Regulating valve

Abstract

The utility model relates to a regulating valve, and relates to the technical field of valves, the regulating valve comprises a valve body, a valve rod and a valve cover installed on the valve body, a valve clack connected with one end of the valve rod is arranged in the valve body, the other end of the valve rod penetrates through the valve body and then is connected with a driving assembly, a valve seat matched with the valve clack is arranged in the valve body, and the valve cover is connected with the valve clack. A protective lining layer is fixed on the inner wall of the valve body through a lining process; a plurality of strip-shaped fixing nets are arranged in the valve body, and fixing grooves allowing the strip-shaped fixing nets to be placed and fixed are formed in the inner wall of the valve body. As the strip-shaped fixing net and the fixing groove are arranged in a matched mode, when the protective lining layer is fixed to the inner wall of the valve body, the strip-shaped fixing net is fixed into the fixing groove in advance, then the protective lining layer is fixed into the valve body through glue, and the strip-shaped fixing net in the fixing groove is filled with the glue; therefore, the influence on the protective lining during negative pressure operation of the regulating valve is reduced, and the bonding force between the protective lining and the inner wall of the valve body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a regulating valve. Background Art

[0002] Pneumatic diaphragm control valve is a control valve commonly used in industrial fluid control systems. It controls the flow of fluid by driving the diaphragm through air pressure. The diaphragm control valve has the characteristics of small size, simple structure and high reliability. It is widely used in chemical, petroleum, energy, papermaking and other fields.

[0003] In the related technology, the publication number is CN201202828Y, a pneumatic diaphragm regulating valve, including a valve body, a valve disc is arranged in the valve body, a valve cover is connected to the valve body, the valve disc is connected to the valve stem, the other end of the valve stem is connected to the pneumatic diaphragm device, a valve seat is arranged in the valve body, the cross-section of the valve seat is "T"-shaped, the top surface of the valve seat is the second sealing surface, and the hole wall of the valve seat is the first sealing surface; the lower cross-section of the valve disc is "T"-shaped, the contact surface between the valve disc and the hole wall of the valve seat is the first sealing surface, the contact surface between the valve disc and the top surface of the valve seat is the second sealing surface, and a sealing device is provided on the contact surface between the valve disc and the top surface of the valve seat.

[0004] When the above-mentioned control valve conveys corrosive fluids, in order to prevent the medium from corroding the inner wall of the valve body, a PTFE lining is usually bonded to the inner wall of the valve body through a lining process (hot melt). The PTFE lining is made of FEP / PFA and has excellent corrosion resistance. In order to prevent the control valve from spreading to the surrounding environment in the event of leakage or failure, the pipeline system usually adopts negative pressure operation to form a pressure difference to prevent the medium from overflowing.

[0005] When the pipeline is under negative pressure, the pressure inside the pipeline is lower than the external atmospheric pressure, and the air or other gases in the pipeline will be sucked into the pipeline. When the pipeline flows, the sucked air will flow at a higher speed, generating velocity shear force. This velocity shear force may exceed the bonding strength between the PTFE lining and the inner wall of the valve body, causing the PTFE lining bonded to the inner wall of the valve body to produce bubbles, reducing the adhesion effect between the PTFE lining and the inner wall of the valve body. If the time is too long, the PTFE lining may fall off from the inner wall of the valve body, causing the corrosive medium to directly corrode the inner wall of the valve body. There is room for improvement. Utility Model Content

[0006] The purpose of the present application is to provide a regulating valve to solve the problem in the above-mentioned related technologies that, since the regulating valve is operated under negative pressure conditions when it is applied to a pipeline, flow shear force will be generated, and this flow velocity shear force may exceed the bonding strength between the polyfluoro lining and the inner wall of the valve body, causing the polyfluoro lining bonded to the inner wall of the valve body to produce bubbles, thereby reducing the bonding effect of the polyfluoro lining and the inner wall of the valve body. If the time is too long, the polyfluoro lining may fall off from the inner wall of the valve body, thereby causing the corrosive medium to directly corrode the inner wall of the valve body.

[0007] The present application provides a regulating valve adopting the following technical solution:

[0008] A regulating valve comprises a valve body, a valve stem and a valve cover installed on the valve body, wherein a valve disc connected to one end of the valve stem is provided inside the valve body, and the other end of the valve stem passes through the valve body and is connected to a drive assembly, a valve seat cooperating with the valve disc is provided inside the valve body, and a protective lining is fixed on the inner wall of the valve body by a lining process; a plurality of strip-shaped fixing nets are provided inside the valve body, and a fixing groove for the strip-shaped fixing nets to be placed and fixed is opened on the inner wall of the valve body.

