An integrated vacuum check valve for an onboard lavatory

Abstract

The application discloses an integrated vacuum check valve for an airborne toilet. It comprises an integrated shell, a pressure sensor, a bypass valve assembly, a solenoid valve assembly, a check valve assembly and a filter screen assembly. The bypass valve assembly is installed on the outboard interface of the upper part of the integrated shell. The check valve assembly is installed in the check valve cavity inside the integrated shell. The solenoid valve assembly is installed on the solenoid valve interface of the side of the integrated shell and is located on the side of the vacuum pump interface. The pressure sensor has two parts. The two pressure sensors are respectively installed on the sensor interface of the side of the integrated shell through screw threads. The filter screen assembly is located inside the integrated shell and is installed on the filter screen assembly interface at the bottom of the integrated shell. The filter screen assembly is located below the check valve assembly. The application can meet the requirements of the vacuum generating system of the airborne toilet to normally switch functions at high and low altitudes. In addition, the application has the advantages of light weight, simple structure, convenient installation and maintenance, high reliability and odor removal.

Description

Technical Field

[0001] This invention relates to the field of aviation technology, and more specifically, it is an integrated vacuum check valve for airborne toilets, and more specifically, it is an integrated vacuum check valve for airborne toilet systems. Background Technology

[0002] Airborne lavatory systems utilize vacuum suction to discharge wastewater. The vacuum generation system within the system is crucial for achieving this function. When the aircraft is on the ground or flying at low altitudes, the vacuum generation system uses an onboard vacuum pump to create a vacuum. At high altitudes, the negative pressure from outside the aircraft is directly introduced into the lavatory system. To achieve this switching of functions, the airborne lavatory system involves numerous functional devices, complex piping and wiring, and a complex installation structure, presenting the following problems:

[0003] (1) Installation space: Airborne toilets are a complex system consisting of numerous devices, pipes and installation structures, but the space available for airborne toilets on aircraft is very small, making installation and maintenance very inconvenient;

[0004] (2) Weight and volume: As aviation equipment, aircraft place very high demands on the weight and volume of airborne toilets, but functional equipment and its piping connections are essential to achieve the relevant functions. Some functional areas of airborne toilets still need to be simplified and integrated;

[0005] (3) In terms of reliability: The more functional equipment a bathroom has, the more complex the connecting pipes and interfaces, the greater the possibility of failure and the lower the reliability.

[0006] (4) Functional aspects: The cabin is an independent airtight space. When passengers use the toilet, the odor from the toilet will spread throughout the cabin, affecting the working environment on board.

[0007] Currently, the vacuum generation system of airborne toilets consists of a vacuum pump, a vacuum check valve, a wastewater tank, and an external connection via piping, with pressure sensors used for system control. This structure involves complex piping connections, occupies a large space, is heavy, inconvenient to install and maintain, has numerous connecting pipes and interfaces, and results in low system reliability.

[0008] Therefore, it is necessary to develop an integrated vacuum check valve for airborne toilets that is easy to connect, occupies little space, is lightweight, is easy to install and maintain, and has high reliability. Summary of the Invention

[0009] The purpose of this invention is to provide an integrated vacuum check valve for airborne toilets. This integrated vacuum check valve not only meets the requirements of the airborne toilet's vacuum generation system to switch between high and low altitudes normally, but also has the advantages of being lightweight, simple in structure, easy to install and maintain, and highly reliable, and has an odor removal function.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows: an integrated vacuum check valve for an airborne toilet, characterized in that it includes an integrated housing, a pressure sensor, a bypass valve assembly, a solenoid valve assembly, a check valve assembly, and a filter assembly;

[0011] An integrated vacuum check valve is installed inside the airborne toilet;

[0012] The integrated housing serves as the outer housing structure for both the bypass valve assembly and the one-way valve assembly, and it is designed with interfaces for the solenoid valve assembly, pressure sensor, filter assembly, wastewater tank, vacuum pump, and external components; wherein,

[0013] The integrated housing has an external interface on the upper part, a filter assembly interface and a wastewater tank interface on the lower part, and a vacuum pump interface, a solenoid valve interface and a sensor interface on the side. The solenoid valve interface and the vacuum pump interface are connected to each other. The two sensor interfaces are arranged opposite each other. One sensor interface is connected to the vacuum pump interface and the external interface. The other sensor interface is connected to the wastewater tank. The wastewater tank interface is located below the filter assembly interface.

