Liquid-filled valve seal face structure

Abstract

The utility model discloses a kind of liquid-filled valve sealing surface structure, process a sealing ring groove on the sealing surface of valve body and sealing disc, set up elastic sealing ring in it, when sealing ring is extruded, sealing ring is extruded and two sealing surfaces form static seal, can withstand high pressure or superhigh pressure, sealing surface can be set into conical surface, plane, plane and cylindrical surface combination etc. Form, compensation piston can also be set simultaneously, can avoid negative pressure in hydraulic cavity or by piston type booster cylinder and sealing disc synchronous action, since static seal structure is adopted, can resist greater than 63Mpa superhigh pressure simultaneously, reach low cost, high reliability target.

Description

Technical Field

[0001] This utility model relates to a hydraulic mechanism, specifically a filling valve cover structure. Background Technology

[0002] Fluid filling valves are widely used in hydraulic systems that require rapid and slow advance switching of cylinders and pistons. Their structure involves a pull rod that actuates a movable sealing disc, which has a sealing surface. The valve body also has a corresponding sealing surface. When the movable sealing disc is pulled by the pull rod, causing the sealing surfaces on the movable sealing disc and valve body to come into contact, pressure begins to build up inside the hydraulic cylinder. When the pull rod pulls the piston sealing disc, separating the sealing surfaces, the liquid inside the hydraulic cylinder and the liquid in the tank can flow freely. However, in existing technologies, the fit between the two sealing surfaces is highly demanding, and the sealing effect is significantly affected when impurities in the liquid are adsorbed onto the sealing surfaces. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a sealing surface structure for a filling valve, which effectively overcomes the shortcomings of existing technologies.

[0004] This utility model is achieved through the following technical solution: a liquid filling valve sealing surface structure, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device. The valve body is connected to the liquid tank and the inner cavity of the hydraulic cylinder. Both the movable sealing disc and the valve body have corresponding sealing surfaces. The pull rod pulls the movable sealing disc to allow the two sealing surfaces to be in two states: open and closed. In the open state, the liquid can flow freely between the liquid tank and the inner cavity of the hydraulic cylinder. In the closed state, pressurized liquid in the inner cavity of the hydraulic cylinder is prevented from entering the liquid tank. Both the movable sealing disc and the valve body have mutually cooperating sealing surfaces. One of the sealing surfaces has a sealing ring groove containing an elastic sealing ring. In the open state, the elastic sealing ring is partially exposed in the sealing ring groove. In the closed state, the elastic sealing ring is compressed and together with the two sealing surfaces, forms a static sealing structure.

[0005] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are both conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

[0006] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are respectively a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with dynamic fit between the cylindrical surface and the cylindrical hole.

[0007] This utility model discloses a sealing surface structure for a filling valve, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device. The valve body is connected to both a liquid tank and the inner cavity of a hydraulic cylinder. Both the movable sealing disc and the valve body have corresponding sealing surfaces. The pull rod pulls the movable sealing disc, allowing the two sealing surfaces to be in two states: open and closed. In the open state, liquid can flow freely between the liquid tank and the inner cavity of the hydraulic cylinder. In the closed state, pressurized liquid in the inner cavity of the hydraulic cylinder is prevented from entering the liquid tank. Both the movable sealing disc and the valve body have mutually cooperating sealing surfaces. One of the sealing surfaces has a sealing ring groove containing an elastic sealing ring. In the open state, the elastic sealing ring is partially exposed in the sealing ring groove. In the closed state, the elastic sealing ring is compressed and forms a static sealing structure together with the two sealing surfaces. The inner cavity side of the hydraulic cylinder has a compensation cylinder consisting of a compensation cylinder body and a compensation piston, and the compensation piston can move automatically.

[0008] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are both conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

[0009] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are respectively a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with dynamic fit between the cylindrical surface and the cylindrical hole.

