EP1719845B1 - Flush valve for a flushing cistern - Google Patents

Description

The invention relates to a drain fitting for a cistern according to the preamble of claim 1.

A drain fitting is from the document DE 197 48 621 A1 known. In this drain fitting, the lifting device acts in the interior of the overflow pipe, wherein for selectively setting a Teilspülvorganges or Vollspülvorganges a control formed of relatively many items is provided.

In the FR 2 594 866 A1 a mechanical actuator for a cistern is described, which allows different Spülarten. This document discloses the features of the preamble of claim 1.

Finally, out of the EP 0 010 945 B1 an actuator with a float known that allows the use of buoyancy and friction effects partial or full rinses.

The invention has the object to improve the specified in the preamble of claim 1 drain fitting further and in particular the drain fitting in such a way that fewer items are required. Here it is part of the task to design the drain fitting so that it is versatile.

This object is achieved in a generic drain fitting by claim 1.

Further embodiments of the invention are specified in claims 2 to 19.

With the proposed measures, the drain valve can be considerably simplified. By the action of the lifting device on an outer bearing surface, the drain valve actuation can be mechanically, e.g. with a linkage or Bowden cable, hydraulic, e.g. with the medium of water, or preferably pneumatically, e.g. be carried out with the medium air. In this case, the engagement and disengagement of the retaining lug essentially take place during the opening process from a control shaft in communication with the lifting device.

In a further embodiment of the invention, the lifting device can be suitably formed by an axially limited slidably disposed in the valve housing of the drain valve piston which cooperates on the one hand end face with the outer contact surface of the overflow pipe and on the other hand with a formed on its lateral surface projection at least with a formed on the control shaft lever cooperates for the locking device. In the piston, for example, a bellows can be arranged, with which the piston is axially movable in the valve housing by pressing or removing a fluid.

Advantageously, the locking device can be essentially formed by a pivotable flap, which is held with a lateral axis of rotation on the valve housing, wherein on the side facing away from the axis of rotation of the flap a float is arranged, the way that the buoyancy of the float the flap so far pivots that a formed on the flap retaining lug passes under a locking projection of the overflow pipe. However, the pivotal movement of the flap is controlled by a arranged on the control shaft arm of the type that just before the end of the maximum displacement of the piston, the projection on the lever of the control shaft comes to rest and rotates the control shaft with the support arm during the remaining displacement, so that the support arm pivots away from a support surface of the flap and swings the flap by the buoyancy of the float with the retaining lug under the locking projection of the overflow pipe and thus secures the open position of the drain valve. Once the water level is in the range of the float, the buoyancy is reduced, and by the weight of the float, etc., the flap is pivoted back with the retaining lug from the position under the locking projection, so that the Dberiaufrohr falls back with the drain valve closure member in the closed position of the drain valve. Here, the control shaft is expediently designed so that it is rotated back by gravity in the direction of rotation, in which the support arm comes to rest on the support surface, so that it is ensured that in the closed position of the drain valve, the control arm the support arm back to the support surface for Plant brings and the cistern with rinse water for a new Spiälvorgang can be filled.

According to a preferred embodiment of the invention, a second lever is formed on the control shaft to the first lever, wherein the two levers are arranged approximately at right angles to each other. In addition, a retraction arm is disposed on the control shaft at an acute angle to the support arm. The two levers cooperate with the projection on the piston, while the holding arm and the Rückzieharm interact with the flap. In the acute angle between the support arm and the Rückziehal'm parallel to the support arm a one-sided held on the control shaft leaf spring is provided, which cooperates with a special locking shoulder of the flap. During the opening process of the drain valve in the final phase of the projection on the first lever, the control shaft is rotated until the support arm pivots away from the support surface and the leaf spring rests against the locking shoulder. Upon sliding back of the piston in the rest position its projection comes into contact with the second lever of the control shaft, the way that the control shaft, supported by the leaf spring, slightly rotated back in the passage of the projection and then returned by the leaf spring back to the original position , Then, after the piston has fallen into its rest position, while the butterfly valve remains in the locked position, the piston is deflected again, the projection of the piston on the second lever of the control shaft comes to rest, so that then the control shaft is rotated further and the Rückzieharm over a contact surface the flap with the retaining lug, against the buoyancy of the float, under the catch projection pulls out and the overflow pipe is released with the drain valve closure member, so that then the shut-off of the drain valve can be done and thus the flushing process is interrupted. Upon reaching the shut-off position of the overflow pipe formed in the region of the contact surface securing rib in the rear region of the support arm comes to rest, causing the control shaft, the leaf spring on the locking shoulder back, so that the support arm again comes to rest on the locking surface and the drain valve for a new flushing ready.

