CZ20032478A3 - Underground hydrant - Google Patents

Abstract

The invention relates to an underground hydrant (1). Said hydrant comprises an outer jacket (2) and a valve housing (3), which adjoins said jacket and extends down therefrom. The housing can be connected to a water conduit by a connection opening (5) by means of a lower connecting flange (4) with the interposition of an annular seal (25). The hydrant also comprises a main valve (7, 10, 11) mounted in the valve housing (3), whose valve body (7) can be actuated by means of a spindle (6) that is guided through the outer jacket (2), in addition to a return valve (8, 12) located below the main valve (7, 10, 11), the valve body (8) of which is guided through the valve housing (3) and is prevented from falling out by an annular retaining device (15), consisting of a bush (16) and a collar (18), that is inserted into the connection opening (5), fixed to the wall thereof (17) and reduces the free diameter (D5) of said opening. To produce the retaining device simply and cost-effectively and in such a way that it can co-operate with a standard annular seal, the collar (18) fixes a separate annular seal (25) to the connecting flange (4).

Description

(57)

The underground hydrant (1) comprises an upper casing pipe (2) with a valve housing (3) connecting downwardly thereto, which is connected to the water port by a connecting hole (5) by means of a lower connecting flange (4) when the sealing ring (25) is inserted. conduit. The main valve is housed in the valve housing (3), the valve body (7) being operable by means of a spindle (6) guided in the jacket tube (2). The check valve is arranged below the main valve, the check valve body (8) being guided in the valve housing (3) and prevented from falling out by an annular holding device (15) mounted on its wall and reducing its free diameter (D5). The retaining device (15) is formed from an insert (16) and a ring (18) and the insert (16) is fixed to the wall (17) of the connection opening (5). The ring (18) holds a separate sealing ring (25) on the connection flange (4).

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01-1614-03-Eng

Underground hydrant

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an underground hydrant having an upper casing pipe, with a valve housing connecting thereto downwardly, which is connectable to a water pipe via a lower connection flange when a sealing ring is inserted, with a main valve housed in a valve housing. by means of a spindle guided in the casing tube, and with a check valve arranged below the main valve, whose check valve body is guided in the valve housing and by means of an annular retaining device inserted into the connection opening (5) fixed to its wall and reducing its free diameter (D5) it is prevented from falling out, the retaining device being formed from the insert and the ring and the insert being fixed to the wall of the connection opening.

BACKGROUND OF THE INVENTION

One such underground hydrant is known from the prior art, for example from DE 41 19 105 C2.

There, the annular seal for sealing between the underground hydrant and the water pipe laid in the ground is constructed in such a way that it acts - despite its sealing function outwards - as a holding device for the non-return valve body. For this purpose, the inner diameter of the annular seal is made smaller than the largest diameter of the valve body, so that the valve body, which is formed, for example, as a ball and which is inserted into the valve housing through a connection hole. This eliminates the need to modify or install a special holding device.

It is further proposed in this publication to provide a combined liner-like sealing and retaining device in a recess on a connecting flange by means of a positive fit, a force fit or an adhesive. For this purpose, a special annular seal is also formed or formed in an unusual manner, which also serves as a holding device. In order for the proposed annular seal to meet various requirements, the annular seal is formed, for example, from a solid core and an elastic sheath. First, it is evident that such a complicated solution leads to increased manufacturing costs and thus substantially to an increase in the annular seal. Furthermore, this means that, in the event that a special annular seal is to be replaced, for example due to wear or damage, it must always be available, ie stored.

SUMMARY OF THE INVENTION The object of the invention is to provide a holding device for a non-return valve body which is simple and inexpensive to manufacture and which can act in conjunction with a standard annular seal in the above-described hydrant.

SUMMARY OF THE INVENTION

To accomplish this task, an underground hydrant with an upper casing pipe, with a valve housing connecting thereto downwardly, which is connectable to the water pipe via the lower connection flange when the sealing ring is inserted, is designed with a main valve housed in the valve housing, The valve is operable by means of a spindle guided in the casing tube, and with a non-return valve arranged below the main valve, whose non-return valve body is guided in the valve housing and by an annular retaining device inserted into a port opening mounted on its wall and reducing its free the diameter is prevented from falling out, the retaining device being formed from the insert and the ring and the insert being fixed to the wall of the connection opening, according to the invention, which is based on holding the ring separately ý sealing ring on connecting flange.

