Valve body assembly, pump body and construction machine

Abstract

The application relates to the technical field of pump body structures, and discloses a valve body assembly, a pump body and engineering machinery, which comprise a valve body and an elastic sealing piece. A fixed part and a contact part are arranged on the valve body, the contact part is used for contacting a valve seat, and the contact part is annular. The elastic sealing piece is arranged on the fixed part, a sealing part is arranged on the elastic sealing piece, the sealing part is annular, and the sealing part is used for contacting the valve seat. The ratio of the size of the contact part along the radial direction of the contact part to the size of the sealing part along the radial direction of the sealing part is 50% to 70%, or the ratio of the size of the sealing part along the radial direction of the sealing part to the size of the contact part along the radial direction of the contact part is 50% to 70%, so that the problem that the valve body assembly has a high maintenance frequency and high maintenance cost is solved or improved.

Description

Technical Field

[0001] This application relates to the field of pump body structure technology, specifically to valve assembly, pump body and engineering machinery. Background Technology

[0002] The valve assembly is a key component in oil drilling equipment, commonly found in fracturing pumps, mud pumps, and other equipment. Its main function is to fit tightly with the valve box cone bore to achieve a sealing effect when closed, and to work in conjunction with the valve seat to complete the operations of fluid discharge (opening) and sealing (closing).

[0003] In related technologies, fracturing is the main way to increase oil and gas production in oil and gas field development. As a key component of fracturing equipment, the plunger pump provides power through the power end, driving the plunger to perform high-speed reciprocating linear motion, thereby driving the fracturing medium in the hydraulic end valve box (hydraulic end pump head) of the plunger pump to be drawn in and discharged to achieve pumping. The valve assembly and valve seat are key components of the fracturing medium intake and discharge channels. During the continuous intake and discharge of fracturing medium, the valve assembly opens and closes at high speed.

[0004] However, the valve assembly is equipped with valve rubber, and the valve assembly and the valve seat are subjected to high-speed reciprocating collisions during high-speed movement, resulting in a very short lifespan for the valve assembly, increasing the maintenance frequency and maintenance costs. Utility Model Content

[0005] This application provides a valve assembly, a pump body, and engineering machinery to solve or improve the problems of high maintenance frequency and high maintenance costs of valve assemblies.

[0006] On one hand, this application provides a valve assembly, including a valve body and an elastic seal. The valve body has a fixing portion and a contact portion, the contact portion being for contacting a valve seat, and the contact portion being annular. The elastic seal is disposed on the fixing portion, and the elastic seal has a sealing portion, the sealing portion being annular, and the sealing portion being for contacting the valve seat. The ratio of the radial dimension of the contact portion to the radial dimension of the sealing portion is 50% to 70%, or the ratio of the radial dimension of the sealing portion to the radial dimension of the contact portion is 50% to 70%.

[0007] Beneficial effects: For valve assemblies where the ratio of the radial dimension of the contact part to the radial dimension of the sealing part is 50% to 70%, the pump body operates at low pressure and has a lower liquid supply frequency. By increasing the proportion of the valve body, the overall weight of the valve assembly is increased, which can reduce the impact force more effectively, resulting in a better sealing effect and thus increasing the service life.

[0008] A valve assembly with a radial dimension of the sealing part to a radial dimension of the contact part of the contact part of 50% to 70% will have a higher fluid supply frequency when the body is under high pressure. By increasing the contact ratio between the elastic seal and the valve seat, the overall weight of the valve assembly will be reduced, the impact force on the valve will be relatively reduced, and the buffering force provided by the elastic seal will be better, which can protect the valve assembly and the valve seat, thereby increasing the service life of the valve assembly.

[0009] In one alternative embodiment, the contact portion is shaped like a frustum side surface, and the sealing portion is shaped like a frustum side surface.

[0010] In one optional embodiment, the elastic seal is provided with a connecting portion, the fixing portion is groove-shaped, and the connecting portion and the fixing portion are connected by an interference fit.

[0011] In one optional embodiment, a limiting groove is provided on the edge of the fixing part away from the sealing part, and a limiting protrusion is provided on the connecting part, wherein the limiting groove is adapted to accommodate the limiting protrusion.

[0012] In one alternative embodiment, the resilient seal protrudes from the contact portion.

[0013] In one alternative embodiment, the ratio of the radial dimension of the contact portion to the radial dimension of the sealing portion is 50%.

[0014] In one alternative embodiment, the ratio of the radial dimension of the sealing portion to the radial dimension of the contact portion is 50%.

[0015] In one alternative embodiment, the edge of the sealing portion that contacts the valve seat is provided with an angle.

