A valve assembly for a reciprocating double-acting pump

Abstract

This invention provides a valve assembly for a reciprocating double-acting pump, belonging to the field of reciprocating pump technology. It includes a pump body and a piston, with a valve assembly unit at each end of the pump body. Each valve assembly unit includes a discharge valve assembly and a suction valve assembly arranged in a coordinated manner. When the piston moves to one end, the discharge valve assembly in that end opens and the suction valve assembly closes, while the discharge valve assembly in the other end closes and the suction valve assembly opens. The sealing surfaces of both the discharge and suction valve assemblies use internal conical surface contact. This invention achieves continuous pumping, more uniform discharge, and significantly improves the working efficiency of the reciprocating pump. The sealing surfaces of the discharge and suction valve assemblies are sealed by internal conical surfaces. Even if the unidirectional valve body slightly shifts, the internal conical surface will compensate for the seal, resulting in excellent sealing performance and extending the pump's service life. The internal conical surface structure automatically corrects its position through inclined surface contact during valve body movement, achieving "dynamic guidance."

Description

Technical Field

[0001] This utility model relates to the field of reciprocating pump technology, and in particular to a valve assembly for a reciprocating double-acting pump. Background Technology

[0002] Reciprocating pumps are crucial equipment in oil and gas field development, often handling gas-liquid mixtures. These media are unevenly distributed and frequently contain impurities, posing a significant challenge to the sealing reliability of pumps and valves. Conventional reciprocating pump valve assemblies typically employ spring-loaded plate or ball check valves, with the valve core and seat often forming a planar contact seal. While this structure performs adequately when transporting pure liquids, its drawbacks are significant in gas-liquid mixed transport conditions such as oil and gas field development and chemical production. Gases and solid particles entrained in the medium can easily cause valve body misalignment or jamming during opening and closing, disrupting the effective seal and leading to internal leakage or valve seat erosion, ultimately resulting in decreased pump efficiency or even pump failure. Furthermore, the complex structure and cumbersome assembly and disassembly increase equipment maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a valve assembly for a reciprocating double-acting pump. By using internal conical surface contact for the sealing surfaces of the discharge valve assembly and the suction valve assembly at both ends of the pump body, the pump achieves continuous and efficient operation and high reliability under complex media.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a valve assembly for a reciprocating double-acting pump, comprising a pump body and a piston, wherein the piston reciprocates within the pump body, and a valve assembly unit is provided at each end of the pump body;

[0005] The valve group unit includes a discharge valve group and a suction valve group that are configured in concert.

[0006] When the piston moves to one end, the discharge valve group in the valve group unit at that end opens and the suction valve group closes, while the discharge valve group in the valve group unit at the other end closes and the suction valve group opens.

[0007] The sealing surfaces of both the discharge valve assembly and the suction valve assembly are made of inner conical surfaces.

[0008] As an improvement of this utility model, the discharge valve assembly includes:

[0009] Valve seat I is mounted on the pump body and has an inner conical sealing surface and a valve body guide hole I.

[0010] Valve body I, with a guide post at the lower part that mates with the guide hole I, a sealing element in the middle part that matches the inner conical sealing surface, and a spring mounting part at the upper part;

[0011] The gland I is detachably connected to the pump body. One end of the gland I presses and fixes the valve seat I, and the other end is connected to the discharge manifold.

[0012] Spring support seat I is installed inside the pressure cover I, and a spring mounting part is provided at its lower part;

[0013] Spring I has its two ends respectively fitted onto the spring mounting part of valve body I and the spring mounting part of spring support seat I.

[0014] As an improvement of this utility model, a clamping ring is provided between the pressure cap I and the valve seat I.

[0015] As an improvement of this utility model, the pump body is provided with a tapered hole I for installing valve seat I, and at least one sealing element I is provided between the pressure cover I and the pump body.

[0016] As an improvement of this utility model, the cross-sectional shape of the guide post is a straight line, a Y-shape, or a cross shape, and a flow guiding channel is provided between it and the valve body guide hole I.

[0017] As an improvement of this utility model, the spring support seat I has at least two fluid discharge holes evenly distributed along the circumferential direction.

