CN111473123B

CN111473123B - High-sealing pneumatic diaphragm double-seat adjusting valve and working mode

Info

Publication number: CN111473123B
Application number: CN202010313472.8A
Authority: CN
Inventors: 王加齐; 王小雷
Original assignee: Beifa Group Beijing Valve Co ltd
Current assignee: BEIFA GROUP BEIJING VALVE Co.,Ltd.
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2022-03-18
Anticipated expiration: 2040-04-20
Also published as: CN111473123A

Abstract

The invention discloses a high-sealing pneumatic diaphragm double-seat regulating valve which comprises a valve body, a valve cover and a sleeve, wherein the sleeve is arranged between the valve body and the valve cover through bolts, a support is arranged on the valve cover, a protective cover is arranged at the top end of the support, an execution mechanism is arranged in the protective cover, the output end of the execution mechanism is connected with the top end of a valve rod, the bottom end of the valve rod penetrates through the valve cover and extends into the valve body, the bottom end of the valve rod is connected with an upper valve core, a lower valve core is arranged right below the upper valve core, the upper end and the lower end of the interior of the valve body are respectively provided with an upper valve seat and a lower valve seat, sealing sleeves are respectively sleeved on the lower valve core and the upper valve core, a sealing gasket is arranged between the valve cover and the sleeve, a packing gasket is arranged between the valve rod and the valve seat, and a sealing gasket is arranged between a first flange and a second flange; the invention greatly improves the sealing performance of the regulating valve, is convenient to be installed and detached with an inlet and outlet pipeline, and is convenient to open the protective cover on the actuating mechanism to maintain the actuating mechanism.

Description

High-sealing pneumatic diaphragm double-seat adjusting valve and working mode

Technical Field

The invention belongs to the technical field of valves, relates to a pneumatic diaphragm double-seat regulating valve, and particularly relates to a high-sealing pneumatic diaphragm double-seat regulating valve and a working mode.

Background

A regulating valve is a commonly used regulating element for changing parameters such as medium flow, pressure, temperature, liquid level, etc. The pressure of the application environment of the pneumatic double-seat regulating valve is higher than that of the pneumatic single-seat regulating valve, and the pneumatic double-seat regulating valve has better stability.

In the prior art, the regulating valve has the problems of insufficient sealing property and easy leakage after long-term use; the flange on the regulating valve and the flange of the inlet and outlet pipeline are installed in a bolt mode, and six or more than six groups of bolts are usually needed for fixing, so that a plurality of groups of bolts need to be rotated during installation, the installation and disassembly efficiency of the regulating valve is extremely low, and in addition, when the installation position of the regulating valve is positioned in a high-altitude area with densely distributed pipelines, a worker installs and disassembles the loosened bolts again, so the traditional regulating valve is inconvenient to install and disassemble; in fields such as daily chemical industry, can't start the valve stem work because of actuating mechanism breaks down, just can not control the flow condition of medium at this time, need the staff promptly to open the visor fast and maintain actuating mechanism, and current visor all adopts the bolt of multiunit to fasten, leads to meeting under emergency, and this preparation work of opening the visor all needs to spend the dead time, influences the problem of salvageing time.

Disclosure of Invention

The invention aims to solve the problems that the regulating valve in the prior art is insufficient in sealing property after long-term use and easy to leak; the flange on the regulating valve and the flange of the inlet and outlet pipeline are installed in a bolt mode, and six or more than six groups of bolts are usually needed for fixing, so that a plurality of groups of bolts need to be rotated during installation, the installation and disassembly efficiency of the regulating valve is extremely low, and in addition, when the installation position of the regulating valve is positioned in a high-altitude area with densely distributed pipelines, a worker installs and disassembles the loosened bolts again, so the traditional regulating valve is inconvenient to install and disassemble; in fields such as daily chemical industry, can't start the valve stem work because of actuating mechanism breaks down, the flow condition of control medium just can not be controlled at this time, need the staff promptly to open the visor fast and maintain actuating mechanism, and current visor all adopts the bolt of multiunit to fasten, leads to meeting under emergency, and this preparation work of opening the visor all needs to spend the dead time, influences the problem of rush-repair time, and provides a high leakproofness pneumatic diaphragm double-seat governing valve and working method.

