WO2022073886A1

WO2022073886A1 - Valve assembly arrangement for an injection valve and injection valve

Info

Publication number: WO2022073886A1
Application number: PCT/EP2021/077159
Authority: WO
Inventors: Harry SCHÜLE; Mauro Grandi
Original assignee: Vitesco Technologies GmbH
Priority date: 2020-10-09
Filing date: 2021-10-01
Publication date: 2022-04-14
Also published as: DE102020212763A1; DE112021005367T5

Abstract

The invention relates to a Valve assembly arrangement (20) for an injection valve (10), wherein the valve assembly arrangement (20) has a central longitudinal axis (30) and comprises a cold valve assembly (100), a transition passage (170) and a hot valve assembly (200), wherein the cold valve assembly (100) is of the inward opening type, and wherein the transition passage (170) is arranged in fluid flow direction downstream of the cold valve assembly (100), and wherein the hot valve assembly (200) is arranged in fluid flow direction downstream of the transition passage (170).

Description

Valve assembly arrangement for an injection valve and injection valve

The invention relates to a valve assembly arrangement for an injection valve and an injection valve.

Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose a fluid into an intake manifold of the internal combustion engine or directly into a combustion chamber of a cylinder of the internal combustion engine.

Injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example their length, their diameter and also various elements of the injection valve being responsible for the way the fluid is dozed may vary in a wide range. In addition to that, injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator. Due to environmental and/or legislative reasons, it may be necessary to use gases like hydrogen or compressed natural gas (CNG, methane) as fuel for internal combustion engines. These gases can be produced out of renewable energies such as wind or solar power in a process known as power to gas. For example, hydrogen can be produced via electrolyze and methane can be produced from a synthesis of hydrogen and CO2. These gases are then CO2 neutral and can contribute to a reduction of climate change. Methane and hydrogen applications are not limited to internal combustion engines. These are flexible gases which can also be used in household applications, industry or further engines.

Internal combustion engines are operable with gases like methane or hydrogen in an Otto-cycle. This allows for very low particle emission and NOx emission when compared to the same engine operating with gasoline. The requirements for injecting gases like methane or hydrogen into an internal combustion engine differ from gasoline injection. Therefore, is the design of an injection valve which is used to inject gasoline different from the design of an injection valve which is used to inject gases like hydrogen or methane. A typical example for an injector which is used to inject gases is disclosed in EP 2 602 476 A1.

The current injector design, described in the above-mentioned patent application, for injecting gases comprise two valve needles. This creates the disadvantage that the downstream arranged second valve needle reduces the free gas flow cross-section in this part of the injection valve. This reduces the gas flow rate, which defines how much gas can flow out of the injection valve. In addition, the second valve enhances the complexity of the overall injector design. In particular with the injection of hydrogen it is necessary to increase the gas flow rate out of the injector and to have an overall simplified design. In addition, the combustion of gases, in particular the combustion of hydrogen, requires high temperature resistance of the injection valve.

The object of the present disclosure is therefore to create a valve assembly arrangement for an injection valve and an injection valve which facilitates a reliable and precise injection of gases.

These objects are achieved by a valve assembly arrangement comprising the features of the independent claim and an injection valve comprising the valve assembly arrangement. Advantageous embodiments of the valve assembly arrangement and the injection valve are specified in the dependent claims.

A valve assembly arrangement for an injection valve is specified. The valve assembly arrangement extends along a central longitudinal axis. The valve assembly arrangement comprises a cold valve assembly, a transition passage and a hot valve assembly. The cold valve assembly is in fluid flow direction arranged upstream with respect to the hot valve assembly and the hot valve assembly is in fluid flow direction arranged downstream with respect to the cold valve assembly. The cold valve assembly is therefore arranged further away from a combustion chamber than the hot valve assembly, when arranged in an internal combustion engine. That is why the cold valve assembly is named cold valve and the hot valve assembly is named hot valve.

The cold valve assembly is of an inward opening type. Moveable parts of an inward opening type valve assembly move contrary to the direction into which fluid moves during injection. If for example an inward opening type valve assembly comprises a valve needle which moves to release fluid out of the valve assembly, then the valve needle moves contrary to the fluid flow direction.

