Wedge double-disc gate valve applicable to both horizontal and vertical pipes, and assembly method
Patent Information
- Application Number
- PCT/CN2025/145877
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-20
- Filing Date
- 2025-12-26
- Publication Date
- 2026-08-27
Smart Images
Figure CN2025145877_27082026_PF_FP_ABST
Abstract
Description
A wedge-type double gate valve suitable for both horizontal and vertical pipelines and its assembly method Technical Field
[0001] This invention belongs to the field of valve technology, and particularly relates to a wedge-type double gate valve and its assembly method applicable to both horizontal and vertical pipelines. Background Technology
[0002] Gate valves achieve sealing through the contact between the valve seat and the valve disc sealing surfaces. The opening and closing direction of the valve disc is perpendicular to the direction of medium flow. Gate valves can only be fully open or fully closed and cannot be used as control valves. Commonly used gate valves have two sealing surfaces forming a wedge shape, with a wedge angle typically of 5°. When a gate valve is closed, it relies on the force of the medium to achieve a seal, that is, the medium force pushes the sealing surface of the valve disc closer to the sealing surface of the valve seat on the outlet side.
[0003] The wedge-type double gate valve consists of two valve discs with a universal joint and a spacer between them. These two discs can freely rotate around the spherical surface of the universal joint to compensate for errors in the machining of the sealing surface angle, ensuring a tight seal. The wedge-type double gate valve is recommended for installation on horizontal pipelines. If installed on a vertical pipeline, the guide rib of the lower valve disc mates with the guide groove of the valve body, keeping the lower valve disc horizontal. The upper valve disc, due to its wedge structure, has its center of gravity located to the right of the centerline. Opening the valve causes the upper valve disc to rotate clockwise. The left side of the sealing surface of the upper valve disc rises upwards, while the right side falls downwards. When closing the valve, the left side of the sealing surface of the upper valve disc can easily hit the valve seat, damaging the sealing surface and causing valve seal failure. Technical issues
[0004] The purpose of this invention is to provide a wedge-type double-gate valve and its assembly method suitable for both horizontal and vertical pipelines, to solve the problem that when existing wedge-type double-gate valves are used in vertical pipelines, the center of gravity of the upper valve disc shifts off the center line, causing the upper valve disc to rotate after opening the valve, resulting in it hitting the valve seat when closing the valve. The technical solution adopted by this invention is as follows: Technical solutions
[0005] A wedge-type double gate valve suitable for both horizontal and vertical pipelines includes a valve body, which is a three-way component. When the valve is used in a vertical pipeline, the medium inlet and medium outlet of the valve body are coaxially arranged to form a vertical medium flow channel. The side opening of the valve body is set to the right, and the valve cover closes the side opening of the valve body. Valve seats are provided on the through diameters of the medium inlet and the medium outlet. The opposite end face of the two valve seats is a first oblique sealing surface that gradually converges from right to left.
[0006] The valve assembly includes an upper valve and a lower valve. The upper valve includes a cylindrical body structure and a connecting flange located at the lower part of the body structure. The connecting flange is offset to the right side of the body structure. A cylindrical groove and two sets of spring grooves are provided on the lower end face of the upper valve. The axis of the cylindrical groove coincides with the axis of the body structure, and the axis of the spring groove is located to the right of the axis of the body structure. The position of the center of gravity of the upper valve is determined by the three-dimensional modeling of the upper valve. The two sets of spring grooves are symmetrically arranged on the front and rear sides of the center of gravity of the upper valve.
[0007] The upper valve disc and the lower valve disc have the same structure and are symmetrical. After the connecting flanges of the upper valve disc and the lower valve disc are combined, guide ridges are formed on the front and rear sides of the valve disc assembly, and a T-shaped groove is formed on the right side of the valve disc assembly. The end face of the upper valve disc body structure and the lower valve disc body structure that are opposite to each other is a second oblique sealing surface that gradually converges from right to left.
