SYSTEM WITH TEST CONNECTION FOR TESTING FLUID-CONDUCTING COMPONENTS

Description

[0001] The invention relates to a system with a test connection for testing fluid-carrying components, in particular fluid-carrying fittings and / or fluid-carrying hoses, wherein a component to be tested can be connected to the test connection with an opening, wherein a predetermined negative pressure can be generated in the component by means of a negative pressure device, and wherein a predetermined test pressure can be generated in the component by means of a pressure device.

[0002] For example, fire departments require various fluid-carrying components, particularly water-carrying fittings and water-carrying hoses, to transport water from a water intake point to the source of a fire. Depending on the intended use, fire engines are specially equipped for this purpose and fitted with different components. Water-carrying components are subject to regular testing. Since fire departments often lack extensive logistical resources, particularly without their own testing facility, it is often necessary to send the components to be tested to appropriate testing workshops.

[0003] Water-carrying fittings and components, for example, must be tested as part of a suction test and a pressure test. During a suction test, a predetermined negative pressure is created in the component using a vacuum device so that the component can be tested for leaks and proper internal condition. During a pressure test, a predetermined test pressure is created in the component and, in turn, its leaks and proper mechanical condition are checked. To carry out such suction and pressure tests, test connections are known to which the fluid-carrying components are connected via one of their fluid-carrying openings. For a suction test, for example, the test connection must close the connected opening in the component to prevent air from entering so that a vacuum pump connected to another end of the component can create a negative pressure in the component.If the component is to be pressure tested subsequently, it must generally be disconnected from the test connection and connected to another test connection that seals the connected opening in the component to prevent any test fluid, such as water, from escaping. This allows the test fluid for the pressure test to be introduced into the component under high pressure via a pressure pump connected to another opening in the component. This procedure is associated with considerable effort, particularly since both a suction test and a pressure test must be carried out on the component on a regular basis. A further problem is the necessary venting of the component before the test fluid for the pressure test is introduced. This venting must regularly be carried out manually, which creates additional effort.

[0004] CN 111578014 A discloses a pressure-limiting valve designed for use in oil pipelines. The valve is designed as an automatically opening and closing bidirectional valve used to reduce the risk of leaks in oil pipelines. The valve automatically closes the oil passage if a set pressure is exceeded upstream or downstream of the valve.

[0005] US 20150300510 A1 describes a hydraulic valve for preventing leakage in a drive for actuating a high-voltage or medium-voltage circuit breaker. The hydraulic valve for connecting a first fluid-carrying pressure line to a second fluid-carrying pressure line in a drive for actuating a high-voltage or medium-voltage circuit breaker comprises a housing with a first channel inlet for connection to the first pressure line and with a second channel inlet for connection to the second pressure line, as well as with a cavity located between the first and second channel inlets.The hydraulic valve further comprises a closure body movable in the cavity, the circumference of which is larger at least at one point than the respective circumference of the opening of the first and second channel inlets adjacent to the cavity, wherein the closure body is geometrically adapted to the cross-section of these openings such that it completely closes them when seated. The hydraulic valve also includes a first spring element fastened in the first channel opening, which is connected to the closure body on a first side thereof and projects into the cavity in the relaxed state, and a second spring element fastened in the second channel opening, which is connected to the closure body on a second side thereof and projects into the cavity in the relaxed state.

[0006] CN 113483954 A discloses a water immersion device for automotive exhaust pipes, which is used to test the airtightness of exhaust pipes. The device comprises a water immersion chamber for immersing an exhaust pipe and a first and a second plug block for connecting two ends of the exhaust pipe. The exhaust pipe is pressurized, and air leakage can be observed by the formation of bubbles in the immersion bath.

[0007] DE 102013010093 A1 describes a device for testing pipelines or hoses, in particular fire hoses, for leaks, comprising a pressure pump which is connected to a liquid reservoir via a first suction line and from which a pressure line leads to at least one pipeline to be tested and / or at least one hose to be tested, wherein an injector is arranged in the pressure line, which is connected to the liquid reservoir via a second suction line and which automatically sucks liquid from the liquid reservoir via the second suction line up to a limit pressure prevailing in the pressure line and feeds it into the pressure line.

