CH699704B1 - Hydrant main valve. - Google Patents

Abstract

The invention relates to a hydrant main valve (1) of a hydrant (3), which comprises a valve seat (5) rotationally symmetrical with respect to a valve axis (4), which is designed as an inner surface (6) of the main valve housing (2). This hydrant main valve (1) also comprises a substantially rotationally symmetrical with respect to the valve axis (4) valve body (7), which is arranged movable by means of a valve rod (8) relative to the valve seat (5) and a support member (9), a holding part (10 ) and a seal (11), wherein the support part (9) comprises a connection piece (12) for fastening this valve rod (8) and a stop surface (13) deviating from the direction of the valve axis (4), the stop surface (13 ) in the closed state of the hydrant main valve (1) a substantially parallel to the stop surface (13) extending counter surface (14) acts on the main valve housing (2), and wherein the seal (11) at least partially between the support member (9) and the holding part ( 10) is held clamped. The hydrant main valve (1) according to the invention is characterized in that the abutment surface (13) of the support part (9) and the counter surface (14) of the hydrant main valve are conical; that in a closing direction of the hydrant main valve (1), the holding part (10) in the valve body (7) of the seal (11) and the support member (9) with the stop surface (13) of the seal (11) is arranged trailing; and that the seal (11) is held and formed such that it deformed in the closed state of the hydrant main valve (1) and compressed the valve seat (5) sealingly.

Description

description

The present invention relates according to the preamble of independent claim 1, a main hydrant valve of a hydrant. This hydrant main valve comprises a substantially symmetrical with respect to a valve axis valve seat, which is formed as an inner surface of a main valve housing. In addition, this hydrant main valve comprises a valve body substantially rotationally symmetrical with respect to the valve body, which is arranged by means of a valve rod against the valve seat movable and which comprises a support member, a holding part and a seal. The support member includes a connecting piece for securing this valve rod and a deviating from the direction of the valve axis stop surface. The stop surface is acted upon in the closed state of the hydrant main valve a substantially parallel to the stop surface extending counter surface on the main valve housing and the seal is at least partially clamped between the support member and the holding part.

Hydrants with such a hydrant main valve have been installed in or on Swiss water distribution networks for many years and have proven themselves. In the known hydrants, be it now above ground or underground hydrants, it was sometimes observed that - to safely shut off the supply line to the hydrant - the hydrant main valve was closed with increasing closing time with increasing operating time. The seal of the hydrant main valve held on the supporting part of the valve body was pressed against the valve seat on the main valve housing with increasing force. As a result, it was found that some of the plastic materials used to make this seal began to flow with increasing closure pressure. This often meant that an even greater force was applied at the next closure, which in the repeated case caused a substantial portion of the sealing material to be forced away. In the worst case, a sufficient seal could no longer be achieved and the seal of the hydrant main valve had to be replaced. However, in particularly severe cases, the crowded sealing material prevented regular opening of the hydrant and routine replacement of the hydrant main valve under normal water pressure (about 5 to 16 bar). As a rule, this meant that the network section in question had to be disconnected from the rest of the water supply (by means of gate valves) and the hydrant had to be dismantled so that the blocked hydrant main valve could be dismantled and replaced.

The present invention has for its object to prevent blocking of the main hydrant valve, as has been known from the prior art.

This object is achieved with a hydrant main valve, as defined in the characterizing part of the independent claim 1. The hydrant main valve according to the invention is characterized in that the abutment surface of the support member and the counter surface of the hydrant main valve are conical, that in a closing direction of the hydrant main valve, the holding part in the valve body of the seal preceding and the support member is arranged trailing the stop surface of the seal, and that the seal is held and designed such that it deformed defined in the closed state of the hydrant main valve and pressed the valve seat sealingly. Further inventive features and embodiments will be apparent from the dependent claims.

The hydrant main valve according to the invention comprises the following advantages:

- The hydrant main valve can only be closed to a fixed end stop, which is permanently defined by the impact of the counter surface on the main valve housing by the abutment surface of the support member of the valve body.

- The defined end stop limits the contact pressure for the seal, which is thus deformed in a predetermined mass and pressed so that it rests sealingly against the valve seat.

- Many already put into operation hydrants already have a suitable mating surface, so that such hydrants, whether overground or underground hydrants, can be fitted in a routine maintenance and without modification with a hydrant main valve according to the invention.

