A high-pressure flow control valve

Abstract

The present invention discloses a high-pressure regulating flow valve, comprising a high-pressure regulating flow valve body, a sample water flow control part and an over-pressure flow reducing part, the over-pressure flow reducing part being arranged behind the sample water flow control part, and controlling the flow and reversely controlling the flow and pressure through the combination of the sample water flow control part and the over-pressure flow reducing part; the high-pressure regulating flow valve body comprises a valve seat, a valve cavity, an inlet part and an outlet part, wherein the valve seat is provided with a regulating cavity, the inlet part and the outlet part are arranged on both sides of the valve cavity, the inlet part is connected with the valve cavity through the valve seat, the sample water flow control part is arranged at one end of the valve seat perpendicular to the valve cavity, and the over-pressure flow reducing part is arranged in the valve cavity; the over-pressure flow reducing part comprises a plurality of high-pressure convection regulating modules, a convection filling module and a convection sealing module, and the over-pressure flow reducing part is installed in the valve cavity; the high-pressure convection regulating module is installed in the interior of the valve cavity in the positive direction, and a convection filling module is used to supplement the module if the number is less than the predetermined number, and a convection sealing module is used at the end away from the valve seat for overall sealing.

Description

Technical Field

[0001] The present invention belongs to the field of fluid mechanics and valve body technology, and in particular relates to a high-pressure flow control valve based on the principles of high-pressure water vortex and convection. Background Art

[0002] Pressure reducing valves for water vapor sampling systems are primarily used in boiler water sampling systems that handle high-temperature, high-pressure water samples. By reducing the sample flow gap or threaded grooves within the valve, they reduce the sample flow rate and pressure, thereby reducing the sample flow rate and pressure. The valve opening is adjusted using a handwheel. A wider opening increases the pressure and flow at the valve outlet; a narrower opening decreases the pressure and flow. A typical pressure reducing valve can maintain an outlet pressure reduction between 0.01 and 0.8 MPa at an inlet pressure of 3-32 MPa.

[0003] However, traditional water vapor sampling system pressure reducing valves primarily use double-needle or threaded groove pressure reducing valves, which have small valve clearances and are prone to clogging. As the valve opening increases, the flow rate and pressure of the sample water at the pressure reducing valve outlet continuously increase. When the opening is too large, the sample water flow rate is excessive, exceeding 3000ml / min and the pressure exceeds the safety pressure of 0.8MPa. This can lead to excessively high sample water temperature and pressure, damaging online instrument sensors and accessories. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure flow control valve. After the flow range is set, the larger the valve opening, the smaller the pressure and flow at the sample water outlet, so that the system will not cause sample water overpressure and / or overcurrent damage to the instrument due to operator misoperation. The high-pressure flow control valve is formed based on the principle of water sample vortex and convection. Through the high-pressure convection regulation module therein, the sample water produces a convection effect based on its own outer flow layer through the vortex rotation and the inner flow layer, reducing the flow of the sample water, thereby achieving reverse control of the high-pressure convection flow. For sample water of different pressures, the number of high-pressure convection regulation modules used is different. The higher the valve inlet pressure, the more high-pressure convection regulation modules need to be used.

[0005] The present invention provides a high-pressure flow control valve, comprising a high-pressure flow control valve body, a sample water flow control portion, and an overpressure flow reduction portion. The overpressure flow reduction portion is arranged behind the sample water flow control portion, and the sample water flow control portion and the overpressure flow reduction portion are combined to control the flow rate and reversely control the flow rate and pressure; wherein:

[0006] The high-pressure flow regulating valve body comprises a valve seat (12), a valve cavity (10), an inlet portion and an outlet portion, wherein the valve seat (12) is provided with an adjusting cavity, the inlet portion and the outlet portion are provided on both sides of the valve cavity (10), the inlet portion is communicated with the valve cavity (10) through the valve seat (12), the sample water flow control portion is provided at one end of the valve seat (12) perpendicular to the valve cavity (10), and the overpressure flow reducing portion is provided in the valve cavity (10);

