AU2018236847A1

AU2018236847A1 - Drain fitting

Info

Publication number: AU2018236847A1
Application number: AU2018236847A
Authority: AU
Inventors: Alfred Mahler
Original assignee: Geberit International AG
Current assignee: Geberit International AG
Priority date: 2017-10-05
Filing date: 2018-09-28
Publication date: 2019-05-02
Anticipated expiration: 2038-09-28
Also published as: CN109629647A; EP3467215B1; CN109629647B; PL3467215T3; DK3467215T3; AU2018236847B2; EP3467215A1; PT3467215T

Abstract

A drain fitting (1) for a flushing cistern comprises a housing (2) with a housing wall (3) which has a surface (4) on the outside, and a valve body (5), movably mounted in the 5 housing (2), with a float (6), wherein the valve body (5) can be moved along a centre axis (M) from an inoperative position to a flushing position and from the flushing position to the inoperative position, wherein the float (6) can be moved along the centre axis (M) inside a float chamber (7), which is delimited by the housing (2), and works hydraulically in conjunction with the float chamber (7), wherein the float chamber (7) comprises at least 10 one control passage (8) for controlling a first flushing quantity, by means of which, as soon as a flushing water level (S) surrounding the drain fitting (1) has dropped to the height of the control passage (8), air can enter the float chamber (7) from regions (9) outside the float chamber (7) in such a way that the pressure ratios between the float chamber (7) and the regions (9) outside the float chamber (7) can be balanced, wherein with balance of the 15 pressure ratios the float (6) can be moved from the flushing position to the inoperative position, wherein the drain fitting (1) also comprises a control unit (10) with a closing weight (12), which is adjustable in its height position, for controlling a second flushing quantity, wherein the closing weight (12), during initiation of the second flushing quantity, effects a closing force upon the valve body (5), and wherein the closing weight (12) is 20 movably arranged outside the housing (2) laterally to the surface (4) and relative to said surface (4), wherein the drain fitting (1) also comprises a fluidically or electrically operable actuator (11) by means of which the valve body (5) can be lifted from the inoperative position into the flushing position, and wherein the actuator (11) is arranged laterally to the surface (4) and, as seen with regard to the centre axis (M), opposite the closing weight (12) 25 which is arranged outside the housing (2). (Fig. 1) 29 K 1116 10 "14 -B 30 12 -E 17,18 20 15Z 27 7 6 22 FIG. 1

Description

DRAIN FITTING

TECHNICAL FIELD

The present invention relates to a drain fitting for a flushing cistern according to Claim 1.

PRIOR ART

Drain fittings for flushing cisterns have been known from the prior art. For example, EP 0 890 680 discloses a drain fitting which is operated by a pneumatic lifter.

SUMMARY OF THE INVENTION

Starting from the present prior art, it is a preferred object of the present invention to provide a drain fitting which by an operation with a fluidically or electrically operable actuator for a partial-quantity flushing has an adjustment range which is as large as possible and is still of compact design.

The subject matter according to Claim 1 achieves this object. According to this, a drain fitting for a flushing cistern comprises a housing with a housing wall, which on the outer side has a surface, and a valve body, movably mounted in the housing, with a float, wherein the valve body can be moved along a centre axis from an inoperative position to a flushing position and from the flushing position to the inoperative position. The float can be moved along the centre axis inside a float chamber which is delimited by the housing and works hydraulically in conjunction with the float chamber. The float chamber comprises at least one control passage for controlling a first flushing quantity by means of which, as soon as a flushing water level surrounding the drain fitting has dropped to the height of the control passage, air can enter the float chamber from regions outside the float chamber in such a way that the pressure ratios between the float chamber and the regions outside the float chamber can be balanced, wherein with balance of the pressure ratios the float can be moved from the flushing position to the inoperative position. The drain fitting also comprises a control unit with a closing weight for controlling a second flushing quantity, wherein the closing weight, during initiation of the second flushing quantity, effects a closing force upon the valve body and wherein the closing weight is movably arranged outside the housing laterally to the surface and relative to said surface. The closing weight is designed with adjustment capability in its height position. On account of this adjustment, the quantity of the second flushing can be set. Furthermore, the drain fitting comprises a fluidically or electrically operable actuator by means of which the valve body can be lifted from the inoperative position into the flushing position. The actuator is arranged laterally to the surface and, as seen with regard to the centre axis, opposite the closing weight which is arranged outside the housing.