[0014] The bypass valve assembly is mounted on the external interface at the top of the integrated housing and is located above the vacuum pump interface;

[0015] The one-way valve assembly is installed inside the one-way valve chamber within the integrated housing and is located below the vacuum pump interface;

[0016] The solenoid valve assembly is mounted on the solenoid valve interface on the side of the integrated housing and is located on the side of the vacuum pump interface;

[0017] There are two pressure sensors, which are respectively installed on the sensor interface on the side of the integrated housing by threads;

[0018] The filter assembly is located inside the integrated housing and is mounted on the filter assembly interface at the bottom of the integrated housing; the filter assembly is located below the one-way valve assembly.

[0019] In the above technical solution, the bypass valve assembly includes a bypass valve housing, a bypass valve spring, a gasket, and a sealing rod;

[0020] The bypass valve spring, gasket, and sealing rod are all mounted on the bypass valve housing; the assembly formed by the above structure is mounted on the corresponding interface on the upper part of the integrated housing to form a bypass valve assembly.

[0021] The bypass valve interface on the upper part of the integrated housing has a frustum-shaped structure, and the lower end of the bypass valve housing has a conical structure.

[0022] The bypass valve housing is located on the frustum-shaped bypass valve port at the top of the integrated housing;

[0023] An external interface is provided on the bypass valve housing;

[0024] The bypass valve housing has a bypass valve hole at the top and a sliding groove in the middle.

[0025] The bypass valve port is connected to the vacuum pump interface and the external interface, respectively.

[0026] The sealing rod has an inverted T-shaped structure; the transverse surface of the sealing rod is located at the cone bottom of the bypass valve interface and above the vacuum pump interface, and the longitudinal surface is slidably connected to the slide groove.

[0027] The bypass valve spring is located on the longitudinal surface of the sealing rod and between the transverse surface of the sealing rod and the slide groove;

[0028] The gasket is located between the lateral surfaces of the bypass valve spring and the sealing rod.

[0029] In the above technical solution, the solenoid valve assembly includes a solenoid valve housing, an armature, a coil, a coil frame, an upper cover plate, and a solenoid valve spring;

[0030] A coil is wound around a coil frame to form a coil assembly, which is then installed inside the solenoid valve housing.

[0031] The top cover plate, armature, and solenoid valve spring are sequentially inserted into the inner hole of the coil frame. The above-mentioned components are installed on the corresponding interface on the side of the integrated housing to form a solenoid valve assembly.

[0032] The solenoid valve housing has a stepped channel inside, and the stepped channel is connected to the vacuum pump interface;

[0033] The armature is located within the stepped channel;

[0034] The solenoid valve spring is located between the inner hole of the coil frame and the armature.

[0035] In the above technical solution, the one-way valve assembly includes a one-way valve spring, a one-way valve core, a one-way valve body, and a one-way valve cavity;

[0036] The one-way valve chamber is connected to the vacuum pump interface;

[0037] The check valve spring, check valve core, and check valve body are all located within the check valve cavity.

[0038] The valve core of the check valve is mounted on the valve body of the check valve;

[0039] The annular groove on the valve body of the one-way valve is filled with rubber. The pointed edge of the valve core of the one-way valve presses against the rubber annular groove on the valve body of the one-way valve to achieve a shut-off seal.

[0040] The check valve spring is mounted on the check valve core and is located between the check valve core and the check valve cavity; the check valve body is threaded onto the integrated housing to form a check valve assembly.

[0041] In the above technical solution, the filter assembly is installed on the bottom interface of the integrated housing and is fixed by a retaining ring to form the filter assembly; the filter assembly includes a filter baffle, a filter support and a filter;

[0042] The filter screen baffle, filter screen support and filter screen are all installed in the filter screen assembly interface to form the filter screen assembly;

[0043] A filter screen baffle is installed at the top of the filter screen bracket, and filters are installed on both sides;

[0044] The filter support has evenly spaced holes on its inner side, and the filter baffle has evenly spaced grooves on its outer ring. Gas containing impurities in the wastewater tank enters from the inner side of the filter support, is filtered by the filter, and flows out from the grooves on the outer ring of the filter baffle to achieve maximum filtration.