[0016] Secondly, this application also provides a pump body, comprising: a pump body and a valve assembly as described in any embodiment of the first aspect, wherein the pump body is provided with at least one oil inlet and at least one oil outlet, and both the oil inlet and the oil outlet are provided with valve seats; the valve assembly cooperates with the valve seats.

[0017] Beneficial effects: Since the pump body includes a valve assembly, it has the same technical effects as the valve assembly, which will not be elaborated here.

[0018] Thirdly, this application also provides an engineering machine, including the aforementioned pump body.

[0019] Beneficial effects: Since engineering machinery includes pump bodies, it has the same technical effects as pump bodies, so it will not be elaborated here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of a valve assembly according to an embodiment of this application;

[0022] Figure 2 This is a cross-sectional view of another valve assembly according to an embodiment of this application;

[0023] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0024] Figure 4 This is a cross-sectional view of a pump body according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Valve assembly; 200. Pump body; 201. Pump body; 202. Valve seat; 203. Oil inlet; 204. Oil outlet;

[0027] 1. Valve body; 2. Elastic seal;

[0028] 11. Fixing part; 111. Limiting groove; 12. Contact part;

[0029] 21. Sealing part; 211. Angled angle; 22. Connecting part; 221. Limiting protrusion. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. The terms "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality can be, for example, a difference between the two equal items being less than or equal to 5% of either one. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In related technologies, the valve assembly is a key component in oil drilling equipment, commonly found in fracturing pumps, mud pumps, and other equipment. Its main function is to fit tightly with the valve box cone hole to achieve a sealing effect when closed, and to work in conjunction with the valve seat to complete the operation of fluid discharge (opening) and sealing (closing).

[0033] In oil and gas field development, fracturing is the main method for increasing oil and gas production. As a key component of fracturing equipment, the plunger pump provides power through the power end, driving the plunger to perform high-speed reciprocating linear motion, thereby driving the fracturing medium in the hydraulic end valve box (hydraulic end pump head) of the plunger pump to be drawn in and discharged to achieve pumping. The valve assembly and valve seat are key components as the fracturing medium intake and discharge channels. During the continuous intake and discharge of fracturing medium, the valve assembly opens and closes at high speed.

[0034] However, the valve assembly is equipped with valve rubber, and the valve assembly and the valve seat are subjected to high-speed reciprocating collisions during high-speed movement, resulting in a very short lifespan for the valve assembly, increasing the maintenance frequency and maintenance costs.

[0035] To address the aforementioned technical problems, this application provides a valve assembly, a pump body, and engineering machinery to solve or improve the issues of high maintenance frequency and high maintenance costs associated with valve assemblies.

[0036] The following is combined with Figures 1 to 4 This describes an embodiment of the present application.

[0037] According to embodiments of this application, in one aspect, a valve assembly 100 is provided, such as... Figures 1 to 3 As shown, it includes a valve body 1 and an elastic seal 2; the specific scheme is as follows.

[0038] like Figure 1 As shown, the valve body 1 is a metal part, such as composite steel, nickel-chromium alloy, etc., but it can also be made of non-metallic materials. The selection and setting can be made according to needs, such as... Figure 1 As shown, the valve body 1 is provided with a fixing part 11 and a contact part 12. The contact part 12 is used to contact the valve seat 202. The contact part 12 is annular, specifically, it can be a circular ring, an elliptical ring, or a polygonal ring, etc., preferably a circular ring.

[0039] like Figure 1 As shown, the elastic seal 2 is specifically a rubber seal, and the elastic seal 2 is disposed on the fixing part 11, such as... Figure 1 As shown, the elastic seal 2 is provided with a sealing part 21, which is annular. Specifically, it can be a circular annular, an elliptical annular, or a polygonal annular, preferably a circular annular. The sealing part 21 is used to contact the valve seat 202.

[0040] It should be noted that the sealing part 21 on the elastic seal 2 and the contact part 12 on the valve body 1 can be arranged adjacently or spaced apart. Preferably, the sealing part 21 on the elastic seal 2 and the contact part 12 on the valve body 1 can be arranged adjacently.

[0041] Among them, such as Figure 1As shown, the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50% to 70%. Specifically, it can be any one or any two values ​​among 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, and 70%. Preferably, the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50%, which optimizes the service life of the valve assembly 100 under low-pressure operating conditions.

[0042] Or, such as Figure 2 As shown, the ratio of the radial dimension of the sealing portion 21 to the radial dimension of the contact portion 12 is 50% to 70%. Specifically, it can be any one or any two of the following values: 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, and 70%. Preferably, the ratio of the radial dimension of the sealing portion 21 to the radial dimension of the contact portion 12 is 50%, which optimizes the service life of the valve assembly 100 under high-pressure operating conditions.

