EP2363542B1 - Control assembly - Google Patents

Description

The invention relates to a control arrangement for a vacuum actuated suction, intended for a vacuum sewer system comprising a housing having an outer wall, arranged therein by a wastewater caused by accumulated back pressure from a first switchable to a second position first valve, a via the first valve pressure-adjustable limited by a first membrane first chamber, wherein the first membrane is operatively connected to a second valve, passes through the depending on its position negative pressure or atmospheric pressure to the suction valve, a first connection via which the first chamber a negative pressure source is connected, which is shut off in the absence of or too little dynamic pressure of the first in its first position befindendem first valve and is released at sufficient back pressure in its second position befindendem first valve, leading to the atmospheric pressure mi t connected to the first chamber, preferably second cross-section adjustable second connection, which is acted upon with sufficient negative pressure first chamber, the first diaphragm is switchable together with the second valve of a first suction valve connected to the atmospheric pressure position into a second suction valve connecting the vacuum position, wherein the first valve in its second the first connection between the vacuum source and the first chamber releasing position shuts off the leading to the first chamber and acted upon by atmospheric pressure second compound, and wherein the first valve is a triggering membrane, via which the first connection in the first position of the first Valve is shut off, and has a connected via a spacer with the release membrane second membrane.

In order to keep waters clean, it is necessary that sewage enters sewage treatment plants. Often, however, this is not possible due to disproportionately high costs for conventional sewer systems or because of difficult local conditions such as lack of natural gradient, low settlement density, unfavorable ground or the crossing of a water protection area. But even for such problem cases, it is possible to carry out a wastewater treatment plant when a vacuum drainage or "vacuum sewerage" is used.

A corresponding vacuum sewerage system comprises as essential components house connection shafts with a normally open control arrangement and shut-off or suction valves, a subsequent line system with systematically arranged high and low points and a vacuum station with sewage collection tanks, sewage pumps, vacuum pumps, measuring and control technology ,

In order to promote the wastewater, this first flows from buildings via conventional freefall house connection lines to a swamp of a z. B. located on a property boundary shaft, in which the exclusively pneumatically controlled shut-off valves and the associated control arrangement are housed. Connected to the sump is an air-enclosing pitot tube, wherein the trapped air is hydrostatically compressed by liquid accumulated in the sump, so that a back pressure is generated.

Due to the mechanism provided in the control arrangement, the shut-off valve is opened and the waste water is sucked into the vacuum line in the presence of a defined dynamic pressure. The valve closes depending on the time after a few seconds via spring force and vacuum.

The wastewater itself collects at the low points in the pipe system and is pushed by nachschießender air gradually over the following high points in the direction of the vacuum station. From the collecting tank of the vacuum station then the wastewater with conventional sewage pumps via a pressure and Freigefälleleitung to Wastewater treatment plant promoted. In the collecting tank and in the piping system, a vacuum generator such as a vacuum pump maintains a negative pressure.

The control arrangement associated with the shut-off valve should thereby enable automatic adaptation to the wastewater portions to be suctioned off and to the operating conditions (for example the strength of the existing negative pressure) in the discharge system.

A control arrangement according to the DE-C-43 36 020 is extremely compact and structurally simple and offers a high level of operational safety. In this case, there is an independent of the strength of the upcoming negative pressure timing, ie, after elimination of back pressure when the liquid is sucked, the control assembly closes the vacuum supply to the shut-off valve after a defined period of time and the shut-off valve vented with ambient air, so that the shut-off valve is closed. The time remaining after the suction before the closing of the suction valve is used for admitting transport air from the environment in the vacuum system. For the system function, it would be desirable if the volume ratio of the admitted air and the sucked liquid would be higher, the weaker the upcoming negative pressure is. The above-mentioned control device is also characterized in particular by the fact that it keeps the after-opening time for the air approximately constant and the volume of the extracted wastewater portion is smaller, the weaker the upcoming negative pressure is. Another advantage of this control device is to cause a sudden change in the state of the control in that the second valve controlling the connection to the shut-off valve is switched abruptly.

