A two-position four-way solenoid valve

Abstract

The present invention relates to the technical field of solenoid valves, and discloses a two-position four-way solenoid valve, comprising a valve body, a first valve core and a second valve core, wherein the first valve core and the second valve core both have a hollow portion connected at the upper and lower ends, and the valve body is provided with a first valve cavity, a second valve cavity, an air inlet, a first working port, a second working port and an exhaust port; the first valve cavity comprises a first sliding cavity, a first piston cavity and a first connecting cavity which are connected to each other, the first sliding cavity is connected to the air inlet, the first connecting cavity is connected to the first working port, the first valve core comprises a first upper valve stem, a first piston portion and a first lower valve stem which are arranged in sequence, the first upper valve stem is slidably matched with the first sliding cavity, and the first piston portion is slidably matched with the first piston cavity; the two-position four-way solenoid valve provided by the present invention solves the problem that the existing two-position four-way valve cannot obtain all three of coil power, valve working pressure and flow rate.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a two-position four-way solenoid valve. Background Art

[0002] The existing two-position four-way valve, whether direct-acting or pilot-operated, must overcome the medium pressure to move the valve core, increasing the resistance of the valve core movement. Under the working condition of large pressure difference, to ensure the normal operation of the valve, either increase its starting power, which will greatly reduce the life of the device, or sacrifice the valve core stroke to limit the flow capacity, which leads to the inability to obtain the coil power, valve working pressure and flow at the same time. Summary of the invention

[0003] The object of the present invention is to provide a two-position four-way solenoid valve to solve at least one of the above problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A two-position four-way solenoid valve comprises a valve body, a first valve core and a second valve core, wherein the first valve core and the second valve core both have a hollow portion with upper and lower ends connected, and the valve body is provided with a first valve cavity, a second valve cavity, an air inlet, a first working port, a second working port and an exhaust port;

[0006] The first valve cavity comprises a first sliding cavity, a first piston cavity and a first communicating cavity which are interconnected, the first sliding cavity is communicated with the air inlet, the first communicating cavity is communicated with the first working port, the first valve core comprises a first upper valve stem, a first piston part and a first lower valve stem which are arranged in sequence, the first upper valve stem is slidably matched with the first sliding cavity, the first piston part is slidably matched with the first piston cavity, the first lower valve stem is located in the first communicating cavity, a first spring is sleeved on the first lower valve stem, and the first spring is arranged between the first piston part and the lower end wall of the first communicating cavity;

[0007] The second valve chamber comprises a second sliding chamber, a second piston chamber and a second communicating chamber which are interconnected, the second sliding chamber is communicated with the exhaust port, the second communicating chamber is communicated with the second working port, the second valve core comprises a second lower valve stem, a second piston portion and a second upper valve stem which are sequentially arranged, the second lower valve stem is slidably matched with the second sliding chamber, the second piston portion is slidably matched with the second piston chamber, the second upper valve stem is located in the second communicating chamber, a second spring is sleeved on the second upper valve stem, and the second spring is arranged between the second piston portion and the upper end wall of the second communicating chamber;

[0008] An upper communicating hole is provided between the first sliding chamber and the second communicating chamber, a middle communicating hole is provided between the high-pressure chambers of the first piston chamber and the second piston chamber, and a lower communicating hole is provided between the first communicating chamber and the second sliding chamber.

[0009] Traditional valve cores all adopt solid structures, and make air path between the solid valve core and the valve body, and the path is small. In this technical solution, the first valve core and the second valve core both have a hollow part connected at the upper and lower ends, and the two valve cores are set as hollow structures, the hollow part is the air path, and the first valve core includes a first upper valve stem, a first piston part and a first lower valve stem arranged in sequence, and the second valve core includes a second lower valve stem, a second piston part and a second upper valve stem arranged in sequence. The piston part and the air path are integrated on the first valve core and the second valve core. Compared with the existing solid valve core design with an air path around it, the hollow valve core of this technical solution has a larger path, a stronger conduction ability, and a simple internal air path, small resistance to gas, small medium resistance to valve core movement, and faster response. This design has smaller movement resistance, faster response, reduces the spring force used for sealing reset, and transfers the force that the spring should bear to the valve core tube wall, so that the coil power, valve working pressure and flow rate are achieved at the same time. This technical solution integrates the piston, valve core, piston chamber and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and convenient processing. The solenoid valve of this technical solution adopts a simple and reliable structure, which makes it easy to install, simple to maintain, small in size, and can work for a long time. It can supply air to the first working port and the second working port separately when the power is off or on.

