Valve device for high pressure gases and method of use

Abstract

The application discloses a valve device for high-pressure gas and a use method, comprising a valve body, a valve seat and a valve core; the valve seat is arranged in a valve cavity, and the valve seat is provided with a throttling groove, a first sealing surface and a valve port; the valve core is movably arranged in the valve cavity, and the valve core is provided with a second sealing surface and throttling teeth, the second sealing surface corresponds to the first sealing surface; the throttling teeth are arranged in the throttling groove, and the ring width of the throttling teeth is smaller than that of the throttling groove; an auxiliary channel is formed between the throttling groove and the throttling teeth, one end of the auxiliary channel is connected with a gas inlet, the other end is connected with the valve port, and the valve core is used for adjusting the length of the auxiliary channel. With the closing of the valve, the valve core is closer and closer to the valve seat, the length of the auxiliary channel is shorter and shorter, and the flow of the high-pressure gas is lower and lower, so that the scouring and relative force of the high-pressure gas on the valve core are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve device for high-pressure gas and a use method, belonging to the technical field of valve. BACKGROUND

[0002] Valves are used to open and close pipelines, control flow direction, adjust and control parameters (temperature, pressure and flow) of delivered medium. According to its function, it can be divided into shut-off valves, check valves, regulating valves, etc. Valves are control components in fluid conveying systems, with functions of cutting off, regulating, guiding flow, preventing backflow, stabilizing pressure, dividing flow or overflow pressure relief, etc. Valves for fluid control systems, from the simplest shut-off valve to the most complex self-control system used in various valves, have quite a variety of types and specifications. Valves can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive medium, etc. Valves are also divided by material into cast iron valves, cast steel valves, stainless steel valves, chromium-molybdenum steel valves, chromium-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, non-standard customized valves, etc.

[0003] From the structure of the shut-off valve, the general fluid flow direction is low-in and high-out installed in the system or pipeline to cut off the gas. Once the shut-off valve is in the open state, there is no contact between the valve seat and the valve core sealing surface, so the mechanical wear of the sealing surface is small. When the valve needs to be closed, the valve rod acts on the valve core to make the valve core move downward and fit with the valve seat sealing surface to achieve the effect of cutting off the gas.

[0004] The valve core of the shut-off valve is a whole plane structure. When the valve is closed, the high-pressure gas acts on the plane valve core. The resistance of this high-pressure gas flow is overcome by the force of the valve rod. Therefore, when the valve is closed, the valve cannot be closed. When the valve is reversed, it is labor-saving to close the valve, but the resistance of the high-pressure gas flow acts on the back plane of the valve core, causing difficulty in opening the valve. In addition, the connection between the valve rod and the valve core is usually by pin or hanging connection. The strong torque acting on the valve rod can easily cause the valve rod and the valve core to fall off and fail to isolate the high-pressure gas, causing the system to stop and replace the valve, causing economic losses to the production. SUMMARY

[0005] In view of the above technical problems, the present application provides a valve device for high-pressure gas and a use method, which can effectively overcome the resistance of high-pressure gas flow and complete the closing of the valve.

[0006] A valve device for high-pressure gas, characterized in that it comprises a valve body, a valve seat and a valve core.

[0007] The valve body is provided with a valve cavity, a gas inlet and a gas outlet communicating with the valve cavity.

[0008] The valve seat is arranged inside the valve cavity, and a stepped through hole is formed in the valve seat, the hole diameter of the hole on the outer side is larger than the hole diameter of the hole on the inner side, the upper bottom surface of the valve seat is provided with a throttling groove which is a circular ring body, the middle bottom surface of the valve seat is provided with a first sealing surface which is a circular ring, and the lower bottom surface of the valve seat is provided with a valve port for the flow of high-pressure gas.

