High-strength check valve

Abstract

The present invention relates to a high-strength check valve. The valve body is integrally provided with a pipe joint, and by arranging a circular plate covering the sealing boss on the valve plate, when it abuts against the sealing boss, it seals the valve seat, improving the strength of the check valve body while enhancing its sealing performance. The limiting bumps distributed at three corners can position the valve plate during its telescopic movement in the flow cavity, improving stability. The entire structure enables the check valve to stably expand and contract through the limiting bumps to form a flow channel, achieve the check effect through a spring, and achieve central positioning and large-flow diversion through a flow plate. The manufacturing process of the check valve body and the manufacturing process of the check plate are also disclosed. The check valve manufactured using this process has high strength, solving the problems of easy freezing and cracking at low temperatures and low service life of cast check valves. At the same time, it has lower costs, better environmental friendliness, and higher efficiency than the original process, increasing the competitiveness of the enterprise, improving the sealing effect between the check plate and the valve body, and increasing the flow rate of the product.

Description

Technical Field

[0001] The present invention relates to the field of valves, and more particularly to a high-strength check valve. Background Art

[0002] A check valve belongs to an automatic valve, and its main functions are to prevent the backflow of the medium, prevent the pump and the driving motor from reversing, and the discharge of the container medium. The function of this type of valve is to only allow the medium to flow in one direction and prevent the reverse flow.

[0003] A check valve is composed of a valve body, a check plate, a sealing ring and a spring. Among them, the most important valve body is mainly made by casting. However, the valve body and the check plate still have the following defects:

[0004] During the production process of the cast valve body, solid waste and hazardous air pollutants that seriously pollute the environment will be generated. During casting, the air pollution sources are dispersed, with a low concentration and a large volume. Among the total 188 air pollutants listed by the US Environmental Protection Agency, more than 40 have been detected in the casting waste gas, which pose a great threat to the environment and human health, seriously affecting the health of workers and not conforming to the environmental protection policies that China is constantly promoting.

[0005] The cast valve body requires hot processing of the valve, which consumes a large amount of heat energy, and requires a long time to cool after casting. During the casting process, oxide scales are likely to appear on the surface of the valve body, and shot blasting, sandblasting and pickling are required to remove the surface oxide scales. However, the methods for removing oxide scales all have obvious defects. For example, shot blasting and sandblasting have high energy consumption, are not energy-saving and have high costs, and the pickling process is likely to cause serious pollution to the environment. If environmental protection projects are launched, the manufacturing enterprises will have high costs, greatly increasing the production cost and time cost of the valve, and the production efficiency is too low.

[0006] The valve body made by casting has low low-temperature resistance. When used in some special fluids, the valve body is likely to freeze and crack, resulting in valve damage and posing a great safety hazard.

[0007] The valve body made by casting has low strength. After being used for a period of time, it is likely to dry naturally, resulting in a low service life.

[0008] The check plate and the valve body are sealed in a hard-sealing manner to prevent the fluid in the pipeline from flowing back. However, this method has insufficient sealing effect, resulting in fluid backflow of the check valve. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an environmentally friendly check valve with high strength, good sealing performance and environmental protection, as well as a manufacturing process for manufacturing the valve body and check plate of the check valve. The check valve manufactured by this process has high strength, solves the problems of easy freezing and cracking at low temperature and low service life of the cast check valve, and at the same time has lower cost and higher efficiency than the original process, greatly increasing the competitiveness of the enterprise, and improving the sealing effect between the check plate and the valve body.

[0010] To achieve the above object, the present invention provides the following technical solution: a high-strength check valve, including a valve seat, a check plate and a spring. The check plate is arranged in the valve seat. The check plate includes a valve plate and a valve rod. The spring is sleeved on the outer peripheral surface of the valve rod. It is characterized in that: pipeline connectors fixedly arranged or integrally forged with the valve seat are provided at both ends of the valve seat. Pipeline threads are provided on the inner walls of the pipeline connectors. The inner cavities of the valve seat and the two side pipeline connectors are mutually communicated. A sealing plate is provided at one end of the valve seat, and a flow plate is provided at the other end. The sealing plate is provided with a through diameter communicated with the inner cavity of the valve seat. A central hole for the valve rod to pass through is opened in the center of the flow plate. A plurality of flow holes surrounding the central hole are opened on the flow plate. The flow plate is threadedly installed on the valve seat through the pipeline thread and forms a flow cavity for the check plate to reciprocate therein with the sealing plate. At least three limiting bumps surrounding the valve plate are provided on the outer peripheral surface of the valve plate. The valve plate abuts against the inner wall of the flow cavity through the limiting bumps. One end of the spring abuts against the flow plate, and the other end abuts against the valve plate, and urges the valve plate to fit with the sealing plate.

