Check valve with venting device

Description

[0001] The present invention relates to a check valve suitable for use in a mobile or stationary toilet, e.g., as an odor trap, and to a toilet with the check valve. The check valve is characterized by its simple design and effectively prevents backflow of fluid and the escape of odors. The check valve is characterized by an integrated venting device, which is preferably low-noise and prevents fluid flow in the blocking direction of the check valve.

[0002] Preferably, the check valve according to the invention is arranged so that liquid can flow from a toilet bowl through the check valve into a collecting container, wherein the check valve seals the transition in a liquid-tight and preferably odor-tight manner.

[0003] It is well known that check valves with built-in cones are used to prevent backflow of liquids. These have the disadvantage that a separate venting device must be installed, otherwise a constant-volume collecting tank downstream of the check valve would build up excess pressure, making it difficult for further fluid to flow.

[0004] Known check valves are disclosed in US2017122445A1, WO2016123331A1 and US2017121953A1.

[0005] In particular, US2017122445A1 discloses a drain valve having a housing defining a drain conduit for the passage of fluids to be drained, the drain conduit having a first edge defining an inlet to the drain conduit opposite a second edge defining an outlet from the drain conduit. One or more check valves are located within the drain conduit between the first edge and the second edge and have a closed configuration and an open configuration configured to allow the flow of fluids through the outlet of the drain conduit. A vent conduit extends within the drain conduit and internally includes a lower valve seat, an upper valve seat, and a bypass valve positioned between the lower valve seat and the upper valve seat.The bypass valve is designed to allow gas to bypass the one or more check valves and escape to the atmosphere when the gas reaches a predetermined pressure. It is not disclosed that a frame has openings in the area of ​​a seal seat and that a closing element is formed integrally with a venting device. Object of the invention

[0006] The object of the invention is to provide an alternative check valve with integrated venting, which allows filling of liquid into a downstream container with a constant volume and has an effective check effect, and which preferably reduces the penetration of odors. Description of the invention

[0007] The invention solves the problem with the features of the claims and in particular provides a check valve and a toilet provided therewith, which can be arranged between an inlet end and an opposite outlet end along a common longitudinal axis in succession, e.g. in this order, optionally an adapter arranged between the inlet end and a sealing seat, a sealing seat formed by a rigid frame, a closing element formed by an elastic closure part, optionally a stop which can be latched to the frame and has a closure piece which is arranged between the stop and the closure part and is movable between them, wherein the frame and the closure part are shaped to match one another in the region of the sealing seat, preferably funnel-shaped and tapering towards the inlet end, and the closure part, due to its elasticity, is tensioned against the frame in the region of the sealing seat in a normal position of the check valve and rests against the frame and is held in it, wherein the frame has openings in the region of the sealing seat and the closing element is formed integrally with a venting device.In general, the closing element is designed so that when pressure is applied in the flow direction it folds away from the seal seat so that the check valve opens, and when pressure is applied in the blocking direction and in the normal or rest position it rests against the frame so that the check valve closes. The optional closure piece is designed so that when pressure is applied in the flow direction it rests against the stop in an open position so that the check valve is permeable to liquid and air, and when pressure is applied in the blocking direction it rests against the closure part in a closed position so that the check valve closes. In general, the frame and the closure part can be shaped to fit together in the area of ​​the seal seat in a plane, e.g. as a plate, or tapered in a funnel shape, each with at least a triangular cross-section, e.g. a cross-section that is up to octagonal or up to hexagonal, preferably an oval or circular cross-section.

[0008] In particular, the check valve is suitable for use in a separation toilet, especially for placement in the flow path provided for liquid waste, which is formed by a separation insert. A separation toilet is understood to be a toilet that drains liquid and solid waste into separate containers, e.g., by means of a sieve and / or separation insert with two flow paths adjacent to a larger opening, e.g., formed by a toilet bowl, which run separately from each other.

[0009] Generally, the check valve is contacted at its inlet end by, for example, a hose or a basin, preferably a toilet bowl, and is contacted at its outlet end by, for example, a closed container, a flange or a hose, preferably a collecting container. The direction from the inlet end towards the outlet end is the flow direction and the opposite direction, i.e. from the outlet end towards the inlet end, is the blocking direction of the check valve. A normal position of the check valve is defined by the inlet end being arranged above the outlet end so that the gravity or weight forces act towards the outlet end. In an overhead position, the outlet end is arranged above the inlet end so that the gravity or weight forces act in the opposite direction, i.e. towards the inlet end.When the check valve is in its rest position, essentially no forces or pressures from liquids or gases act on the check valve from the inlet end.