Furthermore, from the US-A-4,373,838 a known under the name "AIRVAC" control arrangement known. In order to allow this time control over a pressure adjustable chamber, small diameter tubes are required, which can easily clog, so that a functionality is not always guaranteed, especially not when the ambient air supplied is dirty or humid. Also, a clear open / closed position of the negative pressure to the shut-off valve passing through valve is not given. This means that it is at low vacuum can come to a fluttering of the shut-off valve. In addition, the amount of wastewater or wastewater-air mixture per opening stroke of the shut-off valve is not clearly defined. This can lead to malfunctions, especially in the case of large amounts of waste water. Furthermore, it is disadvantageous that the suction time is dependent on the existing vacuum in an unfavorable for the entire system way, since the opening times are in turn dependent on the prevailing negative pressure. Thus, the opening time is shorter at low negative pressure than at high negative pressure. As a result, there is a risk, especially in the case of weak underpressure and large amounts of water accumulated in the sumps, that the pipeline network will be flooded and thus proper functioning no longer exists; because in a flooded system, the negative pressure continues to decrease.

A further disadvantage is that opening of the negative pressure to the shut-off valve releasing second valve can be done even at low vacuum, but not always sufficient for rapid suction. As a result, the risk arises that wastewater is raised in the freezing area of the line and can freeze there.

From the DE-A-37 27 661 a pneumatic control device for a shut-off valve on a vacuum sewer line is known. In order to ensure an accurate adjustment and reliable operation of the control device, at least one control valve and a minimum vacuum valve are required in addition to a first valve actuated by a dynamic pressure and a constructively complex timing device.

A control arrangement of the type mentioned is the EP-A-1 091 053 which is simple in construction and ensures that liquid can not penetrate into the pressurizable by vacuum chamber.

Further control arrangements for an actuatable by negative suction valve are z. B. the EP-A-0 649 946 , of the DE-A-100 26 843 , of the DE-U-296 16 003 or the DE-B-10 2006 028 732 refer to.

The present invention is based on the object, a control arrangement of the type mentioned in such a way that when compared to the known control arrangements further simplified construction high reliability is given. At the same time it should be ensured that liquid can not penetrate or accumulate in the control arrangement, which impairs the functionality. According to another aspect, the possibility should be given to be able to change a switching of the control valve and thus the suction valve in a simple manner, so that switching can be done at desired dynamic pressures. Also, if necessary, a manual switching of the control arrangement for actuating the suction valve to be made possible.

To solve the problem is essentially provided that the second connection in the second position of the first valve can be shut off via the second membrane, wherein a gap between the trigger membrane and the second membrane with dynamic pressure can be acted upon.

The invention generally relates to a control arrangement for an actuatable by vacuum suction valve, intended for a vacuum sewer system, comprising a first valve and a second valve, depending on the position of the suction valve is actuated, can be sucked through the accumulated wastewater through the sewer system. For switching over the functionally connected to the second valve first valve acts on this built up by accumulated wastewater back pressure, which acts on a gap between a release membrane and a dynamic pressure diaphragm, which form a unit and the first valve.

Notwithstanding previously known constructions, two membranes forming one unit, namely the triggering membrane and the second membrane, which may also be referred to as a dynamic pressure membrane, exert the first valve, via which the first chamber is subjected to negative pressure or atmospheric pressure as a function of backpressure prevailing between the membranes will that second as a control valve too Significant valve allows or shuts off a connection between vacuum port and exhaust valve.

An inventive design feature provides that the trigger membrane, depending on its position, close or open a second chamber located in the flow path between the vacuum source and the first chamber in the first connection and which is connected to the vacuum source in the first position of the first valve is. It is inventively provided for adjusting the switching operation in dependence on the prevailing dynamic pressure that the second chamber is adjustable via an operable via the housing element from the outside in their effective in relation to the trigger membrane pressurizable surface.

