Valve body assembly and valve device

Abstract

The utility model relates to the technical field of mechanical engineering, and provides a valve body assembly and a valve device. The valve body assembly comprises a piston movably arranged on the guide shaft in a sleeving mode, the piston is provided with a stepped hole, the guide shaft is provided with a stepped section, and the stepped hole is matched with the stepped section to limit at least one containing space. The valve body assembly further comprises first sealing pieces and second sealing pieces, at least one first sealing piece and at least one second sealing piece are arranged in at least one containing space, the high-temperature-resistant upper limit of the first sealing pieces is higher than the high-temperature-resistant upper limit of the second sealing pieces, and the low-temperature-resistant lower limit of the second sealing pieces is lower than the low-temperature-resistant lower limit of the first sealing pieces. According to the valve body assembly, the requirements of different working conditions such as the high-temperature working condition and the low-temperature working condition can be met, it is ensured that the sealing performance of the sealing piece is kept under the requirements of various working conditions applied to the valve body assembly, the dynamic sealing performance of the piston is ensured, the working range of the valve body assembly is expanded, and then the reliability and safety of the valve body assembly are ensured.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and more specifically, to valve body components and valve devices. Background Technology

[0002] Valves are commonly used components in mechanical engineering. The piston is the core moving part of a valve. A sealing fit is achieved between the piston and static components such as the valve body, and the dynamic sealing performance of the piston determines the reliability of the valve. For example, a relay valve used in vehicles has a built-in control chamber and a working chamber, which are isolated by a piston. The piston needs a sealing fit with the static components through a sealing element to effectively isolate the control chamber and the working chamber, ensuring the reliability of the relay valve.

[0003] Currently, a common problem with seals used in valves is that the operating conditions required by valves typically include high-temperature and low-temperature conditions, but the temperature range of the seals cannot meet these requirements. In particular, high-temperature / low-temperature conditions can easily exceed the temperature range of the seals, causing the seals to lose their sealing function, resulting in media leakage and affecting the reliability of the valves.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a valve body assembly and a valve device to solve the problem that the temperature resistance range of the seals in current valve components cannot meet the requirements of the working conditions, thus affecting the reliability of the valve components.

[0006] According to one aspect of the present invention, a valve body assembly is provided, including a piston movably fitted on a guide shaft. The piston is provided with a stepped hole, and the guide shaft is provided with a stepped section. The stepped hole and the stepped section cooperate to limit at least one receiving space. The valve body assembly further includes a first seal and a second seal. At least one first seal and at least one second seal are disposed in the at least one receiving space. The upper limit of the high temperature resistance of the first seal is higher than the upper limit of the high temperature resistance of the second seal, and the lower limit of the low temperature resistance of the second seal is lower than the lower limit of the low temperature resistance of the first seal.

[0007] In some embodiments, each of the receiving spaces is limited by a first-stage step wall of the stepped segment and a first-stage step hole of the stepped hole; the receiving space of the first seal and the receiving space of the second seal are the same receiving space, or the receiving space of the first seal and the receiving space of the second seal are adjacent and / or separated.

[0008] In some embodiments, the at least one accommodating space includes two axially adjacent accommodating spaces; a first seal is disposed in one of the two axially adjacent accommodating spaces and a second seal is disposed in the other of the two axially adjacent accommodating spaces.

[0009] In some embodiments, the stepped segment sequentially includes a first stepped wall, a second stepped wall, and a third stepped wall with progressively decreasing diameters, and the stepped hole sequentially includes a first stepped hole, a second stepped hole, and a third stepped hole with progressively decreasing diameters. The first stepped wall mates with the first stepped hole, the second stepped wall mates with the second stepped hole, and the third stepped wall mates with the third stepped hole, thereby defining two axially adjacent receiving spaces between the first stepped hole and the second stepped wall, and between the second stepped hole and the third stepped wall.

[0010] In some embodiments, an axial stop fit is formed between one end face of the stepped hole and one end face of the stepped segment.

[0011] In some embodiments, the piston is movably housed in a housing; at least one receiving space is formed between the outer peripheral surface of the piston and the housing, and at least one additional first seal and at least one additional second seal are disposed in the at least one receiving space.

