DE102022202198B4 - Check valve with venting device - Google Patents

Abstract

Non-return valve (1) for use on a toilet, which has between an inlet end (2) and an opposite outlet end (3) along a common longitudinal axis in this order - a sealing seat formed by a rigid frame (11) and - a closing element formed by an elastic closure part (21), wherein the frame (11) and closure part (21) in the region of the sealing seat are designed to match one another in a funnel shape tapering towards the inlet end (2) and the closure part (21) is tensioned against the frame (11) in the region of the sealing seat and held in it in a rest position of the non-return valve (1), wherein the frame (11) has openings (14) in the region of the sealing seat and the closing element is designed in one piece with a venting device, characterized in that the venting device is formed in that the closure part (21) with a venting section (24) extends in sections through an opening (16) of the frame (11) and has a passage (25) in the direction of the inlet end (2) at a distance from the frame (11).

Description

The present invention relates to a check valve that is suitable for use in a mobile or stationary toilet, e.g. as an odor trap, and a toilet with the check valve. The check valve is characterized by the fact that it is of simple construction and effectively prevents a backflow of liquid and the escape of odors. The check valve is characterized by an integrated venting device that is preferably low-noise and does not allow a flow of liquid in the blocking direction of the check valve.

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.

The EN 11 2019 001 896 T5 describes a pressure relief valve with a funnel-shaped frame and a funnel-shaped elastic component which rests therein in the closed position and which is clamped with a solid tip in an opening at the top of the frame.

The EP 1 531 070 B1 describes a pressure relief valve which can be used to relieve pressure from a car interior, with a funnel-shaped elastic part which is held in the frame by a ring which is attached to the larger opening of a funnel-shaped frame.

It is known to use check valves with built-in cones to protect against backflow of liquids. These have the disadvantage that a separate venting device must be installed, otherwise a collecting container with a constant volume downstream of the check valve builds up excess pressure, which makes it difficult for further liquid to flow in.

Object of the invention

The invention has for its object to provide an alternative check valve with integrated venting, which allows liquid to be filled into a downstream container with a constant volume and has an effective check effect, and which preferably reduces the penetration of odors.

Description

• - optional einen zwischen dem Einlassende und einem Dichtungssitz angeordneten Adapter,
• - einen von einem starren Gerüst gebildeten Dichtungssitz,
• - ein von einem elastischen Verschlussteil gebildetes Schließelement,
• - optional einen mit dem Gerüst verrastbaren Anschlag mit Verschlussstück, das zwischen dem Anschlag und dem Verschlussteil angeordnet ist,

aufweist oder daraus besteht, wobei das Gerüst und das Verschlussteil im Bereich des Dichtungssitzes zueinander passend trichterförmig in Richtung auf das Einlassende zulaufend ausgebildet sind und das Verschlussteil durch seine Elastitizität in einer Normalstellung des Rückschlagventils im Bereich des Dichtungssitzes gegen das Gerüst gespannt und gegen das Gerüst anliegt und in diesem gehaltert ist, wobei das Gerüst im Bereich des Dichtungssitzes Durchbrechungen aufweist und das Schließelement einstückig mit einer Entlüftungseinrichtung ausgebildet ist. Generell ist das Schließelement eingerichtet, dass es bei in Durchlassrichtung anliegendem Druck von dem Dichtungssitz weg klappt, sodass das Rückschlagventil öffnet, und bei in Sperrrichtung anliegendem Druck und in Normal- bzw. Ruhestellung an dem Gerüst anliegt, sodass das Rückschlagventil schließt. Weiter ist das optionale Verschlussstück eingerichtet, dass es bei in Durchlassrichtung anliegendem Druck in einer Offenstellung am Anschlag anliegt, sodass das Rückschlagventil für Flüssigkeit und Luft durchlässig ist, und es bei in Sperrrichtung anliegendem Druck in einer Schließstellung am Verschlussteil anliegt, sodass das Rückschlagventil schließt.The invention solves the problem with the features of the claims and in particular provides a check valve and a toilet provided therewith, which between an inlet end and an opposite outlet end along a common longitudinal axis in succession, ie in this order,