In particular, it is provided that the second chamber release membrane side has a circular bottom surface which is circumferentially bounded by a sealing element such as O-ring, and that acts on the sealing element accessible from the outside of the housing adjusting element for adjusting the sealing element. If z. For example, if the area of the second chamber is reduced, it is possible to detach the release membrane from the seal and thus to adjust the first valve at a lower dynamic pressure than with a larger bottom area of the second chamber.

Preferably, the adjusting element is displaceably arranged in a channel-shaped opening such as bore, which is sealingly closable on the outside. In order to enable a defined adjustment, pin elements of defined length can be introduced into the bore. However, it is also possible to use an element which can be screwed into the bore in order to change, via a kind of spindle, the surface which is pressurized by negative pressure via the second chamber.

The release membrane has a geometry of a wave-like seal, which has a peripheral in section U-shaped peripheral, ie outer portion and a flat formed as a flat gasket inner portion which can be applied to the sealing the second chamber seal.

The release membrane can also be characterized in that it has in its second sealing chamber sealing position in section a U- or double-U-shaped geometry with preferably a circumferential L-shaped edge over which the trigger membrane in a first intermediate wall of the housing fixed is. It is given a quasi-cup-shaped geometry with outwardly curved peripheral wall.

From the designated as a flat gasket bottom wall of the trigger membrane is approximately centered connected to the second diaphragm spacer for common adjustment of these. For secure attachment is provided for this purpose that from the middle region of the inside of the bottom wall, a passage opening exhibiting inner projection emanates, which is sealingly penetrated by a preferably pin-shaped pin member and connected to a first holder, from which the second membrane starts.

In particular, it is provided that the second diaphragm emanates from a plate-shaped first holder, which is connected via the spacer or pin member with the triggering membrane.

Furthermore, the first diaphragm defining the first chamber should also emanate from a holder referred to as a second holder, which is acted upon via a spring element extending in the first chamber in the direction of a second intermediate wall extending away from the first valve and from the piston of the second valve is interspersed.

The first diaphragm and the second intermediate wall penetrated by the piston define a third chamber which is connected to a connection leading to the atmosphere. The piston extending from the second diaphragm receiving the first diaphragm then establishes, in dependence on the position of the second valve, a connection between the third chamber and a fourth chamber, which can be shut off or connected to a vacuum connection via the second valve. From the fourth chamber is also a connection for the suction valve.

When the second valve is closed, negative pressure enters the second chamber, which is closed by the triggering membrane in the first position of the first valve, via the vacuum connection. The first chamber and the third chamber are exposed to atmospheric pressure. The atmospheric pressure also prevails on the side of the second membrane facing away from the release membrane, which delimits a fifth chamber, which is closed on the outside by a housing wall. A connection between the atmosphere port and the fifth chamber via channels running in the housing, wherein the atmosphere passes through a filter connecting the fifth chamber with the channels.

The fifth chamber is connected via a likewise extending in the housing wall channel with the first chamber. This is further connected via a channel passing through the first intermediate wall with a space extending between the outside of the triggering membrane and the first intermediate wall.

If a sufficient dynamic pressure is present in the intermediate space between the trigger membrane and the second membrane, then the separation membrane-second membrane unit is adjusted to the seal defining the second chamber in such a way that the vacuum can continue into the first chamber. At the same time, the connecting channel between the fifth chamber and the first chamber is closed by the second membrane. Due to the pressure reduction in the first chamber with simultaneous further atmospheric pressure of the first diaphragm on the side facing away from the first chamber and a valve in the fourth chamber adjustable valve plate of the second valve, also acts on the atmospheric pressure, but a smaller area than the first membrane with the pressure-effective Having surface of the second holder, the spring force acting on the first membrane or its holder spring force can be overcome, so that the second valve adjusted, d. H . is opened. At the same time, the connection between the third and fourth chambers is shut off via the valve piston, so that negative pressure can now reach the suction valve via the opened second valve, thus switching it over; because the valve plate closes the pressurizable with the first connection between the first Vacuum source and the first chamber with simultaneous pressurization of the first chamber to atmospheric pressure.

