Filtering apparatus provided with bidirectional check valve

Abstract

The present invention relates to a filtering apparatus provided with a bidirectional check valve, allowing foreign substances to be filtered and discharged even if fluid flows in from one side as well as the other side. The present invention comprises: a housing having a hollow inside, an upper portion blocked by a cover portion, a lower portion through which an inlet is formed, and a side wall through which a first discharge port is formed; a filter portion which is inserted into and coupled to the inside of the housing so as to be spaced apart from the inner wall surface of the housing and filters foreign substances from a fluid flowing in through the inlet; a flow space portion formed between the inner wall surface of the housing and the outside of the filter portion; an inflow check valve which is coupled to the inlet of the housing and, even when fluid flows in through any one of both side inflow tubes, allows the fluid only to flow into the housing through the inlet without sending the fluid to the other side inflow tube in the opposite direction; and a discharge tube which is coupled to one side of the housing and discharges filtered water that is filtered by the filter portion.

Description

A filter equipped with a two-way check valve

[0001] The present invention relates to a filtering device for removing foreign substances contained in a fluid by applying it to the middle section of various pipes through which a fluid such as water or oil is transported, and more specifically, to a filtering device equipped with a two-way check valve that allows foreign substances to be filtered and discharged regardless of whether the fluid flows in from one side or the other.

[0002] In general, most water pipes that supply water to each household are made of cast iron. As they age, rust and impurities fall off, causing foreign substances to be included in the water. Also, when replacing or repairing water pipes, impurities can contaminate the water and be supplied.

[0003] Therefore, if water containing these foreign substances is supplied to homes and offices without a separate filtration process, reddish water containing rust or other foreign substances that are unfit for drinking will flow from the faucet. Furthermore, not only is it undrinkable, but it can also cause water meters installed in the middle of the water pipe to malfunction or cause boilers to clog. To prevent this, strainers are installed in the middle of the pipe to remove foreign substances from the water.

[0004] Additionally, a filtering device is required to remove foreign substances from oil used in machinery, ships, etc., and oil stored in oil storage tanks, etc., to prevent them from being contaminated.

[0005] However, most conventional filtering devices are designed to remove foreign substances from fluid flowing in one direction and then discharge them in the other direction. If fluid also flows in from the other direction, filtration is not performed properly.

[0006] Additionally, in order to ensure that filtration is performed by a single filter device even when fluid flows in from one or the other direction, a solenoid valve may be provided to control the direction of the valve. This is to prevent the fluid flowing in from one or the other direction from flowing in the opposite direction and to ensure that the fluid flows only into the filter device.

[0007] However, solenoid valves cannot operate in places where electricity is not supplied, and there is a risk of explosion or fire due to electrical sparks generated from the solenoid valve in filtering equipment that handles oil, making them difficult to use.

[0008] Additionally, the filter must be periodically cleaned of foreign substances. This requires closing each valve in the pipe and cleaning the filter. This requires significant cleaning time and inconveniences users due to water shortages.

[0009] Korean Patent Publication No. 10-2022-0074269, 'Bidirectional strainer with rotatable mesh screen', enables filtration in response to water flow in both directions with a single strainer.

[0010] That is, when water flows in one direction, filtration is carried out by the foreign substance capturing surface of the mesh screen, and when the water flow changes, the valve is locked and the foreign substance capturing surface of the mesh screen is rotated in the opposite direction, making it possible to capture foreign substances even in the opposite direction of water flow.

[0011] However, this also had the problem that the inconvenience was not resolved because in order to change the direction of the mesh screen, the valve of the pipe still had to be locked and the mesh screen had to be rotated, and in order to clean the mesh screen, the lid had to be opened and the mesh screen had to be cleaned.

[0012] The present invention has a problem to be solved by enabling the filtering of foreign substances contained in a fluid by a single filtering device even when the fluid is introduced through a pipe on one side as well as the other side.

