Seal seat external type welded stop valve and processing technology thereof

Abstract

The application discloses a sealing seat external type welded stop valve and a machining process thereof, which comprises a valve body provided with a water passing channel, the valve body is provided with a flow adjusting mechanism, the valve body is provided with internal threads on both sides, the valve body is internally provided with a sealing seat assembly, the sealing seat assembly comprises a connecting plate, a first sealing plate and a second sealing plate, the first sealing plate, the connecting plate and the second sealing plate are matched to separate the water passing channel to form a water inlet chamber and a water outlet chamber, the connecting plate is provided with a water passing hole, the water inlet chamber is communicated with the water outlet chamber through the water passing hole; the flow adjusting mechanism comprises a valve core structure, the valve core structure is sealingly matched with the water passing hole to adjust the flow passing through the water passing hole, the valve body is provided with a through hole corresponding to the valve core structure, and the valve core structure is movably arranged in the through hole; the valve body is provided with penetrating holes on both sides for mounting the connecting plate, the connecting plate is arranged in the penetrating holes, and the connecting plate is welded and fixed on the valve body at both ends, so that the connecting plate is sealingly matched with the penetrating holes; the first sealing plate and the second sealing plate are sealingly and fixedly welded on both sides of the connecting plate, and the periphery of the first sealing plate and the second sealing plate is sealingly and fixedly welded with the inner wall of the valve body. The machining mode is simple, the machining cost is reduced, and the sealing effect is high.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, and in particular to a gate valve with an externally welded sealing seat and its processing technology. Background Technology

[0002] A Chinese patent with publication number CN 209856405U discloses a gas pipeline connection sealing valve, including a handwheel, a valve stem, a valve body, a valve cover, a connecting plate, and a sealing seat. The handwheel is welded to the top of the valve stem, and the bottom of the valve stem extends into the inner cavity of the valve body and connects with the valve cover. The sealing seat has a two-section structure, with the top of the sealing seat welded to the top of the inner wall of one side of the valve body, and the bottom of the sealing seat welded to the bottom of the inner wall of the other side of the valve body. The connecting plate is welded to the inner wall of the open end of the sealing seat.

[0003] However, the aforementioned sealing valve has the following disadvantages: the connecting plate, sealing seat and valve body of the gate valve are designed as one piece. Although the one-piece design can improve the connection and sealing between the connecting plate and the valve body, the processing of the connecting plate requires specialized equipment, such as large equipment such as stamping machines or cold heading machines commonly used in the market. The processing and assembly costs are high. Therefore, there is an urgent need to develop a gate valve with low processing costs. Summary of the Invention

[0004] The purpose of this invention is to provide a gate valve with an externally welded sealing seat, which has the advantages of simple processing, reduced processing costs, and high sealing performance.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a gate valve with an externally welded sealing seat, comprising a valve body having a water passage, the valve body having a flow regulating mechanism, internal threads on both sides of the valve body, a sealing seat assembly within the valve body, the sealing seat assembly comprising a connecting plate, a first sealing plate, and a second sealing plate, the first sealing plate, the connecting plate, and the second sealing plate cooperating to divide the water passage into an inlet chamber and an outlet chamber, the connecting plate having a water passage hole, the inlet chamber communicating with the outlet chamber through the water passage hole; the flow regulating mechanism comprising a valve core structure, the valve core structure sealingly cooperating with the water passage hole to regulate the flow rate through the water passage hole, the valve body having a through hole corresponding to the valve core structure, the valve core structure being movably disposed within the through hole;

[0006] The valve body has through holes on both sides for mounting the connecting plate. The connecting plate passes through the through holes and is welded and fixed to the valve body at both ends, so that the connecting plate and the through holes are sealed together. The first sealing plate and the second sealing plate are welded and fixed to the two sides of the connecting plate. The first sealing plate and the second sealing plate are offset from each other and are welded and fixed to the inner wall of the valve body around their peripheries.