[0009] By adopting the above technical solution, when the protective lining is fixed to the inner wall of the valve body, due to the coordinated arrangement of the strip fixing net and the fixing groove, the strip fixing net is welded and fixed to the inside of the fixing groove in advance, and then the protective lining is fixed to the inside of the valve body through the lining process. During the fixing process, a part of the protective lining itself will melt and fill the strip fixing net in the fixing groove, so that the adhesion between the protective lining and the inner wall of the valve body is more firm, thereby reducing the impact of the negative pressure operation of the regulating valve on the protective lining and improving the bonding force between the protective lining and the inner wall of the valve body.

[0010] Optionally, a plurality of guide blocks for limiting the valve disc are provided on the inner wall of the protective lining along the length direction of the valve stem.

[0011] By adopting the above technical solution, during the movement of the valve flap, due to the limiting setting of the guide block on the valve flap, the outer peripheral surface of the valve flap abuts against one side of the guide block during the movement, thereby improving the stability of the valve flap during the movement along the length direction of the valve stem.

[0012] Optionally, the valve cover comprises a middle cover fixed on the valve body and an upper cover fixed on the middle cover, and the middle cover and the upper cover are respectively provided with a first through hole and a second through hole for the valve stem to pass through.

[0013] By adopting the above technical solution, due to the installation arrangement of the upper cover and the middle cover, the valve cover is arranged separately. When the upper cover of the valve cover fails, only the upper cover needs to be disassembled and assembled separately, which is convenient for the subsequent disassembly and assembly of the regulating valve.

[0014] Optionally, a fixing boss is provided on the side of the middle cover away from the upper cover, and a third through hole for the valve stem to pass through is formed on the fixing boss.

[0015] By adopting the above technical solution, a fixed boss is fixedly arranged on the side of the middle cover away from the upper cover, and a third through hole for the valve stem to pass through is opened on the protective lining, so that the valve stem is further protected by the fixed boss, reducing the impact and corrosion of the valve stem during the circulation of the medium.

[0016] Optionally, a corrugated protective tube is sleeved on the outer circumference of the valve stem, one end of the corrugated protective tube is fixedly connected to the valve stem, and the other end of the corrugated protective tube passes through the upper cover and is fixedly connected to the upper cover.

[0017] By adopting the above technical solution, due to the installation of the corrugated protective tube, the corrugated protective tube is installed and sleeved on the outer peripheral surface of the valve stem, so as to protect the valve stem and reduce the corrosion of the valve stem by corrosive media.

[0018] Optionally, a corrugated protrusion is provided on the outer peripheral surface of the end of the corrugated protection tube away from the valve disc, and an annular groove for the corrugated protrusion to be embedded is opened on the opening edge of the first through hole close to the upper cover on the middle cover.

[0019] By adopting the above technical solution, when the corrugated protective tube and the upper cover are assembled and fixed, due to the matching arrangement of the corrugated protrusion and the annular groove, the corrugated protrusion is fixed inside the corresponding annular groove, thereby realizing the assembly and fixation of the upper cover and the corrugated protective tube and achieving its assembly stability.

[0020] Optionally, a protective cover covering the middle cover and the fixing boss is provided on the side of the middle cover away from the upper cover.

[0021] By adopting the above technical solution, due to the covering arrangement of the protective cover on the centering cover and the fixed boss, the corrosion of the centering cover and the fixed boss by corrosive media is reduced, and the protection of the fixed boss and the center cover is improved.

[0022] Optionally, the opening edge of the valve body close to the middle cover is provided with a mounting recessed groove for the outer edge of the protective cover to be placed in.

[0023] By adopting the above technical solution, due to the setting of the installation groove, during the assembly process of the protective cover, the outer edge of the protective cover is placed in the installation groove, and then the middle cover is fixed on the valve body, thereby realizing the assembly and fixation of the protective cover.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Due to the coordinated setting of the strip-shaped fixed net and the fixed groove, when the protective lining is fixed to the inner wall of the valve body, the strip-shaped fixed net is fixed inside the fixed groove in advance, and then the protective lining is fixed to the inside of the valve body through the lining process. During the fixing process, a part of the protective lining itself will melt and fill the strip-shaped fixed net in the fixed groove, making the adhesion between the protective lining and the inner wall of the valve body more firm, thereby reducing the impact of the negative pressure operation of the regulating valve on the protective lining and improving the bonding force between the protective lining and the inner wall of the valve body.