After the desired reduction of the dynamic pressure, the unit release membrane - second membrane, which form the first valve, in its normal position, thus seals the second chamber from the first chamber, so that a further negative pressure this does not occur. The negative pressure itself is now reduced via the channel which is no longer closed by the second membrane and connects the fifth chamber, which is connected to the atmospheric pressure, with the first chamber. As a result, the force of the spring can act on the first membrane or its holder in such a way that the second valve is closed. At the same time, atmospheric pressure flows through a connection, which is no longer blocked off by the valve piston, in the second intermediate wall to the connection of the suction valve that originates from the fourth chamber, so that it switches and blocks.

In a further development of the invention, it is provided that the valve piston in the axial direction has a protrusion over its valve plate, by means of which a sealed housing opening an axial adjustment of the valve piston with a closed second valve is made possible with the result that a manual actuation of the control arrangement and thus Umschalts the suction valve is enabled.

Furthermore, the control arrangement according to the invention differs from previously known constructions in that the connections for the negative pressure, the suction valve and the atmosphere in the operating position of the control arrangement connected to the housing are vertically aligned and the chambers communicating with them are aligned with the connecting pieces in this way are that any accumulated liquid or condensate can drain due to gravity. This concerns at least the third and fourth chambers.

Further details, advantages and features of the invention not only result from the claims, the features to be taken from them - for themselves and / or in Combination, but also from the following description of the drawing to be taken preferred embodiments.

Fig. 1

eine erste Schnittdarstellung durch eine Steueranordnung bei fehlendem Staudruck,

Fig. 2

die Steueranordnung gemäß Fig. 1 in einer weiteren Schnittdarstellung,

Fig. 3

die Steueranordnung nach Fig. 1 und 2 bei Vorliegen eines Staudrucks vor Betätigen eines in der Steueranordnung integrierten Steuerventils,

Fig. 4

die Steueranordnung gemäß der Fig. 1 bis 3 bei geöffnetem Steuerventil,

Fig. 5

die Steueranordnung gemäß Fig. 4 bei geöffnetem Steuerventil, jedoch abgebautem Staudruck,

Fig. 6

die Steueranordnung gemäß Fig. 1, jedoch bei handbetätigtem geöffnetem Steuerventil, und

Fig. 7

eine vergrößerte Darstellung einer Einrichtung der Steueranordnung zum Einstellen der Höhe des Staudrucks, um die Steueranordnung zu betätigen.

Show it:

Fig. 1

a first sectional view through a control arrangement in the absence of back pressure,

Fig. 2

the control arrangement according to Fig. 1 in a further sectional view,

Fig. 3

the control arrangement after Fig. 1 and 2 in the presence of a back pressure before actuating a control valve integrated in the control arrangement,

Fig. 4

the control arrangement according to the Fig. 1 to 3 with open control valve,

Fig. 5

the control arrangement according to Fig. 4 with open control valve, but degraded back pressure,

Fig. 6

the control arrangement according to Fig. 1 but with manual control valve open, and

Fig. 7

an enlarged view of a device of the control arrangement for adjusting the height of the dynamic pressure to actuate the control arrangement.

The Fig. 1 to 6 are longitudinal sectional views of a control arrangement 10 according to the invention can be seen, via which a suction valve, intended for a vacuum sewer system, can be actuated.

The currentless, but pneumatically operating also to be designated as a universal control control arrangement 10 has a stepped cylindrical housing 12, with a peripheral wall 14 and end walls 16, 18. In Fig. 1 the control assembly 10 is shown in its installed position, so that pipe or connecting pieces 20, 22, 24 are aligned vertically downwards. The connecting piece 20, which runs in the region of the right-hand end wall 18 in the drawing, is connected to the vacuum source of the vacuum water system. Vacuum is also referred to below as vacuum.