According to the present disclosure, the transition passage is arranged in fluid flow direction downstream of the cold valve assembly. That means that if fluid is released out of the cold valve assembly, the fluid streams into the transition passage. Fluid can therefore be released from the cold valve assembly into the transition passage by activation of the cold valve assembly.

According to the present disclosure, the hot valve assembly is arranged in fluid flow direction downstream of the transition passage. The hot valve assembly comprises a hot valve body forming a hot valve flow passage, an axially moveable hot valve element and a hot valve spring. The hot valve element is pressed by the hot valve spring against the transition passage. When the hot valve element is pressed by the hot valve spring against the transition passage the hot valve element is in a closed position. In the closed position the hot valve element prevents fluid flow out of the transition passage. In further positions of the hot valve element the hot valve element and the hot valve spring allow fluid flow out of the transition passage into the hot valve flow passage. This is achieved by movement of the hot valve element into further positions when the pressure inside the transition passage increases due to operation of the cold valve assembly. The increased pressure in the transition passage increases the pressure force which acts on the hot valve element which may exceed the spring force of the hot valve spring. If the pressure force exceeds the spring force, the hot valve element is moved away from the closed position so that the fluid is released from the transition passage into the hot valve flow passage. The hot valve assembly act as an outward opening passive valve. The hot valve element is for example a cap or a cylinder. According to another embodiment, the hot valve element has a ring shape.

The hot valve flow passage releases the fluid out of the valve assembly arrangement. According to one embodiment, the hot valve flow passage releases the fluid into a combustion chamber of an internal combustion engine. The cold valve assembly is protected by the hot valve assembly, in particular via the hot valve element from hot temperatures of the internal combustion engine. Further, the hot valve assembly does not comprise any valve needle, so that the cross-section of the hot valve flow passage is significantly increased which increases the fluid flow rate. In addition, there is no pressure drop at the exit of the hot valve flow passage. Further, the valve thickness of the hot vale body can be increased due to the fact that no valve needle is required which leads to higher robustness against bending during mounting of the valve assembly arrangement and which leads to higher temperature resistance. The higher temperature resistance is in particular important with hydrogen injection. Due to the missing valve needle in the hot valve assembly it is possible to increase the thickness of the hot valve body. The increased hot valve body thickness increases its heat capacity which increased temperature resistance during combustion phase and the hot gas entrainment into the hot valve flow passage. The hot valve element is arranged at the upstream longitudinal end of the hot valve assembly so that the hot valve element itself is also protected from the high temperatures by the gas buffer in the hot valve flow passage. Further, the hot valve element seals between the hot valve assembly and the transition passage which protects the cold valve assembly from the high combustion pressure. Overall, the whole design of the valve assembly arrangement is simplified without losing any functionality and improves the injection of gaseous fluids.

According to one embodiment, the cold valve assembly arrangement comprises a cold valve body comprising a cold valve cavity with a cold valve fluid inlet and a cold valve fluid outlet. The cold valve body is according to one embodiment part of the housing of the valve assembly arrangement. The cold valve body creates within its interior the cold valve cavity. The fluid flows through the cold valve cavity from the fluid inlet portion to the cold valve fluid outlet portion. According to this embodiment, the cold valve assembly comprises further a cold valve needle which is arranged axially moveable in the cold valve cavity. The cold valve needle prevents a fluid flow through the cold vale fluid outlet portion when the cold valve needle is in a closed position. The cold valve needle allows the fluid flow through the cold valve fluid outlet portion into the transition portion assembly when the cold valve needle is in further positions. According to this embodiment, the cold valve assembly further comprises an actuator unit which is designed to actuate a cold valve needle. The cold valve needle can with the actuator unit be moved from the closed position into further position allowing the fluid flow out of the cold valve assembly into the transition passage. The cold valve assembly according to this embodiment is in particular easy and simple to create the valve assembly of the inward opening type.