[0043] In specific usage, such as Figure 1 As shown, the valve assembly 100, in which the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50% to 70%, has a lower liquid supply frequency when the pump body 200 is in a low-pressure operating state. By increasing the proportion of the valve body 1, the overall weight of the valve assembly 100 is made heavier, which can reduce the impact force more and achieve a better sealing effect, thereby increasing the service life.

[0044] like Figure 2 As shown, in a valve assembly 100 where the ratio of the radial dimension of the sealing part 21 to the radial dimension of the contact part 12 is 50% to 70%, the fluid supply frequency of the main body will be higher when the main body is under high pressure. By increasing the contact ratio between the elastic seal 2 and the valve seat 202, the overall weight of the valve assembly 100 will be reduced, the impact force on the valve will be relatively reduced, and the buffering force provided by the elastic seal 2 will be better, which can protect the valve assembly 100 and the valve seat 202, thereby increasing the service life of the valve assembly 100.

[0045] In one embodiment, such as Figure 1 and 2As shown, the contact part 12 is shaped like the side of a frustum, and the sealing part 21 is shaped like the side of a frustum. That is, both the contact part 12 and the sealing part 21 are fan-shaped to make matching contact with the valve seat 202. The sealing performance of the elastic seal 2 can be increased by utilizing the matching surface that is in a contraction shape.

[0046] In one embodiment, such as Figure 3 As shown, the elastic seal 2 is provided with a connecting part 22 and the fixing part 11 is groove-shaped. The connecting part 22 and the fixing part 11 are connected by an interference fit, that is, the connecting part 22 on the elastic seal 2 and the fixing part 11 on the valve body 1 have a certain elastic pressure contact connection, which can improve the connection strength between the elastic seal 2 and the valve body 1, so as to prevent the deformation of the elastic seal 2 and thus improve its service life.

[0047] In one embodiment, such as Figure 3 As shown, a limiting groove 111 is provided on the edge of the fixing part 11 away from the sealing part 21, and a limiting protrusion 221 is provided on the connecting part 22. The limiting groove 111 is adapted to accommodate the limiting protrusion 221.

[0048] Specifically, both the limiting groove 111 and the limiting protrusion 221 are annular, and the cross-section of the limiting groove 111 can be semi-circular, semi-elliptical, polygonal, or other shapes.

[0049] In specific usage, such as Figure 3 As shown, since the limiting groove 111 is far from the sealing part 21, the sealing elastic element will deform under pressure during the contact between the sealing elastic element and the valve seat 202. The cooperation between the limiting groove 111 and the limiting protrusion 221 can reduce the deformation of the edge of the sealing elastic element away from the sealing part 21, thereby ensuring the stability of the cooperation between the sealing elastic element and the valve body 1 and improving the service life of the valve assembly 100.

[0050] In one embodiment, such as Figure 3 As shown, the elastic seal 2 protrudes from the contact portion 12, that is, along the direction perpendicular to the contact portion 12, the height of the elastic seal 2 is higher than the contact portion 12, which can increase the contact pressure between the elastic seal 2 and the valve seat 202 and improve the sealing effect.

[0051] In one embodiment, such as Figure 3 As shown, the edge of the sealing part 21 that contacts the valve seat 202 is provided with a chamfer 211. The size of the chamfer 211 can be selected and set according to the requirements. In this embodiment, the chamfer 211 can prevent the edge of the sealing part 21 from generating burrs due to continuous compression and friction with the mating part, thereby affecting the sealing performance of the elastic seal 2. Of course, the edge of the sealing part 21 that contacts the valve seat 202 can also be rounded.

[0052] According to embodiments of this application, in a second aspect, a pump body 200 is provided, such as... Figure 4 As shown, it includes: a pump body 201 and a valve assembly 100 in any embodiment of the first aspect. The pump body 201 is provided with at least one oil inlet 203 and at least one oil outlet 204. The oil inlet 203 is the oil supply port and the oil outlet 204 is the oil outlet.

[0053] like Figure 4 As shown, both the oil inlet 203 and the oil outlet 204 are provided with valve seats 202; the valve assembly 100 cooperates with the valve seat 202. It should be noted that there can be one or more oil inlets 203, one or more oil outlets 204, and one or more valve assemblies 100. Any one or more of the multiple oil inlets 203 and multiple oil outlets 204 can cooperate with the corresponding number of valve assemblies 100.

