Wedge-type double-gate-plate gate valve suitable for horizontal and vertical pipelines and assembling method of wedge-type double-gate-plate gate valve

Abstract

The invention discloses a wedge-type double-gate-plate gate valve suitable for horizontal and vertical pipelines and an assembly method, belongs to the technical field of valves, and aims to solve the problem that when an existing wedge-type double-gate-plate gate valve is applied to the vertical pipeline, an upper valve clack rotates, and consequently a valve seat is collided. The gate valve comprises an upper valve clack and a lower valve clack, the upper valve clack comprises a cylindrical body structure and a connecting flange arranged on the lower portion of the body structure, a cylindrical groove and two spring grooves are formed in the lower end face of the upper valve clack, the axis of the cylindrical groove coincides with the axis of the body structure, and the two spring grooves are symmetrically formed in the front side and the rear side of the gravity center of the upper valve clack. The upper valve clack and the lower valve clack are the same in structure and are vertically symmetrical, a cushion block is arranged in a cylindrical groove of the upper valve clack, a universal top is arranged in a cylindrical groove of the lower valve clack, a plurality of compression springs are arranged among a plurality of spring grooves of the upper valve clack and the lower valve clack, and the elastic force of the compression springs avoids the problem that the upper valve clack rotates, and consequently the sealing slope of the valve seat is damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a wedge-type double-disc gate valve suitable for both horizontal and vertical pipelines and an assembly method. Background Art

[0002] The gate valve is sealed by the contact between the valve seat and the valve disc sealing surface. The opening and closing movement direction of the valve disc is perpendicular to the flow direction of the medium. The gate valve can only be fully opened or fully closed, and cannot be used as a regulating valve. The commonly used gate valve disc has two sealing surfaces forming a wedge shape, and the wedge angle is generally 5°. When the gate valve is closed, it relies on the medium force to achieve sealing, that is, the medium force pushes the sealing surface of the valve disc close to the sealing surface of the valve seat on the outlet side.

[0003] The wedge-type double-disc gate valve consists of two valve discs, with a universal top and a gasket in the middle of the two valve discs. The two valve discs can freely rotate around the spherical surface of the universal top to compensate for the error caused by the sealing surface angle processing process and ensure the sealing performance. The wedge-type double-disc gate valve is recommended to be installed on a horizontal pipeline. If it is installed on a vertical pipeline, the guide ribs of the lower valve disc and the guide grooves of the valve body cooperate, and the lower valve disc is in the horizontal direction. Since the upper valve disc is a wedge-type structure, the center of gravity of the entire upper valve disc is located on the right side of the center line, causing the upper valve disc to rotate clockwise after the valve is opened. The left side of the upper valve disc sealing surface is lifted up, and the right side of the sealing surface falls down. When closing the valve again, the left side of the sealing surface of the upper valve disc is easy to hit the valve seat, causing damage to the sealing surface and failure of the valve seal. Summary of the invention

[0004] The purpose of the present invention is to provide a wedge-type double-disc gate valve and an assembly method suitable for both horizontal and vertical pipelines, so as to solve the problem that when the existing wedge-type double-disc gate valve is used in a vertical pipeline, the center of gravity of the upper valve disc deviates from the center line, causing the upper valve disc to rotate after opening the valve, resulting in the valve seat being hit when the valve is closed again. The technical solution adopted by the present invention is as follows:

[0005] A wedge-type double-disc gate valve suitable for both horizontal and vertical pipelines, comprising a valve body, which is a three-way component. When the gate valve is used for a vertical pipeline, the medium inlet and the medium outlet of the valve body are coaxially arranged up and down to form a vertical medium flow channel, the side opening of the valve body is arranged to the right, the valve cover closes the side opening of the valve body, valve seats are arranged on the paths of the medium inlet and the medium outlet, and the end faces of the two valve seats on one side opposite to each other are first oblique sealing surfaces that gradually converge from right to left;