[0045] In the above technical solution, an elastic retaining ring for the hole is provided between the bypass valve housing and the integrated housing to limit and fix the bypass valve assembly; an O-ring is provided between the side of the bypass valve housing and the integrated housing to achieve sealing between the integrated housing and the bypass valve assembly.

[0046] An elastic retaining ring is provided between the side end of the top cover plate and the integrated housing to limit and fix the solenoid valve assembly; an O-ring is provided between the side of the coil frame and the integrated housing to achieve a seal between the integrated housing and the solenoid valve assembly.

[0047] An O-ring is provided between the side of the check valve body and the integrated housing to achieve a seal between the integrated housing and the check valve assembly.

[0048] An elastic retaining ring is installed between the wastewater tank interface and the filter assembly interface to limit and fix the filter assembly.

[0049] The present invention has the following advantages:

[0050] This invention integrates bypass valves, check valves, solenoid valves, pressure sensors, and filters into a cohesive whole by combining internal and external installation interfaces and flow channels. This enables the vacuum generation system of the airborne toilet to switch functions normally between high and low altitudes, and can promptly remove odors from the airborne toilet during use. At the same time, it reduces the number of functional devices, shrinks the size and weight, eliminates complex piping connections, simplifies the installation and maintenance of the airborne toilet, and improves its reliability. Attached Figure Description

[0051] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0052] Figure 2 This is a schematic diagram of the internal structure of the invention in left and right cross-sections.

[0053] Figure 3 This is a schematic diagram of the internal structure of the invention in front and rear cross sections.

[0054] Figure 4 This is a schematic diagram of the bypass valve assembly in this invention.

[0055] Figure 5 This is a schematic diagram of the structure of the solenoid valve assembly in this invention.

[0056] Figure 6 This is a schematic diagram of the one-way valve assembly in this invention.

[0057] Figure 7 This is a schematic diagram of the filter assembly in this invention.

[0058] exist Figure 7 In the diagram, A represents the opening on the side of the inner hole of the filter support; B represents the groove on the outer ring of the filter baffle.

[0059] In the diagram, 1-integrated housing, 2-pressure sensor, 3-bypass valve assembly, 3.1-bypass valve housing, 3.11-slide groove, 3.12-bypass valve orifice, 3.2-bypass valve spring, 3.3-gasket, 3.4-sealing rod, 4-solenoid valve assembly, 4.1-solenoid valve spring, 4.2-solenoid valve housing, 4.3-armature, 4.4-coil, 4.5-coil frame, 4.6-top cover plate, 5-one-way valve assembly, 5.1-one-way valve spring, 5.2-one-way valve core, 5.3-one-way valve body, 6-filter assembly, 6.1-filter baffle, 6.2-filter support, 6.3-filter, 7-wastewater tank interface, 8-vacuum pump interface, 9-external interface, 9.1-conical structure, 10-O-ring seal, 11-elastic retaining ring for the hole. Detailed Implementation

[0060] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, these descriptions do not constitute a limitation of the present invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0061] refer to Figure 1 , Figure 2 and Figure 3 An integrated vacuum check valve for airborne toilets includes an integrated housing 1, a bypass valve assembly 3, a check valve assembly 5, a solenoid valve assembly 4, a pressure sensor 2, and a filter assembly 6. It has three interfaces: a wastewater tank interface 7, a vacuum pump interface 8, and an external interface 9. The integrated vacuum check valve is installed inside the airborne toilet and connects to the vacuum pump, wastewater tank, and external interface via piping to form a vacuum generation system, providing vacuum suction functionality for the airborne toilet.

[0062] In this embodiment, the integrated housing 1 is designed with mounting interfaces for the bypass valve assembly 3, the one-way valve assembly 5, the solenoid valve assembly 4, the pressure sensor 2, and the filter assembly 6, and also includes a wastewater tank interface 7, a vacuum pump interface 8, and an external interface 9. The integrated housing 1 has internal flow channels designed to achieve logical connections between the various functional components.

