Valve body and fluid end with same

Abstract

The utility model relates to the technical field of fluid ends, in particular to a valve body and a fluid end with the valve body. The valve body comprises a cylindrical body and a sealing ring mounting table; the peripheral surfaces of the cylindrical body and the sealing ring mounting table are cylindrical surfaces, and the outer diameter of the sealing ring mounting table is smaller than that of the cylindrical body. The hydraulic end comprises the valve body and further comprises a sealing gasket, and the sealing gasket is made of tetrafluoroethylene. The sealing gasket is of a flat washer structure, the sealing gasket is arranged on the outer cylindrical surface of the sealing ring mounting table in a sleeving mode, and the upper surface of the sealing gasket abuts against the lower end face of the cylindrical body. The sealing gasket of a flat washer structure is arranged on the sealing ring mounting table of the valve body in a sleeving mode, the upper surface of the sealing gasket abuts against the lower end face of the columnar body, surface contact sealing is formed, the sealing contact area is provided, then the sealing effect can be improved, meanwhile, sealing is conducted in a surface contact mode, the sealing gasket is evenly stressed, and the sealing effect is improved. And the service life of the sealing gasket is prolonged. And the sealing gasket is made of tetrafluoroethylene, so that the sealing gasket has good corrosion resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic end, especially valve body and hydraulic end with the valve body. BACKGROUND

[0002] In combination Figure 1 , Figure 2 As shown in the prior art, the valve body 1 of the inlet and outlet valve of the hydraulic end is usually sealed with an inclined surface matched O-shaped ring 3 between the cylinder body 2, and the material of the O-shaped ring 3 is fluorine rubber. However, this design has some problems: first, since the O-shaped ring 3 and the inclined surface are in linear contact form, the effective sealing area formed by extrusion is small; due to the uneven compression force of the inclined sealing surface, the bottom of the inclined surface bears more pressure compared to the top, and the O-shaped ring 3 is easily damaged due to uneven stress; secondly, the cross-sectional shape of the inclined surface type sealing is trapezoidal, while the cross-sectional shape of the O-shaped sealing ring used is circular, and the two do not completely match in shape, thereby reducing the effective sealing contact area; finally, the O-shaped ring 3 in the extrusion deformation state for a long time will generate a large internal stress, which is prone to cracking or damage; finally, when encountering strong corrosive media (such as acidic neutralizing liquid used in the production process of phosphate), the O-shaped ring 3 of the commonly used fluorine rubber material is difficult to resist corrosion, thereby increasing the risk of leakage and frequently replacing the sealing element. UTILITY MODEL CONTENT

[0003] The main purpose of the utility model is to provide a valve body and a hydraulic end with the valve body, which aims to solve the above technical problems.

[0004] To achieve the above purpose, on the one hand, the utility model provides a valve body, which comprises a cylindrical body and a sealing ring mounting table integrally formed on the lower end face of the cylindrical body; the outer circumferential surface of the cylindrical body and the sealing ring mounting table is a cylindrical surface, and the outer diameter of the sealing ring mounting table is smaller than the outer diameter of the cylindrical body.

[0005] Preferably, a spring mounting boss is integrally formed on the bottom surface of the sealing ring mounting table.

[0006] Preferably, a liquid discharge counterbore, a valve core mounting hole and a through hole are provided on the valve body; the liquid discharge counterbore is arranged at the center position of the top surface of the cylindrical body; the valve core mounting hole is arranged at the center position of the valve body, and the valve core mounting hole is sequentially penetrated through the cylindrical body, the sealing ring mounting table and the spring mounting boss from top to bottom; the through hole is sequentially penetrated through the sealing ring mounting table and the cylindrical body from bottom to top, and the liquid inlet of the through hole is located on the bottom surface of the sealing ring mounting table, and the liquid outlet of the through hole is located on the bottom wall of the liquid discharge counterbore.

[0007] Preferably, the angle between the axis of the through hole and the central axis of the valve body is 6 degrees; the number of the through holes is 6, and the 6 through holes are arranged in a ring shape and are uniformly distributed around the valve core mounting hole.

[0008] Preferably, an inverted bevel is arranged on the edge of the mouth of the liquid discharge counterbore to form a sealing taper surface.