[0007] By adopting the above technical solution, during production, firstly, through holes and through-holes are made on the valve body corresponding to the connecting plate. Then, the connecting plate is inserted into the through holes, with both ends of the connecting plate inserted into the corresponding through holes. Next, the portion of the connecting plate inserted into the through holes is fixedly connected to the valve body by welding, sealing the gap between the through holes and the connecting plate to prevent oil leakage. Then, the first and second sealing plates are placed into the water passage of the valve body, positioned relatively far apart on both sides of the connecting plate. Finally, the peripheries of the first and second sealing plates are fixedly connected to the corresponding connecting plates and the inner wall of the valve body to achieve a seal. This differs from the traditional method of... The connecting plate and valve body are manufactured as a single unit. Initially, the connecting plate, first sealing plate, second sealing plate, and valve body are designed as separate units. The connecting plate is then inserted into the corresponding through hole on the valve body, and external welding is used to seal and weld the connecting plate to the valve body, thus achieving a fixed connection between the connecting plate and the valve body. Finally, the first sealing plate and second sealing plate are welded to the corresponding sides of the connecting plate and valve body to achieve an overall seal. The entire production process does not require large equipment for stamping or cold heading, making production and processing simpler and more efficient, greatly reducing production and processing costs. Furthermore, the welding and fixing method of the connecting plate to the valve body can effectively improve the sealing performance of the invention. It has the advantages of simple processing method, reduced processing costs, and high sealing performance.

[0008] A further feature of the present invention is that the through holes are symmetrically opened on the side wall of the valve body, the two ends of the connecting plate are inserted into the through holes, and the two ends of the connecting plate are flush with the outer wall of the corresponding valve body. The gap formed between the connecting plate and the through holes is sealed by welding.

[0009] By adopting the above technical solution, the two ends of the connecting plate can be tightly fitted with the through holes on the corresponding sides, and the two ends of the connecting plate are flush with the outer wall of the valve body on the corresponding sides, which can effectively improve the appearance and integrity of the present invention.

[0010] A further feature of the present invention is that the cross-sections of the first sealing plate and the second sealing plate are both semi-circular, the straight edges of the first sealing plate are welded and fixed to the lower surface of one side of the connecting plate, and the straight plates of the second sealing plate are welded and fixed to the upper surface of the other side of the connecting plate.

[0011] A further feature of the present invention is that the water passage hole is located in the middle of the connecting plate.

[0012] By adopting the above technical solution, the water passage hole opened in the middle of the connecting plate makes the structural strength of the connecting plate around the water passage hole more uniform, and prevents the connecting plate from deforming due to water flow impact.

[0013] A further feature of the present invention is that the valve body is provided with a plurality of positioning steps, the side of the first sealing plate and the second sealing plate near the positioning step are positioned with the corresponding stop of the positioning step, and the edge of the first sealing plate and the second sealing plate away from the positioning step is welded and fixed to the inner wall of the valve body.

[0014] By adopting the above technical solution, the installation positions of the first sealing plate and the second sealing plate in the valve body are more accurate, thereby improving the assembly precision of the present invention.

[0015] A further provision of the present invention is that a valve sleeve is welded and fixed around the through hole of the valve body, and the flow regulating mechanism is fixed inside the valve sleeve.

[0016] By adopting the above technical solution, the valve sleeve is fixedly connected to the valve body by welding, which facilitates the installation and fixation of the flow regulating mechanism.

[0017] A further provision of the present invention is that the valve core structure includes a valve stem and a valve disc assembly, and the valve core structure is sealed to the water passage hole through the valve disc assembly.

[0018] By adopting the above technical solution, the valve stem rises and falls, causing the valve disc assembly to move closer to or further away from the water passage, thereby changing the size of the gap between the valve disc assembly and the water passage, and thus adjusting the flow rate through the water passage.

[0019] A further configuration of the present invention is as follows: the valve disc assembly includes a clamping part and a sealing gasket, the clamping part extends radially on the valve stem, and the sealing gasket is coaxially fixed to the end of the valve stem and clamps against the clamping part.

[0020] By adopting the above technical solution, when the valve stem moves down, the sealing gasket is pressed down by the clamping part. When the valve stem moves down to the lowest point, the clamping part presses the sealing gasket tightly onto the connecting plate, thereby sealing the water passage hole.

[0021] A further configuration of the present invention is as follows: the flow regulating mechanism includes a valve seat, an elastic element, and a knob structure. The knob structure is threadedly engaged with the valve seat. The knob structure is provided with a pressure rod. The pressure rod is pressed into the valve core structure. The elastic element is sleeved outside the valve core structure, and the elastic element always has a tendency to drive the valve core structure away from the water passage and to abut against the pressure rod.

[0022] By adopting the above technical solution, the knob structure makes the pressure rod move upward away from the valve core structure. The elastic element uses its own elastic force to push the valve core structure upward, so that the upper end of the valve core structure abuts against the pressure rod. At the same time, it makes the valve core structure move away from the water passage hole, which increases the gap between the water passage hole and the valve core structure, thereby changing the flow rate of the liquid flowing through the water passage hole.