[0009] The valve core is movably arranged inside the valve cavity, the upper part and the lower part of the valve core are both conical, the lower half of the upper part of the valve core is connected with the upper half of the valve core through a plane, a second sealing surface is arranged on the plane, and the second sealing surface corresponds to the first sealing surface; the bottom surface of the lower part of the valve core is larger than the bottom surface of the upper part of the valve core, the bottom surface of the upper part of the valve core is attached to the bottom surface of the lower part of the valve core, the non-attached part of the bottom surface of the lower part of the valve core is provided with a throttling tooth, the throttling tooth corresponds to the throttling groove, and the ring width of the throttling tooth is smaller than the ring width of the throttling groove; an auxiliary channel is formed between the throttling groove and the throttling tooth, one end of the auxiliary channel is connected with the gas inlet, and the other end is connected with the valve port, and the valve core is used for adjusting the length of the auxiliary channel.

[0010] Further improvement of the above technical scheme is that the valve rod and the valve ball are arranged inside the valve cavity, one end of the valve rod is connected with the valve ball, and the other end is threadedly connected with the valve body.

[0011] A stepped hole is formed in the valve core, in the stepped hole, the hole diameter of the hole on the outer side is smaller than the hole diameter of the hole on the inner side, the diameter of the valve ball is between the hole diameter of the hole on the outer side and the hole diameter of the hole on the inner side, the valve ball is arranged in the hole on the inner side, and the end of the valve rod connected with the valve ball is inserted into the hole on the outer side.

[0012] Further, the guide rod and the guide cylinder are arranged inside the valve cavity.

[0013] A guide hole is further formed in the valve core, one end of the guide rod is inserted into the guide hole and threadedly connected with the guide hole, the other end of the guide rod is inserted into one end of the guide cylinder, and the other end of the guide cylinder is fixed on the valve body.

[0014] Further, the guide hole is in communication with the hole on the inner side in the stepped hole, and the hole diameter of the guide hole is larger than the hole diameter of the hole on the inner side.

[0015] Further, the positioning rod and the positioning cylinder are further arranged, one end of the positioning rod is fixed on the valve core, the other end is inserted into one end of the positioning cylinder, the other end of the positioning cylinder is fixed on the valve body, the end of the positioning rod inserted into one end of the positioning cylinder is provided with a first positioning block at intervals, and the inner wall of the positioning cylinder is provided with a second positioning block at intervals to prevent the first positioning block from moving upward.

[0016] Further, the valve cover and the support are further arranged.

[0017] The top surface of the valve body is provided with a first through hole for the valve rod to pass through, the valve cover is provided with a second through hole corresponding to the first through hole, the bottom surface of the valve cover is attached to the top surface of the valve body, the bracket is a V-shaped rod, both ends of which are fixed on the top surface of the valve cover, the middle part of the bracket is a circular ring body, which is located above the valve cover, and the inner circle of the circular ring body corresponds to the second through hole.

[0018] Further, the valve body sealing body and two or more telescopic rods are further included, the valve body sealing body is located in the first through hole and the second through hole, and the middle part of the valve body sealing body is provided with a fourth through hole; the telescopic rods are arranged on the hole wall of the fourth through hole in a spaced and surrounding manner.

[0019] Further, the hand wheel is further included, and the hand wheel is located on the end of the valve rod which is not connected to the valve ball.

[0020] A valve device for high-pressure gas is used for the valve device for high-pressure gas, and the method comprises the following steps: rotating the hand wheel clockwise, moving the valve rod upward, and then moving the valve core upward, because the valve rod is screwed with the valve body, the throttle teeth are aligned with the throttle groove, as the valve core moves upward, the torque required for rotating the hand wheel increases, when the throttle teeth enter the throttle groove, the throttle groove and the throttle teeth form an auxiliary channel, the torque required for rotating the hand wheel decreases, continue to rotate the hand wheel, the length of the auxiliary channel of the throttle groove and the throttle teeth becomes longer and longer, when the valve seat contacts the valve core, the first sealing surface contacts the second sealing surface to seal, and the closing of the valve device for high-pressure gas is completed.

[0021] From the above technical solution, it can be known that: (1) the valve device for high-pressure gas provided by the application is characterized in that a throttle groove is arranged on one side of the valve seat, a throttle tooth is arranged on one side of the valve core at a corresponding position, the throttle tooth corresponds to the throttle groove, and the ring width of the throttle tooth is smaller than the ring width of the throttle groove; therefore, an auxiliary channel is formed between the throttle groove and the throttle tooth, one end of the auxiliary channel is connected with the gas inlet, and the other end is connected with the valve port, as the valve is closed, the distance between the valve core and the valve seat becomes shorter, and the length of the auxiliary channel becomes shorter, so that the flushing and relative force generated by the high-pressure gas due to the shortening of the distance between the valve core and the valve seat are reduced.

