Two-way valve structure with external manual opening and closing

Abstract

The present invention relates to a bidirectional valve structure capable of external manual opening and closing. The bidirectional valve structure capable of external manual opening and closing comprises: a housing having a fluid path formed in the longitudinal direction; a poppet provided on the fluid path of the housing and sliding along the direction of the fluid path to open and close the fluid path; a hex coupled to the housing with a portion of the poppet inserted internally from one side; a case with a penetrating interior that is inserted so as to protrude from the other side of the hex; a stopper provided on the opposite side of the case; a plunger including an elastic body provided inside the case that elastically supports the poppet partially inserted internally; and an opening / closing part that passes through the stopper and elastically supports the poppet by the elastic body on the opposite side of the poppet, and slides the poppet by user operation. This allows an operator to quickly perform an emergency release even in situations where the electrical operation of the solenoid valve becomes impossible due to coil disconnection, power cutoff, or poppet sticking caused by foreign matter, causing the hydraulic pump to continue operating and the pressure in the line to rise, thereby preventing hose rupture, seal damage, and manifold Secondary safety accidents caused by damage to the block or unintended movement of the working machine are prevented, thereby improving safety. The same sealing reliability is ensured whether the fluid flow is from one side to the other or in the opposite direction. Compared to a unidirectional dedicated valve, the burden of managing parts types and inventory is reduced. Compatibility is improved, allowing for application to various hydraulic circuit configurations within the same manifold block. Additionally, a lubrication chamber is formed in the operating pin, which independently maintains two-stage sealing action and prevents external leakage, thereby improving durability.

Description

Technology Field

[0001] The following embodiments relate to a bidirectional valve structure capable of external manual opening and closing. Background Technology

[0003] A solenoid valve is one of the driving devices used in various industrial fields, and it is a device that opens and closes an internal flow path using the induced electromotive force generated after applying current to the coil of the solenoid valve.

[0004] These solenoid valves are highly useful for controlling fluid flow direction or pressure in hydraulic systems such as construction heavy equipment, agricultural machinery, and special-purpose vehicles; in particular, cartridge-type solenoid valves mounted on manifold blocks where multiple hydraulic lines are concentrated are widely adopted.

[0005] These solenoid valves are generally classified into a Normal Close type, which normally blocks the flow path and opens by electromagnetic force, and a Normal Open type, which normally keeps the flow path open and blocks it by electromagnetic force.

[0006] In particular, a normally closed type valve performs the role of maintaining the position of a hydraulic cylinder or blocking a specific line while the hydraulic pump is continuously operating. To stably implement this, the direction of hydraulic action, the direction of electromagnetic force action, and the mechanical sealing structure can operate organically.

[0007] Conventional valve structures are designed to be driven solely by electrical signals, which leads to a problem where the valve becomes stuck in a closed state during emergencies such as coil failure or power interruption. In such cases, it is impossible to relieve excessive pressure within the system or manually return the cylinder, potentially causing damage to hydraulic lines or equipment safety accidents. Prior art literature

[0009] 1. Korean Patent Application No. 10-2010-0129126 (December 16, 2010) 2. Korean Patent Application No. 10-2009-0115939 (November 27, 2009) The problem to be solved

[0010] The present invention provides a bidirectional valve structure capable of external manual opening and closing, which allows an operator to immediately force open the flow path from the outside in the event of an emergency caused by malfunction due to an electrical signal problem. means of solving the problem

[0012] The present invention relates to a bidirectional valve structure capable of external manual opening and closing, wherein the bidirectional valve structure capable of external manual opening and closing comprises a housing having a flow path formed in the longitudinal direction, a poppet provided on the flow path of the housing and sliding along the direction of the flow path to open and close the flow path, a hex which is coupled to the housing and into which a part of the poppet is inserted from one side, a case which is inserted so that a part of it protrudes from the other side of the hex, a stopper provided on the opposite side of the case, a plunger including an elastic body provided inside the case and elastically supporting the poppet that is partially inserted into the case, and an opening / closing part that passes through the stopper and elastically supports the poppet by the elastic body on the opposite side of the poppet, and slides the poppet by user operation.

[0013] Additionally, the housing may include an outlet passage that penetrates radially from the flow path and discharges fluid flowing along the flow path to the outside, and the poppet may include a valve seat comprising a first orifice that penetrates the interior parallel to the outlet passage and a second orifice formed perpendicularly from the first orifice and arranged parallel to the outlet passage, a valve housing having a tip inserted into the interior of the valve seat that contacts the first orifice to close it, but opens the first orifice when the opening / closing part is operated, and an elastic member that elastically supports the valve housing between the valve seat and the valve housing.