[0023] Another technical objective of this invention is to provide a processing method for a gate valve with an externally welded sealing seat, comprising the following steps:

[0024] S1: Cutting the pipe: The valve body of a predetermined length is obtained by cutting the metal pipe;

[0025] S2: First radial drilling: Drilling a hole along the Z-axis to create a through hole on one side wall of the valve body;

[0026] S3: Second radial drilling: Drilling holes along the Y-axis direction on both sides of the valve body to obtain through holes;

[0027] S4: Assembly: Insert the connecting plate into the through hole along the Y-axis direction, so that the connecting plate passes through the valve body and both ends of the connecting plate are located in the through hole. The two ends of the connecting plate are flush with the outer wall of the valve body. Then, use laser welding to weld and fix the connecting plate to the valve body from the outside, so that the two ends of the connecting plate are sealed with the through hole on the corresponding side.

[0028] S5: Sealing: Place the first sealing plate and the second sealing plate into the valve body along the X-axis to a predetermined position, such that the first sealing plate is located below one side of the connecting plate and the second sealing plate is located above the other side of the connecting plate. Then, use laser welding to weld and fix the first sealing plate and the second sealing plate to the valve body and the connecting plate on the corresponding side to achieve sealing.

[0029] S6: Install the flow regulating mechanism: Align the flow regulating mechanism with the through hole and install it onto the valve body so that the lower end of the valve core structure is aligned with the water passage hole;

[0030] S7: Tapping: Tap the two ends of the valve body to obtain internal threads.

[0031] In summary, the present invention has the following beneficial effects:

[0032] The assembly method involves creating a through hole in the valve body. During assembly, a connecting plate is inserted into the through hole to a predetermined position, aligning both ends of the connecting plate with the outer wall of the valve body. The connecting plate is then welded to the valve body to secure it, sealing the gaps between the two ends of the connecting plate and the corresponding through holes. A first sealing plate and a second sealing plate are then placed relatively far apart within the valve body, positioned on either side of the connecting plate. Finally, the peripheries of the first and second sealing plates are welded to the corresponding connecting plates and the inner wall of the valve body to seal them, thus assembling the sealing seat assembly. The entire production process eliminates the need for large equipment for stamping or cold heading, making production simpler and more efficient, significantly reducing production costs. Furthermore, the welding method of fixing the connecting plate to the valve body effectively improves the sealing performance of this invention, resulting in a simple processing method, reduced processing costs, and high sealing performance. Attached Figure Description

[0033] Figure 1 This is a structural diagram of the present invention.

[0034] Figure 2 This is a side view of the present invention.

[0035] Figure 3 This is the present invention. Figure 2 A sectional view of section AA in the middle.

[0036] Figure 4 This is the front view of the present invention.

[0037] Figure 5 This is the present invention. Figure 4 Sectional view of section BB.

[0038] In the diagram: 1. Valve body; 100. Internal thread; 101. Water passage; 101a. Inlet chamber; 101b. Outlet chamber; 102. Through hole; 103. Through hole; 104. Positioning step; 11. Connecting plate; 11a. Water passage hole; 12. First sealing plate; 13. Second sealing plate; 14. Valve sleeve; 2. Flow regulating mechanism; 21. Valve core structure; 211. Valve stem; 212. Valve disc assembly; 2121. Pressing part; 2122. Sealing gasket; 22. Valve seat; 23. Elastic element; 24. Knob structure; 241. First-stage adjustment knob; 242. Second-stage adjustment knob; 243. Pressure rod; 25. First clamp; 26. Second clamp; 27. Baffle. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] A type of gate valve with an externally welded sealing seat, such as Figure 1-3As shown, the valve body 1 includes a water passage 101, a flow regulating mechanism 2, internal threads 100 on both sides, and a sealing seat assembly inside the valve body 1. The sealing seat assembly includes a connecting plate 11, a first sealing plate 12, and a second sealing plate 13. The first sealing plate 12, the connecting plate 11, and the second sealing plate 13 cooperate to divide the water passage 101 into an inlet chamber 101a and an outlet chamber 101b. The connecting plate 11 has a water passage hole 11a, through which the inlet chamber 101a communicates with the outlet chamber 101b. The flow regulating mechanism 2 includes a valve core structure 21, which seals with the water passage hole 11a to regulate the flow rate through the water passage hole 11a. The valve body 1 has a through hole 103 corresponding to the valve core structure 21, and the valve core structure 21 is movably disposed within the through hole 103. The valve body 1 has through holes 102 on both sides for mounting the connecting plate 11, through which the connecting plate 11 passes. Within 102, the connecting plate 11 is welded and fixed to the valve body 1 at both ends, so that the connecting plate 11 and the through hole 102 are sealed together; the first sealing plate 12 and the second sealing plate 13 are welded and fixed to both sides of the connecting plate 11, and the first sealing plate 12 and the second sealing plate 13 are staggered relative to each other, and the periphery of the first sealing plate 12 and the second sealing plate 13 are welded and fixed to the inner wall of the valve body 1 to achieve sealing. The production and processing method is simple and can effectively reduce the production and processing cost; the through hole 102 is symmetrically opened on the side wall of the valve body 1, and the two ends of the connecting plate 11 are inserted into the through hole 102, and the two ends of the connecting plate 11 are flush with the outer wall of the corresponding valve body 1. The gap formed between the connecting plate 11 and the through hole 102 is sealed by welding, so that the two ends of the connecting plate 11 can fit tightly with the through hole 102 on the corresponding side. At the same time, the way in which the two ends of the connecting plate 11 are flush with the outer wall of the corresponding valve body 1 can effectively improve the appearance and integrity of the present invention.