[0010] This utility model discloses a sealing surface structure for a filling valve, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device. The valve body is connected to both a liquid tank and the inner cavity of a hydraulic cylinder. Both the movable sealing disc and the valve body have corresponding sealing surfaces. The pull rod pulls the movable sealing disc, allowing the two sealing surfaces to be in two states: open and closed. In the open state, liquid can flow freely between the liquid tank and the inner cavity of the hydraulic cylinder. In the closed state, pressurized liquid in the inner cavity of the hydraulic cylinder is prevented from entering the liquid tank. Both the movable sealing disc and the valve body have mutually cooperating sealing surfaces. One of the sealing surfaces has a sealing ring groove containing an elastic sealing ring. In the open state, the elastic sealing ring is partially exposed in the sealing ring groove. In the closed state, the elastic sealing ring is compressed and forms a static sealing structure together with the two sealing surfaces. The hydraulic cylinder inner cavity side has a booster cylinder body and a booster piston, and a booster piston drive mechanism constitutes a booster cylinder assembly.

[0011] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are both conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

[0012] As a preferred technical solution, the sealing surfaces on the movable sealing disc and the valve body are respectively a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with dynamic fit between the cylindrical surface and the cylindrical hole.

[0013] The beneficial effects of this utility model are as follows: A sealing ring groove is machined on the sealing surface of the valve body and the sealing disc, and an elastic sealing ring is set in it. When the sealing ring is squeezed, the sealing ring and the two sealing surfaces form a static seal, which can withstand high pressure or ultra-high pressure. The sealing surface can be set into the form of conical surface, plane, or a combination of plane and cylindrical surface. A compensation piston can also be set at the same time to avoid negative pressure in the hydraulic chamber or synchronous action of piston-type booster cylinder and sealing disc. Due to the adoption of static sealing structure, it can withstand ultra-high pressure greater than 63Mpa while achieving the goal of low cost and high reliability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the open state of the elastic sealing filling valve of this utility model.

[0016] Figure 2 This is a schematic diagram of the closed state of the elastic sealing filling valve of this utility model;

[0017] Figure 3 is a schematic diagram of the inclined sealing surface of the elastic sealing liquid filling valve of this utility model;

[0018] Figure 4 is a schematic diagram of the flat sealing surface of the elastic sealing liquid filling valve of this utility model;

[0019] Figure 5 is a schematic diagram of the cylindrical sealing ring of the elastic sealing liquid filling valve of this utility model;

[0020] Figure 6 This is a schematic diagram of the elastic sealing filling valve with compensation piston of this utility model in the open state.

[0021] Figure 7 This is a schematic diagram of the elastic sealing filling valve with compensation piston in the closed state according to this utility model;

[0022] Figure 8 This is a schematic diagram of the elastic sealing filling valve with high-pressure liquid inlet of this utility model;

[0023] Figure 9 This is a schematic diagram of the elastic sealing filling valve with pressure boosting piston of this utility model in the open state;

[0024] Figure 10 This is a schematic diagram of the closed state of the elastic sealing filling valve of this utility model;