[0009] In another aspect, the utility model also provides a kind of hydraulic end, including above-mentioned valve body, still including sealing pad, the material of sealing pad is tetrafluoroethylene;Sealing pad is flat washer structure, and sealing pad is sleeved on the outer cylindrical surface of the sealing ring installation platform, and the upper surface of sealing pad is abutted on the lower end surface of the cylindrical body.

[0010] Preferably, the hydraulic end further comprises a cylinder body, a horizontal liquid outlet channel and a liquid inlet channel are arranged on the upper and lower parts of the cylinder body; a plurality of vertical cavities are arranged on the cylinder body, each vertical cavity extends from the top surface of the cylinder body to the position above the liquid inlet channel after penetrating through the liquid outlet channel; each vertical cavity is communicated by a liquid inlet hole between the bottom wall and the liquid inlet channel; a liquid discharge valve assembly and a liquid inlet valve assembly are respectively installed on the upper and lower parts of each vertical cavity; the liquid discharge valve assembly and the liquid inlet valve assembly each comprise a valve core and the valve body and a sealing pad; the valve core is installed on the valve body; a plurality of plunger mounting seats are installed on the side surface of the cylinder body, and plungers are slidingly installed in the plunger mounting seats; one end of the plunger can extend into the vertical cavity.

[0011] Preferably, a first pressing sleeve and a second pressing sleeve are installed in the vertical cavity; the lower end surfaces of the valve body and the sealing pad of the liquid inlet valve assembly are abutted on the step surface between the vertical cavity and the liquid inlet hole; the lower end surface of the first pressing sleeve is abutted on the top surface of the valve body of the liquid inlet valve assembly; the lower end surfaces of the valve body and the sealing pad of the liquid discharge valve assembly are abutted on the top surface of the first pressing sleeve; the lower end surface of the second pressing sleeve is abutted on the top surface of the valve body of the liquid discharge valve assembly; a plug body is installed on the mouth of the vertical cavity, and the plug body is pressed against the top surface of the second pressing sleeve; a sealing ring is arranged between the outer cylindrical surface of the plug body and the inner wall of the vertical cavity; a pressing plate is arranged on the top surface of the cylinder body, and the pressing plate is pressed against the top surface of the plug body.

[0012] Preferably, the valve core comprises a disc-shaped body and a slide rod integrally formed on the bottom surface of the disc-shaped body; the slide rod is slidingly inserted into the valve core mounting hole of the valve body; an inverted bevel is arranged on the lower edge of the disc-shaped body to form a tapered surface; the tapered surface of the disc-shaped body cooperates with the sealing taper surface of the valve body to form a taper surface seal.

[0013] Preferably, a convex column is integrally formed on the top surface of the disc-shaped body; a spring mounting column is integrally formed on the center of the bottom surface of the plug body, and a first spring is sleeved on the spring mounting column; the lower end of the first spring is sleeved on the convex column of the valve core on the liquid discharge valve assembly; the sliding rod of the valve core on the liquid inlet valve assembly is sleeved with a spring seat after passing through the valve core mounting hole, and a second spring is sleeved on the spring seat, and the upper end of the second spring is sleeved on the spring mounting convex platform of the valve body on the liquid inlet valve assembly; the first spring and the second spring are both in a compressed state.

[0014] Due to the adoption of the above technical scheme, the utility model has the beneficial effects as follows:

[0015] (1) In the utility model, the sealing ring mounting table is arranged on the lower end surface of the columnar body of the valve body, the outer circumferential surface of the columnar body and the sealing ring mounting table is a cylindrical surface, and the outer diameter of the sealing ring mounting table is smaller than the outer diameter of the columnar body, so that the sealing surface formed between the sealing ring mounting table and the columnar body is a plane, overcoming the problem of the inclined surface sealing in the prior art. Meanwhile, in the liquid force end provided by the utility model, the sealing gasket with the flat gasket structure is sleeved on the sealing ring mounting table of the valve body, and the upper surface of the sealing gasket abuts against the lower end surface of the columnar body to form a surface contact sealing, providing a sealing contact area, thereby improving the sealing effect, and the sealing gasket is sealed in a surface contact mode, so that the sealing gasket is uniformly stressed, prolonging the service life of the sealing gasket.

