One-way stop valve with filtering function

Abstract

The utility model discloses a one-way stop valve with a filtering function, relates to the technical field of hydraulic valve bodies, and aims to solve the problems of high cost and high leakage risk caused by connection of a plurality of valves, the one-way stop valve comprises a valve body, and the valve body is provided with an input port and an output port which are both communicated with an inner cavity of the valve body. The filter element is arranged in the inner cavity of the valve body and is close to the input port, the one-way non-return assembly is arranged in the inner cavity of the valve body and is close to the interior of the inner cavity relative to the filter element, and the one-way non-return assembly is used for controlling one-way flowing of fluid in the inner cavity of the valve body, so that the fluid flows into the inner cavity of the valve body from the input port of the valve body and flows out from the output port of the valve body; the valve rod assembly is arranged in the inner cavity of the valve body, can move in the direction close to and away from the output port and is used for controlling closing and opening of the output port, and a sealing structure is arranged in the circumferential direction of the valve rod assembly so that fluid can be prevented from flowing out of a gap between the valve rod assembly and the inner cavity of the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valve bodies, and more specifically to a one-way stop valve with a filtering function. Background Art

[0002] A one-way valve is a valve that allows fluid to flow only along the inlet, but the medium at the outlet cannot flow back. It is commonly known as a one-way valve. A one-way valve is also called a check valve or a non-return valve. It is used in hydraulic systems to prevent fluid from flowing in the opposite direction, or in pneumatic systems to prevent compressed air from flowing in the opposite direction. There are two types of one-way valves: straight-through and right-angle. Straight-through one-way valves are installed on the pipeline with threaded connections. Right-angle one-way valves are available in three types: threaded connection, plate connection, and flange connection.

[0003] Many oil holes in the hydraulic systems of large excavators, cranes and other machinery need to be connected to other equipment through one-way valves. One-way valves can be used to control the on-off of the oil circuit system of hydraulic machinery to achieve one-way conduction. However, since the oil in the hydraulic machinery is constantly flowing in various equipment, it is attached with a lot of impurities. It is very troublesome to disassemble and clean large hydraulic equipment, which requires a lot of manpower. Although the existing one-way valve can prevent backflow, its function is relatively single and it cannot filter the contaminated oil entering the valve body, which can easily cause the valve core to be blocked, affecting the normal operation of the system and even causing subsequent equipment failures.

[0004] With the rapid development of technologies such as new energy vehicles and the hydrogen industry, there is an increasing concern about the leakage of pressure systems. How to reduce the leakage rate and how to reduce the leakage points have become issues of particular importance in the industry. Currently, filters, one-way valves and stop valves are usually required to connect the system pipelines from the pressure source in the market. Currently, filters, one-way valves and stop valves are mostly single-function designs. When connecting the system pipelines, three valves need to be connected at the same time, resulting in the disadvantages of large space occupation and high cost. In addition, the connection is complex, there are many leakage points and the risk of leakage is also high.

[0005] Therefore, how to solve the problem of high cost and high leakage risk caused by connecting multiple valves is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a one-way stop valve with a filtering function, which integrates a filter, a one-way valve and a stop valve into one. Only by installing one valve, the functions of filtering fluid, controlling the one-way flow of fluid and cutting off the flow of fluid can be realized, which can reduce the risk of leakage caused by connecting multiple valves and reduce the cost caused by producing multiple valves.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A one-way stop valve with filtering function, comprising:

[0009] A valve body, wherein the valve body is provided with an input port and an output port, and the input port and the output port are both communicated with the inner cavity of the valve body;

[0010] A filter element is arranged in the inner cavity of the valve body, and the filter element is arranged close to the input port;

[0011] A one-way check assembly is arranged in the inner cavity of the valve body. The one-way check assembly is arranged inside the inner cavity of the filter element and is used to control the one-way flow of the fluid in the inner cavity of the valve body, so that the fluid flows into the inner cavity of the valve body from the input port of the valve body and flows out from the output port of the valve body.

[0012] The valve stem assembly is arranged in the inner cavity of the valve body. The valve stem assembly is movably arranged in the direction close to and away from the output port, and is used to control the closing and opening of the output port. A sealing structure is arranged around the valve stem assembly.