[0041] like Figure 2-5As shown, the valve core structure 21 includes a valve stem 211 and a valve disc assembly 212. The valve core structure 21 is sealed with the water passage hole 11a through the valve disc assembly 212. The valve stem 211 moves up and down, causing the valve disc assembly 212 to move closer to or further away from the water passage hole 11a, thereby changing the size of the gap between the valve disc assembly 212 and the water passage hole 11a, and thus regulating the flow rate through the water passage hole 11a. The valve disc assembly 212 includes a pressing part 2121 and a sealing gasket 2122. The pressing part 2121 extends radially on the valve stem 211, and the sealing gasket 2122 is coaxially fixed to the end of the valve stem 211 and presses against the pressing part 2121. When the valve stem 211 moves down, the pressing part 2121 presses the sealing gasket 2122 downward. When 11 moves down to the lowest point, the pressing part 2121 presses the sealing gasket 2122 tightly onto the connecting plate 11, thereby sealing the water passage hole 11a. The cross-sections of the first sealing plate 12 and the second sealing plate 13 are both designed as semi-circular structures. The straight edges of the first sealing plate 12 are welded and fixed to the lower surface of one side of the connecting plate 11, and the straight plates of the second sealing plate 13 are welded and fixed to the upper surface of the other side of the connecting plate 11. The water passage hole 11a is opened in the middle of the connecting plate 11. The water passage hole 11a opened in the middle of the connecting plate 11 makes the structural strength of the connecting plate 11 around the water passage hole 11a more uniform, preventing the connecting plate 11 from deforming due to water flow impact. The valve body 1 is provided with two A positioning step 104 is provided. The first sealing plate 12 and the second sealing plate 13 are positioned with the corresponding positioning step 104 on the side near the positioning step 104. The edge of the first sealing plate 12 and the second sealing plate 13 away from the positioning step 104 is welded and fixed to the inner wall of the valve body 1, so that the installation position of the first sealing plate 12 and the second sealing plate 13 in the valve body 1 is more accurate, improving the assembly accuracy of the present invention. A valve sleeve 14 is welded and fixed around the through hole 103 in the valve body 1. The flow regulating mechanism 2 is fixed in the valve sleeve 14. The valve sleeve 14 is fixedly connected to the valve body 1 by welding, which facilitates the installation and fixing of the flow regulating mechanism 2. In addition, the flow regulating mechanism 2 includes a valve seat 22, an elastic element 23 and a knob structure 2. 4. The knob structure 24 is threadedly engaged with the valve seat 22. The knob structure 24 is provided with a pressure rod 243. The pressure rod 243 is pressed into the valve core structure 21. The elastic element 23 is sleeved on the outside of the valve core structure 21. The elastic element 23 always has a tendency to drive the valve core structure 21 away from the water passage hole 11a and to abut against the pressure rod 243. Twisting the knob structure 24 causes the pressure rod 243 to move upward away from the valve core structure 21. The elastic element 23 uses its own elastic force to push the valve core structure 21 upward, so that the upper end of the valve core structure 21 abuts against the pressure rod 243. At the same time, it causes the valve core structure 21 to move away from the water passage hole 11a, so that the gap between the water passage hole 11a and the valve core structure 21 becomes larger, thereby changing the flow rate of the liquid flowing through the water passage hole 11a.The knob structure 24 in this embodiment includes a primary adjustment knob 241 and a secondary adjustment knob 242. A baffle is fixedly provided at the bottom of the valve seat 22, and a first clamp 25 is fixedly provided on the valve stem 211. One end of the elastic element 23 abuts against the baffle, and the other end of the elastic element 23 abuts against the first clamp 25. In addition, a pressure rod 243 is integrally provided on the adjustment knob, and a second clamp 26 is sleeved and fixed on the pressure rod 243. The pressure rod 243 is anti-disengaged with the secondary adjustment knob through the second clamp 26.

