CN114623258B

CN114623258B - Reversing valve

Info

Publication number: CN114623258B
Application number: CN202011435056.1A
Authority: CN
Inventors: 汪泽波
Original assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Current assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2023-07-14
Anticipated expiration: 2040-12-10
Also published as: CN114623258A

Abstract

The invention provides a reversing valve. The reversing valve (100) comprises a reversing valve body (1) and two pilot cavity control units (2) which are connected with each other, wherein the two pilot cavity control units (2) are arranged on two sides or the same side of the reversing valve body (1) in the length direction of the reversing valve body (1), the reversing valve body (1) is respectively provided with a first end cover (13) and a second end cover (14) in the length direction, a valve cavity (101) is formed in the reversing valve body (1), a first valve core assembly (11) and a second valve core assembly (12) are arranged in the valve cavity (101), the first valve core assembly (11) and the second valve core assembly (12) are opposite to each other in the length direction, and the first valve core assembly (11) is provided with a first end part close to the first end cover (13) and a second end part deviating from the first end cover (13).

Description

Reversing valve

Technical Field

The invention relates to the field of reversing valves, in particular to a double two-position three-way valve structure with mechanical reset.

Background

The reset modes of the existing reversing valve are as follows:

1. a FESTO VUVG solenoid valve that returns to an initial state only when pressure is present in the pressure port area;

2. the springs of the valve are positioned on the end faces of the two valve cores. In this case, the spool needs to have a large size in order to place the spring. The stroke of the spring can increase the total length of the valve body, and when the valve is installed, the two valve cores and the spring are required to be pressed into the valve body, otherwise, the spring is easy to jump out;

3. one ram of the valve is placed between the two spools, the spring needs to be installed from the middle of the spools, and then other parts such as the ram, the insert, etc. are placed. When the two valve cores and the spring are installed, the valve cores and the spring need to be pressed into the valve body, otherwise, the ejector rod is easy to jump out. The size of the spool will therefore be relatively large. In addition, for small valves with compact structures, the diameter of the valve core is objectively smaller, so that the hole in the middle of the valve core is smaller, the diameter of a spring arranged in the hole is smaller, and the risk that the spring force is insufficient to push the valve core to reset exists.

CN203374939U discloses a mounting structure of a reset spring of a movable iron core of a solenoid valve of a loom, wherein a reset spring is pressed between the movable iron core and a sleeve, one end of the reset spring is sleeved in a spring seat on the movable iron core, the other end of the reset spring is sleeved in a spring hole of the sleeve, the spring hole is coaxial with the spring seat hole, the cross sections of the spring hole and the spring seat Kong Zong are trapezoidal, and the spring hole is opposite to the flaring end of the spring seat hole; the apex angle of the trapezoid of the section of the spring Kong Zong is 4 degrees; the spring hole has the same aperture at the flared end face opposite to the spring seat hole. When the movable iron core moves away from the track, the reset spring is not contacted with the inner wall of the spring hole, so that the reset spring is prevented from being damaged, the explosion state of the electromagnetic valve is avoided, the stability of the effective operation of the electromagnetic valve is improved, and the electromagnetic valve is suitable for the installation of the reset spring of the movable iron core of the electromagnetic valve.

Disclosure of Invention

The invention aims at providing a larger installation space for a spring under the condition of ensuring the compact valve core, so that a sufficient restoring force can be obtained by installing the larger spring. Furthermore, the invention aims at providing a spring and a push rod which cannot jump out and are easy to assemble.

In addition, the invention aims to solve or alleviate other technical problems in the prior art.