[0008] DE 69706725 T2 describes a heat exchanger, in particular a steam generator for pressurized water nuclear reactors, in which a leak in the heat exchanger's piping system can be detected during operation. The heat exchanger tubes terminate in a plate above a water box divided into two chambers by an inner wall. Each chamber contains two identical testing devices mounted on remote-controlled operating arms. With the aid of a video camera, a first water injection head is inserted into the corresponding tube end and secured there by a flexible element that is hydraulically deformed. Water is introduced, and an air purge piston moves to the other end of the tube, where it is stopped just outside by a second injection head. The second injection head is then inserted and secured, and by successive water additions and pressure measurements, any leak can be found.

[0009] KR 20100126117 A discloses a system for detecting defects in pipelines, comprising a self-driving vehicle and a remote control device. The self-driving vehicle enters a circular pipeline and inspects the interior of the circular pipeline. The remote control device provides a user interface. The measurement data measured by a sensor and the image data measured by a camera are displayed in the display areas of the user interface.

[0010] Based on the explained prior art, the object of the invention is to provide a test connection of the type mentioned at the outset, with which a suction and pressure test of a fluid-carrying component is possible in a simple and reliable manner.

[0011] The invention solves the problem by the subject matter of independent claim 1. Advantageous embodiments can be found in the dependent claims, the description and the figures.

[0012] For a test connection of the type mentioned at the outset, the invention solves the problem in that the test connection has a test valve that can be switched between a first switching position and a second switching position, so that the negative pressure can be generated successively in the component by means of the negative pressure device and the test pressure can be generated successively in the component by means of the pressure device when the component is connected to the test connection.

[0013] The fluid-carrying components to be tested at the test connection can, in particular, be fluid-carrying fittings and / or fluid-carrying hoses. The components can be fluid-carrying, preferably water-carrying. They can be firefighting components used by fire departments. Examples of components include suction hoses, standpipes, jet pipes, pressure relief valves, distributors, lifting bags, and other water-carrying fittings and system separators.

[0014] The test connection has a connection section for connecting a component to be tested to an opening that carries fluid during operation. The connection section can be designed in any way, depending on the connection options available for the components to be tested. For example, in Germany, so-called Storz couplings are often used to connect components and thus also as the connection section of the test connection. They are used in firefighting, particularly by fire departments or water hydrants. They are non-blocking, symmetrical hermaphrodite couplings with a bayonet lock.

[0015] For the pressure test to be carried out at the test connection, a pressure device is used to generate a predetermined test pressure in the component to be tested. For the suction test, a vacuum device is used to generate a predetermined negative pressure in the component to be tested. The pressure device comprises a pump, preferably a hydraulic pump, with which a test fluid, in particular a test liquid such as test water, can be pumped into the component. For this purpose, the pressure device can be connected in particular to a second opening in the component. By pumping in the test fluid, the predetermined test pressure is generated in the component and the component is thus tested for pressure resistance and leak tightness in the prescribed manner. A test pressure is conceivable, for example, at a level of 5 bar or more than 5 bar, for example more than 10 bar, in particular more than 20 bar.

[0016] The vacuum device also comprises a pump, preferably a hydraulic pump, in particular a vacuum pump, with which a predetermined negative pressure, i.e. a pressure lower than ambient pressure, can be generated in the component to be tested. The pump of the vacuum device can again be connected to a second opening in the component. By pumping out the air contained in the component, a predetermined negative pressure is generated in the component, thus conducting a suction test, for example of a suction hose. Once the predetermined negative pressure is reached in the component, a visual inspection of the internal condition of the component, for example of a suction hose, can be carried out.