[0007] The overpressure flow reducing portion comprises a plurality of high-pressure convection regulating modules (9), a convection filling module (8) and a convection sealing module (6), and the overpressure flow reducing portion is installed in the valve cavity (10); the high-pressure convection regulating module (9) is installed in the positive direction into the interior of the valve cavity (10), and if the number of the high-pressure convection regulating modules (9) is less than the predetermined number, the convection filling module (8) is used to supplement it, and the convection sealing module (6) is used to seal the entire portion at the end away from the valve seat (12).

[0008] Preferably, the high-pressure convection regulating module (9) is a cylinder, divided into an upper part and a lower part; the convection filling module (8) has the same external dimensions as the high-pressure convection regulating module (9); the aperture of the convection filling module (8) is the same as the outlet aperture of the high-pressure convection regulating module (9), and is used to act on the flow path of the low-pressure sample water to supplement the regulating function of the high-pressure convection regulating module (9); the convection sealing module (6) is made of polytetrafluoroethylene material and seals the installation position, and the size of the convection sealing module (6) is exactly the same as the size of the convection filling module (8).

[0009] Preferably, the sample water flow control part is used to accurately control the flow rate, and includes a flow regulating ejector pin (15), a packing gland (16), a packing baffle (19), a packing gland nut (7), a handwheel (13) and a handwheel locking nut (14); wherein the flow regulating ejector pin (15) is threadedly mounted in the regulating cavity of the valve seat (12), and a packing seal is used between the middle section of the flow regulating ejector pin (15) and the valve seat (12); the packing baffle (19) and the packing gland (16) are respectively arranged on both sides of the packing; the packing gland nut (7) is screwed onto the valve seat (12) and presses the packing gland (16); the end of the flow regulating ejector pin (15) is positioned and fixed by the handwheel (13), and the outer side of the handwheel (13) is positioned and fixed by the handwheel locking nut (14).

[0010] Preferably, the packing gland (16) is a hollow cylinder; the inner side of the packing gland nut (7) is a cavity provided with a full-length thread and communicated with the through hole, and the outer side of the packing gland nut (7) is an external hexagon; the handwheel (13) is a plum blossom-shaped handle; and the handwheel locking nut (14) is an M6 cap nut.

[0011] Preferably, it also includes fasteners, seals and welded joints; wherein:

[0012] The fastener includes a clamping joint, a pressure cap and a clamping nut.

[0013] The clamping joint comprises an inlet clamping joint (20) and an outlet clamping joint (1);

[0014] The pressure cap comprises a water outlet pressure cap (5), the water outlet pressure cap (5) being an internal thread structure, the internal thread size being consistent with the thread size of the tail portion of the valve cavity (10), the water outlet pressure cap (5) being threadedly connected to the tail portion of the valve cavity (10) and being used to compress the convection sealing module (6), thereby sealing the entire valve cavity (10);

[0015] The clamping nut comprises an inlet clamping nut (22) and an outlet clamping nut (3);

[0016] The sealing element comprises a polytetrafluoroethylene gasket, a filler (11), a filler sealing gasket (17) and an O-ring; the polytetrafluoroethylene gasket comprises an inlet polytetrafluoroethylene gasket (21) and an outlet polytetrafluoroethylene gasket (2);

[0017] The welding joint comprises an inlet joint (18) and an outlet joint (4); an inlet clamping joint (20), an inlet clamping nut (22) and an inlet polytetrafluoroethylene gasket (21) are fixed on the inlet joint (18) by threaded installation.

