Valve assembly for a plunger pump and plunger pump

Abstract

This invention relates to the field of oil and gas development, and discloses a valve assembly for a plunger pump and a plunger pump. The valve assembly includes: a valve body having an intake port and an exhaust port; two valve cores, respectively configured to move to a position opening the intake port when the plunger pump is in an intake state, and to a position opening the exhaust port when the plunger pump is in an exhaust state; two springs, respectively configured to return the two valve cores to their initial positions; and two spring seats that respectively cooperate with the two springs, each spring seat having a receiving cavity for receiving the valve cores and springs, the wall of the receiving cavity forming a protruding limiting portion, the limiting portion being used to limit the movement distance of the valve cores, thereby limiting the degree of spring compression. This invention can avoid excessive compression of the springs to prevent friction between the springs themselves, thereby reducing the risk of spring damage and improving the service life of the plunger pump valve assembly.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development technology, and specifically to a valve assembly and a plunger pump for use in a plunger pump. Background Technology

[0002] Currently, most high-pressure water injection pumps used in oilfield water injection systems are reciprocating plunger pumps. Reciprocating plunger pumps achieve liquid intake and discharge by periodically changing the volume of the pump cylinder through the reciprocating motion of the plunger within the cylinder. When the plunger moves backward, the volume within the pump chamber increases, creating a partial vacuum. At this time, the intake valve opens under the pressure difference, and liquid is drawn into the pump chamber. When the plunger moves forward, the volume within the pump chamber decreases, and the liquid is compressed. When the pressure exceeds the spring pressure of the discharge valve and the pipeline resistance, the discharge valve opens, and the liquid is discharged from the pump chamber.

[0003] However, the return spring inside the hydraulic cylinder of a reciprocating plunger pump is prone to damage. If the return spring breaks, the discharge or suction valve may not reset promptly, leading to reduced pump efficiency and increased resistance at the power end. Especially if this increased resistance is not addressed in time, it can cause the crankshaft bearings to overheat, burn out, or wear, increasing maintenance costs.

[0004] Therefore, existing technologies still need improvement. Summary of the Invention

[0005] The main objective of this invention is to provide a valve assembly and a plunger pump for a plunger pump, so as to solve the technical problem that the valve plate return spring of the plunger pump is easily damaged.

[0006] According to one aspect of the present invention, a valve assembly for a plunger pump is provided, comprising: The valve body has an intake port and an exhaust port; The two valve cores are respectively configured to move to the position of opening the suction port when the plunger pump is in the suction state, and to move to the position of opening the discharge port when the plunger pump is in the discharge state; Two springs are configured to return the two valve cores to their initial positions. Two spring seats that cooperate with two springs respectively, each spring seat has a receiving cavity for receiving the valve core and the spring, the wall of the receiving cavity forming a protruding limiting part, the limiting part is used to limit the movement distance of the valve core, thereby limiting the degree of spring compression.

[0007] According to one embodiment of the present invention, the two ends of the spring are fixed to the valve core and the spring seat respectively, and there is a gap between the body of the spring and the circumferential wall of the receiving cavity.

[0008] According to one embodiment of the present invention, the receiving cavity has a retractable portion, and the end of the spring is engaged in the retractable portion.

[0009] According to one embodiment of the present invention, the valve core has a boss, and the end of the spring is tightly fitted onto the boss.

[0010] According to one embodiment of the present invention, the spring is a single-layer spring.

[0011] According to one embodiment of the present invention, the discharge port axially penetrates the valve body, the valve body forms an enlarged end, and the suction port penetrates the enlarged end; the two valve cores include a suction valve core and a discharge valve core, the suction valve core and the discharge valve core are respectively disposed on both sides of the valve body, the suction valve core is annular and has a central hole communicating with the discharge port; When the plunger pump is in the suction state, the suction valve core moves along the first axial direction under the push of the fluid to open the suction port, so that the fluid is drawn into the plunger pump through the suction port; When the plunger pump is in the discharge state, the suction valve core moves along the second axial direction under the pressure of the fluid to close the suction port, and the discharge valve core moves along the second axial direction under the pressure of the fluid to open the discharge port, so that the suction fluid is discharged to the outside of the plunger pump through the central hole and the discharge port.

