Proportional pilot valve and water-based proportional reversing valve with same

Abstract

The utility model relates to the technical field of proportional pilot valves, and provides a proportional pilot valve and a water-based proportional reversing valve, the proportional pilot valve comprises a pilot valve body, a pilot valve core, a proportional electromagnet and an electromagnet controller, the pilot valve core is arranged in the pilot valve body, and the pilot valve core is provided with a valve core cavity; a first liquid inlet, a second liquid inlet and a liquid outlet are formed in the pilot valve element, the pilot valve element comprises a valve seat, a steel ball, a spring and an ejector rod, the valve seat is provided with an axially-through liquid passing channel, and the steel ball is movably installed on the first side of the liquid passing channel and connected with the valve element cavity through the spring. One end of the ejector rod penetrates through the liquid passing channel from the second side of the liquid passing channel to be connected with the steel ball, the other end of the ejector rod is connected with the proportion electromagnet, the proportion electromagnet is connected with the electromagnet controller, the first liquid inlet is formed in the first side of the liquid passing channel, the second liquid inlet and the liquid outlet are formed in the second side of the liquid passing channel, and the liquid outlet is arranged close to the liquid passing channel. The utility model can meet the explosion-proof performance requirements of coal mines and other application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of proportional pilot valve technology, specifically to a proportional pilot valve and a water-based proportional directional valve having the same. Background Technology

[0002] Existing proportional pilot valves for coal mines typically control the displacement of the valve core using a proportional electromagnet. This requires a large proportional electromagnet thrust to move the valve core, and the large thrust requires a large current, which cannot meet the explosion-proof performance requirements for mining applications. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a proportional pilot valve and a water-based proportional directional valve having the same, so as to at least solve the technical problem that the proportional pilot valve in the prior art cannot meet the explosion-proof performance requirements for mining.

[0004] To solve the above-mentioned technical problems, the embodiments of this utility model adopt the following technical solutions:

[0005] In a first aspect, embodiments of the present invention provide a proportional pilot valve, comprising a pilot valve body, a pilot valve core, a proportional electromagnet, and an electromagnet controller. The pilot valve core is disposed within the pilot valve body and has a valve core cavity. The pilot valve core is provided with a first inlet, a second inlet, and an outlet respectively communicating with the valve core cavity.

[0006] The pilot valve core includes a valve seat, a steel ball, a spring, and a push rod. At least a portion of the valve seat is located within the valve core cavity. The steel ball, spring, and push rod are located within the valve core cavity. The valve seat has an axially penetrating liquid passage. The steel ball is movably mounted on a first side of the liquid passage and connected to the valve core cavity via the spring. One end of the push rod passes through the liquid passage from a second side and is connected to the steel ball. The other end of the push rod is connected to a proportional electromagnet. The proportional electromagnet is connected to an electromagnet controller. The first liquid inlet is located on the first side of the liquid passage, and the second liquid inlet and the liquid outlet are located on the second side of the liquid passage, with the liquid outlet positioned close to the liquid passage.

[0007] In some embodiments, the valve core cavity is provided with a first inlet cavity communicating with the first inlet port and a second inlet cavity communicating with the second inlet port, wherein the cross-sectional area of ​​the first inlet cavity is larger than the cross-sectional area of ​​the second inlet cavity.

[0008] In some embodiments, the pilot valve core further includes a threaded sleeve and a valve core guide sleeve. The threaded sleeve, the valve seat, and the valve core guide sleeve are sequentially connected to define the valve core cavity. The threaded sleeve is connected to a first side of the valve seat to form a first valve core cavity, and a second side of the valve seat is connected to the valve core guide sleeve to form a second valve core cavity. The steel ball and the spring are disposed in the first valve core cavity, and the push rod is disposed in the second valve core cavity.

[0009] In some embodiments, the first liquid inlet is located on the threaded sleeve, and the second liquid inlet is located on the valve core guide sleeve.