[0008] A pad is provided in the cylindrical groove of the upper valve disc, and a universal top is provided in the cylindrical groove of the lower valve disc. A spherical groove is provided on the lower end face of the pad, and the upper end of the universal top is a convex spherical column head structure. The convex spherical column head structure is tangentially fitted with the spherical groove. A gap is provided between the upper valve disc and the lower valve disc. The upper ends of several compression springs are respectively abutted against the bottom surfaces of several spring grooves of the upper valve disc, and the lower ends of several compression springs are respectively abutted against the bottom surfaces of several spring grooves of the lower valve disc. The elastic force of several compression springs is set according to the weight of the upper valve disc, so that when the upper end face of the lower valve disc is horizontal, the lower end face of the upper valve disc also remains horizontal.
[0009] The valve body has guide grooves on its front and rear inner walls, which are arranged left and right. Two guide protrusions slide in a one-to-one correspondence with the two guide grooves. The left end of the valve stem has a T-shaped connection structure that passes through the valve cover. The T-shaped connection structure of the valve stem is adapted to the T-shaped groove. When the valve stem drives the valve disc assembly to slide left and right, the two second oblique sealing surfaces and the two first oblique sealing surfaces abut against each other to seal or separate.
[0010] Furthermore, it also includes adjustable shims, of which there are several, and the thickness of the adjustable shims varies sequentially. Any one of the adjustable shims is set in the spring groove of the lower valve disc, and the lower end of the compression spring abuts against the bottom surface of the corresponding spring groove on the lower valve disc through the adjustable shim.
[0011] Furthermore, the valve cover and valve body are connected by a four-way ring and sealed by a sealing ring.
[0012] Furthermore, the valve cover and valve stem are slidably sealed by a packing assembly.
[0013] Furthermore, each set of spring slots has one or two slots.
[0014] Furthermore, a bracket is provided at the right end of the valve body, and a bearing seat is provided at the right end of the bracket. The lifting screw sleeve is rotatably mounted in the bearing seat through a thrust bearing. The actuator is connected to the right end of the bearing seat, and the output end of the actuator is connected to the right end of the lifting screw sleeve. The inner circumference of the lifting screw sleeve is threadedly engaged with the outer circumference of the valve stem. One end of the guide rod is sleeved on the valve stem. The bracket is provided with a guide elongated hole, which is set along the axial direction of the valve stem. The other end of the guide rod is slidably engaged with the guide elongated hole.
[0015] This invention also provides a method for assembling a wedge-type double gate valve, based on the aforementioned wedge-type double gate valve suitable for both horizontal and vertical pipelines, comprising the following steps:
[0016] Step 1: Make a slant plate fixture. The lower end face of the slant plate fixture is a horizontal plane, and the upper end face of the slant plate fixture has the same slope as the first slant sealing surface of the valve seat located at the lower end.
[0017] Step 2: Place the lower valve disc on the slant plate fixture so that the upper end face of the lower valve disc is horizontal;
[0018] Step 3: Install the universal joint into the cylindrical groove of the lower valve disc and the pad into the cylindrical groove of the upper valve disc, so that the convex spherical head structure of the universal joint is tangentially fitted with the spherical groove of the pad. Fit the two ends of several compression springs with the two sets of spring grooves of the lower valve disc and the two sets of spring grooves of the upper valve disc respectively. Check the levelness of the lower end face of the upper valve disc. By adding or removing adjustable shims between the spring groove of the lower valve disc and the compression spring, the lower end face of the upper valve disc is made to be in a horizontal state.
[0019] Step 4: Clamp the connecting flanges of the upper and lower valve discs together using G-clamps to maintain the relative position and angle of the upper and lower valve discs;
[0020] Step 5: Insert the guide protrusions formed on the front and rear sides of the valve disc assembly into the two guide grooves of the valve body one by one, remove the G-clamp, connect the T-shaped connection structure of the valve stem to the T-shaped groove, and assemble all other components of the gate valve. Beneficial effects
[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0022] Because the two sets of compression springs act on the center of gravity of the upper valve disc, and the lower end face of the upper valve disc is kept horizontal after the valve disc assembly is installed in the valve body, the force state of the upper valve disc is not changed when the valve is open, and the lower end face can still be kept horizontal. That is, it can ensure that the second oblique sealing surface of the upper valve disc is consistent with the first oblique sealing surface of the valve seat in the medium inlet. When the valve disc assembly is driven to slide left and right along the guide groove by the valve stem, the valve disc assembly can close or open the medium flow channel, avoiding the upper valve disc from rotating and causing damage to the valve seat sealing oblique surface. Attached Figure Description
[0023] Figure 1 is a schematic diagram of the gate valve of the present invention;
[0024] Figure 2 is an enlarged view of point A in Figure 1;
[0025] Figure 3 is a schematic diagram showing the rotation of the upper valve disc when an existing wedge-type double gate valve is opened in a vertical pipeline;
[0026] Figure 4 is an enlarged view of section B in Figure 3;
[0027] Figure 5 is a top view of the valve disc assembly;
[0028] Figure 6 is a cross-sectional view of the upper valve disc;
[0029] Figure 7. Cross-sectional view of the valve body;
[0030] Figure 8 is a schematic diagram of the valve disc assembly of the present invention being assembled on a swashplate fixture.