[0006] The valve flap assembly includes an upper valve flap and a lower valve flap, the upper valve flap includes a cylindrical main body structure and a connecting flange arranged at the lower part of the main body structure, the connecting flange is biased to the right side of the main body structure, a cylindrical groove and two groups of spring grooves are arranged on the lower end surface of the upper valve flap, the axis of the cylindrical groove coincides with the axis of the main body structure, the axis of the spring groove is located on the right side of the axis of the main body structure, the center of gravity position of the upper valve flap is determined by three-dimensional modeling of the upper valve flap, and the two groups of spring grooves are symmetrically arranged on both sides of the center of gravity of the upper valve flap;

[0007] The upper valve flap and the lower valve flap have the same structure and are symmetrical up and down. After the connecting flanges of the upper valve flap and the lower valve flap are combined, guide convex strips are formed on the front and rear sides of the valve flap assembly, and a T-shaped groove is formed on the right side of the valve flap assembly. The end surface of the body structure of the upper valve flap and the body structure of the lower valve flap 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, a universal top is provided in the cylindrical groove of the lower valve disc, a spherical groove is provided on the lower end surface of the pad, the upper end of the universal top is a convex spherical column head structure, the convex spherical column head structure is tangentially matched with the spherical groove, a gap is provided between the upper valve disc and the lower valve disc, the upper ends of a plurality of compression springs are respectively against the bottom surfaces of a plurality of spring grooves of the upper valve disc in a one-to-one correspondence, the lower ends of a plurality of compression springs are respectively against the bottom surfaces of a plurality of spring grooves of the lower valve disc in a one-to-one correspondence, the elastic force of the plurality of compression springs is set according to the gravity of the upper valve disc, so that when the upper end surface of the lower valve disc is horizontal, the lower end surface of the upper valve disc is also kept horizontal;

[0009] Guide grooves are respectively provided on the front side wall and the rear side wall of the inner cavity of the valve body, and the guide grooves are arranged on the left and right. The two guide convex strips are slidably matched with the two guide grooves in a one-to-one correspondence. A T-shaped connecting structure is provided at the left end of the valve stem, and the left end of the valve stem passes through the valve cover. The T-shaped connecting structure of the valve stem is adaptively connected 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 correspond to the two first oblique sealing surfaces in a one-to-one correspondence to seal or separate.

[0010] Furthermore, it also includes an adjustable gasket, which is in the form of a plurality of adjustable gaskets, the thickness of which varies sequentially, and any one of the adjustable gaskets is arranged in the spring groove of the lower valve disc, and the lower end of the compression spring is abutted against the corresponding bottom surface of the spring groove on the lower valve disc through the adjustable gasket.

[0011] Furthermore, the valve cover is connected to the valve body through a four-ring and is sealed by a sealing ring.

[0012] Furthermore, the valve cover and the valve stem are slidably sealed via a packing assembly.

[0013] Furthermore, the number of each group of spring slots is one or two.

[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 arranged 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 matched with the outer circumference of the valve stem, one end of the guide rod is sleeved on the valve stem, and a guide long hole is provided on the bracket, and the guide long hole is arranged along the axial direction of the valve stem, and the other end of the guide rod is slidingly matched with the guide long hole.

[0015] The present invention also provides a wedge-type double-disc gate valve assembly method, which is implemented based on the above-mentioned wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines, and includes the following steps:

[0016] Step 1: Make a swash plate tooling, the lower end surface of the swash plate tooling is a horizontal surface, and the upper end surface of the swash plate tooling has the same inclination as the first inclined sealing surface of the valve seat at the lower end;

[0017] Step 2: Place the lower valve disc on the swash plate fixture so that the upper end surface of the lower valve disc is horizontal;

[0018] Step 3: Install the universal top into the cylindrical groove of the lower valve disc, and install the gasket into the cylindrical groove of the upper valve disc, so that the convex spherical column head structure of the universal top is tangent to the spherical groove of the gasket, and the two ends of the compression springs are matched 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, and the horizontality of the lower end surface of the upper valve disc is detected. By adding or reducing the adjustable gasket between the spring groove of the lower valve disc and the compression spring, the lower end surface of the upper valve disc is in a horizontal state;