According to one embodiment, the transition passage comprises a transition passage disc. The transition passage disc comprises according to this embodiment transition passage openings which extend in axial direction for the fluid flow along the transition passage. The transition passage disc is arranged within the housing of the valve assembly arrangement. The housing of the valve assembly arrangement comprises the cold valve body and the hot valve body, forming the outer shell of the valve assembly arrangement. According to one embodiment, the transition passage is arranged in the cold valve cavity created by the cold valve body. According to another embodiment, the transition passage disc is arranged in the hot valve body. The transition passage disc is for example arranged at the valve assembly arrangement housing via press fit, force fit and I or material bond. The transition passage openings allow fluid to flow through the transition passage when the cold valve assembly allows the fluid to flow into the transition passage and when the hot valve assembly allows the fluid to flow out of the transition passage. The transition passage openings are sealable by the cold valve assembly at their upstream ends and the transition passage openings are sealable by the hot valve element at their downstream ends. The upstream ends are the ends of the transition passage opening which are located near the cold valve assembly and the downstream ends of the transition passage openings are the ends which are located near the hot valve assembly. With the transition passage openings, it is in particular easy and simple to guide the fluid flow from the cold valve assembly through the transition passage into the hot valve assembly. Further, it is in particular simple to seal the transition passage from the cold valve assembly and the hot valve assembly.

According to one embodiment, the transition passage disc is arranged coaxially with respect to the longitudinal axis and the transition passage openings are arranged on an imagined circle which is also arranged coaxially with respect to the longitudinal axis. According to this embodiment the fluid flow through the transition passage is symmetrical in particular and therefore improved. The transition passage disc comprises according to this embodiment an opening circle (bore circle). The center of the opening circle is according to this embodiment coaxially with respect to the central longitudinal axis. According to one embodiment, the transition passage openings are arranged symmetrical around the imagined circle. According to another embodiment, the transition passage openings are arranged on a plurality of concentric imagined circles. According to another embodiment, the transition passage openings are slots, for example three slots, evenly distributed on the imagined circle. This increases advantageously the fluid flow through the transition passage.

According to one embodiment, the hot valve element has a sleeve shape and contacts with a radial outer surface at least partially the housing of the valve assembly arrangement. According to this embodiment, the hot valve element contacts for example the hot valve body or the cold valve body. The contact allows guidance of the movement of the hot valve element. With the sleeve shape of the hot valve element tilting of the hot valve element during operation and assembly of the valve assembly arrangement can be reduced and I or avoided. This improves the overall functionality of the valve assembly arrangement. Further, the sleeve shape of the hot valve element and the contact of the outer surface of the hot valve element with the housing of the valve assembly allows a particular good axially and radially guidance of the movement of the hot valve element, which improves the functionality of the valve assembly arrangement. The hot valve element according to this embodiment, contacts with one longitudinal end and the transition passage in its closed position and seals between the transition passage and the hot valve assembly. The longitudinal end has a ring shape and has radii to seal the transition passage openings which are for example also arranged on the imagined circle.

According to one embodiment, the spring force exerted by the hot valve spring onto the hot valve element is designed to move and keep the hot valve element into the closed position when no fluid is released from the cold valve assembly into the transition passage and to allow the movement of the hot valve element into further position when a predefined pressure in the transition passage is reached which acts on the hot valve element. It is possible to create a desired pressure inside the transition passage, for example in the transition passage openings, before the fluid is released into the hot valve assembly. The control of the fluid flow into the hot valve assembly is thereby improvable.

According to one embodiment, the hot valve body comprises a rest for the hot valve spring and the hot valve element comprises a rest for the hot valve spring. The rest for the hot valve spring on the hot valve body is for example a depression or a protrusion in the hot valve body. The rest for the hot valve spring on the hot valve element is also for example a depression or a protrusion on the hot valve element. In addition, it is also conceivable that the rest on the hot valve element or on the hot valve body is only an outer surface of the hot valve body or the hot valve element. According to this embodiment, it is in particular simple to arrange the hot valve spring within the valve assembly arrangement to allow the hot valve spring to exert the spring force on the hot valve element.

According to one embodiment, the cold valve assembly, the transition passage and the hot valve assembly are arranged coaxially with respect to the central longitudinal axis. According to this embodiment, the fluid flow through the whole valve assembly arrangement is improved because the fluid flow obstacles and/or friction is reduced.