[0054] The pump body 200 can be a plunger pump or other pump with a valve assembly 100 and a valve seat 202 mating structure.

[0055] In this embodiment, since the pump body 200 includes the valve assembly 100 and has the same technical effects as the valve assembly 100, it will not be described in detail here.

[0056] Example 1

[0057] In this embodiment, such as Figure 4 As shown, the pump body 200 includes a pump body 201 and a valve assembly 100. The pump body 201 is provided with at least one oil inlet 203 and at least one oil outlet 204. A valve seat 202 is provided on both the oil inlet 203 and the oil outlet 204. The valve assembly 100 cooperates with the valve seat 202.

[0058] Among them, the valve assembly 100, such as Figures 1 to 3 As shown, it includes a valve body 1 and an elastic seal 2; the specific scheme is as follows.

[0059] like Figure 1 As shown, the valve body 1 is a metal part, such as composite steel, nickel-chromium alloy, etc., but it can also be made of non-metallic materials. The selection and setting can be made according to needs, such as... Figure 1 As shown, the valve body 1 is provided with a fixing part 11 and a contact part 12. The contact part 12 is used to contact the valve seat 202. The contact part 12 is annular, specifically, it can be a circular ring, an elliptical ring, or a polygonal ring, etc., preferably a circular ring.

[0060] like Figure 1 As shown, the elastic seal 2 is specifically a rubber seal, and the elastic seal 2 is disposed on the fixing part 11, such as... Figure 1As shown, the elastic seal 2 is provided with a sealing part 21, which is annular. Specifically, it can be a circular annular, an elliptical annular, or a polygonal annular, preferably a circular annular. The sealing part 21 is used to contact the valve seat 202.

[0061] The sealing portion 21 on the elastic seal 2 and the contact portion 12 on the valve body 1 can be arranged adjacent to each other.

[0062] Among them, such as Figure 1 As shown, the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50% to 70%. Specifically, it can be any one or any two values ​​among 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, and 70%. Preferably, the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50%, which optimizes the service life of the valve assembly 100 under low-pressure operating conditions.

[0063] Or, such as Figure 2 As shown, the ratio of the radial dimension of the sealing portion 21 to the radial dimension of the contact portion 12 is 50% to 70%. Specifically, it can be any one or any two of the following values: 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, and 70%. Preferably, the ratio of the radial dimension of the sealing portion 21 to the radial dimension of the contact portion 12 is 50%, which optimizes the service life of the valve assembly 100 under high-pressure operating conditions.

[0064] Furthermore, such as Figure 3 As shown, the elastic seal 2 is provided with a connecting part 22 and the fixing part 11 is groove-shaped. The connecting part 22 and the fixing part 11 are connected by an interference fit, that is, the connecting part 22 on the elastic seal 2 and the fixing part 11 on the valve body 1 have a certain elastic pressure contact connection, which can improve the connection strength between the elastic seal 2 and the valve body 1, so as to prevent the deformation of the elastic seal 2 and thus improve its service life.

[0065] Furthermore, such as Figure 3 As shown, a limiting groove 111 is provided on the edge of the fixing part 11 away from the sealing part 21, and a limiting protrusion 221 is provided on the connecting part 22. The limiting groove 111 is adapted to accommodate the limiting protrusion 221.

[0066] Specifically, both the limiting groove 111 and the limiting protrusion 221 are annular, and the cross-section of the limiting groove 111 can be semi-circular, semi-elliptical, polygonal, or other shapes.

[0067] Furthermore, such as Figure 3 As shown, the elastic seal 2 protrudes from the contact portion 12, that is, along the direction perpendicular to the contact portion 12, the height of the elastic seal 2 is higher than the contact portion 12, which can increase the contact pressure between the elastic seal 2 and the valve seat 202 and improve the sealing effect.

[0068] Furthermore, such as Figure 3 As shown, the sealing part 21 has an angled edge 211 on the edge that contacts the valve seat 202. The size of the angled edge 211 can be selected and set according to the requirements.

[0069] Test Example 1

[0070] The pump body 200 structure of Embodiment 1 is adopted, wherein the body is a plunger pump, and the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 50% to 70%.

[0071] ① In a low-pressure working environment (coalbed methane block), in a plunger pump, the ratio of the radial dimension of the contact portion 12 of the valve assembly 100 to the radial dimension of the sealing portion 21 is 50%, and the service life can reach 30-40 segments (i.e., 60 to 80 hours). Compared with the existing conventional valve assembly 100 (where the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 100%), which has a service life of 20-24 segments (i.e., 40 to 48 hours), its service life is increased by at least 25%.

