BE1030919B1 - Solenoid valve and equipment with solenoid valve - Google Patents

Abstract

A solenoid valve (10) includes a body (12) with a main fluid inlet (14), a main fluid outlet (16) and a main passage (18) which connects the main inlet to the main outlet ; a main valve (20) with a shutter (38), the main valve (20) being movable between a position of closing of the main passage (18) by the shutter (38) and an opening position of the main passage ( 18), the main valve comprising an auxiliary fluid inlet (22) in communication with the main inlet and an auxiliary fluid outlet (24) in communication with the main outlet; an intermediate chamber (26) connecting the auxiliary inlet and the auxiliary outlet and a pilot valve (28) movable between a closed state of the auxiliary inlet and a closed state of the auxiliary outlet and to drive the main valve towards the open position. The invention also relates to equipment with the solenoid valve.

Description

Solenoid valve and equipment with solenoid valve

Technical area

The present invention relates to a solenoid valve and equipment with the solenoid valve.

Prior art

Document EP2921753 discloses a valve for cryogenic gas. The valve includes a body with a main inlet, a main outlet, and a main passage that connects the main inlet to the main outlet. The valve also includes a main shutter of the main passage, the main shutter having an auxiliary inlet, an auxiliary outlet in communication with the main outlet and an auxiliary passage which connects the auxiliary inlet to the auxiliary outlet. The valve further includes an auxiliary shutter including a closing surface configured to cut off the auxiliary passage and to drive the main shutter in the closing direction. The auxiliary shutter further comprises a driving surface configured to drive the main shutter in the direction of opening by bearing on the edge of the auxiliary inlet and partially blocking it in order to slow down a flow.

The disadvantage of this valve is that it can only be used with a gaseous fluid, which restricts the range of use of this valve.

There is a need for a valve with a wider range of use.

Presentation of the invention

For this purpose, the invention proposes a solenoid valve comprising a body with a main fluid inlet, a main fluid outlet and a main passage which connects the main inlet to the main outlet; a main valve with a shutter, the main valve being movable between a position of closing of the main passage by the shutter and an opening position of the main passage, the main valve comprising an auxiliary fluid inlet in communication with the inlet main and an auxiliary fluid outlet in communication with the main outlet; an intermediate chamber connecting the auxiliary input and the auxiliary output; a movable pilot valve between a shuttered state of the auxiliary inlet and a closed state of the auxiliary outlet and to drive the main valve towards the open position.

According to a variant, the pilot valve is also configured to drive the main valve towards the position of closing the main passage.

According to a variant, the pilot valve is configured to drive the main valve towards the opening position by biasing a surface of the main valve or towards the closed position by biasing another surface of the main valve.

According to a variant, the pilot valve is in a bore of the main valve, the radial movement of the pilot valve in the bore maintaining the seal of the shutter of the auxiliary inlet or the auxiliary outlet.

According to a variant, the axial movement of the pilot valve is less than the axial movement of the main valve.

According to one variant, the solenoid valve is able to receive the fluid which is propellant in the liquid monophasic state, in the gaseous monophasic state or in the liquid and gaseous two-phase state.

According to a variant, the solenoid valve further comprises an enclosure, the main valve comprising a movable piston in the enclosure and separating the intermediate chamber from the main inlet within the enclosure.

Alternatively, the auxiliary inlet is in the piston and the auxiliary outlet is in the actuating rod.

According to a variant, the main valve is driven towards the opening position of the main passage with the pilot valve in the state of closing the auxiliary inlet and by emptying the intermediate chamber towards the main outlet.

According to a variant, the solenoid valve further comprises an enclosure, the main valve comprising a movable piston in the enclosure and separating the intermediate chamber from the main outlet within the enclosure.

Alternatively, the auxiliary input is in the actuating rod and the auxiliary output is in the piston.

According to a variant, the main valve is driven towards the opening position of the main passage with the pilot valve in the state of closing the auxiliary outlet and by filling the intermediate chamber from the main inlet.

According to a variant, the main valve comprises an actuating rod connecting the piston to the shutter.

According to a variant, the solenoid valve comprises an electromagnetic actuator with a solenoid and a ferromagnetic core actuated by the magnetic flux of the solenoid, the pilot valve being actuated by the core.