[0013] Preferably, the one-way check assembly comprises:

[0014] The valve seat is arranged at the input port through a first gland, the valve seat has a long hole in the middle, and the filter element is arranged in the long hole;

[0015] A sliding sleeve, one end of which is embedded in the end of the long hole, the other end of which is provided with a mounting groove, and a water inlet hole connected to the mounting groove is provided in the circumference of the sliding sleeve;

[0016] A spring, one end of which is arranged in the mounting groove, and the other end of which abuts against a spring seat in the inner cavity of the valve body.

[0017] Preferably, an O-ring is provided on the outer periphery of the sliding sleeve to seal the sliding sleeve and the valve seat.

[0018] Preferably, the valve stem assembly comprises:

[0019] An upper valve stem rotatably disposed on the valve body;

[0020] The lower valve stem is nested in the end of the upper valve stem, the lower valve stem is rotatably connected to the upper valve stem, the lower valve stem is located in the inner cavity of the valve body, and the lower valve stem is arranged to move along the axial direction of the valve body.

[0021] Preferably, one end of the upper valve stem away from the lower valve stem is nested in the handle, and the upper valve stem is fixed to the handle by a set screw.

[0022] Preferably, the inner cavity of the valve body is provided with a step groove for installing a sealing structure, and the sealing structure is a packing assembly, which includes a packing pad, a packing, a packing retaining ring and a packing pressure pad arranged along the axial direction of the lower valve stem and in the circumferential direction of the lower valve stem, the packing pressure pad is arranged at the bottom of the step groove, the packing pad is arranged at the end of the upper valve stem, the packing is arranged between the packing pressure pad and the packing pad, and packing retaining rings are provided on both end surfaces of the packing.

[0023] Preferably, a packing gland threadedly connected to the step groove is provided on the circumference of the upper valve stem, and the packing gland abuts against the packing pressure pad.

[0024] Preferably, the outer peripheral sleeve of the packing gland is provided with an anti-loosening sheet.

[0025] Preferably, a support ring abutting against the valve body is provided at the bottom end of the anti-loosening plate, and the support ring and the anti-loosening plate are fixed to the valve body by locking screws.

[0026] Preferably, the output port is provided with a second gland and a screw sleeve for installing the pipeline, and the first gland is also provided with a second gland and a screw sleeve.

[0027] The one-way stop valve with filtering function provided by the utility model comprises a valve body, a filter element, a one-way check assembly and a valve stem assembly. Specifically, the valve body is provided with an input port and an output port, and the input port and the output port are both connected with the inner cavity of the valve body. The fluid enters the inner cavity of the valve body from the input port of the valve body, and then flows out through the output port of the valve body. The filter element is arranged in the inner cavity of the valve body and is arranged close to the input port. The fluid entering the valve body through the input port of the valve body is filtered by the filter element. The one-way check assembly is arranged in the inner cavity of the valve body and is arranged inside the inner cavity relative to the filter element. The one-way check assembly is used to control the one-way flow of the fluid in the inner cavity of the valve body, so that the fluid flows into the inner cavity of the valve body from the input port of the valve body and flows out from the output port of the valve body. The filtered fluid will only flow in one direction through the control of the one-way check assembly, and the fluid backflow can be avoided.

[0028] The valve stem assembly is arranged in the inner cavity of the valve body and is movably arranged in the direction close to and away from the output port, and is used to control the closing and opening of the output port. When the fluid needs to flow out from the output port, the valve stem assembly is controlled to move in the direction away from the output port to control the output port to open. When the outflow of the fluid needs to be cut off, the valve stem assembly is controlled to move in the direction close to the output port to control the output port to close, thereby achieving the purpose of cut-off. A sealing structure is provided in the circumference of the valve stem assembly to prevent the fluid from flowing out from the gap between the valve stem assembly and the inner cavity of the valve body.

[0029] The one-way stop valve with filtering function arranged in the above manner integrates the filter, the one-way valve and the stop valve into one, and the functions of filtering the fluid, controlling the one-way flow of the fluid and cutting off the flow of the fluid can be achieved by installing only one valve. The existing valves have a single function, and when multiple functions need to be achieved, multiple valves need to be connected. The connection of multiple valves will generate leakage risks and increase costs. The valve arranged in the present application can reduce leakage risks and costs while achieving multiple functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 This is a structural schematic diagram of a one-way stop valve with filtering function provided by the utility model.

