Stop valve

Abstract

The stop valve solves the technical problems that in the prior art, the upper limit of temperature and pressure is low, and abrasion and leakage are prone to occurring. The stop valve comprises a valve body, a valve seat, a valve cover and a valve rod. The valve body comprises a first channel and a second channel which are communicated with each other, the valve seat is located at the joint of the first channel and the second channel, the valve seat and the valve cover are detachably matched with the valve body, the valve rod is in sliding fit with the valve cover so that the valve rod can be close to or away from the valve seat, and when the valve rod is close to the valve seat, the valve rod can cut off the first channel and the second channel. All parts of the stop valve are detachably matched, so that the valve seat can be taken out for hard alloy surfacing, the use temperature and pressure of the stop valve are greatly improved, and the service life of the stop valve can be effectively prolonged.

Description

Technical Field

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

[0002] The national standard "Marine external thread forged steel stop valve" (GB / T 594-2008) discloses a stop valve, the main features of which are as follows:

[0003] 1. In this standard, when the design pressure is 10MPa, the A-type straight-through external thread stop valve includes 6 diameters (DN6, DN10, DN15, DN20, DN25, DN32), and the applicable media are fuel oil, lubricating oil, fresh water, and air;

[0004] 2. In this standard, when the design pressure is 4MPa, the A-type straight-through external thread stop valve includes 4 diameters (DN15, DN20, DN25, DN32), and the applicable media are fuel oil, lubricating oil, fresh water, air and steam with a temperature not higher than 250℃;

[0005] 3. The main materials of the stop valve are 20Cr13 and 20 steel;

[0006] 4. The stop valve is mainly composed of valve body, valve cover, valve disc, valve stem and packing.

[0007] This type of stop valve has at least the following problems when used as a high-temperature valve (the applicable medium is high-temperature steam): (1) The upper limits of the design temperature and pressure are low, only 4 MPa and 250°C; (2) The first mating surface between the valve body and the valve disc is 20 steel to 20Cr13, and the first mating surface has a short service life and is prone to wear, resulting in leakage. Summary of the invention

[0008] In order to solve the above technical problems, the present application provides a stop valve.

[0009] The technical solution adopted to achieve the purpose of this application is that the present invention discloses a stop valve, comprising:

[0010] A valve body, the valve body comprising a first channel and a second channel that are interconnected;

[0011] A valve seat, the valve seat and the valve body are detachably matched;

[0012] a valve cover, wherein the valve cover is detachably matched with the valve body and the valve cover is located at the connection between the first channel and the second channel; and

[0013] A valve stem is movable along the valve cover so that the valve stem can approach or move away from the valve seat, and the first channel and the second channel can be cut off when the valve stem abuts against the valve seat.

[0014] Furthermore, the valve seat is located between the valve body and the valve cover, and the valve cover can squeeze and fix the valve seat when connected to the valve body.

[0015] Furthermore, an annular boss is provided on the valve body, a first mating surface for mating with the valve stem is provided on the annular boss, the first mating surface is inclined, and a second mating surface for mating with the first mating surface is provided below the valve seat.

[0016] Further, the first matching surface is inclined inwardly from the valve seat toward the valve stem, and the second matching surface is located on the inner side wall of the valve seat.

[0017] Furthermore, a gasket is provided on the valve body, and the gasket is located outside the annular boss.

[0018] Furthermore, a valve flap is provided at one end of the valve stem facing the valve seat, and the first channel and the second channel are cut off when the valve flap abuts against the valve seat. The valve flap movably cooperates with the valve stem to enable the valve flap to rotate or move.

[0019] Furthermore, the valve flap and the valve stem are detachably matched.

[0020] Furthermore, a mounting cavity is provided on the valve stem, and a first matching portion is provided at the cavity opening of the mounting cavity;

[0021] The first end of the valve flap is provided with a second matching portion for matching with the first matching portion, and the second matching portion matches with the first matching portion so that the valve flap is connected to the valve stem, and the first end of the valve flap can rotate or move in the installation cavity.