The invention also relates to equipment with a solenoid valve as described above, the equipment being aerospace or aeronautical equipment, such as a space launcher or an aircraft turbomachine powered by hydrogen or a space launcher.

The use, in this document, of the verb “understand”, its variants, as well as its conjugations, cannot in any way exclude the presence of elements other than those mentioned. The use, in this document, of the indefinite article “un”, “une”, or the definite article “le”, “la” or “1”, to introduce an element does not exclude the presence of a plurality of these elements.

The terms “first”, “second”, “third”, etc. are, for their part, used within the framework of this document exclusively to differentiate different elements, without implying an order between these elements.

All of the preferred embodiments as well as all of the advantages of the solenoid valve according to the invention are transposed mutatis mutandis to the present equipment and vice versa. The different embodiments can be considered alone or in combination.

Brief description of the figures

Other characteristics and advantages of the present invention will appear on reading the detailed description which follows for the understanding of which we will refer to the appended figures which show: - Figure 1, a schematic view of an example of embodiment of the valve according to the invention;

- Figure 2, a schematic view of another embodiment of the valve according to the invention; - Figures 3 and 4, schematic views of another embodiment of the valve according to the invention.

Figure drawings are not to scale. Similar elements are generally denoted by like references in the figures. In the context of this document, identical or similar elements may bear the same references. Furthermore, the presence of reference numbers or letters in the drawings cannot be considered limiting, including when these numbers or letters are indicated in the claims.

Detailed description of embodiments of the invention

A solenoid valve includes a body with a main fluid inlet, a main fluid outlet, and a main passage that connects the main inlet to the main outlet. The solenoid valve also comprises a main valve with a shutter, the main valve being movable between a position of closing the main passage by means of a shutter and an opening position of the main passage, the main valve comprising an auxiliary fluid inlet in communication with the main inlet and an auxiliary fluid outlet in communication with the main outlet. The solenoid valve also comprises an intermediate chamber connecting the auxiliary inlet and the auxiliary outlet as well as a movable pilot valve between a state of closure of the auxiliary inlet and a state of closure of the auxiliary outlet and for driving the valve main towards the open position. Thanks to the pilot valve, the solenoid valve allows better management of the auxiliary input and the auxiliary output and therefore better control of the intermediate chamber. This makes it possible to extend the range of use of the solenoid valve, with a fluid in liquid, gaseous or two-phase state.

Figures 1 to 4 illustrate embodiments of the solenoid valve according to the invention. In the figures, the solenoid valve 10 comprises a body 12 with a main fluid inlet 14 and a main fluid outlet 16. A main passage 18 connects the main inlet 14 to the main outlet 16. The main passage 18 makes it possible to put the main inlet 14 and the main outlet 16 in fluid communication.

The solenoid valve 10 also includes a main valve 20 movable between a closing position of the main passage 18 and an opening position of the main passage 18. The movement of the main valve 20 towards the open position or towards the closed position makes it possible to control the distribution of a fluid towards distribution circuits within equipment in which the solenoid valve is implemented.

In the figures, the high pressure zones are shown darker than the intermediate pressure zones, which are themselves darker than the low pressure zones.

The main valve 20 comprises an auxiliary fluid inlet 22 in communication with the main inlet 14 and an auxiliary fluid outlet 24 in communication with the main outlet 16. The solenoid valve 10 comprises an intermediate chamber 26 which connects the auxiliary inlet 22 and the auxiliary outlet 24. The communication of the auxiliary inlet 22 with the main inlet 14 allows the filling of the intermediate chamber 26 from the main inlet 14 and thus the increase in the pressure in the intermediate chamber 26. The communication of the auxiliary outlet 24 with the main outlet 16 allows the emptying of the intermediate chamber 26 towards the main outlet 16 and thus the reduction of the pressure in the intermediate chamber 26.

The solenoid valve also includes a pilot valve 28 movable between a closed state of the auxiliary inlet 22 and a closed state of the auxiliary outlet 24.