[0014] Additionally, the opening / closing portion may include a knob coupled to the rear end of an operating pin, the front end of which passes through the stopper and contacts the elastic body, and the rear end of which is opposite and protrudes to the outside of the stopper; wherein the operating pin may include a fastening portion having screw threads formed between the front end and the rear end, and a sealing member formed protruding along the longitudinal direction between the front end and the fastening portion, having a diameter larger than the outer diameter of the operating pin.

[0015] Additionally, the sealing member includes a first sealing projection and a second sealing projection sequentially provided from the front end side toward the rear end side, and the operating pin may be formed such that the outer diameter between the first sealing projection and the second sealing projection is smaller than the outer diameter of the operating pin.

[0016] Additionally, the operating pin may include a locking projection formed larger than the outer diameter of the sealing member between the tip side and the first sealing projection, and the plunger may include a receiving portion formed inside and a locking projection in which the tip side of the operating pin is provided in the receiving portion and the locking projection engages to prevent detachment when the operating pin rises. Effects of the invention

[0018] According to the bidirectional valve structure capable of external manual opening and closing of the present invention, the following effects are achieved.

[0019] First, according to the bidirectional valve structure capable of external manual opening and closing according to the present invention, even in situations where the electrical operation of the solenoid valve becomes impossible due to a broken coil, power cutoff, or the poppet becoming stuck due to foreign matter, and the hydraulic pump continues to operate and the pressure in the line rises, the operator can quickly perform an emergency release, thereby preventing secondary safety accidents caused by hose rupture, seal breakage, manifold block damage, or unintended movement of the working machine, and thus improving safety.

[0020] Secondly, according to the bidirectional valve structure capable of external manual opening and closing according to the present invention, the same shielding reliability is ensured whether the fluid flow is from one side to the other or in the opposite direction, and compared to a unidirectional valve, the burden of managing parts types and inventory is reduced, and compatibility is improved so that it can be applied to various hydraulic circuit configurations within the same manifold block.

[0021] Thirdly, according to the bidirectional valve structure capable of external manual opening and closing according to the present invention, a lubrication chamber is formed in the operating pin, so that two stages of sealing are independently maintained and external leakage is blocked, thereby improving durability. Brief explanation of the drawing

[0023] FIG. 1 is a drawing illustrating a bidirectional valve structure capable of external manual opening and closing according to one embodiment. Figure 2 is a drawing showing the valve of Figure 1 separated. Figure 3 is a drawing showing a vertical cross-section of Figure 1. Figure 4 is a diagram showing the operation of Figure 3. Figure 5 is a diagram showing the operation of the opening and closing part in Figure 3. Specific details for implementing the invention

[0024] Hereinafter, embodiments are described in detail with reference to the attached drawings. However, various modifications may be made to the embodiments, and thus the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights.

[0025] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed forms, and the scope of this specification includes modifications, equivalents, or substitutions that fall within the technical concept.

[0026] Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component.

[0027] When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between.

[0028] The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0029] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0030] In addition, when describing with reference to the attached drawings, identical components are assigned the same reference numeral regardless of drawing symbols, and redundant descriptions thereof are omitted. In describing the embodiments, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the embodiments, such detailed description is omitted.

[0031] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0032] In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0033] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may unnecessarily obscure the essence of the present invention, such detailed description is omitted. Where terms such as "includes," "has," or "is made up" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically stated otherwise.

[0034] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0035] In the case of describing a positional relationship, for example, when the positional relationship between two parts is described using expressions such as 'on,' 'upper,' 'lower,' or 'next to,' one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used.

[0036] When elements or layers are referred to as "on" another element or layer, this includes cases where another layer or element is placed directly on top of or in between. Throughout the specification, the same reference numerals refer to the same components.

[0037] The size and thickness of each component shown in the drawings are illustrated for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

[0038] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and as will be fully understood by those skilled in the art, various technical interlocking and operation are possible, and each embodiment may be implemented independently of one another or together in an interlocking relationship.

[0039] Hereinafter, an embodiment of a bidirectional valve structure capable of external manual opening and closing according to the present invention will be described with reference to the attached drawings.