The purpose of the invention can be realized by the following technical scheme:

a high-sealing pneumatic diaphragm double-seat regulating valve comprises a valve body, a valve cover and a sleeve, wherein the sleeve is installed between the valve body and the valve cover through bolts, a support is arranged on the valve cover, a protective cover is installed at the top end of the support, an execution mechanism is arranged in the protective cover, the output end of the execution mechanism is connected with the top end of a valve rod, the bottom end of the valve rod penetrates through the valve cover and extends into the valve body, the bottom end of the valve rod is connected with an upper valve core, a lower valve core is arranged right below the upper valve core, an upper valve seat and a lower valve seat are respectively arranged at the upper end and the lower end of the interior of the valve body, flow passages are respectively arranged on the upper valve seat and the lower valve seat, the upper valve core is located at a flow passage opening of the upper valve seat, and the lower valve core is located at a flow passage opening of the lower valve seat;

the lower valve core and the upper valve core are respectively sleeved with a sealing sleeve, a sealing gasket is arranged between the valve cover and the sleeve, a packing gasket is arranged between the valve rod and the valve seat, a feeding end and a discharging end of the valve body are respectively provided with a first flange plate, the first flange plates are respectively connected with second flange plates on the liquid inlet pipe and the liquid outlet pipe through mounting pipes, and a sealing gasket is arranged between the first flange plates and the second flange plates.

Preferably, the installation pipe evenly is provided with the multiunit along first ring flange, is provided with the mounting hole with installation pipe looks adaptation on the second ring flange.

Preferably, the installation pipe includes fixed disk, hollow tube, fixed block and first operating device, and the even equidistant installation of fixed disk is on first ring flange, and the hollow tube is installed to the lateral wall of fixed disk, and the hollow tube passes first ring flange to with first ring flange fixed connection, the fixed block evenly is provided with the multiunit along the hollow tube, and with the lateral wall sliding connection of hollow tube, be provided with first operating device in the hollow tube.

Preferably, first operating device includes the slide bar, the fixed plate, the spacing groove, the movable rod, first spring and connecting plate, install the fixed plate on the inner wall of hollow tube, be provided with the spacing groove with fixed block looks adaptation on the fixed plate, the fixed block slides along the spacing groove, and pass the lateral wall of hollow tube, the one end of slide bar passes fixed disk and fixed plate in proper order, and respectively with fixed disk and fixed plate sliding connection, the connecting plate is installed to one of slide bar, the connecting plate passes through the one end swing joint that movable rod and fixed block are close to the slide bar.

Preferably, the sliding rod is sleeved with a first spring, and two ends of the first spring are respectively connected with the fixed plate and the connecting plate.

Preferably, the protective cover comprises a lower protective cover, an upper protective cover and mounting blocks, the actuating mechanism is located on the lower protective cover, a plurality of groups of insertion rods are uniformly arranged on the bottom surface of the upper protective cover, a plurality of groups of mounting blocks are uniformly arranged on the side wall of the lower protective cover, and insertion holes matched with the insertion rods are formed in the lower protective cover and the mounting blocks.

Preferably, the installation block is internally provided with a second operating mechanism, the second operating mechanism comprises an operating plate, an operating rod, a second spring, a wedge-shaped block, a pin block and a third spring, the installation block is provided with an installation groove, the installation groove is symmetrically provided with two groups along the insertion holes, the installation groove is internally provided with the third spring, two ends of the third spring are respectively connected with the inner wall of the installation groove and the wedge-shaped block, the wedge-shaped block is connected with the pin block along the installation groove in a sliding manner, one side, far away from the third spring, of the wedge-shaped block is connected with the pin block, the insertion rod is provided with a pin hole matched with the pin block, one end of the operating rod is an inclined surface and extends into the installation groove, the operating rod is abutted to the inclined surface of the wedge-shaped block, and the other end of the operating rod is connected with the operating plate.

Preferably, the operating rod is sleeved with a second spring, and two ends of the second spring are respectively connected with the outer walls of the operating plate and the mounting block.