[0019] Step 4: Clamp the connecting flanges of the upper valve disc and the lower valve disc by means of a G-shaped clamp to keep the upper valve disc and the lower valve disc in relative position and angle;

[0020] Step 5: Insert the guide convex strips 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 with the T-shaped groove, and assemble the other components of the gate valve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Because the two sets of compressed elastic forces act on the center of gravity of the upper valve disc, and the elastic force of the compression spring is adjusted to make the lower end surface of the upper valve disc horizontal. After the valve disc assembly is installed in the valve body, the force state of the upper valve disc is not changed in the valve open state, and the lower end surface can still be kept horizontal, that is, the second oblique sealing surface of the upper valve disc can be guaranteed to be consistent with the first oblique sealing surface of the valve seat in the medium inlet. When the valve stem is used to drive the valve disc assembly to slide left and right along the guide groove, the valve disc assembly can close or open the medium flow channel to avoid the upper valve disc from rotating and causing damage to the valve seat sealing oblique surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the gate valve of the present invention;

[0024] Figure 2 yes Figure 1 A magnified image of point A;

[0025] Figure 3 It is a schematic diagram of the upper disc rotating when the existing wedge-type double-disc gate valve is opened in a vertical pipeline;

[0026] Figure 4 yes Figure 3 A magnified view of point B;

[0027] Figure 5 is a top view of the valve disc assembly;

[0028] Figure 6 is a cross-sectional view of the upper disc;

[0029] Figure 7 A cross-sectional view of the valve body;

[0030] Figure 8 A schematic diagram of the valve flap assembly being assembled on a swash plate tooling according to the assembly method of the present invention.

[0031] In the figure, 1. valve body, 2. valve seat, 3. lower valve disc, 4. universal top, 5. gasket, 6. upper valve disc, 7. valve cover, 8. valve stem, 9. lifting screw sleeve, 10. bearing seat, 11. actuator, 12. guide rod, 13. connecting flange, 14. adjustable gasket, 15. inclined plate tooling, 16. compression spring, 17. main body structure, 18. cylindrical groove, 19. spring groove, 20. guide ridge, 21. T-slot, 22. guide groove, 23. medium inlet, 24. medium outlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0033] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0035] Embodiment 1: Figure 1 to Figure 7 As shown, a wedge-type double-disc 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 set to be used in a vertical pipeline, the medium inlet 23 and the medium outlet 24 of the valve body 1 are coaxially arranged up and down to form a vertical medium flow channel. The side opening of the valve body 1 is arranged to the right, and the valve cover 7 closes the side opening of the valve body 1. Valve seats 2 are arranged on the diameters of the medium inlet 23 and the medium outlet 24. The end faces of the two valve seats 2 on one side opposite to each other are first oblique sealing surfaces that gradually converge from right to left, and the two valve seats 2 are symmetrical up and down.

[0036] The valve flap assembly includes an upper valve flap 6 and a lower valve flap 3. The upper valve flap 6 includes a cylindrical main body structure 17 and a connecting flange 13 arranged at the lower part of the main body structure 17. The connecting flange 13 is biased to the right side of the main body structure 17. A cylindrical groove 18 and two groups of spring grooves 19 are arranged on the lower end surface of the upper valve flap 6. The axis of the cylindrical groove 18 coincides with the axis of the main body structure 17. The axis of the spring groove 19 is located on the right side of the axis of the main body structure 17. The center of gravity position of the upper valve flap 6 is determined by three-dimensional modeling of the upper valve flap 6. The two groups of spring grooves 19 are symmetrically arranged on both sides of the center of gravity of the upper valve flap 6 to ensure that the spring force of the compression spring 16 acts on the center of gravity of the upper valve flap 6 and applies force symmetrically to ensure that the upper valve flap 6 is evenly stressed.