[0031] In the diagram, 1. Valve body, 2. Valve seat, 3. Lower valve disc, 4. Universal joint, 5. Pad, 6. Upper valve disc, 7. Valve cover, 8. Valve stem, 9. Lifting screw sleeve, 10. Bearing housing, 11. Actuator, 12. Guide rod, 13. Connecting flange, 14. Adjustable shim, 15. Swashplate fixture, 16. Compression spring, 17. Body structure, 18. Cylindrical groove, 19. Spring groove, 20. Guide protrusion, 21. T-slot, 22. Guide groove, 23. Medium inlet, 24. Medium outlet. Embodiments of the present invention
[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.
[0033] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.
[0034] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.
[0035] Example 1: As shown in Figures 1 to 7, a wedge-type double gate valve suitable for both horizontal and vertical pipelines includes a valve body 1, which is a three-way component. When the gate valve is used for a vertical pipeline, the medium inlet 23 and the medium outlet 24 of the valve body 1 are coaxially arranged vertically to form a vertical medium flow channel. The side opening of the valve body 1 is set to the right, and the valve cover 7 closes the side opening of the valve body 1. A valve seat 2 is provided on the through diameter of both the medium inlet 23 and the medium outlet 24. The opposite end face of the two valve seats 2 is a first oblique sealing surface that gradually converges from right to left. The two valve seats 2 are symmetrical vertically.
[0036] The valve assembly includes an upper valve disc 6 and a lower valve disc 3. The upper valve disc 6 includes a cylindrical body structure 17 and a connecting flange 13 located at the lower part of the body structure 17. The connecting flange 13 is offset to the right side of the body structure 17. A cylindrical groove 18 and two sets of spring grooves 19 are provided on the lower end surface of the upper valve disc 6. The axis of the cylindrical groove 18 coincides with the axis of the body structure 17. The axis of the spring groove 19 is located to the right of the axis of the body structure 17. The center of gravity of the upper valve disc 6 is determined by the three-dimensional modeling of the upper valve disc 6. The two sets of spring grooves 19 are symmetrically arranged on the front and rear sides of the center of gravity of the upper valve disc 6 to ensure that the spring force of the compression spring 16 acts on the center of gravity of the upper valve disc 6 and is applied symmetrically to ensure that the upper valve disc 6 is subjected to uniform force.
[0037] The upper valve disc 6 and the lower valve disc 3 have the same structure and are symmetrical. After the connecting flange 13 of the upper valve disc 6 and the lower valve disc 3 are combined, guide ridges 20 are formed on the front and rear sides of the valve disc assembly, and a T-shaped groove 21 is formed on the right side of the valve disc assembly. The side end face of the upper valve disc 6 body structure 17 and the lower valve disc 3 body structure 17 that are opposite to each other is a second oblique sealing surface that gradually converges from right to left.
[0038] A pad 5 is provided in the cylindrical groove 18 of the upper valve disc 6, and a universal top 4 is provided in the cylindrical groove 18 of the lower valve disc 3. A spherical groove is provided on the lower end surface of the pad 5, and the upper end of the universal top 4 is a convex spherical column head structure. The convex spherical column head structure is tangentially fitted with the spherical groove. A gap is provided between the upper valve disc 6 and the lower valve disc 3. The upper ends of several compression springs 16 are respectively abutted against the bottom surfaces of several spring grooves 19 of the upper valve disc 6, and the lower ends of several compression springs 16 are respectively abutted against the bottom surfaces of several spring grooves 19 of the lower valve disc 3. The elastic force of several compression springs 16 is set according to the gravity of the upper valve disc 6, so that when the upper end surface of the lower valve disc 3 is horizontal, the lower end surface of the upper valve disc 6 also remains horizontal.