- New hydrants can already be equipped as standard with a hydrant main valve according to the invention.

- The valve body of the hydrant main valve according to the invention is lighter and can be produced more cheaply than the already known valve body.

The hydrant main valve according to the invention will now be explained in more detail with reference to schematic, only a few selected, exemplary embodiments representing and not limiting the scope of the present invention drawings. Showing:

1 shows a detailed vertical section through a valve body according to the invention;

2 simplified, half vertical sections through different embodiments of the hydrant main valve according to the invention, in which:

Figure 2A is the valve body installed in a standard hydrant with a single conical inner surface;

2, FIG. 2B, the valve body is incorporated in a new hydrant or standard hydrant having two conical inner surfaces separated by a shoulder; FIG.

Fig. 2C, the valve body is installed in a new hydrant or standard hydrant processed, in which the counter surface deviates in its direction from a first conical inner surface.

1 shows a detailed vertical section through a valve body according to the invention, which is a component of a hydrant main valve 1 according to the invention (cf., FIG. 2A), which is arranged in a main valve housing 2 of a hydrant 3. This hydrant main valve 1 comprises a valve seat 5 which is essentially rotationally symmetrical with respect to a valve axis 4 and which is designed as an inner surface 6 of the main valve housing 2 (see FIG. 2A) and a valve body 7 which is essentially rotationally symmetrical with respect to the valve axis 4 and which by means of a valve rod 8 (FIG. see Fig. 2A) with respect to the valve seat 5 movable (see double arrow) is arranged and which comprises a support member 9, a holding part 10 and a seal 1 1. In this case, the support member 9 comprises a connecting piece 12 for securing this valve rod 8 and the seal 1 1 is at least partially clamped between the support member 9 and the holding part 10.

The support member 9 of the valve body 7 comprises a deviating from the direction of the valve axis 4 abutment surface 13 which acts in the closed state of the main hydrant main valve 1 a substantially parallel to the abutment surface 13 extending counter surface 14 on the main valve housing 2 (see FIG. , The seal 11 is also held and formed in such a way that it deforms in the closed state of the hydrant main valve 1 and compresses the valve seat 5 in a sealing manner.

The support member 9 of the valve body 7 is preferably made of a non-corrosive material, with a cast from a brass alloy support member is preferred. Optionally, it can be provided, for example, to rework the stop surface 13 and / or the connecting piece 12 by machining. For the production of the prototype a brass alloy (CuZn4oPb2) and a machining was used. Alternative materials for a support member 9 include in addition to other metal alloys and high strength or high-strength with filling materials made plastics or composites that can be produced by injection molding and / or machining.

The seal 1 1 is preferably made of a thermoset material, in particular polyurethane (PUR). Polyurethane with a hardness of 50 to 100 Shore is particularly preferred, with a hardness of 60 to 90 Shore being particularly preferred. Particularly preferred is a thermoset material, the guidelines of the German Federal Environmental Agency (UBA) for the hygienic assessment of organic materials in contact with drinking water [KTW = plastics and drinking water; Recommendations according to the former German Federal Health Office (BGA), which were taken over by the Federal Environmental Agency (UBA) and the Federal Institute for Health Protection and Veterinary Medicine (BgVV)] and that meets the requirements of the German Association for Water and Gas (DVGW) according to Worksheet W 270 Fulfills. For the production of a prototype for the seal 11, PUR with the designation 85 AU 20929 (blue) from Freudenberg Simrit AG (8050 Zurich, Switzerland) was used. The number 85 corresponds to the current Shore hardness, AU indicates the PUR used and the number 20939 indicates the mixture used. This prototype fulfills the above requirements according to KTW and DVGW and is therefore approved for use in drinking water pipes.

The holding part 10 is preferably made of a thermoplastic material (with or without Füllverstärkung), more preferably formed from polyoxymethylene or polyacetal (POM). The prototype of the holding part was made of POM semi-finished products (POM-C). The shape of the holding part 10 can be done depending on the composition by injection molding and / or by means of machining.

The inventive hydrant main valve 1 can be used in a wide range and is tight for a tested nominal diameter of 100 mm for a water pressure of over 30 bar. With the appropriate structural adjustments, in particular with respect to the support member 9, the holding member 10 and the seal 1 1, the inventive main hydrant valve 1 for a nominal width 28 of 50 to 200 mm can be used.