[0026] 2. Due to the installation arrangement of the upper cover and the middle cover, the valve cover is set separately. When the upper cover of the valve cover fails, only the upper cover needs to be disassembled and assembled separately, which is convenient for the subsequent disassembly and assembly of the regulating valve; in addition, during the installation of the bellows protective tube, compared with the integrated setting of the valve cover which can only enlarge the diameter of the bellows and fix it at the connection between the valve cover and the valve body, the split valve cover can fix the bellows protective tube at the connection between the upper cover and the middle cover, thereby reducing the material cost of the bellows protective tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0029] Figure 2 It is a partial cross-sectional structural schematic diagram of the valve flap installation and coordination in the embodiment of the present application;

[0030] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0031] Figure 4 yes Figure 2 A magnified schematic diagram of part B;

[0032] Figure 5 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the protective lining in the embodiment of the present application;

[0033] Figure 6 yes Figure 5 Enlarged schematic diagram of part C.

[0034] In the figure, 1, valve body; 11, valve seat; 12, mounting groove; 13, fixing groove; 2, valve stem; 3, valve cover; 31, upper cover; 311, second through hole; 32, middle cover; 321, first through hole; 322, annular groove; 33, fixing boss; 331, third through hole; 34, protective cover; 341, protective seat; 4, valve disc; 5, drive assembly; 6, protective lining; 61, guide block; 7, corrugated protective tube; 71, corrugated protrusion; 8, strip fixing net. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0036] Example:

[0037] Reference Figure 1 and Figure 2 A regulating valve comprises a valve body 1, a valve stem 2 and a valve cover 3 installed on the valve body 1, wherein a valve disc 4 connected to one end of the valve stem 2 is provided inside the valve body 1, the other end of the valve stem 2 passes through the valve body 1 and is connected to a driving assembly 5, a valve seat 11 matched with the valve disc 4 is provided inside the valve body 1, and a protective lining 6 for preventing the medium from corroding the inner wall of the valve body 1 is fixed on the inner wall of the valve body 1 through a lining process, wherein the protective lining 6 is made of FEP or PFA and has good corrosion resistance; the driving assembly 5 drives the valve disc 4 to move back and forth in a direction close to the valve seat 11 through the valve stem 2.

[0038] Reference Figure 1 The driving component 5 is a common pneumatic film driving technology. It uses air supply to drive the film to shrink or expand through the pneumatic driver, thereby driving the valve stem 2 to move. This is a mature driving structure and will not be described in detail here. The lining process is to fix the protective lining 6 on the inner wall of the valve body 1 by hot melting. During hot melting, the protective lining 6 and the inner wall of the valve body 1 need to be heated to soften their surfaces and bond them together. This is a common connection process and will not be described in detail here.

[0039] Reference Figure 2 The valve cover 3 includes an upper cover 31 and a middle cover 32. The middle cover 32 is fixed to the valve body 1 by bolts. The upper cover 31 is fixed to the middle part of the side of the middle cover 32 away from the valve body 1 by bolts. At the same time, the middle cover 32 and the upper cover 31 are provided with a first through hole 321 and a second through hole 311 for the valve stem 2 to pass through. Due to the split setting of the valve cover 3, it is convenient to assemble the regulating valve. A fixed boss 33 is provided on the side of the middle cover 32 away from the upper cover 31. The fixed boss 33 is provided with a third through hole 331 for the valve stem 2 to pass through. In this way, the valve stem 2 is further protected by the fixed boss 33 to reduce the impact of the medium on the valve stem 2.

[0040] Reference Figure 2 and Figure 3 , the outer circumference of the valve stem 2 is sleeved with a bellows protection tube 7, wherein the material of the bellows protection tube 7 is polytetrafluoroethylene; after installation, one end of the bellows protection tube 7 is fixedly connected to the valve stem 2, and the other end of the bellows protection tube 7 passes through the upper cover 31 and is fixedly connected to the upper cover 31, so that the valve stem 2 is protected by the bellows protection tube 7, and the corrosion of the valve stem 2 by the corrosive medium is reduced. The outer circumference of the end of the bellows protection tube 7 away from the valve disc 4 is provided with a corrugated protrusion 71, and the corrugated protrusion 71 is integrally formed with the bellows protection cover 34, and an annular groove 322 for the corrugated protrusion 71 to be embedded is provided on the middle cover 32 at the opening edge of the first through hole 321 close to the upper cover 31, so as to realize the assembly and fixation of the upper cover 31 and the bellows protection tube 7, and achieve its assembly stability.

[0041] Reference Figure 2 and Figure 4 The side of the middle cover 32 away from the upper cover 31 is provided with a protective cover 34 covering the middle cover 32 and the fixed boss 33. The protective cover 34 is also made of polytetrafluoroethylene to reduce the corrosion of the corrosive medium to the middle cover 32 and the fixed boss 33. The opening edge of the valve body 1 close to the middle cover 32 is provided with a mounting groove 12 for the outer edge of the protective cover 34 to be placed.