[0018] As an improvement of this utility model, the inhalation valve assembly includes:

[0019] Gland II is detachably connected to the pump body. Its side facing the inner cavity of the pump body has an inner conical sealing surface and a flow passage hole in the center.

[0020] Valve body II has a guide post at its lower part that mates with the flow hole, a sealing element in its middle part that matches the inner conical sealing surface, and a spring mounting part at its upper part.

[0021] Spring support seat II is installed on the pump body, and a spring mounting part is provided at its lower part;

[0022] Spring II has its two ends respectively fitted onto the spring mounting part of valve body II and the spring mounting part of spring support seat II.

[0023] As an improvement of this utility model, the cross-sectional shape of the guide post is a straight line, a Y-shape, or a cross shape, and a flow guiding channel is provided between it and the flow hole.

[0024] As an improvement of this utility model, the spring support seat II has at least two fluid intake holes evenly distributed along the circumferential direction.

[0025] As an improvement of this utility model, the sealing element is integrally vulcanized with valve body I and valve body II.

[0026] The beneficial effects of this utility model are as follows: This utility model discloses a valve assembly for a reciprocating double-acting pump. By setting a valve assembly unit at each end of the pump body, during the reciprocating motion of the piston, the pump body always has one set of discharge valve assembly in the discharge state and simultaneously has one set of suction valve assembly in the suction state, realizing continuous pumping, more uniform discharge, and greatly improving the working efficiency of the reciprocating pump. The sealing surfaces of the discharge valve assembly and the suction valve assembly are sealed by an inner conical surface. Due to the contact design of the inner conical surface, even if the unidirectional valve body is slightly offset, the inner conical surface will compensate for the seal, resulting in excellent sealing effect and extending the service life of the pump. The inner conical surface structure automatically corrects its position through inclined surface contact during valve body movement, realizing "dynamic guidance".

[0027] Furthermore, the discharge valve assembly includes: a valve seat I, mounted on the pump body, having an inner conical sealing surface and a valve body guide hole I; a valve body I, having a guide post at its lower part that mates with the guide hole I, a sealing element in its middle part that matches the inner conical sealing surface, and a spring mounting part at its upper part; a pressure cap I, detachably connected to the pump body, one end of which presses and fixes the valve seat I, and the other end of which connects to the discharge manifold; a spring support seat I, installed inside the pressure cap I, having a spring mounting part at its lower part; and a spring I, with both ends respectively fitted onto the spring mounting parts of the valve body I and the spring mounting parts of the spring support seat I. Through the cooperation between the guide post at the lower part of the valve body I and the valve body guide hole I on the valve seat I, in addition to preventing the valve body I from shifting during movement, it also works with the inner conical sealing surface to ensure the centering of the valve body movement and the effectiveness of the sealing surface. This is particularly suitable for complex working conditions such as gas-liquid mixing and impurities, greatly extending the valve assembly's lifespan, and featuring a simple structure. By detachably connecting the gland I to the pump body, valve assembly maintenance and parts replacement can be performed without extensive disassembly of the pump body, saving maintenance time and costs and greatly improving loading and unloading efficiency.

[0028] Furthermore, a clamping ring is provided between the gland I and the valve seat I, and the gland I clamps the valve seat I tightly through the clamping ring. By providing the clamping ring, the overall length of the gland I can be reduced, which facilitates processing and manufacturing.

[0029] Furthermore, the pump body is provided with a tapered hole I for installing valve seat I, and at least one sealing element I is provided between the gland I and the pump body. The tapered hole I serves as a guide during valve seat I installation, ensuring a more secure installation of valve seat I on the pump body. This design is simple, quick to install and remove, and structurally stable and reliable.

[0030] Furthermore, the guide post has a cross-sectional shape of I-shaped, Y-shaped, or cross-shaped, and a flow guiding channel is provided between it and the valve body guide hole I. Through the cooperation between the guide post and the valve body guide hole I, the movement trajectory of the valve body can be effectively constrained, preventing radial deviation or tilting during opening and closing. Its combined action with the inner conical sealing surface avoids poor sealing and local wear caused by valve body misalignment. Moreover, the flow guiding channel facilitates the discharge of fluid from the pump body. The structure is simple, easy to process, and low in cost.

