WO2005121462A1

WO2005121462A1 - Hydrant

Info

Publication number: WO2005121462A1
Application number: PCT/AT2005/000189
Authority: WO
Inventors: Rainer Geisendorfer; Markus Oberguggenberger
Original assignee: Krammer-Armaturen- Produktions- Und Handels- Gesellschaft M.B.H.
Priority date: 2004-06-09
Filing date: 2005-06-02
Publication date: 2005-12-22
Also published as: EP1759067A1; RU2361044C2; ATA9992004A; RU2006147228A; AT413834B

Abstract

The invention relates to a hydrant (1) comprising a valve housing (4) that is provided with a shut-off device (14), the latter comprising at least one shut-off element (17, 20), e.g. valve piston (19) or floating ball (16), which can be adjusted using at least one actuating unit (21) and comprising a flange sealing ring (35) that is situated in a valve housing (4) and delimits a flow cross-section (30) for a medium (3). A hydrant column (8) comprising a hydrant head (9) with at least one outlet fitting (10) for the medium (3), is positioned on the valve housing (4). The latter (4) is divided on a plane that runs perpendicular to a flow direction of the medium (3) and is configured by a base housing (6) with the shut-off device (14) and an attachment housing (7), which is maintained at a distance by a flange assembly (44) of the flange sealing ring (35) and which has a guide assembly (27) for the shut-off element (17, 20).

Description

hydrant

The invention relates to a hydrant as described in the preamble of claim 1.

From document DE 196 25 572 AI a hydrant is known which is formed from a one-piece jacket tube for receiving a main valve with a spindle-operated valve body and a floating ball. The valve body and the floating ball form a first and a second locking arrangement for a medium in the casing tube with sealing surfaces or with a sealing ring used in a shaping of the casing tube.

DE 100 28 655 AI also discloses a pipe connection for a height-adjustable hydrant which can be adapted to a trench depth by means of a multi-part telescopic pipe arrangement fastened to a valve body. A valve piston, which can be actuated via an adjusting spindle, is adjustably arranged in the valve body, which forms a locking arrangement for the medium with an annular seal arranged in the valve housing, and the adjusting spindle is constructed in several parts and a spindle part connected to the valve piston is secured against rotation in the tube arrangement.

The object of the invention is to provide a hydrant with a valve housing which is designed equally for a single as well as a multiple locking arrangement and the assembly, as well as the replacement of wearing parts, can be carried out in a simplified manner.

This object of the invention is achieved by the features reproduced in the characterizing part of claim 1. The surprising advantage of this is that the division of the valve housing into a basic housing and a top-mounted housing with a flange sealing ring arranged in between and the unmistakable position assignment of the components specified by the positioning means means that the initial assembly and subsequent manipulations when replacing wearing parts can be carried out error-free and simplified.

An embodiment according to claim 2 is possible because this ensures the shut-off security even in the event of faults in a locking arrangement. According to the advantageous development set out in claims 3 and 4, a compact structural unit of the valve housing is achieved.

However, an embodiment according to claim 5 is also advantageous, as a result of which a streamlined and positionally secure arrangement of a sealing element to be provided for a double lock is achieved, which can be replaced easily after wear and tear and a complex adhesive process, as is often used, is avoided.

According to the advantageous developments according to claims 6 to 10, the essential functions of the housing seal, as well as the locking arrangement, become one

Component achieved with the advantage of saving several different components for these functions.

However, it is also possible, for a different design, to adapt the outer diameter of the ring extension of the flange sealing ring to a housing diameter of the base housing and thus to center the flange sealing ring in the base housing and thereby avoid eccentricity between the sealing surface of the ring extension and the valve piston.

The advantageous training reproduced in claim 12 enables an automatic

Locking in a first locking arrangement, which prevents unwanted outflow of the medium, e.g. in the event of damage to the hydrant column, effectively prevented.

The advantageous embodiment reproduced in claim 13 ensures a reliable, further locking arrangement of the hydrant.

The advantageous developments described in claims 14 to 17 ensure an easy-to-manufacture guide arrangement and effective linear movement of the valve piston with simplified assembly of the hydrant.

According to the development described in claim 18, a particularly wear-resistant design of the valve piston is achieved with a high sealing effect. Due to the design described in claim 19, stable guidance of the valve piston is achieved and, at the same time, the function for emptying the hydrant is achieved without further measures after the locking arrangement or locking arrangements have been closed.

