A check valve with a split-type valve plate assembly

Abstract

A one-way valve with a split valve plate assembly, wherein the split valve plate assembly and the valve plate assembly fixing device can be manufactured independently, and the two can be efficiently and reliably assembled to form a split valve plate assembly. The one-way valve has an outlet countersunk hole at the bottom of the valve seat, a flow hole inside the valve seat, an inlet countersunk hole at the top of the valve seat, a through hole at the center of the valve seat, and a transverse hole on the wall of the outlet countersunk hole. The valve plate on the valve plate assembly is integrally formed with the fixing post. The valve plate assembly is installed in the center hole of the valve seat. The rivet shank head passes through the through hole at the center of the valve plate assembly and the through hole at the center of the valve seat, and the rivet shank head is turned outward and pressed against the bottom surface of the inlet countersunk hole of the valve seat. When the outlet side pressure is greater than the inlet side pressure, the valve plate is pressed tightly against the top surface of the valve seat sealing boss, thus closing the valve. When the outlet side pressure is less than the inlet side pressure, the valve plate deforms and moves away from the valve seat sealing boss, opening the valve.

Description

Technical Field

[0001] This invention relates to a check valve with a split valve plate assembly, particularly a check valve for use in the engine crankcase breathing system. Background Technology

[0002] The crankcase breather system of an engine guides oil vapors from the crankcase through the engine intake manifold into the engine combustion chamber for combustion, preventing oil vapors from overflowing and polluting the environment. Traditional engine crankcase breather systems' oil-vapor separators cannot completely filter oil particles. These particles accumulate in the breather pipe and flow into the combustion chamber, leading to poor combustion of the engine lubricating oil and producing polluting exhaust gases, thus worsening the engine's environmental emissions performance. Therefore, it is necessary to return the oil in the breather pipe to the engine's crankcase. However, high-speed engine operation causes rapid pressure changes in the crankcase, sometimes exceeding and sometimes falling below the external pressure. Therefore, a simple one-way valve is needed to control the unidirectional return of oil from the breather pipe to the crankcase, preventing oil vapors from overflowing and enabling automatic opening and closing. Furthermore, the one-way valve should be easily removable when replacement is needed. Summary of the Invention

[0003] In view of the foregoing, the present invention aims to provide a one-way valve with a split valve plate assembly that has a simple assembly structure and can automatically open and close.

[0004] This invention discloses a check valve with a split valve plate assembly, characterized in that:

[0005] The one-way valve includes a valve seat and a split valve plate assembly.

[0006] The valve seat has an inlet countersunk hole at the top and an outlet countersunk hole at the bottom, with a sealing boss on the bottom surface of the outlet countersunk hole.

[0007] The split valve plate assembly includes a valve plate assembly and a valve plate assembly fixing device;

[0008] in,

[0009] The valve plate assembly includes a valve plate, a fixing post disposed at the axis of the valve plate assembly, and a fixing post through hole disposed at the axis of the fixing post. The valve plate and the fixing post are an integral structure.

[0010] When the outlet pressure of the one-way valve is greater than the inlet pressure, the force generated by the pressure difference between the two sides presses the valve plate in the split valve plate assembly tightly against the top surface of the sealing boss, thereby closing the one-way valve and preventing oil vapor from leaking out of the engine crankcase.

[0011] When the outlet pressure of the check valve is less than the inlet pressure, the force generated by the pressure difference between the two sides causes the valve plate in the split valve plate assembly to leave the top surface of the sealing boss, thereby opening the check valve and allowing the oil outside the crankcase to flow back into the crankcase.

[0012] The high-speed operation of the engine causes the pressure in the crankcase to change rapidly between positive and negative pressure. The pressure difference on both sides of the one-way valve causes the magnitude and direction of the force on the split valve plate assembly to change with the pressure change in the crankcase, thereby automatically controlling the opening and closing of the one-way valve.

[0013] Preferably, the interior is provided with an overflow hole.

[0014] Preferred,

[0015] A valve seat through hole is provided at the center of the bottom surface of the inlet countersunk hole, and a central countersunk hole connecting the valve seat through hole is provided at the center of the bottom surface of the outlet countersunk hole.