According to one embodiment, the hot valve assembly comprises a hot valve stop for limiting axial displacement of the hot valve element. The hot valve stop is according to one embodiment a surface, a protrusion or a depression on the hot valve body. According to another embodiment it is also conceivable, that the hot valve stop is formed by a part of the cold valve body or an additional part. With the hot valve stop it is possible to limit the fluid flow out of the transition passage, because the distance from the hot valve element and the transition passage can be designed in order to allow a maximum fluid flow out of the transition passage. With the hot valve stop it is in particular simple to control the fluid flow out of the transition passage into the hot valve flow passage and further into the combustion chamber of the internal combustion engine.

According to one embodiment, the hot valve element is made of metal, preferably of steel or brass. Metal can be shaped easily to create the desired shape for the hot valve element. In addition, metal is cheap which allows to produce the whole valve assembly arrangement with reduced costs. In addition, metal and in particular steel provide high thermal resistance which can be crucial for sealing requirements. According to one embodiment the hot valve element is made of brass, which creates the advantage that the guidance of the hot valve element via the housing of the valve assembly arrangement can be improved due to good gliding properties of brass.

According to one embodiment, the hot valve element is made of a high temperature resistant plastic material. Such high temperature resistant plastic materials have good gliding properties. This is important due to the fact, that there is no lubrication in the gaseous fluid stream which reduces the friction of the movement of the hot valve element. In addition, no additional valve sealing and on the hot valve element is required if the hot valve element is made out of high thermal resistant plastic material, because the plastic material can provide good enough sealing properties between the hot valve element and the transition passage. In addition, high temperature resistant plastic materials are cheaper than metal parts. According to one embodiment, the hot valve element is made out of polytetrafluoroethylene (Teflon) or polyetheretherketone (PEEK). Those materials are well-known in the industry and provide the desired high temperature resistant properties, good gliding properties and sealing properties which are required for the hot valve element to function. According to one embodiment, extends the hot valve flow passage through the hot valve body and is free of steps and or kinks in fluid flow direction downstream of the hot valve spring or downstream of the rest for the hot valve spring on the hot valve body until a hot valve flow exit. The fluid flow through the hot valve flow passage is thereby not deflected by any step or kink until the hot valve flow exit. In addition, the fluid flow is according to this embodiment also not deflected out of the hot valve flow exit into the combustion chamber. It is therefore possible to prevent the fluid flow from negative impacts of a potential “Coana-effect”. According to one embodiment, it is conceivable that the hot valve flow exit comprises a chamfer or a rounding.

According to one embodiment, the cold valve assembly comprises a cold valve sealing element for sealing between the cold valve assembly and the transition passage and/or wherein the hot valve assembly comprises a hot valve sealing element for sealing between the hot valve sealing assembly and the transition passage. The cold valve sealing element is for example a sealing ring, a sealing tape or a sealing coating. The hot valve element is for example a sealing ring, a sealing rape or a sealing coating. The cold valve sealing element is arranged for example on the cold valve needle and is pressed by the cold valve needle onto the transition passage openings to seal between the cold calve assembly and the transition passage. The hot valve sealing element is arranged for example on the hot valve element for sealing between the transition passage and the hot valve assembly. The hot valve sealing element is for example added as a rubber coating on the hot valve element. The cold valve sealing element and the hot valve sealing element create improved sealing between the cold valve assembly, the transition passage and the hot valve assembly in a simple and easy manner. As described above the hot valve sealing element can be realized by the hot valve element itself if the hot valve element itself is made out of high temperature resistant plastic which has the required sealing properties.

According to one embodiment, the fluid flow through the valve assembly arrangement in fluid flow direction is from the cold valve assembly into the transition passage, along the hot valve element, the hot valve spring, the hot valve flow passage and through the cold valve exit out of the cold valve assembly. Further advantageous embodiments of the present disclosure will become apparent from the detailed description of exemplary embodiments in connection with the figures. In the figures:

Fig. 1 shows a schematic longitudinal section of an injection valve according to an exemplary embodiment,

Fig. 2 shows another schematic longitudinal section of an injection valve according to the exemplary embodiment,

Fig. 3 shows a detail of the schematic longitudinal cross-section of the valve assembly arrangement according to the exemplary embodiment.