[0040] FIG. 1 is a drawing for explaining a bidirectional valve structure capable of external manual opening and closing according to one embodiment, FIG. 2 is a drawing showing the valve of FIG. 1 separated, FIG. 3 is a drawing showing a vertical cross-section of FIG. 1, FIG. 4 is a drawing showing the operation of FIG. 3, and FIG. 5 is a drawing showing the operation of the opening and closing part in FIG. 3.

[0041] Referring to FIGS. 1 to 5, an embodiment of the bidirectional valve structure capable of external manual opening and closing according to the present invention is described. The bidirectional valve structure capable of external manual opening and closing includes a housing (10), a poppet (20), a hex (30), a plunger (40), a case (50), a stopper (60), an opening / closing part (70), and a magnetic field induction unit (C).

[0042] The housing (10) includes a longitudinally formed fluid passage (11) and an outlet passage (12) that penetrates radially from the fluid passage (11) and discharges fluid flowing along the fluid passage (11) to the outside.

[0043] The poppet (20) includes a valve seat (21), a valve housing (22), an elastic member (23), a spring pin (24), and a ball (25), and is provided on the flow path of the housing (10) so as to slide along the direction of the flow path (11) to open and close the flow path (11). In this poppet (20), the plunger (40) slides by electromagnetic force through a magnetic field induction unit (C) that generates electromagnetic force, and the displacement of the plunger (40) is transmitted to the poppet (20) via an elastic body (42), thereby causing the poppet (20) to slide and open the flow path (11) of the housing (10) so that fluid can flow into the outlet flow path (12).

[0044] The valve seat (21) includes a first orifice (211) that is internally penetrated parallel to the outlet passage (12) and a second orifice (212) that is formed perpendicularly from the first orifice (211) and arranged parallel to the outlet passage (12).

[0045] The valve housing (22) has a front end inserted into the interior of the valve seat (21) that contacts the first orifice (211) to close it, but the first orifice (211) can be opened when the opening / closing part (70) is operated. The front end (221) of the valve housing (22) inserted into the valve seat (21) has an inclined surface formed thereon to seal the first orifice (211). The rear end of the valve housing (22) contacts the elastic body (42) described later and is elastically supported.

[0046] The elastic member (23) can elastically support the valve housing (22) between the valve seat (21) and the valve housing (22). The elastic member (23) prevents the elastic member (23) from detaching from or buckling the valve housing (22) during the process of compression and extension along the longitudinal direction.

[0047] The spring pin (24) uniformly transmits the elastic restoring force of the elastic member (23) to the tip of the valve housing (22), thereby guiding the tip of the valve housing (22) to be stably seated on the first orifice (211) without eccentricity.

[0048] The ball (25) is seated in the first orifice (211) of the valve seat (21) to form a shielding surface for fluid flowing along the flow path (11). The ball (25) contacts the tip of the valve housing (22) to selectively close or open the first orifice (211) according to the sliding displacement of the valve housing (22), and a uniform shielding force is secured for bidirectional fluid flow by the spherical point contact sealing structure.

[0049] The hex (30) can be coupled to the housing (10) with a portion of the poppet (20) inserted into it from one side. For example, the hex (30) may be formed as a cartridge-shaped fastening medium including a male threaded portion extending longitudinally from one end. The male threaded portion of the hex (30) is screw-coupled to the inner threaded portion of a manifold block provided in hydraulic equipment such as an excavator, forklift, or grader, and the hex (30) allows an operator to firmly fasten or detach the bidirectional valve structure of the present invention to the manifold block using a tool such as a wrench. Accordingly, the bidirectional valve structure of the present invention can be quickly mounted and replaced from the outside of the manifold block in a single operation, so there is no need to disassemble the manifold block or the entire hydraulic line during maintenance.

[0050] The plunger (40) includes a stopper (60) provided on the opposite side of the case (50) and an elastic body (42) that elastically supports a poppet (20) that is provided inside the case (50) and partially inserted into it. The plunger (40) may be made of a magnetic material and slides axially inside the case (50) along the direction of action of the magnetic field formed by applying current to the magnetic field induction unit (C).

[0051] The plunger (40) is formed of a soft magnetic material with low magnetic reluctance so that the magnetic flux generated by the coil is efficiently induced through the plunger (40), and when the action of the magnetic field is released, unintended attachment phenomenon due to residual magnetization may not occur.