The present invention solves the above-mentioned problems by providing a reversing valve, in particular, according to an aspect of the present invention, there is provided:

a reversing valve includes a reversing valve body and two pilot chamber control units connected to each other, the two pilot chamber control units being arranged on both sides or on the same side of the reversing valve body in a length direction of the reversing valve body,

the reversing valve body is respectively provided with a first end cover and a second end cover in the length direction,

a valve cavity is arranged in the reversing valve body, a first valve core component and a second valve core component are arranged in the valve cavity, the first valve core component and the second valve core component are opposite to each other in the length direction, the first valve core component is provided with a first end part close to the first end cover and a second end part far away from the first end cover, the second valve core component is provided with a third end part far away from the second end cover and a fourth end part close to the second end cover,

the reversing valve body has a lip ring and a seal ring that function as a seal, the lip ring being respectively configured at an outer periphery of the first end portion of the first spool assembly and an outer periphery of the fourth end portion of the second spool assembly, the seal ring being respectively configured at an outer periphery of the second end portion of the first spool assembly and an outer periphery of the third end portion of the second spool assembly, and the seal ring being configured to be thicker than the lip ring in a radial direction,

a first pilot chamber and a second pilot chamber are respectively arranged outside the first end part of the first valve core assembly and outside the fourth end part of the second valve core assembly, the first pilot chamber and the second pilot chamber are respectively configured to enable the first valve core assembly and the second valve core assembly to be subjected to thrust forces acting in directions approaching to each other under the condition of leading gas,

wherein, the liquid crystal display device comprises a liquid crystal display device,

through holes are respectively formed in the first valve core component and the second valve core component, the length direction of the through holes is consistent with the length direction of the first valve core component and the second valve core component, the through holes are divided into a first valve core cavity and a second valve core cavity which are communicated with each other, the first valve core cavity is arranged closer to two sides of the reversing valve body than the second valve core cavity and is positioned at the lip-shaped ring, and the first valve core cavity has a larger radial dimension than the second valve core cavity,

the first valve core component and the second valve core component are respectively provided with a first plug and a second plug, the first plug and the second plug respectively seal the first end part of the first valve core component and the fourth end part of the second valve core component,

the first valve core component and the second valve core component are respectively provided with a first mechanical spring and a second mechanical spring, and are respectively provided with a first ejector rod and a second ejector rod, the length directions of the first mechanical spring and the second mechanical spring are consistent with the length directions of the first valve core component and the second valve core component, the first mechanical spring and the second mechanical spring are respectively arranged in the first valve core cavity, the first ejector rod and the second ejector rod are slidably and respectively arranged in the second valve core cavity at least partially, one end of the first ejector rod and one end of the second ejector rod are butted with each other, the other end of the second ejector rod extends to the first valve core cavity,

the first ejector rod and the second ejector rod are respectively provided with a first abutting part and a second abutting part, the first abutting part and the second abutting part have larger radial sizes than the second valve core cavity, the first mechanical spring is arranged between the first plug and the first abutting part, the second mechanical spring is arranged between the second plug and the second abutting part,

the first and second mechanical springs are configured to continuously apply thrust to the first and second plugs, respectively, such that the first and second spool assemblies can be pushed to an initial operating position, respectively, without pilot gas in the first and second pilot chambers.

Alternatively, according to one embodiment of the invention, the reversing valve is configured as a double two-position three-way valve.

Alternatively, according to an embodiment of the invention, the pilot chamber control unit is an electromagnetically or pneumatically controlled pilot chamber control unit.

Alternatively, according to an embodiment of the present invention, the first abutment portion and the second abutment portion abut against a transition of the first spool chamber and the second spool chamber, respectively, when the first spool assembly and the second spool assembly are in the initial operating position.

Alternatively, according to one embodiment of the present invention, the first end of the first spool assembly has a larger diameter than the second end of the first spool assembly, and the fourth end of the second spool assembly has a larger diameter than the third end of the second spool assembly.

Optionally, according to an embodiment of the present invention, the first ejector rod and the second ejector rod further have a first protrusion and a second protrusion, respectively, the first protrusion and the second protrusion form an end of the first ejector rod and the second ejector rod, respectively, at the first spool cavity, and the first mechanical spring and the second mechanical spring are sleeved on the first protrusion and the second protrusion, respectively.

