Threaded plug check valve

Abstract

The utility model discloses a threaded plug-in check valve relates to hydraulic control valve technical field, wherein, threaded plug-in check valve, including valve cover and valve cover, the utility model discloses a technical scheme is set up through the oil flow hole on the valve cover to make the oil passage and the oil flow hole form the pipeline of oil liquid flow along the extension direction of the pipeline, and the valve core is opposite the oil inlet hole, and make the valve core can move under the impact of oil liquid and make the through -going of oil liquid passage, simultaneously when the valve core does not receive the oil liquid impact, the valve core can reset under the action of elastic member and cut off the oil liquid passage again, to make the valve core can stably realize the on-off control to the oil liquid passage under the flow impact, guarantee the stability of check valve operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valve technology, and in particular to a threaded cartridge check valve. Background Technology

[0002] One-way valves are commonly used directional control components in hydraulic systems. They are typically installed in the oil passage using a threaded connection. Oil flows into the valve from one end and out from the other end in the forward direction, or is cut off in the reverse direction, thus achieving the one-way flow function.

[0003] In related technologies, threaded cartridge check valves have a compact structure, but due to structural strength, their resistance to flow shock is poor. Logic cartridge valves, when used as seated check valves, have good structural reliability, but the oil flow direction after being guided by them is mostly right-angled, and they cannot be directly applied to structures where the oil flows in a straight direction. Therefore, it is necessary to provide a check valve structure that can allow the oil to flow in a straight direction and has high structural strength. Utility Model Content

[0004] The main purpose of this invention is to propose a threaded cartridge check valve, which aims to solve the problem of low structural strength and poor resistance to flow shock in threaded cartridge check valves.

[0005] To achieve the above objectives, the present invention proposes a threaded cartridge check valve, comprising: A valve sleeve, in which a valve core is installed, and an oil inlet and an oil outlet are provided on the valve sleeve, forming an oil passage between the oil inlet and the oil outlet; A valve cover, which is fitted onto one end of the valve sleeve and encloses the valve core inside the valve sleeve, and the valve cover is provided with a flow oil hole that communicates with the oil outlet hole; An elastic element is provided between the valve core and the valve cover. The valve core slides within the valve sleeve under the action of the elastic element, so that the valve core controls the opening and closing of the oil passage.

[0006] In one embodiment, the valve sleeve has a sliding cavity extending along the axial direction of the valve sleeve, the sliding cavity is connected to the oil inlet hole, and the valve core slides along the axial direction of the valve sleeve and extends into the oil passage to cut off the oil passage.

[0007] In one embodiment, the valve core extends along the axial direction of the valve sleeve, and the outer peripheral surface of the valve core is in contact with the inner peripheral wall of the sliding cavity.

[0008] In one embodiment, the valve core has a receiving cavity with an opening communicating with the sliding cavity, the elastic element extends into the receiving cavity and abuts against the valve core, and the elastic element abuts against the valve cover.

[0009] In one embodiment, the valve cover is provided with a plurality of pilot oil holes, the plurality of pilot oil holes being disposed on the portion of the valve core projected onto the valve cover, and the pilot oil holes communicating with the sliding cavity.

[0010] In one embodiment, the oil inlet hole is provided with a first step portion, which is arranged along the inner peripheral wall of the oil inlet hole. The valve core abuts against the first step portion to cut off the oil passage.

[0011] In one embodiment, the valve sleeve is provided with a sealing part, which is configured such that when the sealing part and the valve cover are disposed in the pipeline, the sealing part, the valve cover and the valve sleeve together form a flow cavity, and the flow cavity communicates with the oil outlet and the flow oil hole.

[0012] In one embodiment, a plurality of flow oil holes are provided, the plurality of flow oil holes extend axially along the valve sleeve, and the plurality of flow oil holes are arranged around the valve sleeve.

[0013] In one embodiment, the valve sleeve has a second step portion at one end facing the valve cover, and a third step portion is provided on the side of the valve sleeve facing the valve sleeve, with the second step portion connected to the third step portion.

[0014] In one embodiment, the valve cover is provided with a threaded portion, which is configured to be threadedly connected to a pipe.