The figures 1 , 2 and 3 show a valve assembly arrangement 20 for an injection valve 10. The injection valve 10 and the valve assembly arrangement 20 extend along a central longitudinal axis 30. The vale assembly arrangement 20 comprises a cold valve assembly 100, a transition passage 170 and a hot valve assembly 200.

The cold valve assembly 100 comprises a cold valve body 140 which forms a cold valve cavity 142 for housing parts of the cold valve assembly 100 like a cold valve needle 120. The cold valve needle 120 is arranged coaxially with respect to the central longitudinal axis 30 and is arranged moveable within the cold valve cavity 142. The cold valve cavity 142 comprises a cold valve fluid inlet portion and a cold valve outlet portion. The cold valve fluid inlet portion is designed to allow fluid flow into the cold valve cavity 142 and the cold valve fluid outlet portion is designed to allow fluid flow out of the cold valve cavity 142. The cold valve needle 120 is designed to prevent fluid flow out of the cold valve cavity 142 when the cold valve needle 120 is in a closed position. The cold valve needle 120 is in addition designed to allow fluid flow out of the cold valve cavity 142 when the cold valve needle 120 is in further position. The cold valve assembly 100 further comprises a cold valve spring 110, also named calibration spring, which is designed to exert a spring force to the cold valve needle 120 which biases the cold valve needle 120 into the closed position. The cold valve assembly 100 further comprises an actuator unit 130 which is designed to displace the cold valve needle 120 away from the closed position. The actuator unit 130 comprises an armature 135 and a pole piece 160. A solenoid is not shown in the figures. The actuator unit 130 exerts a magnetic force onto the armature 135 which is transferred to the cold valve needle 120 so that the cold valve needle 120 moves from the closed position to further positions allowing fluid to flow out of the cold valve cavity 142.

The cold valve needle 120 is according to this embodiment a hollow shaft. The hollow shaft creates the advantage that the fluid flow from the cold valve fluid inlet portion to the cold valve fluid outlet portion is improved. The cold valve needle tip is according to this embodiment of a ring shape. The cold valve needle tip comprises a cold valve sealing element 150 which is for example made of rubber and which is arranged on the cold valve needle tip to seal between the cold valve assembly 120 and the transition passage 170. When the cold valve needle 120 is displaced away from the closed position the cold valve assembly 100 releases fluid out of the cold valve cavity 142 into the transition passage 170.

The transition passage 170 is according to this embodiment arranged in fluid flow direction downstream of the cold valve assembly 100 and in addition it is arranged coaxially with respect to the central longitudinal axis 30. The transition passage 170 comprises a transition passage disc 175. The transition passage disc 175 is according to this embodiment arranged within the cold valve body 140. The transition passage disc 175 can for example also be arranged within parts of the hot valve assembly 200. The transition passage disc 175 is for example arranged via press fit, form fit or material bond at the valve assembly arrangement 20. The transition passage disc 175 according to this embodiment comprises transition passage openings 180. The transition passage openings 180 extend in longitudinal direction from one side of the transition passage disc 175 through the transition passage disc 175 until the other side of the transition passage disc 175. The transition passage openings 180 allow therefore fluid to flow through the transition passage disc 175 and therefore through the transition passage 170. The transition passage openings 180 are according to this embodiments holes which are drilled through the transition passage disc 175. The transition passage openings 180 are according to this embodiment arranged on an imagined concentric circle on the transition passage disc 175 wherein the imagined circle is arranged coaxially with respect to the central longitudinal axis 30. In addition, according to one embodiment it is also conceivable, that the transition passage openings 180 are distributed around the imagined circle equally. According to another embodiment, the transition passage openings 180 are slots, for example three slots.

According to this embodiment comprises the transition passage 170 further a transition passage washer 176, which is arranged between the transition passage disc 175 and the cold valve assembly 100, in particular between the cold valve needle 120. According to this embodiment, the transition passage washer 176 comprises openings in slot forms, for example three, which are arranged on an imagined concentric circle and evenly distributed around the circle allowing the fluid flow through the transition passage washer 176.