According to a further embodiment of the invention, at least one float is arranged on the overflow pipe. In this case, the piston can be selectively moved by the lifting device only until the abutment of the projection on the first lever of the control shaft, so that after the opening of the drain valve, the overflow pipe with the drain valve closing member of the float is kept in the open position until after the outflow a subset of rinse water, the water level has dropped so far in the cistern that the drain valve returns to the closed position. With this training, optionally, a subset of the rinsing water collected in the cistern are discharged. When dispensing a subset of the rinse water, the locking device remains switched off.

In a further embodiment of the invention, the float can preferably be fixed in height adjustable on the overflow pipe, so that the Teilspülvvassermenge is adjustable by moving the float on the overflow pipe.

In a further preferred embodiment of the invention, the overflow pipe above the contact surface may have an enlarged diameter end piece, so that this tail can also act as a float. Here, on the lateral surface of the tail expedient guide rails can be formed, on which the height-adjustable float is held. It can additionally for a finely graded shift a toothed rail to be integrally formed on the lateral surface, on which the float is latched in the respective desired altitude.

In a further embodiment of the invention, the piston and the flap can be arranged in each case in a separate chamber in the valve housing, wherein the control shaft on the one hand cooperates with the two levers with the piston, while on the other hand, the holding arm, the leaf spring and the Rückzieharm at the other end in the Chamber for the flap are arranged. The control shaft can be held in bearings in the valve housing, wherein preferably the bearings are formed so that the control shaft is radially einsprengbar. The control shaft with the levers, the retraction arm and the retaining arm with the leaf spring is advantageously made in one piece from plastic.

In a further embodiment of the invention may advantageously be the chamber for the flap as open-topped water chamber formed in the lower part has a throttle opening for a delayed water discharge, so that sinks during flushing the water level in the chamber slower than in the cistern, creating a nearly complete Emptying the cistern is made possible.

Expediently, bearings can also be formed in a wall of the chamber into which the axis of rotation of the flap can be radially inserted. In addition, advantageously, the flap with the retaining lug of the rotation axis and the float can be made in one piece from plastic.

In a further embodiment of the invention may be integrally formed on the side facing away from the flap side of the float an open-topped water collection chamber. The water present in the water collection chamber acts as additional torque on the flap after the water has flowed out of the chamber in which the flap is located.

Fig. 1

einen Teil eines Spülkastens mit einem Ablaufventil und einer Betätigungseinrichtung in Ruhepositionn, teilweise geschnitten,

Fig. 2

das in Fig. 1 gezeigte Ablaufventil in der Schnittebene II,

Fig. 3

einen in Fig. 1 gezeigten Teil III des Ablaufventils in vergrößerter Darstellung,

Fig. 4

den in Fig. 1 gezeigten Spülkasten, wobei das Ablaufventil zu einer Vollspülung geöffnet wird,

Fig. 5

einen in Fig. 4 gezeigten Teil V des Ablaufventils, wobei das Ablaufventil voll geöffnet und von einer Rastvorrichtung in Offenstellung gehalten ist,

Fig. 6

den in Fig. 5 gezeigten Teil des Ablaufventils bei einem erneuten Betätigungsvorgang, wobei ein Vorsprung an der Aushebevorrichtung an einem zweiten Hebel einer Steuerwelle anliegt,

F.g. 7

den in Fig. 6 gezeigten Teil des Ablaufventils, wobei der Vorsprung der Aushebevorrichtung über den zweiten Hebel die Steuerwelle weitergedreht hat, so dass ein Rückzieharm die Verriegelungsvorrichtung aus der Rastposition am Überlaufrohr zurückzieht und damit das Ablaufventil zu einem vorzeitigen Schließen freigibt,