[0017] As explained at the beginning, for the suction test, the opening in the component connected to the test connection must be closed against the ingress of air from the environment so that the specified negative pressure can be generated in the component. As also explained at the beginning, for the pressure test, the opening in the component connected to the test connection must be sealed against the escape of the test fluid introduced into the component, in particular the test liquid such as water, so that the specified test pressure can be generated in the component. The test connection according to the invention has a test valve that can be switched between a first switching position and a second switching position. This switchable test valve makes it possible to carry out a suction test by generating a negative pressure in the component and a pressure test by generating a test pressure in the component one after the other and without recoupling the component.The component can remain connected to the test port during these different test types. The test valve can be switched between the first and second positions, allowing either the suction test or the pressure test to be performed, depending on the switch position. For example, in the first switch position, the vacuum could be generated in the component using the vacuum device, and in the second switch position, the test pressure could be generated in the component using the pressure device.

[0018] Since the component does not have to be removed from the test connection between these two test procedures, and in particular no manual intervention at the test connection is required, the regularly required performance of a suction test and a pressure test is considerably simplified.

[0019] In the first switching position, the test valve can close the test connection to prevent air from entering the component connected to the test connection while the negative pressure is being generated in the component. Furthermore, in the second switching position, the test valve can close the test connection to prevent test fluid from escaping from the component connected to the test connection while the test pressure is being generated in the component. As explained, during the suction test, a negative pressure is generated in the component by pumping out any air present in the component. In this case, it must be prevented that air is drawn into the component through the test connection. The test valve of the test connection according to the invention ensures this by closing the test connection, and thus the connected opening of the component, to prevent air from entering the component while the negative pressure is being generated.In a pressure test, however, a test pressure is generated in the component, usually by introducing a test fluid, such as a test liquid, especially water, under high pressure until the specified test pressure is reached in the component. In doing so, it must be prevented that test fluid can escape from the component through the test connection and thus through the connected opening in the component. This is ensured by the test valve, which, in the second switching position, closes the test connection to prevent test fluid from escaping from the component. Air may escape, particularly at the beginning of the pressure test, as explained in more detail below.

[0020] According to one embodiment, the test valve can be switched between the first switching position and the second switching position by means of a control device, electrically, hydraulically, or pneumatically controlled. The test connection can also comprise the control device. The test valve controlled by the control device can, for example, be a double-seat valve or it can comprise two valves that can be selectively controlled, so that, for example, one of the valves closes against the ingress of air for a suction test and a second of the valves closes against the escape of a test fluid for a pressure test. The control of the test valve can also comprise check valves for the control.

[0021] According to a further embodiment, the test valve can be mechanically switchable between the first switching position and the second switching position by generating the negative pressure and the test pressure. The advantage of this embodiment is that no separate control or control device, nor any corresponding control components, such as electrical, hydraulic, or pneumatic lines or control lines, are required. Rather, the test valve is automatically adjusted to the required switching position when the negative pressure or the test pressure is applied. This results in a particularly simple and robust design and ease of use.

[0022] According to a further embodiment, it can be provided that the test valve has a valve housing connected to the test connection, said valve housing having a first valve seat and a second valve seat, and a valve element movable in an axial direction in the valve housing. In the first switching position of the test valve, the valve element bears against the first valve seat with a first sealing section, such that the first sealing section seals the valve housing against the ingress of air. In the second switching position of the test valve, the valve element bears against the second valve seat with a second sealing section, such that the second sealing section seals the valve housing against the escape of a test fluid. Sealing the valve housing also seals the test connection and thus the connected opening of the component.

[0023] The valve element can be moved axially between the first switching position and the second switching position in a particularly preferred manner by generating the negative pressure and the test pressure. For example, when the negative pressure is applied, the valve element is pulled into the first switching position by the generated negative pressure, in which position its sealing element rests against the first valve seat and further suction of air from the environment is reliably prevented. If, after completion of the suction test, a test pressure is built up in the component by introducing a test fluid into the component, the valve element is now pressed axially by the introduced test fluid into the second switching position, in which position its second sealing element rests against the second valve seat and further leakage of test fluid from the component is prevented.This design realizes the automatic switching of the test valve between the first and second switching positions without the need for manual intervention in a particularly simple and reliable manner.

[0024] The valve element can have a valve rod mounted for axial movement, on which the first and second sealing sections are arranged. The first and second sealing sections comprise a first and second seal, respectively. According to a particularly practical embodiment, the first and second sealing sections can be formed by a first and second sealing ring, preferably a first and second rubber ring, or a first and second sealing plate, preferably a first and second rubber plate.