Preferably, the hydrant main valve 1 according to the invention for guiding the support member 9 in the direction of the valve axis 4 comprises a valve guide 25 with guide ribs 26 (see also Fig. 2A). It is also preferred that the support member 9 comprises a per se known drainage seal 27; Depending on the design requirements reinforcing ribs 32 may be provided.

Attaching or integrating a sensor for (permanent or sporadic) leak monitoring, such as this e.g. is known from the patent CH 691 932 A5, in or on the support member 9 is also preferred (not shown). In this case, the sensor may be attached to the support member surface or partially incorporated in the support member 9. Also, such a vibration sensor for detecting and measuring sound waves generated by leakage in the water of the piping network can be arranged in the actuator, particularly in the actuator spindle, as disclosed in CH 691932 A5. By means of known correlation techniques, the results of the sound measurements at two or more hydrants spaced apart by several hundred meters can be compared with one another, whereupon the location of the leaks producing the measured sound waves can be determined accurately to a few centimeters.

3 shows simplified, half vertical sections through different embodiments of the invention hydrant main valve 1. Good to see in Fig. 2 is also the valve rod 8, as this is secured by a locking screw 31 on the connecting piece 12. The valve rod 8 is preferably attached to the support member 9 so that it occupies a defined end position on the connecting piece 12 (see Fig. 2A to 2C).

In Fig. 2A, the valve body 7 is installed in a standard hydrant with a single conical inner surface 15. This first, particularly preferred embodiment of the hydrant main valve 1 according to the invention is characterized in that the valve seat 5 and the mating surface 14 are formed as a single conical inner surface 15 of the main valve housing 2. In such used for some years hydrant 3, the main hydrant valve 1 can be easily replaced during service. If the valve seat 5 of the used hydrant is still clean (with little or no signs of corrosion) and unhurt (without dents or deep scratches), a new hydrant main valve 1 according to the invention can be used immediately after removal of the old main valve.

If the valve seat 5 is heavily soiled or even damaged, then this can be either revised on site (for example, ground) or it can be the main valve body 2 of the damaged hydrant replaced.

The only conical inner surface 15 of the main valve housing 2 shown here is formed at an angle of 45 ° to the valve axis 4. Notwithstanding this illustration, the cone may also form any other angle between 10 ° and 80 ° (e.g., 30 °, 40 °, 50 °, or 60 °) to the valve axis 4.

The seal 1 1 is preferably annular, wherein it is also preferred that the holding part 10 comprises a substantially parallel to the valve axis 4 extending paragraph 19 which defines an inner radius of the annular seal 1 1 constant. Particularly preferably, the seal is rounded in its cross section on its sealing side 20 and straight on its side 19 substantially adjacent to the inside 21 formed (see also Fig. 1). The seal 1 1 may be formed as an open ring. When closing the hydrant main valve 1 while the sealing material is advantageously so pressed and deformed that the remaining, the ring interrupting column (not shown) sealingly closes. However, it is preferred to form the seal as a closed ring in which no gap must be closed. Optionally, a glued or welded or injection molded or stamped ring may be used. The seal 11 is preferably made of a thermoset material, in particular polyurethane (PUR).

The holding part 10 is reversibly connected by means of fastening elements 22 to the support member 9 here. The removal of the holding part is when inserting or replacing the seal 1 1 of great advantage. Such fasteners 22 are, within the knowledge and experience of those skilled in the art of engineering valve construction, selected from a group including screws, pins, and like fasteners. As an alternative attachment means and a bayonet closure could be provided. Particularly preferred is the use of screws 29, whose head is sunk into the holding part 10 (see Fig. 1). Particularly preferred is the use of three such, parallel to the valve axis 4 aligned screws 29, which are advantageously distributed quite close to the shoulder 19 and uniformly on a concentric with the valve axis ring line on the holding part 10.

The holding part is preferably made of a thermoplastic material (with or without Füllverstärkung), more preferably formed from polyoxymethylene or polyacetal (POM). The shape of the holding part 10 can be accomplished depending on the composition by injection molding or by means of machining.

Preferably, the support member 9 and / or the holding part 10 relief structures 18 for better holding the seal 1 1. Such relief structures are suitable to increase the contact pressure on the sealing surface locally; preferred relief structures are therefore a ridge 30 or a plurality of ridges 30 (preferably running around the support member 9 and / or the support member 10), which may be continuous or interrupted. Two parallel ridges 30 in the holding part 10 and three parallel ridges in the carrying part 9 are preferred (see FIG. The support member 9 of the valve body 7 is preferably made of a non-corrosive material, with a brass alloy being particularly preferred. An exemplary reinforcing rib 32 is shown here.