[0072] ② In a low-pressure working environment (coalbed methane block), in a plunger pump, the ratio of the radial dimension of the contact portion 12 of the valve assembly 100 to the radial dimension of the sealing portion 21 is 70%, and the service life can reach 28-34 segments (i.e., 52 to 64 hours). Compared with the existing conventional valve assembly 100 (where the ratio of the radial dimension of the contact portion 12 to the radial dimension of the sealing portion 21 is 100%), which has a service life of 20-24 segments (i.e., 40 to 48 hours), its service life is increased by at least 20%.

[0073] Test Example 2

[0074] The pump body 200 structure of Embodiment 1 is adopted, wherein the body is a plunger pump, and the ratio of the radial dimension of the sealing part 21 to the radial dimension of the contact part 12 is 50% to 70%.

[0075] ① In high-pressure operating environments (shale gas blocks), in plunger pumps, the ratio of the radial dimension of the sealing part 21 of the valve assembly 100 to the radial dimension of the contact part 12 is 50%, and the service life can reach 10-12 segments (i.e., 20 to 24 hours). Compared with the existing conventional valve assembly 100 (where the ratio of the radial dimension of the contact part 12 to the radial dimension of the sealing part 21 is 100%), which has a service life of 6-8 segments (i.e., 12 to 16 hours), its service life is increased by at least 20%.

[0076] ② In high-pressure operating environments (shale gas blocks), in plunger pumps, the ratio of the radial dimension of the sealing part 21 of the valve assembly 100 to the radial dimension of the contact part 12 is 70%, and the service life can reach 9-10 segments (i.e., 18 to 20 hours). Compared with the existing conventional valve assembly 100 (where the ratio of the radial dimension of the contact part 12 to the radial dimension of the sealing part 21 is 100%), which has a service life of 6-8 segments (i.e., 12 to 16 hours), its service life is increased by at least 16%.

[0077] According to an embodiment of this application, in a third aspect, an engineering machine is provided, including the pump body 200 of the second aspect.

[0078] Specifically, engineering machinery refers to equipment with a pump body 200 and a valve assembly 100, such as oil drilling equipment.

[0079] In this embodiment, since the engineering machinery includes a pump body 200 and has the same technical effects as the pump body 200, it will not be described in detail here.

[0080] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A valve assembly, characterized in that, include: A valve body (1) is provided with a fixing part (11) and a contact part (12). The contact part (12) is used to contact the valve seat (202). The contact part (12) is annular. An elastic seal (2) is provided on the fixed part (11). The elastic seal (2) is provided with a sealing part (21). The sealing part (21) is annular and is used to contact the valve seat (202). Wherein, the ratio of the radial dimension of the contact portion (12) to the radial dimension of the sealing portion (21) is 50% to 70%, or the ratio of the radial dimension of the sealing portion (21) to the radial dimension of the contact portion (12) is 50% to 70%.

2. The valve assembly according to claim 1, characterized in that, The contact portion (12) is shaped like the side of a frustum, and the sealing portion (21) is shaped like the side of a frustum.

3. The valve assembly according to claim 1, characterized in that, The elastic seal (2) is provided with a connecting part (22), the fixing part (11) is groove-shaped, and the connecting part (22) is interference-fitted with the fixing part (11).

4. The valve assembly according to claim 3, characterized in that, A limiting groove (111) is provided on the edge of the fixing part (11) away from the sealing part (21), and a limiting protrusion (221) is provided on the connecting part (22). The limiting groove (111) is adapted to accommodate the limiting protrusion (221).

5. The valve assembly according to any one of claims 1 to 4, characterized in that, The elastic seal (2) protrudes from the contact portion (12).

6. The valve assembly according to any one of claims 1 to 4, characterized in that, The ratio of the radial dimension of the contact portion (12) to the radial dimension of the sealing portion (21) is 50%.

7. The valve assembly according to any one of claims 1 to 4, characterized in that, The ratio of the radial dimension of the sealing part (21) to the radial dimension of the contact part (12) is 50%.

8. The valve assembly according to any one of claims 1 to 4, characterized in that, The sealing part (21) has an angled edge (211) on the edge that contacts the valve seat (202).

9. A pump body, characterized in that, include: The pump body (201) is provided with at least one oil inlet (203) and at least one oil outlet (204), and both the oil inlet (203) and the oil outlet (204) are provided with valve seats (202); At least one valve assembly (100) as described in any one of claims 1 to 8, the valve assembly (100) cooperating with the valve seat (202).

10. An engineering machinery, characterized in that, Includes the pump body (200) as described in claim 9.

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