[0037] The upper valve flap 6 and the lower valve flap 3 have the same structure and are symmetrical up and down. After the connecting flanges 13 of the upper valve flap 6 and the lower valve flap 3 are combined, guide convex strips 20 are formed on the front and rear sides of the valve flap assembly, and a T-shaped groove 21 is formed on the right side of the valve flap assembly. The end surface of the body structure 17 of the upper valve flap 6 and the body structure 17 of the lower valve flap 3 that are opposite to each other is a second oblique sealing surface that gradually converges from right to left.

[0038] A cushion block 5 is provided in the cylindrical groove 18 of the upper valve disc 6, 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 cushion block 5, the upper end of the universal top 4 is a convex spherical column head structure, and the convex spherical column head structure is universally tangentially matched with the spherical groove, and a gap is provided between the upper valve disc 6 and the lower valve disc 3, and the upper ends of a plurality of compression springs 16 are respectively against the bottom surfaces of a plurality of spring grooves 19 of the upper valve disc 6 in a one-to-one correspondence, and the lower ends of a plurality of compression springs 16 are respectively against the bottom surfaces of a plurality of spring grooves 19 of the lower valve disc 3 in a one-to-one correspondence, and the elastic force of the plurality of 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;

[0039] Guide grooves 22 are respectively provided on the front side wall and the rear side wall of the inner cavity of the valve body 1, and the guide grooves 22 are arranged on the left and right. The two guide ridges 20 are slidably matched with the two guide grooves 22 in a one-to-one correspondence. A T-shaped connecting structure is provided at the left end of the valve stem 8, and 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 adaptively connected with 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 correspond to the two first oblique sealing surfaces in a one-to-one correspondence to seal or separate.

[0040] The existing wedge-type double-disc gate valve is recommended to be installed on a horizontal pipeline. If it is installed on a vertical pipeline, such as Figure 3 , Figure 4 As shown, there is a universal top and a gasket between the two valve discs. The two valve discs can rotate freely around the spherical surface of the universal top to compensate for the error caused by the sealing surface angle processing process and ensure the sealing performance. The guide ribs of the lower valve disc cooperate with the guide grooves of the valve body, and the lower valve disc is in the horizontal direction. Since the upper valve disc is a wedge-type structure, the center of gravity of the entire upper valve disc is located on the right side of the center line, which causes the upper valve disc to rotate clockwise after the valve is opened. The left side of the sealing surface of the upper valve disc is lifted up, and the right side of the sealing surface falls down. When closing the valve again, 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 failure of the valve seal.

[0041] The present invention adds a plurality of compression springs 16 between the upper valve flap 6 and the lower valve flap 3. Since the elastic force of the two groups of compression springs 16 acts on the center of gravity of the upper valve flap 6, and the elastic force of the compression springs 16 is adjusted to make the lower end surface of the upper valve flap 6 horizontal, after the valve flap assembly is installed in the valve body 1, the stress state of the upper valve flap 6 is not changed in the valve open state, and the lower end surface can still be kept horizontal, that is, it can ensure that the second oblique sealing surface of the upper valve flap 6 is consistent with the inclination state of the first oblique sealing surface of the valve seat 2 in the medium inlet 23. When the valve stem 8 drives the valve flap assembly to slide left and right along the guide groove 22, the valve flap assembly can close or open the medium flow channel to avoid the upper valve flap 6 from rotating and causing damage to the sealing oblique surface of the valve seat 2.

[0042] It also includes an adjustable gasket 14, and there are several adjustable gaskets 14. The thicknesses of the several adjustable gaskets 14 vary sequentially. Any adjustable gasket 14 is set in the spring groove 19 of the lower valve disc 3. The lower end of the compression spring 16 is abutted against the bottom surface of the corresponding spring groove 19 on the lower valve disc 3 through the adjustable gasket 14. By replacing adjustable gaskets 14 of different thicknesses, different compression springs 16 can be adapted.

[0043] The valve cover 7 is connected to the valve body 1 through a four-ring and is sealed by a sealing ring.