In Fig. 2B, the valve body 7 is installed in a new hydrant or standard hydrant processed, the two separated by a step 17 conical inner surfaces 16,16 <'>. In this second embodiment of the inventive hydrant main valve 1, the valve seat 5 and the mating surface 14 are formed as a first and second conical inner surface 16,16 <'> of the main valve housing 2 and offset from each other by a step 17. This stage 17 and thus also the first conical inner surface 16 are preferably by turning the main valve housing 2 of a used hydrant 3 or by a corresponding manufacture (casting of the main valve body, for example, in gray cast iron and over turning at least the valve seat 5, optionally also the counter surface 14) of a new Main valve body 2 generates.

Particularly preferred is a step 17, which is designed to extend substantially parallel to the valve axis 4, but it can also form an angle of about 1 ° to 80 ° to the valve axis 4 (not shown). Such a step 17 causes an additional space that can be used when closing the hydrant main valve 1 according to the invention for receiving the deformed sealing material. This additional space results in a larger

4 Selection range for the Shore hardness to be selected and for the dimensions of the plastic seal 1 1, which a specialist will select depending on the nominal diameter and the expected internal pressure of the water pipe. There is also the freedom of choice of those skilled in the art to use alternative gaskets, such as two superimposed disc gaskets with stamped center section (as shown in Figure 2B). The screws 29 for securing the holding part 10 can thereby penetrate these alternative seals (not shown).

In Fig. 2C, the valve body 7 is installed in a new hydrant or standard hydrant treated, in which the counter surface 14 deviates in their direction from a first conical inner surface 16. In this third embodiment of the hydrant main valve 1 according to the invention, the valve seat 5 is thus designed as a first conical inner surface 16 of the main valve housing 2, wherein the counter surface 14 is designed to extend in a direction deviating from the first conical inner surface 16. In this case, the angles which occupy the first conical inner surface 16 and the counter surface 14 to the valve axis 4 can be chosen virtually arbitrarily in a wide range, which in each case preferably angle between 10 ° and 80 °, more preferably angle between 30 ° and 60 ° , It is particularly preferred that the angle between the mating surface 14 and the valve axis 4 is greater than the angle between the valve seat 5 and the valve axis 4 (as shown in Fig. 2C).

As in FIG. 2B, a more accurate mapping of the inner surface of the main valve housing 2 has also been omitted here in FIG. 2C; likewise, for the sake of simplicity, no preferred valve guide 25 is shown here. Clearly, however, is an alternative fastening of the holding part 10 on the support member 9. The holding member 10 here includes a screw 23, which is reversible in a nut device 24 in the support member 9 can be screwed. This alternative, reversible attachment is suitable for a simple ring seal, as shown in FIG. 2A, it is particularly suitable for an alternative seal of two superimposed disc seals with punched middle part, as shown in FIG. 2B. Alternatively, more than two superimposed disc seals can be used (not shown).

The ring seal 1 1 in Fig. 2B is shown in an alternative, two-lipped form. However, three or more lips may be provided (not shown). The sealing lips either have a different length or they are the same length. However, if a simple ring seal is used, then this is preferably rounded off in cross-section on its sealing side 20 and formed straight on its inner side 21 substantially adjacent to the shoulder 19.

Although in Fig. 2C, no fasteners 22 are shown for fixing the holding part 10 on the support member 9, come in this case, all previously shown and described alternatives in question. In any case, it is preferred that the support part 9 and the holding part 10 comprise relief structures 18 for better holding the seal 11. Such relief structures may be formed as ridges 30 (see Fig. 1) or as pins or nubs. An exemplary reinforcing rib 32 is also shown here.

In all figures, the same reference numerals refer to the same elements, even if they are not described in detail in each case. Any combination of the elements shown or described for the different embodiments are within the scope of independent claim 1 within the scope of the present invention.