In other words, this means that the elements which lie outside the housing, namely the actuator and the closing weight, lie opposite each other with regard to the centre axis. The closing weight in this case lies on one side of the housing and the actuator lies on the other side of the housing. As a result of this, the effect of the height position of the closing weight being able to be adjusted without collision with the actuator is achieved. The adjustment range of the closing weight in the upward direction is therefore increased.

The actuator and the closing weight preferably lie diametrically in relation to each other or opposite each other with regard to the centre axis or the housing.

The function of the closing weight is defined to the effect that its buoyancy in the water is omitted when the water level drops below the closing weight and the total weight force acts upon the valve body. The closing weight, during corresponding operation, is in this case in connection with the valve body in such a way that the weight force can be transmitted to the valve body. The closing weight can preferably be temporarily connected to the valve body.

The surface, in the region in which the actuator comes to lie, especially preferably has a slight recess so that the compactness can be further increased.

The actuator and the closing weight preferably lie exclusively between two limiting planes which lie parallel to each other, which limiting planes extend parallel to the centre axis and through the maximum extent of the surface which delimits the float chamber. In other words, it can be said that in consideration of the drain fitting seen from the top in the direction of the centre axis two straight lines, which are spaced apart and orientated at right angles to the centre axis, are defined and extend through the maximum extent of the surface which delimits the float chamber, wherein the actuator and the closing weight lie exclusively between the two straight lines.

As a result of this, a drain fitting which fits easily into a flushing cistern can be provided. That is to say, as seen with regard to the width of the flushing cistern no elements of the drain fitting project further than a dimension which is predetermined by the maximum extent of the float chamber.

The actuator is preferably designed exclusively for lifting the valve body, but not for holding the valve body in the flushing position, wherein the valve body is held in the flushing position on account of the hydraulic equilibrium in the float chamber. The movement from the flushing position to the closing position is achieved either as a result of air entry into the float chamber or by the action of the control unit with the closing weight.

As a result of this, the advantages arise that the movement of the actuator does not have to be controlled timewise but the actuator is operated during initiation of the flushing and can then be returned to the inoperative position, or that the drain fitting can be moved as such from the flushing position into the closed position even in the event of failure of the actuator. Furthermore, the advantage arises that the drain fitting can be operated as such, that is to say even without the actuator. With regard to this, the drain fitting especially preferably has a pull element, such as a pull yoke, on the valve body and/or on the control unit via which the valve body can be lifted.

For the first flushing quantity, the actuator preferably acts directly upon the valve body which can be lifted directly by means of the actuator. For the second flushing quantity, the actuator then acts indirectly via the control unit upon the valve body which can be lifted indirectly via the control unit by means of the actuator. With lifting of the control unit, the valve body and the closing weight are lifted at the same time.

During operation, the closing weight can preferably be moved along the surface in the direction of the centre axis from an inoperative position to a flushing position over a movement range, wherein the movement range of the closing weight preferably extends to a height position in which the actuator lies in such a way that the closing weight can be moved to a height position in which the actuator lies.

The movement range therefore projects up to the height position of the actuator. The arrangement according to the invention is particularly advantageous in this connection because a collision with the actuator can occur.

The closing weight is preferably designed adjustably in its height over an adjustment range, wherein the adjustment range of the closing weight preferably extends to a height position in which the actuator lies in such a way that the closing weight can be displaced to a height position in which the actuator lies. The arrangement according to the invention is also advantageous in this connection because the adjustment range is very much greater and also extends especially to a height in which the actuator lies. The higher up the closing weight lies, the less water is extracted from the flushing cistern. The adjustment range preferably extends along the surface downward up to the height of the float chamber, especially up to at least a height region in which the uppermost control passage lies.