The adjacent nozzle 22 leads to the suction valve, and running in the region of the left end wall 16 nozzle 24 connects to the atmospheric pressure. Further, there is a port 26 which is connected to a sump in which a back pressure is built up in response to the accumulated and sucked wastewater. The size of the dynamic pressure determines the switching of the suction valve in the manner described below.

The housing 12 has a first intermediate wall 28, which is close in the drawing of the left end wall 16, and a second intermediate wall 30 which extends between the first intermediate wall 28 and the right end wall 18.

Essential components of the control arrangement 10 are a trigger valve 32, referred to as a first valve, and a second valve 34, which is a control valve, via which a connection between the vacuum port 20 and the port 22 for the shut-off valve can be produced or shut off, depending on the back pressure.

The triggering valve 32 consists of a release membrane 36 and a second membrane 38, which are connected to achieve a same direction movement via a connecting or spacer 40 with each other.

When the tripping valve 32 is closed, a second chamber 44 is closed by way of a bottom section 42 of the triggering membrane 36, said second chamber 44 being closed by way of one in the first intermediate wall 28 of the peripheral wall 14 and the right end wall 18 extending channel 46 is connected to the vacuum connection piece 20. The channel 46, which is composed in the Fig. From the sections 45, 47, 49, is thereby closed with a closed control valve 34 via a voltage applied to a valve seat 48 valve plate 50 of the control valve 34 with respect to a designated chamber fourth chamber 64, of the the pipe socket 20, 22 go out for the vacuum or the suction valve. When the second chamber 44 is closed, the bottom portion 42 bears against a circumferential seal 86, such as an O-ring, peripherally defining the second chamber 44.

The intermediate space 52 between the triggering membrane 36 and the second diaphragm 38 communicates with the port 26, which is acted upon by the dynamic pressure.

The second diaphragm 38, which can also be referred to as dynamic pressure diaphragm, which starts from a plate-like first holder 54, is connected via a connecting element 56 to the triggering membrane 36, which thus forms or is part of the supporting element 40. For secure connection, the release membrane 36 has on the inside a cylindrical projection 58 with a passage opening, which is sealingly penetrated by the pin-shaped connecting element 56 and secured by an end-side truncated conical extension 60. The opposite end of the pin-shaped connecting element 56 abuts the outer side 62 of the plate-shaped first holder 54 of the second diaphragm 38 and is formed quasi helically.

The release membrane 36 has a shape of a kind of shaft seal, which has a peripheral, in section U-shaped peripheral portion which is fixed in the first intermediate wall 28. The sealing the second chamber 44 occlusive bottom portion 42 acts like a flat gasket.

On the opposite side of the first intermediate wall 28 with respect to the trigger valve 32 there is a chamber 72, referred to as the first chamber, which is closed on one side by the intermediate wall 28 and on the other side by a membrane 74 referred to as the first membrane from a second bracket 76 starts. On the second holder 76 acts on the first partition wall 28 or one of this outgoing section supporting spring element 75, so that the second support 76 is subjected to force in the direction of the second partition wall 30.

Furthermore, the piston 78 of the control valve 34, which passes through the second intermediate wall 30, starts from the second holder 76.

When the trigger valve 32 is closed ( Fig. 1 . 2 ) Atmospheric pressure passes through the port 24, a channel 66 in a designated fifth chamber chamber 90, which is bounded on the one hand by the outside of the second diaphragm 38 and the first holder 54 and the other by the end wall 16 or one of these adjacent wall , Between the channel 66 and the fifth chamber 90, a filter 92 is provided. Of the fifth chamber 90 is a preferably diametrically to the pipe socket 24 and parallel to the end wall 16 extending further channel 94 goes out with respect to the corrugated edge region of the second diaphragm 38 such that the channel 94 can be flowed through with closed trip valve 32 and at opened trip valve 32 is shut off. Via the housing wall 12 extending channel sections 96, 98 and a nozzle gap 100, which serves the timed switching of the control valve 34, the first chamber 72 is then acted upon with open channel 94 at atmospheric pressure when the trigger valve 32 is closed. The first chamber 72 is connected via a channel 102 to a space between the outside of the triggering membrane 36 and the first intermediate wall 28. This area, which forms an annular space when the trigger valve 32 is closed, is identified by the reference numeral 104.

