Device for flushing and/or for testing the pressure and tightness of pipes, in particular of drinking water and/or heating systems

0001The invention relates to a device for flushing and for testing the pressure and tightness of pipes in drinking water and/or heating systems.

0002Analogue and digital pressure testers are known with which lines can be tested for pressure and tightness. For this purpose, the devices are equipped with hand pumps with which a certain pressure can be applied. The regulations prescribe ever higher pressures for the pressure and leak test. However, such pressures can no longer be generated with hand pumps. For this reason, it is necessary to use electric pumps in addition to the devices, which not only require an additional, expensive device, but also complicate the testing process due to the cumbersome handling.

0003Even if the pressure and leak test is carried out with water, additional equipment is required to achieve the required high test pressure.

0004In the case of drinking water pipes in particular, it is stipulated that these must be flushed and, if necessary, also disinfected. Additional devices are required for this.

0005The pamphlet<patcit id="pcit0001" dnum="CA2639600A1"><text>CA-A1-2 639 600</text></patcit> discloses a device for checking valves, the device having a line with a water connection, an air connection and an outlet for connection to the valves to be checked. There is a valve in each of the water connection and the air connection.

0006The invention is based on the object of designing the generic device in such a way that it can be used to carry out the necessary flushing and/or testing of the line systems in a cost-effective and simple manner.

0007This object is achieved according to the invention with the features of claim 1 in the case of the generic device.

0008The device preferably has at least one pressure generator, which is arranged on the base frame and can apply the high pressure required for the test according to EN 806-4. The device is equipped with a compressor and/or a pump for this purpose. The required test pressure can be generated with these pressure generators. Therefore, no additional devices are required in addition to the device according to the invention. The craftsman can therefore easily carry out the necessary tests of the line systems. The pressure generator can be used for the pressure test with air or for the pressure test with water.

0009In the configuration according to the invention, the device has at least one water line which is provided with a connection for the water network and with an outlet to which a hose can be connected, for example, which connects the device to the line system to be tested. At least one compressed air line, via which compressed air can be supplied, opens into the water line. This makes it possible to introduce a water-compressed air mixture into the line system. This procedure is used when flushing the pipe systems. Since the switching valve is located in the compressed air line, access of the compressed air to the water line can be released or blocked as required. It is therefore possible with the device to flush the lines either with water alone or with a mixture of water and compressed air. The switching valve is advantageously a 3 /2-way valve.

0010When the switching valve is open, the compressed air can be supplied continuously or else in pulses. The user of the device according to the invention thus has the possibility, depending on the existing conditions, of selecting the most favorable rinsing method with and without compressed air, with the compressed air also being able to be supplied continuously or in pulses.

0011At least one compressor is located in the compressed air line, with which the compressed air pressure required for the respective application can be easily generated.

0012At least one compressed air tank is advantageously connected downstream of the compressor. This ensures that a sufficient amount of compressed air is available as soon as the device is switched on. With the compressor, the compressed air tank can be refilled with compressed air in a simple manner.

0013Another compressed air line is connected to the switching valve. It is provided with a connection to which the line system to be tested can be connected with a hose or similar. A pressure test with compressed air is therefore possible via this connection. In the other compressed air line sits another switching valve with which the other compressed air line can be opened or blocked, depending on the test to be carried out by the user of the device.

0014The further switching valve advantageously forms a changeover switch for a pressure test with air or with liquid, preferably with water. Depending on the switching position of this additional switching valve, the user of the device can select the medium required for the test.

0015The further switching valve is preferably a 3/2-way valve.

0016In an advantageous embodiment of the device, an air supply line is connected to the further switching valve, which in turn connects this further switching valve to a pressure generator for the liquid medium. Depending on the switching position of the other switching valve, the device can be switched from a pressure test with air to a pressure test with liquid, in particular water.

0017In a further embodiment, the compressed air tank is formed by a base frame of the base frame of the device according to the invention. The base frame is correspondingly hollow and pressure-tight. A separate container to be attached to the base frame, which would require additional installation space, is therefore not required as a compressed air container. The base frame is already provided on the device, so that no additional installation space is required. As a result, the device according to the invention can be made very compact.