Another advantageous embodiment is described in claim 20, whereby an adaptation of the actuating device, in particular to the often required different lengths of the hydrant columns, is simplified.

The design described in claim 21 also reduces the assembly effort and combines the locking function with the emptying function in a simple manner, without additional components being required.

However, designs according to claims 22 and 23 are also advantageous, as a result of which the individual elements of the valve housing and the flange sealing ring are clearly assigned.

Finally, however, designs according to claims 24 and 25 are also advantageous, which simplifies the positional alignment of the hydrant head to be carried out according to local conditions.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings.

Show it:

Figure 1, the hydrant according to the invention with the two-part valve housing, partially cut.

Figure 2 is a detailed view of the valve housing, consisting of the base housing and the top housing with the two end positions of the locking elements, cut.

3 shows a view of the valve housing with a positioning device of the housing elements; FIG. 4 shows another design of the valve housing of the hydrant according to the invention, cut along lines IV-IV in FIG. 6;

5 shows the valve housing cut along the lines V-V in Fig. 6.

Fig. 6 shows the valve housing in plan view.

In the introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, and the disclosures contained in the entire description can be applied analogously to the same parts with the same reference numerals or the same component names. The location information selected in the description, e.g. above, below, laterally, etc. refer to the figure described and illustrated immediately and are to be transferred analogously to the new position in the event of a change in position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

1 to 3 a hydrant 1, e.g. with a double lock, placed in a vertical orientation, e.g. on a flange tube 2, for the supply of a medium 3, in particular

Water, shown from a supply line, not shown. The hydrant 1 comprises a valve housing 4 which is connected to the flange tube 2 and is divided in the direction of flow - according to arrow 5 - of the medium in a plane running perpendicular to the direction of flow and forms a base housing 6 and an add-on housing 7 with which a hydrant column 8 is connected to the flow on which a hydrant head 9 with at least one outlet fitting 10 is placed.

The hydrant column 8 is preferably provided with a threaded attachment 11 with an external thread 12 and screwed directly into an internal thread 13 of the attachment housing 7.

In the base housing 6 there is a shut-off device 14 with a first locking arrangement 15 with a shut-off element 17 designed as a floating ball 16 and a further locking arrangement 18 with a shut-off element 20 designed as a valve piston 19. The shut-off device 14 is adjusted via an actuating device 21. For this purpose, a rotatably mounted cap 22 is arranged on the hydrant head 9 and is connected to an adjusting spindle 23 which extends into the hydrant column 8 and which has an external thread 24.

The valve piston 19 is connected to a drill pipe 25 projecting in the direction of the adjusting spindle 23, which is provided with a spindle nut 26 with which the adjusting spindle 23 is in threaded grip.

By means of an axially acting guide arrangement 27 between the shut-off element 20, in particular the valve piston 19 and the attachment housing 7, or the drill pipe 25 and the attachment housing 7, an axial adjustment of the piston - according to double arrow 28 - in the direction of a longitudinal central axis 29 and thus a locking or releasing a flow cross-section 30 in the area of the shut-off device 14 during a turning operation of the adjusting spindle 23. This guide arrangement 27 comprises an approximately radially projecting guide arm 31 which is connected to the valve piston 19 or the drill pipe 25 and which projects into a linear guide track 32 which runs parallel to the longitudinal central axis 29 and which is formed by parallel ribs 33 on an inner surface 34 of the attachment housing 7 and thus the rotary movement on the cap 22 and the thread engagement between the adjusting spindle 23 and the spindle nut 26 is converted into a linear movement - according to double arrow 28 - of the shut-off element 20.

2 now shows in detail the valve housing 4, formed from the base housing 6 and the top housing 7 and with an annular flange sealing ring 35 stretched between them. 2 shows the two positions of the shut-off elements 17, 20 for a blocked and free passage for the medium.

Interacting with the shut-off elements 17, 20, the flow cross-section 30 comprising an annular shaped sealing element 36 with a sealing bead 37, which forms a sealing surface 39 with an inner surface 38 facing the floating ball 16, is arranged in the base housing 6. The form sealing element 36 is arranged on a sleeve-shaped ring extension 40 of the flange sealing ring 35, the ring extension 40 being encompassed by a jacket part 41 of the form sealing element 36 and being fixed between an outer surface 42 of the ring extension 40 and an inner surface 43 of the base housing 6 by a press fit. The flange sealing ring 35 is tensioned with a flange arrangement 44, consisting of parallel flange rings 45 between flanges 46 of the base housing 6 and the top housing 7 by means of connecting means 47, for example screws. The ring extension 40 integrally connected to the flange arrangement 44 of the flange sealing ring 35 with the form sealing element 36 surrounding it projects in the direction of the floating ball 16 into the base housing 6.