[0010] Generally, the optional adapter, frame, closure member, optional closure piece, and optional stop of the check valve all have a substantially circular cross-section or are substantially rotationally symmetrical. This allows the check valve to be easily assembled and tolerate slight deviations in the alignment of the inlet and outlet ends without leaking.

[0011] The frame of the check valve is preferably formed in one piece and acts in an inner section of its cross-section as a sealing seat of the check valve and optionally in an outer section of its cross-section as a closure against, for example, a container or hose connected to the outlet end of the check valve. The frame is made of a rigid or flexurally resistant material, e.g., hard plastic, e.g., polypropylene. The frame is arranged with a first side toward the inlet end and a second side toward the outlet end, wherein the distance between the first and second sides along the surface normal is also referred to as the thickness of the frame.

[0012] In the inner section of its cross-section, the frame is shaped like a funnel, tapering toward the inlet end and forming the sealing surface of the check valve. The frame has an opening in the center of its cross-section.

[0013] In the wall of its inner section or in the sealing surface, the frame has openings, each of which is preferably arranged with a first end toward the opening and an opposite second end toward the outer section of the frame, e.g., the funnel. The openings preferably each extend toward the opening, with struts extending in the spaces between them. For example, at least three openings can be arranged in the frame, with at least three struts extending between them.

[0014] In the outer section of its cross-section, the frame is optionally shaped as a closure, e.g., as a union nut or lid, preferably with an internal screw thread. This ensures that the check valve is tightly sealed toward the outlet end, except for the perforations in the sealing surface and the opening, so that no air or liquid can escape from the outer section of the check valve, e.g., from a container, such as a urine tank.

[0015] Preferably, the frame has contact webs in the area of ​​the openings on the first side of the frame, which are designed to be contacted in a liquid-tight manner by the optional adapter or, for example, by a separating insert of a composting toilet. The contact webs extend in the area adjacent to the second end of the openings and preferably only over a portion of the thickness of the frame, preferably not beyond the first side of the frame. A frame with contact webs has the advantage that, compared to, for example, the optional adapter, it has a higher sealing effect than a frame without contact webs.Furthermore, since the contact webs preferably do not extend over the entire thickness of the frame, the surface area of ​​the openings on the second side of the frame is advantageously increased, so that the check valve opens at a lower fluid pressure than a check valve with contact webs that extend over the entire thickness of the frame.

[0016] On its second side opposite the first side or in the direction of the outlet end, the frame is contacted by a closure part which acts as a closing element or sealing element or valve flap in that it is designed to fit the frame in a funnel section, e.g. in a funnel shape, so that in the rest position it preferably contacts the frame in its inner section over its entire surface and is preferably tensioned against the frame, optionally is not loaded against the frame, e.g. is not additionally spring-loaded. The funnel opening of the closure part in a funnel section preferably has an opening angle which corresponds to the opening angle of the frame in its inner section, in particular an opening angle of at least 20°, preferably at least 30°, at least 40°, at least 50°, at least 60° or at least 70° up to 120°, preferably up to 110°, up to 100°, up to 90° or up to 80°, more preferably up to < 90°.

[0017] The closure part is generally made of a softer material than the frame or is elastic, e.g. made of rubber, silicone or thermoplastic polyurethane (TPU) and is designed so that when pressure is applied in the flow direction it folds away from the frame so that the check valve opens and is thus permeable in the flow direction, and when pressure is applied in the blocking direction or in the rest position it rests against the frame due to its elasticity so that the check valve closes and is thus impermeable in the blocking direction.

[0018] Generally, the closing element is formed integrally with a venting device. For example, the closure part can have an opening in one section designed to relieve excess pressure in the blocking direction of the check valve. The venting device can be, for example, an opening, optionally at the end, in particular a slot at the end, in the elastic material of the closure part.