[0025] Figure 11This is a diagram illustrating an application example of the pressurizing piston in the elastic sealing liquid filling valve of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Movable sealing disc; 101. Sealing conical surface; 102. Pull rod hole; 103. Sealing plane; 104. Sealing cylindrical surface; 105. Sealing end face; 106. Conical sealing disc sealing ring groove; 107. Flat sealing disc sealing ring groove; 108. Cylindrical sealing disc sealing ring groove; 2. Valve body with sealing ring; 201. Inclined surface; 202. Inclined sealing ring groove; 203. Liquid tank connection port; 204. Flat sealing surface; 205. Flat sealing ring groove; 206. Body inner hole; 207. Cylindrical sealing ring groove; 208. Body sealing end face; 209. Main hydraulic cylinder connection; 3. Sealing ring; 4. Sealing disc pull rod; 5. Sealing disc pulls the cylinder body; 6. Sealing disc closes the oil inlet; 7. Sealing disc pulls the piston; 8. Sealing disc opens the oil inlet; 9. Filling valve interface; 10. Main hydraulic cylinder body; 1001. Filling valve connection 1002, Piston cylinder interface; 1003, Main hydraulic cylinder body fluid chamber; 1004, Main hydraulic cylinder body high-pressure interface; 11, Compensating piston cylinder body; 12, Compensating piston; 13, Intensifying cylinder body; 14, Intensifying piston; 1401, Intensifying piston connecting part; 15, Intensifying sealing ring; 16, Connecting pin; 17, Intensifying piston drive rod; 18, Intensifying piston drive cylinder body; 1801, Intensifying piston drive cylinder 1802. Pressurized oil inlet of booster piston drive cylinder; 19. Piston of booster piston drive cylinder; 20. Head plate; 21. Tail plate; 22. Tie rod; 23. Middle plate; 24. Moving mold; 25. Fixed mold; 26. Middle plate drive cylinder body; 2601. Mold closing oil inlet; 2602. Mold opening oil inlet; 27. Middle plate drive piston; 28. Mold locking hydraulic cylinder seal ring; 29. ​​Mold locking hydraulic cylinder piston. Detailed Implementation

[0028] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0029] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0030] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] The terms used in this invention, such as “above,” “over,” “below,” and “under,” indicating spatial relative position, are for ease of description to depict the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms of spatial relative position may be intended to include different orientations of the device in use or operation other than those shown in the figures. For example, if the device in the figures is flipped, a unit described as being “below” or “under” other units or features would be located “above” other units or features. Therefore, the exemplary term “under” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise), and the spatially related descriptive terms used herein will be interpreted accordingly.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Example 1