The floating ball 16 is mounted in the base housing 6 so as to be adjustable in the direction of flow of the medium 3. The floating ball is designed as a floating body with a lower density than a density of the medium 3 and thus through the medium 3 to seal the flow cross section 30 against the sealing surface 39 of the molded sealing element 36 or the sealing bead 37 is pressed.

The form of the form sealing element 36 provides the tubular jacket part 41, with which the ring extension 40 is encased and with which the sealing bead 37 is connected in one piece, which protrudes beyond the ring extension 40 against the flow direction of the medium 3, the sealing surface 39 being in the form of a spherical cap is. A diameter 48 of the floating ball 16 corresponds approximately to an inner diameter 49 of the base housing 6 in the connection area to the attachment housing 7.

Furthermore, on the jacket part 41 of the form-sealing element 36, the jacket part 41 is radial

In the direction of the projecting, annular sealing lip 50 is integrally formed, which serves as a seal between the flange 46 of the base housing 6 and the flange arrangement 44 of the flange sealing ring 29.

2 shows the blocking arrangement 18 with the valve piston 19, in addition to the blocking arrangement 15 with the floating ball 16, in the two positions, a cylindrical inner surface 51 of the flange sealing ring 35 having a sealing surface 52 for the valve piston 19 in the blocking position of the valve piston 19 forms. The valve piston 19 is located in an upper end position, limited by an adjustment path of the adjusting spindle, in which a valve plate 53 blocks the flow for the medium 3 from the base housing 6 into the top housing 7 and thus into the hydrant column 8. The valve disk 53 is provided on the circumference, facing the inner surface 51 of the ring extension 40, with a layer 54 of permanently elastic material, in particular an elastomer. Furthermore, at least two diametrically opposite guide and sealing vanes 55, which extend approximately parallel to the longitudinal central axis 29, are arranged on the valve plate 53, which are also provided with the layer 54, which provides a guide in an adjustment area of the valve piston 19 with the inner surface 51 of the ring extension 40 train for the valve piston 19.

At the same time, at least one of the guide and sealing vanes 55 forms with the layer 54 in the open position of the valve piston 19 a seal of an emptying bore 56 which crosses the flange sealing ring 35 in the region of the flange arrangement 44 in the radial direction with an adjoining emptying line. In the locked position of the valve piston 19, the drain hole 56 is flow-connected through a congruent connecting bore 57 crossing the guide and sealing wing 55 to the top housing 7 and thus the hydrant column 8, and this connection empties the hydrant 1 in its entirety, via the shut-off device 14 lying area to make this frost-proof.

The blocking arrangement 15 with the floating ball 16 is opened simultaneously with the opening of the blocking arrangement 18 with the valve piston 19. The floating ball 16 is moved in the open position against the flow direction of the medium 3 with an actuating surface 58 of the valve plate 53 facing it. When the locking arrangement 18 is closed, the buoyancy of the floating ball 16 or the flowing medium 3 results in an automatic closing.

To secure the coaxial position of the floating ball 26 in the region of a bulbous extension 59 of the base housing 6, which serves to form an annular flow channel 60 which surrounds the floating ball 16 in the open position, guide ribs 61 are provided in the basic housing 6, these having a diameter 48 of the floating ball 16 Limit the corresponding cross-section and thus effectively prevent sideways evasion.

Also shown in FIG. 2 is the guide arrangement 27 of the previously described

Valve piston 19, which consists of the radially projecting guide arm 31 arranged on one of the guide and sealing vanes 55 and the guide track 32 formed by the ribs 33 of the top housing 7. The ribs 33 have a different length 62, centering the valve piston during assembly.

Instead of the illustrated and described guide arrangement 27, it is of course also possible, according to another embodiment, to provide the drill pipe 25 with the guide arm 31, as shown in broken lines.