[0015] The technical solution of this utility model involves setting a flow oil hole on the valve cover, so that the oil passage and the flow oil hole form a pipeline for oil flow along the extension direction of the pipeline, and the valve core is directly opposite the oil inlet hole. This allows the valve core to move under the impact of the oil, thus opening the oil passage. At the same time, when the valve core is not impacted by the oil, it can be reset under the action of the elastic element and cut off the oil passage again. This allows the valve core to stably control the opening and closing of the oil passage under the impact of flow, ensuring the stability of the one-way valve operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of an embodiment of the threaded cartridge check valve provided by this utility model; Figure 2This is a schematic diagram of another embodiment of the threaded cartridge check valve provided by this utility model.

[0018] Explanation of icon numbers: 10. Valve cover; 11. Threaded part; 12. Valve cover body; 13. Flow oil hole; 14. Pilot oil hole; 15. Third step part; 20. Valve sleeve; 21. Sliding cavity; 22. Valve core; 23. Elastic element; 24. Oil outlet hole; 25. First step part; 26. Oil inlet hole; 27. Sealing part; 31. Flow cavity.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] One-way valves are commonly used directional control components in hydraulic systems. They are typically installed in the oil passage using a threaded connection. Oil flows into the valve from one end and out from the other end in the forward direction, or is cut off in the reverse direction, thus achieving the one-way flow function.

[0024] In related technologies, threaded cartridge check valves have a compact structure, but due to structural strength, their resistance to flow shock is poor. Logic cartridge valves, when used as seated check valves, have good structural reliability, but the oil flow direction after being guided by them is mostly right-angled, and they cannot be directly applied to structures where the oil flows in a straight direction. Therefore, it is necessary to provide a check valve structure that can allow the oil to flow in a straight direction and has high structural strength.

[0025] This utility model proposes a threaded cartridge check valve.

[0026] Please see Figure 1 In one embodiment of this utility model, the threaded cartridge check valve includes: Valve sleeve 20, valve core 22 is installed inside valve sleeve 20, and oil inlet hole 26 and oil outlet hole 24 are provided on valve sleeve 20, forming an oil passage between oil inlet hole 26 and oil outlet hole 24. Valve cover 10, valve cover 10 is sleeved on one end of valve sleeve 20 and the valve core 22 is sealed inside valve sleeve 20. Valve cover 10 is provided with oil passage hole 13, and oil passage hole 13 is connected to oil outlet hole 24. Among them, an elastic element 23 is provided between the valve core 22 and the valve cover 10. The valve core 22 slides in the valve sleeve 20 under the action of the elastic element 23 so that the valve core 22 controls the opening and closing of the oil passage.

[0027] like Figure 2 As shown, the valve cover 10 is used to connect to the pipe and divide the pipe into two parts.

[0028] It is understandable that when the valve sleeve 20 is inserted into the pipeline, the valve cover 10 divides the pipeline into sections, and with the cooperation of the valve sleeve 20, the liquid in the pipeline can flow in one direction.

[0029] like Figure 1 As shown, the valve sleeve 20 is provided with an oil inlet hole 26 and an oil outlet hole 24, forming an oil passage between the oil inlet hole 26 and the oil outlet hole 24, and the valve cover 10 is provided with a flow oil hole 13, which connects the oil passage to the flow oil hole 13.

[0030] It is understandable that when the valve sleeve 20 and the valve cover 10 are inserted into the pipeline, the liquid in the pipeline flows through the oil passage and the flow oil hole 13 to the areas on both sides of the valve cover 10.

[0031] A valve core 22 is slidably disposed inside the valve sleeve 20 so that when the valve core 22 slides to the first position, the oil passage is cut off, and when the valve core 22 slides to the second position, the oil passage is opened, and the oil flows from the oil inlet 26 to the oil outlet 24.

[0032] It is understandable that when the oil enters the valve sleeve 20 from the oil inlet 26, if the valve core 22 is in the second position, the oil can flow along the oil channel to the oil outlet 24, and then flow through the flow oil hole 13 to the other side of the valve cover 10. If the valve core 22 is in the first position, the oil channel is cut off, so that the oil cannot enter the oil outlet 24 through the oil inlet 26, thereby realizing the one-way flow of the valve body.

[0033] It should be noted that the valve core 22 moves from the second position to the first position by the oil pressure pushing the valve core 22 to move when the oil enters the oil passage from the oil inlet 26. The movement of the valve core 22 makes the oil passage open.