[0016] (2) Compared with the fluororubber O-shaped ring in the prior art, the sealing gasket with tetrafluoroethylene is assembled in the valve body and the liquid force end with the valve body provided by the embodiment, and not only has a smaller compression over deformation, but also the upper and lower end surfaces of the sealing gasket are in surface contact, providing a larger effective sealing area to reduce the risk of leakage, and the sealing gasket with tetrafluoroethylene exhibits excellent resistance to most chemical substances including strong acid, and has good self-cleaning properties, i.e. the surface is smooth and not easy to attach impurities, which helps to prevent the occurrence of fouling phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings from the structures shown in the drawings without creating any creative labor.

[0018] Figure 1 It is a schematic view of the sealing of the valve body and the cylinder body in the prior art by using the inclined surface matched O-shaped ring;

[0019] Figure 2A schematic view of the inclined surface of the valve body and the O-ring in the prior art;

[0020] Figure 3 A main sectional view of the valve body provided by the utility model;

[0021] Figure 4 A bottom view of the valve body provided by the utility model;

[0022] Figure 5 A front view of the fluid end provided by the utility model;

[0023] Figure 6 A Figure 5 A-A sectional view;

[0024] Figure 7 A main sectional view of the sealing gasket in the utility model;

[0025] Figure 8 A top view of the sealing gasket in the utility model;

[0026] Figure 9 A structural schematic view of the valve core in the utility model;

[0027] Figure 10 A principle view when the valve core is opened in the utility model;

[0028] Figure 11 A principle view when the valve core is closed in the utility model.

[0029] BRIEF DESCRIPTION OF DRAWINGS: 1, valve body; 1a, cylindrical body; 1b, sealing ring mounting table; 1c, sealing conical surface; 1d, liquid discharge counterbore; 1e, valve core mounting hole; 1f, through hole; 1g, spring mounting boss; 2, cylinder body; 2a, liquid outlet channel; 2b, liquid inlet channel; 2c, liquid inlet hole; 3, O-ring; 4, sealing gasket; 5, plunger mounting seat; 6, plunger; 7, valve core; 7a, disc-shaped body; 7b, slide rod; 7c, conical surface; 7d, protruding column; 8, first pressing sleeve; 9, second pressing sleeve; 10, plug body; 10a, spring mounting column; 11, sealing ring; 12, pressing plate; 13, first spring; 14, spring seat; 15, second spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0033] In combination with Figure 3 , Figure 4 , on the one hand, the present embodiment provides a valve body, which comprises a cylindrical body 1a and a sealing ring mounting table 1b integrally formed on the lower end surface of the cylindrical body 1a; the outer circumferential surface of the cylindrical body 1a and the sealing ring mounting table 1b is a cylindrical surface, and the outer diameter of the sealing ring mounting table 1b is smaller than the outer diameter of the cylindrical body 1a.

[0034] Specifically, in the present embodiment, the outer diameter of the sealing ring mounting table 1b is φ77mm, the outer diameter of the cylindrical body 1a is φ90mm, the height of the sealing ring mounting table 1b is 6.5mm, and the sealing surface is formed between the sealing ring mounting table 1b and the cylindrical body 1a.

[0035] In combination with Figure 3 , a spring mounting boss 1g is integrally formed on the bottom surface of the sealing ring mounting table 1b.

[0036] In combination with Figure 3 , a drain counterbore 1d, a valve core mounting hole 1e and a through hole 1f are provided on the valve body 1; the drain counterbore 1d is arranged at the center position of the top surface of the cylindrical body 1a; the valve core mounting hole 1e is arranged at the center position of the valve body 1, and the valve core mounting hole 1e penetrates the cylindrical body 1a, the sealing ring mounting table 1b and the spring mounting boss 1g from top to bottom; the through hole 1f penetrates the sealing ring mounting table 1b and the cylindrical body 1a from bottom to top, and the liquid inlet of the through hole 1f is located on the bottom surface of the sealing ring mounting table 1b, and the liquid outlet of the through hole 1f is located on the bottom wall of the drain counterbore 1d.

