An oxygen shut-off valve

Abstract

The application relates to an oxygen stop valve, relates to the technical field of valves, and comprises a valve body provided with a flow channel, a valve cover installed on the valve body, a valve rod penetrating through the valve cover and extending into the valve body, and a valve disc connected with the inner end of the valve rod, the valve body is internally provided with an anti-rotation piece and a valve seat located below the valve disc, and the outer end of the valve rod is provided with an execution piece; the side surface of the valve seat close to the valve disc is provided with a fixed protruding ring, the outer circumferential surface of the fixed protruding ring is fixedly provided with an annular sealing ring, and the side surfaces of the fixed protruding ring and the annular sealing ring close to the valve cover can abut against the side surface of the valve disc; when the oxygen stop valve is in a closed state, the valve disc moves towards the valve seat, the side surfaces of the fixed protruding ring and the annular sealing ring close to the valve disc all abut against the bottom side of the valve disc, the double sealing setting of soft sealing and hard sealing is adopted, and the possibility of gap between the valve seat and the valve disc when the valve seat and the valve disc abut against each other in a high-temperature environment is reduced.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to an oxygen shut-off valve. Background Technology

[0002] Oxygen is an important industrial gas widely used in medical, chemical, and metallurgical fields. However, due to its flammable and explosive properties, it can easily cause dangerous accidents during use. Therefore, to ensure the safe operation of oxygen systems, various measures must be taken, one of which is the installation of oxygen shut-off valves. Oxygen shut-off valves are important pipeline components, primarily used to control the cut-off and opening of oxygen supply in oxygen pipelines.

[0003] In related technologies, the structure of an oxygen shut-off valve generally consists of a valve body, valve core, sealing gasket, handwheel, bolts, etc. The valve body is a cylindrical hollow structure with an inlet and outlet connected to the pipeline. The valve disc, usually circular or hexagonal, is responsible for opening and closing the pipeline and is connected to the handle via a valve stem. The valve seat is the basic sealing part of the valve and is usually made of materials such as stainless steel, possessing characteristics such as corrosion resistance and high temperature resistance. The handle is the part that operates the valve, usually a hand crank or handwheel type. When the oxygen shut-off valve is closed, the valve disc and valve seat are pressed tightly together. When the oxygen shut-off valve is open, the valve disc moves away from the valve seat, creating a gap between the valve seat and the valve disc.

[0004] After prolonged use, the valve disc of an oxygen shut-off valve may wear down, especially under harsh conditions such as high pressure and high temperature. This wear can be more severe and may cause gaps to appear between the valve seat and the valve disc when they are pressed together. Furthermore, under high temperature conditions, the valve seat and valve disc may undergo thermal expansion, causing changes in their dimensions. This can also lead to gaps when the valve seat and valve disc are pressed together, resulting in oxygen leakage when the oxygen shut-off valve is closed. There is room for improvement in this regard. Summary of the Invention

[0005] The purpose of this application is to provide an oxygen shut-off valve that solves the problem in the aforementioned related technologies where, after long-term use, the valve seat and valve disc may experience wear, especially under harsh conditions such as high pressure and high temperature, where the wear is more severe and can easily lead to gaps when the valve seat and valve disc are pressed together. Moreover, in high-temperature environments, the valve seat and valve disc may undergo thermal expansion, causing changes in their dimensions, which can also lead to gaps when the valve seat and valve disc are pressed together, resulting in oxygen leakage when the oxygen shut-off valve is closed.

[0006] The oxygen shut-off valve provided in this application adopts the following technical solution: An oxygen shut-off valve includes a valve body with a flow channel, a valve cover mounted on the valve body, a valve stem extending through the valve cover into the valve body, and a valve disc connected to the inner end of the valve stem. The valve body is provided with an anti-rotation component to prevent the valve stem from rotating around its own axis and a valve seat located below the valve disc. The outer end of the valve stem is provided with an actuator to control the reciprocating movement of the valve disc. A fixing protrusion is provided on the side of the valve seat near the valve disc, and an annular sealing ring is fixedly fitted on the outer circumferential surface of the fixing protrusion. The sides of the fixing protrusion and the annular sealing ring near the valve cover can abut against the side of the valve disc.