FIG. 3 shows a position assignment between the base housing 6, the add-on housing 7 and the flange sealing ring 35 arranged between them, which simplifies assembly and avoids assembly errors. Since to seal the drain hole 56 with one of the guide and sealing wings, its position must be exactly matched to the position of the drain hole 56 of the flange sealing ring 35, and on the other hand the position of the guide and sealing wing is predetermined by the position of the guide track for the guide arm in the top housing 7 is, for example on the flanges 46 of the base housing 6 and the top housing 7 positioning means 63 Positioning lugs are provided, which position them relative to one another and in relation to the flange sealing ring 35 in a predetermined position, e.g. in that a shoulder 64 traversed by the drain hole 56 is to be positioned on the flange arrangement 44 of the flange sealing ring 35 between the positioning means 63, thereby ensuring that the components are assembled in the correct position.

As can be seen in particular from Fig.l, the base housing 6 is provided for connection to the flange tube 2 according to a preferred embodiment with a loose flange 65, i.e. that it can be rotated relative to the base housing 6 and that the valve housing 4 with the hydrant column 8 and the hydrant head can be positioned in desired positions regardless of the position of a fixed flange 66 on the flange tube 2. For this purpose, the loose flange 65 is preferably formed from two half rings which are connected in a stepped overlap area by connecting means. For the axial holding of the loose flange 65 in a predetermined assembly position, the latter is arranged between a sealing flange 67 of the base housing 7 and a positioning flange 68, which is preferably formed by an extension projecting over the valve housing 4 at certain points or in a ring.

To explain preferred further technical measures, it should also be noted that an inner diameter 69 of the sealing bead 37 is slightly larger than an inner diameter 70 of the ring extension 40 and also larger than an outer diameter 71 of the valve piston 19, and this is slightly larger in the uncompressed layer 54 than the inner diameter 70 of the ring extension 40.

4 to 6 show another embodiment of the valve housing 4 with the shut-off device 14 of the hydrant 1 (not shown further) with a single lock, the same reference numerals being used for parts and components already described and described in the previous figures.

The valve housing 4 consists of the base housing 6 and the top housing 7, between which the flange sealing ring 35 is tensioned in the flange arrangement 44, between the flanges 46.

In this embodiment, the locking device 14 consists of the valve piston 19 with the two diametrically opposed guide and sealing vanes 55 and is preferably a cast metal body which is encased on all sides with an elastomer material and which is in an axial direction

Bore 72 is penetrated by an actuating rod 73 and is rotatably mounted thereon and immovably in the axial direction. Between the valve piston 19 and the actuating rod 73 a e.g. sealing arrangement 75 formed by O-rings 74 is provided.

The actuating rod 73 has an external thread 78 in an end region 76 projecting into the base housing 6 over a length 77 which determines an adjustment path for the valve piston 19 and which is in threaded engagement with a spindle nut 79 which is fixed in a support web 80 which is supported by a Housing wall 81 of the base housing 6 protrudes in the direction of the longitudinal central axis 29. The end region 76 provided with the external thread 78 thus forms the adjusting spindle 23 for adjusting the valve piston 19 and is coupled in a rotationally fixed manner to the drill pipe 25 of the actuating device 21.

Molded on the valve piston 19 and projecting in the radial direction, the guide arm 31 is provided, which secures the valve piston 19 against rotation in the guide track 32, which is formed by the ribs 33 projecting beyond the inner surface of the attachment housing 7.

A cylindrical sealing surface 82 is formed on the valve piston 19 and has a cylindrical - lo ¬

The inner surface 83 of the ring extension 28 of the flange sealing ring 35 causes the flow of the medium 3 to be blocked as soon as the valve piston 19 is adjusted into a blocking position in which the surfaces overlap. In the simple locking design of the hydrant 1, a sealing element is used instead of the form sealing element with the sealing lip, e.g. O-ring, flat sealing ring, coating etc. provided in the flange arrangement 44 for sealing.

In the exemplary embodiment shown, the valve piston 19 is in a position which enables the flow. The emptying bore 56, which crosses the flange sealing ring 35 in the radial direction, is covered by one of the guide and sealing vanes 55 and thus a

Escaping the medium 3 from the drain hole 56 prevented.

In the locked position of the valve piston 19, however, the sealing surface 82 of the valve piston 19 is arranged upstream of the drain hole 56 in the direction of flow of the medium 3 and in sealing contact with the inner surface 83 of the flange sealing ring 35. In this position of the valve piston 19, the drain hole 56 is in free flow connection with the no longer pressurized attachment housing 7 or the hydrant column 8 and the hydrant head, which means that these areas are emptied automatically.