[0011] Adopting the above technical solution, by providing a positive circular plate covering the through diameter of the fixed joint on the valve plate, the valve seat is sealed when it abuts against the sealing plate. The three corner-distributed limiting bumps can position the valve plate when it expands and contracts in the flow cavity, so that it will not tilt and improve stability. At the same time, since the flow plate can be movably installed at one end of the valve seat, the valve body is disassembled into the valve seat, the check plate and the flow plate for batch production, and it is convenient for maintenance and replacement. The fluid can flow from the sealing plate to the flow plate through the flow channel formed by the limiting bumps, and then flow out of the valve body through the flow holes of the flow plate to achieve conduction. The valve rod of the check plate is sleeved with a spring, so that when the valve plate does not receive the impact force at the end without the fixed joint, it can seal the sealing plate. When the fixed joint passes through the fluid, it will drive the spring to deform, so that after the valve rod passes through the central hole, the fluid enters the inside of the valve seat and flows out through the flow holes on the side of the central hole. The whole structure also due to the integrated setting (welding or forging) of the valve seat and the pipeline connector, the check valve only needs to consider the sealing performance between the valve plate and the sealing plate, greatly improving the sealing effect and overall strength of the product. And the check valve realizes the check effect through the spring, realizes the central positioning and rapid assembly through the flow plate, and improves the installation efficiency of the check valve by stably expanding and contracting the limiting bumps in the flow cavity and forming a flow channel.

[0012] The above-mentioned high-strength check valve can be further configured as follows: One end of the outer peripheral surface of the flow plate is bent to form a flow mounting seat, and the flow mounting seat is provided with mounting threads adapted to the pipe threads. The flow plate increases the gap between the central hole and the flow mounting seat through the flow mounting seat, thereby increasing the flow rate of the flow hole.

[0013] Adopting the above technical solution, since the flow plate is installed on the valve body through the pipe threads, the distance between the central hole and the flow mounting seat is the flow rate of the flow hole. The flow plate increases the gap between the central hole and the flow mounting seat through the flow mounting seat, that is, increases the volume of the flow hole, thereby increasing the flow rate of the flow hole.

[0014] The above-mentioned high-strength check valve can be further configured as follows: One end of the sealing plate extending towards the valve plate has a sealing boss, and the valve plate abuts against the sealing boss and covers the through diameter of the sealing boss.

[0015] Adopting the above technical solution, and due to the limiting convex block, the valve plate will not closely fit with the through diameter of the sealing plate when approaching the through diameter of the sealing plate. By providing a sealing boss on the sealing plate, the valve plate only needs to be sealed through the sealing boss, and the fitting angle of the valve plate will not be affected by the limiting convex block, improving the sealing performance.

[0016] The above-mentioned high-strength check valve can be further configured as follows: One end of the valve plate corresponding to the valve stem is provided with a central through hole, the valve stem is provided with a threaded connection portion with a diameter smaller than the inner diameter of the central through hole, the threaded connection portion passes through the central through hole and is connected with a nut, and a sealing ring is provided between the nut and the valve plate.

[0017] Adopting the above technical solution, by opening a central through hole in the center of the valve plate and setting a threaded connection portion with a diameter smaller than the inner diameter of the central through hole on the valve stem, it is avoided that the whole valve stem passes through the central through hole. After the threaded solution portion passes through, a nut is connected to fixedly connect the valve stem and the valve plate. And a sealing ring can be installed between the nut and the valve plate to convert the original hard seal between the valve plate and the movable joint into a soft seal with better sealing effect, improving the sealing performance of the product.

[0018] The above-mentioned high-strength check valve can be further configured as follows: The valve seat and the pipe joints at both ends are integrally formed by a welding process or a forging process. The sealing plate is fixedly connected to the inner wall of the valve seat by a welding process. The number of both the flow holes and the limiting convex blocks is 3.