[0007] By adopting the above technical solution, when the oxygen shut-off valve is in the closed state, the valve disc moves towards the valve seat. Through the cooperation of the fixed convex ring and the annular sealing ring, the sides of both the fixed convex ring and the annular sealing ring near the valve disc are pressed against the bottom side of the valve disc. Through the dual sealing setting of soft seal and hard seal, the possibility of gaps appearing when the valve seat and valve disc are pressed against each other in a high-temperature environment is reduced, thereby improving the sealing performance of the oxygen shut-off valve when it is in the closed state.

[0008] Optionally, the valve body is provided with a pressure regulating plate inside, and the pressure regulating plate has several pressure regulating holes. The outer peripheral surface of the pressure regulating plate is fixedly abutted against the inner sidewall of the valve seat.

[0009] By adopting the above technical solution, during the application of this oxygen shut-off valve, oxygen enters from one side of the valve body through the opening, passes through the gap between the valve seat and the valve disc, and exits from the other side of the valve body. Through the setting of the pressure regulating plate and the pressure regulating hole on the pressure regulating plate, the pressure regulating plate can regulate the pressure of the delivered oxygen, reducing the possibility of loosening due to excessive oxygen pressure impacting the connection between the valve disc and the valve stem.

[0010] Optionally, a guide rod is fixedly provided on the side of the valve disc away from the valve stem, and a guide through hole is provided on the pressure regulating plate for the guide rod to pass through and slide.

[0011] By adopting the above technical solution, during the reciprocating movement of the valve disc along the direction close to the valve seat, the guide rod and the guide through hole on the pressure regulating plate are matched. During this process, the guide rod is simultaneously inserted into the guide through hole and slides, thereby reducing the possibility of the valve disc shifting or misaligning during movement, improving the stability of the valve disc during the adjustment process, and also reducing the possibility of gaps when the valve disc and the valve seat are pressed together.

[0012] Optionally, a limiting retaining ring is provided on the outer peripheral surface of the end of the guide rod away from the valve disc.

[0013] By adopting the above technical solution, during the sliding process of the guide rod along its own axial length, the installation of the limiting retaining ring reduces the possibility of the guide rod coming out of the guide through hole during the sliding process, thereby limiting the sliding stroke of the guide rod.

[0014] Optionally, the outer circumferential surface of the guide rod is provided with an adjustment assembly for controlling the opening and closing of the pressure regulating orifice. The adjustment assembly includes a blocking plate for blocking the pressure regulating orifice and a connecting rod for driving the blocking plate to move. One end of the connecting rod is hinged to the outer circumferential surface of the guide rod, and the other end of the connecting rod is hinged to one side of the blocking plate. The other side of the blocking plate is hinged to the side of the pressure regulating plate near the valve disc. The blocking plate blocks the pressure regulating orifice when the oxygen shut-off valve is closed, and the blocking plate rotates away from the pressure regulating plate when the oxygen shut-off valve is opened.

[0015] By adopting the above technical solution, when the oxygen shut-off valve is in the closed state, the connecting rod drives the sealing plate to block the pressure regulating hole on the pressure regulating plate; when the oxygen shut-off valve is in the open state, the valve disc and guide rod move away from the pressure regulating plate, at which time the connecting rod drives the sealing plate to rotate away from the pressure regulating plate, and the sealing plate releases the blockage of the pressure regulating hole; by adjusting the component, the pressure regulating plate inside the valve seat can be further sealed while the valve disc seals the valve seat, further improving the sealing performance of the oxygen shut-off valve when closed and reducing the possibility of leakage when the oxygen shut-off valve is in the closed state.

[0016] Optionally, an annular sealing strip is fixedly provided on the outer circumferential surface of the guide rod; when the oxygen shut-off valve is closed, the annular sealing strip abuts against the opening edge of the guide through hole near the valve disc, and the hinge of the connecting rod and the sealing plate abuts against the side of the annular sealing strip away from the pressure regulating plate.