• - optionally an adapter arranged between the inlet end and a sealing seat,
• - a sealing seat formed by a rigid framework,
• - a closing element formed by an elastic closing part,
• - optionally a stop that can be locked to the frame with a locking piece that is arranged between the stop and the locking part,

has or consists of, wherein the frame and the closure part in the region of the sealing seat are designed to match one another in a funnel shape tapering towards the inlet end and the closure part is tensioned against the frame due to its elasticity in a normal position of the check valve in the region of the sealing seat and rests against the frame and is held in place therein, wherein the frame has openings in the region of the sealing seat and the closing element is designed in one piece with a venting device. In general, the closing element is designed such that when pressure is applied in the passage direction it folds away from the sealing 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. Furthermore, the optional closure piece is designed so that when pressure is applied in the passage 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.

The check valve is particularly suitable for use in a separation toilet. A separation toilet is a toilet that drains liquid and solid waste into separate containers, e.g. using a sieve and/or separating insert.

Generally, the check valve is contacted at its inlet end by e.g. a hose or a basin, preferably a toilet bowl, and is contacted at its outlet end by e.g. 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, ie from the outlet end towards the inlet end, 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 in the direction of 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, ie in the direction of the inlet end. A rest position of the check valve is defined by the fact that essentially no forces or pressures from liquids or gases act on the check valve.

In general, the optional adapter, the frame, the closure part, the optional closure piece and the optional stop of the check valve all have a substantially circular cross-section or are substantially rotationally symmetrical. This gives the check valve the advantage of being easy to assemble and tolerating slight deviations in the alignment of the inlet and outlet ends without leaking.

The framework 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 framework is made of a rigid material, e.g. hard plastic, e.g. polypropylene. The framework is arranged with a first side in the direction of the inlet end and with a second side in the direction of 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 framework.

In the inner part of its cross-section, the frame is shaped like a funnel that tapers towards the inlet end and forms the sealing surface of the check valve. In the center of its cross-section, the frame has an opening.

In the wall of its inner section or in the sealing surface, the frame has openings, which are preferably arranged with a first end in the direction of the opening and with an opposite second end in the direction of the outer section of the funnel, wherein the openings preferably each run in the direction of the opening and struts run in the spaces between them. For example, at least 3 openings can be arranged in the frame, between which at least 3 struts run.

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 means that the check valve is designed to seal tightly in the direction of the outlet end, apart from the perforations in the sealing surface and the opening, so that no air or liquid can escape in the area of the outer section of the check valve from, for example, a container, e.g. a urine tank.

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 separation 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 it has a higher sealing effect compared to, for example, the optional adapter than a frame without contact webs. In addition, the fact that the contact webs do not extend over the entire thickness of the frame, as is preferred, advantageously increases the surface area of the openings on the second side of the frame, so that the check valve opens at a lower liquid pressure than a check valve with contact webs that extend over the entire thickness of the frame.

On its second 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 in a funnel section to match the frame 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 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°.

The closure part is generally made of a softer material than the frame or is elastic, e.g. rubber, silicone or thermoplastic polyurethane (TPU) and is designed to fold away from the frame when pressure is applied in the flow direction, so that the check valve opens. net and is therefore 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 therefore impermeable in the blocking direction.

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

In the preferred embodiment, the closure part extends 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, a passage, e.g. at the end, at a distance from the frame, which is designed to form an opening in the closure part. The venting section is preferably hollowed out over its entire length 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 the opposite of 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.

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 resting position.

A sieve or a 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. This is because it has been shown that, surprisingly, 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.

Optionally, the closure part is preferably designed such that it folds away from the frame or opens when there is a pressure that corresponds to a filling level of liquid at the inlet end of the check valve, at which the venting section of the closure part protrudes in sections above the filling level, so that when the check valve is opened, the passage protrudes from the liquid or the passage is arranged above the liquid surface. The check valve therefore has the advantage that the pressure equalization through the passage takes place quietly, in particular without bubbling.