[0012] In some embodiments, the outer peripheral surface of the piston is provided with two receiving grooves, one of the two receiving grooves is provided with another first seal and the other of the two receiving grooves is provided with another second seal.

[0013] In some embodiments, the housing has the guide shaft extending along a central axis, and the piston has a central hub in which the stepped bore is formed.

[0014] In some embodiments, the first seal is press-fitted into the corresponding space at least within its temperature range, the second seal is press-fitted into the corresponding space at least within its temperature range, and the temperature range of the first seal partially overlaps with the temperature range of the second seal.

[0015] In some embodiments, the upper limit of the high temperature resistance of the first seal is greater than or equal to 120°C, and / or the lower limit of the low temperature resistance of the second seal is less than or equal to -40°C.

[0016] In some embodiments, the material of the first seal is hydrogenated nitrile rubber, and / or the material of the second seal is nitrile rubber.

[0017] According to another aspect of the present invention, a valve device is provided, the valve device being configured with the valve body assembly described in any of the above embodiments.

[0018] In some embodiments, the valve device is a relay valve.

[0019] In some embodiments, the valve device is a relay valve in the pneumatic braking system of a vehicle.

[0020] The beneficial effects of this utility model compared with the prior art include at least the following:

[0021] The upper limit of the high temperature resistance of the first seal is higher than that of the second seal, ensuring stable sealing performance under the high-temperature conditions required for the valve body assembly. Conversely, the lower limit of the low temperature resistance of the second seal is lower than that of the first seal, ensuring stable sealing performance under the low-temperature conditions required for the valve body assembly. Thus, the valve body assembly of this invention can accommodate different operating conditions, including high and low temperatures, ensuring the seals maintain their sealing performance under various conditions, guaranteeing the dynamic sealing performance of the piston, expanding the operating range of the valve body assembly, and ultimately ensuring its reliability and safety.

[0022] Furthermore, the piston, through the stepped hole and the stepped section of the guide shaft, fits together and limits at least one receiving space, which can achieve the following: on the one hand, it facilitates the manufacturing and demolding of the piston and guide shaft, without the need to open a slot for setting the seal; on the other hand, with the stepped hole and the guide shaft limiting multiple receiving spaces for setting the first seal and the second seal respectively, the correct installation of the first seal and the second seal can be ensured by the receiving spaces of different sizes.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 A schematic diagram of the valve body assembly in an embodiment of this utility model is shown. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0027] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.

[0028] The use of terms such as "first," "second," and similar words in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. Terms such as "axial," "radial," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The term "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.

[0030] Figure 1 The structure of the valve body assembly is illustrated, with reference to... Figure 1 As shown, the valve body assembly provided in this embodiment of the present invention includes:

[0031] A piston 200 is movably fitted on a guide shaft 110. The piston 200 is provided with a stepped hole 220. The guide shaft 110 is provided with a stepped section 112. The stepped hole 220 and the stepped section 112 cooperate to limit at least one receiving space (300a, 300b).

[0032] At least one first seal 400 and at least one second seal 500 are disposed in at least one receiving space (300a, 300b), wherein the upper limit of the high temperature resistance of the first seal 400 is higher than the upper limit of the high temperature resistance of the second seal 500, and the lower limit of the low temperature resistance of the second seal 500 is lower than the lower limit of the low temperature resistance of the first seal 400.

[0033] The valve body assembly provided in this embodiment of the present invention can be applied to vehicles, such as relay valves used in vehicles, and can also be applied to other engineering scenarios such as mechanical manufacturing and power engineering.

[0034] The stepped hole 220 refers to a hole structure formed by multiple geometric steps or diameter changes. The stepped section 112 refers to a shaft structure formed by multiple geometric steps or diameter changes. The axial Z-axis fit (i.e., the direction of movement of the piston 200) between the stepped hole 220 and the stepped section 112 guides the movement of the piston 200; the radial (perpendicular to the axial Z-axis) fit between the stepped hole 220 and the stepped section 112 defines at least one accommodating space (300a, 300b). The specific fit relationship between the stepped hole 220 and the stepped section 112 can be set as needed. For example, it can be set to a zero-clearance fit to achieve precision guidance, or a clearance fit to allow thermal expansion displacement, etc., as long as it ensures a stable fit between the piston 200 and the guide shaft 110, thereby ensuring the normal movement of the piston 200 and its dynamic sealing performance.