[0019] In the preferred embodiment, the closure part protrudes at a first end with a venting section adjoining the funnel section through the opening of the frame and has, in the direction of the inlet end and at a distance from the frame, a passage, for example at the end, which is designed to form an opening in the closure part. The venting section is preferably hollowed out over its entire length and in particular forms a line so that gas can flow from the outlet end through the venting section to the inlet end of the check valve when pressure is applied in the blocking direction of the check valve. The blocking or flow direction of the passage is preferably reversed to the blocking or flow direction of the check valve. It is preferred that the passage is permeable to gas in its flow direction and impermeable to liquid.

[0020] Optionally, the passage is formed by a non-return valve, e.g., a lip. This makes the passage impermeable to gas, especially odors, preferably in the rest position.

[0021] A sieve or filter can be arranged between the funnel section and the venting section of the closure part, with the transition between the funnel section and the venting section preferably being open. It has been shown that the check valve seals well in the blocking direction even with an open transition between the funnel section and the venting section, and no liquid penetrates through the passage of the closure part.

[0022] Optionally, the closure part is preferably configured to fold or open away from the frame at an applied pressure corresponding to a liquid fill level at the inlet end of the check valve, at which the venting section of the closure part partially protrudes above the fill level, so that when the check valve opens, the passage protrudes above the liquid or the passage is arranged above the liquid surface. This provides the advantage of the check valve that pressure equalization through the passage occurs quietly, in particular without bubbling.

[0023] Preferably, the closure part contacts the frame only in the area of ​​the opening and in an area at the second end of the closure part, which can be designed, for example, as a projection.

[0024] Generally, the closure element is secured to the sealing seat. It is preferred that the outer cross-section of the closure part, in the area that protrudes through the frame, is at least partially larger than the cross-section of the opening in the center of the frame. In particular, it has an undercut, which can be formed, for example, next to a circumferential bead, and is thus held in place by clamping by the frame. This gives the closure element the advantage that it can be held exclusively by clamping in the sealing seat and is, for example, easily replaceable.

[0025] Optionally, the frame is contacted on its first side, which faces the inlet end of the check valve, by an adapter whose outer cross-section is preferably cylindrical. The adapter is preferably elastic, in particular made of a softer material than the frame, e.g. of silicone or TPU. The adapter has a first end and a second end opposite along the common longitudinal axis, wherein the adapter is arranged with its first end adjacent to the inlet end of the check valve and with its second end adjacent to the frame. The adapter seals between the inlet end and the sealing seat, ie on the side of the sealing seat opposite the closing element.

[0026] In one embodiment, the first end of the adapter can be arranged adjacent to, for example, a separating insert of a composting toilet or partially enclose it, and the second end of the adapter can contact the first side of the frame. The adapter thus acts as a seal between the inlet end and the sealing seat of the check valve. In general, the adapter is preferably not rigidly connected to the frame, but rather simply pressed against the first side of the frame.

[0027] The adapter preferably has, starting from its first end, a first section with a larger internal cross-section and, adjacent thereto, a second section with a smaller internal cross-section. A circumferential support surface is arranged between the first and second sections, preferably extending parallel to the cross-section of the adapter or transversely or at right angles to the common longitudinal axis. The adapter is configured to encompass an inlet container, e.g., a toilet bowl or, e.g., a partition insert, and to contact it with its support surface, thereby sealing it.

[0028] Alternatively or additionally, the adapter may have a thread or bayonet fitting formed on its inner side. This allows the adapter to be screwed onto a hose or basin connected to its first end, thus achieving a better seal than with an adapter with a smooth interior.

[0029] The adapter is generally designed to form a fluid-tight contact with the scaffolding on its first side with its second end. The second end of the adapter preferably contacts the struts of the scaffolding and optionally the support webs.

[0030] In its second section, the adapter preferably has a circumferential groove that divides the adapter into an outer section and an inner section, the ends of which are movable relative to each other. The adapter is designed such that its second end in the inner section has a smaller distance along the common longitudinal axis from the first end than in the outer section, so that it is adapted to the funnel-shaped wall of the frame and tightly contacts the frame with its second end in both the inner and outer sections.

[0031] Optionally, the check valve additionally has a stop between the closure part and the outlet end, e.g. at a distance from the frame, which stop can generally be locked to the frame. A closure piece is arranged between the stop and the closure part, wherein in the normal position of the check valve the closure piece is designed to allow venting through the venting device of the check valve and e.g. in the overhead position the closure piece is designed to additionally close access to the venting device, in particular the venting section and / or the venting device, so that no liquid can flow through e.g. the venting section towards the inlet end. The stop is designed to hold the closure piece.For this purpose, the stop generally has an opening with a diameter in the center of its cross-section, and the closure piece generally has a diameter that is larger than this opening and preferably larger or smaller than the diameter of the stop.