The benefits of the provided reversing valve include: two sealing elements with small installation bottom diameters are arranged in the pressure port area, two lip-shaped rings with large installation bottom diameters are arranged in the pilot port area, and a spring is arranged in a large cavity, so that a larger space is conducive to designing a relatively large spring, and the purpose of achieving sufficient restoring force when the large spring is installed on a compact valve core is achieved; the plug is fixed on one side of the valve core, the spring and the ejector rod cannot jump out, and the assembly is easy.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

fig. 1 shows a schematic view of a reversing valve according to the invention in an initial operating position;

fig. 2 shows a schematic view of a reversing valve according to the invention in a final operating position;

fig. 3 shows a schematic view of a first spool chamber and a second spool chamber of a reversing valve according to the present invention.

Detailed Description

It is to be understood that, according to the technical solution of the present invention, those skilled in the art may propose various alternative structural modes and implementation modes without changing the true spirit of the present invention. Accordingly, the following detailed description and drawings are merely illustrative of the invention and are not intended to be exhaustive or to limit the invention to the precise form disclosed.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and distinguishing purposes only and are not to be construed as indicating or implying a relative importance of the corresponding components.

Referring to fig. 1 and 2, there are shown schematic diagrams of fig. 1 showing a reversing valve 100 according to the present invention in an initial operating position and a reversing valve 100 according to the present invention in an end operating position, respectively.

The direction valve 100 includes a direction valve body 1 and two pilot chamber control units 2 connected to each other, the two pilot chamber control units 2 being disposed at both sides or the same side of the direction valve body 1 in a length direction of the direction valve body 1,

the reversing valve body 1 has a first end cap 13 and a second end cap 14 in its length direction,

a valve cavity 101 is formed in the reversing valve body 1, a first valve core assembly 11 and a second valve core assembly 12 are arranged in the valve cavity 101, the first valve core assembly 11 and the second valve core assembly 12 are opposite to each other in the length direction, the first valve core assembly 11 is provided with a first end part close to the first end cover 13 and a second end part far away from the first end cover 13, the second valve core assembly 12 is provided with a third end part far away from the second end cover 14 and a fourth end part close to the second end cover 14,

the reversing valve body 1 has a lip ring 19 and a seal ring 20 that function as a seal, the lip ring 19 being respectively configured at the outer periphery of the first end portion of the first spool assembly 11 and the outer periphery of the fourth end portion of the second spool assembly 12, the seal ring 20 being respectively configured at the outer periphery of the second end portion of the first spool assembly 11 and the outer periphery of the third end portion of the second spool assembly 12, and the seal ring 20 being configured to be thicker than the lip ring 19 in the radial direction,

a first pilot chamber 114 and a second pilot chamber 115 are provided outside the first end portion of the first spool assembly 11 and outside the fourth end portion of the second spool assembly 12, respectively, the first pilot chamber 114 and the second pilot chamber 115 being configured to subject the first spool assembly 11 and the second spool assembly 12 to thrust forces acting in directions approaching each other with pilot gas being passed through,

through holes are respectively provided in the first valve core assembly 11 and the second valve core assembly 12, the length direction of the through holes coincides with the length direction of the first valve core assembly 11 and the second valve core assembly 12, the through holes are divided into a first valve core cavity 112 and a second valve core cavity 113 which are communicated with each other, the first valve core cavity 112 is arranged closer to both sides of the reversing valve body 1 than the second valve core cavity 113 and is located at the lip ring 19, and the first valve core cavity 112 has a larger radial dimension than the second valve core cavity 113,

the first valve core assembly 11 and the second valve core assembly 12 respectively have a first plug 111 and a second plug 121, the first plug 111 and the second plug 121 respectively close the first end of the first valve core assembly 11 and the fourth end of the second valve core assembly 12,

the first and

second spool assemblies

11 and 12 have first and second

mechanical springs

15 and 16, respectively, and further have first and

second lifters

17 and 18, respectively, the first and second

mechanical springs

15 and 16 having a length direction corresponding to the length direction of the first and