[0035] The piston 200 engages with the stepped section 112 of the guide shaft 110 via the stepped hole 220, which also meets the requirements of convenient manufacturing and guiding the assembly of the seal. Specifically, on the one hand, the engagement of the stepped hole 220 with the stepped section 112 defines at least one receiving space (300a, 300b), which facilitates the manufacturing and demolding of the piston 200 and the guide shaft 110 without the need to open additional slots for the seal; on the other hand, with the stepped hole 220 and the guide shaft 110 defining multiple receiving spaces for the installation of the first seal 400 and the second seal 500, the correct installation of the first seal 400 and the second seal 500 can be ensured by the receiving spaces of different sizes.

[0036] The stepped hole 220 and the stepped section 112 each include at least one step to define at least one receiving space (300a, 300b) through mating. In a preferred embodiment, the stepped hole 220 and the stepped section 112 each include multiple steps to define multiple receiving spaces through mating, and the first seal 400 and the second seal 500 are respectively provided thereon.

[0037] The first seal 400 and the second seal 500 can be disposed together in one receiving space, or they can be disposed separately in different receiving spaces. In a preferred embodiment, the first seal 400 and the second seal 500 are disposed separately in different receiving spaces to avoid mutual interference and ensure that at least one seal performs a sealing function under both high-temperature and low-temperature operating conditions.

[0038] The first seal 400 and the second seal 500 each have a certain temperature resistance range, and both can maintain stable sealing performance within their respective temperature ranges. The first seal 400 can be referred to as a high-temperature seal, and its upper temperature resistance limit is higher than that of the second seal 500, ensuring that at least the first seal 400 can stably maintain its sealing performance under the high-temperature conditions required for the valve body assembly; simultaneously, the second seal 500 will not undergo irreversible deformation under high-temperature conditions. The second seal 500 can be referred to as a low-temperature seal, and its lower temperature resistance limit is lower than that of the first seal 400, ensuring that at least the second seal 500 can stably maintain its sealing performance under the low-temperature conditions required for the valve body assembly; simultaneously, the first seal 400 will not undergo irreversible deformation under low-temperature conditions. Thus, the valve body assembly of this utility model can take into account different operating conditions such as high temperature and low temperature, ensure that the seals maintain their sealing performance under various operating conditions, ensure the dynamic sealing performance of the piston 200, expand the working range of the valve body assembly, and thus ensure the reliability and safety of the valve body assembly.

[0039] It should be noted that high temperature and low temperature in this invention are relative concepts and can vary depending on the engineering scenario in which the valve body assembly is applied. For example, when the valve body assembly is applied to a vehicle, high temperature conditions typically refer to conditions between 50°C and 120°C (this condition corresponds, for example, to the environment of prolonged high-temperature operation in the vehicle's engine compartment), and low temperature conditions typically refer to conditions between -40°C and -30°C (this condition corresponds, for example, to the vehicle's cold start environment). When the valve body assembly is applied to a vehicle, the upper limit of the high temperature resistance of the first seal 400 can be set to greater than or equal to 120°C to ensure that at least the first seal 400 stably performs its sealing function under high temperature conditions; the lower limit of the low temperature resistance of the second seal 500 can be set to less than or equal to -40°C to ensure that at least the second seal 500 stably performs its sealing function under low temperature conditions. When the valve body assembly is applied to other engineering scenarios, the specific temperature conditions of high temperature and low temperature conditions will change, and the upper limit of the high temperature resistance of the first seal 400 and the lower limit of the low temperature resistance of the second seal 500 need to be adjusted accordingly.

[0040] The upper limit of high temperature resistance of the first seal 400 and the lower limit of low temperature resistance of the second seal 500 can be adjusted by selecting the materials. For example, when the valve body assembly is used in a vehicle, hydrogenated nitrile rubber can be selected as the material to ensure that the upper limit of high temperature resistance of the first seal 400 meets the requirements of high-temperature conditions; and nitrile rubber can be selected as the material to ensure that the lower limit of low temperature resistance of the second seal 500 meets the requirements of low-temperature conditions. When the valve body assembly is used in other engineering scenarios, the materials of the first seal 400 and the second seal 500 can be adjusted as needed, and suitable materials such as methyl vinyl silicone rubber and fluorosilicone rubber can also be selected.