[0032] The stop is further configured to lock onto the frame and, in the normal position, to allow the liquid to flow through in the direction of flow. For this purpose, the stop can be lockable onto the frame, for example, by having at least one projection, for example at least or exactly three projections, which can each be locked into and released from opposite and matching recesses in the wall of the frame, such that the stop can be fixed at a distance from the frame about the common longitudinal axis. Alternatively, for example, the frame can have at least one projection, which preferably extends circumferentially over the entire circumference of the frame, and the stop can have at least one opposite matching, preferably circumferential recess.It is further preferred that the frame has a circumferential edge which extends from the frame wall in the direction of the outlet end of the check valve and preferably rests against the stop when the stop is fixed to the frame.

[0033] In a first embodiment, the stop can extend adjacent to the opening in a funnel-shaped section tapering towards the inlet end. In this embodiment, the stop can be flat in a circumferential outer section opposite the opening adjacent to the funnel-shaped section and can preferably be arranged transversely to the common longitudinal axis. The opening angle of the funnel-shaped section of the stop is then preferably smaller than the opening angle in the funnel-shaped inner section of the frame, e.g. 10° to 50° smaller. The stop is made of a rigid material, e.g. hard plastic, in particular polypropylene. Openings are optionally arranged in the wall of the stop, which extend at a distance from the opening along the funnel-shaped section into the outer section of the stop and between which struts run.Preferably, in this first embodiment, the stop has at least 3 openings between which at least 3 struts run.

[0034] In this first embodiment with an optional stop, a stop ball is preferably arranged along the longitudinal axis as a closure piece between the stop and the closure part. The ball diameter of the stop ball is generally larger than the diameter of the opening. In general, the stop is spaced from the closure part in the area of ​​its opening by a distance that is greater than the portion of the ball diameter that projects beyond the plane of the opening when the stop ball is arranged in the opening. Preferably, the stop is formed in the area around its opening in sections transverse to the passage or blocking direction, so that in a circumferential area around the opening, the distance between the stop and the closure part is smaller than the ball diameter. The stop ball is designed to allow venting through the venting section of the closure part in the normal position of the check valve and, for example,in an overhead position to contact and thereby close the vent section so that no liquid can flow through the vent section towards the inlet end and / or the venting device.

[0035] In a second embodiment, the stop can extend substantially transversely to the common longitudinal axis and can not have a funnel-shaped region. Adjacent to the opening in the center of its cross-section, the stop can then have recesses which can extend radially up to a circumferential outer edge of the stop, preferably in a crenellated manner, i.e. with radial webs in between. In this second embodiment, the closure piece can be designed, for example, as a spherical section or as a curved plate, preferably have a diameter which is larger than the opening in the center of the stop and smaller than the diameter of the stop, and more preferably have crenellated recesses on its circumferential outer edge.In this embodiment, the closure piece is designed to allow venting through the venting section of the closure part when pressure is applied in the passage direction and to contact the closure part, e.g. in the region of its projection, when pressure is applied in the blocking direction and thereby close it, so that no liquid can flow through the venting section in the direction of the inlet end.

[0036] Preferably, the adapter, frame and closure part are made of materials that are machine-cleanable, e.g. machine-washable, in particular at 65°C, without permanently deforming, and more preferably are resistant to chlorine-containing cleaning agents.

[0037] Optionally, a small tube is attached in or on the venting section, in particular with its first end clamped into the venting section, wherein the small tube extends along the closure part, preferably also through and beyond the frame, and the small tube has a kink in the area or beyond its area that lies in the plane of the terminal cross-sectional opening of the closure part opposite the venting section, and at its second end opposite the first end and beyond the kink, has a passive element that can be a float or a weight with a higher density than water. The small tube, which is attached with its first end to the venting section, has a passive element at its opposite second end and a kink between them, which is preferably in the area of ​​the plane of the terminal cross-sectional opening of the closure part or outside the closure part.The terminal cross-sectional opening of the closure part is opposite the vent section and, in the case of a funnel-shaped closure part, is its larger terminal cross-sectional opening. If the passive element is a float, which has a lower density than water, the passive element is moved by the liquid and pivots the tube at the kink. If the passive element is a weight, the tube is moved at the kink when the tube is pivoted from the vertical and is kinked, for example, when the check valve is turned overhead. This tube can be clamped or locked to the inside or outside of the vent section, e.g. screwed on or locked with a bayonet catch. Alternatively, the tube can be formed as a single piece with the vent section, e.g. as an injection-molded part.