0018The base frame is advantageously mirror-symmetrical to the longitudinal center plane of the base frame. This design of the base frame enables the various components of the device to be mounted in a space-saving manner and contributes to a compact design. In addition, this design allows the center of gravity of the device to be set favorably.

0019In a preferred embodiment, the base frame has two U-shaped frame parts which are arranged upright and merge into one another by two horizontal frame parts. The U-shaped frame parts are advantageously provided opposite one another on the device. The legs of these frame parts advantageously extend downwards, so that the horizontal frame parts are arranged in the lower area of ​​the device. This training contributes to a favorable low center of gravity of the device, making the handling of the device is much easier. The base frame with the frame parts can be produced very easily because tubes can be used as the starting material, which can be easily bent into the desired shape and then connected to one another in a pressure-tight manner in a suitable manner, for example by a welding process. The U-shaped frame parts are advantageously bent in such a way that they have a part of the horizontal frame parts. The horizontal frame parts of the two U-shaped frame parts are welded together, resulting in the base frame.

0020A floor is advantageously fastened to the horizontal frame parts of the base frame. The various components and units of the device can be mounted on it. The base frame thus not only has the function of a compressed air tank, but also serves as a supporting frame with which the components mounted on the floor and/or on the base frame are carried.

0021In an advantageous embodiment, a standing partition wall is arranged on the floor. With it, it is possible to create two adjacent installation spaces in the device, in which the respective components or units can be installed. The partition wall can be designed in such a way that it optimally shields the components on one side and on the other side from one another, so that these components cannot influence one another. For example, the dividing wall can be designed as a heat protection wall, which ensures that the heat generated by individual units during operation of the device is dissipated in such a way that other components are not affected by the heat. For example, the device can be constructed in such a way that the heat-insensitive components are located on one side of the partition wall, while the heat-generating components, such as the compressor or the pump, are arranged on the other side. The partition wall is also suitable as a mounting wall to which the components of the device can be attached.

0022The switching valves are advantageously connected to a controller. With the control, the switching valves can be switched by the operator to the desired extent.

0023So that simple input is possible, the device is advantageously provided with at least one control panel, which is provided with input elements for inputting data and/or commands into the controller. The user can make the necessary entries for the respective application on the control panel. For example, he can set the device for a flushing process or for a pressure and leak test.

0024The device can also have a connection for an air-powered tool. This connection is advantageously connected to the compressed air tank. As a result, the user of the device has the option not only of flushing or checking the line systems, but also of carrying out any installation work associated with the laying of lines using appropriate tools operated by compressed air.

0025The device according to the invention enables the user to carry out a wide variety of functions, for which only the single device is necessary and additional devices are not required.

0026Further features of the invention emerge from the further claims, the description and the drawings.

0027The invention is explained in more detail with reference to an embodiment shown in the drawings. Show it<dl id="dl0001"><dt>1</dt><dd>a perspective view of a device according to the invention,</dd><dt>2</dt><dd>according to the device according to the invention<figref idref="f0001">1</figref> in a different perspective view,</dd><dt>3</dt><dd>in a perspective view of a base frame of the device according to<figref idref="f0001">figures 1</figref> and<figref idref="f0002">2</figref>,</dd><dt>4</dt><dd>a hydropneumatic circuit diagram of the device according to the invention.</dd></dl>

0028The device described below has the maximum configuration with which it is possible to carry out the following device functions:<ol id="ol0001" ol-style=""><li>1. Flushing drinking water and heating systems with water.</li><li>2. Flushing drinking water and heating systems with water and constant compressed air.</li><li>3. Flushing drinking water and heating systems with water and compressed air pulses.</li><li>4. Disinfection and preservation of drinking water and heating systems.</li><li>5. Pressure and leak testing of drinking water and heating systems with compressed air.</li><li>6. Driving compressed air tools.</li><li>7. Inflating containers of all kinds (air pump).</li><li>8th. Pressure and leak testing of drinking water and heating systems with water.</li></ol>

0029The device gives the user the ability to perform the eight functions listed above without requiring additional devices. However, the device can also be equipped in such a way that only function 5 or function 8 or both functions 5 and 8 can be performed with it. It is also possible to equip the device in such a way that it can perform functions 1 to 7. In the maximum configuration, the device can perform all functions 1 to 8.