[0063] refer to Figure 4 The bypass valve assembly 3 in this embodiment includes a bypass valve housing 3.1, a bypass valve spring 3.2, a gasket 3.3, a sealing rod 3.4, an O-ring seal 10, and an elastic retaining ring 3.6 for the bore. The bypass valve spring 3.2, gasket 3.3, and sealing rod 3.4 are sequentially mounted on the bypass valve housing 3.1, and the resulting assembly is mounted on the corresponding interface on the upper part of the integrated housing 1, forming the bypass valve assembly 3. The elastic retaining ring 3.6 for the bore is installed on the integrated housing 1 to limit and fix the bypass valve assembly 3, and the O-ring seal 10 is installed on the integrated housing 1 to achieve a seal between the integrated housing 1 and the bypass valve assembly 3. The working principle of the bypass valve assembly is as follows: the sealing rod 3.4 is made of soft rubber. When the upper air pressure is greater than the lower air pressure, the sealing rod 3.4 is pressed against the conical surface of the integrated housing 1 to achieve shut-off; when the lower air pressure is greater than the upper air pressure, the sealing rod 3.4 is blown up by the air pressure to achieve open-off. This achieves a one-way conduction function.

[0064] An external interface 9 is provided on the bypass valve housing 3.1.

[0065] refer to Figure 5In this embodiment, the solenoid valve assembly 4 includes an O-ring seal 10, a solenoid valve housing 4.2, an armature 4.3, a coil 4.4, a coil frame 4.5, a retaining ring 4.6 for the bore, a top cover plate 4.6, and a solenoid valve spring 4.1. The coil 4.4 is wound around the coil frame 4.5 to form a coil assembly, which is then installed on the solenoid valve housing 4.2. The top cover plate 4.6, the armature 4.3, and the solenoid valve spring 4.2 are sequentially inserted into the inner hole of the coil frame 4.5. The assembly is then installed on the corresponding interface on the side of the integrated housing 1 to form the solenoid valve assembly 4. The retaining ring 4.6 for the bore is installed on the integrated housing 1 to limit and fix the solenoid valve assembly 4; the O-ring seal 10 is installed on the integrated housing 1 to achieve a seal between the integrated housing 1 and the solenoid valve assembly 4. The working principle of the solenoid valve assembly is as follows: when the coil 4.4 is energized, the armature 4.3 is attracted and pressed against the upper cover plate 4.6, and the solenoid valve opens; when the coil 4.4 is de-energized, the armature 4.3 is reset under the action of the solenoid valve spring 8, and the solenoid valve closes.

[0066] refer to Figure 6 In this embodiment, the one-way valve assembly 5 includes a one-way valve spring 5.1, a one-way valve core 5.2, a one-way valve body 5.3, and an O-ring seal 10. The one-way valve spring 5.1, the one-way valve core 5.2, and the O-ring seal 10 are sequentially mounted on the one-way valve body 5.3, and the resulting assembly is threaded onto the integrated housing 1, forming the one-way valve assembly 5. The annular groove on the one-way valve body 5.3 is filled with rubber to achieve a sealing connection between the one-way valve core 5.2 and the one-way valve body 5.3. An O-ring seal is installed on the one-way valve body 5.3 to achieve a seal between the integrated housing 1 and the one-way valve assembly 5. The working principle of the one-way valve assembly is as follows: when the upper air pressure is greater than the lower air pressure, the one-way valve core 5.2 is pressed against the rubber ring of the one-way valve body 5.3, thus closing the one-way valve; when the lower air pressure is greater than the upper air pressure, the one-way valve core 5.2 is lifted by the air pressure, thus opening the one-way valve. This achieves the one-way conduction function.

[0067] refer to Figure 7 The filter assembly 6 in this embodiment includes a filter baffle 6.1, a filter support 6.2, a filter 6.3, and an elastic retaining ring 6.4 for the holes. The filter baffle 6.1, filter 6.3, and filter support 6.2 are sequentially mounted on the integrated housing 1 to form the filter assembly 6. The elastic retaining ring 6.4 for the holes is installed on the integrated housing 1 to limit and fix the solenoid valve assembly 4. The filter support 6.2 has evenly spaced holes on its inner side, and the filter baffle 6.1 has evenly spaced holes near its outer edge. The working principle of the filter assembly is as follows: Figure 7 As indicated by the middle arrow, air containing impurities enters from the wastewater tank interface 7, enters the filter screen through the inner side of the filter screen support 6.2 for filtration, and enters the internal flow channel of the integrated housing 1 through the outer edge hole of the filter screen baffle 6.1.