[0038] Generally, the adapter, frame, and closure element, as well as the optional tube at its venting section, are detachably connected to each other, and are not glued. This gives the check valve the advantage of being removable and easy to clean without the use of tools, and individual components can be replaced independently of one another.

[0039] The figures show in Fig. 1 a cross-sectional view of an embodiment of the check valve, Fig. 2 a cross-sectional view of the Fig. 1 shown embodiment in exploded view, Fig. 3 a cross-sectional view of another embodiment of the check valve, Fig. 4 a cross-sectional view of the Fig. 3 shown embodiment in exploded view, Fig. 5 a cross-sectional view of another embodiment of the check valve, Fig. 6 a cross-sectional view of the Fig. 5shown embodiment in exploded view and in Fig. 7 a design of the check valve.

[0040] In the figures, the same reference numbers denote functionally identical elements.

[0041] Fig. 1 shows an embodiment of the check valve 1 with an inlet end 2 and an outlet end 3 opposite one another along the common longitudinal axis, wherein the direction from the inlet end 2 to the outlet end 3 is the passage direction 4 and the opposite direction is the blocking direction 5. In the passage direction 4, an adapter 31, a frame 11 and a closure part 21 are arranged one after the other along a common longitudinal axis, wherein in the rest position of the check valve 1, the frame 11 is contacted by the adapter 31 on a first side 18 and by the closure part 21 on a second side 19.

[0042] In the middle of its cross section, the frame 11 arranged between the adapter 31 and the closure part 21 has an opening 16 through which a venting section 24 formed integrally with the closure part 21 projects. The closure part 21 forms the closing element and the venting section 24 forms the venting device of the check valve 1. The closure part 21 is held in the opening 16 in that it is arranged with a region of smallest external cross section 28 in the opening 16 and has a bead 26 in the direction of the inlet end 2, next to which an undercut is formed, wherein the bead 26 has a larger external cross section than the cross section of the opening 16. The internal cross section of the closure part 21 is according to Fig. 1in the area of ​​the venting section is essentially constant and tapers only in the direction of the outlet end 2 in the area of ​​the passage 25. At its opposite end facing the outlet end 3, the closure part 21 has a projection 27 with which it rests on the frame 11 and seals the check valve 1 in the blocking direction.

[0043] The second section 35 of the adapter 31 is divided in sections by means of a circumferential groove 37 into an inner section 38 and an outer section 39, wherein the distance along the common longitudinal axis between a first end 32 and a second end 33 of the adapter 31 is greater in the outer section 39 than in the inner section 38. As a result, the adapter 31 is adapted to contact and seal the frame 11 with its second end 33 both in the inner section 38 and in the outer section 39.

[0044] In Fig. 2The components of the check valve 1 are shown in detail. The frame 11 is funnel- or conically shaped in an inner section 12 and has openings 14 that converge toward the central opening 16 and form struts 15 between them. The struts 15 make the inner section 12 rigid.

[0045] In its outer section 13, the frame is shaped as a screw cap with an internal thread.

[0046] In the region of its openings 14, the frame has contact webs 17 which each extend only over a section of the cross-section of the openings 14, specifically only over part of the thickness, i.e. the distance between the first side 18 and the second side 19, of the frame. In the embodiment shown here, the contact webs extend from the plane of the first side 18 to approximately over half the thickness of the frame 11. In the region of the second side 19 of the frame, the recesses 14 therefore have a larger cross-section than in the region of the first side 18. The transition between the smaller and larger cross-section of the openings 14 can, as shown here, run parallel to the first or second side 18, 19, or can, for example, be bevelled.