[0052] The plunger (40) includes a receiving portion (41) formed by being recessed along the axial direction inside, and a stopper (44) formed on the entrance side of the receiving portion (41). A part of the poppet (20) and the tip side (711) of the operating pin (71) of the opening / closing portion (70) are inserted into the receiving portion (41) from both sides, and an elastic body (42) is interposed between them to elastically transmit displacement from both sides. When the magnetic field induction unit (C) is in a non-energized state, the restoring force of the elastic body (42) presses the poppet (20) toward the valve seat (21) to maintain a normally closed state, and when the magnetic field induction unit (C) is energized, the plunger (40) is attracted toward the stopper (60) by the magnetic field, and the displacement of the plunger (40) is transmitted to the poppet (20) through the elastic body (42), causing the poppet (20) to be separated from the valve seat (21) and the outlet passage (12) can be opened.

[0053] The case (50) can be inserted so that a portion of it protrudes from the other side of the hex (30) through the interior. The case (50) is formed in the shape of a sleeve tube with both ends open and a hollow formed inside to accommodate a plunger (40), and can be formed of a non-magnetic material, for example, non-magnetic stainless steel.

[0054] For example, since the case (50) is formed of a non-magnetic material, the magnetic flux generated by the magnetic field induction unit (C) passes through the thickness direction of the case (50) and does not leak out, and is induced along a magnetic circuit formed through a plunger (40) placed inside the case (50) and a stopper (60) coupled to the end of the case (50). Accordingly, the magnetic flux generated by the current applied to the magnetic field induction unit (C) is efficiently concentrated on the plunger (40), so that the plunger (40) can be quickly attracted even with a small current.

[0055] Additionally, the case (50) is positioned such that its inner surface faces the outer surface of the plunger (40) with a small gap, thereby guiding the plunger (40) to perform a linear sliding motion along the longitudinal direction of the case (50). One end of the case (50) is connected to the hex (30), and the other end is connected to the stopper (60) to form a sealed operating space inside, and this space is filled with hydraulic fluid or a portion of fluid from a hydraulic line to lubricate the friction generated during the sliding of the plunger (40) and to damp the operation of the plunger (40).

[0056] The stopper (60) may be provided on the opposite side of the case (50). The stopper (60) is formed of a magnetic material and can attract magnetic flux formed by the magnetic field induction unit (C). That is, a magnetic attractive force is generated in the air gap between the stopper (60) and the plunger (40), causing the plunger (40) to be pulled toward the stopper (60).

[0057] Additionally, the stopper (60) is positioned on the rear side of the plunger (40) to prevent detachment when the plunger (40) slides backward. When the magnetic field induction unit (C) is energized and the plunger (40) moves backward by magnetic attraction, the movement can be stopped at a position where the rear end surface of the plunger (40) is close to or contacts the front end surface of the stopper (60).

[0058] The opening / closing part (70) includes an operating pin (71) and a knob (72), and passes through the stopper (60) to elastically support the poppet (20) by the elastic body (42) on the opposite side of the poppet (20), and slides the poppet (20) by user operation.

[0059] The operating pin (71) has a front end (711) that passes through the stopper (60) and contacts the elastic body (42), while the opposite rear end (712) protrudes outside the stopper (60).

[0060] The operating pin (71) may include a fastening part (713) having a thread formed between the front side (711) and the rear side (712), and a sealing member (714, 715) formed protruding along the longitudinal direction between the front side (711) and the fastening part (713) such that at least one has a diameter larger than the outer diameter of the operating pin (71).

[0061] The sealing member (714, 715) includes a first sealing projection (714) and a second sealing projection (715) that are sequentially provided from the front side (711) toward the rear side (712).

[0062] Meanwhile, the operating pin (71) may be formed such that the outer diameter (b) between the first sealing projection (714) and the second sealing projection (715) is smaller than the outer diameter (a) of the operating pin (71).

[0063] Additionally, the operating pin (71) includes a locking projection (716) formed between the tip side (711) and the first sealing projection (714) that is larger than the outer diameter of the sealing member.

[0064] At this time, the plunger (40) has a receiving portion (41) formed inside, and the tip of the operating pin (71) is provided in the receiving portion (41), and when the operating pin (71) rises, the locking projection (716) catches on the locking projection (44) to prevent the opening / closing portion (70) from coming off.

[0065] The knob (72) is connected to the rear end (712) and can rotate the operating pin (71) to raise and lower the operating pin (71).