The control unit preferably also comprises a bearing rod which is arranged outside the housing, wherein the closing weight is fixedly mounted on the bearing rod or adjustably mounted relative to the bearing rod. The bearing rod preferably extends from a height position in which the actuator lies downwards in the direction of the float chamber, especially to a height position beneath the uppermost control passage. The bearing rod lies on the same side as the closing weight, specifically diametrically to or opposite the actuator with regard to the centre axis.

The closing weight can preferably be mechanically connected via a switching element to the valve body, wherein the switching element automatically enters into a latching connection with the valve body during the lifting of the control unit. When a water level which is provided for the second flushing quantity is reached, the closing weight provides a closing force on the valve body, which closing force is applied to the valve body via the switching via the switching element to the valve body.

The switching element is preferably mounted on the bearing rod.

The bearing rod is preferably lifted by the actuator, while the bearing rod acts upon the valve body via a driver and also lifts this.

The actuator preferably has a first actuator lever and a second actuator lever, wherein the first actuator lever acts upon the valve body and wherein the second actuator lever acts upon the control unit, especially upon the bearing rod.

The stroke of the first actuator lever is preferably different to the stroke of the second actuator lever.

The connection between the actuator lever and the valve body and the control unit, respectively, is preferably such that the valve body and the control unit, respectively, can be lifted even without operating the actuator lever. The valve body or the control unit, especially the rod, especially preferably have in each case a corresponding shoulder upon which the corresponding actuator lever acts from the bottom.

The actuator is preferably a pneumatic actuator with two pistons, especially reciprocating pistons, arranged one above the other, or with at least one bellows. Each piston is preferably in contact with one actuator lever each.

The pistons can preferably be moved along a common piston axis, wherein the piston axis extends parallel to the centre axis. The piston axis is preferably as close as possible to the centre axis, that is to say at a small distance, so that the overall size is reduced.

The surface preferably has at least one receiving element and the actuator has at least one latching element, wherein the latching element engages in the receiving element in such a way that the actuator can be connected to the housing via a latching connection. The receiving element is preferably formed integrally on the surface. The receiving element preferably lies above the float chamber.

The actuator preferably lies exclusively above the float chamber or above the uppermost control passage. This arrangement is advantageous because beneath the actuator the cross section of the float chamber can extend into regions beneath the actuator as seen laterally to the centre axis.

The first flushing is preferably a total-quantity flushing and the second flushing is a partial-quantity flushing; or the first flushing is a partial-quantity flushing and the second flushing is a total-quantity flushing. A plurality of control passages are preferably arranged at different height positions, wherein the drain fitting also comprises at least one closing element by means of which one of the control passages can be opened and the other of the control passages can be closed.

The adjustment range of the closing weight in its height preferably extends at least up to beneath the uppermost control passage.

Further embodiments are disclosed in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the invention are described in the following text with reference to the drawings which serve purely for explanation and are not to be interpreted as being limiting. In the drawings:

Fig. 1 shows a perspective view of a drain fitting according to an embodiment of the present invention, with the actuator disconnected;

Fig. 2 shows a side view of the drain fitting according to Figure 1;

Fig. 3 shows a perspective view of the drain fitting according to Figure 1, with the actuator connected;

Figs. 4/5 show side views of the drain fitting according to the preceding figures during initiation of a partial quantity flushing; and

Figs. 6/7 show side views of the drain fitting according to the preceding figures during initiation of a total quantity flushing.

DESCRIPTION OF PREFERRED EMBODIMENTS

Shown in the figures is a drain fitting 1 for a flushing cistern. The general construction of the drain fitting 1 is explained in greater detail with reference to Figures 1 to 3. The principle of operation of the drain fitting 1 is then explained further down with reference to Figures 4 to 7.