[0019] With the above technical solution, the valve seat is integrally formed with the pipe joint by forging or welded to the pipe joint to form the valve seat. The sealing plate is used to seal one end inside the valve seat, and then through the cold stamping and stretching process, its diameter is sunk to form a sealing boss that abuts against the valve plate. In the subsequent use process, sealing the sealing boss can ensure the sealing performance of the entire check valve, improve the sealing performance, and avoid the situation where the check plate is not completely sealed when it abuts against the original sealing plate. The overall outer peripheral surface of the entire structure of the valve body is set without leakage, and only the sealing condition on one side of the sealing boss needs to be considered, greatly improving its sealing performance.

[0020] To prepare the valve body of the above high-strength check valve, the following technical solution is provided: The manufacturing process of the valve body of the high-strength check valve is characterized by including the following steps:

[0021] : Prepare the valve seat. Cut a number of small sections from both the steel pipe and the formed pipe according to the size of the valve body through the sawing process. Weld the small sections of the formed pipe cut from both ends of the cut small-section steel pipe to obtain a semi-finished valve seat. Then, process threads on the inner sides of the formed pipes at both ends of the semi-finished valve seat through the finishing process to make the valve seat.

[0022] Prepare the sealing plate. Punch a number of circular semi-finished sealing plates with a hollow diameter in the center from the metal plate according to the size of the valve body through the cold stamping process. Then, through the cold stamping and drawing process or the cold forging process, make the diameter of the semi-finished sealing plate bulge to one side to form a sealing boss, and thus make the sealing plate.

[0023] Prepare the flow plate. Punch a number of circular semi-finished flow plates with a central hole in the center and a number of flow holes arranged around the central hole from the metal plate according to the size of the valve body through the cold stamping process. Then, through the cold stamping and drawing process or the cold forging process, form a flow mounting seat, and process threads on the outer peripheral surface of the flow mounting seat that match the inner wall of the formed pipe through the finishing process.

[0024] : Fix the sealing plate produced in S1 on one side of the inner wall of the valve seat through the welding process, and the sealing boss faces the other side of the valve seat to make a semi-finished valve body.

[0025] : Screw the side of the semi-finished valve body away from the sealing plate in S2 with the flow plate to assemble the valve body.

[0026] With the above technical solution, the process of manufacturing the valve body is changed from casting to cold stamping and deep drawing. Specifically, the valve body is split into a valve seat, a flow plate, and a sealing plate. The valve seat is integrally formed with a pipe joint by forging or welded to the pipe joint to form the valve seat. The sealing plate is used to seal one end inside the valve seat. Then, through the cold stamping and stretching process, its through-diameter is sunk to form a sealing boss that abuts against the valve plate, so that the sealing of the entire check valve can be ensured by sealing the sealing boss during subsequent use, improving the sealing performance and avoiding the situation where the check plate is not completely sealed when it abuts against the original sealing plate. The flow plate is threadedly connected to the pipe thread at the other end of the valve seat through the thread on its outer peripheral surface, and the flow plate and the sealing plate form a flow cavity for the check plate to move. Moreover, due to the flow mounting seat formed by the cold stamping and deep drawing process of the flow plate, the flow rate of the flow hole can be increased, and the overall outer peripheral surface of the valve body is set without leakage during the whole process. Only the sealing situation on one side of the sealing boss needs to be considered, which greatly improves its sealing performance. The whole process replaces casting with cold stamping, finishing, sawing, and welding processes, greatly reducing production costs and industrial pollution, and improving the product manufacturing efficiency. The flow plate and the sealing plate formed by cold stamping, due to the obvious refinement of grains after die pressing deformation, a large amount of deformation is accumulated during the deformation process, and the area of equiaxed grains in the microstructure increases significantly, increasing the mass under the same volume and improving its overall strength, thus solving the problems that the cast valve body is prone to freeze cracking at low temperatures and air drying at normal temperatures, and improving the service life of the valve seat.

[0027] The above-mentioned valve body manufacturing process can be further set as follows: The cold stamping and deep drawing process used in preparing the sealing plate in step S1 refers to placing the processed semi-finished sealing plate in a cold stamping and deep drawing die, and punching out a sealing boss with a convex side from the hollow through-diameter of the semi-finished sealing plate through a stamping device.

[0028] The finishing processes used in preparing the valve seat and the flow plate in step S1 both refer to: making a spiral thread with a continuous convexity of a specific cross-section on the surface or inner wall of the steel pipe through a lathe, so that the valve seat and the flow plate form a matching thread surface for assembly in S3.

[0029] The welding process referred to in step S1 is a laser welding process. The steel pipe is a stainless steel pipe, and the formed pipe is a hexagonal pipe.