[0034] In order to facilitate the valve core 22 to reset from the first position to the second position so that the valve core 22 can cut off the oil passage again, an elastic element 23 is provided in the valve sleeve 20. When the valve core 22 moves from the second position to the first position, the elastic element 23 is compressed. When the oil no longer flows from the oil inlet 26 to the oil outlet 24, the elastic element 23 releases its elastic force so that the valve core 22 moves to cut off the oil passage again.

[0035] In one embodiment, the elastic element 23 is a spring.

[0036] Preferably, the elastic element 23 is always in a compressed state so that when the valve core 22 is in the first position, the elastic element 23 presses against the valve core 22 to ensure the valve core 22's cut-off effect on the oil passage.

[0037] like Figure 1 As shown, the oil passage is connected to the flow oil hole 13. When the oil flows in the oil passage and the flow oil hole 13, it can flow along the extension direction of the pipeline.

[0038] The technical solution of this utility model is to provide a flow oil hole 13 on the valve cover 10 so that the oil passage and the flow oil hole 13 form a pipeline for oil flow along the extension direction of the pipeline, and the valve core 22 is directly opposite the oil inlet hole 26, so that the valve core 22 can move under the impact of the oil to make the oil passage open. At the same time, when the valve core 22 is not impacted by the oil, the valve core 22 can be reset under the action of the elastic element 23 and cut off the oil passage again, so that the valve core 22 can stably realize the opening and closing control of the oil passage under the flow impact, ensuring the stability of the one-way valve operation.

[0039] In one embodiment, the valve sleeve 20 is provided with a sliding cavity 21 extending in the axial direction of the valve sleeve 20. The sliding cavity 21 is connected to the oil inlet hole 26. The valve core 22 slides in the axial direction of the valve sleeve 20 and extends into the oil passage to cut off the oil passage.

[0040] like Figure 2As shown, the valve sleeve 20 is located at the center of the valve cover 10, and when the check valve is installed in the pipeline, the valve sleeve 20 extends along the extension direction of the pipeline.

[0041] This allows the valve core 22 to move within the valve sleeve 20 along the extension direction of the pipeline, and the sliding cavity 21 is connected to the oil inlet 26. This facilitates the valve core 22 to stably cut off the oil passage or make the oil passage open when it moves along the sliding cavity 21.

[0042] It is understandable that the valve sleeve 20 extending along the pipeline and the sliding cavity 21 extending along the axial direction of the valve sleeve enable the valve core 22 to move along the axial direction of the valve sleeve 20. This allows the valve core 22 to directly face the impact of the oil flow from the oil inlet 26, thus enabling the valve core 22 to move stably in the axial direction of the valve sleeve 20. This ensures the normal blocking function of the valve core 22 while improving its impact resistance.

[0043] In one embodiment, the valve core 22 extends along the axial direction of the valve sleeve 20, and the outer peripheral surface of the valve core 22 is in contact with the inner peripheral wall of the sliding cavity 21.

[0044] Understandably, the outer peripheral surface of the valve core 22 is in contact with the inner peripheral wall of the sliding cavity 21. Thus, when the valve core 22 moves within the sliding cavity 21, it remains in contact with the inner peripheral wall of the sliding cavity 21 throughout its movement. This reduces the gap between the valve core 22 and the inner peripheral wall of the sliding cavity 21, thereby preventing the valve core 22 from becoming misaligned and causing it to jam when subjected to flow impact.

[0045] Furthermore, in order to improve the response efficiency of the valve core 22, the vertical cross-section of the sliding cavity 21 is circular, and the vertical cross-section of the valve core is also circular.

[0046] It is understandable that the cylindrical valve core 22 and the cylindrical sliding cavity 21 that cooperate with it reduce the restriction of the sliding cavity 21 on the movement of the valve core 22, so that when the oil impacts the force surface of the valve core 22, the valve core 22 can respond quickly to the movement, so as to ensure the rapid passage of oil.

[0047] In one embodiment, the valve core 22 has a receiving cavity with an opening communicating with the sliding cavity 21. The elastic member 23 extends into the receiving cavity and abuts against the valve core 22. The elastic member 23 abuts against the valve cover 10.

[0048] In order to improve the effect of the sliding cavity 21 on restricting the movement of the valve core 22, the length of the valve core 22 needs to be increased. However, extending the length of the valve core 22 is not conducive to the fitting and installation of the elastic element 23.