The drain fitting 1 comprises a housing 2, with a housing wall 3 which on the outer side has a surface 4, and a valve body 5 which is movably mounted in the housing 2. The surface 4 delimits the housing wall 3 on the outer side and forms the outer surface of the housing wall 3.

The valve body 5 comprises a float 6 and can be moved along a centre axis M from an inoperative position to a flushing position and from the flushing position to the inoperative position. The valve body also comprises a sealing element 21 which works in conjunction with a valve seat 22. In the inoperative position, the sealing element 21 rests on the valve seat 22 in such a way that no water flows out of the flushing cistern. In the flushing position, the sealing element 21 lies at a distance to the valve seat 22 and water can flow out of the flushing cistern. The valve seat 22 in this case is part of a retaining element 28 in which the housing 2 is mounted and which can be connected, especially plugged in, to a drain opening of a flushing cistern.

The float 6 can move inside a float chamber 7 which is delimited by the housing 2. In this case, the float 6 moves along the centre axis M. The float 6 also works hydraulically in conjunction with the float chamber 7. The float chamber 7 is designed in the main as a chamber which is closed towards the top and during a movement from the inoperative position to the flushing position a hydraulic equilibrium between float 6 and float chamber 7 is created, wherein the valve body 5 is then held in the flushing position on account of this equilibrium.

The float chamber 7 comprises at least one control passage 8. In the depicted embodiment, a plurality of control passages 8 are arranged at different height positions. By means of the at least one control passage 8 air from regions 9 outside the float chamber 7 can enter said float chamber 7 if a water level S surrounding the drain fitting 1 has dropped to the height of the corresponding control passage 8. As a result of the air entry, the pressure ratios between the float chamber and the regions 9 outside the float chamber 7 are balanced and as a result of this the hydraulic equilibrium inside the float chamber 7 is disturbed and with balance of the pressure ratios the float 6 and also the valve body 5 are moved from the flushing position to the inoperative position. As a result of this, a first flushing quantity can be controlled.

The drain fitting 1 also comprises a control unit 10 with a closing weight 12 which can be adjusted in its height position. The control unit 10 serves for controlling a second flushing quantity. The closing weight 12 effects a closing force upon the valve body 5 during initiation of the second flushing quantity. That is to say, the closing weight 12 is temporarily mechanically connected to the valve body so that the weight force of the closing weight 12 can be transferred to the valve body 5. In the depicted embodiment, the closing weight 12 is movably arranged outside the housing 2 laterally to the surface 4 and relative to said surface 4. With an operation of the control unit 10, the closing weight 12 is lifted and connected to the valve body 5.

The drain fitting 1 also comprises a fluidically or electrically operable actuator 11. By means of the actuator 11 the valve body 5 can be lifted from the inoperative position into the flushing position. A direct and/or indirect lifting, which is explained in more detail further down, is possible in this case. The actuator 11 is arranged laterally to the surface 4 and, as seen with regard to the centre axis M, opposite the closing weight 12 which is arranged outside the housing 2. That is to say, the actuator and the closing weight 12 lie outside the surface 4 diametrically opposite each other as seen with regard to the centre axis M. With a movement of the closing weight 12 along the centre axis M, a collision between actuator 11 and closing weight 12 does not occur on account of the oppositely disposed arrangement of the actuator 11. The closing weight 12 can therefore move to a height position at which the actuator 11 is arranged. In the depicted embodiment, the surface 4 has a recess 30 which reduces the cross section of the housing 2 so that the compactness can be increased.

The diametrically opposite arrangement of the actuator 11 with regard to the closing weight 12 has, moreover, the particular advantage that the drain fitting can be of a comparatively compact design. This is of great advantage particularly during the installation of the drain fitting 1 into a flushing cistern.

The actuator 11 and the closing weight 12 preferably lie between two limiting planes Z which lie parallel to each other. The limiting planes Z extend essentially parallel to the centre axis M and are preferably equidistant to the centre axis M in each case. The distance in this case is preferably selected so that the limiting planes Z extend through the maximum extent of the surface 4 which delimits the float chamber 7. The maximum extent and therefore the positional point of the limiting plane is marked in Figure 3 by an X.