[0041] In some embodiments, each receiving space is limited by a first-stage stepped wall of the guide shaft 110 and a first-stage stepped hole of the piston 200; the receiving space for the first seal 400 and the receiving space for the second seal 500 are the same receiving space, or the receiving space for the first seal 400 and the receiving space for the second seal 500 are adjacent and / or separated.

[0042] The arrangement of the seals within the receiving space can be flexibly adjusted according to different usage requirements. For example, the receiving space for the first seal 400 and the receiving space for the second seal 500 may be separated by one or more receiving spaces. These receiving spaces can house suitable seals or serve other purposes according to the design requirements of the valve body assembly. Alternatively, the receiving spaces for the first seal 400 and the second seal 500 may be both adjacent and separated, such as multiple receiving spaces for the first seal 400 and / or multiple receiving spaces for the second seal 500, where some receiving spaces for the first seal 400 are adjacent to some receiving spaces for the second seal 500, while others are separated from each other.

[0043] In one specific implementation, at least one receiving space (300a, 300b) comprises two axially adjacent receiving spaces. A first seal 400 is disposed in one of the two axially adjacent receiving spaces, and a second seal 500 is disposed in the other of the two axially adjacent receiving spaces. For example, at least one receiving space (300a, 300b) comprises a first receiving space 300a and a second receiving space 300b that are axially adjacent. A first seal 400 is disposed in the first receiving space 300a, and a second seal 500 is disposed in the second receiving space 300b. In this embodiment, the stepped hole 220 of the piston 200 and the stepped section 112 of the guide shaft 110 each include at least two steps, so that the stepped hole 220 and the stepped section 112 cooperate to limit two receiving spaces, respectively accommodating the high-temperature resistant first seal 400 and the low-temperature resistant second seal 500, thereby achieving dynamic sealing between the piston 200 and the guide shaft 110 under various operating conditions such as high-temperature conditions and low-temperature conditions.

[0044] The positions of the first seal 400 and the second seal 500 can be set as needed. For example, if the area near a seal is more susceptible to high-temperature conditions, then that seal is set as the first seal 400; similarly, if the area near a seal is more susceptible to low-temperature conditions, then that seal is set as the second seal 500. Furthermore, considering that the first seal 400 needs to maintain stable sealing performance under high-temperature conditions, to prevent it from expanding excessively under high-temperature conditions and affecting the seal between the piston 200 and the guide shaft 110, the radial dimension of the first seal 400 is designed to be smaller, while the radial dimension of the second seal 500 is designed to be larger.

[0045] In one specific implementation, the stepped segment 112 sequentially includes a first stepped wall 112a, a second stepped wall 112b, and a third stepped wall 112c with progressively decreasing diameters, wherein the diameter difference between adjacent stepped walls may be equal or unequal; and the stepped hole 220 sequentially includes a first stepped hole 220a, a second stepped hole 220b, and a third stepped hole 220c with progressively decreasing diameters, wherein the diameter difference between adjacent stepped holes may be equal or unequal. The stepped walls of the stepped segment 112 mainly refer to the axial walls extending along the Z-axis, and the stepped holes of the stepped hole 220 mainly refer to the hole walls extending along the Z-axis. The first stepped wall 112a mates with the first stepped hole 220a, the second stepped wall 112b mates with the second stepped hole 220b, and the third stepped wall 112c mates with the third stepped hole 220c, forming a multi-stage guide for the axial movement of the piston 200. Furthermore, two axially adjacent receiving spaces are defined between the first step hole 220a and the second step wall 112b, and between the second step hole 220b and the third step wall 112c, namely the first receiving space 300a and the second receiving space 300b.

[0046] In some embodiments, an axial stop fit is formed between one end face 220' of the stepped hole 220 and one end face 112' of the stepped section 112, which limits the stroke of the piston 200 and prevents the seals provided in at least one receiving space (300a, 300b) from being damaged by excessive pressure.