Fig. 8

den in Fig. 4 gezeigten Spülkasten, wobei das Spülwasser aus dem Spülkasten abgeflossen ist und das Ablaufventil sich wieder in der Schließposition befindet, wobei die Steuerwelle von am Überlaufrohr angeordneten Sicherungsrippen in die Ausgangsdrehstellung zurückgedreht ist,

Fig. 9

einen in der Fig. 8 gezeigten Teil IX des Ablaufventils in vergrößerter Darstellung,

Fig. 10

den in Fig. 1 gezeigten Spülkasten, wobei die Aushebevorrichtung nur über einen Bereich von etwa 75% betätigt ist,

Fig. 11

einen in Fig. 10 gezeigten Teil XI des Ablaufventilsn vergrößerter Darstellung,

Fig. 12

den in Fig. 10 gezeigten Spülkasten mit rückgeführter Aushebevorrichtung,

Fig. 13

das in Fig. 1 gezeigte Überlaufrohr mit Ablaufventilverschlussglied in Perspektivansicht,

Fig. 14

as in Fig. 13 gezeigte Überlaufrohr in Seitenansicht,

Fig. 15

das in Fig. 14 gezeigte Überlaufrohr in Ansicht vo oben,

Fig. 16

den in Fig. 1 gezeigten Kolben der Aushebevorrichtung in Perspektivansicht,

Fig. 17

den in Fig. 16 gezeigten Kolben in Seitenansicht,

Fig. 18

den in Fig. 17 gezeigten Kolben in Ansicht von oben,

Fig. 19

den in Fig. 2 gezeigte Steuerwelle in Perspektivansicht,

Fig. 20

die in Fig. 19 gezeigte Steuerwelle in Seitenansicht,

Fig. 21

die in Fig. 20 gezeigte Steuerwelle um 90° gedreht,

Fig. 22

die in Fig. 1 gezeigte Klappe der Rastvorrichtung in Perspektivansicht,

Fig. 23

die in Fig. 22 gezeigte Klappe in Seitenansicht und

Fig. 24

die in Fig. 23 gezeigte Klappe in Ansicht von oben.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below. It shows in the drawing

Fig. 1

a part of a cistern with a drain valve and an actuator in rest position, partially cut,

Fig. 2

this in Fig. 1 shown drain valve in the sectional plane II,

Fig. 3

one in Fig. 1 shown part III of the drain valve in an enlarged view,

Fig. 4

the in Fig. 1 shown cistern, wherein the drain valve is opened to a full flush,

Fig. 5

one in Fig. 4 shown part V of the drain valve, wherein the drain valve is fully open and held by a locking device in the open position,

Fig. 6

the in Fig. 5 shown portion of the drain valve in a renewed operation, wherein a projection on the lifting device is applied to a second lever of a control shaft,

Fg 7

the in Fig. 6 shown portion of the drain valve, wherein the projection of the lifting device on the second lever has further rotated the control shaft, so that a retracting arm retracts the locking device from the locking position on the overflow pipe and thus releases the drain valve to a premature closing,

Fig. 8

the in Fig. 4 shown cistern, wherein the rinse water has drained from the cistern and the drain valve is again in the closed position, wherein the control shaft is rotated back from arranged on the overflow pipe securing ribs in the initial rotational position,

Fig. 9

one in the Fig. 8 shown part IX of the drain valve in an enlarged view,

Fig. 10

the in Fig. 1 shown cistern, wherein the lifting device is actuated only over a range of about 75%,

Fig. 11

one in Fig. 10 shown portion XI of the drain valve enlarged view,

Fig. 12

the in Fig. 10 shown cistern with recirculated lifting device,

Fig. 13

this in Fig. 1 shown overflow pipe with drain valve closure member in perspective view,

Fig. 14

as in Fig. 13 shown overflow pipe in side view,

Fig. 15

this in Fig. 14 shown overflow pipe in view from above,

Fig. 16

the in Fig. 1 shown plunger of the lifting device in perspective view,

Fig. 17

the in Fig. 16 shown piston in side view,

Fig. 18

the in Fig. 17 shown piston in top view,

Fig. 19

the in Fig. 2 shown control shaft in perspective view,

Fig. 20

in the Fig. 19 shown control shaft in side view,

Fig. 21

in the Fig. 20 shown control shaft rotated 90 °,

Fig. 22

in the Fig. 1 shown flap of the locking device in perspective view,

Fig. 23

in the Fig. 22 shown flap in side view and

Fig. 24

in the Fig. 23 shown flap in top view.