[0017] By adopting the above technical solution, when the oxygen shut-off valve is in the closed state, the annular sealing strip abuts against the opening edge of the guide hole near the valve disc, and at the same time, the hinge of the connecting rod and the sealing plate abuts against the annular sealing strip, thereby further reducing the possibility of oxygen leakage from the connection gap between the guide rod and the guide hole.

[0018] Optionally, a retaining ring is fixedly provided on the inner wall of the valve seat, and a positioning protrusion ring is provided on the side of the pressure regulating plate away from the valve disc. The outer circumferential surface of the positioning protrusion ring is provided with a limiting ring groove for the retaining ring to be inserted. A fixing sleeve is provided inside the valve body and inserted into the positioning protrusion ring. One side of the fixing sleeve is provided with a flange that abuts against the side of the retaining ring away from the valve disc. The outer circumferential surface of the fixing sleeve is fixedly connected to the inner surface of the positioning protrusion ring.

[0019] By adopting the above technical solution, when installing and fixing the pressure regulating plate, the operator can insert the pressure regulating plate into the valve seat from the upper side by setting the fixing sleeve and the retaining ring, and then insert the fixing sleeve from the lower side of the valve seat and fix it to the inner side of the positioning convex ring, so that the side of the flange is pressed against the side of the retaining ring away from the valve disc, thereby realizing the installation and fixing of the pressure regulating plate and improving the disassembly and assembly efficiency of the pressure regulating plate.

[0020] Optionally, the valve body has a first sealing ring inside, and the side of the retaining ring away from the valve disc has a first mounting ring groove for the first sealing ring to be inserted and fixed.

[0021] By adopting the above technical solution, after the pressure regulating plate is installed, the first sealing ring and the first mounting ring groove are matched and the first sealing ring is pressed against the flange of the fixed sleeve, thereby achieving stability when the retaining ring and the flange of the fixed sleeve are in contact.

[0022] Optionally, the retaining ring has several positioning protrusions on its side near the valve disc, and the pressure regulating plate has positioning grooves for the positioning protrusions to be inserted.

[0023] By adopting the above technical solution, after the pressure regulating plate is installed, due to the cooperation between the positioning protrusion and the positioning groove, the positioning protrusion on the retaining ring is inserted into the positioning groove on the pressure regulating plate, thereby further improving the installation stability of the pressure regulating plate.

[0024] Optionally, the pressure regulating plate is provided with an elastic sealing ring on the side near the valve disc, the outer circumferential surface of which abuts against the inner wall of the valve seat, and one side of the elastic sealing ring can be pressed tightly against the side of the valve disc near the valve seat.

[0025] By adopting the above technical solution, when the oxygen shut-off valve is in the closed state, the annular sealing ring, the fixed convex ring, and the elastic sealing ring are all pressed against the bottom side of the valve disc. Through the soft-hard-soft triple sealing structure, the valve seat and the valve disc are sealed, thereby further improving the sealing performance of the oxygen shut-off valve when it is in the closed state.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By using the combination of a fixed convex ring and an annular sealing ring, when the oxygen shut-off valve is in the closed state, the valve disc moves towards the valve seat, so that the sides of both the fixed convex ring and the annular sealing ring close to the bottom side of the valve disc. Through the dual sealing of soft and hard seals, the possibility of gaps appearing when the valve seat and valve disc are close together under high temperature conditions is reduced, thereby improving the sealing performance of the oxygen shut-off valve when it is in the closed state.

[0027] 2. With the setting of the pressure regulating plate and the pressure regulating hole on the pressure regulating plate, during the application of this oxygen shut-off valve, oxygen enters from one side of the valve body through the opening and exits from the other side of the valve body after passing through the gap between the valve seat and the valve disc. The pressure regulating plate can regulate the pressure of the delivered oxygen, reducing the possibility of loosening due to excessive oxygen impact at the connection between the valve disc and the valve stem.

[0028] 3. By cooperating with the guide rod and the guide through hole on the pressure regulating plate, the guide rod is simultaneously inserted into the guide through hole and slides during the reciprocating movement of the valve disc in the direction close to the valve seat. This reduces the possibility of the valve disc shifting or misaligning during movement, improves the stability of the valve disc during adjustment, and also reduces the possibility of gaps when the valve disc and valve seat are pressed together.