0030The device has a base frame 1 (<figref idref="f0003">3</figref>), which has two parallel frame parts 2, 3. The two frame parts 2, 3 go at both ends curved in an arc in upward frame parts 4, 5; 6, 7 over. The frame parts 4 to 7 run parallel to one another and perpendicular to the two lower frame parts 2, 3. At the upper end, the frame parts 4, 6 curve into a frame part 8 and the frame parts 5, 7 curve into a frame part 9. The two frame parts 8, 9 are parallel to each other and advantageously at the same height. Due to the design described, the base frame 1 is formed on the two long sides of the device by the U-shaped mutually lying frame parts 2, 4, 5 and 3, 6, 7, which are connected to each other by the upper frame part 9, 8. These U-shaped frame areas are characterized in that the frame parts 4, 5 and 6, 7 run upwards from the lower frame part 2, 3.

0031On the two narrow sides of the device, the base frame 1 is formed by the frame parts 4, 6, 8 and 5, 7, 9 arranged in a U-shape, the frame parts 4, 6 and 5, 7 extending downwards from the upper frame part 8, 9 extend. The U-shaped frame parts are made from two tubes. They are bent in such a way that the U-shaped frame parts 4, 6, 8 and 5, 7, 9 still have part of the horizontal frame parts 2, 3. The frame parts bent in this way are placed together with the horizontal sections and welded together in a pressure-tight manner. The horizontal sections form the frame parts 2, 3 of the base frame 1. The weld, which is advantageously located halfway along the frame parts 2, 3, is in<figref idref="f0003">3</figref> indicated by a dashed line.

0032Due to the design of the base frame 1 described, the device has a high rigidity.

0033A floor 10, which is preferably formed by a plate, is fastened between the two lower frame parts 2, 3. In the area between the two frame parts 2, 3 there is a partition wall 11 which extends perpendicularly to the floor 10 and is fastened to it. The partition wall 11 is also advantageously formed by a plate which, in the exemplary embodiment, has a rectangular outline and extends over the entire length of the floor 10 . The upward narrow sides 12, 13 of the partition 11 are each angled. The narrow side 12 is angled in a U-shape. The opposite narrow side 13 is only bent at right angles. The shape of these narrow sides 12, 13 depends on those units that are to be mounted on the floor 10 and/or on the partition wall 11.

0034To stiffen the base frame 1, the two frame parts 4, 6 are connected to one another by a cross brace 14, which is located at a small distance below the frame part 8. The opposite vertical frame parts 5, 7 are connected to one another at a small distance below the frame part 9 by a cross brace 15. In the illustrated embodiment, the two crossbars 14, 15 are at the same height, but can also be provided at different heights, depending on the design of the device. The partition wall 11 can vary in height depending on the structure of the device. In the illustrated embodiment, the upper edge of the partition wall 11 is at a distance in the area below the cross braces 14, 15, viewed in the longitudinal direction of the frame parts 2, 3.

0035The base frame 1 not only has a support and carrying function for the device and the units, but also serves as a compressed air tank. Accordingly, the frame parts 2 to 9 are formed by tubes which are connected to one another in a pressure-tight manner. Therefore, no separate container for the compressed air is required, so that the device can be made compact overall.

0036According to the hydropneumatic circuit diagram<figref idref="f0004">4</figref> First the structure of the device is explained. It has a water connection 16 via which the device can be connected to the water supply. In the water line 17 adjoining the water connection 16 there is a pressure sensor 18 , which is followed by a water meter 19 and a check valve 20 in the water line 17 . The check valve 20 prevents the water from flowing back towards the water connection 16 . The water line 17 has an outlet 21 through which the water enters the water lines of the respective installation that are to be rinsed and/or tested. The outlet 21, like the water connection 16, is designed as a coupling, so that a simple connection to the water network or to the installation water lines, if necessary using pieces of hose, is possible. The water line 17 runs, as can be seen from the<figref idref="f0001">1</figref> and<figref idref="f0002">2</figref> results, essentially horizontally through the device. The water connection 16 is located in the area between the upper frame part 8 and the crossbar 14. The outlet 21 on the opposite side of the device is located between the upper frame part 9 and the crossbar 15. To enable easy connection, the water connection 16 protrudes and/or the outlet 21 slightly outwards. Since the water connection 16 and the outlet 21 are close to the upper frame parts 8, 9, the user of the device can easily reach these connections.