[0010] Furthermore, in order to provide a pilot structure that facilitates the driving of the valve core without increasing the power of the electromagnet, a pilot magnetic head mounting position, a pilot air inlet air path and a pilot exhaust air path are provided on the valve body, and the valve body is connected to a pilot electromagnetic head (not shown in the figure) through the pilot magnetic head mounting position, and the two ends of the pilot air inlet air path are respectively connected to the air inlet and the pilot magnetic head mounting position, and the two ends of the pilot exhaust air path are respectively connected to the pilot magnetic head mounting position and the first piston chamber.

[0011] Furthermore, upper sealing structures and lower sealing structures are provided between the two ends of the first valve core and the valve body, and between the two ends of the second valve core and the valve body. When the high-pressure air inlet is connected to the first working port and the second working port, it can be self-sealed, thereby enhancing the sealing performance and preventing leakage.

[0012] Furthermore, in order to achieve a higher sealing effect, the upper sealing structure and the lower sealing structure both include a sealing gasket groove, and a sealing gasket is arranged in the sealing gasket groove.

[0013] Furthermore, in order to increase the reliability of end face sealing, the upper sealing structure and the lower sealing structure both include an upper sealing ring and a lower sealing ring with a triangular cross-section, and the upper sealing ring and the lower sealing ring are respectively arranged at the two ends of the first valve cavity and the second valve cavity, and the upper sealing ring and the lower sealing ring are respectively connected to the corresponding sealing gaskets.

[0014] Further, in order to facilitate the installation of the second valve core, the second spring and the valve body, and to facilitate the molding of the pilot air inlet path and the pilot air outlet path, an upper mounting groove is provided at the upper end of the valve body, the second valve cavity is communicated with the upper mounting groove, a pilot upper cover is installed in the upper mounting groove, and the second spring is arranged between the pilot upper cover and the second piston part;

[0015] The pilot air intake path includes a first air intake path and a second air intake path which are interconnected. The pilot head mounting position and the first air intake path are both formed on the pilot upper cover. The first air intake path is connected to the pilot head mounting position. The second air intake path is formed on the valve body. The second air intake path is connected to the air inlet.

[0016] Furthermore, in order to improve the sealing performance between the pilot upper cover and the second valve chamber, the pilot air intake air path and the pilot exhaust air path, a first sealing ring groove, a second sealing ring groove and a third sealing ring groove are provided in the upper mounting groove, the first sealing ring groove is coaxially arranged around the second air intake air path, and a first sealing ring is provided in the first sealing ring groove; the second sealing ring groove is coaxially arranged around the pilot exhaust air path, and a second sealing ring is provided in the second sealing ring groove; the third sealing ring groove is coaxially arranged around the second valve chamber, and a third sealing ring is provided in the third sealing ring groove.

[0017] Furthermore, in order to facilitate the installation of the first valve core, the first spring and the valve body, a lower installation groove is provided at the lower end of the valve body, the lower end of the first valve cavity is connected to the lower installation groove, a lower cover is installed in the lower installation groove, and the first spring is arranged between the lower cover and the first piston part.

[0018] Furthermore, in order to improve the sliding sealing effect between the piston part and the piston cavity, the outer peripheries of the first piston part and the second piston part are provided with piston sealing ring grooves, and piston sealing rings are provided in the piston sealing ring grooves.

[0019] Furthermore, in order to improve the sliding sealing effect between the valve stem and the sliding cavity, the outer peripheries of the first upper valve stem and the second lower valve stem are each provided with a valve stem groove, and a valve stem sealing ring is provided in the valve stem groove.