It should also be mentioned that the flange arrangement 44 with the flanges 45, 46 and the

Flange sealing ring 35 is designed to be pressure-tight by various measures known from the prior art, e.g. with flat sealing rings, O-rings, coatings, etc.

The exemplary embodiments show possible design variants of the hydrant 1, it being noted at this point that the invention is not limited to the specially illustrated design variants of the hydrant 1, but rather also various combinations of the individual design variants with one another are possible and this variation possibility is based on the teaching of technical action The present invention lies in the ability of the person skilled in the art in this technical field. The scope of protection also includes all conceivable design variants which are possible by combining individual details of the design variant shown and described.

For the sake of order, it should finally be pointed out that for a better understanding of the Construction of the hydrant of these or its components were partially shown to scale and / or enlarged and / or reduced.

The task on which the independent inventive solutions are based can be found in the description.

Above all, the individual in FIGS. 1, 2, 3; 4, 5, 6 shown form the subject of independent, inventive solutions. The relevant tasks and solutions according to the invention can be found in the detailed descriptions of these figures.

B e z u g s z e i c h e n a u f s t e l l u n g

Hydrant 36 form sealing element

Flange tube 37 sealing bead

Medium 38 surface

Valve housing 39 sealing surface

Arrow 40 ring process

Basic housing 41 jacket part

Top housing 42 surface

Hydrant column 43 surface

Hydrant head 44 flange arrangement

Outlet fitting 45 flange ring

Threaded flange 46 flange

External thread 47 connecting means

Internal thread 48 diameters

Shut-off device 49 inside diameter

Locking arrangement 50 sealing lip

Floating ball 51 surface

Shut-off element 52 sealing surface

Locking arrangement 53 valve plate

Valve piston 54 layers

Shut-off element 55 guide and sealing wing

Actuator 56 drain hole

Cap 57 connecting hole

Adjustment spindle 58 actuating surface

Male thread 59 extension

Pipe tube 60 flow channel

Spindle nut 61 guide rib

Guide arrangement 62 length

Double arrow 63 positioning means

Longitudinal central axis 64 approach

Flow cross section 65 loose flange

Guide arm 66 fixed flange

Guideway 61 sealing flange

Rib 68 positioning flange

Surface 69 inside diameter

Flange sealing ring 70 inner diameter 71 outer diameter

72 hole

73 rod

74 O-ring

75 sealing arrangement

76 end region

77 length

78 external thread 79 spindle nut

80 support bridge

81 housing wall

82 sealing surface 83 inner surface

Claims

Patent claims

1. hydrant (1) with a valve housing (4) with a shut-off device (14) with at least one shut-off element (17, 20) adjustable with an actuating device (21), e.g. Valve piston (19), floating ball (16) and with a flange sealing ring (35) arranged in the valve housing (4) and defining a flow cross-section (30) for a medium (3) and with a hydrant column (8) connected to the valve housing (4) A hydrant head (9) with at least one outlet fitting (10) for the medium (3), characterized in that the valve housing (4) is divided in a plane running perpendicular to a direction of flow of the medium (3) and by a base housing (6) is formed with the shut-off device (14) and a by a flange arrangement (44) of the flange sealing ring (35) spaced top housing (7) with a guide arrangement (27) for the shut-off element (17, 20) and the flange sealing ring (35) with a Base housing (6) projecting ring extension (40) is centered and between the base housing (6) and the flange sealing ring (35) and the top housing (7) positioning means (63) are provided for the position positioning.

2. Hydrant according to claim 1, characterized in that two locking arrangements (15, 18) forming the shut-off device (14) are preferably provided in the base housing (6).

3. Hydrant according to claim 1 or 2, characterized in that the flange arrangement (44) of the flange sealing ring (35) by two the annular extension (40) and connected thereto in parallel planes, preferably connected to one another via webs, connects the annular extension ( 40) flange rings (45) projecting in the radial direction.

4.Hydrant according to one of the preceding claims, characterized in that between opposing sealing surfaces of the flange rings (45) and flanges (46) of the base housing (6) and the top housing (7) sealing elements e.g. Flat ring seals, O-rings etc., are arranged or the sealing surfaces with a coating of sealing

Material are provided.