second spool assemblies

11 and 12, the first and second

mechanical springs

15 and 16 being disposed within the first spool chamber 112, respectively, the first and

second lifters

17 and 18 being slidably disposed at least partially within the second spool chamber 113, respectively, and abutting each other at one end, and extending to the first spool chamber 112 at the other end,

the first and

second ejector

17, 18 have a first and

second abutment

171, 181, respectively, the first and

second abutments

171, 181 having a larger radial dimension than the second spool chamber 113, the first mechanical spring 15 being arranged between the first plug 111 and the first abutment 171, the second mechanical spring 16 being arranged between the second plug 121 and the second abutment 181,

the first mechanical spring 15 and the second mechanical spring 16 are configured to continuously apply a pushing force to the first plug 111 and the second plug 121, respectively, such that the first spool assembly 11 and the second spool assembly 12 can be pushed to an initial working position, respectively, without pilot gas in the first pilot chamber and the second pilot chamber.

It should be understood that "the direction valve body 1 and the two pilot chamber control units 2 connected to each other" means that the two pilot chamber control units 2 are connected to the direction valve body 1 (or their corresponding pilot chambers), respectively, while the two pilot chamber control units 2 do not necessarily need to be connected to each other. Whether the two pilot chamber control units 2 are arranged on both sides or on the same side of the direction valve body 1 in the length direction of the direction valve body 1 can depend on the shape of the accommodation space in which the entire direction valve 100 is to be placed, or on the size, shape of the direction valve body 1 and the respective pilot chamber control units 2 themselves. It should be appreciated that although the first pilot chamber 114 and the second pilot chamber 115 of the reversing valve 100 are located at both sides of the reversing valve 100, it is not affected that the two pilot chamber control units 2 are located at the same side of the reversing valve 100, since the connection and communication of the pilot chamber control units 2 and the respective pilot chambers at different sides from each other can be achieved by a specific gas path arrangement.

In addition, the main component of the spool assembly includes a spool body and sealing members (such as the lip ring 19 and the seal ring 20) disposed on an outer peripheral surface (specifically, a non-groove portion of the outer peripheral surface) of the spool body for sealing with the corresponding valve chambers. A groove is configured at the outer circumference of the spool body, whereby a non-groove portion of the outer circumferential surface can be understood as a protrusion. The projection is configured to enable switching of the working port during movement of the spool body (e.g., in the event of movement to an initial working position or a final working position).

The sealing ring 20 is configured to be thicker than the lip ring 19 in the radial direction, because the lip ring 19 is often subjected to a single-sided pressure, i.e., the lip ring 19 is subjected to an opening pressure from the inside to the outside in the case of a corresponding pilot gas passage. While the sealing ring 20 is subjected to a bilateral pressure, i.e. the sealing ring 20 is subjected to a pressure in another direction than the above-mentioned opening pressure, which is brought about by the valve element assembly. The seal ring 20 is thus made thicker to withstand such bilateral pressures. In addition, the corresponding recess in the valve element assembly for receiving the sealing ring 20 can also be configured deeper to correspond to the thicker design of the sealing ring.

In this connection, the sealing ring 20 can be configured as an O-ring, i.e. a sealing element with a ring-shaped cross section, whereby the advantages of low price, simple manufacture, reliable function and easy installation can be achieved. For example, an O-ring disposed between the plug and the valve core is used to prevent cross-ventilation of the pressure port region and the pilot region.

In addition to the sealing rings 20, which are each formed at the outer periphery of the second end of the first valve element assembly 11 and at the outer periphery of the third end of the second valve element assembly 12, the sealing rings 20 can also be formed at the central projections of the respective valve element assemblies, since this region of the valve element assemblies is exposed to a certain air pressure in the respective operating position. While the lip ring 19 can also be configured at an outer periphery that is a distance inward from the outer periphery of the first end of the first spool assembly 11 and from the outer periphery of the fourth end of the second spool assembly 12. The valve core assembly can be provided with a plurality of lip rings and sealing rings which are configured at different peripheral positions so as to improve the overall sealing performance of the reversing valve.