[0013] In addition, the present invention has another problem in that it prevents the fluid flowing in through the pipe on one side as well as the other side from flowing into the pipe in the opposite direction and only flows into the inside of the check valve.

[0014] In addition, the present invention has another challenge in that it can be easily operated even in places where power cannot be supplied.

[0015] In addition, the present invention has another problem in that it is possible to wash foreign substances caught by a filter net without separating the filter net of the filter device.

[0016] The present invention is characterized in that it comprises a housing having a hollow interior, an upper portion blocked by a cover portion, an inlet formed through a lower portion, and a first outlet formed through a side wall; a filtering portion inserted and coupled into the housing so as to be spaced apart from the inner wall surface of the housing and filtering foreign substances from fluid introduced through the inlet portion; a flow space portion formed between the inner wall surface of the housing and the outer side of the filtering portion; an inlet check valve coupled to the inlet port of the housing and allowing fluid introduced through the inlet port only into the interior of the housing without sending it to the opposite inlet pipe when it is introduced through the inlet pipe on either side; and a discharge pipe coupled to one side of the housing and discharging filtered water filtered by the filtering portion.

[0017] According to one embodiment of the present invention, the inlet check valve is characterized in that the flow path of the inlet check valve can be changed by the pressure of the fluid flowing in through the inlet pipes on both sides even when no electricity is supplied.

[0018] According to another embodiment of the present invention, it is characterized by including a housing having a hollow interior, an upper portion blocked by a cover portion, an inlet formed through a lower portion, and a first outlet and a second outlet formed through a side wall, respectively; a filtering portion inserted and coupled into the housing so as to be spaced apart from an inner wall surface of the housing and filtering foreign substances from a fluid introduced through the inlet portion; a flow space portion formed between the inner wall surface of the housing and the outer side of the filtering portion; an inlet check valve coupled to the inlet of the housing and allowing a fluid introduced through an inlet pipe of either one of the two inlet pipes to be introduced only into the interior of the housing through the inlet portion without being sent to an inlet pipe of the opposite side; and an exhaust check valve allowing a fluid filtered by the filtering portion to be discharged only through either the first outlet or the second outlet.

[0019] According to one embodiment of the present invention, the inlet check valve is characterized in that it has an inlet pipe body formed to be connected in a T shape, each end having a through hole formed therethrough, and includes an opening / closing ball inserted into the inside of the inlet pipe body and moved toward the through holes on both sides facing each other by the pressure of the fluid.

[0020] According to one embodiment of the present invention, the discharge check valve is characterized in that it has a discharge pipe body formed to be connected in a T shape, one of the sides facing each other is blocked, and a through hole is formed through the other side and the end of the middle portion, an elastic support is supported and connected to one side inside the discharge pipe body, and an opening / closing ball is inserted and provided inside the discharge pipe body.

[0021] According to one embodiment of the present invention, the opening / closing ball is characterized in that it is made of a soft synthetic resin material and is filled with liquid inside.

[0022] According to one embodiment of the present invention, the discharge check valve includes a first discharge check valve coupled to a first discharge port and a second discharge check valve coupled to a second discharge port, and is characterized in that it operates such that filtered water is discharged when only one of the first discharge check valve and the second discharge check valve is opened.

[0023]

[0024] *According to one embodiment of the present invention, a first discharge pipe is connected so as to be in communication between the first discharge check valve and one side inlet pipe connected to the inlet check valve, and a second discharge pipe is connected so as to be in communication between the second discharge check valve and the other side inlet pipe connected to the inlet check valve, so that the first discharge check valve and the second discharge check valve are operated by the pressure of the fluid flowing in through one side or the other side inlet pipe.

[0025] According to one embodiment of the present invention, the inlet check valve and the discharge check valve are characterized in that the flow path can be changed by the pressure of the fluid flowing in through the inlet pipes on both sides even without electricity being supplied.