[0039] The valve body 1 has guide grooves 22 on the front and rear side walls of its inner cavity, which are arranged left and right. Two guide protrusions 20 slide in a one-to-one correspondence with the two guide grooves 22. The left end of the valve stem 8 has a T-shaped connecting structure. The left end of the valve stem 8 passes through the valve cover 7. The T-shaped connecting structure of the valve stem 8 is adapted to the T-shaped groove 21. When the valve stem 8 drives the valve disc assembly to slide left and right, the two second oblique sealing surfaces and the two first oblique sealing surfaces abut against each other or separate.
[0040] Existing wedge-type double gate valves are recommended for installation on horizontal pipelines. If installed on vertical pipelines, as shown in Figures 3 and 4, a universal joint and a pad are located between the two valve discs. These two valve discs can freely rotate around the spherical surface of the universal joint to compensate for errors in the machining of the sealing surface angle, ensuring sealing performance. The guide rib of the lower valve disc cooperates with the guide groove of the valve body, keeping the lower valve disc horizontal. The upper valve disc, due to its wedge structure, has its center of gravity located to the right of the centerline. Opening the valve causes the upper valve disc to rotate clockwise. The left side of the sealing surface of the upper valve disc rises upwards, while the right side falls downwards. When closing the valve, the left side of the sealing surface of the upper valve disc can easily hit the valve seat, causing damage to the sealing surface and valve seal failure.
[0041] This invention adds several compression springs 16 between the upper valve disc 6 and the lower valve disc 3. Since the elastic force of the two sets of compression springs 16 acts on the center of gravity of the upper valve disc 6, and the elastic force of the compression springs 16 is adjusted so that the lower end face of the upper valve disc 6 is in a horizontal state, after the valve disc assembly is installed in the valve body 1, the force state of the upper valve disc 6 is not changed when the valve is open, and the lower end face can still be kept in a horizontal state. That is, it can ensure that the second oblique sealing surface of the upper valve disc 6 is consistent with the oblique sealing surface of the valve seat 2 in the medium inlet 23. When the valve disc assembly is driven by the valve stem 8 to slide left and right along the guide groove 22, the valve disc assembly can close or open the medium flow channel, avoiding the problem of the upper valve disc 6 rotating and causing damage to the sealing oblique surface of the valve seat 2.
[0042] It also includes adjustable shims 14, of which there are several, and the thickness of the adjustable shims 14 varies sequentially. Any one of the adjustable shims 14 is set in the spring groove 19 of the lower valve disc 3. The lower end of the compression spring 16 abuts against the bottom surface of the corresponding spring groove 19 on the lower valve disc 3 through the adjustable shim 14. By replacing the adjustable shims 14 of different thicknesses, different compression springs 16 can be adapted.
[0043] The valve cover 7 is connected to the valve body 1 by a four-ring connection and sealed by a sealing ring.
[0044] The valve cover 7 and the valve stem 8 are sealed by a packing assembly.
[0045] The number of spring slots 19 in each group is one or two.
[0046] A bracket is provided at the right end of the valve body 1, and a bearing seat 10 is provided at the right end of the bracket. The lifting screw sleeve 9 is rotatably mounted in the bearing seat 10 through a thrust bearing. The actuator 11 is connected to the right end of the bearing seat 10, and the output end of the actuator 11 is connected to the right end of the lifting screw sleeve 9. The inner circumference of the lifting screw sleeve 9 is threadedly engaged with the outer circumference of the valve stem 8. One end of the guide rod 12 is sleeved on the valve stem 8. A guide elongated hole is provided on the bracket. The guide elongated hole is arranged along the axial direction of the valve stem 8, and the other end of the guide rod 12 is slidably engaged with the guide elongated hole.
