipeline is over-pressure, the sealing piston 636 compresses the compression spring 639 under the action of medium pressure, the sealing valve seat 633 is opened, and the medium flows out of the pressure relief outlet 634 through the sealing valve seat 633, so that quick pressure relief of the pipeline is realized.

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 arranged between the second connecting pipeline 2 and the flow regulating and pressure regulating valve 3, a valve back pressure gauge 11 and a valve back sensor 12 are further arranged on the second connecting pipeline 2, the exhaust and air supplementing valve group 7 comprises a second connecting pipe seat 71, the second connecting pipe seat 71 is directly communicated with a connecting port on the valve back maintenance valve 5, a second valve 72 is arranged above the second connecting pipe seat 71, the second valve 72 is also in a normally open state, an air valve 73 is arranged above the second valve 72, as shown in fig. 8, the air valve 73 comprises a mounting base 731 positioned at the upper end of the second valve 72, a blow-off valve 732 is arranged on the side wall of the mounting base 731, meanwhile, an air valve body 733 is arranged in the air valve cavity 734, a supporting seat 735 and a floating ball 736 are arranged in the air valve cavity 734, a top cover 737 is arranged at the upper end of the air valve body 737, an exhaust port 738 is arranged above the top cover 733, and the floating ball 736 moves up and down to be capable of switching on and off the exhaust port, so as to realize air supplementing or exhausting.

Because the air valve 73 is easy to adsorb impurities in the air supplementing or exhausting process, in order to clean the air valve conveniently, a back flushing air valve 74 is further arranged on the side wall of the air valve 73, as shown in fig. 8, the back flushing air valve 74 is provided with a first interface 741 and a second interface 742, wherein the first interface 741 is communicated with an air valve cavity 734 of the air valve 73, the second interface 742 is communicated with a second connecting seat 71, an exhaust valve 743 is further included, in order to avoid pollution of the exhaust valve, a filter 744 is arranged at the bottom of the exhaust valve 743, a connecting hose 745 communicated with the first interface 741 and the second interface 742 is arranged below the filter 744, in order to control the on-off of the first interface 741 and the second interface 742 conveniently, a valve 746 is arranged on the connecting hose 745, and when back flushing is performed, the second valve 72 is closed, and medium enters the air valve cavity 734 from the connecting hose 745 through the first interface 741 and is discharged from the drain valve 732 after repeated flushing.

When the on-line maintenance flow regulating and pressure regulating valve set provided by the utility model is used, the on-line maintenance flow regulating and pressure regulating valve set can be directly connected with a pipeline, when the pipeline is filled with medium for the first time, the medium flows in through the front valve overhaul valve 4 and flows out of the rear valve overhaul valve 5, and gas in the pipeline can be rapidly discharged; when the pipeline normally operates, trace gas generated in the process of normal operation can be discharged through the exhaust and air-compensating valve group, so that the pipeline safety is protected, and in addition, the flow regulating and pressure regulating valve can timely supplement gas to the pipeline through the exhaust and air-compensating valve group when a negative pressure area is formed at a high flow rate, so that the pipeline safety is protected; the quick pressure release, the exhaust and the air supplementing of the pipeline can be realized, the flow size and the on-off of the whole pipeline can be controlled through adjusting the flow regulating valve, when the flow regulating valve is maintained, the medium in the whole valve group is discharged quickly, the bottom of the second pipeline 2 is also provided with the drain ball valve 13, meanwhile, the front valve overhaul valve 4 and the rear valve overhaul valve 5 are both eccentric half ball valves, when the maintenance is carried out, the valve can be closed, the valve cover is opened, personnel can easily enter the pipeline, the flow regulating valve is maintained on line in the pipeline, the flow regulating valve is not required to be disassembled and assembled, and the maintenance is convenient.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims

1. An on-line maintenance flow regulating and pressure regulating valve group which is characterized in that: the device comprises a first connecting pipeline (1) and a second connecting pipeline (2), wherein a flow regulating and pressure regulating valve (3) is arranged between the first connecting pipeline (1) and the second connecting pipeline (2), and the flow regulating and pressure regulating valve (3) is used for communicating or cutting off the first connecting pipeline (1) and the second connecting pipeline (2); the front end of the first connecting pipeline (1) is provided with a valve front maintenance valve (4), the valve front maintenance valve (4) is used for controlling the on-off of the first connecting pipeline (1), the rear end of the second connecting pipeline (2) is provided with a valve rear maintenance valve (5), the valve rear maintenance valve (5) is used for controlling the on-off of the second connecting pipeline (2), the upper part of the valve front maintenance valve (4) is also provided with an overpressure relief valve group (6), and the upper part of the valve rear maintenance valve (5) is provided with an exhaust and air supplementing valve group (7).

