Forged Steel Gate Valve

Abstract

The utility model discloses a forged steel gate valve, including a valve body, a valve cover, a valve stem and a gate plate. The valve stem passes through the valve cover and extends into the interior of the valve body to be linked with the gate plate. The gate plate includes an installation middle plate, two sealing plates, an upper limit plate and a lower limit plate. The installation middle plate is linked with the inner end of the valve stem. The two sealing plates are respectively connected to the two sides of the installation middle plate through elastic components. A floating gap is provided between the sealing plate and the installation middle plate. The upper limit plate and the lower limit plate are respectively installed at the upper and lower ends of the installation middle plate. The upper and lower ends of the sealing plate are respectively provided with an upper limit step and a lower limit step. An upper limit flange is respectively provided at both ends of the upper limit plate, and a lower limit flange is respectively provided at both ends of the lower limit plate. The utility model adopts a split floating gate plate structure, the size of which can be automatically adjusted according to the installation environment, so as to achieve accurate and effective cooperation with the valve seat, ensure good sealing when the valve is closed, and avoid the scrapping of the gate plate due to production size deviation.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a forged steel gate valve. Background Art

[0002] The opening and closing parts of the forged steel gate valve are the gate disc, and the movement direction of the gate disc is perpendicular to the direction of the fluid. The forged steel gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The advantages of the forged steel gate valve are small fluid resistance; the external force required for opening and closing is small; the flow direction of the medium is not restricted; when fully opened, the sealing surface is less eroded by the working medium than the stop valve; the shape is relatively simple, and the casting processability is better.

[0003] In order to ensure the sealing performance when closed, most of the forged steel gate valves on the market now have the sealing surfaces on both sides of the gate designed to be inclined. In this way, when cooperating with the valve seat, it can not only achieve sealing, but also reduce wear, thereby extending the service life of the valve. However, most gates adopt an integrated structure, and the size cannot be changed after processing. However, in actual production, the gate size often deviates, resulting in an inability to achieve precise cooperation with the valve seat, causing the gate to be scrapped. Utility Model Content

[0004] The purpose of the utility model is to provide a forged steel gate valve. The utility model adopts a split floating gate structure, the size of which can be automatically adjusted according to the installation environment to achieve accurate and effective cooperation with the valve seat, ensure good sealing when the valve is closed, and avoid the gate being scrapped due to production size deviation.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a forged steel gate valve, comprising a valve body, a valve cover, a valve stem and a gate plate, wherein the two ends of the valve body are provided with a first flow channel and a second flow channel which are interconnected, the valve cover is installed on the upper part of the valve body, the valve stem passes through the valve cover and extends into the interior of the valve body and is linked to the gate plate, the first flow channel and the second flow channel are respectively provided with a valve seat which is used to form a sealing fit with the gate plate when the valve is closed; the gate plate comprises an installation middle plate, two sealing plates, an upper limit plate and a lower limit plate, the installation middle plate is linked to the inner end of the valve stem, the two sealing plates are connected to the inner end of the valve stem, and the valve stem is connected to the gate plate. A sealing plate is respectively connected to both sides of the mounting middle plate through an elastic component, and a floating gap is provided between the sealing plate and the mounting middle plate, the upper limit plate and the lower limit plate are respectively installed at the upper and lower ends of the mounting middle plate, the upper end and the lower end of the sealing plate are respectively provided with an upper limit step and a lower limit step, and the two ends of the upper limit plate are respectively provided with an upper limit flange extending downward to form a travel limit for the upper limit steps of the two sealing plates, and the two ends of the lower limit plate are respectively provided with a lower limit flange extending upward to form a travel limit for the lower limit steps of the two sealing plates.

[0006] By adopting the above technical solution, the gate is designed into a split floating structure. When in use, the gate is driven by the valve stem, and the narrower part of its bottom end first extends into the position between the two valve seats. As the gate moves downward, when the sealing plate on the gate is pressed against the corresponding valve seat, the elastic component will contract and store energy, and the sealing plate will also move inward. When the gate is fully in place, the elastic force of the elastic component presses the sealing plate against the corresponding valve seat, thereby achieving accurate and effective coordination between the gate and the valve seat, ensuring good sealing when the valve is closed, and avoiding the scrapping of the gate due to production size deviation.