In the embodiment shown in the drawing, a cistern 1 with a bottom 10 and a lid 11 is shown in part. In the bottom 10, a drain valve 2 is arranged with an overflow pipe 21 and a drain valve closure member 210 formed on Überiaufrahr- 21 in an opening. At the opening in the bottom 10 of the cistern 1 is followed by a drain line 13 for the rinse water. The cistern 1 is filled via a not shown in the drawing, float-controlled inlet valve with rinse water to the water level 12. The drain valve 2 is in the closed position. The drain valve 2 has a valve housing 20, in which a lifting device 22 and a latching device 25 is arranged. The lifting device 22 is connected to a fluid line 24 with an actuator 23.

On the actuator 23, a bellows 230 is arranged, wherein the actuating device 23 is provided with a first button 231 for a Vollspülvorgang and with a second button 232 for a Teilspülvorgang. With the first button 231, the bellows 230 can be completely compressed by the user, while with the second button 232, the bellows 230 is only about 75% zusammendruckbar. The lifting device 22 is arranged with a piston 220 in a chamber 200 of the valve housing 20, wherein a bellows 221 is fastened on the one hand to the valve housing 20 and on the other hand to a partition wall 2201 of the piston 220. The bellows 221 is connected to the fluid line 24 at the housing area, so that upon compression of the bellows 230 of the actuating device 23 a corresponding expansion of the bellows 221 and thus an axial displacement of the piston 220 in the chamber 200 is caused. The piston 220 cooperates with its protruding end face with a contact surface 212 on the overflow pipe 21. In addition, on the lateral surface of the piston 220 a radial projection 2200 is formed, which cooperates with levers 2501,2502 on a control shaft 250.

The control shaft 250 carries at one end the two offset by about 90 ° to each other formed lever 2501, 2502 and at the other end a holding arm 2503 and an acute angle to the support arm 2503 integrally formed retraction arm 2505. At an acute angle between the retraction arm 2505 and the arm 2503 is parallel to the holding arm 2503, a leaf spring 2504 integrally formed with an end portion on the control shaft 250. The retaining arm 2503, the leaf spring 2504 and the retraction arm 2505 cooperate with a flap 251 of the latching device 25 arranged in a chamber 201 of the valve housing 20. The control shaft 250 is arranged in bearings 202 of the valve housing 20. Here, the bearings 202 are formed so that the control shaft 250 can be radially blasted into the bearings 202. The control shaft 250 with the levers 2501, 2502, the holding arm 2503, the leaf spring 2504, and the retraction arm 2505 is integrally made of plastic by injection molding.

The flap 251 of the latching device 25 carries on the one hand a projecting from the flap 251 axis of rotation 2511 with which it is mounted in the bearing 2010 of the valve housing 20 radially snap-in and pivot. On the flap 251 also a retaining lug 2512 is formed, which cooperates with a latching projection 211 of the overflow pipe 21.

On the side opposite the axis of rotation 2511 side of the flap 251, a float 2510 is formed, as in particular FIGS. 22 and 23 the drawing can be seen. On the outside of the float 2510 also a water collection chamber 2516 is formed. On the flap 251, a region of the water collecting chamber 2516 is integrally formed on the outer region of a support surface 2513 for the support arm 2503. In addition, a locking shoulder 2514 for the leaf spring 2504 and a contact surface 2515 for the retraction arm 2505 on one side of the water collecting chamber 2516 is formed. The flap 251 with the float 2510, the rotation axis 2511 and the retaining lug 2512 as well as the water collection chamber 2516 and the support surface 2513, locking shoulder 2514 and the contact surface 2515 is integrally made of plastic by injection molding