[0049] like Figure 1As shown, the valve core 22 has a receiving cavity with an opening facing the valve cover 10. The elastic element 23 installed in the sliding cavity 21 extends into the receiving cavity and abuts against the side wall of the receiving cavity, that is, abuts against the valve core 22.

[0050] It is understandable that the valve core 22, which extends axially from the valve sleeve 20, increases the contact area with the side wall of the sliding cavity 21 to ensure the limiting effect of the sliding cavity 21 during the sliding process of the valve core 22. At the same time, after the elastic element 23 is partially set inside the valve core 22, the elastic element 23 is restricted by the receiving cavity, so that when the elastic element 23 outputs to the valve core 22, the valve core 22 can be guaranteed to move axially.

[0051] In another embodiment, the sidewall of the receiving cavity contacts the side of the elastic element, thereby restricting the elastic element through the receiving cavity. During the process of the elastic element outputting power, the direction of the power output of the elastic element is restricted, thereby ensuring the stability of the direction of the elastic force release during the release of the elastic force, and thus ensuring the stability of the movement direction of the valve core 22.

[0052] In one embodiment, the valve cover 10 is provided with a plurality of pilot oil holes 14, which are disposed on the portion of the valve core 22 projected onto the valve cover 10, and the pilot oil holes 14 are connected to the sliding cavity 21.

[0053] like Figure 1 As shown, a pilot oil hole 14 is provided on the valve cover 10, and the pilot oil hole 14 is connected to the sliding cavity 21 and the receiving cavity.

[0054] It should be noted that when the check valve is installed in the pipeline, the valve cover 10 divides the pipeline into two areas so that the pipeline can impact the check valve from two directions.

[0055] It is understandable that, such as Figure 1 As shown, when the liquid flows from the left side of the valve cover 10 to the right side of the valve cover 10, the liquid impacts the valve core 22 through the oil inlet hole 26, causing the valve core 22 to move along the axial direction of the valve sleeve 20 and compress the elastic element 23. At this time, the oil inlet hole 26 connects to the oil outlet hole 24, and then the liquid flows to the right side of the valve cover 10 through the oil inlet hole 26, the oil outlet hole 24 and the flow oil hole 13, thereby realizing the flow of liquid from the left side to the right side of the valve cover 10.

[0056] It is understandable that, such as Figure 1As shown, when the liquid flows from the right side of the valve cover 10 to the left side of the valve cover 10, the liquid passes through the flow oil hole 13 and the pilot oil hole 14 through the valve cover. At this time, the liquid flowing through the pilot oil hole 14 enters the receiving cavity, thereby pushing the valve core 22 to move to the left. At the same time, the elastic element 23 releases its elastic force, synchronously driving the valve core 22 to move, thereby causing the valve core 22 to quickly cut off the connection between the oil inlet hole 26 and the oil outlet hole 24, thereby preventing the liquid from flowing through the oil outlet hole 24 and the oil inlet hole 26, thus achieving the flow cut-off of the liquid.

[0057] It should be noted that the pilot oil hole 14 allows liquid to enter the receiving chamber through the pilot oil hole 14, thereby driving the movement of the valve core 22.

[0058] Understandably, by setting the pilot oil hole 14, even if the elastic element 23 fails, the valve core 22 can still move in the sliding cavity, thereby improving the fault tolerance of the check valve.

[0059] In another embodiment, the elastic element 23 is not provided in the receiving cavity. With the oil inlet 26 and the pilot oil inlet 14, the valve core 22 can be subjected to liquid pressure in both directions, thereby moving and thus cutting off the oil passage or opening the oil passage.

[0060] Understandably, by utilizing liquid pressure to control the movement of the valve core 22, mechanical moving parts (elastic components) are eliminated, thereby avoiding mechanical wear and improving the service life of the check valve.

[0061] Furthermore, such as Figure 1 As shown, the oil inlet 26 is located on the left side of the valve sleeve 20, while the oil outlet 24 is located on the lower side of the valve sleeve 20. Multiple flow oil holes 13 are provided on the valve cover 10. In this way, liquid can pass through the oil inlet 26, the oil outlet 24, and the flow oil holes 13, thereby realizing the straight flow of liquid in the pipeline. This improves the impact resistance of the check valve and realizes the straight flow of liquid in the pipeline, thus ensuring the applicability range of the check valve.

[0062] It should be noted that the size of the pilot oil hole 14 is smaller than the wire diameter of the elastic element 23.