[0010] In some embodiments, the pilot valve core further includes a ball seat, one end of which is connected to the inner wall of the valve core cavity via the spring, and the other end of which is provided with a mounting groove for mounting the steel ball.

[0011] In some embodiments, a guide portion is provided on the side of the liquid passage near the liquid outlet.

[0012] In some embodiments, a sliding sleeve is provided around the outer periphery of the push rod, and the outer wall of the sliding sleeve is connected to the inner wall of the valve core cavity.

[0013] In some embodiments, the proportional pilot valve further includes an amplifying lever, one side of which is connected to the proportional electromagnet, and the other side of which is connected to the push rod.

[0014] In some embodiments, the pilot valve core is provided with a first inlet channel connecting the first inlet port and the second inlet port.

[0015] Secondly, this utility model embodiment provides a water-based proportional directional valve, including a directional valve body, an inlet valve core, and the aforementioned proportional pilot valve. The directional valve body is provided with an inlet, the inlet valve core is disposed in the directional valve body, the inlet and the inlet control chamber of the inlet valve core are connected through a damping orifice, and the first inlet of the proportional pilot valve is connected to the inlet pipeline between the damping orifice and the inlet control chamber of the inlet valve core.

[0016] This utility model provides a proportional pilot valve and a water-based proportional directional valve having the same. The proportional pilot valve comprises a pilot valve body, a pilot valve core, a proportional electromagnet, and an electromagnet controller. The pilot valve core is disposed within the pilot valve body and has a valve core cavity. The pilot valve core has a first inlet, a second inlet, and an outlet respectively communicating with the valve core cavity. The pilot valve core includes a valve seat, a steel ball, a spring, and a push rod. At least a portion of the valve seat is located within the valve core cavity. The steel ball, spring, and push rod are located within the valve core cavity. The valve seat has an axially penetrating liquid passage. The steel ball is movably mounted on the first side of the liquid passage and connected to the valve core cavity via the spring. One end of the push rod passes through the liquid passage from the second side and connects to the steel ball. The other end of the push rod is connected to the proportional electromagnet, which is connected to the electromagnet controller. The first liquid inlet is located on the first side of the liquid passage, and the second liquid inlet and the liquid outlet are located on the second side of the liquid passage, with the liquid outlet positioned close to the liquid passage. The proportional pilot valve can operate normally with only a small current, meeting the explosion-proof performance requirements of applications such as coal mines and improving the applicability of the proportional pilot valve. At the same time, the combination of spring force and hydraulic force ensures that the proportional pilot valve is in the closed state under natural conditions, improving the reliability of the proportional pilot valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the proportional pilot valve according to an embodiment of the present invention;

[0019] Figure 2 This is an enlarged structural schematic diagram of the pilot valve core of the proportional pilot valve according to an embodiment of the present utility model;

[0020] Figure 3 This is a partial structural schematic diagram of the water-based proportional directional valve according to an embodiment of the present invention. Figure 3 The middle arrow indicates the direction of liquid flow.

[0021] Figure label:

[0022] 100 - Proportional pilot valve; 10 - Pilot valve body; 20 - Pilot valve core; 201 - Valve core cavity; 2011 - First valve core cavity; 2012 - Second valve core cavity; 202 - First inlet; 203 - Second inlet; 204 - Outlet; 205 - First inlet chamber; 206 - Second inlet chamber; 207 - Second inlet channel; 30 - Proportional electromagnet; 40 - Electromagnet controller; 50 - Amplifying lever; 60 - Reversing valve body; 601 - Inlet; 602 - Damping orifice; 603 - First pipeline; 604 - Second pipeline; 605 - Second end of the second pipeline;

[0023] 1-Valve seat, 11-Liquid passage, 12-Guide part; 2-Steel ball; 3-Spring; 4-Push rod; 5-Threaded sleeve; 6-Valve core guide sleeve; 7-Ball seat, 71-Mounting groove, 72-Connecting column; 8-Sliding sleeve. Detailed Implementation

