DE2654672A1 - STOP VALVE AND PROCEDURE FOR ITS MANUFACTURING - Google Patents

Description

Dipl .- (ng. Dip! .- Chem. Dipl.-Ing.

E. Prince - Dr. G. Hauser - G. Leiser

Ernsbergerstrasse 19

8 Munich 60

ROCKWELL INTERNATIONAL CORPORATION December 2, 1976 600 Grant Street

Pittsburgh, Pennsylvania 15219 / V.St.A. Our sign; R 918

Stopcock and process for its manufacture

The invention relates to a shut-off valve with a device for securing the position of the rotatable valve plug in the valve body and to prevent dirt or liquid from entering the interior of the stopcock, as well a particularly suitable method for its production.

A number of plastic stopcocks are known for use in distribution pipes of gas networks. These stopcocks are usually laid underground and thus exposed to groundwater and dirt, which causes the Operation of the tap can be disturbed. Cock training such as disclosed in U.S. Patents 2,505,270, 2,604,293, 2,844,353, 3,103,948 and 3,133,723 are not suitable for use under such conditions as the underside of the rotatable stopcock plug is exposed and therefore jammed can, so that the cock plug can no longer be rotated.

Some kind of seal at the bottom of the body is therefore necessary; Taps with appropriate seals according to the US PSen 2 433 966, 3 066 908 or 3 68? 416, however, are thereby regarding the formation of the body or the chick

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complex or comparatively expensive. Although these Taps are allegedly balanced by the sealing rings surrounding the plug above and below the flow channels, a pressure-tight zone below the plug creates a problem should the lower seal fail. then fluid pressure can act on the bottom of the chick and push or jam it out of the body so that a proper rotation is no longer possible. This condition is explained in US Pat. No. 3,350,057, which is a constructive one showing unbalanced cock. Securing the position of the cock plug inside the cock body against the pressure build-up Forces generated in the closed bottom area of the tap body requires the use of a strong pressure washer with assigned support.

As illustrated by the balanced stopcocks discussed above, Various and complex arrangements are used to keep the chick from moving axially in the body to back up. This is done, for example, by closing off the top and bottom of the body, by means of inclusion a top cover between the plug and the operating handle, by inserting a set screw or an adjusting pin in an aligned circumferential groove, by using a pair of snap rings on the exposed top and bottom of the plug or by threading of the chick in the floor area of the body.

An essential object of the invention is to provide a stopcock with a simple and reliable one Device for securing the position of the cock plug in the cock body against axial movements of the plug. It should the bottom side of the plug must be closed off inside the faucet body, while however fluid pressure is out of the area should be able to escape below the plug in the bore, which is caused by a failure of the seal below the flow

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channels could occur. Furthermore, the cock plug should be a Circumferential seal to avoid a. Entry of foreign bodies have in the top of the hole.

To solve this problem, the inventive Stopcock in a preferred embodiment has a valve body with a bore penetrating the body and a pair of the bore intersecting and substantially perpendicular to the flow channels. There is a in the hole Faucet plug arranged, which can optionally be rotated between an open position and a closed position to to bring a flow opening of the tap into and out of alignment with the flow channels of the tap body. One first circumferential sealing device between the cock plug and the bore above the flow opening and the flow channels and a second circumferential seal means therebetween the cock plug and the bore below the flow opening and the flow channels prevents fluid from flowing Inside the shut-off valve can escape and balanced fluid pressure can act on the valve plug. The inventive The shut-off valve is characterized in particular by the fact that the bore has a first circumferential groove on its inner surface has a semicircular cross-section. The cock plug has an opposite circumferential groove of semicircular shape Cross-section, which is provided on the outer surface of the cock plug, so that the two circumferential grooves form a circumferential channel between the cock plug and the bore. The cock body has a penetrating and opening tangentially into the channel opening, which serves to accommodate a flexible rod that extends through the Breakthrough extending through and around the circumference of the channel. A floor insert is below the plug in of the hole to close the underside of the plug inside the body. The ground insert points means for limiting the fluid pressure on the

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- if -

the underside of the stopcock can act if the second sealing device should fail. A circumferential sealing device on the cock plug prevents foreign bodies from entering the bore above the first circumferential sealing device.