[0016] Preferred,

[0017] The rear end of the through hole of the fixing post is provided with a chamfer, and the fixing post is installed in the central countersunk hole.

[0018] Preferred,

[0019] The valve plate assembly is fixed by a rivet;

[0020] The top surface of the fixed column abuts against the bottom surface of the central countersunk hole, and the head of the rivet rod passes through the through hole of the fixed column and the through hole of the valve seat and then extends into the inlet countersunk hole.

[0021] Preferred,

[0022] The cross-sectional thickness of the valve plate gradually increases from the outer edge to the center.

[0023] Preferred,

[0024] The rivet has a countersunk conical surface, which is pressed tightly against the chamfer of the fixing post through hole at the rear end of the fixing post through hole.

[0025] Preferred,

[0026] The rivet head of the rivet is turned outward, and the bottom surface of the turned-out rivet head presses against the bottom surface of the inlet countersunk hole.

[0027] Preferred,

[0028] The outlet countersunk hole has transverse holes on its wall.

[0029] Preferred,

[0030] A raised ring is provided on the outer circular surface of the valve seat.

[0031] The present invention has the following advantages:

[0032] This invention relates to a one-way valve with a split valve plate assembly for the crankcase. It utilizes the rapid pressure changes within the crankcase during high-speed engine operation, between positive and negative pressures, to achieve valve closure through the interaction of the split valve plate assembly and valve seat. This prevents engine oil leakage and avoids excessive crankcase pressure, extending oil lifespan and reducing component wear and corrosion. Furthermore, the one-way valve with a split valve plate assembly described in this invention has a simple structure, reliable assembly, high operating efficiency, better reliability and sensitivity, and is easy to disassemble. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a cross-sectional view of a one-way valve structure with a split valve plate assembly according to an embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional view of a one-way valve with a split valve plate assembly in the open state according to an embodiment of the present invention;

[0036] Figure 3 This is a cross-sectional view of the split valve plate assembly structure according to an embodiment of the present invention;

[0037] Figure 4 This is a 3D schematic diagram of a check valve with a split valve plate assembly according to an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the appendices in the embodiments of the present invention. Figures 1 to 4 The technical solutions in the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," "parallel," or "vertical" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0044] The present invention will now be further described with reference to the accompanying drawings:

[0045] In one embodiment,

[0046] This invention discloses a check valve with a split valve plate assembly, characterized in that:

[0047] The check valve includes a valve seat (1) and a split valve plate assembly;

[0048] When the outlet pressure of the check valve is greater than the inlet pressure, the force generated by the pressure difference between the two sides closes the check valve through the split valve plate assembly, preventing oil vapor from overflowing from the engine crankcase.

[0049] When the outlet pressure of the check valve is less than the inlet pressure, the force generated by the pressure difference between the two sides opens the check valve through the split valve plate assembly, allowing the oil outside the crankcase to flow back into the crankcase.

[0050] The high-speed operation of the engine causes the pressure in the crankcase to change rapidly between positive and negative pressure. The pressure difference on both sides of the one-way valve causes the magnitude and direction of the force on the split valve plate assembly to change with the pressure change in the crankcase, thereby automatically controlling the opening and closing of the one-way valve.

[0051] Through the above embodiments, the one-way valve with a split valve plate assembly utilizes the rapid pressure change between positive and negative pressure in the crankcase during high-speed engine operation. The split valve plate assembly, in conjunction with the valve seat, achieves valve closure. This not only reduces engine oil leakage but also prevents excessive crankcase pressure, extends oil life, and reduces component wear and corrosion.

[0052] In another preferred embodiment,

[0053] The valve seat (1) is provided with overflow holes (1-4).

[0054] In another preferred embodiment,

[0055] A valve seat through hole (1-6) is provided at the center of the bottom surface of the inlet countersunk hole (1-5), and a central countersunk hole (1-7) connecting the valve seat through hole (1-6) is provided at the center of the bottom surface of the outlet countersunk hole (1-1).

[0056] In another preferred embodiment,

[0057] The rear end of the through hole (2-3) of the fixing post is provided with a chamfer (2-4) for the through hole of the fixing post, and the fixing post (2-2) is installed in the central countersunk hole (1-7).