[0022] Furthermore, one of the end surface of the first end of the valve flap and the bottom wall of the installation cavity is configured as a curved surface, and the curved surface protrudes toward the other.

[0023] Furthermore, a first hard alloy surfacing sealing surface is provided at the bottom of the valve disc, the first hard alloy surfacing sealing surface is inclined, and a second hard alloy surfacing sealing surface is provided at the top of the valve seat, the second hard alloy surfacing sealing surface cooperates with the first hard alloy surfacing sealing surface to cut off the first channel and the second channel.

[0024] It can be seen from the above technical solution that the various components of the stop valve disclosed in the present application are detachably matched, so that the valve seat can be removed for hard alloy cladding, thereby greatly improving the operating temperature and pressure of the stop valve and effectively extending the service life of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a stop valve in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A partial enlarged schematic diagram of

[0027] Figure 3 This is a schematic diagram of a valve body in an embodiment of the present application;

[0028] Figure 4 Based Figure 3 A partial enlarged schematic diagram of

[0029] Figure 5 A schematic diagram of a valve seat in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of a valve stem in an embodiment of the present application;

[0031] Figure 7 Schematic diagram of the valve disc in the embodiment of the present application

[0032] Description of reference numerals:

[0033] 100-valve body, 101-flexible graphite winding sheet, 102-packing seat, 103-flexible graphite braided packing, 104-pressure nut, 105-packing gland, 106-first channel, 107-second channel, 108-gasket, 109-annular boss, 110-first mating surface, 200-valve seat, 201-second mating surface, 202-second hard alloy cladding sealing surface, 300-valve cover, 400-valve stem, 401-first mating part, 402-installation cavity, 500-valve disc, 501-second mating part, 502-first hard alloy cladding sealing surface, 600-handwheel. DETAILED DESCRIPTION

[0034] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0035] See also Figures 1 to 7 In the embodiment of the present application, the stop valve includes a valve body 100, a valve seat 200, a valve cover 300 and a valve stem 400. The valve body 100 includes a first channel 106 and a second channel 107 that are interconnected. The valve seat 200 is located at the connection between the first channel 106 and the second channel 107. The valve seat 200 and the valve cover 300 are both detachably matched with the valve body 100. The valve stem 400 is slidably matched with the valve cover 300 so that the valve stem 400 can approach or move away from the valve seat 200. When the valve stem 400 approaches the valve seat 200, the valve stem 400 can cut off the first channel 106 and the second channel 107.

[0036] Through the above embodiments, the present application has the following beneficial effects or advantages: the various components of the stop valve disclosed in the present application are detachably matched, so that the valve seat 200 can be taken out for hard alloy surfacing, thereby greatly improving the operating temperature and pressure of the stop valve, and can effectively extend the service life of the stop valve.

[0037] See also Figures 1 to 4 The valve body 100 includes a first channel 106 and a second channel 107 that are interconnected. The first channel 106 and the second channel 107 can be parallel to each other or perpendicular to each other. The valve seat 200 is installed at the connection between the first channel 106 and the second channel 107, and the valve seat 200 and the valve body 100 are detachably matched. In this embodiment, the valve seat 200 can be fixed on the valve body 100 by using the pressure of the valve cover 300 on the valve seat 200. Since the valve seat 200 is a detachable component, the valve seat 200 can be easily removed for surfacing treatment, thereby ensuring the overall sealing and service life of the stop valve.

[0038] The valve cover 300 and the valve body 100 are also detachably matched to facilitate the disassembly and assembly of the valve seat 200. In this embodiment, the valve cover 300 and the valve body 100 can be connected by threading. Of course, in other embodiments, flange connection or clamping can also be used. The valve cover 300 can be set to a stepped shape, and the shape of the corresponding position of the valve body 100 can be adapted to the valve cover 300.