[0031] Furthermore, at least two fluid discharge holes are evenly distributed along the circumference of the spring support seat I. The fluid inside the discharge valve assembly is discharged through the fluid discharge holes and the internal channel of the gland I, resulting in a simple structure and easy manufacturing.

[0032] Furthermore, the suction valve assembly includes: a gland II, detachably connected to the pump body, with an inner conical sealing surface on its side facing the pump body cavity and a flow passage hole at its center; a valve body II, with a guide post at its lower part that mates with the flow passage hole, a sealing element in its middle part that matches the inner conical sealing surface, and a spring mounting part at its upper part; a spring support seat II, mounted on the pump body, with a spring mounting part at its lower part; and a spring II, with its two ends respectively fitted onto the spring mounting parts of the valve body II and the spring mounting parts of the spring support seat II. Through the cooperation between the guide post at the lower part of the valve body II and the flow passage hole on the gland II, in addition to preventing the valve body II from shifting during movement, it also works with the inner conical sealing surface to ensure the centering of the valve body movement and the effectiveness of the sealing surface. This is particularly suitable for complex working conditions such as gas-liquid mixing and impurities, greatly extending the valve assembly's lifespan, and featuring a simple structure. By detachably connecting the gland II to the pump body, valve assembly maintenance and parts replacement can be performed without extensive disassembly of the pump body, saving maintenance time and costs and greatly improving loading and unloading efficiency.

[0033] Furthermore, the guide post has a cross-sectional shape of I-shaped, Y-shaped, or cross-shaped, and a flow guiding channel is provided between it and the flow passage. Through the cooperation between the guide post and the flow passage on the pressure plate II, the movement trajectory of the valve body can be effectively constrained, preventing radial deviation or tilting during opening and closing. Under the combined action of the guide post and the inner conical sealing surface, it avoids poor sealing and local wear caused by valve body tilting. Moreover, the flow guiding channel facilitates the flow of external fluid into the pump body. The structure is simple, easy to process, and low in cost.

[0034] Furthermore, the spring support seat II has at least two fluid suction holes evenly distributed along the circumference. Fluid outside the suction valve assembly flows into the pump body through these suction holes, resulting in a simple structure and easy manufacturing.

[0035] Furthermore, the seal is integrally vulcanized with valve body I and valve body II. By integrally vulcanizing the seal with valve body I and valve body II, the seal is less likely to detach during overall operation, ensuring structural stability. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0037] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0038] Figure 3 This is a schematic diagram of the structure of valve body I in Embodiment 1 of this utility model;

[0039] Figure 4 for Figure 3 A bottom view;

[0040] Figure 5 for Figure 1 A magnified view of part B in the diagram;

[0041] Figure 6 This is a schematic diagram of the structure of valve body I in Embodiment 2 of this utility model.

[0042] In the diagram, 1. Pump body; 2. Discharge valve assembly; 21. Gland I; 22. Transition channel I; 23. Spring support seat I; 231. Fluid discharge hole; 24. Spring I; 25. Fluid channel I; 26. Compression ring; 27. Valve body I; 271. Spring mounting part; 272. Spring limiting groove; 273. Guide column; 274. Seal I; 275. Flow guide channel; 28. Tapered hole I; 29. ​​Valve body guide hole I; 2A. Valve seat I; 2B. Sealing ring I; 3. Suction valve assembly; 31. Spring support seat II; 311. Fluid suction hole; 32. Transition channel II; 33. Spring II; 34. Valve body II; 35. Gland II; 36. Flow hole; 37. Seal II; 38. Fluid channel II; 4. Piston. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0044] It should be noted that the directional terms such as upper, lower, inner, outer, upper part, middle part, and lower part used in the embodiments of this utility model are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive. Example

[0045] like Figure 1 As shown, a valve assembly for a reciprocating double-acting pump includes a pump body 1 and a piston 4. The piston 4 reciprocates within the pump body 1. A valve assembly unit is provided at each end of the pump body 1. Each valve assembly unit includes a discharge valve assembly 2 and a suction valve assembly 3 arranged in a coordinated manner. When the piston 4 moves to one end, the discharge valve assembly 2 in the valve assembly unit at that end opens and the suction valve assembly 3 closes. In the valve assembly unit at the other end, the discharge valve assembly 2 closes and the suction valve assembly 3 opens. The sealing surfaces of the discharge valve assembly 2 and the suction valve assembly 3 are both in internal conical contact, and the discharge flow direction of the discharge valve assembly 2 and the inlet flow direction of the suction valve assembly 3 are both perpendicular to the reciprocating motion direction of the piston.