[0012] According to one embodiment of the present invention, the two spring seats include a first spring seat corresponding to the suction valve core and a second spring seat corresponding to the discharge valve core. The first spring seat is configured to be fixedly connected to the housing of the plunger pump, and the second spring seat is fixedly connected to the valve body.

[0013] According to one embodiment of the present invention, the first spring seat has a flange and a connecting hole on the flange, and the first spring seat is fixedly connected to the outer shell through the connecting hole; the valve body has an external thread, and the second spring seat has an internal thread that mates with the external thread.

[0014] According to one embodiment of the invention, the second spring seat has an operating engagement portion for engaging with an external operating member, such that the external operating member can remove the valve assembly at least partially from the housing of the plunger pump.

[0015] According to one embodiment of the present invention, the spring seat is provided with a fluid flow hole.

[0016] According to another aspect of the present invention, a plunger pump is provided, comprising: shell; A plunger is disposed within the housing and configured to reciprocate within the housing to switch the plunger pump between a suction state and a discharge state; The valve assembly described above is housed within the housing.

[0017] In the technical solution of the present invention, the spring seat has a receiving cavity for receiving the valve core and the spring. The wall of the receiving cavity forms a protruding limiting part, which is used to limit the movement distance of the valve core and thus limit the degree of compression of the spring. The present invention avoids excessive compression of the spring to avoid friction between the springs themselves, thereby reducing the risk of spring damage and improving the service life of the plunger pump valve assembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a valve assembly for a plunger pump according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a second spring seat according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a first spring seat according to an embodiment of the present invention is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0022] As mentioned in the background section above, the inventors of this application discovered that the valve plate return spring of a plunger pump is prone to damage. The inventors realized that the main reason for return spring breakage is the lack of a limiting structure for the return spring, leading to excessive compression and wear due to friction between the springs themselves, ultimately causing spring breakage. Furthermore, in some prior art solutions, the return spring of the drain valve plate is designed with two sets of springs, i.e., a double-layer spring configuration with inner and outer springs. This requires careful installation by experienced operators; even slight carelessness can cause the inner and outer springs to rub against each other, resulting in spring breakage. To solve the above problems in the prior art, the inventors of this application provide, in one or more embodiments, a valve assembly for a plunger pump and a plunger pump including the valve assembly.

[0023] refer to Figures 1 to 3 This application proposes a valve assembly 100 for a plunger pump, comprising: a valve body 110 having a suction port 112 and a discharge port 114; two valve cores respectively configured to move to a position opening the suction port 112 when the plunger pump is in a suction state, and to a position opening the discharge port 114 when the plunger pump is in a discharge state; two springs respectively configured to return the two valve cores to their initial positions; and two spring seats respectively cooperating with the two springs, each spring seat having a receiving cavity for receiving the valve cores and the springs, the wall of the receiving cavity forming a protruding limiting portion for limiting the movement distance of the valve cores thereby limiting the degree of spring compression.

[0024] The pump comprises two valve cores: an intake valve core 120 and an exhaust valve core 130. The intake valve core 120 is configured to move to the position where the intake port 112 is open when the plunger pump is in the intake state, and the exhaust valve core 130 is configured to move to the position where the exhaust port 114 is open when the plunger pump is in the exhaust state. Two springs include a first spring 140 corresponding to the intake valve core 120 and a second spring 150 corresponding to the exhaust valve core 130. Two spring seats include a first spring seat 160 corresponding to the intake valve core 120 and a second spring seat 170 corresponding to the exhaust valve core 130. The intake valve core 120, the first spring 140, and the first spring seat 160 cooperate, with the first spring 140 configured to return the intake valve core 120 to its initial position (which can be the closed position with the intake port 112 closed). The exhaust valve core 130, the second spring 150, and the second spring seat 170 cooperate, with the second spring 150 configured to return the exhaust valve core 130 to its initial position (which can be the closed position with the exhaust port 114 closed).