[0039] A flexible graphite wrapping sheet 101 can be placed at the stepped position of the valve cover 300 . The flexible graphite wrapping sheet 101 can increase the sealing performance of the connection between the valve cover 300 and the valve body 100 , and the elastic force of the flexible graphite wrapping sheet 101 can make the threaded connection between the valve cover 300 and the valve body 100 more stable.

[0040] The valve cover 300 is a hollow structure, and the valve stem 400 is installed in the hollow position. The valve stem 400 can move along the valve cover 300 so that the valve stem 400 can be close to or away from the valve seat 200. In this embodiment, the valve stem 400 and the valve cover 300 can be connected by threads, and the position of the valve stem 400 can be controlled by rotating the valve stem 400, making the control more convenient and accurate.

[0041] A hand wheel 600 is provided at the first end of the valve stem 400 for controlling the valve stem 400. The second end of the valve stem 400 is disposed toward the valve seat 200. When the valve stem 400 moves, the second end thereof can abut against the valve seat 200, thereby blocking the first channel 106 and the second channel 107.

[0042] Since the valve cover 300 is stepped, in this embodiment, the lower diameter of the valve cover 300 can be made smaller than the upper diameter thereof, and the thread for cooperating with the valve stem 400 is set at the lower part of the valve cover 300. Based on this, when the valve stem 400 is installed on the valve cover 300, there is a gap between the upper part of the valve cover 300 and the valve stem 400, and at this time, the packing seat 102 and the flexible graphite braided packing 103 can be filled into the gap to enhance the sealing performance. Only by using the clamping nut 104 to compress the flexible graphite braided packing 103, and finally using the packing gland 105 to fix the packing seat 102, the flexible graphite braided packing 103 and the clamping nut 104. In this embodiment, the packing gland 105 can be connected to the valve cover 300, and it can be fixed by threaded connection. Of course, in other embodiments, the packing gland 105 can also be directly connected to the valve body 100, and a detachable method such as threaded connection or flange connection is possible.

[0043] See also Figure 1 , Figure 2 and Figure 5 , an annular convex seat 109 for cooperating with the valve seat 200 is provided on the valve body 100, and the valve seat 200 is placed on the annular convex seat 109, and after being squeezed by the valve cover 300, the sealing of the stop valve can be effectively guaranteed. Among them, in this embodiment, the valve seat 200 can also be set to be annular, and its lower surface is used to cooperate with the annular convex seat 109, and its upper surface is used to cooperate with the valve stem 400. A first matching surface 110 for cooperating with the valve stem 400 is provided on the top of the annular convex seat 109, and the first matching surface 110 is inclined. In this way, the sealing can be further improved by squeezing the valve seat 200 by the valve cover 300 and the squeezing between the valve seat 200 and the annular convex seat 109. A second matching surface 201 for cooperating with the first matching surface 110 is provided below the valve seat 200, and the second matching surface 201 cooperates with the first matching surface 110 to achieve sealing.

[0044] See also Figure 5 and Figure 7In this embodiment, the first mating surface 110 can be tilted inward from the valve seat 200 toward the valve stem 400, that is, the first mating surface 110 is located on the outside of the annular convex seat 109. At this time, the second mating surface 201 can be set on the inner side wall of the valve seat 200, and the second mating surface 201 is parallel to the first mating surface 110. When the valve seat 200 is squeezed by the valve cover 300 and the valve stem 400, the second mating surface 201 and the first mating surface 110 will be pressed tighter and tighter, thereby ensuring the sealing of the stop valve. Of course, setting the first mating surface 110 on the outside of the annular convex seat 109 is only one embodiment of this embodiment. In other embodiments, it is also possible to set the first mating surface 110 on the inside of the annular convex seat 109, and the position of the second mating surface 201 can be adjusted accordingly. Compared with the horizontal first mating surface 110, the inclined first mating surface 110 ensures that when the valve seat 200 is squeezed, it has a certain amount of room for movement, thereby finding a better sealing position and avoiding the valve seat 200 from tilting when the force is uneven.