[0063] Understandably, by restricting the pilot oil hole 14, even if the elastic element 23 is damaged and broken, the broken parts will not enter the pipeline through the pilot oil hole 14, thus avoiding the impact of the broken parts on the quality of the liquid in the pipeline.

[0064] In one embodiment, the oil inlet 26 is provided with a first step 25, which is arranged along the inner peripheral wall of the oil inlet 26. The valve core 22 abuts against the first step 25 to cut off the oil passage.

[0065] like Figure 1 As shown, the inner peripheral wall of the oil inlet 26 is connected to the inner peripheral wall of the sliding cavity through the first step 25. When the valve core 22 moves to the first position, the valve core 22 abuts against the first step 25 to cut off the oil passage. When the valve core 22 moves to the second position, the valve core 22 disengages from the abutment with the first step 25, thereby facilitating the passage of oil.

[0066] It is understandable that by setting the first step 25 so that it abuts against the valve core 22, the oil passage is cut off. Liquid enters the oil passage through the oil inlet 26. The setting of the first step 25 avoids the liquid directly impacting the first step 25 and causing damage to the contact surface of the first step 25, thereby ensuring the cut-off sealing quality when the valve core 22 abuts against the first step 25.

[0067] Preferably, a fourth step is provided on the side of the valve core 22 and the first step 25, and the fourth step abuts against the first step 25.

[0068] Meanwhile, the fourth step is located on the peripheral edge of the valve core 22.

[0069] It is understandable that the part of the valve core 22 that abuts against the first step 25 is the fourth step. This is so that when liquid enters the oil passage through the oil inlet 26, the liquid directly impacts the side of the valve core 22 and does not directly impact the fourth step, thereby reducing the damage to the fourth step due to the impact and ensuring the sealing quality when the fourth step abuts against the first step 25.

[0070] In another embodiment, the first step portion 25 is an annular inclined surface, and the surface of the fourth step portion is an annular inclined surface. The two annular inclined surfaces directly abut against each other to ensure a sealing effect. Furthermore, the two annular inclined surfaces enable the flow of liquid in the oil channel.

[0071] In another embodiment, an annular arc surface is provided on the first step portion and an annular arc surface is provided on the fourth step portion. When the two annular arc surfaces come into contact, the sealing effect is further improved by increasing the contact area.

[0072] In one embodiment, the valve sleeve 20 is provided with a sealing part 27. When the sealing part 27 and the valve cover 10 are disposed in the pipeline, the sealing part 27, the valve cover 10 and the valve sleeve 20 together form a flow cavity 31, and the flow cavity 31 is connected to the oil outlet 24 and the flow oil hole 13.

[0073] To prevent the liquid flowing out of the oil outlet 24 from flowing back, a sealing part 27 is provided on the valve sleeve 20, and the sealing part 27 is located on the side of the oil outlet 24 away from the valve cover 10.

[0074] When the one-way valve is installed in the pipeline, the sealing part 27 abuts against the inner wall of the pipeline, thereby cooperating with the valve cover 10 to form a flow cavity 31, which connects the oil outlet 24 and the flow oil outlet 13.

[0075] It is understandable that when liquid flows in from the oil inlet 26, the liquid pushes the valve core 22 to move, and facilitates the connection between the oil inlet 26 and the oil outlet 24. The liquid flows into the flow chamber 31 through the oil outlet 24 and enters the other side of the valve cover 10 through the flow oil hole 13.

[0076] When the liquid enters the flow chamber 31 through the flow oil hole 13, the liquid simultaneously enters the receiving chamber through the pilot oil hole 14, thereby pushing the valve core 22 to move and cut off the oil inlet hole 26 and the oil outlet hole 24. This prevents the liquid from flowing into the oil inlet hole 26 through the flow chamber 31 and the oil outlet hole 24, thus ensuring the one-way conduction function of the check valve.

[0077] In one embodiment, the sealing part 27 is a rubber ring.

[0078] In order to limit the position of the sealing part 27 on the valve sleeve 20, a groove is provided on the outer peripheral surface of the valve sleeve 20, and the sealing part 27 is embedded in the groove.

[0079] In one embodiment, multiple flow oil holes 13 are provided, which extend axially along the valve sleeve 20 and are arranged around the valve sleeve 20.

[0080] like Figure 2 As shown, the valve cover 10 is provided with a plurality of flow oil holes 13, and the plurality of flow oil holes 13 are arranged around the valve sleeve 20.