[0047] Example 2: As shown in Figures 1 to 8, a wedge double gate valve assembly method is implemented based on the wedge double gate valve applicable to both horizontal and vertical pipelines described in Example 1. The method is characterized by the following steps:
[0048] Step 1: Make the slant plate fixture 15. The lower end face of the slant plate fixture 15 is a horizontal plane, and the upper end face of the slant plate fixture 15 has the same slope as the first slant sealing surface of the valve seat 2 located at the lower end.
[0049] Step 2: Place the lower valve disc 3 on the slant plate fixture 15 so that the upper end face of the lower valve disc 3 is horizontal;
[0050] Step 3: Install the universal top 4 into the cylindrical groove 18 of the lower valve disc 3, and install the pad 5 into the cylindrical groove 18 of the upper valve disc 6, so that the convex spherical head structure of the universal top 4 is tangentially fitted with the spherical groove of the pad 5. Fit the two ends of several compression springs 16 with the two sets of spring grooves 19 of the lower valve disc 3 and the two sets of spring grooves 19 of the upper valve disc 6 respectively. Check the levelness of the lower end face of the upper valve disc 6. By adding or removing adjustable shims 14 between the spring groove 19 of the lower valve disc 3 and the compression springs 16, the lower end face of the upper valve disc 6 is made to be in a horizontal state.
[0051] Step 4: Clamp the connecting flange 13 of the upper valve disc 6 and the lower valve disc 3 with the G-clamp to maintain the relative position and angle of the upper valve disc 6 and the lower valve disc 3.
[0052] Step 5: Insert the guide protrusions 20 formed on the front and rear sides of the valve disc assembly into the two guide grooves 22 of the valve body 1 one by one, remove the G-clamp, and connect the T-shaped connection structure of the valve stem 8 with the T-shaped groove 21 to complete the assembly of the other components of the gate valve.
[0053] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.
Claims
1. A wedge-type double gate valve applicable to both horizontal and vertical pipelines, comprising a valve body (1), the valve body (1) being a three-way component, wherein when the gate valve is used in a vertical pipeline, the medium inlet (23) and the medium outlet (24) of the valve body (1) are coaxially arranged to form a vertical medium flow channel, the side opening of the valve body (1) is arranged to the right, the valve cover (7) closes the side opening of the valve body (1), and valve seats (2) are provided on the through diameters of the medium inlet (23) and the medium outlet (24), and the opposite side end face of the two valve seats (2) is a first oblique sealing surface that gradually converges from right to left; Its features are: The valve assembly includes an upper valve (6) and a lower valve (3). The upper valve (6) includes a cylindrical body structure (17) and a connecting flange (13) located at the lower part of the body structure (17). The connecting flange (13) is offset to the right side of the body structure (17). The lower end face of the upper valve (6) is provided with a cylindrical groove (18) and two sets of spring grooves (19). The axis of the cylindrical groove (18) coincides with the axis of the body structure (17). The axis of the spring groove (19) is located to the right of the axis of the body structure (17). The center of gravity of the upper valve (6) is determined by the three-dimensional modeling of the upper valve (6). The two sets of spring grooves (19) are symmetrically arranged on the front and rear sides of the center of gravity of the upper valve (6). The upper valve disc (6) and the lower valve disc (3) have the same structure and are symmetrical. After the connecting flange (13) of the upper valve disc (6) and the lower valve disc (3) are combined, guide ridges (20) are formed on the front and rear sides of the valve disc assembly, and a T-shaped groove (21) is formed on the right side of the valve disc assembly. The side end face of the upper valve disc (6) body structure (17) and the lower valve disc (3) body structure (17) that are opposite to each other is a second oblique sealing surface that gradually converges from right to left. A pad (5) is provided in the cylindrical groove (18) of the upper valve disc (6), and a universal top (4) is provided in the cylindrical groove (18) of the lower valve disc (3). A spherical groove is provided on the lower end surface of the pad (5), and the upper end of the universal top (4) is a convex spherical column head structure. The convex spherical column head structure is tangentially fitted with the spherical groove. A gap is provided between the upper valve disc (6) and the lower valve disc (3). The upper ends of several compression springs (16) are respectively abutted against the bottom surfaces of several spring grooves (19) of the upper valve disc (6), and the lower ends of several compression springs (16) are respectively abutted against the bottom surfaces of several spring grooves (19) of the lower valve disc (3). The elastic force of several compression springs (16) is set according to the gravity of the upper valve disc (6), so that when the upper end surface of the lower valve disc (3) is horizontal, the lower end surface of the upper valve disc (6) is also kept horizontal. The valve body (1) has guide grooves (22) on the front and rear side walls of the inner cavity, and the guide grooves (22) are arranged on the left and right sides. Two guide protrusions (20) slide in a one-to-one correspondence with the two guide grooves (22). The left end of the valve stem (8) is provided with a T-shaped connection structure. The left end of the valve stem (8) passes through the valve cover (7). The T-shaped connection structure of the valve stem (8) is adapted to the T-shaped groove (21). When the valve stem (8) drives the valve disc assembly to slide left and right, the two second oblique sealing surfaces and the two first oblique sealing surfaces abut against each other or separate.