[0020] The beneficial effects of the present invention are as follows: the conventional valve cores all adopt a solid structure, and an air path is made between the solid valve core and the valve body, and the path is small. In the present technical scheme, the first valve core and the second valve core both have a hollow part connected at the upper and lower ends, and the two valve cores are both set as a hollow structure, the hollow part is an air path, and the first valve core includes a first upper valve stem, a first piston part and a first lower valve stem arranged in sequence, and the second valve core includes a second lower valve stem, a second piston part and a second upper valve stem arranged in sequence, and the piston part and the air path are integrated on the first valve core and the second valve core as a whole. Compared with the existing solid valve core design with an air path around, the hollow valve core of the present technical scheme has a larger path, a stronger conduction capacity, and a simple internal air path, small resistance to gas, small medium resistance to valve core movement, and faster response. The present design has smaller movement resistance, faster response, reduced spring force for sealing reset, and the force that the spring should bear is transferred to the valve core tube wall, so that the coil power, valve working pressure and flow are achieved at the same time. This technical solution integrates the piston, valve core, piston chamber and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and convenient processing. The solenoid valve of this technical solution adopts a simple and reliable structure, which makes it easy to install, simple to maintain, small in size, and can work for a long time. It can supply air to the first working port and the second working port separately when the power is off or on. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0024] Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0025] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure at the middle BB;

[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the valve body in the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the first valve core and the second valve core in the present invention;

[0028] Figure 8 It is a structural schematic diagram of the air inlet and the second working port being connected in the present invention;

[0029] In the figure: valve body 1; first valve core 2; first upper valve stem 2.1; first piston part 2.2; first lower valve stem 2.3; second valve core 3; second lower valve stem 3.1; second piston part 3.2; second upper valve stem 3.3; hollow part 4; air inlet 5; first working port 6; second working port 7; exhaust port 8; first sliding chamber 9; first piston chamber 10; first connecting chamber 11; first spring 12; second sliding chamber 13; second piston chamber 14; second connecting chamber 15; second spring 16; upper Upper connecting hole 17; middle connecting hole 18; high pressure chamber 19; lower connecting hole 20; pilot head mounting position 21; pilot air intake path 22; first air intake path 22.1; second air intake path 22.2; pilot air intake path 23; sealing gasket groove 24; upper sealing ring 25; lower sealing ring 26; upper mounting groove 27; pilot upper cover 28; first sealing ring groove 29; second sealing ring groove 30; lower mounting groove 31; lower cover 32; piston sealing ring groove 33; valve stem groove 34; third sealing ring groove 35. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0031] Embodiment 1:

[0032] like Figure 1-Figure 8 As shown, this embodiment provides a two-position four-way solenoid valve, including a valve body 1, a first valve core 2 and a second valve core 3, the first valve core 2 and the second valve core 3 both have a hollow portion 4 connected at the upper and lower ends, and the valve body 1 is provided with a first valve cavity, a second valve cavity, an air inlet 5, a first working port 6, a second working port 7 and an exhaust port 8;

[0033] The first valve chamber comprises a first sliding chamber 9, a first piston chamber 10 and a first connecting chamber 11 which are interconnected, the first sliding chamber 9 is connected to the air inlet 5, the first connecting chamber 11 is connected to the first working port 6, the first valve core 2 comprises a first upper valve stem 2.1, a first piston part 2.2 and a first lower valve stem 2.3 which are arranged in sequence, the first upper valve stem 2.1 is slidably matched with the first sliding chamber 9, the first piston part 2.2 is slidably matched with the first piston chamber 10, the first lower valve stem 2.3 is located in the first connecting chamber 11, the first lower valve stem 2.3 is sleeved with a first spring 12, and the first spring 12 is arranged between the first piston part 2.2 and the lower end wall of the first connecting chamber 11;

[0034] The second valve chamber comprises a second sliding chamber 13, a second piston chamber 14 and a second connecting chamber 15 which are interconnected, the second sliding chamber 13 is connected to the exhaust port 8, the second connecting chamber 15 is connected to the second working port 7, the second valve core 3 comprises a second lower valve stem 3.1, a second piston portion 3.2 and a second upper valve stem 3.3 which are arranged in sequence, the second lower valve stem 3.1 is slidably matched with the second sliding chamber 13, the second piston portion 3.2 is slidably matched with the second piston chamber 14, the second upper valve stem 3.3 is located in the second connecting chamber 15, the second upper valve stem 3.3 is sleeved with a second spring 16, and the second spring 16 is arranged between the second piston portion 3.2 and the upper end wall of the second connecting chamber 15;

[0035] An upper communicating hole 17 is provided between the first sliding chamber 9 and the second communicating chamber 15 , a middle communicating hole 18 is provided between the first piston chamber 10 and the high-pressure chamber 19 of the second piston chamber 14 , and a lower communicating hole 20 is provided between the first communicating chamber 11 and the second sliding chamber 13 .