[0025] According to a further embodiment, the valve element can be preloaded by a preloading element, preferably a preloading spring, into a third position located between the first and second switching positions, in which position air or test fluid can pass through the valve housing. The preloading element or preloading spring can be supported on the one hand on the valve element, for example a flange section of the valve rod, and on the other hand on an opposite surface of the valve housing, in particular on the side of the second valve seat. This embodiment prevents the test valve from blocking the passage through the test connection even without the application of an external force.

[0026] According to a further embodiment in this regard, it can be provided that the preload is designed such that the valve element is held in the third position by the preload during venting of a component connected to the test connection by generating a venting pressure in the component that is lower than the test pressure, and is moved into the second switching position against the preload of the preload element by generating the higher test pressure. At the start of a pressure test, i.e. at the start of the introduction of a test fluid to build up the specified test pressure, there is usually air inside the component that must be displaced by the test fluid, for example the test liquid such as water, for the pressure test. If the test valve were to block the test connection against the passage of air in a rest position before the start of the pressure test, this necessary venting via the test connection would not be possible.As explained, the third position of the test valve between the first and second switching positions, achieved by the preload element, enables the passage of air, in particular for venting the component at the start of a pressure test. The preload provided by the preload element is sufficiently large that the valve element is held in the third position at the pressures applied during venting, which are generally lower than the test pressure. If the pressure in the component, and thus the pressure on the valve element, continues to rise as the test fluid is introduced, the preload force of the preload element is exceeded, so that the valve element is now pushed from the third position, for example, into the second switching position, in which it rests against the second valve seat with the second sealing element and thus reliably prevents the test fluid from escaping via the test connection for the further pressure test.The aforementioned design enables automatic venting during the build-up of the test pressure in the component without the need for manual intervention.

[0027] The test connection can also have a viewing window for a visual inspection of the interior of a component connected to the test connection. The viewing window can be made of glass or a plastic, such as acrylic glass, for example. It can be integrated into the connection section of the test connection and, for example, surround a valve housing of the test connection. The viewing window has sufficient mechanical properties to withstand the test pressure or negative pressure generated in the component at all times. The internal condition of the component, for example a suction hose, can be inspected through the viewing window, for example during a negative pressure test.

[0028] According to a further embodiment, the test connection can further comprise a camera that records the interior of a component connected to the test connection. The camera can, for example, be integrated into the connection section of the test connection. The camera image of the interior of the component can be transmitted to a display unit, for example, a smartphone, a tablet, a laptop, a PC, or a user interface of a testing system. In this way, the condition of the component's interior can be easily monitored even at a location separate from the component. Furthermore, this solution allows for comprehensive documentation of the visual inspection.

[0029] According to a further embodiment, the test connection can further comprise a light source that illuminates the interior of a component connected to the test connection. Such a light source, which can also be integrated, for example, into a connection section of the test connection, facilitates the inspection of the condition of the component's interior.

[0030] The invention also relates to a system comprising a test connection according to the invention, a vacuum device for generating a predetermined vacuum in a component to be tested, and a pressure device for generating a predetermined test pressure in the component to be tested. The system can also comprise the component to be tested, wherein the component can be one of the aforementioned components, for example, a suction hose.

[0031] The invention also achieves the object by using a system according to the invention for combined suction and pressure testing of a component to be tested, in particular a suction hose, which is connected to the test connection, wherein, when the component is connected to the test connection, a negative pressure is generated in the component by means of the negative pressure device for a suction test and a test pressure is generated by means of the pressure device for a pressure test, in particular without the component having to be detached from the test connection in between, and in particular without any manual intervention being required.To control the pressure test and suction test, the system may comprise a control device so that after connecting the component to be tested to the test connection, the combined suction and pressure test at the test connection can be carried out automatically without further manual intervention, in particular by controlling corresponding pumps and valves assigned to them.

[0032] An embodiment of the invention is explained in more detail below with reference to the figures. They show schematically: Figure 1 shows a test connection according to the invention with the component to be tested connected therein in a partially sectioned view according to a first embodiment, Figure 2 shows an enlarged detail of the Figure 1 shown test connection, and Figure 3 shows a test connection according to the invention with the component to be tested connected therein according to a second embodiment.

