Bellows seal gate valve

Abstract

This utility model discloses a bellows-sealed gate valve, including a valve body, a valve cover, a valve seat, a valve stem, a gate, a bellows, and a transmission mechanism. The lower end face of the valve cover is fixedly and sealed to the upper end face of the valve body cavity. The upper end of the valve cover is sealed to the lower end of the support. The upper end of the gate is connected to the lower end of the valve stem. The upper end of the valve stem is connected to the transmission mechanism. Packing is provided between the valve stem and the support. A pressure cap is installed on the top of the support. An adjusting screw is provided on the top of the support. The pressure cap and the adjusting screw are slidably connected. A clamping nut is fitted on the adjusting screw. A sealing sheet is press-fitted between the upper end face of the valve cover and the lower end face of the support. A fixing plate is provided on the upper end of the gate. The bellows is formed by welding multiple segments together. The top of the bellows is connected to the sealing sheet, and the bottom is connected to the fixing plate. A piercing assembly is provided on the support. The piercing assembly includes a screw hole on the support and a rotating screw inserted into the screw hole. A conical head is provided at the bottom of the rotating screw.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a bellows-sealed gate valve. Background Technology

[0002] Bellows gate valves are commonly used in chemical, petroleum, and pharmaceutical industries to control flammable, explosive, harmful, and toxic fluid media. The bellows gate valve consists of a valve body, valve cover, valve seat, valve stem, gate, and transmission mechanism. The gate has sealing surfaces on both sides that mate with the valve seat, and its upper end connects to the lower end of the valve stem. The upper end of the valve stem passes through the valve cover and connects to the transmission mechanism on the support. A packing seal is installed between the valve stem and the valve cover. However, some gate valves have long strokes, resulting in large elastic deformation of the bellows. Often, the pressure resistance and fatigue strength of the bellows cannot meet requirements, and the bellows may lose its expansion and contraction properties or even wear and break during use, causing problems such as obstructed valve opening and closing and leakage in the cavity seal. Furthermore, due to the long valve stroke and frequent valve stem movement, the packing is also prone to wear and needs replacement. However, existing gate valve structures are relatively complex, and replacing the packing requires removing the gland and then using external tools to remove the packing, which is cumbersome and inconvenient. Summary of the Invention

[0003] The purpose of this utility model is to provide a bellows-sealed gate valve to solve the problems mentioned in the background art.

[0004] To solve the above technical problems, this utility model adopts the following technical solution: a bellows-sealed gate valve, comprising a valve body, a valve cover, a valve seat, a valve stem, a gate, a bellows, and a transmission mechanism. The lower end face of the valve cover is fixedly and sealed to the upper end face of the valve body cavity. The upper end of the valve cover is sealed to the lower end of a bracket. The gate has sealing surfaces on both sides that cooperate with the valve seat, and its upper end is connected to the lower end of the valve stem. The upper end of the valve stem passes through the valve cover and is connected to the transmission mechanism on the bracket. Packing is provided between the valve stem and the bracket. A pressure cap is installed on the top of the bracket. The valve cover is provided with an adjusting screw, and the pressure cap is provided with a through hole and slidably connected to the adjusting screw. A clamping nut is fitted on the adjusting screw. A sealing sheet is press-fitted between the upper end face of the valve cover and the lower end face of the bracket. A fixing plate is provided at the upper end of the gate. The valve cover is also provided with a bellows which is formed by welding multiple segments together. The top of the bellows is connected to the sealing sheet and the bottom is connected to the fixing plate. A piercing assembly is provided on the bracket. The piercing assembly includes a screw hole on the bracket and a rotating screw inserted into the screw hole. The bottom of the rotating screw is provided with a conical head.

[0005] By adopting the above technical solutions and setting a sealing plate, the sealing performance of the upper end of the valve body is improved. The bellows is set into multiple segments, and the deformation of each segment is controllable, which allows the bellows to achieve a large amount of elastic deformation and strong resistance to external forces, meeting the requirements of long stroke. When it is necessary to replace the packing, the adjusting screw is moved down so that the conical head can penetrate into the packing. Then, the adjusting nut is turned up to release the pressure on the gland. The gland is then moved up, and the conical head can move the packing up at the same time. Then, the adjusting screw is moved up to remove the packing directly without disassembling the gland, making the operation convenient and quick.