5. Hydrant according to one of the preceding claims, characterized in that on the ring extension (40) of the flange sealing ring (35) and comprising a form sealing element (36) with an essentially cylindrical casing part (41) which is press-fitted between the ring extension (40) and an inner surface (43) of the base housing ( 6) is supported.

6. Hydrant according to one of the preceding claims, characterized in that at least one sealing element is formed by a flange-shaped sealing lip (50) of the molded sealing element (36).

7. Hydrant according to one of the preceding claims, characterized in that on the jacket part (41) a ring extension (40) of the flange sealing ring (35) in the direction of the base housing (6) projecting sealing bead (37) is arranged.

8. Hydrant according to one of the preceding claims, characterized in that an inner diameter (69) of the sealing bead (37) is slightly larger than an inner diameter (70) of the ring extension (40).

9. Hydrant according to one of the preceding claims, characterized in that an outer diameter of the annular extension (40) is slightly larger than an inner diameter (49) of the base housing (6) minus a double wall thickness of the casing part (41) of the form-sealing element (36).

10. Hydrant according to one of the preceding claims, characterized in that the molded sealing element (36) preferably consists of an elastomer material and in the sealing bead (37) at least one stiffening element is arranged.

11. Hydrant according to one of the preceding claims, characterized in that an outer diameter of the ring extension (40) is slightly smaller than an inner diameter (49) of the base housing (6).

12. Hydrant according to one of the preceding claims, characterized in that the shut-off element (17) is formed by a floating ball (16) which is adjustable in the base housing (6) and which has a first lock with the sealing bead (37) of the molded sealing element (36) - arrangement (15) in the flow channel (60).

13. Hydrant according to one of the preceding claims, characterized in that the shut-off element (20) is formed by a valve piston (19) which is arranged so as to be adjustable essentially in the attachment housing (7) and which has a peripheral surface and an inner surface of the ring extension (40 ) of the flange sealing ring (35) and / or the sealing bead (37) of the molded sealing element (36) forms a further locking arrangement (18).

14. Hydrant according to one of the preceding claims, characterized in that the valve piston (19) by means of the actuating device (21), in particular an adjusting spindle (23) and spindle nut (26) is adjustable in the axial direction.

15. Hydrant according to one of the preceding claims, characterized in that a guide arrangement for the valve piston (19) through, extending parallel to the longitudinal central axis (29) and at least over an adjustment path of the valve piston (19)

Guide path (32) and a guide arm (31) which is arranged on the valve piston (19) and protrudes approximately in the radial direction and projects into the guide path (32).

16. Hydrant according to one of the preceding claims, characterized in that for forming the guide ball n (32) in the top housing (7) two, an inner surface

(34) projecting, at a distance from each other and extending over an adjustment of the valve piston (19) guide ribs (61) are arranged.

17. Hydrant according to one of the preceding claims, characterized in that a length of the guide ribs (61) is different.

18. Hydrant according to one of the preceding claims, characterized in that the valve piston (19) is formed by a metallic molded part which is encased on all sides, in particular provided with a coating of elastomer material.

19. Hydrant according to one of the preceding claims, characterized in that at least two guide and sealing wings (55) projecting in the axial direction are arranged on the valve piston (19).

20. Hydrant according to one of the preceding claims, characterized in that the spindle nut (79) of an adjusting spindle (23) for the valve piston (19) is arranged in the base housing (7) concentrically to the longitudinal central axis (29) in a support web (80).

21. Hydrant according to one of the preceding claims, characterized in that the flange sealing ring (35) in the region of the flange arrangement (44) has a drain hole (56) running in the radial direction.

22. Hydrant according to one of the preceding claims, characterized in that the positioning means (63) for the flange sealing ring (35) are formed by nose-shaped projections on the flanges (45, 46) lying opposite one another of the base housing (6) and the top housing (7) are.

23. Hydrant according to one of the preceding claims, characterized in that on the flange sealing ring (35) a projection (64) which is penetrated by the emptying bore (56) is arranged and is positioned between the positioning means (63) of the flanges (45, 46).

24. Hydrant according to one of the preceding claims, characterized in that the attachment housing (7) in an end region facing away from the base housing (6) is provided with an internal thread (13) for connection to the hydrant column (8).

25. Hydrant according to one of the preceding claims, characterized in that end regions of the top housing (7) and / or of the base housing (6) are provided with loose flanges (65).