0037If the line system of the respective installation is to be flushed with water, the device is connected to the water supply via the water connection 16. The connection to the lines of the installation is established via the outlet 21 . The pipelines of the installation can then be flushed with water. The water pressure required for flushing the pipes can be reliably determined via the pressure sensor 18 . The amount of water flowing through can be reliably determined with the aid of the water meter 19 .

0038The lines can be drinking water and/or heating lines that are flushed with water. In general, all lines with gaseous or liquid media can be flushed or checked with the device, e.g. gas lines, conveyor lines and the like.

0039With regard to the flushing, the pressure test and the leak test, regulations must be observed, in particular EN 806-4.

0040The device can also be used for rinsing with water and a constant supply of compressed air. For this purpose, the device is provided with a compressor 22 which is fastened upright on the floor 10 . A compressed air line 23 is connected to the compressor 22, which connects the compressor 22 to the compressed air tank 1, which is formed by the base frame of the device. A check valve 24 closing against the compressor 22 is located in the compressed air line 23 between the compressor 22 and the compressed air tank 1. A supply line 25 is connected to the compressed air tank 1, which connects the compressed air tank 1 to a connection 26 for a compressed air tool. The fitter can thus optionally connect compressed air tools to connection 26, as are often used in sanitary installations. A pressure reducer 27 is seated in the supply line 25, with which the pressure can be adjusted to that for the compressed air tool connected to the connection 26. To monitor the reduced pressure, a manometer 28 is advantageously installed in the supply line 25 between the connection 26 and the pressure reducer 27. As shown in FIG<figref idref="f0001">1</figref> shows, the manometer 28 is easily readable in the area between the two frame parts 4 and 5 of the base frame 1. The pressure reducer 27 is also provided in this area next to the manometer 28 (<figref idref="f0001">1</figref>).

0041In the area between the compressed air tank 1 and the pressure reducer 27 there is a pressure switch 29 in the supply line 25, which serves as an emergency stop in case of danger, with which the compressor 22 can be switched off. How<figref idref="f0001">1</figref> shows, the pressure switch 29 is located in an easily accessible place on the device in the area between the two upper frame parts 8 and 9.

0042The compressed air line 23 opens into the water line 17 and is secured against this by a non-return valve 30 . It prevents water from entering the compressed air line 23 from the water line 17 . Downstream of the compressed air tank 1 is a filter 31 which filters out impurities from the compressed air flowing through the compressed air line 23 . In the compressed air line 23 sits behind the filter 31, a pressure regulator 32, with which the passage of compressed air to the water line 17 can be controlled. In<figref idref="f0004">4</figref> the pressure regulator 32 is in its blocking position, so that no compressed air can get into the water line 17 .

0043Downstream of the pressure regulator 32 is a pressure sensor 33 which switches the pressure regulator 34 on. In the exemplary embodiment, the pressure sensor 33 is designed for a pressure range of up to approximately 10 bar. Excessive pressure in the compressed air line can be reduced with the pressure regulator 34 . In<figref idref="f0004">4</figref> the pressure regulator 34 is in its blocking position, so that when the compressed air line 23 is released by the pressure regulator 32, the pressure is not reduced. If the pressure of the compressed air rises above a predetermined value, the pressure regulator 34 is adjusted to its open position, so that an excessive pressure in the compressed air line 23 can be reduced accordingly. The pressure regulator 34 is switched automatically via a corresponding control, so that it is ensured that when the pressure regulator 32 is open, the compressed air is introduced into the water line 17 at the prescribed pressure.

0044Between the pressure regulator 34 and the check valve 30 sits in the compressed air line 23, a switching valve 35, which is advantageously a 3/2-way valve. It is in the representation according to<figref idref="f0004">4</figref> in open position.

0045If the installation connected to the outlet 21 of the device is to be flushed with a mixture of water and compressed air, then the pressure regulator 32 is set to the open position, so that the compressed air reaches the water line 17 via the line 23 . The connection of the compressed air line 23 to the water line 17 is in the area between the check valve 20 and the outlet 21. The pressure sensor 33 in conjunction with the pressure regulator 34 ensures that the compressed air reaches the water line 17 at the required pressure. The pressurized air can be fed into the water line 17 continuously or in pulses, depending on the flushing process desired.