[0035] like Figure 1 and Figure 2As shown, the device consists of a movable sealing disc 1, a valve body 2 with a sealing ring, and a sealing ring 3. The movable sealing disc 1 has a pull rod hole 102 in the middle, on which a sealing disc pull rod 4 is mounted. The sealing disc pull rod 4 connects to a sealing disc-pulling piston 7, which can move up and down within the hole of the sealing disc-pulling cylinder body 5. When the sealing disc closes the oil inlet 6 to allow oil to enter, the sealing disc-pulling piston 7 drives the sealing disc pull rod 4 to pull the movable sealing disc 1 upwards. When the sealing disc opens the oil inlet 8 to allow oil to enter, the sealing disc-pulling piston 7 and the sealing disc pull rod 4 move the movable sealing disc 1 downwards. A liquid tank connection port 203 connects to the liquid tank, and a main hydraulic cylinder connection port 209 connects to the main hydraulic cylinder. Figure 1 The state is that the sealing disc opens the oil inlet 8 to allow oil to enter. The sealing disc pulls the piston 7 and the sealing disc rod 4 to move the movable sealing disc 1 downwards. In the figure, the sealing disc rod 4 is driven up and down by a hydraulic cylinder, but it can also be driven by a hydraulic cylinder, spring, electromagnetic force, pneumatic drive, or a combination of drives. Arrow a in the figure connects to the liquid tank, and arrow b connects to the main hydraulic cylinder. The liquid in the liquid tank can move with the piston in the main hydraulic cylinder. The liquid tank flows rapidly with the liquid in the main hydraulic cylinder through a and b. The sealing conical surface 101 is a conical surface, and the inclined surface 201 corresponding to the sealing conical surface 101 has an inclined surface 202 with a liquid tank connection port 203. Figure 2 Oil enters through the closed oil inlet 6 of the sealing disc. The sealing disc pulls the piston 7 and the sealing disc rod 4, causing the movable sealing disc 1 to rise. This causes the sealing conical surface 101 and the inclined surface 201 to come into contact, and the sealing ring 3 is compressed within the inclined sealing ring groove 202. The compression rate of the sealing ring is 10%-15% according to the static sealing standard, thus achieving a seal between the sealing conical surface 101 and the inclined surface 201. Figure 1 and Figure 2 The sealing conical surface 101 and inclined surface 201 can be conical, planar, or cylindrical surfaces. In Figure 3a, there is a gap between the sealing conical surface 101 and the sealing ring 3, allowing the liquid to flow freely when it moves relative to the main hydraulic cylinder body and piston. The liquid in the inner cavity of the main hydraulic cylinder body is connected to the liquid tank. Figure 3b When the sealing conical surface 101 and the sealing ring 3 begin to contact, the liquid in the main hydraulic cylinder cavity and the liquid in the tank stop flowing. Figure 3c The sealing conical surface 101 and the inclined surface 201 are fitted together, and the sealing ring 3 in the middle forms a static seal between the two conical surfaces 101 and 201. Figure 3d A conical sealing disc groove 106 is provided on the movable sealing disc 1, and a sealing ring 3 is placed therein. Figure 4a The movable sealing disc 1 has a sealing plane 103, and the valve body 2 with the sealing ring has a corresponding flat sealing surface 204 and a flat sealing ring groove 205. At this time, there is a gap between the sealing plane 103 and the sealing ring 3, allowing the liquid to flow freely. Figure 4b The sealing plane 103 and the sealing ring 3 begin to contact. Figure 4c It is a fit between sealing surface 103 and flat sealing surface 204. Figure 4dA flat sealing ring groove 107 is provided on the movable sealing disc 1, and a sealing ring 3 is placed therein. Figure 5a The movable sealing disc 1 has a sealing cylindrical surface 104 and a sealing end face 105. The valve body 2 with the sealing ring has a body inner hole 206. The sealing cylindrical surface 104 and the body inner hole 206 are dynamically fitted. Alternatively, a cylindrical hole can be provided on the movable sealing disc 1, and a cylindrical surface can be provided on the valve body to achieve the same function, along with a cylindrical surface sealing ring groove 207 and a body sealing end face 208. In this case, there is a gap between the sealing cylindrical surface 104, the sealing end face 105, and the sealing ring body 2. Figure 5b The sealing cylindrical surface 104 and the sealing end face 105 in the middle contact the sealing ring 3. Figure 5c The sealing end face 105 and the main body sealing end face 208 are fitted together. Figure 5d A cylindrical sealing disc sealing ring groove 108 is provided on the movable sealing disc 1, and a sealing ring 3 is placed therein. The sealing ring 3 in Figure 5 can be an O-ring or a combination of high-pressure resistant sealing rings. Due to the static sealing structure between the two sealing surfaces, it can withstand high pressure or ultra-high pressure greater than 63 MPa and has a simple and durable structure.

[0036] Example 2

[0037] like Figure 6 and Figure 7 As shown, unlike Embodiment 1, the device in this embodiment is connected to the main hydraulic cylinder 10 via the filling valve interface 9. The main hydraulic cylinder 10 has a filling valve interface 1001 connected to the device in Embodiment 1. The main hydraulic cylinder chamber 1003 and the piston cylinder interface 1002 are connected to the compensating piston cylinder 11 and the compensating piston 12. In Embodiment 1... Figures 3b to 3c state, Figures 4b to 4c state, Figures 5b to 5c In this state, the liquid in the main hydraulic cylinder's fluid chamber 1003 will form a negative pressure. The compensating piston 12 is in a free state within the inner bore of the compensating piston cylinder 11, causing the compensating piston 12 to automatically move downwards to compensate for the negative pressure in the main hydraulic cylinder's fluid chamber 1003. At this time, if... Figure 7 As shown, the compensation piston 12 moves downward.