[0024] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0025] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0026] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0027] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0028] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0029] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0030] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0031] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0032] Example 1

[0033] Figure 1 and Figure 2 A schematic diagram of the proportional pilot valve according to an embodiment of the present invention is shown. Figure 3 A schematic diagram of a water-based directional valve having a proportional pilot valve according to an embodiment of the present invention is shown. Figures 1 to 3 As shown in the figure, a proportional pilot valve 100 provided in this embodiment of the present invention includes a pilot valve body 10, a pilot valve core 20, a proportional electromagnet 30, and an electromagnet controller 40. The pilot valve core 20 is disposed within the pilot valve body 10 and has a valve core cavity 201. The pilot valve core 20 has a first inlet 202, a second inlet 203, and an outlet 204 respectively communicating with the valve core cavity 201. The pilot valve core 20 includes a valve seat 1, a steel ball 2, a spring 3, and a push rod 4. At least a portion of the valve seat 1 is located within the valve core cavity 201. The steel ball 2, spring 3, and push rod 4 are located within the valve core cavity 201. 1. It has an axially penetrating liquid passage 11. The steel ball 2 is movably installed on the first side of the liquid passage 11 and connected to the valve core cavity 201 through the spring 3. One end of the push rod 4 passes through the liquid passage 11 from the second side and is connected to the steel ball 2. The other end of the push rod 4 is connected to the proportional electromagnet 30. The proportional electromagnet 30 is connected to the electromagnet controller 40. The first liquid inlet 202 is located on the first side of the liquid passage 11. The second liquid inlet 203 and the liquid outlet 204 are located on the second side of the liquid passage 11, and the liquid outlet 204 is located close to the liquid passage 11.

[0034] Specifically, the first inlet 202, the second inlet 203, and the outlet 204 are radially arranged along the pilot valve core 20. When the proportional pilot valve 100 is in its natural state (the proportional electromagnet 30 is de-energized), the spring 3 applies a certain pre-pressure (e.g., towards the liquid passage 11) to the steel ball 2 from the first side of the liquid passage 11 (or valve seat 1). Figure 2 The pre-pressure from the center to the right), and the liquid enters the valve core cavity 201 from the first inlet 202 located on the first side of the liquid passage 11, can also apply a certain hydraulic pressure (e.g., towards the liquid passage 11) to the steel ball 2. Figure 2 The steel ball 2, under the pre-pressure of the spring 3 and the hydraulic pressure of the liquid entering the valve core cavity 201 from the first inlet 202, presses against the valve seat 1, thereby closing the valve port on the first side of the liquid passage 11 (the side connected to the first inlet 202), isolating the high-pressure side (the side connected to the first inlet 202) and the low-pressure side (the side connected to the outlet 204) of the proportional pilot valve 100.

[0035] When the electromagnet controller 40 controls the proportional electromagnet 30 to be energized, the proportional electromagnet 30 pushes the push rod 4 from the second side of the liquid passage 11 (or valve seat 1) towards the steel ball 2 (e.g.) Figure 2 The push rod 4 moves to the left and comes into contact with the steel ball 2, pushing the steel ball 2 away from the valve seat 1. This opens the valve port on the first side of the liquid passage 11, connecting the first inlet 202, the liquid passage 11, and the second inlet 203. Liquid entering the valve core cavity 201 through the first inlet 202 flows out through the outlet 204. The greater the thrust of the proportional electromagnet 30, the greater the force of the push rod 4 in pushing the steel ball 2 away from the valve seat 1, and the greater the opening of the valve port on the first side of the liquid passage 11. Thus, the valve opening can be proportionally controlled according to the thrust of the proportional electromagnet 30. The outlet 204 is connected to the liquid tank for return liquid. The liquid can be a water-based working medium or a hydraulic oil, etc. At the same time, since some liquid can enter the valve core cavity 201 from the second inlet 203 on the second side of the liquid passage 11, it can provide a certain hydraulic pressure (e.g., towards the steel ball 2) to the push rod 4. Figure 2 (The hydraulic pressure is from left to right). Therefore, the proportional electromagnet 30 only needs to apply a small thrust to control the valve port on the first side of the liquid passage 11 to open. That is, the proportional pilot valve 100 only needs to provide a small current to operate normally, meeting the explosion-proof performance requirements of applications such as coal mines and improving the applicability of the proportional pilot valve 100. In other words, the proportional pilot valve 100 is an intrinsically safe proportional pilot valve.