[0045] When the valve seat 200 abuts against the annular convex seat 109, its outer side is in a suspended state. When the valve cover 300 applies a downward extrusion force to the outer side of the valve seat 200 at this time, the valve seat 200 may be tilted. To this end, a gasket 108 can be set on the outer side of the annular convex seat 109. The position of the gasket 108 is just below the outer side of the valve seat 200 to support the outer side of the valve seat 200, thereby preventing the valve seat 200 from tilting. The shape of the gasket 108 can be set in various forms as needed. For example, the gasket 108 can be set in a ring shape, or the gasket 108 can be set in multiple forms, and multiple gaskets 108 are evenly distributed on the outer side of the annular convex seat 109. These settings can support the valve seat 200 and prevent the valve seat 200 from tilting. It should be noted that when the gasket 108 is set in a ring shape, after the valve seat 200 and the gasket 108 are tightly pressed, a secondary seal can be formed, thereby further improving the sealing effect.

[0046] See also Figure 2 A valve flap 500 is provided on the side of the valve stem 400 facing the valve seat 200, and the valve flap 500 and the valve stem 400 are movably matched to enable the valve flap 500 to rotate or move. When the valve flap 500 abuts against the valve seat 200, the first channel 106 and the second channel 107 are cut off. The use of the movable valve flap 500 and the valve seat 200 to cooperate can improve the centering performance of the valve flap 500, enhance the reliability of the seal, and reduce the opening and closing torque of the stop valve. Of course, making the valve flap 500 and the valve stem 400 movably connected is only one implementation in this embodiment. In other implementations, it is also possible to make the valve flap 500 and the valve stem 400 fixedly connected.

[0047] Since the second end of the valve flap 500 needs to abut against the valve seat 200 to form a seal, and the first end of the valve flap 500 needs to move relative to the valve stem 400, the wear of the valve flap 500 is greater than that of other components. Therefore, the valve flap 500 and the valve stem 400 can be set to be detachable to facilitate replacement of the valve flap 500.

[0048] Specifically, a mounting cavity 402 may be provided at the second end of the valve stem 400, and a first matching portion 401 may be provided at the cavity opening of the mounting cavity 402. A second matching portion 501 for matching with the first matching portion 401 is provided at the end of the first end of the valve flap 500, and the second matching portion 501 matches with the first matching portion 401 so that the valve flap 500 is connected to the valve stem 400, and the first end of the valve flap 500 can rotate or move in the mounting cavity 402.

[0049] See also Figure 6 and Figure 7 In one implementation of this embodiment, the first matching portion 401 can be set as an internal thread, and the second matching portion 501 can be set as an external thread. It should be noted that the height of the first matching portion 401 is smaller than the height of the installation cavity 402 as a whole, and the height of the second matching portion 501 is less than or equal to the difference between the height of the installation cavity 402 and the height of the first matching portion 401, so that after the first end of the valve flap 500 enters the installation cavity 402 through the matching of the second matching portion 501 and the first matching portion 401, the second matching portion 501 can be completely separated from the first matching portion 401, and the valve flap 500 can rotate or slightly tilt in the installation cavity 402. Of course, setting the first matching portion 401 and the second matching portion 501 as an internal thread and an external thread respectively is only one way in this embodiment. In other embodiments, the first matching portion 401 and the second matching portion 501 can also be set to a semicircular protrusion or other structure, so that the valve flap 500 can enter or leave the installation cavity 402 after being subjected to a predetermined pressure, and when the first end of the valve flap 500 is located in the installation cavity 402, it can move relative to the valve stem 400.

[0050] See also Figure 7 In order to make the movement of the valve flap 500 in the installation cavity 402 more stable, one of the end surface of the first end of the valve flap 500 and the bottom wall of the installation cavity 402 can be set as an arc surface, and the arc surface is convex toward the other. In this embodiment, the arc surface can be set at the first end of the valve flap 500, and the arc surface is set toward the bottom wall of the installation cavity 402. During the sealing process, when the valve flap 500 moves or rotates slightly, the first end of the valve flap 500 will always abut against the bottom wall of the installation cavity 402, thereby ensuring the reliability of the abutment between the valve flap 500 and the valve seat 200.