[0036] Traditional valve cores all adopt solid structures, and make air path between the solid valve core and the valve body 1, and the path is small. In this technical solution, the first valve core 2 and the second valve core 3 both have a hollow part 4 connected at the upper and lower ends, and the two valve cores are set as hollow structures, and the hollow part 4 is the air path, and the first valve core 2 includes a first upper valve stem 2.1, a first piston part 2.2 and a first lower valve stem 2.3 arranged in sequence, and the second valve core 3 includes a second lower valve stem 3.1, a second piston part 3.2 and a second upper valve stem 3.3 arranged in sequence, and the piston part and the air path are integrated on the first valve core 2 and the second valve core 3. Compared with the existing solid valve core design with an air path around it, the hollow valve core of this technical solution has a larger path, a stronger conduction ability, and a simple internal air path, small resistance to gas, small medium resistance to valve core movement, and faster response. This design has smaller movement resistance and quicker response, and reduces the spring force used for seal reset, so that the force that the spring should bear is transferred to the valve core tube wall, so that the coil power, valve working pressure and flow rate are achieved at the same time. This technical solution integrates the piston, valve core, piston chamber and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and convenient processing. The solenoid valve of this technical solution adopts a simple and reliable structure, which makes it easy to install, simple to maintain, small in size, and can work for a long time. It can supply air to the first working port 6 and the second working port 7 respectively when the power is off and on.

[0037] Embodiment 2:

[0038] This embodiment is optimized based on the above-mentioned embodiment 1.

[0039] In order to provide a pilot structure that facilitates the driving of the valve core without increasing the power of the electromagnet, a pilot magnetic head mounting position 21, a pilot air intake path 22 and a pilot air outlet path 23 are provided on the valve body 1. The valve body 1 is connected to a pilot electromagnetic head (not shown in the figure) through the pilot magnetic head mounting position 21, and the two ends of the pilot air intake path 22 are respectively connected to the air inlet 5 and the pilot magnetic head mounting position 21, and the two ends of the pilot air outlet path 23 are respectively connected to the pilot magnetic head mounting position 21 and the first piston chamber 10.

[0040] Embodiment 3:

[0041] This embodiment is optimized based on the above-mentioned embodiment 1.

[0042] An upper sealing structure and a lower sealing structure are provided between the two ends of the first valve core 2 and the valve body 1, and between the two ends of the second valve core 3 and the valve body 1. When the high-pressure air inlet 5 is connected to the first working port 6 and the second working port 7, it can be self-sealed to enhance the sealing performance and prevent leakage.

[0043] Embodiment 4:

[0044] This embodiment is optimized based on the above-mentioned embodiment 3.

[0045] In order to achieve a higher sealing effect, the upper sealing structure and the lower sealing structure both include a sealing gasket groove 24 , in which a sealing gasket (not shown in the figure) is arranged.

[0046] Embodiment 5:

[0047] This embodiment is optimized based on the above-mentioned embodiment 4.

[0048] In order to increase the reliability of end face sealing, the upper sealing structure and the lower sealing structure both include an upper sealing ring 25 and a lower sealing ring 26 with a triangular cross-section. The upper sealing ring 25 and the lower sealing ring 26 are respectively arranged at the two ends of the first valve cavity and the second valve cavity, and the upper sealing ring 25 and the lower sealing ring 26 are respectively connected to the corresponding sealing gaskets (not shown in the figure).

[0049] Embodiment 6:

[0050] This embodiment is optimized based on the above-mentioned embodiment 2.

[0051] In order to facilitate the installation of the second valve core 3, the second spring 16 and the valve body 1, and to facilitate the molding of the pilot air inlet path 22 and the pilot air outlet path 23, an upper mounting groove 27 is provided at the upper end of the valve body 1, the second valve cavity is communicated with the upper mounting groove 27, a pilot upper cover 28 is installed in the upper mounting groove 27, and the second spring 16 is arranged between the pilot upper cover 28 and the second piston part 3.2;

[0052] The pilot air intake path 22 includes a first air intake path 22.1 and a second air intake path 22.2 which are interconnected. The pilot head mounting position 21 and the first air intake path 22.1 are both formed on the pilot upper cover 28. The first air intake path 22.1 is connected to the pilot head mounting position 21. The second air intake path 22.2 is formed on the valve body 1. The second air intake path 22.2 is connected to the air inlet 5.