The working mode of the high-tightness pneumatic diaphragm double-seat regulating valve comprises the following steps:

s1, installing a slide bar in the hollow pipe to enable the slide bar to move along the fixed disc and the fixed plate and drive the connecting plate to move towards the direction far away from the fixed plate, enabling the fixed block to be contracted into the limiting groove through the movable rod by the connecting plate, meanwhile, enabling the first spring to be in an extension state, aligning the mounting holes of the second flange plates on the liquid inlet pipe and the liquid outlet pipe with the hollow pipe and inserting the mounting holes along the hollow pipe, enabling the first flange plates to be tightly abutted against the second flange plates through the sealing gaskets, releasing external force on the slide bar, enabling the fixed block to extend out of the hollow pipe under the action of restoring force of the first spring, and clamping and fixing the first flange plates and the second flange plates to complete the installation work of the valve body and the liquid inlet pipe and the liquid outlet pipe;

s2, the operating plate is pressed towards the direction of the mounting block, so that the operating rod pushes the wedge-shaped block to move towards the direction away from the insertion hole, the pin block moves out of the pin hole in the insertion rod and retracts into the mounting groove, meanwhile, the second spring and the third spring are in a compressed state, the upper protective cover is taken down from the lower protective cover, and the actuating mechanism in the lower protective cover is maintained.

Compared with the prior art, the invention has the beneficial effects that: the slide rod is arranged in the hollow pipe, so that the slide rod moves along the fixed disc and the fixed plate, the connecting plate is driven to move towards the direction far away from the fixed plate, the connecting plate enables the fixed block to be contracted into the limit groove through the movable rod, meanwhile, the first spring is in an extension state, then, the mounting holes of the second flange plates on the liquid inlet pipe and the liquid outlet pipe are aligned with the hollow pipe and inserted along the hollow pipe, after the first flange plate is tightly abutted against the second flange plates through the sealing gaskets, the external force on the slide rod is released, the fixed block extends out of the hollow pipe towards the direction under the action of the restoring force of the first spring, the first flange plate and the second flange plate are clamped and fixed, the mounting work of the valve body, the liquid inlet pipe and the liquid outlet pipe is completed, the mounting pipe is arranged, when the mounting and dismounting work of the regulating valve and the inlet and outlet pipeline are carried out, only the slide rod needs to be pressed by operation of extrusion, and the mounting and dismounting work efficiency of the regulating valve is greatly improved, the adjusting valve is convenient to replace and maintain, wherein the hollow pipe in the installation pipe also has the function of aligning and positioning, so that the problems of low installation and disassembly efficiency of the adjusting valve due to the fact that in the prior art, the flange on the adjusting valve and the flange of an inlet and outlet pipeline are installed in a bolt mode, and more than six groups of bolts are usually needed to be fixed, so that a plurality of groups of bolts need to be rotated during installation, and in addition, when the installation position of the adjusting valve is located at a high place and in an area with dense pipeline arrangement, a worker installs and disassembles loose bolts again, so that the traditional adjusting valve is installed and disassembled and inconvenient;

the operating plate is pressed towards the direction of the mounting block, so that the operating rod pushes the wedge-shaped block to move towards the direction far away from the jack, the pin block is moved out of the pin hole on the inserted rod and is retracted into the mounting groove, meanwhile, the second spring and the third spring are in a compressed state, the upper protective cover is taken down from the lower protective cover, the actuating mechanism in the lower protective cover is maintained, the protective cover can be opened and closed by pressing the operating plate through the arranged mounting block, a worker can rapidly open the protective cover to maintain the actuating mechanism in the protective cover, and the problems that in the prior art, in the fields of daily chemical engineering and the like, the valve rod cannot be started to work due to the failure of the actuating mechanism, the flow condition of a medium cannot be controlled at this time, the worker needs to rapidly open the protective cover urgently to maintain the actuating mechanism, and the existing protective covers are fastened by adopting a plurality of groups of bolts are solved, the problem that in emergency situations, certain time is needed for opening the protective cover to prepare, and the rush repair time is affected is caused;

the sealing performance of connection between the valve core and the valve seat is improved through the arranged sealing sleeve, the sealing performance of connection between the valve cover and the valve body is improved through the sealing gasket, and the sealing performance of connection between the valve rod and the valve seat is improved through the arranged packing gasket, so that the overall sealing performance of the regulating valve is improved.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic overall perspective structure of the present invention.

Fig. 2 is a schematic structural diagram of the whole of the present invention.

Fig. 3 is a schematic perspective view of an upper valve element according to the present invention.

Fig. 4 is a perspective view of the installation tube of the present invention.