[0036] It is understandable that when the proportional pilot valve 100 is in its natural state, although the liquid can enter the valve core cavity 201 on the second side of the liquid passage 11 through the second inlet 203 and apply a certain hydraulic pressure towards the steel ball 2 from the second side of the liquid passage 11 to push the steel ball 2 away from the valve seat 1, the steel ball 2 is still subject to the spring force, which ensures that the steel ball 2 is pressed on the valve seat 1.

[0037] In some embodiments, the valve core cavity 201 is provided with a first inlet cavity 205 communicating with the first inlet port 202 and a second inlet cavity 206 communicating with the second inlet port 203. The cross-sectional area of ​​the first inlet cavity 205 is larger than that of the second inlet cavity 206. This ensures that the hydraulic pressure from the first side of the liquid passage 11 toward the steel ball 2 is greater than the hydraulic pressure from the second side of the liquid passage 11 toward the steel ball 2, guaranteeing that when the proportional pilot valve 100 is in its natural state, the steel ball 2 abuts against the valve seat 1, closing the valve port and ensuring the reliability of the proportional pilot valve 100.

[0038] In some embodiments, such as Figure 2 As shown, the pilot valve core 20 also includes a threaded sleeve 5 and a valve core guide sleeve 6. The threaded sleeve 5, valve seat 1, and valve core guide sleeve 6 are sequentially connected to define the valve core cavity 201. The threaded sleeve 5 is connected to the first side of the valve seat 1 to form a first valve core cavity 2011, and the second side of the valve seat 1 is connected to the valve core guide sleeve 6 to form a second valve core cavity 2012. The steel ball 2 and the spring 3 are disposed in the first valve core cavity 2011, and the push rod 4 is disposed in the second valve core cavity 2012. This arrangement facilitates the assembly and disassembly of the components of the pilot valve core 20. For example, the steel ball 2 can be connected to the threaded sleeve 5 via the spring 3 and then assembled to the first side of the valve seat 1; the push rod 4 can be pre-assembled with the valve core guide sleeve 6 and then connected to the second side of the valve seat 1.

[0039] In this embodiment, the valve seat 1 is partially disposed within the valve core cavity 201, facilitating connection with the threaded sleeve 5 and the valve core guide sleeve 6 via the radially outer side of the valve seat 1. Furthermore, the overall structure after connection with the threaded sleeve 5 and the valve core guide sleeve 6 is reasonable and compactly arranged. In a specific implementation, the pilot valve core 20 can also be an integral structure with a valve core cavity 201, with the entire valve seat 1 disposed within the valve core cavity 201.

[0040] In some embodiments, the first liquid inlet 202 is provided on the threaded sleeve 5, and the second liquid inlet 203 is provided on the valve core guide sleeve 6, which has a reasonable structure and is easy to process.

[0041] In some embodiments, the pilot valve core 20 further includes a ball seat 7, one end of which is connected to the inner wall of the valve core cavity 201 via the spring 3, and the other end of which is provided with a mounting groove 71 for mounting the steel ball 2.

[0042] One end of the ball seat 7 is provided with a connecting post 72 that is connected to the spring 3, and the spring 3 is sleeved on the connecting post 72; the other end of the ball seat 7 is provided with an installation groove 71, which can limit the axial movement of the steel ball 2, prevent the steel ball 2 from moving arbitrarily, and ensure the reliability of the pilot valve.