[0068] The working principle of the integrated vacuum check valve in this embodiment is as follows:

[0069] refer to Figure 1 Vacuum pump interface 8 connects to the negative pressure inlet of the vacuum pump, and the positive pressure outlet of the vacuum pump connects to external interface 9. Since the inlet and outlet of the vacuum pump are interconnected, vacuum pump interface 8 can be considered as being connected to external interface 9. (Reference) Figure 2 The left pressure sensor 2 is connected to the inside of the wastewater tank to monitor the pressure inside the wastewater tank; the right pressure sensor 2 is connected to the vacuum pump interface 8 to monitor the pressure outside the machine.

[0070] When the aircraft is on the ground or flying at low altitude, the left-side pressure sensor 2 monitors the pressure inside the wastewater tank in real time. When the pressure difference between the wastewater tank and the cabin air pressure is less than 30 kPa, the vacuum pump starts, the one-way valve assembly 5 opens, and the bypass valve assembly 3 closes. Air in the wastewater tank is drawn out by the vacuum pump through the filter screen 6.3, creating negative pressure. When the pressure difference is greater than 30 kPa, the vacuum pump shuts off, the one-way valve assembly 5 closes, and the negative pressure inside the wastewater tank is maintained. The right-side pressure sensor 2 monitors the external pressure in real time. When the lavatory is in use, the solenoid valve assembly 4 opens. When the pressure difference between the external and cabin air pressures is less than 20 kPa, the vacuum pump starts, drawing out the odor escaping from the onboard lavatory through the solenoid valve assembly 4.

[0071] When the aircraft is flying at high altitude, the external interface 9 is in a negative pressure environment. The bypass valve assembly 3 and the one-way valve assembly 5 are open, and the external negative pressure is automatically introduced into the wastewater tank through the wastewater tank interface 7. The left pressure sensor 2 monitors in real time whether the pressure difference between the wastewater tank pressure and the cabin air pressure is greater than 30 kPa. When it is greater than 30 kPa, the vacuum pump does not need to be started; otherwise, the vacuum pump is started. When using the lavatory, the solenoid valve assembly 4 is open, and the right pressure sensor 2 monitors whether the pressure difference between the external pressure and the cabin air pressure is greater than 20 kPa. When it is greater than 20 kPa, the vacuum pump does not need to be started, and the odor escaping from the onboard lavatory is automatically drawn out of the aircraft through the solenoid valve assembly 4; otherwise, the vacuum pump is started.

[0072] This invention mainly adopts an integrated structure, integrating solenoid valves, one-way valves, bypass valves, pressure sensors, and filter structures into one unit. This enables the vacuum generation system of the airborne toilet to switch normally between high and low altitudes, and can promptly remove odors from the airborne toilet during use. At the same time, it reduces the number of functional devices, shrinks the size, reduces the weight, eliminates complex piping connections, simplifies the installation and maintenance of the airborne toilet, and improves the reliability of the airborne toilet.

[0073] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the structure of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

[0074] All other unspecified parts belong to the prior art.

Claims

1. An integrated vacuum check valve for use in airborne toilets, characterized in that: It includes an integrated housing (1), a pressure sensor (2), a bypass valve assembly (3), a solenoid valve assembly (4), a check valve assembly (5), and a filter assembly (6); The bypass valve assembly (3) is mounted on the external interface (9) on the upper part of the integrated housing (1) and is located above the vacuum pump interface (8); The one-way valve assembly (5) is installed inside the one-way valve cavity inside the integrated housing (1) and is located below the vacuum pump interface (8); The solenoid valve assembly (4) is mounted on the solenoid valve interface on the side of the integrated housing (1) and is located on the side of the vacuum pump interface (8); There are two pressure sensors (2), and the two pressure sensors (2) are respectively installed on the sensor interface on the side of the integrated housing (1) by threads; The filter assembly (6) is located inside the integrated housing (1) and is installed on the filter assembly interface at the bottom of the integrated housing (1); the filter assembly (6) is located below the one-way valve assembly (5); The vacuum pump interface (8) is connected to the negative pressure inlet of the vacuum pump, and the positive pressure outlet of the vacuum pump is connected to the external interface (9).