[0037] Further, the angle between the axis of the through hole 1f and the central axis of the valve body 1 is 6 degrees; the number of the through holes 1f is 6, and the 6 through holes 1f are arranged in a ring around the valve core mounting hole 1e.

[0038] In combination Figure 3 As shown, an inverted bevel is arranged on the edge of the mouth of the liquid discharge counterbore 1d to form a sealing cone surface 1c.

[0039] In combination Figures 5 to 9 As shown, in another aspect, the embodiment also provides a fluid end, which comprises the above valve body 1, and further comprises a sealing gasket 4, the material of the sealing gasket 4 is tetrafluoroethylene; the sealing gasket 4 is a flat washer structure, and the sealing gasket 4 is sleeved on the outer cylindrical surface of the sealing ring mounting table 1b, and the upper surface of the sealing gasket 4 abuts against the lower end surface of the cylindrical body 1a. Specifically, the outer diameter of the sealing gasket 4 is φ90mm, the hole diameter of the center hole is φ77mm, and the thickness of the sealing gasket 4 is not less than 6.5mm.

[0040] In the embodiment, the fluid end further comprises a cylinder body 2, and a transverse liquid outlet channel 2a and a liquid inlet channel 2b are arranged on the upper and lower parts of the cylinder body 2; a plurality of vertical cavities are arranged on the cylinder body 2; the diameter of the vertical cavity is greater than the diameter of the liquid outlet channel 2a; each vertical cavity extends from the top surface of the cylinder body 2 downward through the liquid outlet channel 2a and then extends to a position above the liquid inlet channel 2b; the bottom wall of each vertical cavity is communicated with the liquid inlet channel 2b through a liquid inlet hole 2c; a liquid discharge valve assembly and a liquid inlet valve assembly are respectively arranged on the upper and lower parts of each vertical cavity; the liquid discharge valve assembly and the liquid inlet valve assembly each comprise a valve core 7, the valve body 1 and the sealing gasket 4; the valve core 7 is mounted on the valve body 1; a plurality of plunger mounting seats 5 are mounted on the side surface of the cylinder body 2, and plungers 6 are slidably mounted in the plunger mounting seats 5, one end of the plunger 6 can extend into the vertical cavity.

[0041] Further, a first pressing sleeve 8 and a second pressing sleeve 9 are mounted in the vertical cavity; the lower end surfaces of the valve body 1 and the sealing gasket 4 of the liquid inlet valve assembly abut against the stepped surface between the vertical cavity and the liquid inlet hole 2c; the lower end surface of the first pressing sleeve 8 abuts against the top surface of the valve body 1 of the liquid inlet valve assembly; the lower end surfaces of the valve body 1 and the sealing gasket 4 of the liquid discharge valve assembly abut against the top surface of the first pressing sleeve 8; the lower end surface of the second pressing sleeve 9 abuts against the top surface of the valve body 1 of the liquid discharge valve assembly; a plug body 10 is mounted on the mouth of the vertical cavity, and the plug body 10 is pressed against the top surface of the second pressing sleeve 9; a sealing ring 11 is arranged between the outer cylindrical surface of the plug body 10 and the inner wall of the vertical cavity; a pressing plate 12 is arranged on the top surface of the cylinder body 2, and the pressing plate 12 is pressed against the top surface of the plug body 10. And the valve body 1 of the liquid discharge valve assembly is located below the liquid outlet channel 2a.

[0042] Combination Figure 9 As shown in the drawings, the valve core 7 comprises a disc-shaped body 7a and a slide rod 7b integrally formed on the bottom surface of the disc-shaped body 7a; the slide rod 7b is slidingly inserted into the valve core mounting hole 1e of the valve body 1; the lower edge of the disc-shaped body 7a is provided with an inverted bevel forming a tapered surface 7c; the tapered surface 7c of the disc-shaped body 7a cooperates with the sealing tapered surface 1c of the valve body 1 to form a tapered surface seal.