In the depicted embodiment, the actuator 11 is designed so that this serves exclusively for lifting the valve body 5. The valve body 5 is thereby held in the flushing position not by the actuator 11 but as a result of the interaction between float 6 and float chamber 7. That is to say, the valve body 5 is held in the flushing position on account of the hydraulic equilibrium in the float chamber 7. For the movement from the flushing position to the inoperative position, the above-described elements, namely the flow passage 8 and the closing weight 12, are responsible.

In the depicted embodiment, the actuator 11 acts directly upon the valve body 5 for the first flushing quantity. For this, the actuator 11 has an actuator lever 15 which works in conjunction with an edge 23 on the valve body 5 and acts upon this edge 23 seen counter to the gravity force from below and so moves the valve body 5 from the inoperative position to the flushing position. Shown in Figure 6 is the initial position in which the actuator lever 15 lies at a distance to the edge 23. After operation, the actuator lever 15 travels upwards and in the process comes up against the edge 23 and via said edge 23 lifts the valve body 5. This is shown in Figure 7.

In the depicted embodiment, the actuator 11 also works in conjunction with the control unit 10 for the second flushing quantity. For this, the actuator 11 has a second actuator lever 16 which in the depicted embodiment acts upon a driver 24 which projects from the control unit 10, in this case from the bearing rod 13. Shown in Figures 4 and 5 is the interaction between the second actuator lever 16, the driver 24 and the edge 23. In the depicted embodiment, the driver 24 projects past the valve body, laterally to said valve body 5, and comes to lie within the effective range of the second actuator lever 16. The driver 24 in this case lies beneath the edge 23. The initial position is shown in Figure 4, wherein in this case the second actuator lever 16 is in contact with the driver 24. During a lifting of the driver 24 by means of the second actuator lever 16, the driver 24 strikes the edge 23 of the valve body 5 and therefore lifts the valve body 5 from the inoperative position into the flushing position. This is shown in Figure 5. The actuator 11 therefore acts by the second actuator lever 16 indirectly on the valve body via the control unit 10.

In the depicted embodiment, the control unit 10 also comprises a bearing rod 13 which is arranged outside the housing 2. The bearing rod 13 serves in the main for bearing of the closing weight 12 which in this case is formed on the bearing rod 13 with adjustment capability relative the bearing rod 13. That is to say, the closing weight 12 can be adjusted in its height position over an adjustment range E, as a result of which the flushing quantity which is to be extracted from the flushing cistern can be adjusted. The higher the closing weight 12 lies, the smaller is the flushing water quantity which is to be extracted from the flushing cistern. The adjustment range E preferably extends with regard to its height position right into the region opposite the actuator 11. That is to say, the closing weight 12 can be moved to a height position which lies opposite the actuator 11. A further advantage of the diametrically opposite arrangement between closing weight 12 and actuator 11 is apparent here because the adjustment range of the height position of the closing weight 12 can reach right up to the height of the actuator 11 and therefore the range of the quantity of flushing water during the second flushing can be increased by adjustment.

The closing weight 12 can be mechanically and temporarily connected to the valve body 5 via a switching element 14. The switching element 14 therefore provides a temporary mechanical connection between the closing weight 12 and the valve body 5. In this case, the switching element 14 automatically enters into a latching connection with the valve body 5 during the lifting of the control unit 10. The switching element 14 is preferably mounted on the bearing rod 13 in an articulated manner and during the movement of the control unit 10, including the bearing rod 13, from the inoperative position to the flushing position is connected to the valve body 5. Via this connection, the force then acts upon the valve body 5.

In the depicted embodiment, both the valve body 5 and the control unit 10, in the region of the upper end of the bearing rod 13 in this case, each comprise a pull yoke 25, 26. Via these pull yokes, it is possible to operate the drain fitting without the availability of the actuator 11.