[0047] The closure part 21 has a shape in a funnel section 29 which matches the second side 19 of the frame 11 and according to Fig. 2at the second end 23 of the closure part 21 terminates with a projection 27. In the direction from the second end 23 to the first end 22, the outer cross section of the closure part 21 initially tapers conically to an area of ​​smallest cross section 28 and then widens to a bead 26 whose outer cross section is larger than the cross section of the opening 16, and can then taper again, for example, towards the first end 22. The inner cross section of the closure part 21 tapers from the second end 23 to the first end 22, initially in a funnel shape in the area of ​​the funnel section 29 and then runs in the area of ​​the venting section 24 with an essentially constant inner cross section, as shown here as an option, before the inner cross section tapers to the passage 25.

[0048] The funnel section 29 is formed integrally with the venting section 24, so that the closure part 21 simultaneously acts as a venting device.

[0049] The adapter 31 is divided, starting from its first end 32 and moving towards its second end 33, into a first section 34 and a second section 35. The second section 35 has a smaller internal cross-section than the first section 34, while the external cross-section of the adapter is essentially constant. A support surface 36 is arranged between the first and second sections 34, 35 and runs parallel to the cross-sectional plane of the adapter 31. In its second section 35, the adapter 31 is divided by a circumferential groove 37 into an inner section 38 and an outer section 39, which form an inner and outer ring, respectively, at the second end 33 of the adapter. The adapter 31 is preferably configured to contact and seal the frame 11 with both the inner ring and the outer ring in the region of the contact webs 17.

[0050] In the rest position of the check valve 1, the adapter 31 rests with its second end 33 on the first side 18 of the frame 11 and the closure piece 21 rests at least in the region of the projection 27 on the second side 19 of the frame 11, with the venting section 24 protruding at least partially through the opening 16 of the frame 11. If a liquid is added to the inlet end 2 of the check valve 1, its weight exerts pressure on the funnel section 29 of the closure part 21 in the direction away from the frame 11. As a result, the funnel section 29 folds away from the frame 11 and allows the liquid to flow through the openings 14 in the flow direction 4. The bead 26 prevents the closure part 21 from slipping out of the opening 16 of the frame 11.If an overpressure is built up in a downstream container by the inflowing liquid, air simultaneously flows through the vent section 24 and the passage 25 in the opposite direction, which is the blocking direction 5 of the check valve 1. After the liquid has flowed through, the funnel section 27 folds back toward the frame 11 and contacts it.

[0051] If the check valve 1 or a toilet containing the check valve 1 is rotated, e.g., into an overhead position, the liquid in the downstream container exerts pressure on the closure part 21 in the blocking direction 5 due to its weight. As a result, the closure part 21 is pressed against the frame 11 in the area of ​​its funnel section 29 and seals its inner section 12 so that no liquid can pass through. Likewise, no liquid can escape through the passage 25 because it is impermeable to liquids. In the outer section 13, the frame closes the container with a screw cap so that no liquid can escape here either.

[0052] In the Fig. 3 and 4In the embodiment of the check valve 1 shown, a frame 11, a closure part 21, a stop ball as a closure piece 47 and a stop 41 are arranged adjacent to one another between the inlet end 2 and the outlet end 3 along a common longitudinal axis.

[0053] The stop 41 has a ball seat as an opening 44 in the center of its cross-section and a plurality of openings 45 in its funnel-shaped section 42, which form struts 46 between them. The struts 46 make the funnel-shaped section 42 rigid. The openings 45 extend into the outer section 43 of the stop 41, which is formed transversely to the common longitudinal axis, so that in the position in which the closure part 21 is folded away from the frame 11 and rests against the stop 41, the openings 45 are still partially accessible and fluid can flow through them. A stop ball as a closure piece 47 is arranged in the opening 44 and is spaced from the closure part 21 in the normal or rest position of the check valve 1 shown here. The frame 11 has a circumferential edge 48 that extends in the direction of the outlet end 3.

[0054] As in Fig. 3As shown, the stop 41 has a smaller opening angle in its funnel-shaped section 42 than the opening angle in the inner section 12 of the frame 11.

[0055] Fig. 4 shows a projection 49, by means of which the stop 41 can be locked to the frame 11. The projection 49 engages in opposite matching recesses in the wall of the frame 11. In Fig. 3 the stop 41 is fixed to the frame 11 so that the edge 48 contacts the stop 41.