Fig. 5 is a schematic view of the inside of the installation tube in the present invention.

Fig. 6 is a schematic structural diagram of the protective cover of the present invention.

Fig. 7 is a schematic structural view of a mounting block in the present invention.

In the figure: 1. a valve body; 2. a valve cover; 3. a support; 4. a valve stem; 5. a protective cover; 6. a lower valve core; 7. an upper valve core; 8. an upper valve seat; 9. a lower valve seat; 10. a gasket; 11. a packing washer; 12. a sleeve; 13. a lower protective cover; 14. an upper protective cover; 15. mounting blocks; 16. an actuator; 17. a first flange plate; 18. a sealing gasket; 19. a liquid inlet pipe; 20. a liquid outlet pipe; 21. a second flange plate; 22. installing a pipe; 23. fixing the disc; 24. a hollow tube; 25. a fixing plate; 26. a slide bar; 27. a fixing plate; 28. a limiting groove; 29. a movable rod; 30. a first spring; 31. a connecting plate; 32. inserting a rod; 33. a pin hole; 34. a jack; 35. mounting grooves; 36. an operation panel; 37. an operating lever; 38. a second spring; 39. a wedge-shaped block; 40. a pin block; 41. a third spring; 42. and (5) sealing the sleeve.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, a high-sealing pneumatic diaphragm double-seat regulating valve comprises a valve body 1, a valve cover 2 and a sleeve 12, wherein the sleeve 12 is installed between the valve body 1 and the valve cover 2 through bolts, a support 3 is arranged on the valve cover 2, a protective cover 5 is installed at the top end of the support 3, an actuating mechanism 16 is arranged in the protective cover 5, the output end of the actuating mechanism 16 is connected with the top end of a valve rod 4, the bottom end of the valve rod 4 penetrates through the valve cover 2 and extends into the valve body 1, the bottom end of the valve rod 4 is connected with an upper valve core 7, a lower valve core 6 is arranged right below the upper valve core 7, an upper valve seat 8 and a lower valve seat 9 are respectively arranged at the upper end and the lower end inside the valve body 1, flow passages are respectively arranged on the upper valve seat 8 and the lower valve seat 9, the upper valve core 7 is positioned at the flow passage of the upper valve seat 8, and the lower valve core 6 is positioned at the flow passage of the lower valve seat 9;

the lower valve core 6 and the upper valve core 7 are respectively sleeved with a sealing sleeve 42, a sealing gasket 10 is arranged between the valve cover 2 and the sleeve 12, a packing gasket 11 is arranged between the valve rod 4 and the valve cover 2, a first flange 17 is respectively arranged at the feed end and the discharge end of the valve body 1, the first flange 17 is respectively connected with a second flange 21 on the liquid inlet pipe 19 and the liquid outlet pipe 20 through an installation pipe 22, a sealing gasket 18 is arranged between the first flange 17 and the second flange 21, the sealing performance of connection between the valve core and the valve seat is improved through the arranged sealing sleeve 42, the sealing performance of connection between the valve cover 2 and the valve body 1 is improved through the sealing gasket 10, and the sealing performance of connection between the valve rod 4 and the valve cover 2 is improved through the arranged packing gasket 11, so that the whole sealing performance of the regulating valve is improved.

The installation pipe 22 is evenly provided with multiunit along first ring flange 17, is provided with the mounting hole with installation pipe 22 looks adaptation on the second ring flange 21.

The mounting tube 22 comprises a fixed disc 23, a hollow tube 24, a fixed block 25 and a first operating mechanism, the fixed disc 23 is uniformly and equidistantly mounted on the first flange plate 17, the hollow tube 24 is mounted on the side wall of the fixed disc 23, the hollow tube 24 penetrates through the first flange plate 17 and is fixedly connected with the first flange plate 17, the fixed block 25 is uniformly provided with a plurality of groups along the hollow tube 24 and is in sliding connection with the side wall of the hollow tube 24, and the first operating mechanism is arranged in the hollow tube 24.