[0033] Unless otherwise stated, the same reference symbols in the figures refer to the same objects.

[0034] In Figure 1A fluid-carrying component 10 to be tested, in this case a suction hose 10, is connected to a connection section 12 of a test connection according to the invention. The connection section 12 can, for example, comprise a Storz coupling, to which the suction hose 10 is coupled with a first opening 14. The connection section 12 comprises a central bore 16 formed by a central cylindrical section 18. An annular viewing window 22, for example made of acrylic glass, is held between the cylindrical section 18 and an outer cylindrical ring section 20. Through this viewing window 22, the interior of the suction hose 10 can be inspected, for example during a suction test. The first opening 14 connected to the test connection is formed in a first coupling section 24 of the suction hose 10, which can accordingly form a Storz coupling.At its opposite end, the suction hose 10 has a second coupling section 26, which forms a second opening 28. To perform a suction test, air contained in the suction hose 10 is sucked out by means of a pump connected to the second coupling section 26, in particular a vacuum pump, in order to generate a predetermined negative pressure in the suction hose 10. For a pressure test of the suction hose 10, a test fluid, for example a test liquid such as water, is pumped into the interior of the suction hose 10 via a pump connected to the second coupling section 26 until a predetermined test pressure is reached in the suction hose 10. The pumps can be selectively connected to the coupling section 26 and the second opening 28 via corresponding valves. The selective connection can be controlled by a control device.

[0035] In order to prevent air from the environment from being sucked into the suction hose 10 via the central bore 16 during the suction test and to prevent test fluid from escaping from the interior of the suction hose 10 into the environment via the central bore 16 during the pressure test, the test connection has a test valve 30. The test valve 30 is in Figure 2shown enlarged. The test valve 30 comprises a valve housing 32 with a through opening 34 aligned with the central bore 16, in which a valve rod 36 is mounted for axial movement. The valve housing 32 can be formed integrally with the cylindrical portion 18 or form a separate component which is connected to the cylindrical portion 18 in a suitable manner. A lower inner surface 38 of the valve housing 32 forms a first valve seat and an opposite inner surface 40 of the valve housing 32 forms a second valve seat. The valve rod 36 has a flange 42, on the Figure 2 lower side a first sealing section 44 and on its Figure 2upper side, a second sealing section 46 is arranged. The sealing sections 44, 46 are designed as sealing rings 44, 46 and can be, for example, rubber rings 44, 46. By means of a very schematically illustrated pretensioning spring 48, the valve rod 36 and with it the sealing sections 44, 46 are Figures 1 and 2 shown third position. From this third position, the valve rod 36 can be Figure 2 be moved axially downwards until the first sealing ring 44 lies sealingly against the first valve seat 38 and thus closes the through-opening 34 and thus the test connection against the ingress of air from the environment into the interior of the suction hose 10. Furthermore, the valve rod 36 can be moved from the Figure 2 shown third position in Figure 2be moved axially upwards against the pretension of the pretension spring 48 until the second sealing ring 46 lies sealingly against the second valve seat 40 and the through opening 34 and thus the test connection is tightly sealed against the escape of test fluid from the interior of the suction hose 10 into the environment.

[0036] It should be noted that directions mentioned in the drawings, such as top, bottom, left, and right, refer exclusively to the representation in the drawings. It is understood that the arrangement of the test connection, the suction hose 10, and the other components could, of course, also be oriented differently than shown in the figures.

[0037] The following describes the function of the Figures 1 and 2 The initial position of the valve rod 36 is the position shown in the Figures 1 and 2shown third position, in which air or a test fluid can pass through the through-opening 34, for example from the environment into the interior of the suction hose 10 or from the interior of the suction hose 10 into the environment. If, for example, a suction test of the suction hose 10 is to be carried out in a first step, the air in the suction hose 10 is pumped out via the second opening 28 by a pump, in particular a vacuum pump, connected to the second coupling section 26. The resulting negative pressure causes the valve rod 36 to be moved from the Figures 1 and 2 shown third position in Figure 2pulled axially downward into the first switching position, in which the sealing ring 44 rests tightly against the first valve seat 38, so that no further air from the environment can enter the interior of the component 10 through the through-opening 34. The specified negative pressure can now be generated in the component 10 for the suction test. During this time, the internal condition of the suction hose 10 can be checked, for example, via the viewing window 22.