Preferably, the closure part contacts the frame only in the region of the opening and in a region at the second end of the closure part, which can be designed as a projection, for example.

Generally, the closing element is held on the sealing seat. It is preferred that the external 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 has an undercut, which can be formed e.g. next to a circumferential bead, and is thus held in a clamping manner by the frame. This gives the closing element the advantage that it can only be held in a clamping manner in the sealing seat and is e.g. easy to replace.

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. silicone or TPU. The adapter has a first end and a second end opposite along the common longitudinal axis, the adapter being 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, i.e. on the side of the sealing seat opposite the closing element.

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

The adapter preferably has, starting from its first end, a first section with a larger inner cross-section and, adjacent thereto, a second section with a smaller inner cross-section, wherein a circumferential support surface is arranged between the first and the second section, which is preferably parallel to the cross-section of the adapter or transversely or at a right angle to the common longitudinal axis. The adapter is designed to encompass an inlet container, e.g. a toilet bowl or a separating insert, and to contact it with its support surface, thereby sealing it.

Alternatively or additionally, the adapter can have a thread formed on its inside or a bayonet lock. This means that the adapter is designed to be screwed onto a hose or basin connected to its first end, so that a better sealing effect is achieved than with an adapter with a smooth inside.

The adapter is generally designed so that its second end makes liquid-tight contact with the scaffold on its first side. The second end of the adapter preferably makes contact with the struts of the scaffold and optionally with the support webs.

In its second section, the adapter preferably has a circumferential groove which divides the adapter into an outer section and an inner section, the ends of which are movable relative to one another. 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 section and the outer section.

Preferably, the check valve additionally has a stop between the closure part and the outlet end, e.g. at a distance from the frame, which 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 off 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 in the direction of 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.

The stop is further designed to lock with 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 locked with the frame, for example, by having at least one projection, e.g. at least or exactly 3 projections, which can each be locked into and released from opposite and matching recesses in the wall of the frame, so that the stop can be fixed at a distance from the frame around 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 that extends from the frame wall towards the outlet end of the check valve and preferably rests against the stop when it is fixed to the frame.

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 preferably 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. In this first embodiment, the stop preferably has at least 3 openings, between which at least 3 struts run.

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 larger than the portion of the ball diameter that protrudes beyond the plane of the opening when the stop ball is arranged in the opening. Preferably, the stop is formed in sections in the area around its opening 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, to contact the venting section in the overhead position and thereby close it so that no liquid can flow through the venting section in the direction of the inlet end and/or to the venting device.

In a second embodiment, the stop can extend essentially transversely to the common longitudinal axis and have no funnel-shaped region. Adjacent to the opening in the center of its cross section, the stop can then have recesses which can extend radially to a peripheral 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 that 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 peripheral 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, for example in the region of its projection, and thereby close it when pressure is applied in the blocking direction, so that no liquid can flow through the venting section in the direction of the inlet end.

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.

In general, the adapter, frame and closure part of the check valve are detachably connected to one another, in particular they are not glued. This gives the check valve the advantage that it can be removed and cleaned without the use of tools, and individual components can be replaced independently of one another.

• - 1 eine Querschnittsansicht einer Ausführungsform des Rückschlagventils,
• - 2 eine Querschnittsansicht der in 1 gezeigten Ausführungsform in Explosionszeichnung,
• - 3 eine Querschnittsansicht einer weiteren Ausführungsform des Rückschlagventils,
• - 4 eine Querschnittsansicht der in 3 gezeigten Ausführungsform in Explosionsansicht,
• - 5 eine Querschnittsansicht einer weiteren Ausführungsform des Rückschlagventils und
• - 6 eine Querschnittsansicht der in 5 gezeigten Ausführungsform in Explosionsansicht.

The figures show in

• - 1 a cross-sectional view of an embodiment of the check valve,
• - 2 a cross-sectional view of the 1 shown embodiment in exploded view,
• - 3 a cross-sectional view of another embodiment of the check valve,
• - 4 a cross-sectional view of the 3 shown embodiment in exploded view,
• - 5 a cross-sectional view of another embodiment of the check valve and
• - 6 a cross-sectional view of the 5 shown embodiment in exploded view.