[0026] According to one embodiment of the present invention, the filtering unit is further characterized by having a foreign substance removal unit for removing foreign substances attached to the inner wall surface of the filtering unit.

[0027] According to one embodiment of the present invention, the foreign matter removal unit is characterized by including a rotating body that is rotatably inserted and coupled to the inside of the filtering unit, and a brush unit that is coupled to an end of the rotating body so as to be in contact with the inner wall surface of the filtering unit.

[0028] According to one embodiment of the present invention, the filter unit is further characterized in that a foreign matter discharge port is provided on the lower side thereof so as to penetrate the housing.

[0029] The present invention has the effect of filtering foreign substances contained in a fluid even when the direction of water flowing in a pipe is one direction or the opposite direction due to a single check valve.

[0030] In addition, the present invention does not require separate power and operates by the flow pressure of the fluid, so it can be applied to various fields, and there is no concern about explosion or fire due to electric sparks.

[0031] In addition, the present invention has an advantage in that foreign substances caught by the filter net can be washed away without separating the filter net of the check valve.

[0032] Figure 1 is an example of an exploded view of a conventional two-way check valve.

[0033] Figure 2 is a general conceptual diagram of a filtering device according to one embodiment of the present invention.

[0034] Figure 3 is a front view of a filter device according to one embodiment of the present invention.

[0035] Figure 4 is a partially cutaway view showing the lower portion of a filter device according to one embodiment of the present invention.

[0036] Figure 5 is an exploded conceptual diagram of a filter device according to one embodiment of the present invention.

[0037] Figure 6 is a side cross-sectional view of a filter device according to one embodiment of the present invention.

[0038] Figure 7 is a side cross-sectional view of an inlet check valve of a filter device according to one embodiment of the present invention.

[0039] Figure 8 is a side cross-sectional view of a discharge check valve of a filter device according to one embodiment of the present invention.

[0040] Figure 9 is an exemplary diagram illustrating a guide tube of a filter device according to one embodiment of the present invention in isolation.

[0041] Figure 10 is a side cross-sectional view showing a state in which a guide tube and an opening / closing ball are inserted into an inlet check valve of a filter device according to one embodiment of the present invention.

[0042] Figure 11 is a side cross-sectional view illustrating a state in which an opening / closing ball blocks one through hole in a discharge check valve of a filter device according to one embodiment of the present invention.

[0043] Figure 12 is a side cross-sectional view illustrating a state in which an opening / closing ball in a discharge check valve of a filter device according to one embodiment of the present invention opens one through-hole.

[0044] Figures 13 and 14 are side cross-sectional views schematically illustrating a state in which fluid is introduced through one or the other side pipe into a filtering device according to one embodiment of the present invention, filtered, and then discharged through the opposite side pipe.

[0045] The filtering device (100) of the present invention may include a housing (110), a filtering unit (120), a flow space unit (130), an inlet check valve (140), a discharge pipe (150) or a discharge check valve (160), and a foreign substance removal unit (170).

[0046] Here, the housing (110) has a vertical tube shape with a hollow interior of a predetermined diameter, and the upper part is open and blocked by a cover part (111). An inlet (112) is formed through a hole in the lower part to communicate with the interior, and a first outlet (113) is formed through a hole in one side. In another embodiment, a second outlet (114) may be formed through a hole spaced apart from the first outlet (113). In addition, the housing (110) may be installed at a predetermined height from the floor by a leg part (115) provided at the lower part, and it is preferable that the leg part (115) be configured to be adjustable in height up and down.

[0047] The filter (120) is inserted and connected through the upper part of the housing (110). It filters out foreign substances from the fluid flowing into the filter (120) through the inlet (112) of the housing (110), and then passes the filtered water to the outside.

[0048] The filter (120) is formed in the form of a fine mesh and is intended to filter foreign substances contained in various fluids such as water, oil, engine oil, cooking oil, and others. Accordingly, any one of various meshes can be selected and applied depending on the characteristics of the various fluids and the intended use of the fluids.