[0032] Reference numerals:

[0033] 1- Valve body;

[0034] 2-Filter element;

[0035] 3-one-way check assembly, 31-valve seat, 32-first gland, 33-sleeve, 34-spring, 35-O-ring;

[0036] 4-valve stem assembly, 41-upper valve stem, 42-lower valve stem;

[0037] 5-sealing structure, 51-packing pad, 52-packing, 53-packing retaining ring, 54-packing pressure pad, 55-packing gland;

[0038] 6-Handle;

[0039] 7-Set screw;

[0040] 8- Anti-loosening piece;

[0041] 9- support ring;

[0042] 10-locking screw;

[0043] 11- second gland;

[0044] 12-Threaded sleeve. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] It should be noted that the directional words such as "upper" and "lower" mentioned below are defined based on the drawings in the specification.

[0047] The core of the utility model is to provide a one-way stop valve with a filtering function, which integrates a filter, a one-way valve and a stop valve into one. Only by installing one valve can the functions of filtering fluid, controlling the one-way flow of fluid and cutting off the flow of fluid be realized, which can reduce the risk of leakage caused by connecting multiple valves and reduce the cost caused by producing multiple valves.

[0048] Please refer to Figure 1 A one-way stop valve with filtering function comprises a valve body 1, a filter element 2, a one-way check assembly 3 and a valve stem assembly 4.

[0049] Specifically, the valve body 1 is provided with an input port and an output port, and the input port and the output port are both connected to the inner cavity of the valve body 1. The fluid enters the inner cavity of the valve body 1 from the input port of the valve body 1, and then flows out through the output port of the valve body 1. The filter element 2 is arranged in the inner cavity of the valve body 1 and is arranged close to the input port. The fluid entering the valve body 1 through the input port of the valve body 1 is filtered by the filter element 2. The one-way check assembly 3 is arranged in the inner cavity of the valve body 1 and is arranged inside the inner cavity close to the filter element 2. The one-way check assembly 3 is used to control the one-way flow of the inner cavity fluid of the valve body 1, so that the fluid flows into the inner cavity of the valve body 1 from the input port of the valve body 1 and flows out from the output port of the valve body 1. The filtered fluid will only flow in one direction through the control of the one-way check assembly 3, which can avoid the occurrence of fluid backflow.

[0050] The valve stem assembly 4 is arranged in the inner cavity of the valve body 1 and is movably arranged in the direction close to and away from the output port, and is used to control the closing and opening of the output port. When the fluid needs to flow out from the output port, the valve stem assembly 4 is controlled to move in the direction away from the output port to control the output port to open. When the outflow of the fluid needs to be cut off, the valve stem assembly 4 is controlled to move in the direction close to the output port to control the output port to close, so as to achieve the purpose of cut-off. A sealing structure 5 is provided around the valve stem assembly 4 to prevent the fluid from flowing out from the gap between the valve stem assembly 4 and the inner cavity of the valve body 1.

[0051] The one-way stop valve with filtering function arranged in the above manner integrates the filter, the one-way valve and the stop valve into one, and the functions of filtering the fluid, controlling the one-way flow of the fluid and cutting off the flow of the fluid can be achieved by installing only one valve. The existing valves have a single function, and when multiple functions need to be achieved, multiple valves need to be connected. The connection of multiple valves will generate leakage risks and increase costs. The valve arranged in the present application can reduce leakage risks and costs while achieving multiple functions.

[0052] In the above embodiment, the one-way check assembly 3 includes a valve seat 31, a sleeve 33 and a spring 34. The valve seat 31 is arranged at the input port through the first pressure cover 32 so that the valve seat 31 is pressed against the input port of the valve body 1. The valve seat 31 has a long hole in the middle, the filter element 2 is arranged in the long hole, one end of the sleeve 33 is nested in the end of the long hole, the other end of the sleeve 33 is provided with a mounting groove, the circumference of the sleeve 33 is provided with a water inlet hole connected to the mounting groove, one end of the spring 34 is arranged in the mounting groove, and the other end of the spring 34 abuts against the spring 34 seat in the inner cavity of the valve body 1.