[0058] In another preferred embodiment,

[0059] The valve plate assembly is fixed by rivets (3);

[0060] The top surface of the fixed column (2-2) abuts against the bottom surface of the central countersunk hole (1-7), and the head of the rivet rod of the rivet (3) passes through the through hole (2-3) of the fixed column and the through hole (1-6) of the valve seat and then extends into the inlet countersunk hole (1-5).

[0061] In another preferred embodiment,

[0062] The cross-sectional thickness of the valve plate (2-1) gradually increases from the outer edge to the center.

[0063] In another preferred embodiment,

[0064] The rivet (3) has a countersunk conical surface, which is pressed tightly against the chamfer (2-4) of the fixing post through hole (2-3) at the rear end of the fixing post through hole.

[0065] In another preferred embodiment,

[0066] The rivet head of the rivet (3) is turned outward, and the bottom surface of the turned-out rivet head presses against the bottom surface of the inlet countersunk hole (1-5).

[0067] In another preferred embodiment,

[0068] A transverse hole (1-8) is provided on the wall of the outlet countersunk hole (1-1).

[0069] In another preferred embodiment,

[0070] A raised ring (1-3) is provided on the outer circular surface of the valve seat (1).

[0071] In another preferred embodiment,

[0072] This invention discloses a check valve with an integrated valve plate assembly, characterized in that:

[0073] The check valve includes a valve seat (1) and a separate valve plate assembly.

[0074] The valve seat (1) is provided with an inlet countersunk hole (1-5) at the top and an outlet countersunk hole (1-1) at the bottom. A sealing boss (1-2) is provided on the bottom surface of the outlet countersunk hole (1-1).

[0075] The split valve plate assembly includes a valve plate assembly (2) and a valve plate assembly fixing device;

[0076] in,

[0077] The valve plate assembly (2) includes a valve plate (2-1), a fixing post (2-2) disposed at the axis of the valve plate assembly (2), and a fixing post through hole (2-3) disposed at the axis of the fixing post (2-2). The valve plate (2-1) and the fixing post (2-2) are an integral structure.

[0078] When the outlet pressure of the one-way valve is greater than the inlet pressure, the force generated by the pressure difference between the two sides presses the valve plate (2-1) in the split valve plate assembly tightly against the top surface of the sealing boss (1-2), thereby closing the one-way valve and preventing oil vapor from leaking out of the engine crankcase.

[0079] When the outlet pressure of the check valve is less than the inlet pressure, the force generated by the pressure difference between the two sides causes the valve plate (2-1) in the split valve plate assembly to leave the top surface of the sealing boss (1-2), thereby opening the check valve and allowing the oil outside the crankcase to flow back into the crankcase.

[0080] The high-speed operation of the engine causes the pressure in the crankcase to change rapidly between positive and negative pressure. The pressure difference on both sides of the one-way valve causes the magnitude and direction of the force on the split valve plate assembly to change with the pressure change in the crankcase, thereby automatically controlling the opening and closing of the one-way valve.

[0081] It is understood that the key aspect of the above embodiment is that the valve plate (2-1), the fixing post (2-2) located at the center of the valve plate assembly (2), and the fixing post through hole (2-3) located at the center of the fixing post (2-2) constitute the valve plate assembly (2), and the valve plate assembly (2) and the valve plate assembly fixing device form a separate valve plate assembly. The valve plate assembly and the valve plate assembly fixing device can be manufactured independently, simplifying the manufacturing process, and the assembly structure is simple, resulting in high operating efficiency. On this basis, the one-way valve controls the oil in the breather pipe to flow back unidirectionally into the crankcase, preventing the oil vapor in the crankcase from overflowing, and realizing automatic opening and closing. The separate valve plate assembly referred to in this invention means that the valve plate assembly and the valve plate assembly fixing device can be manufactured independently, and the two can be assembled efficiently and reliably to form a separate valve plate assembly.

[0082] Thus, the working principle of the one-way valve of this invention can be understood:

[0083] When the outlet pressure of the one-way valve is greater than the inlet pressure, the force generated by the pressure difference on both sides of the valve plate (2-1) will press the valve plate (2-1) tightly against the top surface of the sealing boss (1-2) of the valve seat (1) to close the one-way valve and prevent oil vapor from overflowing from the engine crankcase.