[0066] The magnetic field induction unit (C) includes a solenoid coil positioned to surround the outer circumference of the case (50), and when current is applied from the outside, it forms a magnetic field by an induced electromotive force to move the plunger (40) along the direction of action of the magnetic field. When the plunger (40) moves by the magnetic field induction unit (C), the poppet (20), which has a portion inserted inside the plunger (40), slides together with it, causing the valve housing (22) to be separated from the first orifice (211) of the valve seat (21), and accordingly, the flow path (11) and the outlet flow path (12) are connected so that fluid can flow.

[0067] Hereinafter, the operation of a bidirectional valve structure capable of external manual opening and closing according to the present embodiment will be explained in more detail with reference to FIGS. 3 to 5.

[0068] First, in a normal closed state where no current is applied to the magnetic field induction unit (C), the tip of the valve housing (22) is seated on the first orifice (211) of the valve seat (21) by the restoring force of the elastic member (23), thereby shielding the space between the flow path (11) and the outlet flow path (12). At this time, whether fluid flows from one side of the housing (10) to the other side or flows from the opposite direction, fluid flow in any direction is blocked by the arrangement relationship with the second orifice (212) formed perpendicular to the first orifice (211), thereby maintaining a bidirectional normal closed shielding state.

[0069] Referring to FIG. 4, when current is applied to the magnetic field induction unit (C), a magnetic field is formed in the coil surrounding the outer circumference of the case (50), and the plunger (40) slides in the direction of the stopper (60) by magnetic attraction. When the plunger (40) slides, the elastic body (42) placed inside the receiving portion (41) of the plunger (40) is compressed or deformed by the displacement of the plunger (40), and presses the poppet (20) with its restoring force, and accordingly, the poppet (20) slides in a direction corresponding to the direction of movement of the plunger (40), and the tip of the valve housing (22) is separated from the first orifice (211). As a result, the space between the Euro (11) and the outlet Euro (12) is connected so that fluid can flow, and when the current application to the magnetic field induction unit (C) is cut off, the plunger (40) returns to its original position first by the restoring force of the elastic member (23) and the elastic body (42), and accordingly, the poppet (20) is also re-seated on the valve seat (21) and the normal closed shielding state is restored.

[0070] Meanwhile, referring to FIG. 5, even if an emergency situation occurs where normal electrical operation is difficult due to the coil being disconnected, the power being cut off, or foreign matter attached to the poppet (20), the operator can forcibly open the flow path (11) by rotating the knob (72) protruding from the outside of the stopper (60). That is, when the knob (72) is rotated, the rear end (712) of the operating pin (71) coupled with the knob (72) rotates together, and the fastening part (713) having a screw thread formed between the front end (711) and the rear end (712) of the operating pin (71) raises the operating pin (71) in the axial direction through a screw coupling relationship with the inner screw part of the stopper (60).

[0071] At this time, when the operating pin (71) rises in the opposite direction to the poppet (20), the force pressing the elastic body (42) placed inside the receiving portion (41) of the plunger (40) by the tip side (711) of the operating pin (71) is released, and at the same time, the plunger (40) is pulled upward, and accordingly, the poppet (20) slides to separate the valve housing (22) from the first orifice (211) of the valve seat (21).

[0072] As a result, the poppet (20) slides in the same direction as the operation by applying current to the magnetic field induction unit (C), and the flow path (11) is forcibly opened, so that the pressure accumulated in the line due to the continuous operation of the hydraulic pump can be relieved through the outlet flow path (12), and the worker can immediately return the work machine to a safe state in an emergency situation.

[0073] Additionally, during the process of the operating pin (71) descending or ascending, the first sealing projection (714) and the second sealing projection (715) formed on the outer circumference of the operating pin (71) are respectively in close contact with the inner surface of the stopper (60) or the case (50), thereby blocking the leakage of operating fluid or hydraulic fluid filled inside the case (50) to the outside through the gap between the operating pin (71) and the stopper (60). In particular, the outer diameter (b) between the first sealing projection (714) and the second sealing projection (715) is formed to be smaller than the outer diameter (a) of the operating pin (71), thereby providing an annular lubrication chamber between the two sealing projections, so that two stages of sealing action are maintained independently. Accordingly, even if the knob (72) is rotated repeatedly, external leakage is effectively blocked by the multi-seal structure, and there is an effect of preventing external leakage.