This allows better management of the opening or closing of each of the auxiliary input and auxiliary output. Thus, the pilot valve allows better control of the pressure in the intermediate chamber. This makes it possible to extend the range of use of the solenoid valve, with a fluid in liquid, gaseous or two-phase state. Also, the pilot valve 28 can drive the main valve 20 towards the open position. Thus, the main passage can be opened by the combination of the action of the pilot valve and the management of the pressure in the intermediate chamber. In addition, the pilot valve 28 can be configured to drive the main valve 20 towards the closing position of the main passage 18. In a more general manner therefore, the solenoid valve is activated in one direction or the other by the combination of the action of the pilot valve and the management of the pressure in the intermediate chamber.

According to Figures 1 to 4, the pilot valve 28 is configured to drive the main valve 20 towards the opening position by biasing a surface 30 of the main valve and to drive the main valve 20 towards the closed position by biasing of another surface 32 of the main valve 20. The main valve 20 is then driven by bias of the pilot valve 28 and by the management of the pressure in the intermediate chamber 26. In Figures 3 and 4, only the surface 30 of the valve main 20 allowing the driving of the main valve 20 towards the open position is shown; surface 32 could also be represented.

The pilot valve 28 can be in a bore 34 of the main valve 20. The radial movement of the pilot valve 28 in the bore 34 maintains the sealing of the shutter of the auxiliary inlet or the auxiliary outlet. The clearance of the radial travel is sufficient to allow the relative movement in all circumstances of the pilot valve but sufficiently low to significantly reduce the leakage section when the pilot valve is opposite the auxiliary inlet 22 (filling pipe - leak along the arrow through the pilot valve 28 according to the middle position of Figure 1 which is reduced significantly) or the auxiliary outlet 24 (drain conduit, Figures 3 and 4). This allows radial sealing at the auxiliary inlet 22 (filling conduit) or the auxiliary outlet 24 (draining conduit) which is independent of the relative movements of the parts.

This makes it possible in particular to eliminate vibrations in the solenoid valve, while ensuring the management of the auxiliary input and the auxiliary output and therefore the control of the intermediate chamber. This further improves the management of flows in the auxiliary inlet 22 (filling channel or conduit) and in the auxiliary outlet 24 (drainage channel or conduit).

According to Figures 1 and 3-4, the pilot valve 28 comprises a conduit 29 allowing the intermediate chamber 26 to be placed in communication with the downstream (or main outlet 16) via the auxiliary outlet 24.

According to one embodiment, the main valve 20 comprises a shutter 38 of the main passage 18. The shutter 38 has a shape matching the periphery of the main passage 18 so as to ensure sealing between the main inlet 14 and the main outlet 16, in shutter position. The main valve 20 may also include an actuating rod 40 connecting a piston 42 to the shutter 38. The piston 42 is movable in an enclosure 44 of the body 12 of the solenoid valve. The piston 42 delimits the intermediate chamber 26 with one end of the enclosure 44. The piston can also delimit the main inlet 14 or the main outlet 16 with the main passage 18 - as described below. The actuating rod 40 may be hollow to connect the intermediate chamber 26 to the main inlet 14 or the main outlet 16 — as described below. A sealing element 46 on the main valve 20, or more precisely on the piston 42, ensures the sealing of the intermediate chamber 26.

Not shown, the solenoid valve 10 further comprises an electromagnetic actuator. The actuator has a solenoid and a ferromagnetic core actuated by the magnetic flux of the solenoid. The pilot valve 28 is actuated by the core via a rod 36 in the figures. Such an actuator has the advantage of being light and simple to control since you only need to apply a voltage to activate it. Furthermore, such an actuator has the advantage of being quick to operate, which makes the activation of the pilot valve 28 also quick to operate.

The fluid used in the solenoid valve is propellant in the liquid single-phase state, in the gaseous single-phase state or in the liquid and gaseous two-phase state.