[0053] Embodiment 7:

[0054] This embodiment is optimized based on the above-mentioned embodiment 6.

[0055] In order to improve the sealing performance between the pilot upper cover and the second valve chamber, the pilot air intake path 22 and the pilot exhaust air path 23, a first sealing ring groove 29, a second sealing ring groove 30 and a third sealing ring groove 35 are provided in the upper mounting groove 27. The first sealing ring groove 29 is coaxially arranged around the second air intake path 22.2, and a first sealing ring (not shown in the figure) is provided in the first sealing ring groove 29; the second sealing ring groove 30 is coaxially arranged around the pilot exhaust air path 23, and a second sealing ring (not shown in the figure) is provided in the second sealing ring groove 30; the third sealing ring groove 35 is coaxially arranged around the second valve chamber, and a third sealing ring (not shown in the figure) is provided in the third sealing ring groove 35.

[0056] Embodiment 8:

[0057] This embodiment is optimized based on the above-mentioned embodiment 1.

[0058] In order to facilitate the installation of the first valve core 2, the first spring 12 and the valve body 1, a lower installation groove 31 is provided at the lower end of the valve body 1, the lower end of the first valve cavity is connected to the lower installation groove 31, a lower cover 32 is installed in the lower installation groove 31, and the first spring 12 is arranged between the lower cover 32 and the first piston part 2.2.

[0059] Embodiment 9:

[0060] This embodiment is optimized based on the above-mentioned embodiment 1.

[0061] In order to improve the sliding sealing effect between the piston part and the piston cavity, the outer periphery of the first piston part 2.2 and the second piston part 3.2 is provided with a piston sealing ring groove 33, and a piston sealing ring (not shown in the figure) is arranged in the piston sealing ring groove 33.

[0062] Embodiment 10:

[0063] This embodiment is optimized based on the above-mentioned embodiment 1.

[0064] In order to improve the sliding sealing effect between the valve stem and the sliding cavity, the outer peripheries of the first upper valve stem 2.1 and the second lower valve stem 3.1 are both provided with valve stem grooves 34, and valve stem sealing rings (not shown in the figure) are arranged in the valve stem grooves 34.

[0065] Working principle: When the coil of the pilot electromagnetic head loses power, the moving iron core of the pilot electromagnetic head descends, the crater at the installation place of the pilot electromagnetic head is sealed, the pilot air inlet path 22 and the pilot air outlet path 23 are disconnected, the high pressure chamber 19 of the first piston chamber 10 is disconnected from the air inlet 5, and under the action of the first spring 12 and the second spring 16, the medium in the high pressure chamber 19 of the first piston chamber 10 and the second piston chamber 14 is discharged to the atmosphere through the vent hole of the pilot electromagnetic head, and the first valve core 2 and the second valve core 3 remain in the initial state, such as Figure 3 As shown, the air inlet 5 is connected to the first working port 6; when the coil of the pilot electromagnetic head is energized, the pilot electromagnetic head moving iron core is lifted, the pilot air inlet gas path 22 and the pilot exhaust gas path 23 are connected, and the medium reaches the high-pressure chamber 19 of the first piston chamber 10 through the air inlet 5, the pilot air inlet gas path 22 and the pilot exhaust gas path 23 in sequence. Since the first piston chamber 10 and the high-pressure chamber 19 of the second piston chamber 14 are connected through the middle connecting hole 18, the medium in the high-pressure chamber 19 will push the first valve core 2 and the second valve core 3 to move in opposite directions, respectively, as shown in FIG. Figure 8 As shown, the air inlet 5 is connected to the second working port 7 .