[0043] Combination Figure 6 and Figure 9 As shown in the drawings, a convex column 7d is integrally formed on the top surface of the disc-shaped body 7a; a spring mounting column 10a is integrally formed on the bottom surface of the plug body 10, and a first spring 13 is sleeved on the spring mounting column 10a; the lower end of the first spring 13 is sleeved on the convex column 7d of the valve core 7 of the liquid discharge valve assembly; the slide rod 7b of the valve core 7 of the liquid inlet valve assembly is sleeved with a spring seat 14 after passing through the valve core mounting hole 1e, and a second spring 15 is sleeved on the spring seat 14; the upper end of the second spring 15 is sleeved on the spring mounting convex column 1g of the valve body 1 of the liquid inlet valve assembly. The first spring 13 and the second spring 15 are both in a compressed state.

[0044] Combination Figure 6 , Figure 10 , Figure 11 As shown in the drawings, the working principle of the hydraulic end is as follows:

[0045] When the plunger 6 moves to the left, a low-pressure area is formed above the liquid inlet valve assembly, and a high-pressure area is formed below the liquid inlet valve assembly; the liquid in the high-pressure area acts on the disc-shaped body 7a of the valve core 7 through the through hole 1f, and pushes the disc-shaped body 7a upward; the valve core 7 overcomes the elastic force of the second spring 15 and moves upward; at this time, the tapered surface 7c of the disc-shaped body 7a of the valve core 7 separates from the sealing tapered surface 1c of the valve body 1, the valve core 7 is opened, and the liquid in the liquid inlet channel 2b enters the low-pressure area from the high-pressure area below the liquid inlet valve assembly through the liquid inlet hole 2c. At the same time, a high-pressure area is formed above the liquid discharge valve assembly, and a low-pressure area is formed below the liquid discharge valve assembly; the liquid in the high-pressure area acts on the disc-shaped body 7a of the valve core 7 of the liquid discharge valve assembly, and pushes the valve core 7 downward to form a seal against the valve body 7.

[0046] When the plunger 6 moves to the right, the upper part of the liquid inlet valve assembly forms a high pressure area, and the lower part forms a low pressure area. Under the action of the liquid force in the high pressure area and the reset force of the second spring 15, the valve core 7 on the liquid inlet valve assembly moves downward. The conical surface 7c of the disc-shaped body 7a of the valve core 7 on the liquid inlet valve assembly is in contact with the sealing conical surface 1c of the valve body 1 to seal. At the same time, the upper part of the liquid outlet valve assembly forms a low pressure area, and the lower part forms a high pressure area. The liquid force in the high pressure area pushes the disc-shaped body 7a of the valve core 7 on the liquid outlet valve assembly upward to overcome the elastic force of the first spring 13, so that the valve core 7 of the liquid outlet valve assembly is opened. The liquid below the liquid outlet valve assembly enters the low pressure area above the liquid outlet valve assembly through the through hole 1f, and then is discharged from the liquid outlet channel 2a.

[0047] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the concept of the present application, using the content of the present application specification and drawings, is included in the patent protection range of the present application.

Claims

1. A valve body characterized by: The valve body (1) comprises a cylindrical body (1a) and a sealing ring mounting table (1b) integrally formed on the lower end surface of the cylindrical body (1a); the outer circumferential surface of the cylindrical body (1a) and the sealing ring mounting table (1b) is a cylindrical surface, and the outer diameter of the sealing ring mounting table (1b) is smaller than the outer diameter of the cylindrical body (1a).

2. A valve body as claimed in claim 1, wherein A spring mounting boss (1g) is integrally formed on the bottom surface of the sealing ring mounting table (1b).

3. A valve body as claimed in claim 2, wherein A drain sink (1d), a valve core mounting hole (1e) and a through hole (1f) are arranged on the valve body (1); The drain sink (1d) is arranged at the center position of the top surface of the cylindrical body (1a); The valve core mounting hole (1e) is arranged at the center position of the valve body (1), and the valve core mounting hole (1e) penetrates the cylindrical body (1a), the sealing ring mounting table (1b) and the spring mounting boss (1g) from top to bottom in sequence; The through hole (1f) penetrates the sealing ring mounting table (1b) and the cylindrical body (1a) from bottom to top in sequence, and the liquid inlet of the through hole (1f) is located on the bottom surface of the sealing ring mounting table (1b), and the liquid outlet of the through hole (1f) is located on the bottom wall of the drain sink (1d).

4. A valve body as claimed in claim 3, wherein The angle between the axis of the through hole (1f) and the central axis of the valve body (1) is 6 degrees; the number of the through hole (1f) is 6, and the six through holes (1f) are arranged in a ring around the valve core mounting hole (1e).