The solenoid valve is therefore a propellant-assisted valve with a solenoid actuator which uses the force available in the pressure of the fluid to actuate by managing the pressure in the intermediate chamber 26. Such a solenoid valve 10 is not dependent on its integration in the equipment because it incorporates its own intermediate chamber (balancing chamber). The performance of the solenoid valve is dependent on the operating conditions (pressure, temperature of the fluid and the environment, etc.), but within a very wide range of values. Unlike valves of the prior art, such as oil,

the solenoid valve 10 is used with propellants (for example, oxygen, hydrogen, methane) which can be in the liquid phase, vapor (gaseous) or a combination of the two over a temperature range of 77K to 320K or more and a range pressure from 0 to 230bar or more. These operating ranges are very wide compared to valves of the prior art. The operating pressure and temperature ranges of the solenoid valve 10 cover different states of matter (liquid and/or gas). The management of opening and closing of the auxiliary inlet 22 and outlet 24 by the pilot valve 28 and the pressure in the intermediate chamber 26 allow the solenoid valve 10 to operate even though the operating pressure and temperature ranges involve significant changes in certain properties (density, compressibility, etc.). This is not possible in the valves of the prior art, such as for example oil valves, which are always used with a fluid (oil for example) in a single-phase phase (liquid) with relatively low (in)compressibility. constant and a relatively constant density.

Figure 1 illustrates an example of a possible embodiment with the intermediate chamber 26 located upstream of the solenoid valve. In this embodiment, the intermediate chamber 26 is filled when the solenoid valve is closed and partially empties to allow opening. The piston 42 of the main valve 20 separates the intermediate chamber 26 from the main inlet 14 within the enclosure 44.

The auxiliary inlet 22 is in the piston 42 and the auxiliary outlet 24 is in the actuating rod 40. In Figure 1, the solenoid valve 10 is provided with an axial discharge and a radial supply. Three positions are illustrated in Figure 1 to show opening of the solenoid valve 10.

According to the left position of Figure 1, the solenoid valve 10 is closed, the shutter 38 ensuring sealing between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of closing the auxiliary outlet 24, requesting the surface 32. The auxiliary inlet 22 is open and puts the intermediate chamber 26 in fluid communication with the main inlet 14. The pressure in the intermediate chamber 16 is the same as upstream of the valve (main inlet 14) and maintains the valve in the closed position (obturator 38 on the seat of the main passage 18). The pilot valve 28 contributes to maintaining the valve in the closed position by biasing the surface 32.

According to the middle position of Figure 1, the solenoid valve 10 is always closed, the shutter 38 ensuring sealing between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of shutter of the auxiliary inlet 22, requesting the surface 30. The auxiliary outlet 24 is open and puts the intermediate chamber 26 in fluid communication with the main outlet 16. The intermediate chamber is emptying downstream (towards the outlet main valve 16) via the actuating rod 40. The pressure of the intermediate chamber 26 decreases until a pressure balance is established on the main valve 20.

According to the right-hand position in Figure 1, this equilibrium is exceeded. The upstream pressure (main inlet 14) combined with the action of the pilot valve 28 on the surface 30 makes it possible to move the solenoid valve 10 to the open position. The main valve 20 is driven towards the opening position of the main passage 18 with the pilot valve 28 in the state of closing the auxiliary inlet 22 and by emptying the intermediate chamber 26 towards the main outlet 16.

Figure 2 illustrates another possible embodiment with the intermediate chamber 26 located upstream of the solenoid valve. In this embodiment, the intermediate chamber 26 is filled when the solenoid valve is closed and partially empties to allow opening. The piston 42 of the main valve 20 separates the intermediate chamber 26 from the main inlet 14 within the enclosure 44.

The auxiliary inlet 22 is in the piston 42 and the auxiliary outlet 24 is in the actuating rod 40. Three positions are illustrated in Figure 2 to show the opening of the solenoid valve 10.

According to the left position of Figure 2, the solenoid valve 10 is closed, the shutter 38 ensuring sealing between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of closure of the auxiliary outlet 24, requesting the surface 32. The auxiliary inlet 22 is open and puts the intermediate chamber 26 in fluid communication with the main inlet 14. The pressure in the intermediate chamber 26 is the same as upstream of the valve (main inlet 14) and maintains the valve in the closed position (obturator 38 on the seat of the main passage 18). The pilot valve 28 contributes to maintaining the valve in the closed position by biasing the surface 32.