[0022] (2) the valve device for high-pressure gas provided by the application is characterized in that the valve rod and the valve ball are arranged inside the valve cavity, one end of the valve rod is connected with the valve ball, and the other end is screwed with the valve body; a stepped hole is arranged on the valve core, the hole diameter of the hole on the outer side of the stepped hole is smaller than the hole diameter of the hole on the inner side of the stepped hole, the diameter of the valve ball is between the hole diameter of the hole on the outer side of the stepped hole and the hole diameter of the hole on the inner side of the stepped hole, the valve ball is arranged in the hole on the inner side of the stepped hole, and the end of the valve rod connected with the valve ball is inserted into the hole on the outer side of the stepped hole; therefore, the cooperation between the valve ball and the hole on the inner side of the stepped hole of the valve core is achieved by integral machining of the valve ball and the valve rod, the valve ball rotates freely in the hole on the inner side of the stepped hole of the valve core, and the valve rod and the valve core are prevented from falling off.

[0023] (3) The valve device for high pressure gas provided by the present application is also provided with a guide hole on the valve core, one end of the guide rod is inserted into the guide hole, the other end of the guide rod is inserted into one end of the guide cylinder, the other end of the guide cylinder is fixed on the valve body, the guide hole is communicated with the hole on the inner side of the stepped hole, and the diameter of the guide hole is larger than that of the hole on the inner side. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0025] Figure 1 The schematic diagram of the valve device for high pressure gas provided by the present application is shown in the figure.

[0026] Figure 2 The partial enlarged view of A in the figure is shown in the figure. Figure 1

[0027] Figure 3 The schematic diagram of another valve device for high pressure gas provided by the present application is shown in the figure.

[0028] Figure 4 The partial enlarged view of B in the figure is shown in the figure. Figure 3

[0029] The bottom view of the flange in the valve device for high pressure gas provided by the present application is shown in the figure. Figure 5

[0030] The bottom view of the valve cover in the valve device for high pressure gas provided by the present application is shown in the figure. Figure 6

[0031] The bottom view of the valve seat in the valve device for high pressure gas provided by the present application is shown in the figure. Figure 7

[0032] The top view of the valve core in the valve device for high pressure gas provided by the present application is shown in the figure. Figure 8

[0033] The top view of the guide cylinder in the valve device for high pressure gas provided by the present application is shown in the figure. Figure 9

[0034] ​​In the figure: 1, valve body, 2, flange, 3, valve cover, 4, valve core, 5, valve stem, 6, guide rod, 7, guide cylinder, 8, bolt, 9, valve seat, 10, valve body sealing body, 11, hand wheel, 12, sealing gland, 13, bolt, 14, flange hole, 15, valve cover flange hole, 16, valve stem nut, 17, bracket, 18, throttling groove, 19, first sealing surface, 20, throttling tooth, 21, guide hole, 22, valve core lifting hole, 23, second sealing surface, 24, flange hole, 25, first positioning block, 26, second positioning block. Specific embodiments

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0036] Reference Figure 1 And Figure 2 A valve device for high-pressure gas, comprising a valve body 1, a valve seat 9, and a valve core 4; wherein the valve body 1 is provided with a valve cavity, a gas inlet, and a gas outlet communicating with the valve cavity, as Figure 1 The left side of the valve body 1 is provided with a gas inlet, and the right side of the valve body 1 is provided with a gas inlet;