[0047] In some embodiments, the piston 200 is movably housed within the housing 100; at least one receiving space 260 is formed between the outer peripheral surface of the piston 200 and the housing 100, and at least one additional first seal 400 and at least one additional second seal 500 are disposed in the at least one receiving space 260. This allows the piston 200 and the housing 100 to maintain a dynamic sealing fit under various operating conditions, such as high temperature and low temperature, ensuring the dynamic sealing performance of the piston, thereby expanding the operating range of the valve body assembly and ensuring the reliability and safety of the valve body assembly. The provision of the additional first seal 400 means that in addition to the first seal 400 being disposed in at least one receiving space (300a, 300b), a first seal 400 is also disposed in at least one receiving space 260; the provision of the additional second seal 500 means that in addition to the second seal 500 being disposed in at least one receiving space (300a, 300b), a second seal 500 is also disposed in at least one receiving space 260.

[0048] The arrangement of the first seal 400 and the second seal 500 within at least one accommodating space 260, as described above, can be flexibly adjusted according to different design requirements. For example, the accommodating space for the first seal 400 and the accommodating space for the second seal 500 can be the same accommodating space, or the accommodating spaces for the first seal 400 and the second seal 500 can be adjacent and / or separated, as long as it is ensured that under high-temperature operating conditions where the valve body assembly is applied, at least the first seal 400 effectively performs its sealing function while the second seal 500 does not undergo irreversible deformation, and that under low-temperature operating conditions where the valve body assembly is applied, at least the second seal 500 effectively performs its sealing function while the first seal 400 does not undergo irreversible deformation.

[0049] The guide shaft 110 can be fixedly connected to the housing 100, and the guide shaft 110 and the housing 100 can also be integrally formed. In one specific implementation, the housing 100 has a guide shaft 110 extending on the central axis, and the piston 200 has a central hub in which a stepped hole 220 is formed.

[0050] In some embodiments, the first seal 400 is press-fitted into the corresponding space (accommodating space 260 / accommodating space (300a, 300b)) at least within its temperature resistance range, and the second seal 500 is press-fitted into the corresponding space (accommodating space 260 / accommodating space (300a, 300b)) at least within its temperature resistance range, with the temperature resistance ranges of the first seal 400 and the second seal 500 partially overlapping. This ensures that the first seal 400 / second seal 500 can continuously and stably perform their sealing function under various operating conditions in which the valve body assembly is applied.

[0051] In some embodiments, the accommodating space 260 and / or the containing space (300a, 300b) is an annular space, but is not limited thereto; the accommodating space 260 and / or the containing space (300a, 300b) may also be one or more arc-shaped spaces.

[0052] In some embodiments, the corners of the accommodating space 260 and / or the receiving spaces (300a, 300b) are rounded. This rounded transition guides the assembly of the corresponding seals and reduces stress concentration.

[0053] In some embodiments, the outer peripheral surface of the piston 200 is provided with two receiving grooves, one of which contains a first sealing element 400 and the other contains a second sealing element 500. Specifically, two receiving grooves can be formed on the outer peripheral surface of the piston 200, and a high-temperature resistant first sealing element 400 and a low-temperature resistant second sealing element 500 can be respectively provided to achieve a dynamic sealing fit between the piston 200 and the housing 100. The positions of the first sealing element 400 and the second sealing element 500 can be set as needed, for example, according to the working conditions of the area near the sealing element, but are not limited thereto.

[0054] This utility model embodiment also provides a valve device, which is equipped with the valve body assembly described in any of the above embodiments. It enables dynamic sealing between the piston 200, the housing 100, and the guide shaft 110 through a high-temperature resistant first seal 400 and a low-temperature resistant second seal 500. This allows the valve device to meet the needs of different operating conditions, such as high-temperature and low-temperature conditions, expanding its application temperature range and ensuring its reliability and safety. The valve device provided by this utility model can be applied to various engineering scenarios such as vehicles, machinery manufacturing, and power engineering.

[0055] In some embodiments, the valve device is a relay valve, such as a relay valve in a vehicle's pneumatic braking system, but not limited thereto; relay valves can also be applied to fields such as industrial automation and rail transportation.