The overflow pipe 21 is provided with an enlarged diameter end piece 214 above the abutment surface 212, as it is made FIGS. 1 and 13 to 15 the drawing can be seen. On the tail 214 can still be plugged 215 extension. On the outer casing of the end piece 214, two guide rails 2140 are formed parallel to the central axis, of which a float 213 is accommodated and is arranged to be axially displaceable relative to the end piece 214. For latching in the different axial positions also a toothed rail 2141 is integrally formed on the lateral surface of the end piece 214. In the region of the contact surface 212 of the overflow pipe 21 also securing ribs 2120 are formed, which ensure the return of the control shaft 250 in the closed position of the drain valve 2, so that the control shaft 250 assumes the required rotational position for the initiation of a flushing operation.

The drain fitting described above has the following operation:

Is the user the first key 231 of the in Fig. 1 the position shown in the drawing, in which the cistern is filled up to the water level 12 with rinse water, actuated, the bellows 230 is completely compressed, as it out Fig. 4 the drawing can be seen. The displaced fluid quantity or amount of air is supplied via the fluid line 24 to the bellows 221 of the lifting device 22. The bellows 221 thereby expands axially and thereby moves the piston 220 with its front side, adjacent to the contact surface 212 of the overflow pipe 21, upwards, so that the overflow pipe 21 is lifted with the drain valve closure member 210 from the valve seat of the drain valve 2 and the rinse water the cistern in a drain line 13 for flushing, eg a toilet flows. In the end region of the axial movement of the piston 220, the projection 2200 abuts against the first lever 2501 of the control shaft 250 and rotates the control shaft 250 so far that the support arm 2503 is pivoted away from its support surface 2513 in the area of the water collection chamber 2516, so that the water in the chamber 201 of the valve housing 20 by means of the float 2510 pivots the flap 251 with the retaining lug 2512 under the latching projection 211 of the overflow pipe 21 the overflow tube 21 is locked to the drain valve closure member 210 in the open position, as is evident in particular Fig. 5 the drawing can be seen. In this case, the leaf spring 2504 comes to rest on the latching shoulder 2514.

After actuation of the button 231, the bellows 230 is returned from its compressed position by spring force back to its rest position. In the process, the water level 12 in the cistern 1 continuously drops, as happens Fig. 8 the drawing can be seen. The water in the chamber 201 flows through a throttle opening, not shown in the drawing delayed in the cistern 1, so that a nearly complete emptying of the cistern is reachable. If the buoyancy of the float 2510 decreases, the flap 251 is pivoted back by its own weight and the weight of the water located in the water collecting chamber 2516, so that the retaining lug 2512 is withdrawn under the latching projection 211. The overflow tube 21 is thus released, so that it falls back by gravity with the drain valve closure member 210 in the closed position. In this case, the control shaft 250 is rotated back by the securing rib 2120, so that the leaf spring 2504 is returned via the latching shoulder 2514 and the holding arm 2503 abuts the support surface 2513 again. Thereafter, the cistern on a not shown in the drawing float valve back to a in Fig. 1 shown water level 12 are filled.

However, if the key 231 is again actuated during the outflow of the rinsing water from the cistern 1, the projection 2200 comes into contact with the second lever 2502 of the control shaft 250 during the axial displacement of the piston 220, since the control shaft is held in this rotational position by the leaf spring 2504 becomes. By re-pressing, as it in particular FIGS. 6 and 7 As can be seen from the drawing, the control shaft 250 is rotated further, so that the retraction arm 2505 abuts against the abutment surface 2515 and the flap 251 is pivoted back against the buoyancy of the float 2510, the retaining lug 2512 pivoted away from the detent projection 211 of the overflow tube 21 is, so that the overrun rahr 21 with the Ablaufventilver-schlußglied 210 for the shut-off of the drain valve 2 is released immediately. With a second actuation of the button 231 thus the full rinse can be interrupted by the user. The torque applied by the force of gravity to the control shaft 250 rotates the control shaft 250 after the second operation, wherein the locking rib 2120 formed in the area of the abutment surface 212 causes the remaining rotation of the control shaft 250 to return the leaf spring 2504 via the detent switches 2514, so that the Output rotational position of the control shaft 250 is reached again, in which the holding arm 2503 rests against the support surface 2513, as in Fig. 1 the drawing is shown.