[0084] When the pressure on the outlet side of the check valve is less than the pressure on the inlet side, the force generated by the pressure difference will deform the valve plate (2-1) and cause it to leave the top surface of the sealing boss (1-2) of the valve seat (1), thus opening the check valve. The inlet countersunk hole (1-5) is connected to the breather pipe outside the engine crankcase. Under the action of the pressure difference, the oil in the inlet countersunk hole (1-5) flows into the engine crankcase from the opening of the valve plate (2-1) and the outlet countersunk hole (1-1), realizing the return of the oil outside the crankcase to the crankcase. The high-speed operation of the engine causes the pressure inside the crankcase to change rapidly between positive and negative pressure. The magnitude and direction of the force generated by the pressure difference on both sides of the valve plate (2-1) change with the pressure change inside the crankcase, thereby automatically controlling the opening and closing of the valve plate (2-1).

[0085] In another preferred embodiment,

[0086] See Figure 1 The valve seat (1) is provided with an overflow hole (1-4) inside. The bottom surface of the inlet countersunk hole (1-5) is provided with a valve seat through hole (1-6) at the center. The bottom surface of the outlet countersunk hole (1-1) is provided with a central countersunk hole (1-7) connecting the valve seat through hole (1-6). When the one-way valve is opened, the inlet countersunk hole (1-5) is connected to the breather pipe outside the engine crankcase. The oil in the inlet countersunk hole (1-5) flows into the engine crankcase from the opening of the valve plate (2-1), the overflow hole (1-4) and the outlet countersunk hole (1-1) under the action of pressure differential, so as to realize the return of oil outside the crankcase to the crankcase.

[0087] In another preferred embodiment,

[0088] See appendix Figures 1 to 2 A raised ring (1-3) is provided on the outer circular surface of the valve seat (1). After the one-way valve is installed in its mounting hole, the outer circular raised ring (1-3) is tightly fitted with the mounting hole to isolate the space on both sides of the one-way valve's external inlet and outlet. A fixed post through hole (2-3) is provided with a fixed post through hole chamfer (2-4) at the rear end. The fixed post (2-2) is installed in the central countersunk hole (1-7). The valve plate assembly fixing device is a rivet (3). The top surface of the fixed post (2-2) abuts against the bottom surface of the central countersunk hole (1-7). The rivet shank head of the rivet (3) passes through the fixed post through hole (2-3) and the valve seat through hole (1-6) and extends into the inlet countersunk hole (1-5). The rivet (3) has a countersunk conical surface, which is pressed tightly against the fixed post through hole chamfer (2-4) at the rear end of the fixed post through hole (2-3). The rivet head of the rivet (3) is turned outward, and the bottom surface of the turned-out rivet head presses against the bottom surface of the inlet countersunk hole (1-5).

[0089] When the outlet pressure is greater than the inlet pressure, the force generated by the pressure difference on both sides of the valve plate (2-1) presses the valve plate (2-1) tightly against the top surface of the sealing boss (1-2), thus closing the one-way valve and preventing oil vapor from overflowing from the engine crankcase. When the outlet pressure of the one-way valve is less than the inlet pressure, the force generated by the pressure difference deforms the valve plate (2-1), creating a flow gap δ between it and the top surface of the sealing boss (1-2), thereby opening the one-way valve. The inlet countersunk hole (1-5) then connects to the breather pipe outside the engine crankcase. Under the action of pressure difference, the oil in the inlet countersunk hole (1-5) of the valve seat (1) flows into the engine crankcase through the flow hole (1-4) of the valve seat (1), the opening of the valve plate (2-1) and the outlet countersunk hole (1-1). The high-speed operation of the engine causes the pressure in the crankcase to change rapidly. The magnitude and direction of the force generated by the pressure difference on both sides of the valve plate (2-1) change with the pressure change in the crankcase, thereby automatically controlling the opening and closing of the valve plate (2-1).

[0090] In another preferred embodiment,

[0091] See appendix Figures 1 to 3 The cross-sectional thickness of the valve plate (2-1) gradually increases from the outer edge to the center, and a transverse hole (1-8) is provided on the wall of the outlet countersunk hole (1-1).