[0029] 4. By adjusting the settings of the components, the pressure regulating plate inside the valve seat can be further sealed while the valve disc seals the valve seat, thereby further improving the sealing performance of the oxygen shut-off valve when closed and reducing the possibility of leakage when the oxygen shut-off valve is in the closed state. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional structural diagram illustrating the installation and cooperation between the valve disc and the valve seat in an embodiment of this application; Figure 3 This is a partial cross-sectional view of the installation and assembly of the pressure regulating plate according to an embodiment of this application; Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 yes Figure 3 Enlarged schematic diagram of part B; Figure 6 This is a partial cross-sectional view of the structure in an embodiment of this application, showing the sealing plate releasing the seal on the pressure regulating hole.

[0032] In the diagram, 1. Valve body; 11. Flow channel; 12. Valve seat; 121. Fixing convex ring; 122. Retaining ring; 1221. First mounting ring groove; 1222. Positioning protrusion; 13. Annular sealing ring; 14. First sealing ring; 15. Elastic sealing ring; 2. Valve cover; 21. First threaded groove; 3. Valve stem; 31. Actuator; 311. Operating handle; 312. Adjusting nut; 32. Anti-rotation component; 321. Anti-rotation slide bar; 3 211. First screw section; 322. Anti-rotation frame; 3221. Guide groove; 4. Valve disc; 41. Guide rod; 411. Annular sealing strip; 42. Limiting ring; 5. Pressure regulating plate; 51. Pressure regulating hole; 52. Positioning convex ring; 521. Limiting ring groove; 53. Positioning groove; 54. Guide hole; 6. Fixing sleeve; 61. Flanged edge; 7. Adjusting assembly; 71. Sealing plate; 711. Sealing gasket; 72. Connecting rod. Detailed Implementation

[0033] The present application will be further described in detail below with reference to all the accompanying drawings.

[0034] Example: Reference Figure 1 and Figure 2 An oxygen shut-off valve includes a valve body 1 with a flow channel 11, a valve cover 2 mounted on the valve body 1, a valve stem 3 penetrating the valve cover 2 and extending into the valve body 1, and a valve disc 4 connected to the end of the valve stem 3 inserted into the valve body 1. The two ends of the flow channel 11 are a lower inlet and an upper outlet, respectively. A valve seat 12 is located below the valve disc 4 inside the valve body 1. An actuator 31 is provided at the outer end of the valve stem 3 to control the reciprocating movement of the valve disc 4 towards the valve seat 12. An anti-rotation component 32 is provided on the inner side of the valve cover 2. The anti-rotation component 32 prevents the valve stem 3 from rotating around its own axis. Operators can operate the actuator 31 to move the valve disc 4 reciprocating towards the valve seat 12, thereby opening and closing the oxygen shut-off valve. The medium enters the valve body 1 through the inlet, passes from top to bottom through the bottom side of the valve seat 12 and the gap between the valve seat 12 and the valve disc 4, and then exits from the outlet.

[0035] Reference Figure 2 The actuator 31 includes an operating handle 311 and an adjusting nut 312. The adjusting nut 312 is threaded onto the threaded portion on the outer end circumference of the valve stem 3. The anti-rotation component 32 prevents the valve stem 3 from rotating synchronously with the operating handle. The operating handle 311 drives the adjusting nut 312 to rotate relative to the valve stem 3. During this process, the valve stem 3 and the valve disc 4 can be raised and lowered, while the operating handle 311 only rotates, thereby adjusting the length of the valve stem 3 within the valve body 1. This is a conventional adjustment structure and will not be described in detail here.

[0036] Reference Figure 2The anti-rotation component 32 includes two anti-rotation sliding rods 321 and an anti-rotation frame 322 fixed to the outer circumference of the valve stem 3 by a pin. One end of the anti-rotation sliding rod 321 is fixed to the inner side of the valve cover 2. The end of the anti-rotation sliding rod 321 near the valve cover 2 is provided with a first screw part 3211. A first threaded groove 21 is opened on the inner side of the valve cover 2 for the first screw part 3211 to be screwed into, thereby realizing the assembly and fixation of the anti-rotation sliding rod 321 and the valve cover 2. The anti-rotation frame 322 is provided with a guide groove 3221 through which the anti-rotation sliding rod 321 passes and slides. When the valve stem 3 moves along its own length direction, it drives the anti-rotation frame 322 to move synchronously.