[0046] like Figure 2 , Figure 3 and Figure 4 As shown, the discharge valve assembly 2 includes: a valve seat I2A, mounted on the pump body 1, having an inner conical sealing surface and a valve body guide hole I29; a valve body I27, having a guide post 273 at its lower part that mates with the guide hole I29, a sealing element 274 in its middle part that matches the inner conical sealing surface, and a spring mounting part 271 at its upper part; a pressure cap I21, detachably connected to the pump body 1, one end of which presses and fixes the valve seat I2A, and the other end of which is connected to the discharge manifold, preferably the pressure cap I21 is bolted to the pump body 1; a spring support seat I23, installed inside the pressure cap I21, having a spring mounting part at its lower part; and a spring I24, with both ends respectively fitted into the spring mounting parts 271 of the valve body I27 and the spring mounting parts of the spring support seat I23. Preferably, the spring mounting part 271 is an upwardly protruding columnar structure, with a spring limiting groove 272 at its root for limiting the offset of the spring I24.

[0047] Preferably, in order to reduce the overall length of the gland I21 and facilitate its processing and manufacturing, a clamping ring 26 is provided between the gland I21 and the valve seat I2A.

[0048] Preferably, the pump body 1 has a tapered hole I28 at the outlet of the flow channel for installing the valve seat I2A. The lower outer surface of the valve seat I2A is a tapered surface that matches the tapered hole I28. The tapered hole I28, in addition to its guiding function, ensures that the valve seat I2A is more securely installed on the pump body 1 during installation. This design is simple, quick to install and remove, and structurally stable and reliable. At least one sealing element I2B is provided between the gland I21 and the pump body 1. Preferably, this sealing element I2B is an O-ring.

[0049] Preferably, the guide post 273 has a cross-sectional shape such as a straight line, a Y-shape, or a cross shape, and a flow guiding channel 275 is provided between it and the valve body guide hole I29. In this embodiment, the guide post 273 has a cross-shaped cross-section. Through the cooperation between the guide post 273 and the valve body guide hole I29, the movement trajectory of the valve body I27 can be effectively constrained, preventing it from radially deviating or tilting during opening and closing. Under the combined action of the guide post 273 and the inner conical sealing surface, it avoids poor sealing and local wear caused by the misalignment of the valve body I27. Furthermore, the flow guiding channel 275 facilitates the discharge of fluid from the pump body 1. The structure is simple, easy to process, and low in cost.

[0050] Preferably, the spring support seat I23 has at least two fluid discharge holes 231 evenly distributed along the circumference. The pressure cap I21 above the spring support seat I23 has a transition channel I22 inside, which communicates with the internal channel of the pressure cap I21 above it.

[0051] Preferably, the seal 274 and the valve body I27 are integrally vulcanized. By integrally vulcanizing the seal 274 and the valve body I27, the seal 274 is less likely to fall off during overall operation, and the structure is stable. The lower part of the seal 274 is a conical surface that matches the inner conical sealing surface of the valve seat I2A.

[0052] like Figure 5 As shown, the suction valve assembly 3 includes: a pressure cap II 35, detachably connected to the pump body 1, with an inner conical sealing surface on the side facing the inner cavity of the pump body 1, and a flow passage hole 36 at its center; a valve body II 34, with a guide post at its lower part that mates with the flow passage hole 36, a sealing element in its middle part that matches the inner conical sealing surface, and a spring mounting part at its upper part; a spring support seat II 31, mounted on the pump body 1, with a spring mounting part at its lower part; and a spring II 33, with both ends respectively fitted onto the spring mounting parts of the valve body II 34 and the spring mounting parts of the spring support seat II 31. Preferably, the spring mounting part is an upwardly protruding columnar structure, with a spring limiting groove at its root for limiting the offset of the spring II 33. At least one sealing element II 37 is provided between the pressure cap II 35 and the pump body 1, preferably, the sealing element II 37 is an O-ring. It should be noted that the valve body II 34 in the intake valve assembly 3 and the valve body I 27 in the discharge valve assembly 2 have the same structure, so they will not be described in detail here.