[0025] The first spring seat 160 has a receiving cavity 162 for receiving the intake valve core 120 and the first spring 140. The wall of the receiving cavity 162 forms a protruding limiting portion 164, which limits the movement distance of the intake valve core 120, thereby limiting the compression degree of the first spring 140. The limiting portion 164 can be a stepped structure. When the intake valve core 120 moves in a direction away from the valve body 110 to abut against the limiting portion 164, the limiting portion 164 restricts the intake valve core 120, preventing it from continuing to move and further compressing the first spring 140. Similarly, the second spring seat 170 has a receiving cavity 172 for receiving the discharge valve core 130 and the second spring 150. The wall of the receiving cavity 172 forms a protruding limiting portion 174, which limits the movement distance of the discharge valve core 130, thereby limiting the compression degree of the second spring 150. The limiting portion 174 can be a stepped structure. The first spring seat 160 and the second spring seat 170 can be cylindrical structures, with corresponding receiving cavities 162 and 172 formed inside.

[0026] In embodiments of the present invention, the spring seat has a receiving cavity for receiving the valve core and the spring. The wall of the receiving cavity forms a protruding limiting portion, which limits the movement distance of the valve core, thereby limiting the degree of spring compression. The present invention reduces the risk of spring damage and improves the service life of the plunger pump valve assembly by avoiding excessive spring compression and thus preventing friction between the springs themselves. Furthermore, the receiving cavity provides good guidance for the spring and valve core, ensuring smooth spring contraction and smooth valve core movement. Stable and standardized valve core movement reduces abnormal forces on the spring, thereby reducing spring damage.

[0027] In some embodiments, the two ends of the spring are fixed to the valve core and the spring seat, respectively, and there is a gap between the body of the spring and the circumferential wall of the receiving cavity. Specifically, the two ends of the first spring 140 are fixed to the suction valve core 120 and the first spring seat 160, respectively, and there is a gap between the body of the first spring 140 (the body of the first spring 140 can be the area of ​​the first spring 140 excluding the two ends) and the circumferential wall of the receiving cavity 162. The two ends of the second spring 150 are fixed to the discharge valve core 130 and the second spring seat 170, respectively, and there is a gap between the body of the second spring 150 and the circumferential wall of the receiving cavity 172. By fixing the two ends of the spring to the valve core and the spring seat, the spring is securely installed and will not slip; at the same time, by forming a gap between the body of the spring and the circumferential wall of the receiving cavity, friction between the spring and the wall of the receiving cavity is avoided, further reducing the possibility of spring damage.

[0028] In some embodiments, the receiving cavity has a contraction portion, and the end of the spring is engaged in the contraction portion. Specifically, the receiving cavity 162 has a contraction portion 166, and the end of the first spring 140 is engaged in the contraction portion 166. The receiving cavity 172 has a contraction portion 176, and the end of the second spring 150 is engaged in the contraction portion 176. In embodiments of the present invention, the end of the spring is detachably fixedly connected to the spring seat by engaging the end of the spring in the contraction portion. Of course, the present invention is not limited thereto, and in other embodiments, the fixed connection can also be achieved by other means such as bonding or welding. In embodiments of the present invention, the receiving cavity may include a first cavity, a second cavity, and a third cavity arranged sequentially along the axial direction, and the radial dimensions of the first cavity, the second cavity, and the third cavity decrease sequentially. A limiting portion (step) for limiting the movement distance of the valve core is formed at the connection between the first cavity and the second cavity, and the valve core moves in the first cavity. The spring can extend from the first cavity to the third cavity and is engaged in the contracted third cavity, and the end of the spring is tightly fitted with the wall of the third cavity. There is a gap between the spring and the circumferential walls of the first cavity and the second cavity.

[0029] In some embodiments, the valve core has a boss, and the end of the spring is tightly fitted onto the boss. (Reference) Figure 1The discharge valve core 130 has a boss 132, and the end of the second spring 150 is tightly fitted onto the boss 132. Similarly, the intake valve core 120 also has a boss, and the end of the first spring 140 is tightly fitted onto the boss. This invention achieves a detachable and fixed connection between the end of the spring and the valve core by tightly fitting the end of the spring onto the boss. Of course, this invention is not limited to this; in other embodiments, a fixed connection can also be achieved by other methods such as bonding or welding.