[0056] If a liquid is added to the inlet end 2 of the check valve 1, the weight of the liquid exerts pressure on the funnel section 29 of the closure part 21 in the direction away from the frame 11. As a result, the funnel section 29 folds away from the frame 11 up to the stop 41 and allows the liquid to flow through the openings 14, 45 in the direction of the outlet end 3. The closure part 21 is prevented from slipping out of the opening 16 of the frame 11 by the undercut formed next to the bead 26, with which the closure part rests on the frame 11. However, even if the closure part 21 were to partially slip out of the frame 11, it would only slip out far enough until it hits the stop ball as the closure piece 47, with the venting section 24 still protruding through the opening 16.

[0057] If excess pressure is built up in a downstream container due to the inflowing liquid, air flows through the vent section 24 in the opposite direction. After the liquid has flowed through, the funnel section 29 folds back toward the frame 11 and contacts it.

[0058] If the check valve 1 is rotated into an overhead position, the closure piece 47, designed as a stop ball, is moved by its gravity out of the opening 44 in the direction of the closure part 21 and closes its venting section 24 so that no liquid can penetrate through it in the direction of the inlet end 2.

[0059] In the Fig. 5 and 6In the embodiment of the check valve 1 shown, a frame 11, a closure part 21, a closure piece 47 and a stop 41 are arranged one after the other between the inlet end 2 and the outlet end 3 along a common longitudinal axis.

[0060] The stop 41 has an opening 44 in the center of its cross-section and adjacent recesses, each of which extends radially in the wall of the stop 41 in a crenellated manner. The stop 41 is formed in an outer region 43 parallel to the common longitudinal axis and has a circumferential recess into which a circumferential projection 49 formed in the edge 48 of the frame 11 engages. Fig. 5 the stop 41 is locked to the frame 11, with the edge 48 contacting the stop 41.

[0061] The closure piece 47 is designed as a curved plate whose diameter is larger than the diameter of the opening 44, but smaller than the diameter of the stop 41. Recesses are arranged in a crenellated manner in the circumferential outer edge of the closure piece 47, so that in the normal position of the check valve 1, fluid can flow through the crenellated recesses in the closure piece 47 and stop 41 in the direction of the outlet end 3. The closure part 21 folded away from the frame 11 can contact the closure piece 47, or can be arranged with its projection 29 at a distance from the closure piece.

[0062] If the check valve 1 is turned into an overhead position, the closure piece 47 designed as a spherical cutout is moved by its gravity in the direction of the closure part 21 and contacts this, for example in the area of ​​the projection 29, so that the venting section 24 is closed so that no liquid can flow through it in the direction of the inlet end 2.

[0063] Fig. 7shows a tube 50 that extends through the closure part 21 and the frame 11. The first end 51 of the tube 50 is secured in the venting section 24 by clamps, and its opposite second end 52 projects beyond the closure part 21 in the unloaded state. The tube 50 has a kink 53, which is preferably located in the region of the plane of the terminal cross-sectional opening 21o of the closure part 21 or outside the closure part 21. Attached to the second end 52 of the tube 50 is a passive element 54, which, in the float design, floats when subjected to liquid and pivots the second end 52 of the tube 50 around the kink 53, reducing its internal cross-section, preferably closing it. The tube 50, together with the float as a passive element 54, therefore acts in the kink 53 as a closure piece for the venting section 24 when the liquid level below the closure part 21 rises.

[0064] Alternatively, the passive element 54 may be a weight with a higher density than water, so that pivoting of the tube 50 from the vertical, e.g. when tilting the check valve, reduces the internal cross-section in the kink 53. Reference symbol:

[0065] 1 check valve 33 second end 2 Admitting 34 first section 3 Omitting 35 second section 4 Flow direction 36 Support surface 5 Blocking direction 37 Nut 11 scaffolding 38 inner section 12 inner section 39 outer section 13 outer section 41 stop 14 breakthrough 42 funnel-shaped section 15 strut 43 outer section 16 opening 44 opening 17 jetty 45 breakthrough 18 first page 46 strut 19 second page 47 closure piece 21 locking part 48 edge 21o terminal cross-sectional opening 49 projection 22 first end 50 tube 23 second end 51 first end of the tube 24 Ventilation section 52 second end of the tube 25 passage 53 kink 26 bead 54 Passive element 27 cantilever 28 Area of ​​smallest external cross-section 29 funnel section 31 adapter 32 first end