5. A valve body as claimed in claim 3, wherein An inverted bevel is arranged on the edge of the mouth of the drain sink (1d) to form a sealing conical surface (1c).

6. A fluid end characterized by, The valve body (1) of claim 5 further comprises a sealing gasket (4), the material of the sealing gasket (4) is tetrafluoroethylene; the sealing gasket (4) is a flat washer structure, and the sealing gasket (4) is sleeved on the outer cylindrical surface of the sealing ring mounting table (1b), and the upper surface of the sealing gasket (4) abuts against the lower end surface of the cylindrical body (1a).

7. A fluid end as in claim 6 wherein, A cylinder body (2) is further included, and a transverse liquid outlet channel (2a) and a liquid inlet channel (2b) are arranged on the upper and lower parts of the cylinder body (2); a plurality of vertical cavities are arranged on the cylinder body (2), each vertical cavity extends from the top surface of the cylinder body (2) downward, penetrates the liquid outlet channel (2a), and then extends to a position above the liquid inlet channel (2b); the bottom wall of each vertical cavity is communicated with the liquid inlet channel (2b) through a liquid inlet hole (2c); A liquid discharge valve assembly and a liquid inlet valve assembly are respectively arranged on the upper and lower parts of each vertical cavity; the liquid discharge valve assembly and the liquid inlet valve assembly each comprise a valve core (7), the valve body (1) and the sealing gasket (4); the valve core (7) is arranged on the valve body (1); A plurality of plunger mounting seats (5) are arranged on the side surface of the cylinder body (2), and plungers (6) are slidably arranged in the plunger mounting seats (5), one end of each plunger (6) can extend into the vertical cavity.

8. A fluid end as in claim 7 wherein, A first pressing sleeve (8) and a second pressing sleeve (9) are arranged in the vertical cavity; The lower end surface of the valve body (1) and the sealing gasket (4) of the liquid inlet valve assembly abut against the stepped surface between the vertical cavity and the liquid inlet hole (2c); The lower end surface of the first pressing sleeve (8) abuts against the top surface of the valve body (1) of the liquid inlet valve assembly; The lower end face of the valve body (1) and the sealing gasket (4) on the liquid discharge valve assembly abut against the top face of the first pressing sleeve (8); The lower end face of the second pressing sleeve (9) abuts against the top face of the valve body (1) on the liquid discharge valve assembly; A plug body (10) is mounted at the mouth of the vertical cavity, and the plug body (10) is pressed against the top face of the second pressing sleeve (9); a sealing ring (11) is arranged between the outer cylindrical surface of the plug body (10) and the inner wall of the vertical cavity; a pressing plate (12) is arranged on the top face of the cylinder body (2), and the pressing plate (12) is pressed against the top face of the plug body (10).

9. A fluid end as in claim 8 wherein, The valve core (7) comprises a disc-shaped body (7a) and a sliding rod (7b) integrally formed on the bottom face of the disc-shaped body (7a); the sliding rod (7b) is slidingly inserted into the valve core mounting hole (1e) of the valve body (1); the lower edge of the disc-shaped body (7a) is provided with an inverted bevel forming a tapered face (7c); the tapered face (7c) of the disc-shaped body (7a) cooperates with the sealing tapered face (1c) of the valve body (1) to form a tapered face seal.

10. A fluid end as in claim 9 wherein, A convex column (7d) is integrally formed on the top face of the disc-shaped body (7a); a spring mounting column (10a) is integrally formed at the center of the bottom face of the plug body (10), and a first spring (13) is sleeved on the spring mounting column (10a); the lower end of the first spring (13) is sleeved on the convex column (7d) of the valve core (7) on the liquid discharge valve assembly; The sliding rod (7b) of the valve core (7) on the liquid inlet valve assembly is provided with a spring seat (14) after passing through the valve core mounting hole (1e), and a second spring (15) is sleeved on the spring seat (14); the upper end of the second spring (15) is sleeved on the spring mounting convex column (1g) of the valve body (1) on the liquid inlet valve assembly; The first spring (13) and the second spring (15) are both in a compressed state.

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