Furthermore, the atmospheric pressure prevails via the connecting piece 24 in a third chamber 82 which extends between the second holder 76, on which the spring 75 is supported, and the second intermediate wall 30. By way of longitudinal slots 84 extending in the longitudinal direction of the piston 78, the atmospheric pressure can flow into the fourth chamber 64 when the control valve 34 is closed, from which the pipe socket 22 which is connected to the suction valve proceeds. Consequently, atmospheric pressure is applied to the exhaust valve with the result that it is closed.

Is built in the space 52 between the release membrane 36 and the second diaphragm 38, a back pressure to the extent that the pressure prevailing in the second chamber 44 negative pressure which attracts the release membrane 36 and thus abut the bottom portion 42 of the seal 86, and so that the holding force generated by the negative pressure is overcome, the unit second diaphragm or dynamic pressure diaphragm 38 / trigger membrane 36 moves in the drawing to the left (s. Fig. 3 ) with the result that on the one hand, the channel 94, which is also to be referred to as a ventilation channel, is closed by the second diaphragm 38, and that, secondly, the pending in the second chamber 44 vacuum over a in the first intermediate wall 28 on the diaphragm side Nut or a gap 120 continues via the channel 102 into the first chamber 72, so that the atmospheric pressure is sucked off. As a result, due to the pressure prevailing in the third chamber 82 atmospheric pressure, which is bounded by the first diaphragm 74 and the second holder 76 on the one hand and the second partition 30 on the other hand, the forces acting on the second holder 76 from the spring 75 to be overcome with the As a result, the control valve 34 opens because its piston 78 is connected to the second bracket 76. Thus, the valve disc 50 with its seal 124 can detach from the valve seat 48 so that the channel 46, which is acted upon by negative pressure, is no longer closed to the fourth chamber 64, so that negative pressure is applied to the suction valve via the connecting piece 22. By adjusting the piston 78, the longitudinal slots 84 present in the longitudinal direction in the longitudinal direction are simultaneously closed so that the fourth chamber 64 can no longer be exposed to atmospheric pressure.

The switching of the control valve 34 is carried out despite the fact that both the valve plate 50 and the first diaphragm 74 and its holder 76 (2nd bracket) are exposed to atmospheric pressure, since the surface of the control membrane 74 with effective area of the holder 76 is greater than that Surface of the valve disc 50 is.

The dimensioning of the surfaces and the spring forces is such that the negative pressure in the first chamber 72 should be approximately 0.21 to 0.24 bar absolute to allow switching of the control valve 34.

As soon as the dynamic pressure in the space 52 designated as dynamic pressure chamber is reduced after the exhaust valve has been opened, the triggering valve 34 moves to the right due to the prestressing of the release membrane 36, so that the second chamber 44 moves towards the bottom surface 42 of the release membrane 36 due to sealing engagement the second chamber peripherally surrounding seal 86 is completed, so that a connection to the atmosphere no longer exists; because the leading to the first chamber 72 gap 120 in the first intermediate wall 28 extends outside the second chamber 44. At the same time by adjusting the second diaphragm 38, d. H. the peripheral bead, the channel 94 is opened so that atmosphere via the channels 96, 98 and the nozzle gap 100 can flow into the first chamber 72.

It will be apparent from the foregoing process that the trigger membrane 36 and the second membrane 38 perform the function of a valve.