[0066] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-position four-way solenoid valve, characterized in that: It comprises a valve body, a first valve core and a second valve core, wherein the first valve core and the second valve core both have a hollow portion with upper and lower ends connected, and the valve body is provided with a first valve cavity, a second valve cavity, an air inlet, a first working port, a second working port and an exhaust port; The first valve cavity comprises a first sliding cavity, a first piston cavity and a first communicating cavity which are interconnected, the first sliding cavity is communicated with the air inlet, the first communicating cavity is communicated with the first working port, the first valve core comprises a first upper valve stem, a first piston part and a first lower valve stem which are arranged in sequence, the first upper valve stem is slidably matched with the first sliding cavity, the first piston part is slidably matched with the first piston cavity, the first lower valve stem is located in the first communicating cavity, a first spring is sleeved on the first lower valve stem, and the first spring is arranged between the first piston part and the lower end wall of the first communicating cavity; The second valve chamber comprises a second sliding chamber, a second piston chamber and a second communicating chamber which are interconnected, the second sliding chamber is communicated with the exhaust port, the second communicating chamber is communicated with the second working port, the second valve core comprises a second lower valve stem, a second piston portion and a second upper valve stem which are sequentially arranged, the second lower valve stem is slidably matched with the second sliding chamber, the second piston portion is slidably matched with the second piston chamber, the second upper valve stem is located in the second communicating chamber, a second spring is sleeved on the second upper valve stem, and the second spring is arranged between the second piston portion and the upper end wall of the second communicating chamber; An upper communicating hole is provided between the first sliding chamber and the second communicating chamber, a middle communicating hole is provided between the high-pressure chambers of the first piston chamber and the second piston chamber, and a lower communicating hole is provided between the first communicating chamber and the second sliding chamber.

2. A two-position four-way solenoid valve according to claim 1, characterized in that: The valve body is provided with a pilot magnetic head mounting position, a pilot air intake path and a pilot exhaust air path. The two ends of the pilot air intake path are respectively connected to the air inlet and the pilot magnetic head mounting position, and the two ends of the pilot exhaust air path are respectively connected to the pilot magnetic head mounting position and the first piston chamber.

3. A two-position four-way solenoid valve according to claim 1, characterized in that: An upper sealing structure and a lower sealing structure are provided between the two ends of the first valve core and the valve body, and between the two ends of the second valve core and the valve body.

4. A two-position four-way solenoid valve according to claim 3, characterized in that: The upper sealing structure and the lower sealing structure both include a sealing gasket groove, in which a sealing gasket is arranged.

5. A two-position four-way solenoid valve according to claim 4, characterized in that: The upper sealing structure and the lower sealing structure both include an upper sealing ring and a lower sealing ring with triangular cross-sections. The upper sealing ring and the lower sealing ring are respectively arranged at the two ends of the first valve cavity and the second valve cavity, and the upper sealing ring and the lower sealing ring are respectively connected to the corresponding sealing gaskets.

6. A two-position four-way solenoid valve according to claim 2, characterized in that: An upper mounting groove is provided at the upper end of the valve body, the second valve cavity is communicated with the upper mounting groove, a pilot upper cover is installed in the upper mounting groove, and the second spring is arranged between the pilot upper cover and the second piston part; The pilot air intake path includes a first air intake path and a second air intake path which are interconnected. The pilot head mounting position and the first air intake path are both formed on the pilot upper cover. The first air intake path is connected to the pilot head mounting position. The second air intake path is formed on the valve body. The second air intake path is connected to the air inlet.

7. A two-position four-way solenoid valve according to claim 6, characterized in that: A first sealing ring groove, a second sealing ring groove and a third sealing ring groove are provided in the upper mounting groove; the first sealing ring groove is coaxially arranged around the second air intake path, and a first sealing ring is provided in the first sealing ring groove; the second sealing ring groove is coaxially arranged around the pilot air intake path, and a second sealing ring is provided in the second sealing ring groove; the third sealing ring groove is coaxially arranged around the second valve cavity, and a third sealing ring is provided in the third sealing ring groove.

8. The two-position four-way solenoid valve according to claim 1, characterized in that: A lower mounting groove is provided at the lower end of the valve body, the lower end of the first valve cavity is communicated with the lower mounting groove, a lower cover is installed in the lower mounting groove, and the first spring is arranged between the lower cover and the first piston part.

9. The two-position four-way solenoid valve according to claim 1, characterized in that: The outer circumferences of the first piston part and the second piston part are provided with piston sealing ring grooves, and piston sealing rings are provided in the piston sealing ring grooves.

10. The two-position four-way solenoid valve according to claim 1, characterized in that: The outer circumferences of the first upper valve stem and the second lower valve stem are both provided with valve stem grooves, and valve stem sealing rings are provided in the valve stem grooves.

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