According to the middle position of Figure 2, the solenoid valve 10 is always closed, the shutter 38 ensuring the seal between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of shutter of the auxiliary inlet 22, requesting the surface 30. The auxiliary outlet 24 is open and puts the intermediate chamber 26 in fluid communication with the main outlet 16. The intermediate chamber is emptying downstream (towards the outlet main valve 16) via the actuating rod 40. The pressure of the intermediate chamber 26 decreases until a pressure balance is established on the main valve 20.

According to the right-hand position in Figure 2, this balance is exceeded. The upstream pressure (main inlet 14) combined with the action of the pilot valve 28 on the surface 30 makes it possible to move the solenoid valve 10 to the open position. The main valve 20 is driven towards the opening position of the main passage 18 with the pilot valve 28 in the state of closing the auxiliary inlet 22 and by emptying the intermediate chamber 26 towards the main outlet 16.

Figures 3 and 4 illustrate yet another example of possible embodiment with the intermediate chamber 26 located downstream of the solenoid valve 10. The operation is reversed compared to Figures 1 and 2. Figure 3 shows the opening of the solenoid valve 10 and Figure 4 shows the closing of the solenoid valve 10. In this embodiment, the chamber 26 is at downstream pressure (main outlet 16) when the solenoid valve 10 is closed and fills to allow opening.

In other words, the intermediate chamber 26 empties when the solenoid valve is closed and fills totally or partially to allow opening. The piston 42 of the main valve 20 separates the intermediate chamber 26 from the main outlet 16 within the enclosure 44. The auxiliary outlet 24 is in the piston 42 and the auxiliary inlet 22 is in the actuating rod 40. Three positions are illustrated in Figure 3 to show the opening of the solenoid valve 10.

According to the left position of Figure 3, the solenoid valve 10 is closed,

Jthe shutter 38 ensuring the seal between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of shuttering the auxiliary inlet

22. The auxiliary outlet 24 is open and puts the intermediate chamber 26 in fluid communication with the main outlet 16. The pressure in the intermediate chamber 16 is the same as downstream of the valve (main outlet 16) and the Upstream pressure (main inlet 14) keeps the valve in the closed position (obturator 38 on the seat of the main passage 18).

According to the middle position of Figure 3, the solenoid valve 10 is always closed, the shutter 38 ensuring sealing between the main inlet 14 and the main outlet 16. The pilot valve 28 is in a state of shutter of the auxiliary outlet 24, requesting the surface 30. The auxiliary inlet 22 is open and puts the intermediate chamber 26 in fluid communication with the main inlet 14 via the conduit 29. The intermediate chamber is being filled from the upstream (main inlet 14) via the actuating rod 40. The pressure of the intermediate chamber 26 increases.

According to the right position of Figure 3, the force exerted by the pressure on the upper surface of the piston 42 facing the intermediate chamber becomes greater than the force exerted by the pressure on the surface of the shutter 38 facing the ''upstream. The pressure in the chamber 26 combined with the action of the pilot valve 28 on the surface 30 makes it possible to move the solenoid valve 10 to the open position. The shutter 38 is no longer on the seat of the main passage 18. The main valve 20 is driven towards the opening position of the main passage 18 with the pilot valve 28 in the shuttered state of the auxiliary outlet 24 and by the pressure which continues to rise in the intermediate chamber 26.

Four positions are illustrated in Figure 4 to show the closing of the solenoid valve 10.

The left position of Figure 4 corresponds to the open position on the right position of Figure 3.

According to the second position in Figure 4, the solenoid valve 10 is always open. The pilot valve 28 is in a state of blocking the auxiliary input 22.

The auxiliary outlet 24 is open and puts the intermediate chamber 26 in fluid communication with the downstream (the main outlet 16). The intermediate chamber 26 is emptying downstream (towards the main outlet 16) through the piston 42. The pressure of the intermediate chamber 26 decreases.

According to the third position of Figure 4, a depressurization of the intermediate chamber 26 occurs through the main valve 20. The pressure of the intermediate chamber 26 has decreased until a pressure equiliore is established on the main valve 20.

According to the fourth position in Figure 4, this balance is exceeded. The upstream pressure (main inlet 14) allows solenoid valve 10 to be placed in the closed position. The main valve 20 is driven towards the position of closing the main passage 18 with the pilot valve 28 in the state of closing the auxiliary inlet 22 and by draining the intermediate chamber 26 towards the main outlet 16.