[0030] Adopting the above technical solution, the semi-finished sealing plate prepared by the cold stamping and drawing process has the advantages of high processing and production efficiency and high material utilization rate. Moreover, for the semi-finished sealing plate after cold stamping and drawing, through plastic deformation, its overall strength is improved, thus solving the problem that the cast valve body is prone to freezing and cracking at low temperatures. Most of the finish machining mentioned in step S1 refers to thread machining on the valve seat or flow plate. Machining processes such as cutting, turning, milling, and grinding can be used to machine the workpiece to form threads. The threads can be internal threads or external threads, as long as the parts to be connected can be thread-connected. The laser welding process means that the laser radiation heats the surface to be processed, and the surface heat diffuses into the interior through heat conduction. By controlling laser parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool, thereby connecting the workpieces to be welded. It has the advantages of fast welding speed, small deformation, and convenient processing. The selection of stainless steel pipes avoids the rusting of the valve body, and the hexagonal pipes facilitate subsequent pipeline connection.

[0031] To prepare the check plate of the above high-strength check valve, the following technical solution is provided: The manufacturing process of the check plate of the high-strength check valve is characterized by including the following steps:

[0032] A1: Prepare the valve plate. According to the size of the valve body, the metal plate is punched into several valve plates with a positive circular plate at the center and at least three limiting bumps distributed around the positive circular plate through the cold stamping process;

[0033] Prepare the valve stem. According to the size of the valve seat, several valve stems are made from the pipe through a cold forging machine;

[0034] A2: Fix and connect the valve stem and the valve plate produced in A1 through the welding process, the screwing process, or the riveting process to make a semi-finished check plate;

[0035] A3: Make the valve plate surface of the semi-finished check plate obtained in A2 form a sealing layer through the dip coating process to make the check plate.

[0036] With the above technical solution, due to the improvement of the check valve structure, the original guiding groove in the valve seat is changed to a limiting bump on the valve plate. A semi-finished valve plate with a circular plate directly stamped on a metal plate by cold stamping process and having at least three limiting bumps distributed around the circular plate at the edge is obtained. The circular plate is responsible for sealing the movable joint of the valve seat, and the three limiting bumps distributed at the corners can assist the valve plate in positioning when stretching and contracting in the valve seat, preventing it from tilting, improving stability, and enabling the fluid to pass through the flow channel formed by the limiting bumps and the inner wall of the valve seat. After punching the center of the semi-finished valve plate, the valve plate is made, and the valve stem is also quickly batch processed by a cold forging machine. Only by assembling the processed valve stem and valve plate through welding, screwing process or riveting process can a semi-finished check plate be made movable. Then, after dipping the valve plate of the check plate in plastic, a soft sealing ring can be formed on the surface of the valve plate, achieving a soft sealing effect when it abuts against the diameter of the movable joint, greatly improving the processing efficiency and sealing effect of the product.

[0037] The manufacturing process of the above check plate can be further set as follows: The screwing process in step A2 refers to punching a hole in the center of the valve plate, machining a thread with an outer diameter smaller than the valve stem at one end of the valve stem by precision machining process, passing the threaded end of the valve stem through the central through hole of the valve plate and connecting with a nut, and assembling the valve stem and the valve plate into a semi-finished check plate through the nut. The riveting process in step A2 refers to punching a hole in the center of the valve plate, passing one end of the valve stem through the central through hole of the valve plate, and assembling the valve stem and the valve plate into a non-detachable semi-finished check plate through a riveting device.

[0038] With the above technical solution, a central through hole is obtained by punching a hole in the center of the valve plate. Through the screwing process, a thread with an outer diameter smaller than the valve stem is machined at one end of the valve stem by precision machining process to prevent the whole valve stem from passing through the central through hole. The threaded end of the valve stem passes through the central through hole of the valve plate and is connected with a nut. After the valve stem or the valve plate is connected by the nut and then dipped in plastic, or through the riveting process, one end of the valve stem passes through the central through hole of the valve plate and the valve stem and the valve plate are assembled into a non-detachable semi-finished check plate through a riveting device, improving the processing efficiency.

[0039] The manufacturing process of the above check plate can be further set as follows: The dipping process in step A3 refers to preheating the semi-finished check plate obtained in A2 and then immersing it in plastisol, so that the plastisol is plasticized and formed into a soft sealing layer on the surface of the check plate.