[0030] In some embodiments, the first spring 140 and the second spring 150 are single-layer springs. A single-layer spring means that no other spring is fitted around the outside of the spring. A single-layer spring differs from the double-layer spring configuration in the prior art, where the outer spring is fitted around the inner spring. By using a single-layer spring, the problem of spring damage caused by friction between the inner and outer double-layer springs can be avoided. The strength of the single-layer spring can be improved by modifying the spring material, diameter, wire diameter, winding direction, and surface treatment, making it comparable to the strength of a double-layer spring.

[0031] In some embodiments, the discharge port 114 axially penetrates the valve body 110, and one axial end of the valve body 110 forms an enlarged end 111, through which the suction port passes. The suction valve core 120 and the discharge valve core 130 are respectively disposed on opposite axial sides of the valve body 110. The suction valve core 120 is annular and has a central hole 122 communicating with the discharge port 114. When the plunger pump is in the suction state, the suction valve core 120 is propelled by fluid along a first axial direction (e.g., ...). Figure 1 The valve core 120 moves vertically downwards to open the suction port 112, allowing fluid to be drawn into the plunger pump through the suction port 112; when the plunger pump is in the discharge state, the suction valve core 120 is pushed by the fluid along the second axial direction (e.g., vertically downwards) to open the suction port 112, so that fluid is drawn into the plunger pump through the suction port 112; when the plunger pump is in the discharge state, the suction valve core 120 moves vertically downwards to open the suction port 112, allowing fluid to be drawn into the plunger pump through the suction port 112; when the plunger pump is in the discharge state, the suction valve core 120 moves vertically downwards to open the suction port 112 through the fluid (e.g., vertically downwards) to open the suction port 112, so that fluid is drawn into the plunger pump through the suction port 112; when the plunger pump is in the discharge state, the suction valve core Figure 1 The valve core 130 moves vertically upward to close the suction port 112, and the discharge valve core 130 moves along the second axial direction under the pressure of the fluid to open the discharge port 114, so that the suction fluid is discharged to the outside of the plunger pump through the central port 122 and the discharge port 114.

[0032] When in use, the valve assembly 100 is installed inside the housing of the plunger pump. When in the suction state, fluid entering the housing from the fluid inlet on the plunger pump housing passes through the suction port 112 from the first side of the enlarged end 111 (e.g., Figure 1 The upper side of the middle flows into the second side (e.g., the upper side) Figure 1The fluid is drawn into the housing. When in the discharge state, the fluid inside the housing pushes the suction valve core 120 to move away from the pump body 110 to open the suction port 112, allowing the fluid to be smoothly drawn into the housing. When in the discharge state, the fluid inside the housing pushes the suction valve core 120 to move to close the suction port 112, and the fluid enters the discharge port 114 through the central hole 122 of the suction valve core 120, pushing the discharge valve core 130 to move to open the discharge port 114, allowing the fluid to be smoothly discharged through the discharge port 114.

[0033] refer to Figure 1 An enlarged end 113 is also formed at the other axial end of the valve body 110. The enlarged ends 111 and 113 are configured to be in a sealing connection with the housing of the plunger pump. The space between the enlarged ends 111 and 113 communicates with the fluid inlet on the housing. The enlarged end 113 can prevent backflow of fluid discharged from the discharge port 114.

[0034] The first spring seat 160 is provided with a fluid flow hole 165, through which fluid flowing in from the suction hole 112 can flow into the housing. The fluid flow hole 165 can be located on the bottom wall of the first spring seat 160. The second spring seat 170 is provided with a fluid flow hole 173, through which fluid flowing out from the discharge hole 114 can flow out of the housing. Multiple fluid flow holes 173 can be formed circumferentially on the circumferential wall of the second spring seat 170.