[0037] The valve seat 9 is arranged inside the valve cavity, the valve seat 9 is provided with a stepped through hole, the hole diameter of the outer side hole is larger than that of the inner side hole, the upper bottom surface of the valve seat is provided with a throttling groove 18 which is a circular ring body, the middle bottom surface of the valve seat is provided with a first sealing surface 19 which is a circular ring, and the lower bottom surface of the valve seat 9 is provided with a valve port for high-pressure gas flow; when the valve core 4 moves downward and does not contact the valve seat 9, the flow sequence of the high-pressure gas is: gas inlet-assisted channel-valve port-gas outlet, the throttling groove 18 is a circular ring body arranged around the valve port, and the first sealing surface 19 is a circular ring arranged around the valve port; due to the presence of the valve seat 9, the flow direction of the high-pressure gas is from the gas inlet to the valve port to the gas outlet;

[0038] Reference Figure 1 , Figure 2 And Figure 9The valve core 4 is movably arranged inside the valve cavity, and is composed of an upper valve core part and a lower valve core part. The upper valve core part and the lower valve core part are both conical, the conical surface of the lower half of the upper valve core part is connected with the conical surface of the upper half through a plane, and the plane is provided with a second sealing surface 23. The bottom surface of the lower valve core part is larger than the bottom surface of the upper valve core part, the bottom surface of the upper valve core part is attached to the bottom surface of the lower valve core part at the attachment position, and the bottom surface of the lower valve core part is provided with throttling teeth 20 at the non-attachment position. The second sealing surface 23 corresponds to the first sealing surface 19. The throttling teeth 20 correspond to the throttling grooves 18, and the ring width of the throttling teeth 20 is smaller than the ring width of the throttling grooves 18. The throttling grooves 18 and the throttling teeth 20 form an auxiliary channel, one end of the auxiliary channel is connected with the gas inlet, and the other end is connected with the valve port. The valve core 4 is used for adjusting the length of the auxiliary channel. By moving the valve core 4, the valve core 4 completely blocks the valve port, and the flow of high-pressure gas is cut off, so as to complete the on-off of the valve. When the valve core 4 is close to the valve seat 9, the resistance of the high-pressure gas flow to the valve core 4 is great. However, due to the existence of the throttling grooves 18 and the throttling teeth 20, the distance between the valve core 4 and the valve seat 9 becomes shorter, the length of the auxiliary channel becomes shorter, and the flow velocity increases. The throttling grooves 18 and the throttling teeth 20 cause local retraction, and the static pressure difference is formed on both sides of the throttling grooves 18 and the throttling teeth 20, so that the working pressure of the gas is reduced, the energy is consumed, and the throttling function is achieved. Therefore, the scouring and relative force generated by the high-pressure gas due to the shortening of the distance between the valve core 4 and the valve seat 9 are reduced.

[0039] The stepped through hole is arranged to match the shape of the valve core 4.

[0040] The conical structure of the upper valve core part and the lower valve core part of the valve core effectively reduces the pressure force of the high-pressure gas on the valve core, thereby reducing the force of the valve rod 5 on the valve core 4, and avoiding the disengagement of the valve rod 5 from the valve core 4 due to excessive force.

[0041] The second sealing surface 23 and the throttling teeth 20 are arranged on the plane of the valve core 4 because they cannot be arranged on the curved surface.

[0042] The first sealing surface 19 is a machined and ground sealing surface, and the second sealing surface 23 is a sealing surface matched with the first sealing surface 19.

[0043] The grinder is well attached to the surface of the sealing ring, and the grinder makes complex grinding movements along the attached surface. The grinder and the surface of the sealing ring are provided with an abrasive agent. When the grinder and the surface of the sealing ring move relative to each other, part of the abrasive grains in the abrasive agent slide or roll between the grinder and the surface of the sealing ring, and a very thin layer of metal on the surface of the sealing ring is cut off. The convex part on the surface of the sealing ring is first ground off, and then gradually reaches the required geometric shape. The grinding is not only a mechanical processing process of the abrasive on the metal, but also has a chemical effect. The oil in the abrasive agent can form an oxide film on the processed surface, thereby accelerating the grinding process.

[0044] The relative motion between the grinder and the sealing ring surface should be the same for each point on the sealing ring surface. Moreover, the direction of the relative motion should be constantly changed. The constant change of the motion direction makes each abrasive grain not repeat its motion track on the sealing ring surface, so as to avoid obvious grinding marks and increase the roughness of the sealing ring surface. In addition, the constant change of the motion direction cannot make the abrasive grains be distributed more uniformly, so as to cut the metal of the sealing ring surface more uniformly.