The first operating mechanism comprises a sliding rod 26, a fixing plate 27, a limiting groove 28, a movable rod 29, a first spring 30 and a connecting plate 31, wherein the fixing plate 27 is installed on the inner wall of the hollow tube 24, the fixing plate 27 is provided with the limiting groove 28 matched with the fixing block 25, the fixing block 25 slides along the limiting groove 28 and penetrates through the side wall of the hollow tube 24, one end of the sliding rod 26 sequentially penetrates through the fixing plate 23 and the fixing plate 27 and is respectively connected with the fixing plate 23 and the fixing plate 27 in a sliding mode, the connecting plate 31 is installed at one end of the sliding rod 26, and the connecting plate 31 is movably connected with one end, close to the sliding rod 26, of the fixing block 25 through the movable rod 29.

The sliding rod 26 is sleeved with a first spring 30, two ends of the first spring 30 are respectively connected with the fixed plate 27 and the connecting plate 31, the sliding rod 26 is installed in the hollow tube 24, the sliding rod 26 moves along the fixed plate 23 and the fixed plate 27, the connecting plate 31 is driven to move towards the direction far away from the fixed plate 27, the connecting plate 31 enables the fixed block 25 to be contracted into the limiting groove 28 through the movable rod 29, meanwhile, the first spring 30 is in an extension state, then, the installation holes of the second flange 21 on the liquid inlet tube 19 and the liquid outlet tube 20 are aligned with the hollow tube 24 and inserted along the hollow tube 24, after the first flange 17 is tightly abutted to the second flange 21 through the sealing washer 18, the external force on the sliding rod 26 is released, the fixed block 25 extends out of the hollow tube 24 under the restoring force action of the first spring 30, the first flange 17 is tightly clamped and fixed with the second flange 21, and the installation work of the valve body 1 with the liquid inlet tube 19 and the liquid outlet tube 20 is completed, the installation pipe 22 is arranged, when the installation and disassembly work of the regulating valve and the inlet and outlet pipeline is carried out, only the sliding rod 26 is required to be operated and pressed, the installation and disassembly work efficiency of the regulating valve is greatly improved, the replacement and maintenance of the regulating valve are convenient, wherein, the hollow pipe 24 in the installation pipe 22 will also play the role of aligning and positioning, thereby solving the problems that in the prior art, the flange on the adjusting valve and the flange of the inlet and outlet pipeline are installed by adopting a bolt mode, but six or more than six groups of bolts are usually needed for fixing, thereby causing the installation of a plurality of groups of bolts to be rotated, causing the installation and the disassembly efficiency of the regulating valve to be extremely low, in addition, when the mounting position of governing valve is located the eminence, when the intensive region of pipeline arrangement, during the staff carries out the installation of governing valve again and dismantles not hard up bolt, so traditional governing valve's installation and dismantlement and inconvenient problem.

The protective cover 5 comprises a lower protective cover 13, an upper protective cover 14 and mounting blocks 15, the actuating mechanism 16 is positioned on the lower protective cover 13, a plurality of groups of insertion rods 32 are uniformly arranged on the bottom surface of the upper protective cover 14, a plurality of groups of mounting blocks 15 are uniformly arranged on the side wall of the lower protective cover 13, and insertion holes 34 matched with the insertion rods 32 are arranged in the lower protective cover 13 and the mounting blocks 15.

The second operating mechanism is arranged in the mounting block 15 and comprises an operating plate 36, an operating rod 37, a second spring 38, a wedge block 39, a pin block 40 and a third spring 41, a mounting groove 35 is formed in the mounting block 15, two groups of mounting grooves 35 are symmetrically arranged along the insertion hole 34, the third spring 41 is arranged in the mounting groove 25, two ends of the third spring 41 are respectively connected with the inner wall of the mounting groove 35 and the wedge block 39, the wedge block 39 is connected with the mounting groove 35 in a sliding mode, one side, far away from the third spring 41, of the wedge block 39 is connected with the pin block 40, a pin hole 33 matched with the pin block 40 is formed in the insertion rod 32, one end of the operating rod 37 is an inclined surface and extends into the mounting groove 35, the operating rod 37 abuts against the inclined surface of the wedge block 39, and the other end of the operating rod 37 is connected with the operating plate 36.