The first plug 111 and the second plug 121 close the first end of the first valve core assembly 11 and the fourth end of the second valve core assembly 12, respectively, whereby the respective plugs are fixed at the respective valve core sides such that the respective springs and the jack cannot jump out and are easily assembled. For example, in the assembly process of the reversing valve 100, the corresponding spring may be first installed into the associated spool chamber from the middle of the reversing valve 100, and then other parts such as a push rod may be installed, thereby realizing a simple assembly process.

By employing a mechanical spring design, there is no risk of the valve failing to return to the original position due to the air supply not being supplied (e.g., the air supply system suddenly stopping or the pilot signal switching) relative to the air spring embodiment. In particular, safety applications are advantageous.

According to the main solution of the present application, the first mechanical spring 15 and the second mechanical spring 16 are each arranged within the first spool chamber 112, which means that the respective mechanical springs are located at the end region of the associated spool assembly, i.e. the region where the lip ring is located. Since the lip ring is configured to be thinner than the sealing ring, which means that the mounting base diameter of the lip ring is larger than the mounting base diameter of the sealing ring, the volume of the first spool chamber 112 is larger than the volume of the second spool chamber 113, so that such a region can be left for a larger accommodation space of the corresponding mechanical spring, thereby enabling a larger (in particular, a larger outer diameter) spring to be mounted for a larger restoring force.

The first plunger 17 and the second plunger 18 are each arranged slidably and at least partially in the second valve chamber 113 and are each abutted at one end and extend to the first valve chamber 112 at the other end, whereby the respective mechanical spring is continuously pushed by the end of the respective plunger relatively closer to both sides of the reversing valve 100, and thus the respective mechanical spring is continuously pushed by the associated plug, to ensure a continuous application of the restoring force.

The design of the first abutment 171 and the second abutment 181 provides mounting points for the respective mechanical springs and also can simultaneously perform a limiting function, i.e. limiting the movement range of the ejector pins within the spool chamber due to the different sizes of the first and second spool chambers, for example, preventing the risk of uneven restoring force caused by the deviation of the abutting positions of the two ejector pins from the middle of the reversing valve 100.

In addition to the technical effects mentioned previously, it can be seen by the above-described solution that by placing two (for the spring) small-diameter seals in the pressure port area and two (for the spring) large-diameter lip rings in the pilot port area, the spring is placed in a large cavity, whereby the larger space realized facilitates the design of a relatively larger spring, whereby a large spring is mounted in a compact spool to obtain a sufficient restoring force. The reversing valve with the mechanical spring reset function has the characteristics of compact structure and easiness in assembly.

It can also be seen from the figures that the reversing valve 100 is configured as a double two-position three-way valve. A double two-position three-way valve is a combination of two-position three-way valves, wherein the two-position three-way valve refers to a reversing valve (such as a solenoid valve) with two working positions and three air ports. The combination forms are not simply overlapped, but the reversing valve of the total five ports which share the air source port/air inlet.

For example, the five ports shown in the figures are from left to right an exhaust port, a working port, an intake port, a working port, and an exhaust port. When the reversing valve or the valve element assembly is in the initial operating position, no pilot chamber is provided in both pilot chambers, the two valve element assemblies are separated from each other, the air inlet is disconnected from the passage of the working opening, and the air outlet is connected to the passage of the working opening, so that the air of the working opening can be discharged through the air outlet. Under the condition that the pilot gas is introduced into the pilot cavity, the valve core assemblies move close to each other to a final working position, and at the moment, the air inlet is communicated with the two working ports, so that certain application is realized. It will be appreciated that this principle of operation can be reversed and that the skilled person can modify the grooves and protrusions of the valve cartridge assembly according to the actual application requirements.