[0053] It should be noted that the inner cavity of the valve body 1 is processed with a spring 34 seat for placing the spring 34, so that one end of the spring 34 abuts against the spring 34 seat, and the other end supports the sleeve 33. When the fluid flows into the inner cavity of the valve body 1 from the long hole of the valve seat 31, it is first filtered through the filter element 2 to filter the fluid entering the inner cavity of the valve body 1. Then, the sleeve 33 is separated from the valve seat 31 under the pressure of the fluid, so that the fluid flows into the inner cavity of the valve body 1 from the gap between the sleeve 33 and the valve seat 31, and then enters the installation groove of the sleeve 33 from the water inlet hole of the sleeve 33, flows into the spring 34 seat through the installation groove, and finally flows out from the output port after the output port is opened.

[0054] Among them, in this embodiment, the input port is arranged at the bottom of the valve body 1, and the output port is arranged around the valve body 1. However, in actual application, there is no restriction on the position of the input port and the output port as long as the above-mentioned technical effect can be achieved.

[0055] In one embodiment, a new port may be added to the circumference or top of the valve body 1, and the one-way check assembly 3 for realizing the check function may be installed to the newly added port to realize the one-way check function for the fluid.

[0056] In the above case, an O-ring 35 is disposed on the outer periphery of the sliding sleeve 33 to seal the sliding sleeve 33 and the valve seat 31 .

[0057] It can be understood that there is an O-ring 35 on the sleeve 33 for sealing. When the control valve stem assembly 4 closes the output port, it prevents the fluid from flowing out of the gap between the sleeve 33 and the valve seat 31. In practical applications, other sealing structures 5 can also be used instead of the O-ring 35. There is no limitation to this as long as the above-mentioned technical effect can be achieved.

[0058] In one embodiment, the valve seat 31 is set as a spherical valve seat 31 or a conical valve seat 31, and the sealing structure 5 may not be provided, so as to achieve the effect of preventing the fluid from flowing out of the gap between the sliding sleeve 33 and the valve seat 31. As a preferred embodiment, the sealing structure 5 is provided between the sliding sleeve 33 and the valve seat 31.

[0059] Furthermore, the valve stem assembly 4 includes an upper valve stem 41 and a lower valve stem 42. The upper valve stem 41 is rotatably disposed on the valve body 1, and the lower valve stem 42 is nested in the end of the upper valve stem 41. The lower valve stem 42 is rotatably connected to the upper valve stem 41, and the lower valve stem 42 is located in the inner cavity of the valve body 1, and the lower valve stem 42 is arranged to move axially along the valve body 1.

[0060] It should be noted that by rotating the upper valve stem 41 in the forward direction, the lower valve stem 42 is driven to move upward to open the output port so that the fluid can flow out of the output port, and by rotating the upper valve stem 41 in the reverse direction, the lower valve stem 42 is driven to move downward to close the output port so that the fluid is cut off. Alternatively, by rotating the upper valve stem 41 in the forward direction, the lower valve stem 42 is driven to move downward to close the output port so that the fluid is cut off, and by rotating the upper valve stem 41 in the reverse direction, the lower valve stem 42 is driven to move upward to open the output port so that the fluid can flow out of the output port. There is no limitation on this, as long as the above technical effects can be achieved.

[0061] Among them, in this embodiment, the valve stem assembly 4 and the one-way check assembly 3 are coaxially arranged, but in actual application, the valve stem assembly 4 and the one-way check assembly 3 can be vertically arranged without limitation, as long as the above-mentioned technical effect can be achieved.

[0062] In the above embodiment, one end of the upper valve stem 41 away from the lower valve stem 42 is embedded in the handle 6 , and the upper valve stem 41 is fixed to the handle 6 by a set screw 7 .

[0063] It can be understood that the upper valve stem 41 is installed in the handle 6 and is tightened by the set screw 7. When in use, the handle 6 is rotated to drive the valve stem assembly 4 to move, so as to open and close the output port.

[0064] On the basis of the above embodiment, the inner cavity of the valve body 1 is provided with a step groove for installing the sealing structure 5, and the sealing structure 5 is a packing assembly, which includes a packing pad 51, a packing 52, a packing retaining ring 53 and a packing pressure pad 53 arranged along the axial direction of the lower valve stem 42 and circumferentially of the lower valve stem 42, the packing pressure pad 53 is arranged at the bottom of the step groove, the packing pad 51 is arranged at the end of the upper valve stem 41, the packing 52 is arranged between the packing pressure pad 53 and the packing pad 51, and packing retaining rings 53 are provided on both end surfaces of the packing 52.