In the figures, identical reference numerals designate functionally identical elements.

1 shows an embodiment of the check valve 1 with inlet end 2 and outlet end 3 opposite 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 is contacted by the closure part 21 on a second side 19.

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 in one piece with the closure part 21 protrudes. 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 by being arranged in the opening 16 with a region of the smallest external cross section 28 and having a bead 26 in the direction of the inlet end 2, next to which an undercut is formed, the bead 26 having 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 1 in the region of the venting section is essentially constant and tapers only in the direction of the outlet end 2 in the region 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.

The second section 35 of the adapter 31 is divided into 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 in both the inner section 38 and the outer section 39.

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

In its outer section 13, the frame is designed as a screw cap with an internal thread.

In the area of its openings 14, the frame has contact webs 17, each of which extends over only a portion of the cross-section of the openings 14, and specifically only over a portion 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 half the thickness of the frame 11. In the area of the second side 19 of the frame, the recesses 14 therefore have a larger cross-section than in the area 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 be beveled, for example.

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 2 at the second end 23 of the closure part 21 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 form a bead 26 whose outer cross section is larger than the cross section of the opening 16 and can then taper again towards the first end 22, for example. At the same time, the inner cross section of the closure part 21 tapers in the direction 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 essentially constantly in the area of the vent section 24 before, as shown here, the inner cross section tapers to the passage 25.

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

The adapter 31 is divided into a first section 34 and a second section 35, starting from its first end 32 in the direction of its second end 33. The second section 35 has a smaller internal cross section than the first section 34, the external cross section of the adapter being essentially constant. A support surface 36 is arranged between the first and second sections 34, 35, which according to 2 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 at the second end 33 of the adapter. The adapter 31 is, as shown here, preferably designed to contact and seal the frame 11 with both the inner ring and the outer ring in the area of the contact webs 17.

When the check valve 1 is in the rest position, 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 area 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 provided at 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 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 towards the frame 11 and contacts it.

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 flow through. No liquid can escape through the passage 25 either, as this is impermeable to liquids. In the outer section 13, the frame closes the container. by means of a screw cap so that no liquid can escape.

In the 3 and 4 In 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 one after the other between the inlet end 2 and the outlet end 3 along a common longitudinal axis.

The stop 41 has a ball seat as an opening 44 in the center of its cross section and a number 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 liquid can flow through them. A stop ball is arranged in the opening 44 as a closure piece 47 which is spaced apart from the closure part 21 in the normal or rest position of the check valve 1 shown here. The frame 11 has a peripheral edge 48 which extends in the direction of the outlet end 3.

As in 3 As clearly illustrated, the stop 41 in its funnel-shaped section 42 has a smaller opening angle than the opening angle in the inner section 12 of the frame 11.

The exploded view of the 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 3 the stop 41 is fixed to the frame 11 so that the edge 48 contacts the stop 41.

If a liquid is provided at 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 until it hits the stop ball as the closure piece 47, with the vent section 24 continuing to protrude through the opening 16 in sections.

If excess pressure is built up in a downstream container by the inflowing liquid, air simultaneously flows through the vent section 24 in the opposite direction. After the liquid has flowed through, the funnel section 29 folds back towards the frame 11 and contacts it.

If the check valve 1 is rotated into an overhead position, the closure piece 47, which is 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 vent section 24 so that no liquid can penetrate through it in the direction of the inlet end 2.

In the 5 and 6 In 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.

The stop 41 has an opening 44 in the center of its cross section and recesses adjacent thereto, which extend in the form of battlements radially in the wall of the stop 41. 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. In 5 the stop 41 is locked to the frame 11, whereby the edge 48 contacts the stop 41.

The closure piece 47 is designed as a curved plate, the diameter of which 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 peripheral outer edge of the closure piece 47, so that in the normal position of the check valve 1, liquid 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.