[0049] For this purpose, it is preferable that the filtering unit (120) has a diameter smaller than that of the housing (110), and therefore, a flow space (130) is formed with a predetermined width between the outer side of the filtering unit (120) inserted and coupled into the interior of the housing (110) and the inner wall surface of the housing (110) so that the filtered water filtered through the filtering unit (120) can move.

[0050] In addition, a foreign substance discharge port (121) may be further installed on the lower side of the filter unit (120) to communicate with the outside by penetrating the housing (110). This is a configuration for discharging foreign substances filtered by the filter unit (120) to the outside.

[0051] The inlet check valve (140) is coupled with the inlet port (112) of the housing (110) and supplies the fluid flowing in through the inlet pipe (P1) (P2) into the interior of the housing (110).

[0052] The inlet check valve (140) for this purpose has an overall T-shape and is provided with an inlet pipe body (141) formed to be in communication, and an opening / closing ball (142) is inserted and connected inside the inlet pipe body (141). The inlet pipe body (141) has a through hole (143) formed at each of the three ends to communicate with the outside. It is preferable that a blocking projection (144) be provided on the inside at the ends of the through holes (143) facing each other to block the opening / closing ball (142).

[0053] A discharge pipe (150) is connected to the first discharge port (113) of the housing (110) so that the filtered water filtered by the filter (120) and then introduced into the flow space (130) is discharged to the outside.

[0054] In addition, a separate discharge check valve (160) is further coupled to the first discharge port (113) and the second discharge port (114) of the housing (110), respectively, to control the discharge of the filtered water inside the housing (110).

[0055] The discharge check valve (160) for this purpose is formed in a T shape overall, and is provided with a discharge pipe body (161) formed to be in communication, and an opening / closing ball (162) is inserted and coupled inside the discharge pipe body (161). One of the opposing sides of the discharge pipe body (161) is blocked by a blocking member (163), and a through hole (164) is formed through the other side and the end of the discharge pipe body (161). It is preferable that a blocking projection (165) for blocking the opening / closing ball (162) be provided on the inside of the other through hole (164).

[0056] In addition, an elastic support (166) of a predetermined length can be combined with the blocking member (163) of the discharge pipe body (161) to support the opening / closing ball (162) inserted inside the discharge pipe body (161).

[0057] In the present invention, a straight guide tube (145) (167) is further provided to facilitate movement of the opening / closing ball (142) (162) inside the inlet pipe body (141) and the discharge pipe body (161) so that a close fitting can be achieved, and it is preferable that a communication hole (146) (168) is formed penetrating in the middle portion in the side direction of the middle portion of the inlet pipe body (141) and the discharge pipe body (161).

[0058] Among the discharge check valves (160) of the present invention, the discharge check valve (160) coupled to the first discharge port (113) can be described as a first discharge check valve (1610), and the discharge check valve (160) coupled to the second discharge port (114) can be described as a second discharge check valve (1620).

[0059] A first discharge check valve (1610) is connected to a first discharge pipe (151), and the other side of the first discharge pipe (151) can be connected to a one-side inlet pipe (P1) connected to an inlet check valve (140). In addition, a second discharge pipe (152) is connected to a second discharge check valve (1620), and the other side of the second discharge pipe (152) can be connected to a other-side inlet pipe (P2) connected to an inlet check valve (140).

[0060] Accordingly, the fluid flowing into the one-side inlet pipe (P1) can flow toward the first discharge pipe (151) connected to the inlet check valve (140), and similarly, the fluid flowing into the other-side inlet pipe (P2) can flow toward the second discharge pipe (152) connected to the inlet check valve (140).

[0061] However, the fluid flowing into the first discharge pipe (151) and the second discharge pipe (152) is blocked from flowing into the housing (110) by the operation of the first and second discharge check valves (1610) (1620).