In the depicted embodiment, the actuator 11 can be connected to the housing 2 via a latching connection. For this, the surface 4 has a receiving structure 19 in the upper region and the actuator 11 has at least one latching element 20 which engages in the receiving structure 19. The latching element 20 engages in the receiving structure 19 in this case in such a way that the actuator can be releasably connected to the housing 2. The receiving structure 19 lies diametrically opposite the closing weight 12 with regard to the centre axis M.

As is shown from Figures 4 to 7, the actuator 11 is a pneumatic actuator with two pistons 17, 18 which are arranged one above the other. The pistons 17, 18 lie on a common piston axis K and are supplied with air via air lines 29 so that a movement of the pistons 17, 18 is enabled.

Shown in Figures 4 and 5 is the initiation of the partial-quantity flushing. In Figure 4, the valve body 5 is in its inoperative position, wherein the sealing element 21 rests upon the valve seat 22. In Figure 5, the valve body 5 is in its flushing position, wherein the sealing element 21 lies at a distance to the valve seat 22. With operation of the actuator 11, the piston 18 correspondingly extends and the control unit 10 is lifted via the second actuator lever 16. On account of the driver 24, moreover, the valve body 5 is also lifted. Water can then flow out of the flushing cistern and the water level drops. As soon as the water level has reached the closing weight 12, its buoyancy is eliminated and its gravity force becomes effective and presses the valve body 5 downwards.

With regard to the operation of the piston 18, it is to be noted that this is an operation of short duration and mainly serves for lifting the valve body 5 into its flushing position. As soon as the flushing position is reached, the actuator 11 together with the piston 18 returns to its initial position.

Shown now in Figures 6 and 7 is the initiation of a total-quantity flush. In this case, the first piston 17 is operated and the first actuator lever 15, which in this case acts directly upon the edge 23 of the valve seat 22, is moved upwards. During this, the valve body 5 then remains in its flushing position. As a soon as the water level has dropped to the height of the control passage, the hydraulic equilibrium inside the float chamber 7 is broken down and the valve body 5 moves back from the flushing position to the inoperative position.

In the depicted embodiment, a plurality of control passages 8 are arranged at different height positions. The drain fitting 1 also comprises a closing element 27 by means of which the control passages can be selectively covered.

LIST OF REFERENCE SIGNS 1 Drain fitting 2 Housing 3 Housing wall 4 Surface 5 Valve body 6 Float 7 Float chamber 8 Control passage 9 Regions outside the float chamber 10 Control unit 11 Actuator 12 Closing weight 13 Bearing rod 14 Switching element 15 First actuator lever 16 Second actuator lever 17 First piston 18 Second piston 19 Receiving element 20 Latching element 21 Sealing element 22 Valve seat 23 Edge 24 Driver 25 Pull yoke 26 Pull yoke 27 Closing element 28 Retaining element 29 Air lines 30 Recess K Piston axis M Centre axis B Movement range E Adjustment range Z Reference plane