[0038] Example 3

[0039] Unlike the above embodiments, as follows Figure 8 The main hydraulic cylinder body 10 shown has a main hydraulic cylinder body high-pressure port 1004, which is connected to high-pressure fluid. Figure 7 When the filling valve is closed, the main hydraulic cylinder body liquid chamber 1003 is pressurized.

[0040] Example 4

[0041] Unlike Embodiment 2, the piston cylinder interface 1002 is connected to the booster cylinder body 13, which contains a booster piston 14. A booster sealing ring 15 is located between the inner bore of the booster cylinder body 13 and the booster piston 14. The booster piston 14 has a booster piston connecting part 1401. Above the booster cylinder body 13, there is a booster piston drive cylinder, composed of a booster piston drive rod 17, a booster piston drive cylinder body 18, and a booster piston drive cylinder piston 19. The booster piston drive cylinder body 18 has a booster piston drive cylinder return oil inlet 1801 and a booster piston drive cylinder pressurization oil inlet 1802. The booster piston connecting part 1401 and the booster piston drive rod 17 each have holes through which a connecting pin 16 passes. The two are connected. When the sealing disc closes the oil inlet 6 to allow oil to enter, the sealing disc pulls the piston 7 and the sealing disc rod 4 to pull the movable sealing disc 1 upward. At the same time, the pressurized piston drive cylinder pressurized oil inlet 1802 also allows oil to enter. The pressurized piston drive rod 17 and the pressurized piston drive cylinder piston 19 press down the pressurized piston 14 to compensate for the negative pressure in the main hydraulic cylinder body liquid chamber 1003 caused by the elastic deformation of the filling valve sealing ring and to pressurize the main hydraulic cylinder body liquid chamber 1003. The cross-sectional area of ​​the pressurized piston drive cylinder piston 19 is A1, the cross-sectional area of ​​the pressurized piston 14 is A2, the hydraulic pressure at the inlet of the pressurized piston drive cylinder pressurized oil inlet 1802 is P1, and the pressure in the main hydraulic cylinder body liquid chamber 1003 is P2. Figure 11 This is a schematic diagram of its use in injection molding and die casting machines. The head plate 20, tail plate 21, and tie rod 22 form a load-bearing frame mounted on the base. The middle plate 23 is mounted on a guide rail (not shown in the diagram). The moving mold 24 is mounted on the middle plate 23, and the fixed mold 25 is mounted on the head plate 20. The middle plate drive cylinder 26 is mounted between the tail plate 21 and the middle plate 23. Hydraulic oil is injected into the mold closing inlet 2601, causing the middle plate drive piston 27 to drive the middle plate 23 and the moving mold 24 to close. Figure 11 (In the mold-closed state), before mold closing, as follows Figure 9 As shown, when the filling valve is opened, the liquid in the main hydraulic cylinder's liquid chamber 1003 flows freely through the filling valve interface 1001 and the liquid in the liquid tank. When the mold is closed, Figure 9 Hydraulic oil enters through the sealing disc at inlet 6. The sealing disc pulls piston 7, which in turn moves sealing disc rod 4 to raise the movable sealing disc 1. Simultaneously, the pressure piston drives the hydraulic cylinder to pressurize the inlet 1802, allowing hydraulic oil to enter. The pressure booster piston drive rod 17 and the pressure booster piston drive cylinder piston 19 move the pressure booster piston 14 downward. After completion, as shown... Figure 10 As shown, if P1 is 15 MPa and P2 is required to reach 60 MPa, then That is, the cross-sectional area of ​​the booster piston driving the hydraulic cylinder piston 19 should be 4 times the cross-sectional area of ​​the booster piston 14.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A sealing surface structure for a filling valve, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device, wherein the valve body is connected to a liquid tank and a hydraulic cylinder cavity respectively, and both the movable sealing disc and the valve body have corresponding sealing surfaces; the pull rod pulls the movable sealing disc to allow the two sealing surfaces to be in two states: open and closed. In the open state, liquid can flow freely between the liquid tank and the hydraulic cylinder cavity; in the closed state, pressurized liquid in the hydraulic cylinder cavity is prevented from entering the liquid tank, characterized in that: Both the movable sealing disc and the valve body have mating sealing surfaces. One of the sealing surfaces has a sealing ring groove containing an elastic sealing ring. In the open state, the elastic sealing ring is partially exposed in the sealing ring groove. In the closed state, the elastic sealing ring is compressed and together with the two sealing surfaces, they form a static sealing structure.