The pilot chamber control unit 2 can be an electromagnetically or pneumatically controlled pilot chamber control unit 2. The reversing valve body 1 can also be constructed in an adaptive manner. For example, in the case where the pilot chamber control unit 2 is configured as an electromagnetically controlled pilot chamber control unit (i.e., the reversing valve 100 is configured as a solenoid valve), it has a nozzle, an electric drive assembly, a coil, and the like. The state in which the reversing valve 100 is de-energized corresponds to the case in which the corresponding pilot chamber is not supplied with pilot gas, and vice versa.

Still alternatively, the first end of the first spool assembly 11 has a larger diameter than the second end of the first spool assembly 11, and the fourth end of the second spool assembly 12 has a larger diameter than the third end of the second spool assembly 12. Thereby, a larger installation space can be further provided for the respective mechanical springs in order to obtain a larger spring return force while ensuring that the valve core assembly is still compact.

The first ejector rod 17 and the second ejector rod 18 are further provided with a first protruding portion 172 and a second protruding portion 182, the first protruding portion 172 and the second protruding portion 182 form a first ejector rod 17 and a second ejector rod 18 respectively located at an end portion of the first spool cavity 112, and the first mechanical spring 15 and the second mechanical spring 16 are respectively sleeved on the first protruding portion 172 and the second protruding portion 182.

By the design of the first projection 172 and the second projection 182, together with the aforementioned abutment, a stable mounting point is provided for the associated mechanical spring and a better form fit with the respective end of the respective spring is achieved, which also improves the spring life. It should be appreciated that the length of the two protrusions is configured such that when the reversing valve 100 is in the final operating position, the two protrusions remain a distance from the respective plugs to avoid accidental collisions.

Referring to fig. 3, a schematic diagram of a first spool chamber 112 and a second spool chamber 113 of a reversing valve 100 according to the present invention is shown.

When the first valve element assembly 11 and the second valve element assembly 12 are in the initial operating positions, the first abutting portion 171 and the second abutting portion 181 abut against the transition portion of the first valve element chamber 112 and the second valve element chamber 113, respectively. That is, at this time, the first abutting portion 171 and the second abutting portion 181 abut against surfaces formed by the difference in radial dimensions of the two spool chambers, respectively, which surfaces play a role in restricting the displacement of the jack, and are therefore also referred to as stopper surfaces. By the design of the stop surface, the maximum stroke of the ejector rod due to the thrust of the spring is limited, and the maximum extension distance of the end part of the ejector rod close to the middle of the reversing valve 100 is limited, so that the corresponding end parts of the two ejector rods can collide with each other in the middle of the reversing valve 100, and the respective return forces are kept balanced with each other.

It should be understood that all of the above preferred embodiments are exemplary and not limiting, and that various modifications or variations of the above-described specific embodiments, which are within the spirit of the invention, should be made by those skilled in the art within the legal scope of the invention.

Claims

1. A direction valve (100), the direction valve (100) comprising a direction valve body (1) and two pilot chamber control units (2) connected to each other, the two pilot chamber control units (2) being arranged on both sides or on the same side of the direction valve body (1) in a length direction of the direction valve body (1),

the reversing valve body (1) is provided with a first end cover (13) and a second end cover (14) respectively along the length direction,

a valve cavity (101) is formed in the reversing valve body (1), a first valve core component (11) and a second valve core component (12) are arranged in the valve cavity (101), the first valve core component (11) and the second valve core component (12) are opposite to each other in the length direction, the first valve core component (11) is provided with a first end part close to the first end cover (13) and a second end part far away from the first end cover (13), the second valve core component (12) is provided with a third end part far away from the second end cover (14) and a fourth end part close to the second end cover (14),

the reversing valve body (1) has a lip ring (19) and a seal ring (20) that function as a seal, the lip ring (19) is respectively configured at an outer periphery of the first end portion of the first spool assembly (11) and an outer periphery of the fourth end portion of the second spool assembly (12), the seal ring (20) is respectively configured at an outer periphery of the second end portion of the first spool assembly (11) and an outer periphery of the third end portion of the second spool assembly (12), and the seal ring (20) is configured to be thicker than the lip ring (19) in a radial direction,