The cross-section of the nozzle gap 100 can be changed by turning a screw 142, whereby the period of time, with which the first chamber 72 is exposed to atmospheric pressure, can be adjusted. Since now equal pressure conditions prevail on both sides of the first diaphragm 74 and its holder 76, the spring 75 can adjust the second holder 76 in the direction of the second intermediate wall 30 and thus the piston 78 of the control valve 34 such that the control valve 34 is closed, So the seal 124 of the valve disc 50 abuts against the valve seat 48. At this moment, the connected to the negative pressure channel 46 is shut off from the fourth chamber 64. At the same time, atmospheric pressure can flow into the fourth chamber 64 via the longitudinal slots 84 present in the circumferential wall of the piston 78, with the result that the suction valve is acted upon correspondingly via the connecting piece 22 so that it closes.

As is clear from the Fig. 6 Furthermore, there is the possibility of opening the control valve 34, without the back pressure required for this purpose in the intermediate space 52 between the release membrane 36 and the second membrane 38 prevails. For this purpose, it is provided that from the piston 78, a projecting over the plane defined by the valve plate 50 level protruding projection 160, which is aligned with an opening 162 in the end wall 18, wherein the opening 162 is sealed by a flexible member such as rubber member 164. Via the element 164 can thus act on the extension (projection 160) on the valve piston 78, an axial force, with the result that the valve piston 78 is moved into the interior of the housing 12 to open the control valve 34. If the axial force acts on the piston 78, the force of the helical spring 75 is noticeable, with the result that the piston 78 is moved back into its basic position for closing the control valve 34 via the second holder 76.

A self-inventive feature of the control assembly 10 is the constructive ability to adjust the effective acting on the release membrane 36 surface of the second chamber 44, so that a triggering of the control assembly 10 takes place at desired back pressures. For this purpose, it is possible to move the second chamber 44 peripherally limiting seal 86 as O-ring. This can be done according to Fig. 7 via adjustment elements which can be inserted into the housing, such as pins 200, by means of which the seal 86 is pressed in regions more or less inwardly (area 87). The adjusting elements 200 may have a desired length and are inserted into a channel, not shown, of the housing 12, which is sealingly sealed from the outside.

Instead of using different pin lengths and a threaded having a pin can be screwed into the channel, so that an adjustment in the manner of a spindle is made possible.

From the graphic representation of Fig. 7 Furthermore, it can be seen that in the second chamber 44, the channel portion 49 opens through an opening 202, via which the chamber 44 can be acted upon by negative pressure.

Claims (13)

1. Control device (10) for a purge valve actuatable by vacuum, intended for a vacuum waste water system, comprising:

   a housing (12) with an external wall,

   a first valve (32) arranged in the housing and switchable from a first position to a second position by dynamic pressure caused by accumulated waste water,

   a first chamber (72) bordered by a first membrane (74) and pressure adjustable via the first valve and functionally connected with a second valve (34), via which, depending on its position, vacuum or atmospheric pressure reaches the purge valve,

   a first connection (46), via which the first chamber is connectable with a vacuum source, which, at missing or too low dynamic pressure, is cut off by the first valve in its first position, and which, at sufficient dynamic pressure, is released by the first valve in its second position,

   a second connection (90, 94, 96, 98) leading to atmospheric pressure and connected with the first chamber and preferably adjustable in cross-section,

   wherein the first chamber being subjected to sufficient vacuum, the first membrane together with the second valve is switchable from a first position connecting the purge valve to atmospheric pressure to a second position connecting the purge valve to a vacuum,

   wherein the first valve in its second position, that releases the first connection between the vacuum source and the first chamber, cutting off the second connection, that leads to the first chamber and is capable to be subjected to atmospheric pressure, and

   wherein the first valve (32) comprises a release membrane (36), via which the first connection (46) is cut off when the first valve is in its first position, and a second membrane (38) connected by a spacer element (40) with the release membrane,