[0045] The grinding motion is complicated, and the motion direction is greatly changed. However, the grinding motion is always along the contact surface between the grinder and the sealing ring surface. Whether the grinding is manual or mechanical, the geometric accuracy of the sealing ring surface is mainly affected by the geometric accuracy of the grinder and the grinding motion.

[0046] Referring to Figure 1 and Figure 6 In other embodiments, the bottom of the valve body 1 is provided with a flange 2, and the flange 2 is used to facilitate the installation of the valve body 1 on the required equipment. The flange 2 is provided with a flange hole 14 to facilitate the fixation of the valve body 1.

[0047] Referring to Figure 1 and Fig. 9, in other embodiments, the valve bottom is provided with a flange hole 24, and the valve body 1 is fixed on the valve body 1 by a bolt 8.

[0048] Referring to Figure 1 , Figure 2 , Figure 9 In other embodiments, the valve core 4 is composed of an upper valve core part and a lower valve core part.

[0049] The upper valve core part and the lower valve core part are both conical, the conical surface of the lower half of the upper valve core part is connected to the conical surface of the upper half of the upper valve core part by a plane, and the second sealing surface 23 is arranged on the plane; the bottom surface of the lower valve core part is larger than the bottom surface of the upper valve core part, the bottom surface of the upper valve core part is attached to the attachment part of the bottom surface of the lower valve core part, and the throttling teeth 20 are arranged on the non-attachment part of the bottom surface of the lower valve core part.

[0050] The conical structure of the upper valve core part and the lower valve core part of the valve core effectively reduces the pressure force of the high-pressure gas on the valve core, thereby reducing the force of the valve rod 5 on the valve core 4, and avoiding the disengagement of the valve rod 5 from the valve core 4 due to excessive force.

[0051] The second sealing surface 23 and the throttling teeth 20 cannot be arranged on the curved surface, and can only be arranged on the plane of the valve core 4.

[0052] Referring to Figure 1 and Figure 3In some other embodiments, a valve stem 5 and a valve ball are further included, both of which are arranged inside the valve cavity, one end of the valve stem 5 is connected to the valve ball, due to the large force borne by the valve core 4, the conventional pressing of the valve stem 5 cannot meet the demand, thus the other end of the valve stem 5 is threadedly connected to the valve body 1, and the force borne by the staff is reduced through the thread.

[0053] A stepped hole is formed on the valve core 4, in the stepped hole, the hole diameter of the hole on the outer side is smaller than the hole diameter of the hole on the inner side, the diameter of the valve ball is between the hole diameter of the hole on the outer side and the hole diameter of the hole on the inner side, the valve ball is arranged in the hole on the inner side, and the end of the valve stem 5 connected to the valve ball is inserted into the hole on the outer side.

[0054] In some other embodiments, the hole on the inner side of the stepped hole is a circular hole, thus the valve ball cooperates with the circular arc surface of the hole on the inner side of the stepped hole of the valve core 4, the valve ball is integrally machined with the valve stem 5, the rotation of the valve ball in the hole on the inner side of the stepped hole of the valve core 4 is free, and the valve stem 5 and the valve core 4 are prevented from falling off.

[0055] Reference Figure 1 In some other embodiments, a guide rod 6 and a guide cylinder 7 are further included, both of which are arranged inside the valve cavity, and both of which are arranged on the valve bottom.

[0056] A guide hole 21 is further formed on the valve core 4, one end of the guide rod 6 is inserted into the guide hole 21, the other end of the guide rod 6 is inserted into one end of the guide cylinder 7, the other end of the guide cylinder 7 is fixed on the valve body 1, the guide hole 21 is communicated with the hole on the inner side of the stepped hole, and the hole diameter of the guide hole 21 is larger than the hole diameter of the hole on the inner side; the guide rod 6 mounted on the valve core 4 increases the stability of the valve core 4 when moving up and down in the guide cylinder 7, prevents the left and right positions from changing when the valve core 4 moves up and down, can make the comb teeth of the valve core 4 accurately enter the throttling groove 18 of the valve seat 9, and avoid irregular collision between the valve core 4 and the throttling groove 18. Effectively protect the sealing effect of the first sealing surface 19 and the second sealing surface 23.