[0037] Reference Figure 3 and Figure 4 The valve seat 12 has a fixed protruding ring 121 on the side near the valve disc 4, which can abut against the valve disc 4. An annular sealing ring 13 is fitted on the outer circumferential surface of the fixed protruding ring 121. The annular sealing ring 13 is further fixed to the outer circumferential surface of the fixed protruding ring 121 with glue. The annular sealing ring 13 is made of polytetrafluoroethylene, and one side of the annular sealing ring 13 can abut against the side of the valve disc 4. When the oxygen shut-off valve is in the closed state, both the fixed protruding ring 121 and the annular sealing ring 13 abut against the bottom side of the valve disc 4. Through the dual sealing setting of soft seal and hard seal, the sealing performance of the oxygen shut-off valve when it is in the closed state is improved.

[0038] Reference Figure 3 and Figure 4 The valve body 1 has an internal pressure regulating plate 5 with four evenly spaced pressure regulating holes 51. After installation, the outer circumferential surface of the pressure regulating plate 5 is fixedly abutted against the inner wall of the valve seat 12. A retaining ring 122 is fixedly installed on the inner wall of the valve seat 12. The retaining ring 122, the fixing protrusion ring 121, and the valve seat 12 are integrally injection molded. At the same time, a positioning protrusion ring 52 is provided on the side of the pressure regulating plate 5 away from the valve disc 4. The positioning protrusion ring 52 is integrally machined with the pressure regulating plate 5. The outer circumferential surface of the positioning protrusion ring 52 has a limiting ring groove 521 for the retaining ring 122 to be inserted. The valve body 1 has an internal fixing sleeve 6 for fixing the pressure regulating plate 5. One side of the fixing sleeve 6 has a flange 61 that abuts against the side of the retaining ring 122 away from the valve disc 4. The outer circumferential surface of the fixing sleeve 6 has an external thread. The inner wall of the positioning protrusion ring 52 has an internal thread that mates with the thread on the outer circumferential surface of the fixing sleeve 6. When installing and fixing the pressure regulating plate 5, insert the pressure regulating plate 5 into the inside of the valve seat 12 from the upper side of the valve seat 12, and then screw the fixing sleeve 6 into the inner side of the positioning protrusion ring 52 from the lower side of the valve seat 12, thereby realizing the installation and fixing of the pressure regulating plate 5.

[0039] Reference Figure 4The valve body 1 has a first sealing ring 14 inside, which is made of polytetrafluoroethylene. A first mounting groove 1221 is provided on the side of the retaining ring 122 away from the valve disc 4 for the first sealing ring 14 to be inserted and fixed, thereby achieving stability when the retaining ring 122 abuts against the flange 61 of the fixing sleeve 6. Four positioning protrusions 1222 are provided on the side of the retaining ring 122 near the valve disc 4. The positioning protrusions 1222 have a hemispherical shape. A positioning groove 53 is provided on the pressure regulating plate 5 for the positioning protrusions 1222 to be inserted. After the pressure regulating plate 5 is fixed, the positioning protrusions 1222 on the retaining ring 122 are inserted into the positioning groove 53 on the pressure regulating plate 5, thereby further improving the installation stability of the pressure regulating plate 5.

[0040] Reference Figure 4 An elastic sealing ring 15 is provided between the pressure regulating plate 5 and the valve disc 4. The outer circumferential surface of the elastic sealing ring 15 abuts against the inner side wall of the valve seat 12. The elastic sealing gasket 711 is fixedly installed on the side of the pressure regulating plate 5 near the valve disc 4 by adhesive. When the oxygen shut-off valve is in the closed state, the side of the elastic sealing gasket 711 away from the pressure regulating plate 5 abuts against the valve disc 4, thereby further improving the sealing performance of the oxygen shut-off valve when closed.