[0042] Reference Figure 2 and Figure 3 The inner edge of the protective cover 34 is provided with a protective seat 341 bent toward its own axis, and the protective seat 341 is integrally formed with the protective cover 34; when the protective cover 34 is assembled, the protective seat 341 is inserted into the annular groove 322 on the middle cover 32, so as to realize the installation and fixation of the protective cover 34.

[0043] Reference Figure 5 and Figure 6 A plurality of strip-shaped fixed nets 8 are arranged inside the valve body 1. The strip-shaped fixed nets 8 are made of stainless steel. At the same time, a fixing groove 13 is opened on the inner wall of the valve body 1 for the strip-shaped fixed nets 8 to be placed and fixed by welding. The strip-shaped fixed nets 8 are first fixed to the inner wall of the fixing groove 13 by welding, and then the protective lining 6 is fixed to the inner wall of the valve body 1 by a lining process. During the fixing process, a part of the protective lining 6 will melt and fill the gap between the strip-shaped fixed nets 8 and the fixing groove 13, thereby realizing the connection and fixation of the protective lining 6 and the strip-shaped fixed nets 8. By setting the strip-shaped fixed nets 8, the bonding force between the protective lining 6 and the inner wall of the valve body 1 is improved.

[0044] Reference Figure 2 Six guide blocks 61 for limiting the valve flap 4 are fixedly provided on the inner wall of the protective lining 6 along the length direction of the valve stem 2. The length direction of the guide blocks 61 is parallel to the length direction of the valve stem 2, thereby improving the stability of the valve flap 4 during its movement along the length direction of the valve stem 2.

[0045] The implementation principle of the embodiment of the present application is:

[0046] The driving assembly 5 drives the valve disc 4 to move back and forth toward the valve seat 11 through the valve stem 2, so as to control the opening and closing of the regulating valve; due to the coordinated arrangement of the strip-shaped fixed net 8 and the fixed groove 13, the influence of the regulating valve on the protective lining 6 during negative pressure operation is reduced, and the bonding force between the protective lining 6 and the inner wall of the valve body 1 is improved; during the movement of the valve disc 4, the outer peripheral surface of the valve disc 4 abuts against the outer peripheral surface of the guide block 61 away from the protective lining 6, so as to improve the stability of the valve disc 4 during the movement along the length direction of the valve stem 2.

[0047] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A regulating valve, comprising a valve body (1), a valve stem (2) and a valve cover (3) mounted on the valve body (1); a valve flap (4) connected to one end of the valve stem (2) is provided inside the valve body (1); the other end of the valve stem (2) passes through the valve body (1) and is connected to a drive assembly (5); a valve seat (11) matched with the valve flap (4) is provided inside the valve body (1); a protective lining layer (6) is fixed on the inner wall of the valve body (1) by a lining process; It is characterized in that A plurality of strip-shaped fixing nets (8) are arranged inside the valve body (1), and a fixing groove (13) for the strip-shaped fixing nets (8) to be placed and fixed is provided on the inner wall of the valve body (1).

2. A regulating valve according to claim 1, characterized in that: A plurality of guide blocks (61) for limiting the position of the valve flap (4) are provided on the inner wall of the protective lining (6) along the length direction of the valve stem (2).

3. A regulating valve according to claim 1, characterized in that: The valve cover (3) comprises a middle cover (32) fixed on the valve body (1) and an upper cover (31) fixed on the middle cover (32), and the middle cover (32) and the upper cover (31) are respectively provided with a first through hole (321) and a second through hole (311) for the valve stem (2) to pass through.

4. A regulating valve according to claim 3, characterized in that: A fixing boss (33) is provided on the side of the middle cover (32) away from the upper cover (31), and a third through hole (331) for the valve stem (2) to pass through is formed on the fixing boss (33).

5. A regulating valve according to claim 3, characterized in that: The outer circumferential surface of the valve stem (2) is sleeved with a corrugated protective tube (7), one end of the corrugated protective tube (7) is fixedly connected to the valve stem (2), and the other end of the corrugated protective tube (7) passes through the upper cover (31) and is fixedly connected to the upper cover (31).

6. A regulating valve according to claim 5, characterized in that: The outer peripheral surface of the end of the corrugated protection tube (7) away from the valve flap (4) is provided with a corrugated protrusion (71), and the middle cover (32) is provided with an annular groove (322) for the corrugated protrusion (71) to be embedded in the opening edge of the first through hole (321) close to the upper cover (31).

7. A regulating valve according to claim 3, characterized in that: A protective cover (34) covering the middle cover (32) and the fixing boss (33) is provided on the side of the middle cover (32) away from the upper cover (31).

8. A regulating valve according to claim 7, characterized in that: The valve body (1) is provided with a mounting recessed groove (12) at the opening edge close to the middle cover (32) for the outer edge of the protective cover (34) to be placed.

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