The second spring 38 is sleeved on the operating rod 37, two ends of the second spring 38 are respectively connected with the operating plate 36 and the outer wall of the mounting block 15, the operating rod 37 pushes the wedge-shaped block 39 to move in the direction away from the insertion hole 34 by pressing the operating plate 36 towards the mounting block 15, so that the pin block 40 moves out of the pin hole 33 on the insertion rod 32 and retracts into the mounting groove 35, meanwhile, the second spring 38 and the third spring 41 are in a compressed state, the upper protective cover 14 is taken down from the lower protective cover 13, the actuating mechanism 16 in the lower protective cover 13 is maintained, the mounting block 15 can be operated by pressing the operating plate 36, so that the protective cover 5 can be opened and closed, a worker can open the protective cover 5 quickly and maintain the actuating mechanism 16 in the protective cover 5, and the problem that in the prior art, in the fields of daily chemical engineering and the like, the valve rod 4 cannot be started to work due to the failure of the actuating mechanism 16 is solved, at this time, the flow condition of the medium cannot be controlled, and a worker needs to open the protective cover 5 to repair the actuating mechanism 16 urgently and quickly, but the existing protective covers 5 are fastened by adopting multiple groups of bolts, so that in an emergency situation, the preparation work of opening the protective cover 5 needs to take a certain time, and the problem of influencing the repair time is solved.

s1, installing the slide rod 26 in the hollow tube 24 to enable the slide rod 26 to move along the fixed disc 23 and the fixed plate 27, driving the connecting plate 31 to move towards the direction far away from the fixed plate 27, enabling the fixed block 25 to shrink into the limiting groove 28 through the connecting plate 31 through the movable rod 29, enabling the first spring 30 to be in an extension state, aligning the mounting holes of the second flange 21 on the liquid inlet tube 19 and the liquid outlet tube 20 with the hollow tube 24 and inserting the mounting holes along the hollow tube 24, enabling the first flange 17 to be tightly abutted to the second flange 21 through the sealing washer 18, releasing the external force on the slide rod 26, enabling the fixed block 25 to extend out of the hollow tube 24 under the restoring force action of the first spring 30, clamping and fixing the first flange 17 and the second flange 21, and completing the installation work of the valve body 1 with the liquid inlet tube 19 and the liquid outlet tube 20;

s2, the operating lever 37 pushes the wedge block 39 to move away from the insertion hole 34 by pressing the operating plate 36 toward the mounting block 15, so that the pin block 40 moves out of the pin hole 33 of the insertion rod 32 and retracts into the mounting groove 35, and the second spring 38 and the third spring 41 are compressed, so that the upper protection cover 14 is removed from the lower protection cover 13, and the actuator 16 in the lower protection cover 13 is repaired.

The working principle of the invention is as follows: by installing the sliding rod 26 in the hollow tube 24, the sliding rod 26 moves along the fixed disc 23 and the fixed plate 27, the connecting plate 31 is driven to move in the direction away from the fixed plate 27, the connecting plate 31 enables the fixed block 25 to shrink into the limiting groove 28 through the movable rod 29, meanwhile, the first spring 30 is in an extension state, then, the mounting holes of the second flange discs 21 on the liquid inlet tube 19 and the liquid outlet tube 20 are aligned with the hollow tube 24 and inserted along the hollow tube 24, after the first flange disc 17 is tightly abutted to the second flange disc 21 through the sealing washer 18, the external force on the sliding rod 26 is released, under the restoring force action of the first spring 30, the fixed block 25 extends out of the hollow tube 24, the first flange disc 17 and the second flange disc 21 are clamped and fixed, the mounting work of the valve body 1 and the liquid inlet tube 19 and the liquid outlet tube 20 is completed, the mounting tube 22 is arranged, when the mounting and dismounting work of the regulating valve and the inlet and outlet tubes is carried out, the installation and disassembly efficiency of the regulating valve is greatly improved only by operating and pressing the sliding rod 26 through extrusion, the regulating valve is convenient to replace and maintain, wherein the hollow pipe 24 in the installation pipe 22 also has the function of aligning and positioning, so that the problems that in the prior art, a flange on the regulating valve and a flange of an inlet and outlet pipeline are installed in a bolt mode, six or more groups of bolts are usually needed for fixing, so that a plurality of groups of bolts need to be rotated during installation, the installation and disassembly efficiency of the regulating valve is extremely low, in addition, when the installation position of the regulating valve is located in a high place and a pipeline arrangement dense area, workers install and disassemble loose bolts again, and the traditional regulating valve is installed and disassembled and inconvenient are solved;