[0007] The utility model is further configured such that a rectangular guide protrusion is provided on the inner side of the sealing plate, a rectangular guide recess is provided on the installation middle plate to match the rectangular guide protrusion, and an extension direction of the rectangular guide recess is perpendicular to the sealing surface of the valve seat.

[0008] By adopting the above technical solution, the movement of the sealing plate can be guided so that it can only move in the direction close to or away from the valve seat sealing surface, thereby ensuring effective opening and closing of the valve.

[0009] The utility model is further configured as follows: the elastic component includes a spring and a plug, a through hole is provided in the middle of the gate plate, a threaded groove is provided at the outer end of the through hole, the plug is threadedly connected to the threaded groove, a sealing protrusion extending into the through hole is provided on the plug, and a first sealing ring for sealing with the inner wall of the through hole is installed on the outer periphery of the sealing protrusion, one end of the spring is tightly pressed against the inner end of the plug, and the other end of the spring is tightly pressed against the side of the installation middle plate.

[0010] By adopting the above technical solution, not only is the installation very convenient, but also the preload force of the spring can be adjusted by adjusting the axial position of the plug, so as to cope with different medium pressure environments.

[0011] The utility model is further configured that a first gasket is sandwiched between the spring and the plug.

[0012] By adopting the above technical solution, the first gasket can protect the plug and also evenly transmit the spring force to the sealing plate.

[0013] The utility model is further configured such that the elastic component also includes a guide column, the guide column is provided with a threaded section, the installation middle plate is provided with a screw hole, the threaded section on the guide column is threadedly connected to the screw hole, and the spring portion is sleeved on the outer periphery of the guide column.

[0014] By adopting the above technical solution, the guide column plays a guiding role for the spring, which not only ensures the stability of its installation, but also prevents it from deviating from the position of the central axis, thereby increasing its service life.

[0015] The utility model is further configured that a hexagonal operating portion is provided at one end of the guide column away from the threaded section.

[0016] By adopting the above technical solution, a hexagonal operating portion is provided on the guide column, which is convenient for the wrench to clamp and rotate, thereby making it easier to disassemble and assemble.

[0017] The utility model is further configured such that the upper end of the mounting middle plate is threadedly connected to the valve stem, and the valve stem is provided with an annular protrusion extending toward the outer periphery, and the upper limit plate is clamped between the mounting middle plate and the annular protrusion; the lower limit plate is connected to the lower end of the mounting middle plate by a locking screw, and the upper limit plate is parallel to the lower limit plate.

[0018] By adopting the above technical solution, the connection structure is simple and reliable, and disassembly and assembly are very convenient.

[0019] The utility model is further configured such that an annular groove is provided on the inner wall of the valve body corresponding to a position above the valve cover, a four-open ring is embedded in the annular groove, a pressure cover is provided on the inner wall of the valve body corresponding to a position on the upper end of the four-open ring, the pressure cover is locked and connected to the valve cover by bolts, the outer periphery of the upper end of the valve cover and the inner side of the valve body form a conical groove which is larger at the top and smaller at the bottom, a self-sealing ring is embedded in the conical groove, and a second gasket is sandwiched between the self-sealing ring and the four-open ring.