X Positional point of reference plane Z

Claims

PATENT CLAIMS

1. Drain fitting (1) for a flushing cistern, comprising a housing (2) with a housing wall (3) which has a surface (4) on the outside, and a valve body (5), movably mounted in the housing (2), with a float (6), wherein the valve body (5) can be moved along a centre axis (M) from an inoperative position to a flushing position and from the flushing position to the inoperative position, wherein the float (6) can be moved along the centre axis (M) inside a float chamber (7), which is delimited by the housing (2), and works hydraulically in conjunction with the float chamber (7), wherein the float chamber (7) comprises at least one control passage (8) for controlling a first flushing quantity, by means of which, as soon as a flushing water level (S) surrounding the drain fitting (1) has dropped to the height of the control passage (8), air can enter the float chamber (7) from regions (9) outside the float chamber (7) in such a way that the pressure ratios between the float chamber (7) and the regions (9) outside the float chamber (7) can be balanced, wherein with balance of the pressure ratios the float (6) can be moved from the flushing position to the inoperative position, wherein the drain fitting (1) further comprises a control unit (10) with a closing weight (12), which is adjustable in its height position, for controlling a second flushing quantity, wherein the closing weight (12), during initiation of the second flushing quantity, effects a closing force upon the valve body (5), and wherein the closing weight (12) is movably arranged outside the housing (2) laterally to the surface (4) and relative to said surface (4), wherein the drain fitting (1) also comprises a fluidically or electrically operable actuator (11) by means of which the valve body (5) can be lifted from the inoperative position into the flushing position, and wherein the actuator (11) is arranged laterally to the surface (4) and, as seen with regard to the centre axis (M), opposite the closing weight (12) which is arranged outside the housing (2).
2. Drain fitting according to Claim 1, characterised in that the actuator (11) and the closing weight lie between two limiting planes (Z) which lie parallel to each other, which limiting planes (Z) extend parallel to the centre axis (M) and through the maximum extent of the surface which delimits the float chamber.
3. Drain fitting (1) according to Claim 1 or 2, characterised in that the actuator (11) is designed exclusively for the lifting of the valve body (5), but not for holding the valve body (5) in the flushing position, and in that the valve body (5) is held in the flushing position on account of the hydraulic equilibrium in the float chamber.
4. Drain fitting (1) according to one of the preceding claims, characterised in that for the first flushing quantity the actuator (11) acts directly upon the valve body (5) which can be lifted directly by means of the actuator (11); and in that for the second flushing quantity the actuator (11) acts indirectly via the control unit (10) upon the valve body (5) which can be lifted indirectly via the control unit (10) by means of the actuator (11).
5. Drain fitting (1) according to one of the preceding claims, characterised in that during operation the closing weight (12) can be moved along the surface (4) in the direction of the centre axis (M) from an inoperative positon to a flushing position over a movement range (B), wherein the movement range (B) of the closing weight (12) preferably extends to a height position in which the actuator (11) lies in such a way that the closing weight (12) can be moved to a height position in which the actuator (11) lies.
6. Drain fitting (1) according to Claim 5, characterised in that the closing weight (12) is designed adjustably in its height over an adjustment range (E), wherein the adjustment range (E) of the closing weight (12) preferably extends to a height position in which the actuator (11) lies in such a way that the closing weight (12) can be displaced to a height position in which the actuator (11) lies.
7. Drain fitting (1) according to one of the preceding claims, characterised in that the control unit (10) also comprises a bearing rod (13) which is arranged outside the housing (2), wherein the closing weight (12) is mounted on the bearing rod (13) in a fixed manner or in an adjustable manner relative to the bearing rod (13).
8. Drain fitting (1) according to one of the preceding claims, characterised in that the closing weight (12) can be switched via a switching element to the valve body (5), wherein during the lifting of the closing weight (12) the switching element (14) automatically creates a latching connection with the valve body (5).
9. Drain fitting (1) according to one of the preceding claims, characterised in that the actuator (11) has a first actuator lever (15) and a second actuator lever (16), wherein the first actuator lever (15) acts upon the valve body (5) and wherein the second actuator lever (16) acts upon the control unit (10).
10. Drain fitting (1) according to Claim 9, characterised in that the stroke of the first actuator lever (15) is different to the stroke of the second actuator lever (16).
11. Drain fitting (1) according to either of Claims 9 and 10, characterised in that the connection between the actuator lever (15) and the valve body (5) or the control unit (10) is such that the valve body (5) or the control unit (10) can be lifted even without operation of the actuator lever (15).
12. Drain fitting (1) according to one of the preceding claims, characterised in that the actuator (11) is a pneumatic actuator, especially with two pistons (17, 18) which are arranged one above the other.
13. Drain fitting (1) according to one of the preceding claims, characterised in that the surface (4) has at least one receiving element (19) and in that the actuator (11) has at least one latching element (20), wherein the latching element (20) engages in the receiving element (19) in such a way that the actuator (11) can be connected to the housing (2).