[0018] Preferably, each group of high-pressure convection regulating modules (9) comprises an upper module and a lower module, wherein the contact portion of the upper module and the lower module is provided with an annular groove, and the O-ring is provided in the annular groove for sealing; when assembling the upper and lower modules of each group of high-pressure convection regulating modules (9), the upper module is first installed in the valve cavity (10) in a predetermined direction, and then the lower module is installed; then the upper module of the next group of high-pressure convection regulating modules (9) is installed, and the installation is interlaced in this manner.

[0019] Preferably, one end of the inlet joint (18) is a columnar joint welded to the valve seat (12), and is positioned on the inlet groove of the valve seat (12) by welding the columnar joint; the middle part of the inlet joint (18) is an external hexagonal joint, and the end of the inlet joint (18) is provided with a section of external thread; the front end of the inlet clamping joint (20) is a sealing plane with a waterline, and the rear end is a columnar butt welding joint; the inner side of the inlet clamping nut (22) is a cavity provided with a full section of thread and connected to the through hole, and the outer side of the inlet clamping nut (22) is an external hexagonal joint;

[0020] The front end of the outlet joint (4) is cylindrical and welded to the outlet pressure cap (5). The center of the cylindrical shape is a 4 mm through hole, and the end of the cylindrical shape is an external thread.

[0021] The outlet clamping joint (1) and the outlet clamping nut (3) are respectively consistent in form with the inlet clamping joint (20) and the inlet clamping nut (22).

[0022] Preferably, the valve seat (12) is in the shape of a square tee, the inlet is provided with a first circular groove for welding with the inlet joint (18), the outlet is provided with a second circular groove for inserting the valve cavity into the positioning welding, the inner side of the regulating cavity of the valve seat (12) is provided with an internal thread, the end of the internal thread is provided with a step for installing a fixed packing, the outer side of the regulating cavity is provided with an external thread, and the external thread is used to install a packing gland nut (7).

[0023] Preferably, the front end of the flow regulating ejector pin (15) is conical, and the middle section of the flow regulating ejector pin (15) is provided with an external thread connected to the valve seat (12).

[0024] Preferably, the filler (11) is a graphite filler.

[0025] The valve provided by the present invention has the following beneficial technical effects:

[0026] (1) The high-pressure convection regulation module adopts a sample water vortex convection design. The higher the sample water pressure, the lower the outlet flow. It can only be used under normal flow conditions, avoiding damage to accessories and instruments caused by human operation such as pipeline overpressure or overflow.

[0027] (2) In addition to the pressure control function, it also has the function of accurately controlling the flow rate, accurately positioning the flow rate of each sample water, requiring little maintenance, and also has a protective function.

[0028] (3) The valve aperture is large, no sedimentation, no clogging.

[0029] (4) It can flexibly use different numbers of high-pressure convection regulating modules to control the flow rate for different pressure water samples. After the first debugging, it can be maintenance-free, reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of the overall structure of a high-pressure flow regulating valve according to a preferred embodiment of the present invention;

[0031] Figure 2 According to the preferred embodiment of the present invention Figure 1 Schematic diagram of sample water flow direction in the overpressure flow reduction part of the medium and high pressure regulating flow valve;

[0032] Figure 3 Schematic diagram of sample water flow direction of the flow control part according to a preferred embodiment of the present invention;

[0033] Figure 4Schematic diagram of the dimensions of a high-pressure convection regulation module (upper module) according to a preferred embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the dimensions of a high-pressure convection regulation module (lower module) according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0036] like Figure 1-3 As shown, the high-pressure flow control valve provided in this embodiment has a flow range set. The larger the valve opening, the smaller the pressure and flow at the sample water outlet. This prevents the system from causing sample water overpressure and / or overcurrent damage to the instrument due to operator misoperation. The high-pressure flow control valve is formed based on the principle of water sample vortex and convection. Through the high-pressure convection regulating module therein, the sample water generates a convection effect based on its own outer flow layer through the vortex rotation and the inner flow layer, reducing the flow of the sample water, thereby achieving reverse control of the high-pressure convection flow. For sample water of different pressures, the number of high-pressure convection regulating modules used is different. The higher the valve inlet pressure, the more high-pressure convection regulating modules need to be used.