The transition passage 170 creates a fluid flow passage from the cold valve assembly 100 to the hot valve assembly 200. The hot valve assembly 200 comprises a hot valve body 210 which forms a hot valve flow passage 270 (hot valve cavity). The hot valve flow passage 270 is designed to allow the fluid flow through the hot valve assembly 200. The hot valve flow passage 270 has therefore a hot valve inlet portion and a hot valve outlet portion. The hot valve inlet portion guides the fluid flow from the transition passage 170 into the hot valve flow passage 270. The hot valve outlet portion guides the fluid flow out of the hot valve flow passage 270 and out of the hot valve assembly 200, for example into a combustion chamber of an internal combustion engine. The hot valve assembly 200 further comprises a hot valve element 230 and a hot valve spring 240. The hot valve assembly 200 is arranged as described above in fluid flow direction downstream of the transition passage 170. Further, according to this embodiment, the hot valve assembly 200 is arranged coaxially with respect to the longitudinal axis 30. According to this embodiment, the hot valve body 210 is fixed to the cold valve body via press fit. It is according to one another embodiment also conceivable that the hot valve body 210 is fixed to the cold valve body via form fit and / or material bond. The hot valve element 220 is biased by the hot valve spring 240 against the transition passage 170 to prevent the fluid flow out of the transition passage 170 when the hot valve element 220 is in its closed position. The hot valve element 220 is arranged moveable within the hot valve assembly 200 and is therefore designed to allow the fluid flow out of the transition passage 170 when displaced away from the closed position to further positions. The hot valve element 220 is according to this embodiment arranged coaxially with the central longitudinal axis 30. The hot valve element 220 has a sleeve shape and seals with one longitudinal end the transition passage openings 180 in the closed position to prevent the fluid flow out of the transition passage 170. The hot valve element 220 comprises according to this embodiment a hot valve sealing element 230. The hot valve sealing element 230 is for example a rubber ring or coating which is fixed to the sealing end of the hot valve element 220 to seal between the hot valve element 220 and the transition passage openings 180 when the hot valve elements 220 is in the closed position. The hot valve assembly 200 provides a hot valve element guidance 250 for the hot valve element 220 to guide the movement of the hot valve element 220. The hot valve element guidance 250 is according to this embodiment the housing of the valve assembly arrangement 20. According to this embodiment, the housing of the valve assembly arrangement 20 is the cold valve body 140 and the hot valve body 210. In detail, surfaces of the cold valve cavity 142 and/or surfaces of the hot valve flow passage 270 provide a guiding surface as hot valve element guidance 250 to guide the hot valve gap 220. As shown in fig. 1 and fig. 2, the hot valve body 210 has on its outer surface a depression which creates a portion to arrange a combustion seal 260. The combustion seal itself 260 is not shown in the figs. 1 and 2. The combustion seal 260 is designed to seal between the combustion chamber and the injection valve 10. The hot valve assembly 200 further comprises a hot valve stop 290. The hot valve stop 290 provides a stop for the hot valve element 220 which limits the movement of the hot valve element 220 to control a maximum fluid flow out of the transition passage 170. The hot valve element 220 has according to this embodiment a depression to provide a rest for the hot valve spring 240. The hot valve body 210 has according to this embodiment also a depression to provide a rest for the hot valve spring 240. The hot valve flow passage 270 comprises a hot valve flow exit 280 which is the outlet portion of the hot valve flow passage to and which guides the fluid flow out of the hot valve assembly 200 for example into the combustion chamber of the internal combustion engine.

Claims

Patent claims

1 . Valve assembly arrangement (20) for an injection valve (10), wherein the valve assembly arrangement (20) has a central longitudinal axis (30) and comprises a cold valve assembly (100), a transition passage (170) and a hot valve assembly (200), wherein the cold valve assembly (100) is of the inward opening type, and wherein the transition passage (170) is arranged in fluid flow direction downstream of the cold valve assembly (100) so that fluid can be released from the cold valve assembly (100) into the transition passage (170) when the cold valve assembly (100) is in operation, and wherein the hot valve assembly (200) is arranged in fluid flow direction downstream of the transition passage (170) and comprises a hot valve body (210) forming a hot valve flow passage (270), an axially movable hot valve element (220) and a hot valve spring (240), wherein the hot valve element (220) is pressed by the hot valve spring (240) against the transition passage (170) to prevent the fluid flow out of the transition passage (170) in a closed position, and wherein the hot valve element (220) and the hot valve spring (240) allow fluid flow out of the transition passage (170) into the hot valve flow passage (270) by movement of the hot valve element (220) into further positions when the pressure inside the transition passage (170) increases due to operation of the cold valve assembly (100).