[0006] As a further optimization of this utility model, connecting rings are provided on the inner sides of both sides of the segmented part, and every two adjacent segments are connected by the connecting rings. The inner diameter of the connecting rings is larger than the outer diameter of the valve stem.

[0007] By adopting the above technical solutions, the connecting ring not only increases the connection strength between the segmented pipes, but also makes the manufacturing process of the bellows simpler. The connecting ring is sleeved on the outside of the valve stem, which can ensure that it moves along the axial direction without deviation, thus protecting the bellows and reducing the wear of the packing.

[0008] As a further optimization of this utility model, a support nut is also sleeved on the adjusting screw, and the support nut is located between the bracket and the pressure cap.

[0009] Using the above technical solution, when the gland moves upward, the rotating support nut moves upward to support the bottom of the gland, preventing it from sliding down and making it easier to remove the packing.

[0010] As a further optimization of this utility model, at least two puncture components are provided along the circumferential direction.

[0011] Using the above technical solution, at least two puncture components should be set up to simultaneously puncture both sides of the filler.

[0012] As a further optimization of this utility model, a knob is provided on the top of the rotating screw, and the surface of the knob is provided with anti-slip texture.

[0013] By adopting the above technical solution, the knob can be easily turned to rotate the screw.

[0014] The beneficial effects of this utility model are as follows: the sealing sheet improves the sealing performance of the upper part of the valve body; the bellows is divided into multiple sections, and the deformation of each section is controllable, which allows the bellows to achieve a large elastic deformation and strong resistance to external forces, meeting the requirements of a long stroke; when the packing needs to be replaced, the adjusting screw is moved down so that the conical head can penetrate into the packing, then the adjusting nut is turned up to release the pressure on the gland, and then the gland is moved up, at the same time the conical head can drive the packing up, and then the adjusting screw is moved up to remove the packing directly without disassembling the gland, making the operation convenient and quick. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 The enlarged illustration below;

[0017] Figure 3 for Figure 1 The enlarged diagram above.

[0018] The labels in the diagram mean the following: 1. Valve body; 11. Bellows; 12. Valve seat; 13. Valve stem; 14. Gate; 15. Bracket; 16. Packing; 17. Gland; 18. Adjusting screw; 19. Compression nut; 2. Sealing plate; 3. Fixing plate; 4. Segment; 41. Connecting ring; 51. Screw hole; 52. Rotating screw; 53. Knob; 6. Support nut. Detailed Implementation

[0019] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0020] See appendix Figure 1-3 The present embodiment of this utility model further includes: a bellows 11 sealing gate valve, comprising a valve body 1, a valve cover, a valve seat 12, a valve stem 13, a gate 14, a bellows 11, and a transmission mechanism. The lower end face of the valve cover is fixedly and sealed to the upper end face of the cavity of the valve body 1. The upper end of the valve cover is sealed to the lower end of the bracket 15. The gate 14 has sealing surfaces on both sides that cooperate with the valve seat 12 and its upper end is connected to the lower end of the valve stem 13. The upper end of the valve stem 13 passes through the valve cover and is connected to the transmission mechanism on the bracket 15. A packing 16 is provided between the valve stem 13 and the bracket 15. A pressure cap 17 is installed above the bracket 15. An adjusting screw 18 is provided above the bracket 15. The pressure cap 17 has a through hole and is slidably connected to the adjusting screw 18. A clamping nut 19 is sleeved on the adjusting screw 18.

[0021] A sealing sheet 2 is press-fitted between the upper end face of the valve cover and the lower end face of the bracket 15. A fixing plate 3 is provided at the upper end of the gate 14. The bellows 11 is formed by welding multiple segmented parts 4 together. The top of the bellows 11 is connected to the sealing sheet 2 and the bottom is connected to the fixing plate 3. Furthermore, a connecting ring 41 is provided on the inner side of both sides of the segmented parts 4. Every two adjacent segmented parts 4 are connected by the connecting ring 41. The inner diameter of the connecting ring 41 is larger than the outer diameter of the valve stem 13.