[0037] This embodiment provides a high-pressure flow control valve, comprising a high-pressure flow control valve body, a sample water flow control portion, and an overpressure flow reduction portion. The overpressure flow reduction portion is disposed after the sample water flow control portion, and the sample water flow control portion and the overpressure flow reduction portion are combined to control the flow rate and reversely control the flow rate and pressure.

[0038] The main body of the high-pressure flow regulating valve includes a valve seat 12, a valve cavity 10, an inlet and an outlet, wherein the valve seat 12 is provided with a regulating cavity, the inlet and the outlet are provided on both sides of the valve cavity 10, the inlet is connected with the valve cavity 10 through the valve seat 10, the valve seat 12 is perpendicular to one end of the valve cavity 10 to provide the sample water flow control part, and the overpressure flow reducing part is provided in the valve cavity 10.

[0039] In this embodiment, the valve seat 12 and the valve chamber 10 are welded together, and the high-pressure flow regulating valve first controls the adjustment pressure and then fixes the adjustment flow.

[0040] In this embodiment, the outlet is 20-35% larger than the inlet. The inlet is a high-pressure portion with a 3mm aperture, while the outlet is a low-pressure portion with a 4mm aperture. The above numerical configuration allows for better control of fluid pressure and flow from a structural perspective.

[0041] As a preferred embodiment, the overpressure flow reducing portion includes a plurality of high-pressure convection regulating modules 9, a convection filling module 8 and a convection sealing module 6, and the overpressure flow reducing portion is installed in the valve cavity 10; the high-pressure convection regulating module 9 is installed in the positive direction into the interior of the valve cavity 10, and the convection filling module 8 is used to supplement the number of modules that is less than the predetermined number, and the convection sealing module (6) is used at the end away from the valve seat 12 for overall sealing.

[0042] In this embodiment, the number less than 20 is supplemented with a flow regulating filling module 8, and the last end position adopts a convection sealing module 6. The outlet pressure cap 5 is installed at the tail of the valve cavity 10 in a threaded installation manner and presses the convection sealing module 6.

[0043] In this embodiment, the high-pressure convection regulation module 9 is a cylinder, divided into two parts, an upper part and a lower part; the convection filling module 8 has the same outer dimensions as the high-pressure convection regulation module 9, and the aperture of the convection filling module 8 is the same as the outlet aperture of the high-pressure convection regulation module 9, and is used to act on the flow path of the low-pressure sample water to supplement the regulating effect of the high-pressure convection regulation module 9; the convection sealing module 6 is made of polytetrafluoroethylene and seals the installation position, and the size of the convection sealing module 6 is exactly the same as the size of the convection filling module 8.

[0044] As a preferred embodiment, the sample water flow control part is used to precisely control the flow rate, including a flow regulating ejector pin 15, a packing gland 16, a packing baffle 19, a packing gland nut 7, a handwheel 13 and a handwheel locking nut 14; wherein the flow regulating ejector pin 15 is threadedly installed in the regulating cavity of the valve seat 12, and a packing seal is used between the middle section of the flow regulating ejector pin 15 and the valve seat 12; the packing baffle 19 and the packing gland 16 are respectively arranged on both sides of the packing; the packing gland nut 7 is screwed onto the valve seat 12 and presses the packing gland 16; the end of the flow regulating ejector pin 15 is positioned and fixed by the handwheel 13, and the outer side of the handwheel 13 is positioned and fixed by the handwheel locking nut 14.

[0045] In this embodiment, the packing sealing process includes: first installing the packing baffle 19, then filling the packing to prevent the packing from entering the regulating chamber along the thread and being consumed; then installing the packing gland 16 to compress the packing; finally, screwing the packing gland nut 7 onto the valve seat 12 and compressing the packing gland 16.