[0020] By adopting the above technical solution, self-sealing between the valve cover and the valve body can be achieved, the sealing effect is good, and the leakage of the internal medium from the gap between the valve cover and the valve body is effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the gate of the utility model;

[0023] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0024] In the figure: 1, valve body; 2, valve cover; 3, valve stem; 4, gate; 5, first flow channel; 6, second flow channel; 7, valve seat; 8, installation middle plate; 9, sealing plate; 10, upper limit plate; 11, lower limit plate; 12, elastic component; 13, floating gap; 14, upper limit step; 15, lower limit step; 16, upper limit flange; 17, lower limit flange; 18, rectangular guide protrusion; 19, rectangular guide recess; 2 0. Spring; 21. Plug; 22. Through hole; 23. Threaded groove; 24. Sealing convex part; 25. First sealing ring; 26. First gasket; 27. Guide column; 28. Threaded section; 29. ​​Screw hole; 30. Hexagonal operating part; 31. Annular protrusion; 32. Locking screw; 33. Annular groove; 34. Four open rings; 35. Pressure cover; 36. Bolt; 37. Conical groove; 38. Self-sealing ring; 39. Second gasket. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example: As shown in the attached Figures 1 to 3The forged steel gate valve shown in the figure comprises a valve body 1, a valve cover 2, a valve stem 3 and a gate plate 4. The two ends of the valve body 1 are provided with a first flow channel 5 and a second flow channel 6 which are interconnected. The valve cover 2 is installed on the upper part of the valve body 1. The valve stem 3 penetrates the valve cover 2 and extends into the interior of the valve body 1 to be linked with the gate plate 4. The gate plate 4 is wedge-shaped with a larger upper portion and a smaller lower portion as a whole. The first flow channel 5 and the second flow channel 6 are respectively provided with a valve seat 7 for forming a sealing fit with the gate plate 4 when the valve is closed. The two valve seats 7 are respectively welded in the corresponding flow channels; the gate plate 4 comprises an installation middle plate 8, two sealing plates 9, an upper limit plate 10 and a lower limit plate 11. The installation middle plate 8 is linked with the inner end of the valve stem 3. The two sealing plates 9 They are respectively connected to the two sides of the mounting middle plate 8 through elastic components 12, and a floating gap 13 is provided between the sealing plate 9 and the mounting middle plate 8. The upper limit plate 10 and the lower limit plate 11 are respectively installed at the upper and lower ends of the mounting middle plate 8. The upper end and the lower end of the sealing plate 9 are respectively provided with an upper limit step 14 and a lower limit step 15, and the two ends of the upper limit plate 10 are respectively provided with an upper limit flange 16 extending downward to form a stroke limit for the upper limit steps 14 of the two sealing plates 9. The two ends of the lower limit plate 11 are respectively provided with a lower limit flange 17 extending upward to form a stroke limit for the lower limit steps 15 of the two sealing plates 9, and the upper limit flange 16 is parallel to the lower limit flange 17. The gate plate 4 is designed as a split floating structure. When in use, the gate plate 4 is driven by the valve stem 3, and the narrower part of its bottom end first extends into the position between the two valve seats 7. As the gate plate 4 moves downward, when the sealing plate 9 on the gate plate 4 is pressed against the corresponding valve seat 7, the elastic component 12 will shrink and store energy, and the sealing plate 9 will also move inward. When the gate plate 4 is fully in place, the elastic force of the elastic component 12 presses the sealing plate 9 against the corresponding valve seat 7, thereby achieving accurate and effective cooperation between the gate plate 4 and the valve seat 7, ensuring good sealing when the valve is closed, and avoiding the scrapping of the gate plate 4 due to production size deviation.

[0027] As attached Figure 2 As shown, a rectangular guide protrusion 18 is provided inside the sealing plate 9, and a rectangular guide recess 19 matching the rectangular guide protrusion 18 is provided on the installation middle plate 8, that is, the cross-sections of the rectangular guide protrusion 18 and the rectangular guide recess 19 are rectangular, and the extending direction of the rectangular guide recess 19 is perpendicular to the sealing surface of the valve seat 7. This design can guide the movement of the sealing plate 9 so that it can only move in the direction close to or away from the sealing surface of the valve seat 7, thereby ensuring the effective opening and closing of the valve.