2. Valve assembly arrangement (20) according to claim 1 , wherein the cold valve assembly (100) comprises a cold valve body (140) comprising a cold valve cavity (142) with a cold valve fluid inlet portion and a cold valve fluid outlet portion, a cold valve needle (120) axially movable in the cold valve cavity (142), preventing a fluid flow through the cold valve fluid outlet portion in a closed position and releasing the fluid flow through the cold valve fluid outlet portion into the transition passage (170) in further positions, and an actuator unit (130) being designed to actuate the cold valve needle

(120). 3. Valve assembly arrangement (20) according to any preceding claim, wherein the transition passage (170) comprises a transition passage disk (175) with transition passage openings (180) which extend in axial direction for the fluid flow along the transition passage (170), wherein the transition passage openings (180) are sealable by the cold valve assembly (100) at their upstream ends, and wherein the transition passage openings (180) are sealable by the hot valve element (220) at their downstream ends.

4. Valve assembly arrangement (20) according to claim 3, wherein the transition passage disk (175) is arranged coaxially with respect to the longitudinal axis (30) and wherein the transition passage openings (180) are arranged on an imagined circle which is also arranged coaxially with respect to the longitudinal axis (30).

5. Valve assembly arrangement (20) according to any preceding claim, wherein the hot valve element (220) has a sleeve shape and contacts with an outer surface at least partially a housing of the valve assembly arrangement (20) whereby the movement of the hot valve element (220) is guided by the housing of the valve assembly arrangement (20).

6. Valve assembly arrangement (20) according to any preceding claim, wherein the spring force exerted by the hot valve spring (240) to the hot valve element (220) is designed to move and keep the hot valve element (220) into the closed position when no fluid is released from the cold valve assembly (100) into the transition passage (170) and to allow the movement of the hot valve element (220) into further positions when a predefined pressure in the transition passage (170) is reached which acts on the hot valve element (220).

7. Valve assembly arrangement (20) according to any preceding claim, wherein the hot valve body (210) comprises a rest for the hot valve spring (240) and wherein the hot valve element (220) comprises a rest for the hot valve spring (240). 17

8. Valve assembly arrangement (20) according to any preceding claim, wherein the cold valve assembly (100), the transition passage (170) and the hot valve assembly (200) are arranged coaxially with respect to the central longitudinal axis (30).

9. Valve assembly arrangement (20) according to any preceding claim, wherein the hot valve assembly (200) comprises a hot valve stop (290) for limiting axial displacement of the hot valve element (220).

10. Valve assembly arrangement (20) according to any preceding claim, wherein the hot valve element (220) is made of metal, preferably of steel or brass.

11 . Valve assembly arrangement (20) according to one of the claims 1 to 9, wherein the hot valve element (220) is made of a high temperature resistant plastic material, preferably of Polytetrafluorethylen or Polyetheretherketon.

12. Valve assembly arrangement (20) according to any preceding claim, wherein the hot valve flow passage (270) extends through the hot valve body (210) and is free of steps and or kinks in fluid flow direction downstream of the hot valve spring (240) or downstream of the rest for the hot valve spring (240) on the hot valve body (210) until a hot valve flow exit (280).

13. Valve assembly arrangement (20) according to any preceding claim, wherein the cold valve assembly (100) comprises a cold valve sealing element (150) for sealing between the cold valve assembly (100) and the transition passage (170) and I or wherein the hot valve assembly (100) comprises a hot valve sealing element (230) for sealing between the hot valve assembly (100) and the transition passage (170).

14. Injection valve (10) with a valve assembly arrangement (20) according to any one of the preceding claims.