the operating plate 36 is pressed towards the mounting block 15, so that the operating rod 37 pushes the wedge-shaped block 39 to move towards the direction away from the insertion hole 34, the pin block 40 is moved out of the pin hole 33 on the insertion rod 32 and is retracted into the mounting groove 35, meanwhile, the second spring 38 and the third spring 41 are in a compressed state, the upper protective cover 14 is taken down from the lower protective cover 13, the actuating mechanism 16 in the lower protective cover 13 is maintained, the protective cover 5 can be opened and closed by pressing the operating plate 36 through the arranged mounting block 15, a worker can open the protective cover 5 quickly and maintain the actuating mechanism 16 in the protective cover 5 conveniently, and the problems that in the prior art, in the fields of daily chemical engineering and the like, the valve rod 4 cannot be started to work due to the failure of the actuating mechanism 16, the flow of a medium cannot be controlled at this time, the worker needs to open the protective cover 5 quickly and maintain the actuating mechanism 16 urgently, the existing protective covers 5 are fastened by adopting a plurality of groups of bolts, so that in an emergency situation, the preparation work of opening the protective covers 5 takes a certain time, and the problem of influencing the rush repair time is solved;

the sealing performance of connection between the valve core and the valve seat is improved through the arranged sealing sleeve 42, the sealing performance of connection between the valve cover 2 and the valve body 1 is improved through the sealing gasket 10, and the sealing performance of connection between the valve rod 4 and the valve cover 2 is improved through the arranged packing gasket 11, so that the overall sealing performance of the regulating valve is improved.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a pneumatic diaphragm double seat governing valve of high leakproofness which characterized in that: comprises a valve body (1), a valve cover (2) and a sleeve (12), wherein the sleeve (12) is arranged between the valve body (1) and the valve cover (2) through bolts, a support (3) is arranged on the valve cover (2), a protective cover (5) is arranged at the top end of the support (3), an actuating mechanism (16) is arranged in the protective cover (5), the output end of the actuating mechanism (16) is connected with the top end of a valve rod (4), the bottom end of the valve rod (4) penetrates through the valve cover (2) and extends to the inside of the valve body (1), the bottom end of the valve rod (4) is connected with an upper valve core (7), a lower valve core (6) is arranged right below the upper valve core (7), an upper valve seat (8) and a lower valve seat (9) are respectively arranged at the upper end and the lower end of the inside of the valve body (1), flow passage ports are respectively arranged on the upper valve seat (8) and the lower valve seat (9), the upper valve core (7) is positioned at the flow passage port of the upper valve seat (8), the lower valve core (6) is positioned at the flow passage opening of the lower valve seat (9);

a sealing sleeve (42) is respectively sleeved on the lower valve core (6) and the upper valve core (7), a sealing gasket (10) is arranged between the valve cover (2) and the sleeve (12), a packing gasket (11) is arranged between the valve rod (4) and the valve cover (2), a first flange (17) is respectively arranged at the feeding end and the discharging end of the valve body (1), the first flange (17) is respectively connected with a second flange (21) on the liquid inlet pipe (19) and the liquid outlet pipe (20) through an installation pipe (22), and a sealing gasket (18) is arranged between the first flange (17) and the second flange (21);

the mounting pipe (22) comprises a fixed disc (23), hollow pipes (24), fixed blocks (25) and a first operating mechanism, the fixed disc (23) is uniformly and equidistantly mounted on a first flange plate (17), the hollow pipes (24) are mounted on the side wall of the fixed disc (23), the hollow pipes (24) penetrate through the first flange plate (17) and are fixedly connected with the first flange plate (17), the fixed blocks (25) are uniformly provided with a plurality of groups along the hollow pipes (24) and are in sliding connection with the side wall of the hollow pipes (24), and the first operating mechanism is arranged in the hollow pipes (24);

the first operating mechanism comprises a sliding rod (26), a fixing plate (27), a limiting groove (28), a movable rod (29), a first spring (30) and a connecting plate (31), the fixing plate (27) is installed on the inner wall of the hollow tube (24), the limiting groove (28) matched with the fixing block (25) is formed in the fixing plate (27), the fixing block (25) slides along the limiting groove (28) and penetrates through the side wall of the hollow tube (24), one end of the sliding rod (26) penetrates through a fixed disc (23) and the fixing plate (27) in sequence and is connected with the fixed disc (23) and the fixing plate (27) in a sliding mode respectively, the connecting plate (31) is installed on one end of the sliding rod (26), and the connecting plate (31) is movably connected with one end, close to the sliding rod (26), of the fixed block (25) through the movable rod (29).