[0092] The cross-sectional thickness of the valve plate (2-1) gradually increases from its outer edge to its center. This structure ensures sufficient structural strength for the valve plate (2-1) to open the check valve due to elastic deformation at its outer edge, guaranteeing its operational reliability. Furthermore, when replacing the check valve, the caliper hook can be easily inserted into the transverse hole (1-8) on the wall of the outlet countersunk hole (1-1) and pulled outwards to conveniently remove the check valve from its mounting hole.

[0093] It should be noted that, Figure 4 This is a 3D schematic diagram of a one-way valve according to an embodiment of the present invention, which can be referred to in conjunction with other accompanying drawings.

[0094] In another preferred embodiment,

[0095] A one-way valve includes a valve seat (1), a valve plate assembly (2), and a rivet (3). The bottom of the valve seat (1) has an outlet countersunk hole (1-1), and a sealing boss (1-2) is provided on the bottom surface of the outlet countersunk hole (1-1). A raised ring (1-3) is provided on the outer circular surface of the valve seat (1). An overflow hole (1-4) is provided inside the valve seat (1). The top of the valve seat (1) has an inlet countersunk hole (1-5). A through hole (1-6) is provided at the axial center of the bottom surface of the inlet countersunk hole (1-5). A countersunk hole (1-7) connecting the axial through hole (1-6) is provided at the center of the bottom surface of the outlet countersunk hole (1-1) of the valve seat (1). The hole of the outlet countersunk hole (1-1) of the valve seat (1)... A transverse hole (1-8) is provided on the wall. A valve plate fixing post (2-2) is provided at the axis of the valve plate assembly (2). The valve plate (2-1) on the valve plate assembly (2) is integrated with the valve plate fixing post (2-2). A through hole (2-3) is provided at the axis of the valve plate fixing post (2-2) of the valve plate assembly (2). A chamfer (2-4) is provided at the rear end of the through hole (2-3) at the axis of the valve plate fixing post (2-2) of the valve plate assembly (2). The valve plate fixing post (2-2) of the valve plate assembly (2) is installed in the center countersunk hole (1-7) at the bottom of the valve seat (1). The top surface of the valve plate fixing post (2-2) of the valve plate assembly (2) abuts against the bottom surface of the center countersunk hole (1-7) at the bottom of the valve seat (1). The valve plate (2-1) on the valve plate assembly (2-8) is integrated with the valve plate fixing post (2-2) of the valve plate assembly (2). The cross-sectional thickness of the valve plate (2-1) gradually increases from the outer edge to the center, so that the cross-sectional stress load of the valve plate (2-1) is evenly distributed, ensuring the working reliability of the valve plate (2-1). The rivet head of the rivet (3) passes through the axial through hole (2-3) of the valve plate fixing column (2-2) of the valve plate assembly (2) and the axial through hole (1-6) of the valve seat (1) and then extends into the inlet countersunk hole (1-5) of the valve seat (1). The countersunk conical surface of the rivet (3) is pressed tightly against the chamfer (2-4) at the rear end of the axial through hole (2-3) of the valve plate fixing column (2-2) of the valve plate assembly (2). The rivet head of the rivet (3) is turned outward, and the bottom surface of the turned-out rivet head of the rivet (3) is pressed against the inlet of the valve seat (1). On the bottom surface of the countersunk hole (1-5), the outer convex ring (1-3) of the valve seat (1) fits tightly with the mounting hole after the check valve is installed in it, thus isolating the space on both sides of the external inlet and outlet of the check valve. When the outlet pressure is greater than the inlet pressure, the force generated by the pressure difference on both sides of the valve plate (2-1) presses the valve plate (2-1) tightly against the top surface of the sealing boss (1-2) of the valve seat (1), thereby closing the check valve and preventing oil vapor from overflowing from the engine crankcase. When the outlet pressure of the check valve is less than the inlet pressure, the force generated by the pressure difference deforms the valve plate (2-1) and causes it to leave the top surface of the sealing boss (1-2) of the valve seat (1), thus opening the check valve. The countersunk hole (1-5) of the valve seat (1) is connected to the breather pipe outside the engine crankcase.Under the action of pressure differential, the oil in the inlet countersunk hole (1-5) of the valve seat (1) flows into the engine crankcase through the flow hole (1-4) of the valve seat (1), the opening of the valve plate (2-1), and the bottom outlet