[0044] The valve cover 7 and the valve stem 8 are slidably sealed via a packing assembly.

[0045] The number of each group of spring slots 19 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. A lifting screw sleeve 9 is rotatably arranged in the bearing seat 10 through a thrust bearing. An actuator 11 is connected to the right end of the bearing seat 10, and an 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 matched 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 long hole is provided on the bracket, and the guide long hole is arranged along the axial direction of the valve stem 8. The other end of the guide rod 12 is slidably matched with the guide long hole.

[0047] Embodiment 2: Figures 1 to 8 As shown, a wedge-type double-disc gate valve assembly method is implemented based on a wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines as described in Example 1, and is characterized in that it includes the following steps:

[0048] Step 1: Make a swash plate tooling 15, the lower end surface of the swash plate tooling 15 is a horizontal surface, and the upper end surface of the swash plate tooling 15 has the same inclination as the first oblique sealing surface of the valve seat 2 at the lower end;

[0049] Step 2: Place the lower valve disc 3 on the swash plate fixture 15 so that the upper end surface of the lower valve disc 3 is in a horizontal state;

[0050] Step 3, install the universal top 4 into the cylindrical groove 18 of the lower valve disc 3, install the cushion block 5 into the cylindrical groove 18 of the upper valve disc 6, make the convex spherical column head structure of the universal top 4 tangent to the spherical groove of the cushion block 5, match the two ends of a plurality of compression springs 16 with the two groups of spring grooves 19 of the lower valve disc 3 and the two groups of spring grooves 19 of the upper valve disc 6 respectively, detect the horizontality of the lower end surface of the upper valve disc 6, and make the lower end surface of the upper valve disc 6 be in a horizontal state by adding or reducing the adjustable gasket 14 between the spring groove 19 of the lower valve disc 3 and the compression spring 16;

[0051] Step 4: Clamp the connection flange 13 of the upper valve flap 6 and the lower valve flap 3 by a G-shaped clamp, so that the upper valve flap 6 and the lower valve flap 3 maintain a relative position and angle;

[0052] Step 5: Insert the guide ridges 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.

[0053] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A wedge-type double-disc gate valve suitable for both horizontal and vertical pipelines, comprising a valve body (1), the valve body (1) being a three-way component, and when the gate valve is used for a vertical pipeline, a medium inlet (23) and a medium outlet (24) of the valve body (1) are coaxially arranged up and down to form a vertical medium flow channel, the side opening of the valve body (1) is arranged to the right, a valve cover (7) closes the side opening of the valve body (1), valve seats (2) are arranged on the paths of the medium inlet (23) and the medium outlet (24), and the end faces of the two valve seats (2) on one side opposite to each other are first oblique sealing surfaces that gradually converge from right to left; Features: The valve flap assembly comprises an upper valve flap (6) and a lower valve flap (3), the upper valve flap (6) comprising a cylindrical main body structure (17) and a connecting flange (13) arranged at the lower part of the main body structure (17), the connecting flange (13) being biased to the right side of the main body structure (17), the lower end surface of the upper valve flap (6) being provided with a cylindrical groove (18) and two groups of spring grooves (19), the axis line of the cylindrical groove (18) coincides with the axis line of the main body structure (17), the axis line of the spring groove (19) being located to the right side of the axis line of the main body structure (17), the center of gravity position of the upper valve flap (6) being determined by three-dimensional modeling of the upper valve flap (6), and the two groups of spring grooves (19) being symmetrically arranged at the front and rear sides of the center of gravity of the upper valve flap (6); The upper valve flap (6) and the lower valve flap (3) have the same structure and are symmetrical in the upper and lower parts. After the connecting flanges (13) of the upper valve flap (6) and the lower valve flap (3) are assembled, guide convex strips (20) are formed on the front and rear sides of the valve flap assembly, and a T-shaped groove (21) is formed on the right side of the valve flap assembly. The end faces of the main body structure (17) of the upper valve flap (6) and the main body structure (17) of the lower valve flap (3) on the opposite side are second oblique sealing surfaces that gradually converge from right to left. A cushion block (5) is provided in the cylindrical groove (18) of the upper valve disc (6), 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 cushion block (5), the upper end of the universal top (4) is a convex spherical column head structure, the convex spherical column head structure is universally tangentially matched with the spherical groove, a gap is provided between the upper valve disc (6) and the lower valve disc (3), the upper ends of a plurality of compression springs (16) are respectively abutted against the bottom surfaces of a plurality of spring grooves (19) of the upper valve disc (6), and the lower ends of a plurality of compression springs (16) are respectively abutted against the bottom surfaces of a plurality of spring grooves (19) of the lower valve disc (3), the elastic force of the plurality of 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 front side wall and the rear side wall of the inner cavity of the valve body (1) are respectively provided with guide grooves (22), the guide grooves (22) are arranged on the left and right sides, the two guide ridges (20) are slidably matched with the two guide grooves (22) in a one-to-one correspondence, 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 adaptively connected with the T-shaped groove (21), when the valve stem (8) drives the valve flap assembly to slide left and right, the two second oblique sealing surfaces correspond to the two first oblique sealing surfaces in a one-to-one correspondence to seal or separate.