2. The pneumatic diaphragm double-seat adjusting valve with high sealing performance as claimed in claim 1, wherein the mounting pipes (22) are uniformly arranged in multiple groups along the first flange (17), and the second flange (21) is provided with mounting holes matched with the mounting pipes (22).

3. The high-tightness pneumatic diaphragm double-seat regulating valve as claimed in claim 2, wherein the sliding rod (26) is sleeved with a first spring (30), and two ends of the first spring (30) are respectively connected with the fixing plate (27) and the connecting plate (31).

4. The high-sealing pneumatic diaphragm double-seat regulating valve as claimed in claim 3, wherein the protective cover (5) comprises a lower protective cover (13), an upper protective cover (14) and mounting blocks (15), the actuator (16) is located on the lower protective cover (13), a plurality of groups of insertion rods (32) are uniformly arranged on the bottom surface of the upper protective cover (14), a plurality of groups of mounting blocks (15) are uniformly arranged on the side wall of the lower protective cover (13), and insertion holes (34) matched with the insertion rods (32) are formed in the lower protective cover (13) and the mounting blocks (15).

5. The high-sealing pneumatic diaphragm double-seat adjusting valve is characterized in that a second operating mechanism is arranged in the mounting block (15), the second operating mechanism comprises an operating plate (36), an operating rod (37), a second spring (38), a wedge block (39), a pin block (40) and a third spring (41), two groups of mounting grooves (35) are symmetrically arranged on the mounting block (15) along the insertion hole (34), the third spring (41) is arranged in the mounting groove (25), two ends of the third spring (41) are respectively connected with the inner wall of the mounting groove (35) and the wedge block (39), the wedge block (39) is slidably connected along the mounting groove (35), one side, far away from the third spring (41), of the wedge block (39) is connected with the pin block (40), a pin hole (33) matched with the pin block (40) is arranged on the insertion rod (32), one end of the operating rod (37) is an inclined surface and extends into the mounting groove (35), the operating rod (37) is abutted against the inclined surface of the wedge-shaped block (39), and the other end of the operating rod (37) is connected with the operating plate (36).

6. The pneumatic diaphragm double-seat adjusting valve with high sealing performance as claimed in claim 5, wherein the operating rod (37) is sleeved with a second spring (38), and two ends of the second spring (38) are respectively connected with the operating plate (36) and the outer wall of the mounting block (15).

7. The operation of the high-sealing pneumatic diaphragm double seat regulating valve according to claim 6, wherein the operation of the pneumatic diaphragm double seat regulating valve comprises the following steps:

s1, installing a slide rod (26) in a hollow tube (24), enabling the slide rod (26) to move along a fixed disc (23) and a fixed plate (27), driving a connecting plate (31) to move towards a direction far away from the fixed plate (27), enabling the fixed block (25) to be contracted into a limiting groove (28) through a movable rod (29) by the connecting plate (31), enabling a first spring (30) to be in an extension state, aligning mounting holes of a second flange (21) on a liquid inlet pipe (19) and a liquid outlet pipe (20) with the hollow tube (24) and inserting the mounting holes along the hollow tube (24), enabling the first flange (17) to be tightly abutted against the second flange (21) through a sealing gasket (18), releasing external force on the slide rod (26), enabling the fixed block (25) to extend out of the hollow tube (24) under the action of restoring force of the first spring (30), and clamping and fixing the first flange (17) and the second flange (21), the installation work of the valve body (1), the liquid inlet pipe (19) and the liquid outlet pipe (20) is completed;

s2, the operating plate (36) is pressed towards the direction of the mounting block (15), so that the operating rod (37) pushes the wedge-shaped block (39) to move towards the direction away from the insertion hole (34), the pin block (40) is moved out of the pin hole (33) on the insertion rod (32) and is retracted into the mounting groove (35), meanwhile, the second spring (38) and the third spring (41) are in a compressed state, the upper protective cover (14) is taken down from the lower protective cover (13), and the actuating mechanism (16) in the lower protective cover (13) is maintained.