LIST OF REFERENCE NUMBERS

[0030]

1 hydrant main valve

2 main valve body

3 hydrant

4 valve axis

5 valve seat

6 inner surface

7 valve body

8 valve stem

9 supporting part

10 holding part

1 1 seal

12 connecting pieces

13 stop surface

5

Claims (1)

14 mating surface 15 only conical inner surface 16, 16 <'> first and second conical inner surfaces 17 level 18 relief structures 19 paragraph 20 sealing side 21 inside 22 fastener 23 screwing device 24 parent device 25 valve guide 26 leadership rib 27 Drainage seal 28 nominal diameter 29 screw 30 burrs 31 locking screw 32 reinforcement rib claims A main hydrant valve (1) of a hydrant (3) comprising: (A) a valve seat (5) which is substantially rotationally symmetrical with respect to a valve axis (4) and which is designed as an inner surface (6) of a main valve housing (2); and (B) a substantially with respect to the valve axis (4) rotationally symmetrical valve body (7) by means of a valve rod (8) relative to the valve seat (5) is arranged movable and a support member (9), a holding part (10) and a seal (11), wherein the support part (9) comprises a connecting piece (12) for fastening this valve rod (8) and a deviating from the direction of the valve axis (4) stop surface (13), wherein the stop surface (13) in the closed state the hydrant main valve (1) a substantially parallel to the stop surface (13) extending counter surface (14) on the main valve housing (2) acted upon, and wherein the seal (11) at least partially clamped between the support member (9) and the holding part (10) is, characterized in that the stop surface (13) of the support member (9) and the counter surface (14) of the hydrant main valve are conical; that in a closing direction of the hydrant main valve (1), the holding part (10) in the valve body (7) of the seal (11) and the support member (9) with the stop surface (13) of the seal (11) is arranged trailing; and that the seal (11) is held and formed such that it deformed in the closed state of the hydrant main valve (1) and compressed the valve seat (5) sealingly. Second hydrant main valve (1) according to claim 1, characterized in that the valve seat (5) and the counter-surface (14) as a single conical inner surface (15) of the main valve housing (2) are formed. Third hydrant main valve (1) according to claim 2, characterized in that the conical inner surface (15) of the main valve housing (2) is formed at an angle of 45 ° to the valve axis (4). 4. Hydrant main valve (1) according to claim 1, characterized in that the valve seat (5) and the counter-surface (14) as a first and second conical inner surface (16,16 <'>) of the main valve housing (2) and formed by a Step (17) are offset from each other. 5. hydrant main valve (1) according to claim 4, characterized in that the step (17) is designed as substantially parallel to the valve axis (4) extending. 6. hydrant main valve (1) according to claim 1, characterized in that the valve seat (5) as a first conical inner surface (16) of the main valve housing (2) is formed, wherein the counter surface (14) in one of the first conical inner surface (16 ) Deviating direction is tapered. 7. hydrant main valve (1) according to any one of the preceding claims, characterized in that the support part (9) and the holding part (10) relief structures (18) for better holding the seal (1 1) comprise. 8. hydrant main valve (1) according to claim 7, characterized in that the seal (1 1) is annular, wherein the holding part (10) comprises a substantially parallel to the valve axis (4) extending paragraph (19) having an inner radius the annular seal (1 1) defined. 9. hydrant main valve (1) according to claim 8, characterized in that the seal (1 1) in cross section on its sealing side (20) rounded and on its the paragraph (19) substantially adjacent inner side (21) is straight. 10. hydrant main valve (1) according to claim 8 or 9, characterized in that the seal (1 1) is designed as a closed ring. 1 hydrant main valve (1) according to any one of the preceding claims, characterized in that the holding part (10) by means of fastening elements (22) is reversibly connected to the support member (9), said fasteners (22) are selected from a group that Includes screws and pins. 12. hydrant main valve (1) according to one of claims 1 to 10, characterized in that the holding part (10) comprises a screw device (23) which is reversibly in a nut device (24) in the support member (9) can be screwed. 13. hydrant main valve (1) according to one of the preceding claims, characterized in that it comprises a valve guide (25) with guide ribs (26) for guiding the support member (9) in the direction of the valve axis (4). 14. hydrant main valve (1) according to any one of the preceding claims, characterized in that the supporting part (9) comprises a drainage seal (27). 15. hydrant main valve (1) according to any one of the preceding claims, characterized in that it has a nominal diameter (28) of 50 to 200 mm. 16. Hydrant main valve (1) according to one of the preceding claims, characterized in that the seal is made of polyurethane and has a hardness of 50 to 100 Shore, preferably from 60 to 90 Shore. 7