[0035] In some embodiments, the first spring seat 160 is configured to be fixedly connected to the housing of the plunger pump, and the second spring seat 170 is fixedly connected to the valve body 110. (See reference) Figure 1 and Figure 3 In some embodiments, the first spring seat 160 has a flange 161 with a connecting hole 163, through which the first spring seat 160 is fixedly connected to the housing of the plunger pump. The valve body 110 has an external thread 116, and the second spring seat 170 has an internal thread 171 that mates with the external thread 116. The valve body 110 may form a boss, with the sidewall of the boss forming the external thread 116. The engagement of the external thread 116 and the internal thread 171 allows for quick and easy fixation of the first spring seat 160 and the valve body 110.

[0036] In some embodiments, the second spring seat 170 has an operating engagement portion 175 for engaging with an external operating member, such that the external operating member can remove the valve assembly 100 at least partially from the piston pump housing. The operating engagement portion 175 may be a threaded hole disposed on the top wall of the second spring seat 170, which facilitates the removal of the second spring seat 170, the valve body 110 fixedly connected thereto, and the second spring 150 and the discharge valve core 130 disposed between the second spring seat 170 and the valve body 110 by screwing the external operating member into the threaded hole.

[0037] refer to Figure 3 The outer surface of the first spring seat 160 is provided with a mounting groove 167 for installing a sealing ring. The sealing ring installed in the mounting groove 167 is used to achieve a sealed connection between the first spring seat 160 and the housing of the plunger pump.

[0038] In some embodiments, the assembly method of the valve assembly 100 of the present invention includes the following steps: S1, tightly fit one end of the second spring 150 onto the boss 132 of the discharge valve core 130, then place the second spring 150 and the discharge valve core 130 together into the receiving cavity 172 of the second spring seat 170, so that the other end of the second spring 150 is inserted into the contraction portion 176 of the receiving cavity 172 of the second spring seat 170, and then fix the valve body 110 and the second spring seat 170 together through the engagement of the external thread 116 and the internal thread 171 to obtain the assembly.

[0039] S2, insert the sealing ring into the mounting groove 167 of the first spring seat 160, and then fix the first spring seat 160 to the housing of the plunger pump through the connecting hole 163, so that the first spring seat 160 and the housing of the plunger pump are sealed by the sealing ring.

[0040] S3, the first spring 140 is tightly fitted onto the protrusion of the suction valve core 120, and then the first spring 140 and the suction valve core 120 are placed together into the receiving cavity 162 of the first spring seat 160, so that the other end of the first spring 140 is inserted into the contracted portion 166 of the receiving cavity 162 of the first spring seat 160.

[0041] S4. Insert the assembled components from step S1 into the housing, so that the valve body 110 presses against the suction valve core 120, and the installation is completed.

[0042] According to another aspect of the present invention, a plunger pump is provided, comprising: a housing; a plunger disposed within the housing, the plunger being configured to reciprocate within the housing to switch the plunger pump between a suction state and a discharge state; and a valve assembly 100 as described above, the valve assembly 100 being disposed within the housing.

[0043] In summary, the present invention provides a valve assembly for a plunger pump and a corresponding plunger pump to solve the problem that the valve seat, valve plate and return spring in the hydraulic cylinder of the reciprocating plunger pump are easily damaged, and the pump efficiency is reduced after the return spring breaks.

[0044] This invention adds a reset spring limiting structure to prevent friction within the spring itself; furthermore, it replaces the existing double-layer spring with a single-layer spring, avoiding breakage caused by friction between the inner and outer spring layers. Ultimately, this extends the service life of the valve assembly.