The invention avoids the complicated modification of the annular seal, on the other hand it uses a conventional, standardized annular seal and on the other hand adapts the holding device for the valve body of the annular seal. If the annular gasket is replaced, it can easily be replaced, as it is a standard gasket that is standardized to DIN and ISO and is used many times in different areas of piping technology: Costly stockpiling and stocking of spare parts is not necessary. The holding device, on the other hand, is not an elastomeric part as an annular seal, but can consist of a highly wear-resistant material and, as a rule, is used again when replacing the annular seal, so that storage as a spare part is practically unnecessary. In addition, the holding device is easy and inexpensive to manufacture as a bulk product.

In a first embodiment, where the retaining device is formed in an L-shaped longitudinal section, the ring forms a short flange and the insert a long L-shaped arm. In this shape, the retaining device, and in particular its ring, narrows the free diameter of the connection opening only a little. In order to further increase the safety on the wall, the insert is preferably at least twice as long as the ring.

The insert of the holding device can also be pressed, wedged or glued in the connection opening. For easier and safer mounting, the insert may be made elastic, and it may be sufficient to provide two or more, for example three or four, inches that extend axially and are radially elastically deformable. The fingers may project radially into the port hole to the extent that they prevent the valve body from falling out but ensure flow. The fingers may also have thumb tips that are radially curved to the wall, engage circumferential bevels or dedicated recesses in the wall, thereby fixing the holding device. The wall does not require any special treatment to attach the retaining device, the dimensional deviations in diameter are easily aligned with the radially flexible thumbs and possibly the point of the thumbs, so that the connection opening, at least in another inner wall section, does not have to be specially treated.

The insert may comprise an annular section which attaches to the ring and whose free diameter increases towards the attachment opening, for example, conically, by a funnel or convex shape. In this way, the bright inner space of the retaining device, likewise in the case of an L-shaped shape, is further adapted to the flow in terms of flow and an additional function is provided. This section may also, instead of or in addition to the aforementioned thumbs, hold or firmly grip the holding device on the wall.

The aforementioned thumbs may be slightly or also substantially longer than the annular section, for example twice as long as to increase their compliance. Furthermore, in order to further improve their holding function, they may be substantially thicker than the annular section, preferably two or three times as thick. To this end, the fingers project radially on at least one side of the annular section. In the cross section, the fingers can be formed rectangular or square and can weaken slightly in the cross section towards the ends or to the point of the fingers, which brings advantages in terms of both flexibility and the holding device made by injection molding.

The ring extends substantially rectangularly, as in the case of a straight "L" shape, with an angular adjustment of the annular portion of the insert also at an acute angle, to the annular portion. Preferably, a surface is provided on the insert that at least holds or even presses the annular seal against the connection flange. Any pressure-resistant annular seal may be used.

For at least partially receiving the annular seal, the connecting flange may have an annular recess around the connecting opening. The recess may be in the form of a step or groove, whereby the width and / or depth of the groove will optionally be defined by a connecting flange or insert. Particularly in the above case, the annular seal may consist of a sealing ring with a circular cross-section of the seal, a so-called sealing ring of circular cross-section whose thickness is slightly greater than the depth and / or width of the recesses. As a result, the annular seal is easily clamped and retained in the groove. Instead or in addition thereto, the insert may comprise an outer, preferably conical, i.e. oblique or curved, annular shell which forms at least partially a frontal, i.e. inwardly extending, side wall of the recess.

The retaining device may be formed of any rigid water-resistant material. Optimally in terms of production, function, durability and cost, the holding device is designed as a monolithic, homogeneous, injection molded plastic part, in particular of polyamide.

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BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the invention is illustrated and described in more detail in the drawing, in which:

FIG. 1 shows an underground hydrant in a central section; and FIG. 2 shows the flange region in FIG.

DETAILED DESCRIPTION OF THE INVENTION

The underground hydrant 1 is generally shown in FIG. 1. In its upper part it comprises a jacket tube 2 to which a valve housing 3 is attached downstream in this monolithic embodiment. Its lower end is shaped as a connection flange 4, which is arranged around the lower connection opening 5. In the casing tube 2, a rod-actuated spindle 6 is guided to move the main valve body 7. A non-return valve body 8, which is designed as a ball, is guided in the valve housing 3. The underground hydrant 1 is shown in the closed position of both its valves.

When the valve body 7 is moved downward by the spindle 6, the non-return valve body 8 pushes downward from its closed position and also reaches itself into a section of the valve housing 3 which is on average wider, so that water entering through the lower connection opening 5 which is pressurized, it can reach around the valve bodies 7 and 8 to the upper, aperture 9 shown on the left.