In the example of Figures 3 and 4, only the opening surface 30 of the main valve 20 is shown; by biasing the surface 30, the pilot valve 28 contributes to actuating the main valve 20 to open. In Figures 3 and 4, surface 32 is not shown by way of example; it is possible to provide the surface 32 in the bore 34 so that by biasing the surface 32, the pilot valve 28 contributes to actuating the main valve 20 to close. Generally speaking in Figures 1-4, the pilot valve 28 has a “T” shape ensuring a mechanical stop with the main valve to be able to operate the latter in the absence of pressure.

The movement of the pilot valve 28 and the main valve 20 are along a common axis, vertical in the figures. In the solenoid valve 10 of the embodiments, the travel of the pilot valve 28 is less than the travel of the main valve 20. More specifically, the axial travel of the pilot valve 28 is less than the axial travel of the main valve 20. The movement of the pilot valve 28 is of an amplitude less than the amplitude of the movement of the main valve 20. This allows the pilot valve 28 to actuate the main valve 20 without the solenoid valve 10 being in a hyperstatic situation. Thus, it is the actuator operating the pilot valve 28 which comes to a stop, even though the main valve 20 does not come to a stop in the body 12. The actuator operating the pilot valve 28 comes to a stop before the eyebolt 42 arrives against the body 12 of the valve, which makes it possible to optimize the actuator. Thus, when the actuator is in the open position, the piston 4, actuating rod 40 and shutter 38 assembly forming the main valve 20 still has the possibility of moving vertically (because of the pressure variation in the cavity for example) between a high position (upper surface of the piston 42 in contact with the body 1 2), and a low position (pilot 28 in contact with the surface 30 of the piston 42. The main valve 20 and the pilot valve 28 can have a spherical shape or elliptical to facilitate self-centering in relation to the element where the sealing must occur, the element being able to be provided with a seat facing it which may be conical. For example, the main passage 18 may be provided. be provided with a conical seat In Figures 1 and 2, the auxiliary outlet 24 can be provided with a conical seat. The same goes for the auxiliary inlet 22 in Figures 2 to 4. The pilot valve 28. may include a ball to ensure at least one of the two seals (with the auxiliary inlet 22 and/or the auxiliary outlet 24). This type of seal consisting of a ball on a formed seat is efficient. In Figure 2, the pilot valve 28 is a ball and ensures sealing with both the auxiliary inlet 22 and the auxiliary outlet 24. In Figure 1, the pilot valve 28 includes a ball to ensure sealing with the auxiliary outlet 24. In Figures 3 and 4, the pilot valve 28 includes a ball to ensure sealing with the auxiliary inlet 22.

By taking advantage of the pressure available in the upstream fluid and managing the pressure in the intermediate chamber 26, the solenoid valve 10 can be autoclaved when closed while not having the upstream pressure to overcome for opening. Thus, the solenoid valve 10 has good sealing and the mass as well as the cost are reduced for a given passage section. Furthermore, controlling such a solenoid valve is simple compared to valves of the prior art and in particular motorized valves. Furthermore, not only does the solenoid valve 10 take advantage of the pressure available in the upstream fluid, but it can also be activated without pressure by the direct action of the pilot valve 28 actuated by the solenoid actuator.

The solenoid valve 10 allows the auxiliary inlet 22 and the auxiliary outlet 24 to be partitioned. Management of the auxiliary inlet 22 (filling channel or conduit)

and the auxiliary outlet 24 (drainage channel or conduit) makes it possible to manage the two flows independently and therefore to allow operation despite the presence of possibly different phases within the fluid.

The pilot valve 28, auxiliary inlet 22 and auxiliary outlet 24 assembly is a three-way system making it possible to manage both the filling route and the emptying route. In Figures 1, 3, 4, the pilot valve assembly 28, auxiliary inlet 22 and auxiliary outlet 24, is radially sealed to be independent of the relative movements of the parts.

In addition, the solenoid valve 10 can operate with a fluid capable of changing phase and with limited dependence on the circuit in which the solenoid valve is integrated - unlike the valves of the prior art which use the pressure available in the flow and which are limited to particular operating cases.