[0042] The basic working principle of this invention is as follows: During production, a through hole 102 is first opened on the valve body 1 corresponding to the connecting plate 11. Then, the connecting plate 11 is inserted into the through hole 102 to a predetermined position, so that the two ends of the connecting plate 11 are aligned with the outer wall of the valve body 1. Then, the connecting plate 11 and the valve body 1 are welded and fixed together by welding, and the gap between the two ends of the connecting plate 11 and the corresponding side through hole 102 is sealed. Then, the first sealing plate 12 and the second sealing plate 13 are placed in the valve body 1 in a relatively far apart manner and are respectively located on both sides of the connecting plate 11. Then, the periphery of the first sealing plate 12 and the second sealing plate 13 are welded and sealed to the corresponding side connecting plate 11 and the inner wall of the valve body 1 by welding again, so as to realize the assembly of the sealing seat assembly. The entire production process does not require large equipment for stamping or cold heading, making the production and processing simpler and more efficient, greatly reducing the production and processing cost. Moreover, the welding and fixing of the connecting plate 11 and the valve body 1 can also effectively improve the sealing performance of this invention. It has the effects of simple processing method, reduced processing cost, and high sealing performance.

[0043] Another technical objective of this invention is to provide a processing method for a gate valve with an externally welded sealing seat, comprising the following steps:

[0044] S1: Cutting the pipe: The valve body of a predetermined length is obtained by cutting the metal pipe;

[0045] S2: First radial drilling: Drilling a hole along the Z-axis to create a through hole on one side wall of the valve body;

[0046] S3: Second radial drilling: Drilling holes along the Y-axis direction on both sides of the valve body to obtain through holes;

[0047] S4: Assembly: Insert the connecting plate into the through hole along the Y-axis direction, so that the connecting plate passes through the valve body and both ends of the connecting plate are located in the through hole. The two ends of the connecting plate are flush with the outer wall of the valve body. Then, use laser welding to weld and fix the connecting plate to the valve body from the outside, so that the two ends of the connecting plate are sealed with the through hole on the corresponding side.

[0048] S5: Sealing: Place the first sealing plate and the second sealing plate into the valve body along the X-axis to a predetermined position, such that the first sealing plate is located below one side of the connecting plate and the second sealing plate is located above the other side of the connecting plate. Then, use laser welding to weld and fix the first sealing plate and the second sealing plate to the valve body and the connecting plate on the corresponding side to achieve sealing.

[0049] S6: Install the flow regulating mechanism: Align the flow regulating mechanism with the through hole and install it onto the valve body so that the lower end of the valve core structure is aligned with the water passage hole;

[0050] S7: Tapping: Tap the two ends of the valve body to obtain internal threads.

[0051] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A gate valve with an externally welded sealing seat, comprising a valve body (1) having a water passage (101), wherein the valve body (1) is provided with a flow regulating mechanism (2), characterized in that: The valve body (1) has internal threads (100) on both sides. A sealing seat assembly is provided inside the valve body (1). The sealing seat assembly includes a connecting plate (11), a first sealing plate (12), and a second sealing plate (13). The first sealing plate (12), the connecting plate (11), and the second sealing plate (13) cooperate to divide the water passage (101) into an inlet chamber (101a) and an outlet chamber (101b). The connecting plate (11) has a water passage hole (11a). The inlet chamber (101a) is connected to the outlet chamber (101b) through the water passage (11a); the flow regulating mechanism (2) includes a valve core structure (21), which is sealed to the water passage (11a) to regulate the flow rate through the water passage (11a); the valve body (1) has a through hole (103) corresponding to the valve core structure (21), and the valve core structure (21) is movably disposed in the through hole (103); The valve body (1) has through holes (102) on both sides for mounting the connecting plate (11). The connecting plate (11) passes through the through holes (102) and the two ends of the connecting plate (11) are welded and fixed to the valve body (1) so that the connecting plate (11) and the through holes (102) are sealed together. The first sealing plate (12) and the second sealing plate (13) are welded and fixed to the two sides of the connecting plate (11). The first sealing plate (12) and the second sealing plate (13) are offset relative to each other, and the periphery of the first sealing plate (12) and the second sealing plate (13) are welded and fixed to the inner wall of the valve body (1).