[0065] It should be noted that the inner cavity of the valve body 1 is processed with a step groove for placing the packing pad 51, the packing retaining ring 53, the packing 52 and the packing pressure pad 53. The lower valve stem 42 is installed in the middle of the packing 52. The lower valve stem 42 moves up and down along the packing 52. The packing assembly is used to seal the lower valve stem 42 and the inner cavity of the valve body 1 to prevent the fluid from flowing out from the gap between the lower valve stem 42 and the inner cavity of the valve body 1.

[0066] In this embodiment, the sealing structure 5 is a packing assembly, but in practical applications, there is no limitation on the type of the sealing structure 5 as long as the above-mentioned technical effects can be achieved.

[0067] In the above embodiment, a packing gland 55 threadedly connected to the step groove is provided on the circumference of the upper valve stem 41 , and the packing gland 55 abuts against the packing pressure pad 53 .

[0068] It can be understood that the lower valve stem 42 is sleeved with the upper valve stem 41 , the upper valve stem 41 is screwed with the packing gland 55 , the packing gland 55 presses the packing pad 53 , and the rotation of the upper valve stem 41 drives the lower valve stem 42 to move axially along the valve body 1 .

[0069] Among them, in this embodiment, the positions and connection relationships of the upper valve stem 41, the lower valve stem 42, the packing gland 55 and the valve body 1 are set in this way, but in actual applications, there is no restriction on the connection relationship between the components as long as the above-mentioned technical effects can be achieved.

[0070] As a preferred embodiment, the outer periphery of the packing gland 55 is provided with an anti-loosening sheet 8 .

[0071] It should be noted that the anti-loosening sheet 8 is sleeved on the packing gland 55 to fix the position of the packing gland 55 .

[0072] In the above situation, the bottom end of the anti-loosening piece 8 is provided with a supporting ring 9 which abuts against the valve body 1 , and the supporting ring 9 and the anti-loosening piece 8 are fixed to the valve body 1 by locking screws 10 .

[0073] It can be understood that the anti-loosening plate 8 is supported by the support ring 9 and is tightened with the locking screw 10 to fix the packing cover 55. In the present embodiment, the packing cover 55 is locked and fixed by the anti-loosening plate 8, the support ring 9 and the locking screw 10. However, in actual application, there is no restriction on the fixing method of the packing cover 55 as long as the above-mentioned technical effect can be achieved.

[0074] In the above embodiment, the output port is provided with a second gland 11 and a screw sleeve 12 for installing the pipeline, and the first gland 32 is also provided with a second gland 11 and a screw sleeve 12.

[0075] It should be noted that the output port of the valve body 1 is equipped with a second gland 11 and a screw sleeve 12 for installing system pipelines, and the first gland 32 is also equipped with a second gland 11 and a screw sleeve 12 for installing system pipelines.

[0076] The second gland 11 and the screw sleeve 12 may also be replaced by other adapters as long as the connection of the pipeline can be achieved.

[0077] In summary, the one-way stop valve with filtering function provided by the utility model can allow fluid to enter the inner cavity of the valve body 1 through the input port at the lower part of the valve body 1. After the fluid enters, it is first filtered by the filter element 2 to ensure the cleanliness of the fluid, so as to achieve the filtering effect. When the inlet pressure of the fluid reaches the compression force of the spring 34, the sleeve 33 opens, and the fluid enters the inner cavity of the valve body 1 through the sleeve 33. Due to the action of the sleeve 33, the O-ring 35 and the spring 34, the fluid can only flow upward, so as to achieve the check function. When the lower valve stem 42 is opened, the fluid can flow to the output port and enter the pipeline system. If the inlet pressure needs to be cut off, the handle 6 is rotated, and the handle 6 moves the lower valve stem 42 downward through the transmission of the upper valve stem 41 until it is in the closed position, so as to achieve the purpose of cutting off. Thus, the function of integrating the filter, the one-way valve and the stop valve is realized. The one-way stop valve body 1 has a small volume, a compact structure, a low cost, is easy to operate and control, can reduce leakage points, and reduce the risk of leakage.