   characterized in

   that, via the second membrane (38), the second connection (90, 94, 96, 98) is cut off when the first valve is in its second position, wherein an intermediate space (52) between the release membrane and the second membrane is capable of being subjected to dynamic pressure.
2. Control device according to claim 1,
   characterized in
   that the release membrane (36) closes or opens a second chamber (44) depending on the position of the first valve (32), which is located in the flow path between the vacuum source and the first chamber (72) in the first connection (46).
3. Control device according to claim 2,
   characterized in
   that, with respect to its surface being effectively subjected to pressure relative to the release membrane (36), the second chamber (44) is adjustable via an adjusting element (200) that is actuatable from the outside of the housing (12) of the control device (10).
4. Control device according to claim 2 or 3,
   characterized in
   that the second chamber (44), on the side of the release membrane, has a circular floor area which is bordered peripherally by a sealing element (86) like O-ring, and in that an adjusting element (200) accessible from the outside of the housing acts upon the sealing element for adjusting the sealing element.
5. Control device according to claim 4,
   characterized in
   that the adjusting element (200) is arranged so as to be adjustable in a channel-shaped opening such as bore of the housing (12), which is sealed tight from outside.
6. Control device according to claim 2,
   characterized in
   that the release membrane (36), in a position sealing the second chamber (44), has in section a U- or double-U-shaped geometry with a peripheral edge preferably L-shaped in section, via which the release membrane is fixed in a first intermediate wall (28) of the housing (12).
7. Control device according to at least one of the previous claims,
   characterized in
   that with an edge section the second membrane (38) is aligned to a channel-like section (94) of the second connection (90, 94, 96, 98) running in the housing wall (12) and closes said connection with the first valve being opened.
8. Control device according to at least one of the previous claims,
   characterized in
   that the second membrane (38) emanates from a disk-shaped first mounting (54), which is connected via the spacer element (40) with the release membrane (36).
9. Control device according to at least one of the previous claims,
   characterized in
   that the first membrane (74) emanates from a second mounting (76),
   that a side of the second mounting bordering the first chamber (72) is acted upon by force toward a second housing intermediate wall (30) by a spring element (75) running within the first chamber,
   that a valve piston (78) of the second valve (34) emanates from the second mounting and passes through the second housing intermediate wall, said valve piston is adjustable with its valve disk (50) in a fourth chamber and is connectable to an valve seat (48) in sealing manner,
   and in that into the fourth chamber runs a connection (20) of the vacuum source and a connection (22) for the purge valve,
   at which with the first chamber being acted upon by vacuum and adjustment of the second mounting contrary to the force of the spring element (75), the valve disk is spaced apart from the valve seat and a connection exists between the connections.
10. Control device according to claim 9,
    characterized in
    that the second mounting (76) with the first membrane (74) and the second intermediate wall (30) border a third chamber (82), which is capable of being subjected to atmospheric pressure via a connection (24), with the third chamber being connected with a fourth chamber (64) via the piston (78) of the second valve (34) when the second valve is closed, and with the third chamber being locked relative to the fourth chamber when the second valve is open.
11. Control device according to claim 9,
    characterized in
    that the second valve (34) has a valve piston (78), which with a section (160) passes through a plane defined by the valve disk (50) in such a manner that via the section from the exterior of the housing an axial force can be applied to open the second valve.
12. Control device according to at least one of the previous claims,
    characterized in
    that in functional position of the control device (10) the first connection leading to the vacuum source, the second connection leading to the purge valve as well as the third connection connected with the atmosphere each pass over to tubular connection ports (20, 22, 24), which run vertically or essentially vertically and are connected with the third and fourth chamber (82, 64) in such a manner that accumulated liquid flows off due to gravity.
13. Control device for a purge valve actuatable by vacuum, intended for a vacuum waste water system, comprising a first valve (32) as well as a second valve (34) functionally connected with the latter, with the purge valve, via which, depending on the position of the second valve, accumulated waste water is capable to be drawn off via the sewage system,
    characterized in
    that that upon the first valve (32) acts a dynamic pressure developed by accumulated waste water, which impinges on a gap (52) between a release membrane (36) and a dynamic pressure membrane (38), which form a unit and the first valve.

Images