In Fig. 1 it is clear that both the main valve and the non-return valve are closed. The main valve body 7 is a piston with its lower cylindrical section 10 sealing and sealingly against the cylindrical inlet portion 11 in the valve housing 3. The non-return valve body 8 abuts the annular shape seal 12.

The check valve body 8 is secured against falling out through the connection opening 5 by a holding device 15, which is described in more detail in FIG. 2.

The retaining device 15 consists of a one-piece, injection-molded, homogeneous plastic part which is rigid and water-resistant, for example a polyamide such as PA 6. The retaining device 15 is essentially designed as a circular annular insert having an L-shaped cross-section. ". The longer, approximately 65 mm long L-shaped leg forms an insert 16 which is axially inserted into the connecting hole 5, the free diameter D5 of which decreases and closes radially on the wall 17. The shorter, approximately 14 mm long L-shaped leg forms an annular ring 18 connecting approximately at right angles to the insert 16, which here has a slightly larger outer diameter D18 than the connecting hole 5. The inner diameter is identical to the inner diameter D16 of the insert 16 and is smaller than the diameter D5 of the connection hole 5.

The insert 16 comprises an annular, approximately 36 mm long section 19, which in the inner diameter D19 extends funnelly over its axial length inwardly into the connection opening 5 until finally, at its end, its now enlarged outer side 20 abuts against the wall 17 of the connection hole 5 ..

The funnel bending of the inner side 21 of the liner section 19 continues somewhat in the wall 17; that is, the connection opening 5 also extends inwardly in diameter, here first approximately conically, then, further upwards, into a convex shape.

The insert 16 further comprises four circumferentially spaced, radially elastic fingers 22, two of which are shown. The fingers 22 extend axially from the ring 18 outwardly, passing through a section 19 which is approximately 30 mm long, and protruding about the same length above the section 19 outward axially inwards into the connecting hole 5. The thickness of the fingers 22 initially on the ring 18 is approximately 9 mm in square, then slightly decreases towards the end, so that the fingers 22, especially on the outside 20, then on the inside 21 of the section 19 which is only about 2 mm thick also project radially .

The fingers 22 terminate by crimped, radially lightly against the wall 17 with curved or cranked spikes of 23 inches. The spikes 23 inches are resiliently engaged radially in the depressions 24 of the wall 17: At least two of the four inches 22, and with them the retaining device 15, are clipped in the at least two depressions 24 and hence in the connection opening 5. The depressions 24 may be formed as cast recesses, so they do not need to be reworked.

The fingers 22 and the tip 23 of the fingers are designed and radially arranged to line the free diameter D5 of the port opening and prevent otherwise possible failure of the check valve body 8. At the same time, the fingers 22 hold the non-return valve body 8 in a position in which the normatively required water supply to the connected pipe is possible.

In its second function, the holding device 15 serves to hold a separate annular seal, here formed as a standardized sealing ring 25, namely a circular sealing ring with 110 x 8 mm rubber gauges, namely butadiene acrylonitrile with a Shore hardness of 80. For this purpose, an annular, stepped recess 26 is inserted into the connecting flange 4 frontally, concentrically and around the connecting opening 5, while the outer wall 27 and the bottom 28 of the groove recess 26 are formed by the connecting flange, an inner wall is formed. For this purpose, the ring 18 holds or pushes the ring 18 in an assembled position by an outer, low degree of inclination of the skirt 29 onto the sealing ring 25. The skirt 29 thus forms the rear section of the recess 26 and holds the sealing ring 25 securely stable. thus, the first component of the force on the outer wall 27 and the second component of the force on the bottom 28 are aligned due to their inclined course.

The radial width of the recess 26, which is different from the inclined skirt 29, is marked by the reference numeral B2, the depth of which is indicated by the reference numeral T26. These dimensions can be chosen somewhat less than the thickness of the sealing ring 25, which is 8 mm here, so that the sealing ring 25 is mounted in the recess 26 under a certain mounting tension. In this case, the sealing ring 25 protrudes somewhat not only above the face of the flange 4, but also above the ring 18 of the retaining device 15, so that it can be sufficiently deformed flexibly when flanged to a water-guiding pipe (not shown) and securely seal the flange connection. .