[0043] In some embodiments, such as Figure 2 As shown, the liquid passage 11 has a guide portion 12 on the side near the liquid outlet 204, which allows the liquid to flow out of the liquid outlet 204 quickly after passing through the liquid passage 11, thereby improving the response speed of the proportional pilot valve 100. The guide portion 12 is preferably a conical surface.

[0044] In some embodiments, such as Figure 2 As shown, a sliding sleeve 8 is fitted around the outer periphery of the push rod 4, and the outer wall of the sliding sleeve 8 is connected to the inner wall of the valve core cavity 201. The sliding sleeve 8 can guide and limit the axial movement of the push rod 4, and the connection between the outer wall of the sliding sleeve 8 and the inner wall of the valve core cavity 201 ensures that the push rod 4 is reliably installed in the valve core cavity 201.

[0045] In some embodiments, such as Figure 1 As shown, the proportional pilot valve also includes an amplifying lever 50. One side of the amplifying lever 50 is connected to the proportional electromagnet 30, and the other side of the amplifying lever 50 is connected to the push rod 4. The thrust required to push the push rod 4 is further reduced by the amplifying lever 50, which further reduces the attraction force required by the proportional electromagnet 30. Ultimately, the proportional pilot valve can operate normally with only tens to hundreds of milliamps of operating current, meeting the explosion-proof requirements of coal mines.

[0046] In some embodiments, the pilot valve core 20 is provided with a first liquid inlet channel (not shown in the figure) connecting the first liquid inlet 202 and the second liquid inlet 203 to facilitate liquid inlet. For example, the first liquid inlet 202 is connected to an external liquid supply device. After the liquid enters the valve core cavity 201 through the first liquid inlet 202, part of the liquid enters the first liquid inlet cavity 205 to apply hydraulic pressure to the steel ball 2, and the other part enters the second liquid inlet 203 through the first liquid inlet channel, and then enters the second liquid inlet cavity 206.

[0047] In other embodiments, the first liquid inlet 202 and the second liquid inlet 203 can be used for liquid intake separately. For example, as Figure 1 As shown, an independent second inlet channel 207 that communicates with the second inlet port 203 can be machined inside the pilot valve body 10.

[0048] like Figure 1As shown, multiple pilot valve cores 20 can be installed within the same pilot valve body 10. Each pilot valve core 20 corresponds to a proportional electromagnet 30. Multiple proportional electromagnets 30 are controlled by the same electromagnet controller 40, which in turn controls multiple pilot valve cores 20, allowing simultaneous control of multiple controlled components. In other words, the same proportional pilot valve 100 can control multiple controlled components, facilitating on-site installation and use.

[0049] like Figure 3 As shown in the figure, this utility model embodiment also provides a water-based proportional directional valve, including a directional valve body 60, an inlet valve core, and the aforementioned proportional pilot valve 100. The directional valve body 60 is provided with an inlet 601, and the inlet valve core is disposed inside the directional valve body 60. The inlet 601 and the inlet control chamber of the inlet valve core are connected through a damping hole 602. The first inlet port 202 of the proportional pilot valve 100 is connected to the inlet pipeline between the damping hole 602 and the inlet control chamber of the inlet valve core.

[0050] Specifically, inlet 601 is connected to one end of damping orifice 602 via first pipe 603, and the other end of damping orifice 602 is connected to the inlet control chamber of inlet valve core via second pipe 604. That is, the first end of second pipe 604 is connected to damping orifice 602, and the second end 605 of second pipe 604 is used to connect to the inlet control chamber of inlet valve core. The first inlet 202 of proportional pilot valve 100 is connected to second pipe 604.

[0051] Due to the function of the damping orifice 602, a pressure difference is formed between the inlet 601 and the inlet control chamber of the inlet valve core. Thus, the pressure in the inlet control chamber can be controlled by matching the flow relationship between the damping orifice 602 and the proportional pilot valve 100, and the opening degree of the inlet valve core can be controlled, thereby realizing the proportional switching of the water-based proportional directional valve and providing the control accuracy and response speed of the water-based proportional directional valve.