[0053] Preferably, the seal and valve body II34 are integrally vulcanized. By integrally vulcanizing the seal and valve body II34, the seal is less likely to fall off during operation, ensuring structural stability. The lower part of the seal is a conical surface that matches the inner conical sealing surface of the gland II35.

[0054] Preferably, the guide post has a cross-sectional shape such as a straight line, a Y-shape, or a cross shape, and a flow guiding channel is provided between it and the aforementioned flow passage 36. In this embodiment, the guide post has a cross-shaped cross-section. Through the cooperation between the guide post and the flow passage 36, the movement trajectory of the valve body II 34 can be effectively constrained, preventing it from radially deviating or tilting during opening and closing. Its combined action with the inner conical sealing surface avoids poor sealing and localized wear caused by the misalignment of the valve body II 34. Furthermore, the flow guiding channel facilitates the intake of fluid from outside the pump body 1. The structure is simple, easy to manufacture, and low in cost.

[0055] Preferably, at least two fluid intake holes 311 are evenly distributed along the circumference of the spring support seat II 31. A transition channel II 32 is provided at the pump body 1 intake port above the spring support seat II 31, and the transition channel II 32 communicates with the piston chamber inside the pump body 1.

[0056] Preferably, the seal and valve body II34 are integrally vulcanized. By integrally vulcanizing the seal and valve body II34, the seal is less likely to fall off during operation, ensuring structural stability. The lower part of the seal is a conical surface that matches the inner conical sealing surface of the gland II35.

[0057] The working principle of this utility model is as follows: When piston 4 moves to the right, the volume of its right chamber decreases and the pressure increases. Valve body I27 in the right-side discharge valve assembly 2 moves upward against the preload force of spring I24. The guide post at the bottom of valve body I27 rises vertically along the valve body guide hole I29 of valve seat I2A, ensuring that it does not deviate radially. Finally, the fluid is discharged sequentially through the conical hole I28, the valve body guide hole I29, the guide channel 275, the fluid channel I25 between valve seat I2A and spring support seat I23, the fluid discharge hole 231, the transition channel I22, and the flow hole above the transition channel I22. The discharge valve assembly 2 is in the open state. At the same time, under the combined action of spring II33 and chamber pressure, valve body II34 in the right-side suction valve assembly 3 is pressed more tightly against the inner conical sealing surface of the pressure cap II35. The suction valve assembly 3 is closed, completing the fluid discharge process.

[0058] Simultaneously, the volume of the left chamber of the piston increases, creating a negative pressure. Valve body II 34 in the left-side suction valve assembly 3 moves upward against the preload force of spring II 33. The guide post at the bottom of valve body II 34 rises vertically along the flow hole 36 of the gland II 35, ensuring no radial displacement. Ultimately, fluid from outside the pump body 1 is drawn into the pump body 1 through the flow hole 36, the guide channel, the fluid channel II 38 between the gland II 35 and the spring support II 31, the fluid suction hole 311, and the transition channel II 32, thus opening the suction valve assembly 3. Simultaneously, valve body I 27 in the left-side discharge valve assembly 2 is pressed against the inner conical sealing surface of valve seat I 2A under the combined action of spring I 24 and the negative pressure in the chamber, closing the discharge valve assembly 2 and completing the fluid suction process.

[0059] When piston 4 moves to the left, the volume of its left chamber decreases, and the pressure increases. This process is exactly the same as the "fluid discharge process" described above, only occurring on the left side. The left discharge valve group 2 is open, and the left suction valve group 3 is closed, allowing the medium to be discharged. Simultaneously, the volume of its right chamber increases, creating a negative pressure. This process is exactly the same as the "fluid suction process" described above, only occurring on the left side. The right suction valve group 3 is open, and the right discharge valve group 2 is closed.