2. The gate valve with externally welded sealing seat according to claim 1, characterized in that: The through holes (102) are symmetrically opened on the side wall of the valve body (1). The two ends of the connecting plate (11) are inserted into the through holes (102), and the two ends of the connecting plate (11) are flush with the outer wall of the corresponding valve body (1). The gap formed between the connecting plate (11) and the through holes (102) is sealed by welding.

3. The gate valve with externally welded sealing seat according to claim 1, characterized in that: The first sealing plate (12) and the second sealing plate (13) are both designed with a semi-circular cross-section. The straight edge of the first sealing plate (12) is welded and fixed to the lower surface of one side of the connecting plate (11), and the straight plate of the second sealing plate (13) is welded and fixed to the upper surface of the other side of the connecting plate (11).

4. The gate valve with externally welded sealing seat according to claim 1, characterized in that: The water passage (11a) is located in the middle of the connecting plate (11).

5. A gate valve with an externally welded sealing seat according to claim 1, characterized in that: The valve body (1) is provided with a plurality of positioning steps (104). The first sealing plate (12) and the second sealing plate (13) are positioned by stopping the corresponding positioning step (104) on the side close to the positioning step (104). The edge of the first sealing plate (12) and the second sealing plate (13) away from the positioning step (104) is welded and fixed to the inner wall of the valve body (1).

6. The gate valve with externally welded sealing seat according to claim 1, characterized in that: The valve body (1) has a valve sleeve (14) welded and fixed around the through hole (103), and the flow regulating mechanism (2) is fixed inside the valve sleeve (14).

7. A gate valve with an externally welded sealing seat according to claim 1, characterized in that: The valve core structure (21) includes a valve stem (211) and a valve disc assembly (212), and the valve core structure (21) is sealed to the water passage hole (11a) through the valve disc assembly (212).

8. The gate valve with externally welded sealing seat according to claim 7, characterized in that: The valve disc assembly (212) includes a pressing part (2121) and a sealing gasket (2122). The pressing part (2121) extends radially on the valve stem (211), and the sealing gasket (2122) is coaxially fixed to the end of the valve stem (211) and presses against the pressing part (2121).

9. A gate valve with an externally welded sealing seat according to claim 1, characterized in that: The flow regulating mechanism (2) includes a valve seat (22), an elastic element (23), and a knob structure (24). The knob structure (24) is threadedly engaged with the valve seat (22). The knob structure (24) is provided with a pressure rod (243). The pressure rod (243) is pressed into the valve core structure (21). The elastic element (23) is sleeved outside the valve core structure (21), and the elastic element (23) always has a tendency to drive the valve core structure (21) away from the water passage hole (11a) and to resist the pressure rod (243).

10. A processing method for a gate valve with an externally welded sealing seat as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Cutting the pipe: The valve body of a predetermined length is obtained by cutting the metal pipe; S2: First radial drilling: Drilling a hole along the Z-axis to create a through hole on one side wall of the valve body; S3: Second radial drilling: Drilling holes along the Y-axis direction on both sides of the valve body to obtain through holes; S4: Assembly: Insert the connecting plate into the through hole along the Y-axis direction, so that the connecting plate passes through the valve body and both ends of the connecting plate are located in the through hole. The two ends of the connecting plate are flush with the outer wall of the valve body. Then, use laser welding to weld and fix the connecting plate to the valve body from the outside, so that the two ends of the connecting plate are sealed with the through hole on the corresponding side. S5: Sealing: Place the first sealing plate and the second sealing plate into the valve body along the X-axis to a predetermined position, such that the first sealing plate is located below one side of the connecting plate and the second sealing plate is located above the other side of the connecting plate. Then, use laser welding to weld and fix the first sealing plate and the second sealing plate to the valve body and the connecting plate on the corresponding side to achieve sealing. S6: Install the flow regulating mechanism: Align the flow regulating mechanism with the through hole and install it onto the valve body so that the lower end of the valve core structure is aligned with the water passage hole; S7: Tapping: Tap the two ends of the valve body to obtain internal threads.

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