[0062] Meanwhile, the opening / closing ball (142)(162) of the present invention is preferably made of a synthetic resin material that is soft and does not tear easily, and is formed in a circular shape so that a liquid is filled inside to a predetermined space.

[0063] The foreign matter removal unit (170) is inserted and coupled into the inside of the filter unit (120) to detach and remove foreign matters attached to the inner wall surface of the filter unit (120), and may include a rotating body (171), a brush unit (172), and a driving unit (173) for rotating the rotating body (171).

[0064] The rotating body (171) is arranged parallel to the inside of the filtering unit (120), and a driving unit (173) for rotating the rotating body (171) is provided on the outside of the upper cover unit (113). The driving unit (173) may be applied in various ways to rotate the rotating body (171), and may be configured to be driven manually or driven by a motor, etc.

[0065] A support (174) is provided in at least two directions toward the inner wall surface of the filter (120) in the rotating body (171), and a brush part (172) can be coupled to the end of the support (174) so ​​as to be in contact with the inner wall surface of the filter (120).

[0066] Hereinafter, the operation relationship of the filter device (100) equipped with a two-way check valve of the present invention configured as described above will be described.

[0067] The filtering device (100) of the present invention is coupled to the middle part of the inlet pipe (P) to remove foreign substances contained in the fluid. For this purpose, the filtering device (100) couples the filtering part (120) and the foreign substance removal part (170) inside the housing (110), and couples the inlet check valve (140) so as to be connected to the inlet port (112). In addition, the inlet pipes (P1) (P2) are connected to both sides of the inlet check valve (140) using expansion pipes or the like.

[0068] In addition, one side of the first and second discharge check valves (1610) (1620) is connected to the first and second discharge ports (113) (114) of the housing (110), and one end of the first and second discharge pipes (151) (152) is connected to the other side of the first and second discharge check valves (1610) (1620), and the other ends of the first and second discharge pipes (151) (152) are connected to the inlet pipes (P1) (P2), respectively.

[0069] Therefore, when fluid is introduced through one side of the inlet pipe (P1) or the other side of the inlet pipe (P1), some of the fluid is introduced toward the inlet check valve (140) and some of the fluid is introduced toward the first discharge pipe (151) or the second discharge pipe (152).

[0070] At this time, the fluid flowing into the inlet check valve (140) flows into the inlet pipe body (141) through the through-hole (143) on one side, and the opening / closing ball (142) is pushed toward the through-hole (143) on the other side by the inlet pressure of the fluid, and is caught on the blocking projection (144), and the elastic opening / closing ball (142) blocks the through-hole (143). Therefore, the fluid flowing into the inlet check valve (140) does not flow in the opposite direction to the inlet side, but flows into the housing (110) through the through-hole (143) open in the middle of the inlet pipe body (141).

[0071] Meanwhile, since the opening / closing ball (142) moves within the guide tube (145) provided inside the inlet pipe body (141) when moving, there is no concern that the opening / closing ball (142) will rise toward the through hole (143) formed in the middle of the inlet pipe body (141), and it can easily move in a straight line toward the through hole (143) on the other side facing each other.

[0072] Accordingly, the fluid flows into the filter (120) through the central through-hole (143) of the inlet pipe body (141) via the communication hole (146) formed in the guide pipe (145) of the inlet check valve (140) and then through the inlet port (112) of the housing (110).

[0073] Additionally, the fluid flowing into the first discharge pipe (151) or the second discharge pipe (152) is blocked from flowing into the interior of the housing (110).

[0074] That is, when fluid flows into the discharge check valve (160) through the first discharge pipe (151) or the second discharge pipe (152), the opening / closing ball (162) supported by the elastic support (167) is pushed toward the end of the through-hole (164) on the first discharge port (113) or the second discharge port (114) side of the housing (110) and is caught by the blocking projection (165). Therefore, the opening / closing ball (162) having elasticity reliably blocks the through-hole (164), preventing fluid from flowing into the housing (110). Of course, the discharge check valve (160) on the side where fluid does not flow can be opened because the opening / closing ball (165) does not block the through-hole (164).