[0045] First, this invention reduces the likelihood of spring breakage at its source by preventing wear on the return spring when the valve core opens. Reduced wear on the return spring lowers the risk of spring breakage due to wear. Second, the first and second spring seats provide positioning, guiding, and limiting functions, making the valve core's movement more stable and standardized. Stable and standardized valve core movement reduces abnormal forces on the spring, thereby reducing spring damage and extending the service life of the valve seat assembly. An extended service life of the valve seat assembly means fewer maintenance requirements, thus lowering maintenance costs. Simultaneously, reduced downtime due to valve assembly failure improves pump uptime, ensuring production continuity and efficiency. Overall, this invention offers advantages such as preventing return spring wear and breakage, extending valve assembly service life, reducing maintenance costs, and improving pump uptime.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A valve assembly (100) for a plunger pump, characterized in that, include: The valve body (110) has an intake port (112) and an exhaust port (114). Two valve cores (120, 130) are respectively configured to move to the position of opening the suction port (112) when the plunger pump is in the suction state, and to the position of opening the discharge port (114) when the plunger pump is in the discharge state; Two springs (140, 150) are configured to restore the two valve cores (120, 130) to their initial positions, respectively. Two spring seats (160, 170) respectively cooperate with the two springs (140, 150). Each spring seat (160, 170) has a receiving cavity (162, 172) for receiving the valve core (120, 130) and the spring (140, 150). The wall of the receiving cavity (162, 172) forms a protruding limiting part (164, 174) for limiting the movement distance of the valve core (120, 130) and thus limiting the compression degree of the spring (140, 150).

2. The valve assembly (100) according to claim 1, characterized in that, The two ends of the spring (140, 150) are fixed to the valve core (120, 130) and the spring seat (140, 150) respectively, and there is a gap between the body of the spring (140, 150) and the circumferential wall of the receiving cavity (162, 172).

3. The valve assembly (100) according to claim 2, characterized in that, The receiving cavity (162, 172) has a contraction portion (166, 176), and the end of the spring (140, 150) is engaged in the contraction portion (166, 176).

4. The valve assembly (100) according to claim 2, characterized in that, The valve core (120, 130) has a boss (132), and the end of the spring (140, 150) is tightly fitted onto the boss (132).

5. The valve assembly (100) according to claim 1, characterized in that, The springs (140, 150) are single-layer springs.

6. The valve assembly (100) according to claim 1, characterized in that, The discharge port (114) axially penetrates the valve body (110), the valve body (110) forms an enlarged end (111), and the suction port (112) penetrates the enlarged end (111); the two valve cores (120, 130) include a suction valve core (120) and a discharge valve core (130), the suction valve core (120) and the discharge valve core (130) are respectively disposed on both sides of the axial direction of the valve body (110), the suction valve core (120) is annular and has a central hole (122) communicating with the discharge port (114). When the plunger pump is in the suction state, the suction valve core (120) moves along the first axial direction under the push of the fluid to open the suction port (112), so that the fluid is drawn into the plunger pump through the suction port (112); When the plunger pump is in the discharge state, the suction valve core (120) moves along the second axial direction under the pressure of fluid to close the suction port (112), and the discharge valve core (130) moves along the second axial direction under the pressure of fluid to open the discharge port (114), so that the suction fluid is discharged to the outside of the plunger pump through the central hole (122) and the discharge port (114).

7. The valve assembly (100) according to claim 6, characterized in that, The two spring seats (160, 170) include a first spring seat (160) corresponding to the suction valve core (120) and a second spring seat (170) corresponding to the discharge valve core (130). The first spring seat (160) is configured to be fixedly connected to the housing of the plunger pump, and the second spring seat (170) is fixedly connected to the valve body (110).

8. The valve assembly (100) according to claim 7, characterized in that, The first spring seat (160) has a flange (161) and a connecting hole (163) on the flange (161). The first spring seat (160) is fixedly connected to the outer shell through the connecting hole (163). The valve body (110) has an external thread (116) and the second spring seat (170) has an internal thread (171) that mates with the external thread (116).

9. The valve assembly (100) according to claim 7, characterized in that, The second spring seat (170) has an operating engagement part (175) for engaging with an external operating member so that the external operating member can remove the valve assembly (100) at least partially from the housing of the plunger pump.

10. The valve assembly (100) according to claim 1, characterized in that, The spring seats (160, 170) are provided with fluid flow holes (165, 173).

11. A plunger pump, characterized in that, include: shell; A plunger disposed within the housing is configured to reciprocate within the housing to switch the plunger pump between a suction state and a discharge state. The valve assembly (100) as claimed in any one of claims 1-10, wherein the valve assembly (100) is disposed within the housing.

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