2. A wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: It also includes an adjustable gasket (14), wherein there are a plurality of adjustable gaskets (14), the thicknesses of which vary sequentially, and any one of the adjustable gaskets (14) is arranged in a spring groove (19) of the lower valve disc (3), and the lower end of the compression spring (16) is abutted against the bottom surface of the corresponding spring groove (19) on the lower valve disc (3) through the adjustable gasket (14).

3. A wedge-type double-disc 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) via a four-ring connection and is sealed via a sealing ring.

4. A wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: The valve cover (7) and the valve stem (8) are slidably sealed via a packing assembly.

5. A wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines according to claim 1, characterized in that: The number of each group of spring grooves (19) is one or two.

6. A wedge-type double-disc gate valve suitable for both horizontal and vertical pipelines according to any one of claims 2 to 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. A lifting screw sleeve (9) is rotatably arranged in the bearing seat (10) through a thrust bearing. An actuator (11) is connected to the right end of the bearing seat (10), and an 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 matched 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 long hole is provided on the bracket, and the guide long hole is arranged along the axial direction of the valve stem (8). The other end of the guide rod (12) is slidably matched with the guide long hole.

7. A method for assembling a wedge-type double-disc gate valve, which is realized by using a wedge-type double-disc gate valve applicable to both horizontal and vertical pipelines as claimed in any one of claims 2 to 6, characterized in that: The following steps are involved: Step 1: manufacturing a swash plate tooling (15), wherein the lower end surface of the swash plate tooling (15) is a horizontal surface, and the upper end surface of the swash plate tooling (15) has the same inclination as the first oblique sealing surface of the valve seat (2) located at the lower end; Step 2: Place the lower valve disc (3) on the swash plate fixture (15) so that the upper end surface of the lower valve disc (3) is in a horizontal state; Step 3: Install the universal top (4) into the cylindrical groove (18) of the lower valve disc (3), install the cushion block (5) into the cylindrical groove (18) of the upper valve disc (6), make the convex spherical column head structure of the universal top (4) tangentially match with the spherical groove of the cushion block (5), respectively match the two ends of a plurality of compression springs (16) with the two groups of spring grooves (19) of the lower valve disc (3) and the two groups of spring grooves (19) of the upper valve disc (6), detect the horizontality of the lower end surface of the upper valve disc (6), and make the lower end surface of the upper valve disc (6) in a horizontal state by adding or removing the adjustable gasket (14) between the spring groove (19) of the lower valve disc (3) and the compression spring (16); Step 4: Clamp the connecting flanges (13) of the upper valve flap (6) and the lower valve flap (3) together by means of a G-shaped clamp, so that the upper valve flap (6) and the lower valve flap (3) maintain a relative position and angle; Step 5: Insert the guide ridges (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.

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