[0060] In summary, this utility model, by setting a valve group unit at each end of the pump body 1, ensures that during the reciprocating motion of the piston, one set of discharge valve group 2 is always in the discharge state, and simultaneously one set of suction valve group 3 is in the suction state. This achieves continuous pumping, more uniform discharge, and significantly improves the working efficiency of the reciprocating pump. The sealing surfaces of the discharge valve group 2 and the suction valve group 3 are sealed by an inner conical surface. Due to the contact design of the inner conical surface, even if the unidirectional valve body is slightly offset, the inner conical surface will compensate for the seal, resulting in excellent sealing performance and extending the service life of the pump. The inner conical surface structure automatically corrects its position through inclined surface contact during valve body movement, achieving "dynamic guidance." Example

[0061] like Figure 6 As shown, the difference between this embodiment and embodiment one is that the guide post 273 of the valve body I 27 in this embodiment is Y-shaped. Compared with embodiment one, in addition to saving materials, it also makes the flow channel 275 larger, which is more convenient for fluid flow.

[0062] The above provides a detailed description of a valve assembly for a reciprocating double-acting pump provided by this utility model. Specific examples have been used to illustrate the technical principles and implementation methods of this utility model. The above embodiments are only used to help understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A valve train for a reciprocating double acting pump comprising a pump body and a piston which reciprocates within the pump body characterised in that: A valve assembly unit is provided at each of the two ends of the pump body; The valve group unit includes a discharge valve group and a suction valve group that are configured in concert. When the piston moves to one end, the discharge valve group in the valve group unit at that end opens and the suction valve group closes, while the discharge valve group in the valve group unit at the other end closes and the suction valve group opens. The sealing surfaces of both the discharge valve assembly and the suction valve assembly are made of inner conical surfaces.

2. A valve assembly for a reciprocating double-acting pump according to claim 1, characterized in that: The discharge valve assembly includes: Valve seat I is mounted on the pump body and has an inner conical sealing surface and a valve body guide hole I. Valve body I, with a guide post at the lower part that mates with the guide hole I, a sealing element in the middle part that matches the inner conical sealing surface, and a spring mounting part at the upper part; The gland I is detachably connected to the pump body. One end of the gland I presses and fixes the valve seat I, and the other end is connected to the discharge manifold. Spring support seat I is installed inside the pressure cover I, and a spring mounting part is provided at its lower part; Spring I has its two ends respectively fitted onto the spring mounting part of valve body I and the spring mounting part of spring support seat I.

3. A valve assembly for a reciprocating double-acting pump according to claim 2, characterized in that: A clamping ring is provided between the gland I and the valve seat I.

4. A valve assembly for a reciprocating double-acting pump according to claim 2, characterized in that: The pump body is provided with a tapered hole I for installing valve seat I, and at least one sealing element I is provided between the gland I and the pump body.

5. A valve assembly for a reciprocating double-acting pump according to claim 2, characterized in that: The cross-sectional shape of the guide post is I-shaped, Y-shaped, or cross-shaped, and a flow guiding channel is provided between it and the valve body guide hole I.

6. A valve assembly for a reciprocating double-acting pump according to claim 2, characterized in that: The spring support seat I has at least two fluid discharge holes evenly distributed along the circumference.

7. A valve assembly for a reciprocating double-acting pump according to claim 1, characterized in that: The inhalation valve assembly includes: Gland II is detachably connected to the pump body. Its side facing the inner cavity of the pump body has an inner conical sealing surface and a flow passage hole in the center. Valve body II has a guide post at its lower part that mates with the flow hole, a sealing element in its middle part that matches the inner conical sealing surface, and a spring mounting part at its upper part. Spring support seat II is installed on the pump body, and a spring mounting part is provided at its lower part; Spring II has its two ends respectively fitted onto the spring mounting part of valve body II and the spring mounting part of spring support seat II.

8. A valve assembly for a reciprocating double-acting pump according to claim 7, characterized in that: The cross-sectional shape of the guide post is straight, Y-shaped, or cross-shaped, and a flow channel is provided between it and the flow hole.

9. A valve assembly for a reciprocating double-acting pump according to claim 7, characterized in that: The spring support seat II has at least two fluid intake holes evenly distributed along the circumference.

10. A valve assembly for a reciprocating double-acting pump according to claim 2 or 7, characterized in that: The sealing element is integrally vulcanized with valve body I and valve body II.

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