2. The integrated vacuum check valve for an airborne toilet according to claim 1, characterized in that: The bypass valve assembly (3) includes a bypass valve housing (3.1), a bypass valve spring (3.2), a gasket (3.3), and a sealing rod (3.4); The bypass valve interface on the upper part of the integrated housing (1) has a frustoconical structure, and the lower end of the bypass valve housing (3.1) is provided with a conical structure (9.1); The bypass valve housing (3.1) is located on the bypass valve port with a frustum-shaped structure at the upper part of the integrated housing (1); An external interface (9) is provided on the bypass valve housing (3.1); The bypass valve housing (3.1) has a bypass valve hole at the top and a slide groove (3.11) in the middle; The bypass valve port is connected to the vacuum pump interface (8) and the external interface (9) respectively; The sealing rod (3.4) has an inverted T-shaped structure; the transverse surface of the sealing rod (3.4) is located at the cone bottom of the bypass valve interface and above the vacuum pump interface (8), and the longitudinal surface is slidably connected to the slide groove (3.11); The bypass valve spring (3.2) is located on the longitudinal surface of the sealing rod (3.4) and between the transverse surface of the sealing rod (3.4) and the slide groove (3.11); The gasket (3.3) is located between the transverse surfaces of the bypass valve spring (3.2) and the sealing rod (3.4).

3. The integrated vacuum check valve for an airborne toilet according to claim 1 or 2, characterized in that: The solenoid valve assembly (4) includes a solenoid valve housing (4.2), an armature (4.3), a coil (4.4), a coil frame (4.5), an upper cover plate (4.6), and a solenoid valve spring (4.1); A coil (4.4) is wound around a coil frame (4.5) to form a coil assembly, which is installed inside the solenoid valve housing (4.2); The top cover plate (4.6), armature (4.3), and solenoid valve spring (4.1) are sequentially inserted into the inner hole of the coil frame (4.5); The solenoid valve housing (4.2) has a stepped channel inside, and the stepped channel is connected to the vacuum pump interface (8); The armature (4.3) is located within the stepped passageway; The solenoid valve spring (4.1) is located between the inner hole of the coil frame (4.5) and the armature (4.3).

4. The integrated vacuum check valve for an airborne toilet according to claim 3, characterized in that: The one-way valve assembly (5) includes a one-way valve spring (5.1), a one-way valve core (5.2), a one-way valve body (5.3), and a one-way valve cavity; The one-way valve chamber is connected to the vacuum pump interface (8); The check valve spring (5.1), check valve core (5.2), and check valve body (5.3) are all located within the check valve cavity; The check valve core (5.2) is mounted on the check valve body (5.3); The annular groove on the valve body (5.3) of the check valve is filled with rubber, and the pointed edge of the valve core (5.2) of the check valve presses against the rubber annular groove on the valve body (5.3); The check valve spring (5.1) is mounted on the check valve core (5.2) and is located between the check valve core (5.2) and the check valve cavity.

5. The integrated vacuum check valve for an airborne toilet according to claim 4, characterized in that: The filter assembly (6) includes a filter baffle (6.1), a filter support (6.2), and a filter (6.3); The filter baffle (6.1), filter support (6.2), and filter (6.3) are all installed inside the filter assembly interface; A filter screen baffle (6.1) is provided at the upper end of the filter screen bracket (6.2), and filter screens (6.3) are provided on both sides respectively; The filter support (6.2) has uniformly open holes on its inner side, and the filter baffle (6.1) has uniformly grooved outer ring.

6. The integrated vacuum check valve for an airborne toilet according to claim 5, characterized in that: An elastic retaining ring (11) and an O-ring seal (10) are provided between the bypass valve housing (3.1) and the integrated housing (1); An elastic retaining ring (11) for holes is provided between the top cover plate (4.6) and the integrated housing (1); an O-ring (10) is provided between the coil frame (4.5) and the integrated housing (1); An O-ring (10) is provided between the valve body (5.3) of the one-way valve and the integrated housing (1); The filter assembly interface is located above the wastewater tank interface (7); an elastic retaining ring (11) for the hole is provided between the wastewater tank interface (7) and the filter assembly interface.

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