[0046] In this embodiment, the packing gland 16 is a hollow cylinder; the inner side of the packing gland nut 7 is a cavity with a full-length thread and is connected to the through hole, and the outer side of the packing gland nut 7 is an external hexagon; the handwheel 13 is a plum blossom-shaped handle; and the handwheel locking nut 14 is an M6 cap nut.

[0047] As a preferred embodiment, it also includes fasteners, seals and welded joints; wherein:

[0048] (1) The fastener includes a clamping joint, a pressure cap and a clamping nut.

[0049] A. The clamping joint includes an inlet clamping joint 20 and an outlet clamping joint 1;

[0050] B. The pressure cap includes an outlet pressure cap 5 , which has an internal thread structure. The internal thread size is consistent with the thread size of the rear end of the valve cavity 10 . The outlet pressure cap 5 is threadedly connected to the rear end of the valve cavity 10 to compress the convection sealing module 6 , thereby sealing the entire valve cavity 10 .

[0051] C. The clamping nut includes an inlet clamping nut 22 and an outlet clamping nut 3;

[0052] The sealing components include a PTFE gasket, packing, and an O-ring (not shown). The PTFE gaskets include an inlet PTFE gasket 21 and an outlet PTFE gasket 2. In this embodiment, the packing 11 is graphite, but those skilled in the art will appreciate that any suitable type of packing can be used for sealing. Each set of high-pressure convection regulation modules 9 comprises an upper module and a lower module, wherein the contact portion of the upper and lower modules is provided with an annular groove, and the O-ring is positioned within the annular groove for sealing. When assembling the upper and lower modules of each set of high-pressure convection regulation modules 9, the upper module is first installed in the valve cavity 10 in a predetermined direction (in this embodiment, forward), followed by the lower module. The upper module of the next set of high-pressure convection regulation modules 9 is then installed, and the installation continues in this interleaved manner. The number of high-pressure convection modules used for different pressure levels of sample water varies, with higher pressures requiring more modules, up to a maximum of 20 modules, with the 21st module using the convection sealing module 6.

[0053] The welding joint includes an inlet joint 18 and an outlet joint 4; an inlet clamping joint 20, an inlet clamping nut 22 and an inlet PTFE gasket 21 are fixed to the inlet joint 18 by threaded installation.

[0054] In this embodiment, one end of the inlet connector 18 is a cylindrical connector welded to the valve seat 12 and positioned on the inlet groove of the valve seat 12 by welding the cylindrical connector. The middle portion of the inlet connector 18 is an external hexagonal connector, and the end of the inlet connector 18 is provided with a section of external thread. The front end of the inlet clamping connector 20 is a sealing plane with a waterline, and the rear end is a cylindrical butt welded connector. The inner side of the inlet clamping nut 22 is a cavity with a full section of thread and is connected to the through hole. The outer side of the inlet clamping nut 22 is an external hexagonal connector.

[0055] The front end of the outlet connector 4 is cylindrical and welded to the outlet pressure cap 5. The center of the cylindrical shape is a 4mm through hole, and the end of the cylindrical shape is an external thread.

[0056] The outlet clamping joint 1 and the outlet clamping nut 3 are respectively consistent in form with the inlet clamping joint 20 and the inlet clamping nut 22 .

[0057] As a preferred embodiment, the valve seat 12 is in a square tee shape, the inlet is provided with a first circular groove for welding with the inlet joint 18, the outlet is provided with a second circular groove for inserting the valve cavity into the positioning welding, and the inner side of the regulating cavity of the valve seat 12 is provided with an internal thread, the end of the internal thread is provided with a step for installing a fixed packing, and the outer side of the regulating cavity is provided with an external thread, and the external thread is used to install the packing gland nut 7.

[0058] As a preferred embodiment, the front end of the flow regulating ejector pin 15 is conical, the diameter of the thin end of the cone is 2 mm, the diameter of the thick end of the cone is 3.2 mm, and the effective adjustment length of the flow regulating ejector pin 15 is 10 mm; the middle section of the flow regulating ejector pin 15 is provided with an external thread connected to the valve seat 12.