If the check valve 1 is turned into an overhead position, the closure piece 47, which is designed as a spherical cutout, is pulled by its gravity towards the closure part 21 moves and contacts this, for example, in the area of the projection 29, so that the vent section 24 is closed so that no liquid can penetrate through it in the direction of the inlet end 2.

Reference number:

1

check valve

2

Admitting

3

Omitting

4

Flow direction

5

Locking direction

11

framework

12

inner section

13

outer section

14

Breakthrough

15

strut

16

opening

17

Jetty

18

first page

19

second page

21

Closure part

22

first end

23

second end

24

Ventilation section

25

passage

26

bead

27

Overhang

28

Area of smallest external cross-section

29

Funnel section

31

adapter

32

first end

33

second end

34

first section

35

second part

36

Support surface

37

Groove

38

inner section

39

outer section

41

attack

42

funnel-shaped section

43

outer section

44

opening

45

Breakthrough

46

strut

47

Closure piece

48

edge

49

head Start

Claims (12)

Non-return valve (1) for use on a toilet, which has between an inlet end (2) and an opposite outlet end (3) along a common longitudinal axis in this order - a sealing seat formed by a rigid frame (11) and - a closing element formed by an elastic closure part (21), wherein the frame (11) and closure part (21) are designed to match one another in the region of the sealing seat in a funnel-shaped manner and taper towards the inlet end (2), and the closure part (21) is tensioned against the frame (11) in the region of the sealing seat and held in it in a rest position of the non-return valve (1), wherein the frame (11) has openings (14) in the region of the sealing seat and the closing element is designed in one piece with a venting device, characterized in that the venting device is formed in that the closure part (21) with a venting section (24) extends in sections through an opening (16) of the frame (11) and has a passage (25) in the direction of the inlet end (2) at a distance from the frame (11). Check valve (1) after Claim 1 , characterized in that the closure part (21) is held on the frame (11) in that it rests on the frame (11) and is clamped to it by means of an undercut formed next to a bead (26) in the region which projects through the opening (16) of the frame (11). Check valve (1) according to one of the Claims 1 until 2 , characterized in that the passage (25) is formed by a non-return valve. Check valve (1) according to one of the Claims 1 until 3 , characterized in that the closure part (21) is designed such that it opens already at a pressure which corresponds to a filling level of liquid at the inlet end (2) of the check valve (1), at which the venting section (24) of the closure part (21) protrudes in sections beyond the filling level. Check valve (1) according to one of the preceding claims, characterized by an elastic adapter (31) which has a first end (32) and a second end (33) opposite along the common longitudinal axis, the adapter (31) being arranged with its first end (32) adjacent to the inlet end (2) of the check valve (1) and being arranged with its second end (33) adjacent to the frame (11). Check valve (1) after Claim 5 , characterized 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, wherein a circumferential support surface (36) is arranged between the first and the second section (34, 35), which extends transversely to the common longitudinal axis. Check valve (1) according to one of the Claims 5 until 6 , characterized in that the adapter (31) has in its second section (35) a circumferential groove (37) through 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. Check valve (1) according to one of the preceding claims, characterized 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). Check valve according to one of the preceding claims, characterized in that the frame is formed as a closure in an outer section (13) of its cross section, preferably with an internally formed screw thread. Check valve (1) according to one of the preceding claims, characterized in that it additionally has, between the closure part (21) and the outlet end (3), a stop (41) which can be locked to the frame (11) and a closure piece (47) arranged between the stop (41) and the closure part (21), wherein the stop (41) has an opening (44) in the center of its cross section and is designed to hold the closure piece (47) and to allow liquid to flow through in the direction of the outlet end (3) in a normal position of the check valve (1), 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 check valve (1) and to close the venting device in an overhead position of the check valve (1). Check valve (1) according to one of the preceding claims, characterized in that it consists of an adapter (31), a frame (11), a closure part (21), a closure piece (47) and a stop (41). Separating toilet comprising a check valve (1) according to one of the preceding claims.

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