[0074] Additionally, during the process in which the operating pin (71) rises toward the rear end (712), i.e., upward, due to the reverse rotation operation of the knob (72), a catch projection (716) formed between the front end (711) of the operating pin (71) and the first sealing projection (714), which is larger than the outer diameter of the sealing member, catches on a catch projection (44) formed inside the receiving portion (41) of the plunger (40).

[0075] Accordingly, even if the operating pin (71) rises above a certain stroke, it is prevented from being separated or detached from the plunger (40), so that the position of the opening / closing part (70) is stably maintained even after the emergency release operation. When the knob (72) is rotated in the forward direction again, the operating pin (71) descends, and the poppet (20) is seated back into the first orifice (211) by the restoring force of the elastic body (42) and the elastic member (23), automatically returning to the normal closed state, thereby immediately achieving reversible restoration to the normal operating state without separate disassembly or parts replacement.

[0076] Meanwhile, the stopper (60) is fixed to the opposite side of the case (50) by a press-fit or screw connection method, thereby defining the rear stroke limit of the plunger (40) generated by the magnetic field induction unit (C), and at the same time supporting the reaction force of the axial pressure applied by the operating pin (71) according to the rotational operation of the knob (72). Accordingly, the electrical operation stroke by the magnetic field induction unit (C) and the forced opening by manual operation of the opening / closing part (70) can be stably performed within the same stroke range.

[0077] According to the bidirectional valve structure capable of external manual opening and closing according to the present invention, even if the electrical operation of the solenoid valve becomes impossible due to reasons such as a broken coil, power cutoff, or the poppet becoming stuck due to foreign matter, the operator can immediately open the flow path by forcibly sliding the poppet simply by rotating the knob exposed to the outside of the valve. Even when the hydraulic pump continues to operate and the pressure in the line rises, the operator can quickly perform an emergency release, thereby preventing secondary safety accidents caused by hose rupture, seal breakage, manifold block damage, or unintended movement of the working machine, thus improving safety. The same sealing reliability is ensured whether the fluid flow is from one side to the other or in the opposite direction. Compared to a unidirectional valve, the burden of managing parts types and inventory is reduced. Compatibility is improved, allowing for application to various hydraulic circuit configurations within the same manifold block. Additionally, durability is enhanced as a lubrication chamber is formed in the operating pin, allowing for independent maintenance of two-stage sealing action and blocking external leakage.

[0078] Although embodiments of the present invention have been described in more detail with reference to the attached drawings, the present invention is not necessarily limited to these embodiments and may be modified in various ways within the scope of the technical spirit of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of protection of the present invention shall be interpreted by the claims below, and all technical spirits within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0079] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below. Explanation of the symbols

[0081] 10: Housing 20: Four Fit 30: Hex 40: Plunger 50: Case 60: Stopper 70: Opening / closing part C: Magnetic field induction unit

Claims

Claim 1 A housing having a channel formed in the longitudinal direction; a poppet provided on the channel of the housing and sliding along the direction of the channel to open and close the channel; a hex coupled to the housing with a portion of the poppet inserted into it from one side; a case with a through-hole and inserted so that a portion protrudes from the other side of the hex; a stopper provided on the opposite side of the case; and a plunger provided inside the case and including an elastic body that elastically supports the poppet partially inserted into it. A bidirectional valve structure capable of external manual opening and closing, comprising: an opening and closing part that passes through the stopper and elastically supports the poppet by the elastic body on the opposite side of the poppet, and slides the poppet by user operation; wherein the housing includes an outlet passage that penetrates radially from the flow path and discharges fluid flowing along the flow path to the outside; and the poppet includes a valve seat comprising a first orifice that penetrates the interior parallel to the outlet passage and a second orifice formed perpendicularly from the first orifice and arranged parallel to the outlet passage, a valve housing having a tip inserted into the interior of the valve seat that contacts the first orifice to close it, and opens the first orifice when the opening and closing part is operated, and an elastic member that elastically supports the valve housing between the valve seat and the valve housing. Claim 2 delete Claim 3 A bidirectional valve structure capable of external manual opening and closing, wherein the opening and closing portion comprises: a knob coupled to the rear end of an operating pin, the front end of which passes through the stopper and contacts the elastic body, and the rear end of which is opposite and protrudes to the outside of the stopper; and wherein the operating pin comprises a fastening portion having screw threads formed between the front end and the rear end, and a sealing member formed protruding along the longitudinal direction between the front end and the fastening portion, having a diameter larger than the outer diameter of the operating pin.

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