[0059] In this preferred embodiment, Figure 4 , Figure 5 As shown, the inlet diameter e is 1.5 to 2 times the outlet diameter d, the angle a ranges from 15 degrees ≤ a ≤ 30 degrees, the vortex space diameter b ranges from d ≤ b ≤ 2.5d, and the diameter f of the interface between the upper and lower modules in the upper module is equal to the diameter g in the lower module. The high-pressure convection regulation module 9 adopts a vortex convection design, with a bottle-mouth-shaped interior and a gradually widening inlet space, embracing a semi-circular ring design at its deepest point. After sample water enters the inlet, the outer layer of the water flow disperses along the inner wall of the valve chamber 10. After swirling through the vortex, it partially offsets the head pressure with the middle portion of the water flow, maximizing the head loss. The higher the pressure, the greater the average head pressure loss. After the operation of multiple high-pressure convection regulation modules 9, the flow rate reaches an upper limit within the acceptable pressure range. The ultimate adjustment target: When the sample water pressure at the inlet of the first high-pressure convection regulation module 9 is adjusted to 0.2-0.3 MPa, the flow rate reaches its maximum limit (2500ml-3000ml / min).

[0060] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such changes and modifications as fall within the scope of the claims and their equivalents.

Claims

1. A high pressure flow control valve, characterized in that: It includes a high-pressure flow control valve body, a sample water flow control part and an overpressure flow reduction part. The overpressure flow reduction part is arranged after the sample water flow control part, and the sample water flow control part and the overpressure flow reduction part are combined to control the flow and reversely control the flow and pressure; wherein: The high-pressure flow regulating valve body comprises a valve seat (12), a valve cavity (10), an inlet portion and an outlet portion, wherein the valve seat (12) is provided with a regulating cavity, the inlet portion and the outlet portion are provided on both sides of the valve cavity (10), the inlet portion is communicated with the valve cavity (10) through the valve seat (12), the sample water flow control portion is provided at one end of the valve seat (12) perpendicular to the valve cavity (10), and the overpressure flow reducing portion is provided in the valve cavity (10); The overpressure flow reducing portion comprises a plurality of high-pressure convection regulating modules (9), a convection filling module (8) and a convection sealing module (6), and the overpressure flow reducing portion is installed in the valve cavity (10); the high-pressure convection regulating module (9) is installed in the positive direction into the interior of the valve cavity (10), and the convection filling module (8) is used to supplement the number of modules that is less than the predetermined number, and the convection sealing module (6) is used to seal the entire module at the end away from the valve seat (12); The high-pressure convection regulating module (9) is a cylinder, divided into an upper part and a lower part; the convection filling module (8) and the high-pressure convection regulating module (9) have the same external dimensions, and the aperture of the convection filling module (8) is the same as the outlet aperture of the high-pressure convection regulating module (9), and is used to act on the flow path of the low-pressure sample water to supplement the regulating function of the high-pressure convection regulating module (9); the convection sealing module (6) is made of polytetrafluoroethylene and seals the installation position, and the size of the convection sealing module (6) is exactly the same as the size of the convection filling module (8); The sample water flow control part is used to accurately control the flow rate, and includes a flow regulating thimble (15), a packing gland (16), a packing baffle (19), a packing gland nut (7), a handwheel (13) and a handwheel locking nut (14); wherein the flow regulating thimble (15) is threadedly mounted in the regulating cavity of the valve seat (12), and a packing seal is used between the middle section of the flow regulating thimble (15) and the valve seat (12); the packing baffle (19) and the packing gland (16) are respectively arranged on both sides of the packing; the packing gland nut (7) is screwed onto the valve seat (12) and presses the packing gland (16); the end of the flow regulating thimble (15) is positioned and fixed by the handwheel (13), and the outer side of the handwheel (13) is positioned and fixed by the handwheel locking nut (14); Each set of high-pressure convection regulating modules (9) comprises an upper module and a lower module, wherein the contact portion of the upper module and the lower module is provided with an annular groove, and an O-ring is provided in the annular groove for sealing; when assembling the upper and lower modules of each set of high-pressure convection regulating modules (9), the upper module is first installed in the valve cavity (10) in a predetermined direction, and then the lower module is installed; then the upper module of the next set of high-pressure convection regulating modules (9) is installed, and the installation is interleaved in this manner.