[0075] At this time, since the opening / closing ball (162) moves within the guide tube (167) provided inside the discharge pipe body (161), there is no concern that the opening / closing ball (162) will move toward the through hole (163) formed in the middle of the discharge pipe body (161), and it is possible to easily move in a straight direction.

[0076] The fluid introduced into the filtering unit (120) through the inlet (112) of the housing (110) has foreign substances filtered out by the filtering unit (120) and then passes to the outside of the filtering unit (120) and is stored in the flow space (130). Then, the fluid is pressurized toward the first and second outlets (113) (114) by the pressure of the fluid inside the housing (110).

[0077] At this time, when the fluid flows into the one-side inlet pipe (P1), the inside of the first discharge check valve (1610) is blocked by the opening / closing ball (162), so it cannot be discharged to the first discharge check valve (1610). However, the opening / closing ball (162) moves without resistance due to the pressure of the fluid being pressed toward the second discharge check valve (1620). Then, as the moving opening / closing ball (162) is supported by the elastic support (166), the through-hole (164) of the middle portion is opened. Therefore, the fluid flowing into the one-side inlet pipe (P1) is filtered by the filter (120) inside the housing (110), discharged to the second discharge check valve (1620), passed through the second discharge pipe (152), and then discharged to the other-side inlet pipe (P2).

[0078] On the contrary, when the fluid flows into the other side inlet pipe (P2), the inside of the second discharge check valve (1620) is blocked by the opening / closing ball (162), so it cannot be discharged to the second discharge check valve (1620). However, the opening / closing ball (162) moves without resistance due to the pressure of the fluid being pressed toward the first discharge check valve (1610). Then, as the moving opening / closing ball (162) is supported by the elastic support (166), the through-hole (164) of the middle portion is opened. Therefore, the fluid flowing into the other side inlet pipe (P2) is filtered by the filter (120) inside the housing (110), discharged to the first discharge check valve (1610), passed through the first discharge pipe (151), and then discharged to the one side inlet pipe (P1).

[0079] Therefore, in the filtering device (100) of the present invention, regardless of which inlet pipe (P1) (P2) on either side is used, the fluid is filtered by the filtering unit (120) and then discharged through the inlet pipe on the other side.

[0080] In addition, the filter device (100) of the present invention can easily clean foreign substances filtered inside the filter device (120) without separating the filter device (100) from the filter device (120).

[0081] That is, when the driving unit (173) of the foreign substance removal unit (170) is driven by a motor or manually, the rotating body (171) rotates and the brush unit (172) coupled to the end of the support (174) rotates while coming into contact with the inner wall surface of the filter unit (120). Accordingly, as the brush unit (172) rotates, the foreign substances attached to the inner wall surface of the filter unit (120) are washed away and the filter unit (120) recovers its filtering performance.

[0082] Foreign substances dropped by the foreign substance removal unit (170) fall to the bottom of the filter unit (120) and are then discharged to the outside of the housing (110) through the foreign substance discharge port (121) opened by a separate valve.

Claims

1. A housing having a hollow interior, an upper portion blocked by a cover, an inlet formed through a lower portion, and a first outlet formed through a side wall; A filtering unit inserted and joined inside the housing so as to be spaced apart from the inner wall surface of the housing and to filter foreign substances from the fluid flowing in through the inlet; A fluid space formed between the inner wall surface of the housing and the outer surface of the filter section; An inlet check valve that is connected to the inlet of the housing and allows fluid to flow only into the interior of the housing through the inlet, without sending it to the other inlet pipe in the opposite direction, even if the fluid flows in through the inlet pipe on either side of the two inlet pipes; and A filtering device having a two-way check valve, characterized in that it includes a discharge pipe coupled to one side of the housing and discharging filtered water filtered by the filter unit.