[0040] With the above technical solution, by dipping the valve plate of the check plate, the plastisol is plasticized and formed into a soft sealing layer on the surface of the check plate, achieving a soft sealing effect and improving the reverse osmosis resistance of the check valve.

[0041] The present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0042] Figure 1 Schematic three-dimensional view of an embodiment of the present invention.

[0043] Figure 2 is Figure 1 exploded view of.

[0044] Figure 3 Cross-sectional view of an embodiment of the present invention.

[0045] Figure 4 Cross-sectional view of the semi-finished valve body of an embodiment of the present invention.

[0046] Figure 5 Schematic structural view of the check plate of an embodiment of the present invention.

[0047] Figure 6 Schematic structural view of the flow plate of an embodiment of the present invention.

[0048] Figure 7 Schematic structural view of the sealing plate of an embodiment of the present invention. Detailed implementation manners

[0049] Such as Figures 1 - 7As shown, a high-strength check valve includes a valve seat 1, a check plate 2 and a spring 3. The check plate 2 is arranged inside the valve seat 1. The check plate 2 includes a valve plate 21 and a valve rod 22. The spring 3 is sleeved on the outer peripheral surface of the valve rod 22. Pipe joints 4 integrally formed by forging with the valve seat 1 are provided at both ends of the valve seat 1. Pipe threads 41 are provided on the inner walls of the pipe joints 4. The inner cavities of the valve seat 1 and the two side pipe joints 4 are mutually communicated. A sealing plate 5 is provided at one end of the valve seat 1, and a flow plate 6 is provided at the other end. The sealing plate 5 is provided with a through-diameter 51 communicating with the inner cavity of the valve seat 1. A central hole 61 for the valve rod 22 to pass through is opened at the center of the flow plate 6. Three flow holes 62 are opened on the flow plate 6 around the central hole 61. The flow plate 6 is threadedly installed on the valve seat 1 through the pipe thread 41 and forms a flow cavity a for the check plate 6 to reciprocate therein with the sealing plate 5. Three limiting bumps 211 are provided on the outer peripheral surface of the valve plate 21 around the valve plate 21. The valve plate 21 abuts against the inner wall of the flow cavity a through the limiting bumps 211. One end of the spring 3 abuts against the flow plate 6, and the other end abuts against the valve plate 21, and urges the valve plate 21 to fit with the sealing plate 5. One end of the outer peripheral surface of the flow plate 6 is bent to form a flow mounting seat 63. An installation thread 631 adapted to the pipe thread 41 is provided on the flow mounting seat 63. The flow plate 6 increases the gap between the central hole 61 and the flow mounting seat 63 through the flow mounting seat 63, thereby increasing the flow rate of the flow holes 62. A sealing boss 52 extends from one end of the sealing plate 5 facing the valve plate 21. The valve plate 21 abuts against the sealing boss 52 and covers the through-diameter 51 of the sealing boss 52. A central through-hole 211 is provided at one end of the valve plate 21 corresponding to the valve rod 22. A threaded connection portion 221 with a diameter smaller than the inner diameter of the central through-hole 211 is provided on the valve rod 22. A nut 23 is connected after the threaded connection portion 221 passes through the central through-hole 211. A sealing ring 24 is provided between the nut 23 and the valve plate 21.

[0050] The valve body manufacturing process for preparing the high-strength check valve in the embodiment of the present invention includes the following steps:

[0051] : Prepare the valve seat. Cut a stainless steel pipe and a hexagonal pipe into several small sections by a sawing process according to the size of the valve body. Weld the cut small sections of the hexagonal pipe to both ends of the cut small section of the stainless steel pipe by a laser welding process to obtain a semi-finished valve seat. Then, make spiral pipe threads with continuous protrusions of a specific cross-section on the inner walls of the hexagonal pipes at both ends of the semi-finished valve seat by a lathe for subsequent pipe connection, thereby making the valve seat.