2. The sealing surface structure of the filling valve according to claim 1, characterized in that: Both the sealing surfaces on the movable sealing disc and the valve body are conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

3. The sealing surface structure of the filling valve according to claim 1, characterized in that: The sealing surfaces on the movable sealing disc and the valve body are a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane, respectively. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with a dynamic fit between the cylindrical surface and the cylindrical hole.

4. A sealing surface structure for a filling valve, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device, wherein the valve body is connected to a liquid tank and a hydraulic cylinder cavity respectively, and both the movable sealing disc and the valve body have corresponding sealing surfaces; the pull rod pulls the movable sealing disc to allow the two sealing surfaces to be in two states: open and closed. In the open state, liquid can flow freely between the liquid tank and the hydraulic cylinder cavity; in the closed state, pressurized liquid in the hydraulic cylinder cavity is prevented from entering the liquid tank, characterized in that: Both the movable sealing disc and the valve body have mating sealing surfaces. One of the sealing surfaces has a sealing ring groove containing an elastic sealing ring. In the open state, the elastic sealing ring is partially exposed in the sealing ring groove. In the closed state, the elastic sealing ring is compressed and together with the two sealing surfaces, they form a static sealing structure. The hydraulic cylinder has a compensation cylinder consisting of a compensation cylinder body and a compensation piston on the inner side. The compensation piston can move automatically.

5. The sealing surface structure of the filling valve according to claim 4, characterized in that: Both the sealing surfaces on the movable sealing disc and the valve body are conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

6. The sealing surface structure of the filling valve according to claim 4, characterized in that: The sealing surfaces on the movable sealing disc and the valve body are a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane, respectively. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with a dynamic fit between the cylindrical surface and the cylindrical hole.

7. A sealing surface structure for a filling valve, comprising a valve body, a movable sealing disc, a pull rod, and a pull rod control device, wherein the valve body is connected to a liquid tank and a hydraulic cylinder cavity respectively, and the movable sealing disc and the valve body each have corresponding sealing surfaces, and the pull rod pulls the movable sealing disc to allow the two sealing surfaces to be in two states: open and closed. In the open state, liquid can flow freely between the liquid tank and the hydraulic cylinder cavity; in the closed state, pressurized liquid in the hydraulic cylinder cavity is prevented from entering the liquid tank, characterized in that: Both the movable sealing disc and the valve body have mating sealing surfaces. One of the sealing surfaces has a sealing ring groove with an elastic sealing ring inside. When the valve is open, the elastic sealing ring is partially exposed in the sealing ring groove. When the valve is closed, the elastic sealing ring is compressed and forms a static sealing structure together with the two sealing surfaces. The hydraulic cylinder has a booster cylinder body and a booster piston on the inner side, and the booster cylinder assembly consists of a booster piston drive mechanism.

8. The sealing surface structure of the filling valve according to claim 7, characterized in that: Both the sealing surfaces on the movable sealing disc and the valve body are conical or flat surfaces, and in the closed state, the two conical or flat surfaces are in contact.

9. The sealing surface structure of the filling valve according to claim 7, characterized in that: The sealing surfaces on the movable sealing disc and the valve body are a plane plus a cylindrical surface and a cylindrical hole perpendicular to the plane, respectively. In the closed state, the two planes are in contact, and the sealing groove is on the cylindrical surface or the cylindrical hole, with a dynamic fit between the cylindrical surface and the cylindrical hole.

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