In contrast, in the in Fig. 1 shown cistern 1, the button 232 operated by the user, so the bellows 230 can only compress about 75%. The ver-urged amount of air in turn passes through the fluid line 24 in the bellows 221 of the lifting device 22. In this case, the piston 220 obtains a lower height because of the smaller amount of air and reaches maximum with its projection 2200 to near the first lever 2501, without the control shaft 250 to move. However, the overflow tube 21 with the drain valve closure member 210 is already in the open position of the drain valve 2, wherein the overflow tube is held by a float 213 in the open position. Once the water level 12 has dropped sufficiently in the cistern 1, the drain valve closure member 210 returns to its closed position. With the actuation of the key 232, a partial flushing amount can thus be dispensed from the cistern 1.

The partial flushing amount can be adjusted via the height or axial position of the float 213 on the end piece 214 of the overflow pipe 21. It can with the help of a toothed rail 2141, at which the float 213 in the different Axial positions can be locked, finely graded settings are made.

Claims (19)

1. Outlet valve fitting for a flushing cistern, containing an outlet valve (2), an overflow pipe (21) having an outlet valve closure member (210) and an actuating device (23) with a lifting device (22) for opening the outlet valve (2), there being provided a locking device (25) for keeping the outlet valve (2) open during the emptying operation, which locking device (25) is controlled by a float (2510), and a control shaft (250), wherein during the opening operation the lifting device (22) is in contact with an external contact face (212) of the overflow pipe (21) and acts in parallel on at least one lever (2501, 2502) of the control shaft (250) to engage and disengage a retaining lug (2512) of the locking device (25) in the overflow pipe (21) when the outlet valve (2) is in the open position, characterised in that the lifting device (22) is formed by a piston (220) which is mounted in a valve housing (20) of the outlet valve (2) so as to be capable of limited displacement parallel to the overflow pipe (21), the piston (220) having on its outer wall a projection (2200) which acts on the at least one lever (2501, 2502).
2. Outlet valve fitting according to claim 1, characterised in that the locking device (25) contains a flap (251) rotatable by a float (2510), which flap (251) is mounted on the outlet valve (2) by means of a lateral hinge pin (2511), and which has a retaining lug (2512), which is pivotable radially by the buoyancy of the float (2510) to a position under a locking projection (211) of the overflow pipe (21), the pivoting movement of the flap (251) being blockable or unblockable, in dependence upon the pivoted position, by a retaining arm (2503) arranged on the control shaft (250), which retaining arm (2503) co-operates with a support face (2513) on the flap (251).
3. Outlet valve fitting according to claim 2, characterised in that the projection (2200) on the piston (220) is positioned so that, shortly before the end of the maximum displacement path, it makes contact with the lever (2501) of the control shaft (250) and pivots the retaining arm (2503) away from the support face (2513).
4. Outlet valve fitting according to at least one of claims 2 and 3, characterised in that the control shaft (250) is constructed so that gravity generates a turning moment in the direction towards the rest position in which the retaining arm (2503) makes contact with the support face (2513).
5. Outlet valve according to at least one of claims 2 to 4, characterised in that a second lever (2502) to the first lever (2501) is formed on the control shaft (250), the two levers (2501, 2502) being arranged approximately at right-angles to one another, and a return arm (2505) is arranged on the control shaft (250) at an acute angle to the retaining arm (2503), there being formed in the acute angle, parallel to the retaining arm (2503), a leaf spring (2504) which, by means of its free end region, co-operates with a locking shoulder (2514) on the flap (251) in such a way that, after the control shaft (250) has been rotated by means of the first lever (2501), the leaf spring (2504) makes contact with the locking shoulder (2514) and prevents back-rotation, so that in the event of a second axial movement of the piston (220) the projection (2200) makes contact with the second lever (2502) and the control shaft (250), by means of its return arm (2505), by way of a contact face (2515) pulls the flap (251) with its retaining lug (2512) out from under the locking projection (211) against the buoyancy of the float (2510) and thus prematurely initiates the closing movement of the outlet valve (2), there being provided on the overflow pipe (21) means which, during the closing operation of the outlet valve (2), act on the control shaft (250) in such a way that the leaf spring (2504) is returned to a position above the locking shoulder (2514) and the retaining arm (2503) is moved into contact with the support face (2513).