[0028] As attached Figure 2As shown, the elastic component 12 includes a spring 20 and a plug 21, a through hole 22 is provided in the middle of the gate plate 4, a thread groove 23 is provided at the outer end of the through hole 22, the inner diameter of the thread groove 23 is larger than the inner diameter of the through hole 22, the plug 21 is threadedly connected to the thread groove 23, a sealing convex portion 24 extending into the through hole 22 is provided on the plug 21, the shape of the sealing convex portion 24 is a cylindrical structure adapted to the shape of the through hole 22, and a first sealing ring 25 for forming a sealing match with the inner wall of the through hole 22 is installed on the outer periphery of the sealing convex portion 24, one end of the spring 20 is tightly pressed against the inner end of the plug 21, and the other end of the spring 20 is tightly pressed against the side of the installation middle plate 8. This design is not only very convenient to install, but also the preload force of the spring 20 can be adjusted by adjusting the axial position of the plug 21, so as to cope with different medium pressure environments.

[0029] As attached Figure 2 As shown, a first washer 26 is sandwiched between the spring 20 and the plug 21. The first washer 26 is a metal washer. The first washer 26 can protect the plug 21 and evenly transfer the force of the spring 20 to the sealing plate 9.

[0030] As attached Figure 2 As shown, the elastic component 12 further includes a guide column 27, a threaded section 28 is provided on the guide column 27, a screw hole 29 is provided on the installation middle plate 8, the threaded section 28 on the guide column 27 is threadedly connected to the screw hole 29, and the spring 20 is partially sleeved on the outer periphery of the guide column 27. The guide column 27 guides the spring 20, which not only ensures the stability of its installation, but also prevents it from deviating from the position of the central axis direction, thereby improving its service life.

[0031] As attached Figure 2 As shown, the end of the guide column 27 away from the threaded section 28 is provided with a hexagonal operating portion 30. The hexagonal operating portion 30 is provided on the guide column 27, which is convenient for the wrench to clamp and rotate, thereby being more conducive to its disassembly and assembly.

[0032] As attached Figure 2 As shown, the upper end of the installation middle plate 8 is threadedly connected with the valve stem 3, and the valve stem 3 is provided with an annular protrusion 31 extending toward the periphery, and the upper limit plate 10 is sandwiched between the installation middle plate 8 and the annular protrusion 31; the lower limit plate 11 is connected to the lower end of the installation middle plate 8 by a locking screw 32, that is, the lower limit plate 11 is provided with a threaded hole, the valve stem 3 has an external thread matching the threaded hole, and the upper limit plate 10 is parallel to the lower limit plate 11. The design connection structure is simple and reliable, and it is very convenient to disassemble and assemble.

[0033] As attached Figure 1 and attached Figure 3As shown, the inner wall of the valve body 1 is provided with an annular groove 33 at a position corresponding to the upper part of the valve cover 2, and a four-open ring 34 is embedded in the annular groove 33. The inner wall of the valve body 1 is provided with a gland 35 at a position corresponding to the upper end of the four-open ring 34. The gland 35 is locked and connected with the valve cover 2 through bolts 36. The outer periphery of the upper end of the valve cover 2 and the inner side of the valve body 1 form a tapered groove 37 with a larger upper part and a smaller lower part. A self-sealing ring 38 is embedded in the tapered groove 37, and a second gasket 39 is sandwiched between the self-sealing ring 38 and the four-open ring 34. The tighter the bolt 36 is screwed, the greater the clamping force between the valve cover 2 and the four-open ring 34, and the better the sealing effect. This design can realize the self-sealing between the valve cover 2 and the valve body 1, with good sealing effect, and effectively prevent the internal medium from leaking from the gap between the valve cover 2 and the valve body 1.