[0056] In a vehicle's pneumatic braking system, the relay valve is a core component, mainly used to shorten the inflation and deflation time of the brake chamber and improve braking response speed. Figure 1 The valve body assembly shown is the valve body assembly of the relay valve used in the pneumatic braking system of a vehicle. The piston 200 is used to block the control air chamber 100a and the working air chamber 100b. The piston 200, housing 100 and guide shaft 110 are dynamically sealed by a high-temperature resistant first seal 400 and a low-temperature resistant second seal 500. This allows the relay valve to meet the requirements of different operating conditions such as high temperature and low temperature, expand the application temperature range of the relay valve, and ensure the reliability and safety of the relay valve.

[0057] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A valve body assembly comprising a piston movably fitted onto a guide shaft, characterized in that: The piston is provided with a stepped hole, and the guide shaft is provided with a stepped section. The stepped hole and the stepped section cooperate to limit at least one accommodating space. The valve body assembly further includes a first seal and a second seal. At least one first seal and at least one second seal are disposed in the at least one accommodating space. The upper limit of the high temperature resistance of the first seal is higher than the upper limit of the high temperature resistance of the second seal, and the lower limit of the low temperature resistance of the second seal is lower than the lower limit of the low temperature resistance of the first seal.

2. The valve body assembly as claimed in claim 1, characterized in that, Each of the aforementioned accommodating spaces is formed by the first-level step wall of the stepped segment and the first-level step hole of the stepped hole; The accommodating space of the first seal and the accommodating space of the second seal are set to be the same accommodating space, or the accommodating space of the first seal and the accommodating space of the second seal are set to be adjacent and / or separated.

3. The valve body assembly as claimed in claim 2, characterized in that, The at least one accommodating space includes two axially adjacent accommodating spaces; A first seal is provided in one of the two axially adjacent receiving spaces, and a second seal is provided in the other of the two axially adjacent receiving spaces.

4. The valve body assembly as claimed in claim 3, characterized in that, The stepped section sequentially includes a first stepped wall, a second stepped wall, and a third stepped wall with progressively decreasing diameters, and the stepped hole sequentially includes a first stepped hole, a second stepped hole, and a third stepped hole with progressively decreasing diameters. The first stepped wall mates with the first stepped hole, the second stepped wall mates with the second stepped hole, and the third stepped wall mates with the third stepped hole, thus defining two axially adjacent receiving spaces between the first stepped hole and the second stepped wall, and between the second stepped hole and the third stepped wall.

5. The valve body assembly as claimed in claim 1, characterized in that, An axial stop fit is formed between one end face of the stepped hole and one end face of the stepped segment.

6. The valve body assembly as claimed in claim 1, characterized in that, The piston is movably housed within the housing; At least one accommodating space is formed between the outer peripheral surface of the piston and the housing, and at least one additional first seal and at least one additional second seal are disposed in the at least one accommodating space.

7. The valve body assembly as claimed in claim 6, characterized in that, The piston has two receiving grooves on its outer peripheral surface, one of which is provided with a first seal and the other of which is provided with a second seal.

8. The valve body assembly as claimed in claim 6, characterized in that, The housing has the guide shaft extending along the central axis, and the piston has a central hub in which the stepped bore is formed.

9. The valve body assembly as claimed in any one of claims 1 to 8, characterized in that, The first seal is press-fitted into the corresponding space at least within its temperature range, and the second seal is press-fitted into the corresponding space at least within its temperature range, with the temperature ranges of the first seal and the second seal partially overlapping.

10. The valve body assembly as claimed in any one of claims 1 to 8, characterized in that, The first seal has a high temperature resistance limit of 120°C or higher, and / or the second seal has a low temperature resistance limit of -40°C or lower.

11. The valve body assembly as claimed in any one of claims 1 to 8, characterized in that, The material of the first seal is hydrogenated nitrile rubber, and / or the material of the second seal is nitrile rubber.

12. A valve device, characterized in that, The valve device is configured with a valve body assembly as described in any one of claims 1-11.

13. The valve device as claimed in claim 12, characterized in that, The valve device is a relay valve.

14. The valve device as claimed in claim 13, characterized in that, The valve device is a relay valve in the vehicle's pneumatic braking system.

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