[0057] The fixation of the guide rod 6 and the valve core 4 can be interference fit or threaded connection. The external thread of the guide rod 6 is screwed into the internal thread of the guide hole 21 or the interference fit of the guide rod 6 and the valve core 4 both prevent the gas from leaking along the guide hole 21 through the valve stem 5.

[0058] Reference Figure 3 and Figure 4In some other embodiments, a positioning rod and a positioning cylinder are further included, both of which are arranged on the valve bottom, one end of the positioning rod is fixed on the valve core 4, the other end is inserted into one end of the positioning cylinder, the other end of the positioning cylinder is fixed on the valve body 1, the one end of the positioning cylinder into which the positioning rod is inserted is provided with a first positioning block 26 at intervals, the inner wall of the positioning cylinder is provided with a second positioning block 25 at intervals to prevent the first positioning block 26 from moving upward, when the valve core 4 completely blocks the valve port, the second positioning block 25 prevents the first positioning block 26 from moving upward, thereby preventing the valve core 4 from further moving upward, avoiding increasing the wear of the first sealing surface 19 and the second sealing surface 23.

[0059] With reference to Figure 1 , Figure 3 and Fig. 7, in some other embodiments, a valve cover 3 and a bracket 17 are further included, the valve cover 3 is provided with a valve cover flange hole 15, the valve cover 3 is fixed on the valve body 1 through the bolt 13; the top surface of the valve body 1 is provided with a first through hole for the valve rod 5 to pass through, the valve cover 3 is provided with a second through hole corresponding to the first through hole, the bottom surface of the valve cover 3 is attached to the top surface of the valve body 1, the bracket 17 is a V-shaped rod, both ends of which are fixed on the top surface of the valve cover 3, the middle part of the bracket 17 is a circular ring body, which is located above the valve cover 3, and the inner circle of the circular ring body corresponds to the second through hole. The bracket 17 is used to facilitate the gripping of the valve body 1.

[0060] With reference to Figure 1 and Figure 3 In some other embodiments, the inner wall of the circular ring body is provided with a reverse thread, and the part of the valve rod 5 above the valve cover 3 is provided with a normal thread.

[0061] With reference to Figure 1 and Fig. 3, in some other embodiments, a hand wheel 11 is further included, which is located on the end of the valve rod 5 not connected to the valve ball.

[0062] A method for using the valve device for high-pressure gas, applied to the valve device for high-pressure gas, the method comprises: rotating the hand wheel 11 clockwise, moving the valve rod 5 upward, thereby moving the valve core 4 upward, since the valve rod 5 is threadedly connected with the valve body 1, the throttle teeth 20 are aligned with the throttle groove 18, as the valve core 4 moves upward, the torque required for rotating the hand wheel 11 increases, when the throttle teeth 20 enter the throttle groove 18, the auxiliary passage between the throttle groove 18 and the throttle teeth 20 is formed, the torque required for rotating the hand wheel 11 decreases, continue to rotate the hand wheel 11, the length of the auxiliary passage between the throttle groove 18 and the throttle teeth 20 becomes longer and longer, when the valve seat 9 contacts the valve core 4, the first sealing surface 19 contacts and seals with the second sealing surface 23, the closing of the valve device for high-pressure gas is completed.

[0063] The application is further described in detail with specific examples, but it should be understood that the specific description herein should not be construed to limit the scope of the application, and various modifications made by those skilled in the art after reading the description are within the scope of the application.