[0022] The support 15 is provided with a piercing assembly. There are at least two piercing assemblies along the circumference. At least two piercing assemblies can simultaneously pierce both sides of the filler 16. The piercing assembly includes a screw hole 51 on the support 15 and a rotating screw 52 inserted into the screw hole 51. The bottom of the rotating screw 52 is provided with a tapered head. Furthermore, a support nut 6 is also fitted on the adjusting screw 18. The support nut 6 is located between the support 15 and the pressure cap 17. The top of the rotating screw 52 is provided with a knob 53. The surface of the knob 53 is provided with anti-slip texture.

[0023] The principle of this utility model is as follows: the sealing sheet 2 is set to improve the sealing performance of the upper end of the valve body 1. The bellows 11 is set with multiple segments 4, and the deformation of each segment 4 is controllable, so that the bellows 11 can achieve a large elastic deformation and has a strong resistance to external forces, which meets the requirements of a long stroke. The connecting ring 41 not only increases the connection strength between the segments, but also makes the manufacturing process of the bellows 11 simpler. The connecting ring 41 is sleeved on the outside of the valve stem 13, which can ensure that it moves along the axial direction without deviation, and can protect the bellows 11 and reduce the wear of the packing 16.

[0024] When it is necessary to replace the packing 16, adjust the rotating screw 52 downward by turning the knob 53 so that the conical head can penetrate into the packing 16. Then, turn the adjusting nut upward to release the downward pressure on the gland 17, and then move the gland 17 upward. Rotate the support nut 6 upward to support the lower part of the gland 17 to prevent it from sliding down. At the same time, the conical head can drive the packing 16 upward. Then, rotate the support nut 6 upward to support the lower part of the gland 17 to prevent it from sliding down. Finally, adjust the rotating screw 52 upward by turning the knob 53 to remove the packing 16 directly without disassembling the gland 17. The operation is convenient and quick.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A bellows (11) sealed gate valve, comprising a valve body (1), a valve cover, a valve seat (12), a valve stem (13), a gate (14), a bellows (11), and a transmission mechanism, wherein the lower end face of the valve cover is fixedly and sealed to the upper end face of the cavity of the valve body (1), the upper end of the valve cover is sealed to the lower end of a bracket (15), the gate (14) has sealing surfaces on both sides that cooperate with the valve seat (12) and its upper end is connected to the lower end of the valve stem (13), the upper end of the valve stem (13) passes through the valve cover and is connected to the transmission mechanism on the bracket (15), a packing (16) is provided between the valve stem (13) and the bracket (15), a pressure cap (17) is installed above the bracket (15), an adjusting screw (18) is provided above the bracket (15), the pressure cap (17) has a through hole and is slidably connected to the adjusting screw (18), and a clamping nut (19) is sleeved on the adjusting screw (18), characterized in that, A sealing sheet (2) is press-fitted between the upper end face of the valve cover and the lower end face of the bracket (15). A fixing plate (3) is provided at the upper end of the gate (14). The bellows (11) is formed by welding multiple segmented parts (4) together. The top of the bellows (11) is connected to the sealing sheet (2) and the bottom is connected to the fixing plate (3). A piercing assembly is provided on the bracket (15). The piercing assembly includes a screw hole (51) on the bracket (15) and a rotating screw (52) inserted into the screw hole (51). The bottom of the rotating screw (52) is provided with a conical head.

2. The bellows (11) sealing gate valve according to claim 1, characterized in that, The inner sides of the segment (4) are provided with connecting rings (41), and every two adjacent segments (4) are connected by connecting rings (41). The inner diameter of the connecting ring (41) is larger than the outer diameter of the valve stem (13).

3. A bellows (11) sealed gate valve according to claim 1, characterized in that, The adjusting screw (18) is also fitted with a support nut (6), which is located between the bracket (15) and the pressure cap (17).

4. A bellows (11) sealed gate valve according to claim 1, characterized in that, The puncture assembly has at least two components along the circumferential direction.

5. A bellows (11) sealed gate valve according to claim 1, characterized in that, The top of the rotating screw (52) is provided with a knob (53), and the surface of the knob (53) is provided with anti-slip texture.

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