[0051] In other embodiments, it is also possible to set a curved surface on the bottom wall of the installation cavity 402. In this case, the bottom wall of the installation cavity 402 will protrude toward its cavity opening. When the valve flap 500 moves or rotates slightly, the first end of the valve flap 500 will always abut against the bottom wall of the installation cavity 402.

[0052] See also Figure 7 and Figure 5 A first hard alloy cladding sealing surface 502 is provided at the bottom of the valve disc 500. The first hard alloy cladding sealing surface 502 is provided on the outer peripheral wall of the valve disc 500, and the first hard alloy cladding sealing surface 502 is inclined outward from the valve disc 500 toward the valve stem 400. The first hard alloy cladding sealing surface 502 is inclined, and a second hard alloy cladding sealing surface 202 is provided on the top of the valve seat 200. The second hard alloy cladding sealing surface 202 cooperates with the first hard alloy cladding sealing surface 502 to cut off the first channel 106 and the second channel 107. By providing a hard alloy cladding surface, the use temperature and pressure of the stop valve can be greatly improved.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A stop valve, characterized in that: include: A valve body, the valve body comprising a first channel and a second channel that are interconnected; A valve seat, the valve seat and the valve body are detachably matched; A valve cover, the valve cover is detachably matched with the valve body, and the valve cover is located at the connection between the first channel and the second channel; as well as A valve stem is movable along the valve cover so that the valve stem can approach or move away from the valve seat, and the first channel and the second channel can be cut off when the valve stem abuts against the valve seat.

2. The stop valve according to claim 1, characterized in that: The valve seat is located between the valve body and the valve cover, and the valve cover can be pressed and fixed to the valve seat when connected to the valve body.

3. The stop valve according to claim 1, characterized in that: The valve body is provided with an annular convex seat, and the annular convex seat is provided with a first matching surface for matching with the valve stem, the first matching surface is arranged obliquely, and a second matching surface for matching with the first matching surface is arranged below the valve seat.

4. The stop valve according to claim 3, characterized in that: The first matching surface is inclined inwardly from the valve seat toward the valve stem, and the second matching surface is located on the inner side wall of the valve seat.

5. The stop valve according to claim 4, characterized in that: A gasket is arranged on the valve body and is located outside the annular convex seat.

6. The stop valve according to any one of claims 1 to 5, characterized in that: A valve flap is provided at one end of the valve stem facing the valve seat. When the valve flap abuts against the valve seat, the first channel and the second channel are cut off. The valve flap movably cooperates with the valve stem so that the valve flap can rotate or move.

7. The stop valve according to claim 6, characterized in that: The valve flap is detachably matched with the valve stem.

8. The stop valve according to claim 7, characterized in that: The valve stem is provided with a mounting cavity, and a first matching portion is provided at the cavity opening of the mounting cavity; The first end of the valve flap is provided with a second matching portion for matching with the first matching portion, and the second matching portion matches with the first matching portion so that the valve flap is connected to the valve stem, and the first end of the valve flap can rotate or move in the installation cavity.

9. The stop valve according to claim 8, characterized in that: One of the end surface of the first end of the valve flap and the bottom wall of the installation cavity is configured as a curved surface, and the curved surface protrudes toward the other.

10. The stop valve according to claim 6, characterized in that: A first hard alloy surfacing sealing surface is arranged at the bottom of the valve disc, and the first hard alloy surfacing sealing surface is arranged obliquely. A second hard alloy surfacing sealing surface is arranged at the top of the valve seat, and the second hard alloy surfacing sealing surface cooperates with the first hard alloy surfacing sealing surface to cut off the first channel and the second channel.

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