countersunk hole (1-1) of the valve seat (1), realizing the return of oil outside the crankcase to the crankcase. The high-speed operation of the engine causes the pressure inside the crankcase to change rapidly between positive and negative pressure. The force generated by the pressure difference on both sides of the valve plate (2-1) changes in magnitude and direction with the pressure change inside the crankcase, thereby automatically controlling the opening and closing of the valve plate (2-1). In addition, when it is necessary to replace the check valve, the check valve can be easily removed from its mounting hole by inserting the caliper hook into the transverse hole (1-8) on the wall of the outlet countersunk hole (1-1) of the valve seat (1) and pulling it outward.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A check valve having a split-type valve plate assembly, characterized in that: The one-way valve includes a valve seat (1) and a split valve plate assembly. The valve seat (1) is provided with an inlet countersunk hole (1-5) at the top and an outlet countersunk hole (1-1) at the bottom. A sealing boss (1-2) is provided on the bottom surface of the outlet countersunk hole (1-1). The split valve plate assembly includes a valve plate assembly (2) and a valve plate assembly fixing device; in, The valve plate assembly (2) includes a valve plate (2-1), a fixing post (2-2) disposed at the axis of the valve plate assembly (2), and a fixing post through hole (2-3) disposed at the axis of the fixing post (2-2). The valve plate (2-1) and the fixing post (2-2) are an integral structure. When the outlet pressure of the one-way valve is greater than the inlet pressure, the force generated by the pressure difference between the two sides presses the valve plate (2-1) in the split valve plate assembly tightly against the top surface of the sealing boss (1-2), thereby closing the one-way valve and preventing oil vapor from leaking out of the engine crankcase. When the outlet pressure of the check valve is less than the inlet pressure, the force generated by the pressure difference between the two sides causes the valve plate (2-1) in the split valve plate assembly to leave the top surface of the sealing boss (1-2), thereby opening the check valve and allowing the oil outside the crankcase to flow back into the crankcase. The high-speed operation of the engine causes the pressure in the crankcase to change rapidly between positive and negative pressure. The pressure difference on both sides of the one-way valve causes the magnitude and direction of the force on the split valve plate assembly to change with the pressure change in the crankcase, thereby automatically controlling the opening and closing of the one-way valve. in, A valve seat through hole (1-6) is provided at the bottom center of the inlet countersunk hole (1-5), and a central countersunk hole (1-7) connecting the valve seat through hole (1-6) is provided at the bottom center of the outlet countersunk hole (1-1). The rear end of the through hole (2-3) of the fixing post is provided with a chamfer (2-4), and the fixing post (2-2) is installed in the central countersunk hole (1-7); The valve plate assembly fixing device is a rivet (3). The top surface of the fixed column (2-2) abuts against the bottom surface of the central countersunk hole (1-7), and the head of the rivet rod of the rivet (3) passes through the through hole (2-3) of the fixed column and the through hole (1-6) of the valve seat and then extends into the inlet countersunk hole (1-5); The rivet (3) has a countersunk conical surface, which is pressed tightly against the chamfer (2-4) of the fixing post through hole (2-3) at the rear end; The rivet head of the rivet (3) is turned outward, and the bottom surface of the turned-out rivet head presses against the bottom surface of the inlet countersunk hole (1-5); The outlet countersunk hole (1-1) has a transverse hole (1-8) on its wall. When it is necessary to replace the check valve, the check valve can be easily removed from its mounting hole by inserting the hook of the caliper into the transverse hole (1-8) on the wall of the outlet countersunk hole (1-1) and pulling it outward.

2. A check valve with a split valve plate assembly according to claim 1, characterized in that, The valve seat (1) is provided with overflow holes (1-4) inside.

3. A check valve with a split valve plate assembly according to claim 2, characterized in that: The cross-sectional thickness of the valve plate (2-1) gradually increases from the outer edge to the center.

4. A check valve with a split valve plate assembly according to claim 1, characterized in that: A raised ring (1-3) is provided on the outer circular surface of the valve seat (1).

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