a first pilot chamber (114) and a second pilot chamber (115) are respectively arranged outside the first end part of the first valve core assembly (11) and outside the fourth end part of the second valve core assembly (12), the first pilot chamber (114) and the second pilot chamber (115) are configured to respectively cause the first valve core assembly (11) and the second valve core assembly (12) to receive thrust force acting in a direction approaching each other under the condition of leading gas,

it is characterized in that the method comprises the steps of,

through holes are respectively formed in the first valve core component (11) and the second valve core component (12), the length direction of the through holes is consistent with the length direction of the first valve core component (11) and the second valve core component (12), the through holes are divided into a first valve core cavity (112) and a second valve core cavity (113) which are communicated with each other, the first valve core cavity (112) is arranged closer to two sides of the reversing valve body (1) relative to the second valve core cavity (113) and is positioned at the lip-shaped ring (19), and the first valve core cavity (112) has a larger radial dimension than the second valve core cavity (113),

the first valve core component (11) and the second valve core component (12) are respectively provided with a first plug (111) and a second plug (121), the first plug (111) and the second plug (121) respectively seal the first end part of the first valve core component (11) and the fourth end part of the second valve core component (12),

the first valve core assembly (11) and the second valve core assembly (12) are respectively provided with a first mechanical spring (15) and a second mechanical spring (16), and are respectively provided with a first ejector rod (17) and a second ejector rod (18), the length directions of the first mechanical spring (15) and the second mechanical spring (16) are consistent with the length directions of the first valve core assembly (11) and the second valve core assembly (12), the first mechanical spring (15) and the second mechanical spring (16) are respectively arranged in the first valve core cavity (112), the first ejector rod (17) and the second ejector rod (18) are slidably and respectively arranged in the second valve core cavity (113) at least partially, one ends of the first mechanical spring (15) and the second mechanical spring (16) are butted with each other, the other ends of the first mechanical spring (15) and the second mechanical spring (16) extend to the first valve core cavity (112),

the first ejector (17) and the second ejector (18) each have a first abutment (171) and a second abutment (181), the first abutment (171) and the second abutment (181) having a larger radial dimension than the second spool chamber (113), the first mechanical spring (15) being arranged between the first plug (111) and the first abutment (171), the second mechanical spring (16) being arranged between the second plug (121) and the second abutment (181),

the first mechanical spring (15) and the second mechanical spring (16) are configured to continuously exert a pushing force on the first plug (111) and the second plug (121), respectively, such that the first valve element assembly (11) and the second valve element assembly (12) can be pushed to an initial working position, respectively, without a pilot gas in the first pilot chamber and the second pilot chamber.

2. The reversing valve (100) of claim 1, wherein the reversing valve (100) is configured as a double two-position three-way valve.

3. The reversing valve (100) according to claim 1, wherein the pilot chamber control unit (2) is an electromagnetically or pneumatically controlled pilot chamber control unit (2).

4. The reversing valve (100) of claim 1, wherein the first abutment (171) and the second abutment (181) abut at a transition of the first spool chamber (112) and the second spool chamber (113), respectively, when the first spool assembly (11) and the second spool assembly (12) are in the initial operating position.

5. The reversing valve (100) of claim 1, wherein a first end of the first spool assembly (11) has a larger diameter than a second end of the first spool assembly (11), and a fourth end of the second spool assembly (12) has a larger diameter than a third end of the second spool assembly (12).

6. The reversing valve (100) of claim 1, wherein the first ejector rod (17) and the second ejector rod (18) further have a first protrusion (172) and a second protrusion (182), respectively, the first protrusion (172) and the second protrusion (182) form an end of the first spool chamber (112) respectively, the first mechanical spring (15) and the second mechanical spring (16) are sleeved on the first protrusion (172) and the second protrusion (182), respectively.