2. A high pressure flow control valve according to claim 1, characterized in that: The packing gland (16) is a hollow cylinder; the inner side of the packing gland nut (7) is a cavity provided with a full-length thread and communicated with the through hole; the outer side of the packing gland nut (7) is an external hexagonal; the handwheel (13) is a plum blossom-shaped handle; and the handwheel locking nut (14) is an M6 cap nut.

3. A high pressure flow control valve according to claim 2, characterized in that: Also includes fasteners, seals and welded joints; where: The fastener includes a clamping joint, a pressure cap and a clamping nut. The clamping joint comprises an inlet clamping joint (20) and an outlet clamping joint (1); The pressure cap comprises a water outlet pressure cap (5), the water outlet pressure cap (5) being an internal thread structure, the internal thread size being consistent with the thread size of the tail end of the valve cavity (10), the water outlet pressure cap (5) being threadedly connected to the tail end of the valve cavity (10) and being used to compress the convection sealing module (6), thereby sealing the entire valve cavity (10); The clamping nut comprises an inlet clamping nut (22) and an outlet clamping nut (3); The sealing element comprises a PTFE pad, a filler and an O-ring; the PTFE pad comprises an inlet PTFE pad (21) and an outlet PTFE pad (2); The welding joint comprises an inlet joint (18) and an outlet joint (4); an inlet clamping joint (20), an inlet clamping nut (22) and an inlet PTFE gasket (21) are fixed to the inlet joint (18) by threaded installation.

4. A high pressure flow control valve according to claim 3, characterized in that: One end of the inlet joint (18) is a columnar joint welded to the valve seat (12), and is positioned on the inlet groove of the valve seat (12) by welding the columnar joint; the middle part of the inlet joint (18) is an external hexagonal joint, and the end of the inlet joint (18) is provided with a section of external thread; the front end of the inlet clamping joint (20) is a sealing plane with a waterline, and the rear end is a columnar butt welding joint; the inner side of the inlet clamping nut (22) is a cavity provided with a full section of thread and connected to the through hole, and the outer side of the inlet clamping nut (22) is an external hexagonal joint; The front end of the outlet joint (4) is cylindrical and welded to the outlet pressure cap (5). The center of the cylindrical shape is a 4 mm through hole, and the end of the cylindrical shape is an external thread. The outlet clamping joint (1) and the outlet clamping nut (3) are respectively consistent in form with the inlet clamping joint (20) and the inlet clamping nut (22).

5. A high pressure flow control valve according to claim 4, characterized in that: The valve seat (12) is in the shape of a square tee, with a first circular groove provided at the inlet for welding with the inlet joint (18), and a second circular groove provided at the outlet for inserting the valve cavity into the positioning welding. An internal thread is provided on the inner side of the regulating cavity of the valve seat (12), and a step is provided at the end of the internal thread for installing a fixed packing. An external thread is provided on the outer side of the regulating cavity, and the external thread is used to install a packing gland nut (7).

6. A high pressure flow control valve according to claim 5, characterized in that: The front end of the flow regulating ejector pin (15) is tapered, and the middle section of the flow regulating ejector pin (15) is provided with an external thread connected to the valve seat (12).

7. The high-pressure flow control valve according to claim 3, characterized in that: The filler (11) is a graphite filler.

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