6. Outlet valve according to at least one of the preceding claims, characterised in that at least one float (213) is arranged on the overflow pipe (21), and the piston (220) is movable, as desired, at most only until the projection (2200) makes contact with the lever (2501) of the control shaft (250), so that after the outlet valve (2) has been opened the overflow pipe (21) with the outlet valve closure member (210) is kept in the open position by the float (213) until, once a sub-quantity of flushing water has flowed out, the water level (12) in the flushing cistern (1) has sunk to a level such that the outlet valve (2) is closed again.
7. Outlet valve according to claim 6, characterised in that the float (213) is fixed to the overflow pipe (21) so as to be axially displaceable for determining a desired sub-quantity of flushing water.
8. Outlet valve fitting according to at least one of the preceding claims, characterised in that the overflow pipe (21), above the contact face (212), is provided with an end piece (214) of enlarged diameter, so that the end piece (214) additionally acts as a float.
9. Outlet valve fitting according to claim 8, characterised in that guide rails (2140) are formed on the outer wall of the end piece (214), on which guide rails (2140) a height-adjustable float (213) is mounted.
10. Outlet valve fitting according to claim 9, characterised in that a toothed rail (2141) is formed integrally with the outer wall of the end piece (214), on which toothed rail (2141) the float (213) is height-adjustably locked in place.
11. Outlet valve fitting according to at least one of the preceding claims, characterised in that the piston (220) and the flap (251) are each arranged in a chamber (200, 201) in the valve housing (20) of the outlet valve (2), wherein the levers (2501, 2502) are arranged on one end region and the return arm (2505) and the retaining arm (2503) with the leaf spring (2504) are arranged on the other end region of the control shaft (250), and the control shaft (250) is mounted in the valve housing (20) by means of bearings (202).
12. Outlet valve fitting according to claim 11, characterised in that the bearings (202) are constructed so that the control shaft (250) can be snapped in radially.
13. Outlet valve fitting according to claims 2 and 5, characterised in that the control shaft (250) with the levers (2501, 2502) and the return arm (2505) and the retaining arm (2503) with the leaf spring (2504) is made in one piece from plastics material.
14. Outlet valve fitting according to claims 2 and 11, characterised in that the chamber (201) for the flap (251) is in the form of a water chamber which is open at the top and which has in its lower region a throttle opening for delayed water outflow, so that during a flushing operation the water level (12) sinks more slowly in the chamber than in the flushing cistern.
15. Outlet valve fitting according to claims 2 and 11 or according to claim 14, characterised in that bearings (2010) are formed in a wall of the chamber (201), into which bearings (2010) the hinge pin (2511) of the flap (251) can be snapped radially.
16. Outlet valve fitting according to at least one of claims 2 to 5 and 13 to 15, characterised in that the float (2510) is formed on the flap (251) on the side thereof opposite the hinge pin (2511).
17. Outlet valve fitting according to at least one of claims 2 to 5 and 13 to 16, characterised in that the flap (251) with the retaining lug (2512), the hinge pin (2511) and the float (2510) is made in one piece from plastics material.
18. Outlet valve fitting according to claims 2 and 11, characterised in that on the side of the float (2510) remote from the flap (251) there is formed a water chamber (2516) which is open at the top and the water in which additionally applies a load to the flap (251) on one side when the water has flowed out of the chamber (201).
19. Outlet valve fitting according to at least one of claims 2 to 5 and 13 to 18, characterised in that, as resetting and securing means, there are formed integrally with the contact face (212) perpendicularly projecting securing ribs (2120) the length of which is such that, when the outlet valve (2) is closed, the retaining arm (2503) is, by means of its end region, in contact with the support face (2513) and the flap (251) with its retaining lug (2512) has been pivoted away from the locking projection (211).

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