0046The device also offers the possibility of examining the lines of the installation by means of a pressure test with air. Module 36 is provided for this (<figref idref="f0004">4</figref>). It has a compressed air line 39 which is provided with a compressed air connection 37 . The compressed air line 39 can be connected to an air supply line 41 via a directional control valve 40 . In the exemplary embodiment, the directional valve 40 is a 3/2-way valve. With the directional valve 40, the device can be switched from a pressure test with air to a pressure test with water.

0047The air supply pipe 41 is connected to a pump 42 which is a hydropneumatic pump with which water can be pumped from a water pipe 43 . The water line 43 has a connection 44 via which the device can be connected to the water supply. The water line 43 is secured by a check valve 45 against the water network.

0048With the hydropneumatic pump 42, the water is fed to an outlet 46, via which the device can be connected to the lines of the installation to be tested, for example via a pressure hose.

0049In the water line 43 the hydropneumatic pump 42 is followed by a check valve 47 which closes against the hydropneumatic pump 42 .

0050The output 46 is preceded by a pressure sensor 48 which switches a pressure regulator 49 . The pressure sensor 48 is designed for a pressure range of up to about 40 bar, for example. With the pressure sensor 48, the pressure of the water in the water line 43 can be kept at a predetermined value. If the water pressure is too high, then the pressure regulator 49 is switched so that the water pressure can be reduced via the now open pressure regulator 49 . As soon as the water pressure reaches the required value intended for the test, the pressure regulator 49 is returned to its in<figref idref="f0004">4</figref> shown blocking position adjusted.

0051The check valve 47 is followed by a safety valve 50, which opens when a maximum pressure in the water line 43 is exceeded, so that the pressure can be reduced. In<figref idref="f0004">4</figref> the safety valve 50 is shown in the closed position. Between the safety valve 50 and the pressure sensor 48 and the pressure regulator 49 there is a check valve 51 which closes in the direction of the safety valve 50 .

0052The water pipe 43 with the hydropneumatic pump 42, the pressure sensor 48, the pressure regulator 49 and the safety valve 50 form a module 52 with which a water pressure test of the pipes of the installation can be carried out.

0053The air supply line 41 is connected to the hydropneumatic pump 42 and can be connected to a compressed air line 53 via the directional control valve 40 . It is connected to the directional control valve 35 and has a directional control valve 54, which is advantageously a solenoid valve. The compressed air line 53 is secured by a safety valve 55, which opens when a predetermined pressure is exceeded. In the exemplary embodiment, the safety valve 55 is designed in such a way that it opens when a pressure of 1.8 bar is exceeded. Of course, this pressure value is not to be considered as limiting.

0054A pressure sensor 56 is located in the compressed air line 53 between the safety valve 55 and the directional control valve 54 and is designed for a pressure range of up to approximately 200 mbar in the exemplary embodiment.

0055The directional valve 54, the safety valve 55, the pressure sensor 56 and the compressed air connection 37 are part of the module 36, with which a pressure test with air of the line system of the installation can be carried out. In the exemplary embodiment, the module 36 is designed in such a way that it can be used for a pressure test with air at 150 mbar or at 3 bar. In addition, it is advantageously possible to mix in a disinfectant via the compressed air connection 37 . The compressed air connection 37 can also be used to inflate containers of all kinds (air pump). The pressure can be set via the pressure sensor 33 and the pressure regulator 32.

0056The air supply line 41 is connected to the compressed air line 53 in the area between the directional control valve 35 and the directional control valve 54 .

0057In the position after<figref idref="f0004">4</figref> the directional control valve 54 is in its closed position. The directional control valve 40 is switched in such a way that the compressed air line 39 is connected to the compressed air line 53 . However, the directional control valve 35 is switched in such a way that the compressed air line 53 is not connected to the compressed air line 23 . The air supply line 41 is blocked off from the compressed air line 53 by the directional control valve 40 . Since the pressure regulator 32 is in the blocked position, the compressed air line 23 is blocked from the water line 17 . In this switching state, the device is connected to the water mains via the water connection 16. The line system of the installation to be flushed is connected to the outlet 21 via a hose. By opening a tap (not shown), the water line 17 is released, so that the water from the water network enters the line system of the installation, which is thereby flushed through to the required extent. The line system can in particular be a drinking water or heating system. In the case of a drinking water installation, the flushing process must be flushed with drinking water as soon as possible after installation and a pressure test and immediately before commissioning (EN 806-4). The test specifications stipulate that flushing must be carried out at regular intervals (up to 7 days) if the pipe system is not put into operation immediately after commissioning. With the device, it is easy and reliable to carry out this necessary rinsing process.