[0052] Manufacture a sealing plate. According to the size of the valve body, punch a metal plate into several semi-finished sealing plates that are circular and have a hollow through-hole in the center by a stamping machine. Then place the semi-finished sealing plates in a cold stamping and drawing die, and use stamping equipment to punch out a sealing boss with a convex side from the hollow through-hole of the semi-finished sealing plates, thereby manufacturing the sealing plate;

[0053] Manufacture a flow plate. According to the size of the valve body, punch a metal plate into several semi-finished flow plates that are circular, have a central hole in the center, and have 3 flow holes arranged around the central hole on the periphery of the central plate by a stamping machine. Then place the semi-finished flow plates in a cold stamping and drawing die, and use stamping equipment to punch out a flow mounting seat with a bent side from the outer peripheral surface of the semi-finished sealing plates, and use a lathe to machine a thread on the outer peripheral surface of the flow mounting seat that matches the inner wall pipe thread of the hexagonal pipe;

[0054] : Fix the sealing plate produced in S1 on one side of the inner wall of the valve seat through a laser welding process, and the sealing boss faces the other side of the valve seat to make a semi-finished valve body;

[0055] : Screw the side of the semi-finished valve body away from the sealing plate in S2 with the flow plate to assemble into a valve body.

[0056] A manufacturing process for manufacturing a check valve plate for a high-strength check valve in an embodiment, including the following steps:

[0057] A1: Manufacture a valve plate 21. According to the size of the valve body, punch a metal plate into several valve plates 21 with a regular circular plate in the center and three limiting protrusions 211 distributed around the regular circular plate at the edge by a stamping machine;

[0058] Manufacture a valve stem 22. According to the size of the valve seat, make several valve stems 22 from pipe materials by a cold forging machine;

[0059] A2: Punch a central through-hole 211 in the center of the valve plate 21 produced in A1. Machine a threaded connection part 221 with an outer diameter smaller than that of the valve stem 22 on the outer peripheral surface at one end of the valve stem 22. Pass the valve stem 22 through the central through-hole 211 of the valve plate 21 through the threaded connection part 221 and connect it with a nut 23, and use the nut 23 to assemble the valve stem 22 and the valve plate 21 into a semi-finished check valve plate;

[0060] A3: Preheat the semi-finished check valve plate obtained in A2 and immerse it in plastisol. After the plastisol is plasticized and formed, a soft sealing layer is formed on the surface of the check valve plate to form a sealing layer 24 on the surface of the valve plate to manufacture the check valve plate.

Claims

1. High-strength check valve, comprising a valve body, a check plate and a spring, wherein the valve body includes a valve seat, a flow plate and a sealing plate, the check plate is arranged in the valve seat, the check plate includes a valve plate and a valve stem, and the spring is sleeved on the outer peripheral surface of the valve stem, and is characterized in that: Both ends of the valve seat are provided with pipe joints fixedly arranged with the valve seat or integrally formed by forging with the valve seat. Pipe threads are provided on the inner walls of the pipe joints. The inner cavities of the valve seat and the pipe joints on both sides are mutually communicated. One end of the valve seat is provided with a sealing plate, and the other end is provided with a flow plate. The sealing plate is provided with a through diameter communicated with the inner cavity of the valve seat. A central hole for the valve stem to pass through is opened in the center of the flow plate. Three flow holes are opened on the flow plate and arranged around the central hole. The flow plate is threadedly installed on the valve seat through the pipe thread and forms a flow cavity for the check plate to reciprocate therein with the sealing plate. Three limiting bumps are arranged around the outer peripheral surface of the valve plate. The valve plate abuts against the inner wall of the flow cavity through the limiting bumps. One end of the spring abuts against the flow plate, and the other end abuts against the valve plate, and urges the valve plate to fit with the sealing plate. One end of the outer peripheral surface of the flow plate is bent to form a flow mounting seat. The flow mounting seat is provided with a mounting thread adapted to the pipe thread. The flow plate increases the gap between the central hole and the flow mounting seat through the flow mounting seat, thereby increasing the flow rate of the flow holes. One end of the sealing plate extending towards the valve plate is provided with a sealing boss. The valve plate abuts against the sealing boss and covers the through diameter of the sealing boss. A central through hole is provided at one end of the valve plate corresponding to the valve stem. A threaded connection portion with a diameter smaller than the inner diameter of the central through hole is provided on the valve stem. A nut is connected after the threaded connection portion passes through the central through hole. A sealing ring is provided between the nut and the valve plate; The flow plate is prepared in the following manner: The metal plate is punched into several circles by a punching machine according to the size of the valve body, and a semi-finished flow plate with a central hole in the center and three flow holes arranged around the central hole around the central plate is obtained. Then, the semi-finished flow plate is placed in a cold stamping and drawing die, and a flow mounting seat with one side bent is punched out on the outer peripheral surface of the semi-finished sealing plate through a stamping device, and a thread matching the pipe thread on the inner wall of the hexagonal pipe is machined on the outer peripheral surface of the flow mounting seat by a lathe.

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