[0038] If, for example, a pressure test of the suction hose 10 is to be carried out in a second test step, a test fluid, such as a test liquid, in particular water, is pumped into the interior of the suction hose 10 via a pump connected to the second coupling section 26. For this purpose, the vacuum pump can be automatically separated from the second coupling section 26 by closing a corresponding valve, for example, and the pump for the pressure test can be connected to the second coupling section 26 by opening a corresponding valve. At this time, there is usually still air in the suction hose 10, which must be displaced by the incoming test fluid. After completion of the suction test and the corresponding reduction of the negative pressure, the valve rod 36 can either still be in the first switching position or already back in the Figure 2In the first case, the relatively low pressure inside the suction hose 10 during venting causes the valve rod 36 to initially move into the position shown in Figure 2 shown third position, or it is already in this third position anyway. The preload provided by the preload spring 48 is sufficient to hold the valve rod 36 in the third position during the relatively low pressure built up during venting, so that the air inside the suction hose 10 can escape into the environment via the through-opening 34. With increasing entry of the test fluid, the pressure inside the suction hose 10 increases until the preload of the preload spring 48 is exceeded and the valve rod 36 is pressed into the second switching position, in Figure 2axially upward until the second sealing ring 46 rests tightly against the second sealing seat 40. From this point on, the test fluid introduced into the interior of the suction hose 10 cannot escape into the environment. By further introducing the test fluid, the specified test pressure can be generated in the suction hose 10. This allows a combined suction and pressure test without manual intervention at the test connection and without the need to reconnect the suction hose 10.

[0039] In Figure 3 A further embodiment of a test connection according to the invention is shown. This differs from the one shown in the Figures 1 and 2shown test connection only in that a controllable, in this case electrically controllable, test valve 50 is provided instead of the test valve 30. A control device 52 controls the test valve 50 between the first switching position and the second switching position and preferably also into a third position for venting the suction hose 10 before a pressure test. The control device 52 can also control the vacuum device and the pressure device for carrying out the combined suction and pressure test or corresponding valves for selectively connecting the pumps to the second coupling section 26. In the Figure 3In the exemplary embodiment shown, a camera 54 is also provided, which records the interior of the suction hose 10 and transmits the camera images, for example, to the control device 52 and / or a display unit. In this way, for example, during a suction test, the interior of the suction hose 10 can be recorded with the camera 54. The camera 54 is preferably also controlled by the control device 52. In addition, in the Figure 3 In the embodiment shown, a light source 56, for example, an LED light source 56, is provided to illuminate the interior of the suction hose 10. In this way, the interior of the suction hose 10 can be better monitored, for example, during the suction test. The light source 56 can also be controlled by the control device 52.

[0040] Of course, the embodiment according to Figure 3 a viewing window 22 is possible, as described above for the Figures 1 and 2was shown, in particular for a possible additional manual visual inspection of the interior of the suction hose 10. In the same way, the camera 54 and / or the light source 56 in the embodiment according to the Figures 1 and 2 be provided, as well as the control device 52.

[0041] It is further pointed out that with reference to the Figures 1 to 3 The description is based on an exemplary component 10 in the form of a suction hose 10. Of course, other components 10 to be tested could also be provided. LIST OF REFERENCE SYMBOLS 10 suction hose 50 test valve 12 Connection section 52 Control device 14 first opening 54 camera 16 central hole 56 light source 18 cylindrical section 20 cylindrical ring section 22 Viewing window 24 first coupling section 26 second coupling section 28 second opening 30 test valve 32 valve housing 34 passage opening 36 valve rod 38 first valve seat 40 second valve seat 42 flange 44 first sealing section 46 second sealing section 48 Preload spring