2. The on-line maintenance flow regulating and pressure regulating valve set according to claim 1, wherein: the front valve maintenance valve (4) and the rear valve maintenance valve (5) are eccentric half ball valves, the front valve maintenance valve (4) comprises a valve body (41), a detachable valve cover (42) is arranged above the valve body (41), the valve body (41) and the valve cover (42) are assembled and connected through sealing elements to form a valve cavity (43), an inlet (44) and an outlet (45) are formed in two ends of the valve cavity (43), an elastic valve seat (46) is arranged in the inlet (44) or the outlet, a valve core assembly (47) is arranged in the valve cavity (43), the valve core assembly (47) rotates to seal the elastic valve seat (46), and a connecting port (48) is formed above the valve cover (42).

3. The on-line maintenance flow regulating and pressure regulating valve set according to claim 1, wherein: the flow regulating and pressure regulating valve comprises a mounting valve body (31), a first port (32) and a second port (33) are respectively arranged at two ends of the mounting valve body (31), a guide cover (34) is arranged inside the mounting valve body (31), a connecting rod transmission mechanism (35) is arranged in the guide cover (34), a piston (36) is connected to the output end of the connecting rod transmission mechanism (35), a guide rail (37) is further arranged on the inner wall of the guide cover (34), the outer wall of the piston (36) is attached to the inner wall of the guide rail (37), a flow limiting cover (38) is arranged at the end part of the piston (36), and strip-shaped flow limiting holes (381) are uniformly distributed in the circumferential direction of the outer wall of the flow limiting cover (38).

4. The on-line maintenance flow regulating and pressure regulating valve set as set forth in claim 3, wherein: be equipped with step face (331) on second mouth (33), be equipped with on step face (331) and be used for piston (36) move extremely spacing apron (39) right, first draw-in groove has been seted up on second mouth (33), be equipped with the second draw-in groove on spacing apron (39), first draw-in groove with cooperate between the second draw-in groove and form the mounting groove that is used for installing T type sealing member (332), T type sealing member (332) be used for with piston (36) outer wall is sealed.

5. The on-line maintenance flow regulating and pressure regulating valve set as set forth in claim 3, wherein: the connecting rod transmission mechanism (35) comprises a rotating shaft (351), a swing arm (352) is arranged on the rotating shaft (351), a connecting rod (353) is hinged to the end part of the swing arm (352), the end part of the connecting rod (353) is hinged to the piston (36), the rotating shaft (351) drives the swing arm (352) to rotate when rotating, and the swing arm (352) drives the connecting rod (353) to push and pull the piston (36) to move.

6. The on-line maintenance flow regulating and pressure regulating valve set according to claim 1, wherein: be equipped with preceding manometer (8) of valve and preceding sensor (9) on first connecting pipeline (1), superpressure relief valve group (6) are including first connection tube socket (61), first connection tube socket (61) top is equipped with first valve (62), first valve (62) top is equipped with superpressure relief valve (63).

7. The on-line maintenance flow regulating and pressure regulating valve set according to claim 1, wherein: the exhaust and air-compensation valve is characterized in that a compensation joint (10) is further arranged between the second connecting pipeline (2) and the flow-regulating pressure regulating valve (3), a post-valve pressure gauge (11) and a post-valve sensor (12) are further arranged on the second connecting pipeline (2), the exhaust and air-compensation valve group (7) comprises 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 on-line maintenance flow regulating and pressure regulating valve set according to claim 1, wherein: the bottom of the second connecting pipeline (2) is also provided with a drain ball valve (13).

9. The on-line maintenance flow regulating and pressure regulating valve set according to claim 7, wherein: the side wall of the air valve (73) is also provided with a back flushing air valve (74).

10. The on-line maintenance flow regulating and pressure regulating valve set according to claim 2, wherein: the valve is characterized in that a limiting groove (49) is formed in the inner wall of the valve cavity (43), the elastic valve seat (46) comprises a valve seat main body (461), a spring (462) is arranged between the valve seat main body (461) and the end face of the limiting groove (49), and a limiting pin (463) matched with the limiting groove (49) is arranged on the side wall of the valve seat main body (461) along the radial direction.