[0052] The proportional pilot valve 100 of this utility model embodiment can also be applied to other controlled components. The specific application scenarios of the proportional pilot valve 100 are not specifically limited by this utility model.

[0053] The water-based proportional directional valve provided in this embodiment corresponds to the proportional pilot valve in the above embodiment. Any option in the proportional pilot valve embodiment is also applicable to the water-based proportional directional valve embodiment, and will not be repeated here.

[0054] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

[0055] Furthermore, although the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0056] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A proportional pilot valve, characterized in that, The system includes a pilot valve body, a pilot valve core, a proportional electromagnet, and an electromagnet controller. The pilot valve core is disposed within the pilot valve body and has a valve core cavity. The pilot valve core has a first inlet, a second inlet, and an outlet that are respectively connected to the valve core cavity. The pilot valve core includes a valve seat, a steel ball, a spring, and a push rod. At least a portion of the valve seat is located within the valve core cavity. The steel ball, spring, and push rod are located within the valve core cavity. The valve seat has an axially penetrating liquid passage. The steel ball is movably mounted on a first side of the liquid passage and connected to the valve core cavity via the spring. One end of the push rod passes through the liquid passage from a second side and is connected to the steel ball. The other end of the push rod is connected to a proportional electromagnet. The proportional electromagnet is connected to an electromagnet controller. The first liquid inlet is located on the first side of the liquid passage, and the second liquid inlet and the liquid outlet are located on the second side of the liquid passage, with the liquid outlet positioned close to the liquid passage.

2. The proportional pilot valve according to claim 1, characterized in that, The valve core cavity is provided with a first inlet cavity communicating with the first inlet port and a second inlet cavity communicating with the second inlet port. The cross-sectional area of ​​the first inlet cavity is larger than that of the second inlet cavity.

3. The proportional pilot valve according to claim 1, characterized in that, The pilot valve core further includes a threaded sleeve and a valve core guide sleeve. The threaded sleeve, valve seat, and valve core guide sleeve are sequentially connected to define the valve core cavity. The threaded sleeve is connected to the first side of the valve seat to form a first valve core cavity. The second side of the valve seat is connected to the valve core guide sleeve to form a second valve core cavity. The steel ball and the spring are disposed in the first valve core cavity, and the push rod is disposed in the second valve core cavity.

4. The proportional pilot valve according to claim 3, characterized in that, The first liquid inlet is located on the threaded sleeve, and the second liquid inlet is located on the valve core guide sleeve.

5. The proportional pilot valve according to claim 1, characterized in that, The pilot valve core also includes a ball seat, one end of which is connected to the inner wall of the valve core cavity via the spring, and the other end of which is provided with a mounting groove for mounting the steel ball.

6. The proportional pilot valve according to claim 1, characterized in that, The liquid passage is provided with a guide on the side near the liquid outlet.

7. The proportional pilot valve according to claim 3, characterized in that, The outer periphery of the push rod is fitted with a sliding sleeve, and the outer wall of the sliding sleeve is connected to the inner wall of the valve core cavity.

8. The proportional pilot valve according to claim 1, characterized in that, The proportional pilot valve also includes an amplifying lever, one side of which is connected to the proportional electromagnet, and the other side of which is connected to the push rod.

9. The proportional pilot valve according to claim 1, characterized in that, The pilot valve core is provided with a first inlet channel that connects the first inlet port and the second inlet port.

10. A water-based proportional directional valve, characterized in that, The device includes a directional valve body, an inlet valve core, and a proportional pilot valve according to any one of claims 1-9. The directional valve body is provided with an inlet, the inlet valve core is disposed in the directional valve body, the inlet and the inlet control chamber of the inlet valve core are connected through a damping orifice, and the first inlet port of the proportional pilot valve is connected to the inlet pipeline between the damping orifice and the inlet control chamber of the inlet valve core.

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