Claims

1. Non-return valve (1) for use on a toilet, which is arranged between an inlet end (2) and an opposite outlet end (3) along a common longitudinal axis in this order - a seal seat formed by a rigid frame (11) and - a sealing element formed by an elasticated closure part (21) wherein the frame (11) and the closure part (21) in the region of the seal seat are formed matching in a funnel shape running towards the inlet end (2) and the closure part (21) is loaded against the frame (11) in the region of the seal seat in a resting position of the non-return valve (1) and is held therein, wherein the frame (11) has openings (14) in the region of the seal seat and the sealing element is formed in one piece with a venting device, wherein the venting device is formed by the closure part (21) with a venting section (24) projecting in sections through an opening (16) of the frame (11) and at a distance from the frame (11) having a passage (25) in the direction of the inlet end (2).

2. Non-return valve (1) according to claim 1, characterised in that the closure part (21) is held on the frame (11) in that it rests on the frame (11) by means of an undercut formed next to a bead (26) in the region which projects through the opening (16) of the frame (11) and is clamped to the latter.

3. Non-return valve (1) according to one of the preceding claims, characterised in that the passage (25) is formed by a non-return closure.

4. Non-return valve (1) according to one of the preceding claims, characterised in that the closure part (21) is set up so that it already opens at a pressure which corresponds to a filling level of liquid at the inlet end (2) of the non-return valve (1), at which the venting section (24) of the closure part (21) in sections projects above the filling level.

5. Non-return valve (1) according to one of the preceding claims, characterised by a resilient adapter (31) having a first end (32) and a second end (33) opposite along the common longitudinal axis, wherein the adapter (31) is arranged with its first end (32) adjacent to the inlet end (2) of the non-return valve (1) and is arranged with the second end (33) adjacent to the frame (11).

6. Non-return valve (1) according to claim 5, characterised in that the adapter (31), starting from its first end (32), has a first section (34) with a larger internal cross-section and, adjacent thereto, a second section (35) with a smaller internal cross-section, a circumferential bearing surface (36) being arranged between the first and second sections (34, 35), which bearing surface extends transversely to the common longitudinal axis.

7. Non-return valve (1) according to one of claims 5 to 6, characterised in that the adapter (31) has a circumferential groove (37) in its second section (35), by means of which the adapter (31) is divided into an inner section (38) and an outer section (39), the ends of which are movable relative to one another.

8. Non-return valve (1) according to one of the preceding claims, characterised in that the frame (11) has contact webs (17) on a first side (18), which extend over a portion of the thickness of the frame (11).

9. Non-return valve according to one of the preceding claims, characterised in that the frame in an outer section (13) of its cross-section is formed as a closure, preferably with an internally formed screw thread.

10. Non-return valve (1) according to one of the preceding claims, characterised in that it additionally has a stop (41), which can be latched to the frame (11), between the closure part (21) and the outlet end (3) and a closure piece (47) arranged between the stop (41) and the closure part (21), wherein the stop (41) in the centre of its cross-section has an opening (44) and is arranged to hold the closure piece (47) and, in a normal position of the non-return valve (1), to allow liquid to flow through in the direction of the outlet end (3), wherein the closure piece (47) has a diameter which is larger than the opening (44) and smaller than the diameter of the stop (41), and the closure piece (47) is designed to allow venting through the venting device in the normal position of the non-return valve (1) and to close the venting device in an overhead position of the non-return valve (1).

11. Non-return valve (1) according to one of the preceding claims, characterised in that it consists of an adapter (31), the frame (11), the closure part (21), a closure piece (47) and a stop (41).

12. Non-return valve (1) according to one of the preceding claims, characterised by a tube (50) connected by its first end (51) to the venting section (24), which extends through the closure part (21) and whose second end (52) opposite the first end (51) has a passive element (54), with a kink (53) of the tube (50) between its first end (51) and the passive element (54).

13. Non-return valve (1) according to claim 12, characterised in that the kink (53) lies in the plane of the terminal cross-sectional opening of the closure part (21) opposite the venting section (24).

14. Non-return valve (1) according to any one of claims 12 to 13, characterised in that the passive element (54) is a float or a weight with a higher density than water.

15. Separating toilet comprising a non-return valve according to one of the preceding claims.