[0041] Reference Figure 3 and Figure 5 A guide rod 41 is fixedly installed on the side of the valve disc 4 away from the valve stem 3. A guide hole 54 is provided in the middle of the pressure regulating plate 5 for the guide rod 41 to pass through and slide. The outer circumferential surface of the guide rod 41 abuts against the side wall of the guide hole 54. During the reciprocating movement of the valve disc 4 towards the valve seat 12, the guide rod 41 simultaneously inserts into the guide hole 54 and slides, thereby improving the stability of the valve disc 4 during adjustment. A limit ring 42 is threadedly fixed to the end of the guide rod 41 away from the valve disc 4. The outer circumferential surface of the end of the guide rod 41 away from the valve disc 4 has external threads, and the inner side wall of the limit ring 42 has external threads. The limit ring 42 is threaded onto the outer circumferential surface of the guide rod 41, thereby limiting the guide rod 41 during sliding.

[0042] Reference Figure 5 and Figure 6The outer circumferential surface of the guide rod 41 is provided with an adjustment assembly 7 for controlling the opening and closing of the pressure regulating hole 51. The adjustment assembly 7 includes four sealing plates 71 for sealing the pressure regulating hole 51 and a connecting rod 72 for driving the sealing plates 71 to move. One end of the connecting rod 72 is hinged to the outer circumferential surface of the guide rod 41, and the other end of the connecting rod 72 is hinged to one side of the sealing plate 71. The other side of the sealing plate 71 is hinged to the side of the pressure regulating plate 5 near the valve disc 4. A sealing gasket 711 is fixed to the side of the sealing plate 71 near the pressure regulating plate 5 with glue. When the oxygen shut-off valve is in the closed state, the sealing gasket 711 on the sealing plate 71 seals the pressure regulating hole 51. When the oxygen shut-off valve is opened, the guide rod 41 moves away from the pressure regulating plate 5. At this time, the connecting rod 72 drives the sealing plate 71 to rotate away from the pressure regulating plate 5, and the sealing plate 71 releases the sealing of the pressure regulating hole 51. This setting further improves the sealing performance of the oxygen shut-off valve when it is closed.

[0043] Reference Figure 5 and Figure 6 An annular sealing strip 411 is fixed to the outer circumferential surface of the guide rod 41 with adhesive. The outer circumferential surface of the annular sealing strip 411 is inclined and made of polytetrafluoroethylene. When the oxygen shut-off valve is closed, the annular sealing strip 411 abuts against the opening edge of the guide hole 54 near the valve disc 4. At the same time, the connecting rod 72 abuts against the inclined surface of the outer circumference of the annular sealing strip 411 near the side of the guide rod 41, thereby further reducing the possibility of oxygen leakage from the connection gap between the guide rod 41 and the guide hole 54.

[0044] The implementation principle of this application embodiment is as follows: When the oxygen shut-off valve is in the closed state, the annular sealing ring 13, the fixed convex ring 121 and the elastic sealing ring 15 are all pressed against the bottom side of the valve disc 4. Through the soft-hard-soft triple sealing structure, the valve seat 12 and the valve disc 4 are sealed. In addition, the sealing gasket 711 on the sealing plate 71 blocks the pressure regulating hole 51 on the pressure regulating plate 5, thereby comprehensively improving the sealing performance of the oxygen shut-off valve when closed. When the oxygen shut-off valve is in the open state, the valve disc 4 and the guide rod 41 move away from the pressure regulating plate 5. At this time, the connecting rod 72 drives the sealing plate 71 to rotate away from the pressure regulating plate 5, and the sealing plate 71 releases the blockage of the pressure regulating hole 51. This setting further improves the sealing performance of the oxygen shut-off valve when closed. By setting the pressure regulating hole 51 on the pressure regulating plate 5, the pressure of the delivered oxygen can be regulated, and the sealing performance of the oxygen shut-off valve when closed is improved by the regulating component 7.