Claims (25)

PATENT CLAIMS 44 44 · « 4 4 4 4 444 An underground hydrant (1) with an upper casing pipe (2), with a valve housing (3) connecting thereto downwardly, which is connectable through an opening (5) by means of a lower connecting flange (4) when inserting a sealing ring (25) for the water pipe, with the main valve (7, 10, 11) housed in the valve housing (3), the valve body (7) of which is controllable by means of a spindle (6) guided in the jacket pipe (2) and with a check valve (8) 12) arranged below the main valve (7, 10, 11), whose non-return valve body (8) is guided in the valve housing (3) and by means of an annular retaining device (15) inserted into the connection opening (5) attached to its the retaining device (15) is formed from the insert (16) and from the ring (18) and the insert (16) is fixed to the wall (17) of the connection opening (5), characterized in that the ring (18) holds a separate sealing ring (25) on the connecting flange (4). An underground hydrant according to claim 1, characterized in that the holding device (15) is L-shaped in longitudinal section, the short L-shaped arm being formed by the ring (18) and the long L-shaped arm being formed by an insert (16). An underground hydrant according to claim 1 or 2, characterized in that the insert (16) is at least twice as long as the ring (18). Underground hydrant according to one of Claims 1 to 3, characterized in that the insert (16) holds the holding device (15) on the wall (17) by welding and / or force contact. 0 «···· 00 00 ·· · 00 ♦ ·· 0 0 00 · 0 0 0 0 0 0 0 000000 · 000 0 Underground hydrant according to one of Claims 1 to 4, characterized in that the insert (16) is at least partly bending-resilient in radial direction. An underground hydrant according to claim 5, characterized in that the insert (16) has at least two radially elastic deformable fingers (22) which extend in the axial direction and which hold the insert (16) on the wall (17). Underground hydrant according to claim 6, characterized in that the fingers (22) reduce the free diameter (D5) of the port (5) to the extent that they prevent the valve body (8) from falling out. An underground hydrant according to claim 6 or 7, characterized in that the fingers (22) comprise a point tip (23) curved radially to the wall (17). Underground hydrant according to one of Claims 1 to 8, characterized in that the connection opening (5) widens in the diameter of the liner (16) inwards. Underground hydrant according to one of Claims 1 to 9, characterized in that the insert (16) comprises one ring-shaped section (19) connecting to the ring (18) whose free inner diameter (D19) widens conically or funnelly. into connection hole (5) · An underground hydrant according to claim 10 in association with one of claims 6 to 9, characterized in that the fingers (22) are longer than the ring-shaped section (19). · «···· 0 0 0 000 00 0000 Underground hydrant according to claim 11, characterized in that the fingers (22) extend axially at least half the length of the annular section (19) through this outward and inwardly into the connection opening (5). An underground hydrant according to claim 10 in association with one of claims 6 to 9 or according to claim 11 or claim 12, characterized in that the fingers (22) are thicker than the annular section (19). Underground hydrant according to claim 13, characterized in that the fingers (22) have at least twice the thickness of the annular section (19). Underground hydrant according to claim 13 or 14, characterized in that the fingers (22) project radially on the inner side (21) and / or the outer side (20) of the annular section (19). Underground hydrant according to one of Claims 6 to 15, characterized in that the fingers (22) are rectangular in cross-section. Underground hydrant according to one of Claims 6 to 16, characterized in that the fingers (22) slim down in cross-section to terminate (point (23) of the finger). Underground hydrant according to one of Claims 1 to 17, characterized in that the ring (18) extends substantially at right angles to the insert (16). Underground hydrant according to one of Claims 1 to 18, characterized in that the ring (18) is held or pressed by the jacket (29). 44 ···· 4 4 5 · »· 4 · 44 4444 sealing ring (25) radially and / or axially against the connecting flange (4). Underground hydrant according to one of Claims 1 to 19, characterized in that the connecting flanges (4) have an annular recess (26) in which a separate sealing ring (25) is received. An underground hydrant according to claim 20, characterized in that the width (B26) and / or depth (T26) of the annular recess (26) is formed or formed by a connecting flange (4) and an annular (18). Underground hydrant according to claim 20 or 21, characterized in that the annular seal consists of a sealing ring (25) whose thickness is slightly greater than the depth (T26) and / or width (B26) of the recess (26). Underground hydrant according to one of Claims 20 to 22, characterized in that the ring (18) forms an outer, oblique or rounded annular skirt (29) at least partially the front side wall of the recess (26). Underground hydrant according to one of Claims 1 to 23, characterized in that the holding device (15) consists of a one-piece, homogeneous, injected, hardened and waterproof plastic part. Underground hydrant according to claim 24, characterized in that the holding device (15) consists of polyamide.