The invention also relates to equipment comprising the solenoid valve 10.

This may be naval aircraft equipment or aerospace equipment such as a space launcher or an aircraft turbomachine powered by hydrogen.

The solenoid valve 10 can be a space valve (launcher, rocket, rocket engine) or a cryogenic valve. Taking into account the management of two-phase aspects within the solenoid valve 10 allows it to be used in the fields of space launchers and cryogenics. The assisted solenoid valve 10 can therefore also operate with cryogenic fuel. It may therefore be cryogenic equipment.

The present invention has been described in relation to specific embodiments, which have purely illustrative value and should not be considered limiting. Generally speaking, it will appear obvious to a person skilled in the art that the present invention is not limited to the examples illustrated and/or described above.

Claims (15)

Claims 1. Solenoid valve (10) comprising: - a body (12) with a main fluid inlet (14), a main fluid outlet (16) and a main passage (18) which connects the main inlet to the main outlet; - a main valve (20) with a shutter (38), the main valve (20) being movable between a position of closing the main passage (18) by the shutter (38) and an opening position of the main passage (18), the main valve comprising an auxiliary fluid inlet (22) in communication with the main inlet and an auxiliary fluid outlet (24) in communication with the main outlet, - an intermediate chamber (26) connecting the inlet auxiliary and the auxiliary output, - a pilot valve (28) movable between a state of closure of the auxiliary input and a state of closure of the auxiliary output and to drive the main valve towards the open position. 2. Solenoid valve (10) according to the preceding claim, in which the pilot valve (28) is further configured to drive the main valve (20) towards the closing position of the main passage (18). 3. Solenoid valve (10) according to one of the preceding claims, in which the pilot valve (28) is configured to drive the main valve (20) - towards the open position by biasing a surface (30) of the valve main or - towards the closing position by biasing another surface (32) of the main valve. 4. Solenoid valve (10) according to one of the preceding claims, in which the pilot valve (28) is in a bore (34) of the main valve (20), the radial movement of the pilot valve in the bore maintaining the seal blocking the auxiliary input (22) or the auxiliary output (24). 5. Solenoid valve (10) according to one of the preceding claims, the axial movement of the pilot valve (28) is less than the axial movement of the main valve (20). 6. Solenoid valve (10) according to one of the preceding claims, capable of receiving the fluid which is propellant in the liquid single-phase state, in the gaseous single-phase state or in the liquid and gaseous two-phase state. 7. Solenoid valve (10) according to one of the preceding claims, further comprising an enclosure (44), the main valve comprising a movable piston in the enclosure and separating the intermediate chamber from the main inlet within the enclosure . 8. Solenoid valve (10) according to the preceding claim, in which the auxiliary inlet is in the piston and the auxiliary outlet is in the actuating rod. 9. Solenoid valve (10) according to one of the two preceding claims, in which the main valve is driven towards the opening position of the main passage with the pilot valve in the state of closing of the auxiliary inlet and by emptying from the intermediate chamber to the main exit. 10. Solenoid valve (10) according to one of claims 1 to 6, further comprising an enclosure (44), the main valve comprising a movable piston in the enclosure and separating the intermediate chamber from the main outlet within the pregnant. 11. Solenoid valve (10) according to the preceding claim, wherein the auxiliary inlet is in the actuating rod and the auxiliary outlet is in the piston. 12. Solenoid valve (10) according to one of the two preceding claims, in which the main valve is driven towards the opening position of the main passage with the pilot valve in the state of closing the auxiliary outlet and by filling with the intermediate room from the main entrance. 13. Solenoid valve (10) according to one of claims 7 to 12, in which the main valve comprises an actuating rod (40) connecting the piston (42) to the shutter. 14. Solenoid valve (10) according to one of the preceding claims, comprising an electromagnetic actuator with a solenoid and a ferromagnetic core actuated by the magnetic flux of the solenoid, the pilot valve being actuated by the core. 15. Equipment with a solenoid valve (10) according to one of the preceding claims, the equipment being aerospace or aeronautical equipment, such as a space launcher or an aircraft turbomachine powered by hydrogen or a space launcher.