Claims

1. A valve device for high-pressure gas, characterized in that, Includes valve body, valve seat, valve core, and valve cover; The valve body has a valve cavity, and a gas inlet and a gas outlet communicating with the valve cavity; The valve seat is disposed inside the valve cavity, and the valve seat has a stepped through hole. The diameter of the hole on the outer side is larger than that of the hole on the inner side. The upper bottom surface of the valve seat has a throttling groove, which is an annular body. The middle bottom surface of the valve seat has a first sealing surface, which is an annular body. The lower bottom surface of the valve seat has a valve port for high-pressure gas flow. The valve core is movably disposed inside the valve cavity. Both the upper and lower portions of the valve core are conical. The conical surface of the lower half of the upper portion of the valve core is connected to the conical surface of the upper half by a plane. A second sealing surface is provided on this plane, and the second sealing surface corresponds to the first sealing surface. The bottom surface of the lower portion of the valve core is larger than the bottom surface of the upper portion of the valve core. The bottom surface of the upper portion of the valve core is attached to the bottom surface of the lower portion of the valve core at the attachment point. A throttling tooth is provided on the non-attached part of the bottom surface of the lower portion of the valve core. The throttling tooth corresponds to the throttling groove and extends into the throttling groove. The circumferential width of the throttling tooth is smaller than the circumferential width of the throttling groove. An auxiliary channel is formed between the throttling groove and the throttling tooth. One end of the auxiliary channel is connected to the gas inlet, and the other end is connected to the valve port. The valve core is used to adjust the length of the auxiliary channel.

2. The valve device for high-pressure gas according to claim 1, characterized in that, It also includes a valve stem and a valve ball, both of which are disposed inside the valve cavity. One end of the valve stem is connected to the valve ball, and the other end is threadedly connected to the valve body. The valve core has stepped holes. In the stepped holes, the diameter of the hole on the outer side is smaller than the diameter of the hole on the inner side. The diameter of the valve ball is between the diameter of the hole on the outer side and the diameter of the hole on the inner side. The valve ball is set in the hole on the inner side. The end of the valve stem connected to the valve ball is inserted into the hole on the outer side.

3. The valve device for high-pressure gas according to claim 2, characterized in that, It also includes a guide rod and a guide cylinder; both the guide rod and the guide cylinder are disposed inside the valve cavity; The valve core is also provided with a guide hole. One end of the guide rod is inserted into the guide hole and threadedly connected to the guide hole. The other end of the guide rod is inserted into one end of the guide cylinder, and the other end of the guide cylinder is fixed to the valve body.

4. The valve device for high-pressure gas according to claim 3, characterized in that, The guide hole is connected to the innermost hole in the stepped hole, and the diameter of the guide hole is larger than the diameter of the innermost hole.

5. The valve device for high-pressure gas according to claim 2, characterized in that, It also includes a positioning rod and a positioning cylinder. One end of the positioning rod is fixed to the valve core, and the other end is inserted into one end of the positioning cylinder. The other end of the positioning cylinder is fixed to the valve body. The end of the positioning rod inserted into the positioning cylinder is provided with a first positioning block at intervals. The inner wall of the positioning cylinder is provided with a second positioning block at intervals to prevent the first positioning block from moving upward.

6. The valve device for high-pressure gas according to claim 2, characterized in that, It also includes the valve cover and bracket; The top surface of the valve body is provided with a first through hole for the valve stem to pass through, the valve cover is provided with a second through hole corresponding to the first through hole, the bottom surface of the valve cover is attached to the top surface of the valve body, the bracket is a V-shaped rod with its two ends fixed to the top surface of the valve cover, the middle part of the bracket is a ring body and is located above the valve cover, and the inner circle of the ring body corresponds to the second through hole.

7. The valve device for high-pressure gas according to claim 2, characterized in that, It also includes a handwheel, which is located on the end of the valve stem that is not connected to the valve ball.

8. A method of using a valve device for high-pressure gas, characterized in that: The method, applied to the valve device for high-pressure gas according to claim 7, comprises: rotating the handwheel clockwise to move the valve stem upward, thereby driving the valve core upward; since the valve stem is threadedly connected to the valve body, the throttling tooth is aligned with the throttling groove; as the valve core moves upward, the torque required to rotate the handwheel increases; once the throttling tooth enters the throttling groove, an auxiliary channel is formed between the throttling groove and the throttling tooth, and the torque required to rotate the handwheel decreases; continuing to rotate the handwheel, the length of the auxiliary channel between the throttling groove and the throttling tooth becomes longer and longer; once the valve seat contacts the valve core, the first sealing surface contacts and seals with the second sealing surface, thus completing the closing of the valve device for high-pressure gas.

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