[0045] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. An oxygen shut-off valve, comprising a valve body (1) having a flow channel (11), a valve cover (2) mounted on the valve body (1), a valve stem (3) penetrating the valve cover (2) and extending into the valve body (1), and a valve disc (4) connected to the inner end of the valve stem (3), wherein the valve body (1) is provided with an anti-rotation component (32) for preventing the valve stem (3) from rotating about its own axis and a valve seat (12) located below the valve disc (4), and the outer end of the valve stem (3) is provided with an actuator (31) for controlling the reciprocating movement of the valve disc (4); characterized in that, The valve seat (12) has a fixed protruding ring (121) on the side near the valve disc (4). The outer circumferential surface of the fixed protruding ring (121) is fixedly fitted with an annular sealing ring (13). The fixed protruding ring (121) and the annular sealing ring (13) can abut against the side of the valve disc (4) on the side near the valve cover (2). The valve body (1) has a pressure regulating plate (5) inside. The pressure regulating plate (5) has several pressure regulating holes (51). The outer circumferential surface of the pressure regulating plate (5) is fixedly abutted against the inner wall of the valve seat (12). The valve disc (4) has a guide rod (41) fixedly fitted on the side away from the valve stem (3). The pressure regulating plate (5) has a guide through hole (54) for the guide rod (41) to pass through and slide. The outer circumferential surface of the guide rod (41) is provided with an adjustment component (7) for controlling the opening and closing of the pressure regulating hole (51). The adjustment component (7) includes a blocking plate (71) for blocking the pressure regulating hole (51) and a connecting rod (72) for driving the blocking plate (71) to move. One end of the connecting rod (72) is hinged to the outer circumferential surface of the guide rod (41), and the other end of the connecting rod (72) is hinged to one side of the blocking plate (71). The other side of the blocking plate (71) is hinged to the side of the pressure regulating plate (5) near the valve disc (4). The blocking plate (71) blocks the pressure regulating hole (51) when the oxygen shut-off valve is closed, and the blocking plate (71) rotates away from the pressure regulating plate (5) when the oxygen shut-off valve is opened.

2. An oxygen shut-off valve according to claim 1, characterized in that, The guide rod (41) has a limiting retaining ring (42) on the outer circumferential surface of the end away from the valve disc (4).

3. An oxygen shut-off valve according to claim 1, characterized in that, The outer circumferential surface of the guide rod (41) is fixedly provided with an annular sealing strip (411); when the oxygen shut-off valve is closed, the annular sealing strip (411) abuts against the opening edge of the guide through hole (54) near the valve disc (4), and the hinge of the connecting rod (72) and the sealing plate (71) abuts against the side of the annular sealing strip (411) away from the pressure regulating plate (5).

4. An oxygen shut-off valve according to claim 1, characterized in that, A retaining ring (122) is fixedly provided on the inner wall of the valve seat (12). A positioning protrusion ring (52) is provided on the side of the pressure regulating plate (5) away from the valve disc (4). A limiting ring groove (521) for inserting the retaining ring (122) is provided on the outer circumferential surface of the positioning protrusion ring (52). A fixing sleeve (6) is provided inside the valve body (1) and inserted into the positioning protrusion ring (52). A flange (61) is provided on one side of the fixing sleeve (6) and abuts against the side of the retaining ring (122) away from the valve disc (4). The outer circumferential surface of the fixing sleeve (6) is fixedly connected to the inner side of the positioning protrusion ring (52).

5. An oxygen shut-off valve according to claim 4, characterized in that, The valve body (1) is provided with a first sealing ring (14) inside, and the retaining ring (122) is provided with a first mounting ring groove (1221) on the side away from the valve disc (4) for the first sealing ring (14) to be inserted and fixed.

6. An oxygen shut-off valve according to claim 4, characterized in that, The retaining ring (122) has several positioning protrusions (1222) on the side near the valve disc (4), and the pressure regulating plate (5) has a positioning groove (53) for the positioning protrusions (1222) to be inserted.

7. An oxygen shut-off valve according to claim 4, characterized in that, The pressure regulating plate (5) is provided with an elastic sealing ring (15) on the side near the valve disc (4), the outer circumference of which abuts against the inner wall of the valve seat (12). One side of the elastic sealing ring (15) can abut against the side of the valve disc (4) near the valve seat (12).

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