0058According to EN 806-4, it is also possible to flush the pipe system of the installation with a water-air mixture. In order to make this possible, the pressure regulator 32 is moved from the blocking to the open position. This allows the compressed air from the compressed air tank 1 to reach the water line 17 via the filter 31 and the directional control valve 35 . A water-air mixture thus flows out of the outlet 21, with which the line system of the installation is flushed. In this case, the compressed air can be supplied continuously. However, it is also possible to introduce compressed air into the water in the water pipe 17 in a pulsed manner. The pulses of compressed air can be generated, for example, by repeatedly opening and closing the pressure regulator 32 at time intervals.

0059With the device it is also possible to disinfect the pipe system. The disinfectant is in a container that is connected to the outlet 37. A T-coupling piece can be connected to the outlet 37 for this purpose. The connection for the compressed air line 39 is in the T-foot of the T-piece. The disinfection container is connected to the T-foot. The T-bar is connected at one end to the outlet 37 and at the other end to the plumbing of the installation. The directional valve 35 is from the in<figref idref="f0004">4</figref> The position shown is switched so that the compressed air coming from the compressed air tank 1 reaches the connection 37 via the compressed air line 23, the switched directional control valve 35, the compressed air line 53, the directional control valve 40 and the compressed air line 39.

0060The device can also be used to carry out a pressure and leak test of the installation's drinking water and heating systems using compressed air. Such a test is specified in the ZVSHK leaflet T 82-2011 "Leak tests of drinking water installations with compressed air, inert gas or water". Here it is stipulated that a preliminary test with 150 mbar be carried out first. Certain test times are prescribed for this preliminary test. This is followed by a load test (main test) in which the pressure is increased to 3 bar, for example. This test method can also be carried out in a simple manner with the device. For the pressure test with air, a compressed air hose is connected to the compressed air connection 37, which in turn is connected to the line system of the installation. The directional valve 35 is from the position according to<figref idref="f0004">4</figref> switched so that the compressed air from the compressor 22 or from the compressed air tank 1 via the line 23 and the switched directional control valve 35 and the directional control valve 40, the position according to<figref idref="f0004">4</figref> occupies, enters the compressed air line 39. For the preliminary test with the low pressure (150 mbar), the directional control valve 54 is moved from the position according to<figref idref="f0004">4</figref> switched. The required low pressure is detected by the pressure sensor 56 and the pressure controller 34 is regulated accordingly. The pressure regulator 34 ensures that when this pre-test pressure is exceeded, the pressure is reduced accordingly. The downstream safety valve 55 protects the pressure sensor 56.

0061After the preliminary test has been carried out within the prescribed test time, the directional control valve 54 is switched to the in<figref idref="f0004">4</figref> shown position switched back. As a result, the necessary higher test pressure (up to eg 3 bar) can now be provided at the compressed air outlet 37 . The pressure sensor 33 is designed for this pressure range, so that it is ensured that the compressed air reaches the line system via the compressed air outlet 37 at the required test pressure. If the test pressure is exceeded, the pressure is reduced accordingly via the pressure regulator 34 .

0062Finally, the device can also be used to carry out a pressure and leak test on drinking water. The corresponding regulations for this can be found in EN 806-4:2010 and ZVSHK leaflet T 82-2011. Depending on the type of pipe system (metal pipes, plastic pipes, multi-layer composite pipes and the like), different test conditions are provided.

0063The pressure test with water is carried out using module 52. Connection 44 is used to connect to the water network. The hydropneumatic pump 42 conveys the water via the water pipe 43 to the outlet 46, via which the device is connected to the pipe system of the installation. The directional control valves 35 and 40 are in accordance with the position<figref idref="f0004">4</figref> switched over, so that the compressed air from the compressor 22 or from the compressed air tank 1 via the compressed air lines 23, 53 enters the air supply line 41. The hydropneumatic pump 42 is accordingly supplied with the necessary compressed air to generate the necessary water pressure.