[0078] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0079] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] The above is a detailed introduction to a one-way stop valve with a filtering function provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A one-way stop valve with filtering function, characterized in that: include: A valve body (1), the valve body (1) being provided with an input port and an output port, the input port and the output port both being in communication with an inner cavity of the valve body (1); A filter element (2) is arranged in the inner cavity of the valve body (1), and the filter element (2) is arranged close to the input port; a one-way check component (3) disposed in the inner cavity of the valve body (1); the one-way check component (3) is disposed inside the inner cavity relative to the filter element (2) and close to the inner cavity; the one-way check component (3) is used to control the one-way flow of the inner cavity fluid of the valve body (1), so that the fluid flows into the inner cavity of the valve body (1) from the input port of the valve body (1) and flows out from the output port of the valve body (1); A valve stem assembly (4) is arranged in the inner cavity of the valve body (1); the valve stem assembly (4) is movably arranged in a direction close to and away from the output port, and is used to control the closing and opening of the output port; a sealing structure (5) is provided in the circumference of the valve stem assembly (4).

2. The one-way stop valve with filtering function according to claim 1, characterized in that: The one-way check assembly (3) comprises: A valve seat (31) is arranged at the input port through a first gland (32), the valve seat (31) has a long hole in the middle, and the filter element (2) is arranged in the long hole; A sliding sleeve (33), one end of the sliding sleeve (33) being embedded in the end of the long hole, the other end of the sliding sleeve (33) being provided with a mounting groove, and a water inlet hole communicating with the mounting groove being provided in the circumference of the sliding sleeve (33); A spring (34), one end of the spring (34) is arranged in the installation groove, and the other end of the spring (34) abuts against a spring seat in the inner cavity of the valve body (1).

3. The one-way stop valve with filtering function according to claim 2, characterized in that: An O-ring (35) is provided on the outer periphery of the sliding sleeve (33) to seal the sliding sleeve (33) and the valve seat (31).

4. The one-way stop valve with filtering function according to claim 3, characterized in that: The valve stem assembly (4) comprises: An upper valve stem (41) rotatably disposed on the valve body (1); The lower valve stem (42) is nested in the end of the upper valve stem (41), the lower valve stem (42) is rotatably connected to the upper valve stem (41), the lower valve stem (42) is located in the inner cavity of the valve body (1), and the lower valve stem (42) is arranged to move along the axial direction of the valve body (1).

5. The one-way stop valve with filtering function according to claim 4, characterized in that: One end of the upper valve stem (41) away from the lower valve stem (42) is nested in the handle (6), and the upper valve stem (41) is fixed to the handle (6) by a set screw (7).

6. The one-way stop valve with filtering function according to claim 5, characterized in that: The inner cavity of the valve body (1) is provided with a step groove for installing the sealing structure (5), and the sealing structure (5) is a packing assembly, and the packing assembly includes a packing pad (51) arranged along the axial direction of the lower valve stem (42) and the circumference of the lower valve stem (42), a packing (52), a packing retaining ring (53) and a packing pressure pad (54), wherein the packing pressure pad (54) is arranged at the bottom of the step groove, the packing pad (51) is arranged at the end of the upper valve stem (41), the packing (52) is arranged between the packing pressure pad (54) and the packing pad (51), and the packing retaining ring (53) is provided on both end surfaces of the packing (52).

7. The one-way stop valve with filtering function according to claim 6, characterized in that: A packing gland (55) threadedly connected to the step groove is provided on the circumference of the upper valve stem (41), and the packing gland (55) abuts against the packing pressure pad (54).

8. The one-way stop valve with filtering function according to claim 7, characterized in that: The outer periphery of the packing gland (55) is provided with an anti-loosening sheet (8).

9. The one-way stop valve with filtering function according to claim 8, characterized in that: The bottom end of the anti-loosening plate (8) is provided with a support ring (9) that abuts against the valve body (1), and the support ring (9) and the anti-loosening plate (8) are fixed to the valve body (1) by means of locking screws (10).

10. The one-way stop valve with filtering function according to any one of claims 2 to 9, characterized in that: The output port is provided with a second gland (11) and a screw sleeve (12) for installing a pipeline, and the first gland (32) is also provided with the second gland (11) and the screw sleeve (12).

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