Claims

1. A system comprising a negative-pressure apparatus for generating a specified negative pressure in a component (10) to be tested and a pressure apparatus for generating a specified test pressure in the component (10) to be tested as well as a test connection for testing the fluid-conducting component (10), in particular a fluid-conducting fitting and / or a fluid-conducting hose, wherein a component (10) to be tested can be connected to the test connection by an opening (14), wherein a specified negative pressure can be generated in the component (10) by means of the negative-pressure apparatus, and wherein a specified test pressure can be generated in the component (10) by means of the pressure apparatus, wherein the test connection has a test valve (30, 50) that can be switched between a first switching position and a second switching position, such that the negative pressure can be generated by means of the negative-pressure apparatus and the test pressure can be generated by means of the pressure apparatus one after the other in the component (10) in the state of the component (10) connected to the test connection.

2. The system according to claim 1, characterized in that the test valve (30, 50), in the first switching position, closes the test connection against an ingress of air into the component (10) connected to the test connection when the negative pressure is generated in the component (10), and wherein the test valve (30, 50), in the second switching position, closes the test connection against an egress of a test fluid from the component (10) connected to the test connection when the test pressure is generated in the component (10).

3. The system according to any one of claims 1 or 2, characterized in that the test valve (50) can be switched between the first switching position and the second switching position in an electrically or hydraulically or pneumatically controlled manner.

4. The system according to any one of claims 1 or 2, characterized in that the test valve (30) can be mechanically switched between the first switching position and the second switching position by generating the negative pressure and the test pressure.

5. The system according to any one of the preceding claims, characterized in that the test valve (30, 50) has a valve housing (32) connected to the test connection and comprising a first valve seat (38) and a second valve seat (40), and has a valve element (36) that can be moved in an axial direction in the valve housing (32), in that the valve element (36) rests against the first valve seat (38) by a first sealing portion (44) in the first switching position of the test valve (30, 50), such that the first sealing portion (44) seals the valve housing (32) against an ingress of air, and in that the valve element (36) rests against the second valve seat (40) by a second sealing portion (46) in the second switching position of the test valve (30, 50), such that the second sealing portion (46) seals the valve housing (32) against an egress of a test fluid.

6. The system according to claim 5, characterized in that the valve element (36) can be moved axially between the first switching position and the second switching position by generating the negative pressure and the test pressure.

7. The system according to any one of claims 5 or 6, characterized in that the valve element (36) has a valve rod (36) which is mounted so as to be movable in the axial direction and on which the first and second sealing portion (44, 46) are arranged.

8. The system according to any one of claims 5 to 7, characterized in that the first and second sealing portion (44, 46) are formed by a first and second sealing ring (44, 46), preferably a first and second rubber ring (44, 46), or by a first and second sealing plate, preferably a first and second rubber plate.

9. The system according to any one of claims 5 to 8, characterized in that the valve element (36) is biased into a third position located between the first and second switching position by means of a biasing element (48), preferably a biasing spring (48), in which third position a passage of air or test fluid through the valve housing (32) is possible.

10. The system according to claim 9, characterized in that the biasing is designed such that the valve element (36) is held in the third position by means of the biasing of the biasing element (48) when a component (10) connected to the test connection is vented by generating a venting pressure in the component (10) that is less than the test pressure, and is moved into the second switching position by generating the higher test pressure against the biasing of the biasing element (48).

11. The system according to any one of the preceding claims, characterized in that it further has a viewing window (22) for a visual inspection of the interior of a component (10) connected to the test connection.

12. The system according to any one of the preceding claims, characterized in that it further has a camera (54) that records the interior of a component (10) connected to the test connection.

13. The system according to any one of the preceding claims, characterized in that it further has a light source (56) that illuminates the interior of a component (10) connected to the test connection.

14. A use of a system according to any one of the preceding claims for combined suction and pressure testing of the component (10), in particular a suction hose (10), to be tested that is connected to the test connection, wherein a negative pressure is generated by means of the negative-pressure apparatus for a suction test and a test pressure is generated by means of the pressure apparatus for a pressure test one after the other in the component (10) in the state of the component (10) connected to the test connection.