[0081] Because of the sealing part 27, the flow cavity 31 is arranged around the valve sleeve 20 so that each flow oil hole 13 is connected to the flow cavity 31, so that the liquid in the flow cavity 31 can flow out directly through multiple flow oil holes 13, thereby increasing the flow rate.

[0082] It is understandable that the multiple flow oil holes 13 are set up in a way that... Figure 2 As shown below, when the liquid flows from the right side to the left side of the valve cover 10, the liquid directly enters the flow chamber 31 through the flow oil hole 13, and avoids directly impacting the valve sleeve 20, thereby ensuring that the flow impact reduces damage to the valve sleeve 20.

[0083] In one embodiment, the valve sleeve 20 has a second step portion at one end facing the valve cover 10, and the valve sleeve 20 has a third step portion 15 on the side facing the valve sleeve 20, with the second step portion and the third step portion 15 connected.

[0084] It is understandable that the second step and the third step 15 are designed to facilitate the alignment between the valve sleeve 20 and the valve cover 10, thereby improving the connection efficiency between the valve sleeve 20 and the valve cover 10.

[0085] Furthermore, the valve sleeve 20 and the valve cover 10 are threaded together to facilitate the connection between the valve sleeve 20 and the valve cover 10.

[0086] In one embodiment, the valve cover 10 is provided with a threaded portion 11, which is configured to be threadedly connected to a pipe.

[0087] It is understood that the valve cover 10 includes a valve cover body 12, and a threaded portion 11 is provided on the outer circumferential surface of the valve cover body 12, so that when the one-way valve is installed in the pipeline, the valve cover 10 can be stably connected to the pipeline by rotation.

[0088] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A threaded cartridge check valve, characterized in that, include: A valve sleeve, in which a valve core is installed, and an oil inlet and an oil outlet are provided on the valve sleeve, forming an oil passage between the oil inlet and the oil outlet; A valve cover, which is fitted onto one end of the valve sleeve and encloses the valve core inside the valve sleeve, and the valve cover is provided with a flow oil hole that communicates with the oil outlet hole; An elastic element is provided between the valve core and the valve cover. The valve core slides within the valve sleeve under the action of the elastic element, so that the valve core controls the opening and closing of the oil passage.

2. The threaded cartridge check valve as described in claim 1, characterized in that, The valve sleeve has a sliding cavity extending along the axial direction of the valve sleeve. The sliding cavity is connected to the oil inlet hole. The valve core slides along the axial direction of the valve sleeve and extends into the oil passage to cut off the oil passage.

3. The threaded cartridge check valve as described in claim 2, characterized in that, The valve core extends along the axial direction of the valve sleeve, and the outer peripheral surface of the valve core is in contact with the inner peripheral wall of the sliding cavity.

4. The threaded cartridge check valve as described in claim 3, characterized in that, The valve core has a receiving cavity with an opening that connects to the sliding cavity. The elastic element extends into the receiving cavity and abuts against the valve core. The elastic element abuts against the valve cover.

5. The threaded cartridge check valve as described in claim 4, characterized in that, The valve cover is provided with a plurality of pilot oil holes, which are located on the portion of the valve core projected onto the valve cover, and the pilot oil holes are connected to the sliding cavity.

6. The threaded cartridge check valve as described in claim 2, characterized in that, The oil inlet hole is provided with a first step portion, which is arranged along the inner peripheral wall of the oil inlet hole. The valve core abuts against the first step portion to cut off the oil passage.

7. The threaded cartridge check valve as described in claim 2, characterized in that, The valve sleeve is provided with a sealing part. When the sealing part and the valve cover are disposed in the pipeline, the sealing part, the valve cover and the valve sleeve together form a flow cavity, and the flow cavity is connected to the oil outlet and the flow oil hole.

8. The threaded cartridge check valve as described in any one of claims 1 to 7, characterized in that, The valve sleeve has multiple flow holes, which extend axially along the valve sleeve and are arranged around the valve sleeve.

9. The threaded cartridge check valve as described in claim 8, characterized in that, The valve sleeve has a second step at one end facing the valve cover, and a third step at the side facing the valve sleeve, with the second step and the third step connected.

10. The threaded cartridge check valve as described in claim 8, characterized in that, The valve cover is provided with a threaded portion, which is configured to connect with a pipe thread.

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