0064The test pressure required for the pressure test with water is thus available at the outlet 46 . The pressure sensor 48 in conjunction with the pressure regulator 49 ensure that when the test pressure is exceeded by opening the pressure regulator 49, the pressure is reduced accordingly.

0065All rinsing, disinfection and pressure/leak tests of pipe systems can be carried out with the described device in the maximum configuration. No separate devices are therefore required for the individual functions. This is a great relief for the user, since he can carry out the most diverse functions with one and the same device. With the device, the user has all the options at the construction site to carry out the various processes as required. The various valves are switched by means of software which can be actuated by the user via a control panel 57 of a control panel 58 . He is guided through the program under menu control, with the individual settings being shown clearly on a display 59 . The control panel 57 has input elements with which the user can reliably make the necessary settings. The control panel 58 is located in the upper area of ​​the device (<figref idref="f0002">2</figref>) and is inclined so that the operator can easily operate the control panel 57 and easily observe the display 59.

0066The individual components of the device are arranged on both sides of the partition wall 11, resulting in a very compact and low construction of the device. The compressor 22, the pressure reducer 27, the manometer 28 and the pressure switch 29 are arranged on one side of the partition wall 11 (<figref idref="f0001">1</figref>). On the opposite side of the partition wall 11 are the pressure regulators 32, 34, 49 and the directional control valves 35, 40. The pressure regulator and directional control valve are arranged one above the other to save space (<figref idref="f0002">2</figref>). In this case, these components are arranged adjacent to the frame part 6 . The hydropneumatic pump 42, the filter 31, the pressure sensor 48 and the control panel 58 are also located on this side of the partition wall 11.

0067Due to the distribution of the various components on both sides of the partition wall 11, the weight is evenly distributed, so that the device can be driven comfortably by the user. Corresponding wheels or rollers 60 are mounted on the base frame 1 in the area of ​​the frame parts 4, 6 so that they can rotate freely. In the area of ​​the opposite frame parts 5, 7, the frame parts 2, 3 have feet 61 on the underside, which give the device a secure footing while working. So that the device can be moved comfortably, it is provided with a swivel bracket 62 (<figref idref="f0001">1</figref> and<figref idref="f0003">3</figref>), whose mutually parallel legs 63, 64 are mounted at the free end so as to be freely pivotable about horizontal axes 67. In the in the<figref idref="f0001">Fig.1</figref> and<figref idref="f0003">3</figref> In the rest position shown, the legs 63, 64 are directed downwards from the pivot axes 65, so that they take up little space. To move the device, the bracket 62 is grasped at the web 66, which connects the two legs 63, 64 to one another. It is advantageously formed in one piece with the legs 63, 64. The bracket 62 is pivoted up about the horizontal pivot axes 65 on the web 66 . The pivot axes 65 are mounted in a U-shaped bearing piece 67 which is attached to the outside of the frame parts 5,7. The bearing pieces 67 are provided in such a way that the legs 63, 64 strike the webs 68 of the bearing pieces 67 when the bracket 62 is pivoted up. As a result, the pivoting path of the bracket 62 is limited in a simple manner.

0068The bearing pieces 67 are located approximately at the level of the connection areas of the cross strut 15 to the two frame parts 5, 7. The two cross struts 14, 15 are on the frame parts 4, 6; 5, 7 attached so that they protrude slightly beyond this to the outside. They therefore offer impact protection if the device should hit a wall, a table and the like while driving, for example. The cross braces 14, 15 thereby protect the base frame 1 and/or the components of the device.

0069The base frame 1 is designed in such a way that it can accommodate the quantities of compressed air required for testing purposes. For example, the capacity of the base frame 1 is chosen so that it can hold 5 liters of compressed air. Depending on the application, the base frame 1 can also be designed for a larger or smaller amount of compressed air. Since no separate compressed air tank is required for the compressed air tank, the described design of the base frame 1 as a compressed air tank contributes particularly to the compact design of the device, which has a low center of gravity due to the described design.