2. The wedge-type double gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: It also includes adjustable shims (14), there are several adjustable shims (14), the thickness of several adjustable shims (14) varies in sequence, any one of the adjustable shims (14) is set in the spring groove (19) of the lower valve disc (3), and the lower end of the compression spring (16) abuts against the bottom surface of the corresponding spring groove (19) on the lower valve disc (3) through the adjustable shim (14).
3. A wedge-type double gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: The valve cover (7) is connected to the valve body (1) by a four-ring and sealed by a sealing ring.
4. A wedge-type double gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: The valve cover (7) and valve stem (8) are slidably sealed by the packing assembly.
5. A wedge-type double gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: The number of spring slots (19) in each group is one or two.
6. A wedge-type double gate valve applicable to both horizontal and vertical pipelines according to any one of claims 2-5, characterized in that: A bracket is provided at the right end of the valve body (1), and a bearing seat (10) is provided at the right end of the bracket. The lifting screw sleeve (9) is rotatably set in the bearing seat (10) through the thrust bearing. The actuator (11) is connected to the right end of the bearing seat (10). The output end of the actuator (11) is connected to the right end of the lifting screw sleeve (9). The inner circumference of the lifting screw sleeve (9) is threaded with the outer circumference of the valve stem (8). One end of the guide rod (12) is sleeved on the valve stem (8). The bracket is provided with a guide elongated hole. The guide elongated hole is set along the axial direction of the valve stem (8). The other end of the guide rod (12) is slidably engaged with the guide elongated hole.
7. A method for assembling a wedge-type double gate valve, based on a wedge-type double gate valve applicable to both horizontal and vertical pipelines as described in any one of claims 2-6, characterized in that, Includes the following steps: Step 1: Make a slant plate fixture (15). The lower end face of the slant plate fixture (15) is a horizontal plane, and the upper end face of the slant plate fixture (15) is consistent with the slope of the first slant sealing surface of the valve seat (2) located at the lower end. Step 2: Place the lower valve disc (3) on the slant plate fixture (15) so that the upper end face of the lower valve disc (3) is horizontal; Step 3: Install the universal top (4) into the cylindrical groove (18) of the lower valve disc (3), and install the pad (5) into the cylindrical groove (18) of the upper valve disc (6), so that the convex spherical column structure of the universal top (4) is tangentially fitted with the spherical groove of the pad (5). Fit the two ends of several compression springs (16) with the two sets of spring grooves (19) of the lower valve disc (3) and the two sets of spring grooves (19) of the upper valve disc (6) respectively. Check the levelness of the lower end face of the upper valve disc (6). By adding or removing adjustable shims (14) between the spring groove (19) of the lower valve disc (3) and the compression springs (16), the lower end face of the upper valve disc (6) is made to be in a horizontal state. Step 4: Clamp the connecting flange (13) of the upper valve disc (6) and the lower valve disc (3) together using the G-clamp to maintain the relative position and angle of the upper valve disc (6) and the lower valve disc (3); Step 5: Insert the guide protrusions (20) formed on the front and rear sides of the valve disc assembly into the two guide grooves (22) of the valve body (1) one by one, remove the G-clamp, connect the T-shaped connection structure of the valve stem (8) with the T-shaped groove (21), and assemble the other components of the gate valve.