2. In paragraph 1, The above inlet check valve operates even when electricity is not supplied. A filter device equipped with a two-way check valve, characterized in that the flow path of the inlet check valve can be changed by the pressure of the fluid flowing in through the inlet pipes on both sides.

3. A housing having a hollow interior, the upper part being blocked by a cover, an inlet formed through a hole in the lower part, and a first outlet and a second outlet formed through a hole in the side wall; A filtering unit inserted and joined inside the housing so as to be spaced apart from the inner wall surface of the housing and to filter foreign substances from the fluid flowing in through the inlet; A fluid space formed between the inner wall surface of the housing and the outer surface of the filter section; An inlet check valve that is connected to the inlet of the housing and allows fluid to flow only into the interior of the housing through the inlet, without sending it to the other inlet pipe in the opposite direction, even if the fluid flows in through the inlet pipe on either side of the two inlet pipes; and A filter device equipped with a two-way check valve, characterized in that it includes a discharge check valve that allows the fluid filtered by the filter unit to be discharged only through one of the first discharge port and the second discharge port.

4. In paragraph 1 or paragraph 3, The above inlet check valve is, It is provided with an inlet pipe body formed to be connected in a T shape, and a through hole is formed at each end. A filtering device equipped with a two-way check valve, characterized in that it includes an opening / closing ball that is inserted into the inside of the inlet pipe body and moves toward the through holes on both sides facing each other by the pressure of the fluid.

5. In paragraph 4, The above opening / closing ball is, A filter device having a two-way check valve characterized by being made of a soft synthetic resin material and having a liquid filled inside.

6. In paragraph 3, The above discharge check valve is, A discharge pipe body formed to be connected in a T shape is provided, and one of the sides facing each other is blocked. At the ends of the other side and the middle section, a through hole is formed through each side. An elastic support is supported and connected to one side of the inner surface of the above discharge pipe body, A filter device equipped with a two-way check valve, characterized in that an opening / closing ball is inserted into the inside of the discharge pipe body.

7. In paragraph 6, The above opening / closing ball is, A filter device having a two-way check valve characterized by being made of a soft synthetic resin material and having a liquid filled inside.

8. In paragraph 3, The above discharge check valve is, A first discharge check valve coupled to the first discharge port, and Includes a second discharge check valve coupled to the second discharge port, A filter device equipped with a two-way check valve, characterized in that only one of the first discharge check valve and the second discharge check valve is opened to discharge filtered water.

9. In paragraph 8, Between the first discharge check valve and the one-side inlet pipe connected to the inlet check valve, the first discharge pipe is connected so as to be in communication with each other. Between the second discharge check valve and the other side inlet pipe connected to the inlet check valve, a second discharge pipe is connected so as to be in communication with each other. A filter device equipped with a two-way check valve, characterized in that the first discharge check valve and the second discharge check valve are operated by the pressure of the fluid flowing in through one or the other inlet pipe.

10. In paragraph 3, The above inlet check valve and discharge check valve are, A filter device equipped with a two-way check valve characterized in that the flow path can be changed by the pressure of the fluid flowing in through the inlet pipes on both sides even when no electricity is supplied.

11. In paragraph 1 or paragraph 3, Inside the above filter section, A filter device equipped with a two-way check valve, characterized in that it further comprises a foreign substance removal section for removing foreign substances attached to the inner wall surface of the filter section.

12. In paragraph 11, The above foreign substance removal unit is, A rotating body that is rotatably inserted and connected to the inside of the above filter section, A filtering device equipped with a two-way check valve, characterized in that it includes a brush part coupled to the end of a rotating body so as to come into contact with the inner wall surface of the filter part.

13. In paragraph 11, A filter device equipped with a two-way check valve, characterized in that a foreign matter discharge port is further provided on the lower side of the filter section so as to penetrate the housing.

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