Claims

1. A forged steel gate valve, comprising a valve body (1), a valve cover (2), a valve stem (3) and a gate plate (4), wherein the valve body (1) is provided with a first flow channel (5) and a second flow channel (6) which are interconnected at both ends, the valve cover (2) is mounted on the upper part of the valve body (1), the valve stem (3) penetrates the valve cover (2) and extends into the interior of the valve body (1) to be linked with the gate plate (4), and the first flow channel (5) and the second flow channel (6) are respectively provided with a valve seat (7) for forming a sealing fit with the gate plate (4) when the valve is closed; characterized in that: The gate plate (4) comprises a mounting middle plate (8), two sealing plates (9), an upper limit plate (10) and a lower limit plate (11); the mounting middle plate (8) is linked to the inner end of the valve stem (3); the two sealing plates (9) are respectively connected to the two sides of the mounting middle plate (8) through elastic components (12); a floating gap (13) is provided between the sealing plate (9) and the mounting middle plate (8); the upper limit plate (10) and the lower limit plate (11) are respectively installed on the mounting middle plate (8) The upper and lower ends of the sealing plate (9) are respectively provided with an upper limit step (14) and a lower limit step (15), and both ends of the upper limit plate (10) are respectively provided with an upper limit flange (16) extending downward for constituting a travel limit for the upper limit steps (14) of the two sealing plates (9), and both ends of the lower limit plate (11) are respectively provided with a lower limit flange (17) extending upward for constituting a travel limit for the lower limit steps (15) of the two sealing plates (9).

2. The forged steel gate valve according to claim 1, characterized in that: A rectangular guide protrusion (18) is provided on the inner side of the sealing plate (9), and a rectangular guide recess (19) matching the rectangular guide protrusion (18) is provided on the mounting middle plate (8), wherein the extending direction of the rectangular guide recess (19) is perpendicular to the sealing surface of the valve seat (7).

3. The forged steel gate valve according to claim 2, characterized in that: The elastic component (12) includes a spring (20) and a plug (21); a through hole (22) is provided in the middle of the gate plate (4); a threaded groove (23) is provided at the outer end of the through hole (22); the plug (21) is threadedly connected to the threaded groove (23); a sealing protrusion (24) extending into the through hole (22) is provided on the plug (21); a first sealing ring (25) for forming a sealing fit with the inner wall of the through hole (22) is installed on the outer periphery of the sealing protrusion (24); one end of the spring (20) is tightly pressed against the inner end of the plug (21); and the other end of the spring (20) is tightly pressed against the side of the mounting middle plate (8).

4. The forged steel gate valve according to claim 3, characterized in that: A first gasket (26) is sandwiched between the spring (20) and the plug (21).

5. The forged steel gate valve according to claim 3, characterized in that: The elastic component (12) also includes a guide column (27), the guide column (27) is provided with a threaded section (28), the mounting middle plate (8) is provided with a screw hole (29), the threaded section (28) on the guide column (27) is threadedly connected to the screw hole (29), and the spring (20) is partially sleeved on the outer periphery of the guide column (27).

6. The forged steel gate valve according to claim 5, characterized in that: A hexagonal operating portion (30) is provided at one end of the guide column (27) away from the threaded section (28).

7. The forged steel gate valve according to claim 1, characterized in that: The upper end of the mounting middle plate (8) is threadedly connected to the valve stem (3), and the valve stem (3) is provided with an annular protrusion (31) extending toward the outer circumference, and the upper limit plate (10) is clamped between the mounting middle plate (8) and the annular protrusion (31); the lower limit plate (11) is connected to the lower end of the mounting middle plate (8) by a locking screw (32), and the upper limit plate (10) is parallel to the lower limit plate (11).

8. The forged steel gate valve according to claim 1, characterized in that: An annular groove (33) is provided on the inner wall of the valve body (1) at a position corresponding to the upper part of the valve cover (2), and a four-open ring (34) is embedded in the annular groove (33). A pressure cover (35) is provided on the inner wall of the valve body (1) at a position corresponding to the upper end of the four-open ring (34), and the pressure cover (35) is locked and connected to the valve cover (2) by bolts (36). The outer periphery of the upper end of the valve cover (2) and the inner side of the valve body (1) form a conical groove (37) with a larger upper part and a smaller lower part. A self-sealing ring (38) is embedded in the conical groove (37), and a second gasket (39) is sandwiched between the self-sealing ring (38) and the four-open ring (34).

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