One for the production of a stopcock according to the invention A particularly suitable method results from claim 11.

Further details, features and advantages of the invention emerge from the following description of an exemplary embodiment based on the drawing, in particular in connection with the additional claims. It shows

Fig. 1 is a partially sectioned side view of a stopcock according to the invention and

FIG. 2 shows a section along line 2-2 in FIG. 1.

As can be seen from Fig. 1, an inventive Stopcock 10 has a valve body 12 with a bore 14 penetrating it. A pair of flow channels 16 in the body 12 intersects bore 14 and is substantially perpendicular aligned with their axis. A cock plug 18 is in arranged in the bore 14 and can be moved between an open position and a closed position by means of a handle are rotated, · in which a flow opening 20 of the cock plug 18 is in or out of alignment with the flow channels is. The stopcock 10 also has a first circumferential seal device 22 between the plug 18 and the bore 14 above the throughflow opening 20 and the throughflow channels 16 and a second circumferential sealing device 24 between the cock plug 18 and the bore 14 below the Flow opening 20 and the flow channels. According to the preferred embodiment, each sealing device and 24 a pair of elastically deformable sealing rings,

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which are held in circumferential grooves of the plug 18 and on the Inner surface 26 of the bore 14 abut. The sealing devices 22 and 24 serve to prevent an escape of fluid from the interior of the shut-off valve 10 and to compensate for the fluid pressure acting on the plug 18.

In order to secure the cock plug 18 in the .Bohrung 14 position, is a first semicircular groove 2δ in the inner surface 26 of the bore 14 is provided. An opposite semicircular Circumferential groove 30 is in the outer surface of plug 18 arranged so that the grooves 28 and 30 form a circumferential channel form between the cock plug 18 and the bore 14, like this can best be seen in FIG. The body 12 is provided with a circular opening 24 which is tangential to the channel 32 is arranged. The actual position of the cock plug is secured by the introduction of a flexible Achieved rod 36, which corresponds essentially with play to the cross section of the channel 32 and through the opening is inserted around the channel 32. When the rod touches the plug 18 and the bore 14, there is an axial movement of the plug 18 in the bore 14 prevented.

This type of positional securing is similar to a pipe coupling as illustrated in US Pat. Nos. 2,597,482, 6,306,402 and 3,759; In the present case, however, this design is specially designed so that the plug 18 can be freely rotated in the bore 14 for proper actuation of the shut-off valve 10. Since, according to the preferred embodiment of the shut-off valve, the cock plug 18 and the body 12 are made of plastic, the rod 36 can also be made of plastic in a suitable manner. It should be noted, however, that the embodiment explained can also be used with advantage in the case of metal shut-off cocks and that the rod 36 can also consist of metal if the shut-off cock itself is made of plastic. In the preferred plastic training box, however, one end 38 of the plastic rod 36 is in the

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Arranged inside the opening 34. Around the cock body To keep tight, the end 38 could be heated so that it fuses with the body 12 and thus seals the opening 34. Instead of such a direct seal with the end 38, however, a sealing plug 40 is preferably provided. After the rod 36 has been inserted in such a way that the end 38 lies in a central region of the opening 34 comes, the sealing plug 40 is inserted into the opening 34 and fused to body 12 by heat to hold rod 36 inside the body and at the same time to seal the breakthrough 34.

Furthermore, it is of considerable advantage if the shut-off valve 10 is equipped with a device for closing off the bottom 42 of the Cock plug 18 is provided inside the body 12 in order to ensure proper operation even when laid underground guarantee. In the example case, a bottom insert 44 is provided for this purpose, which is inserted into the bore 14 below without play of the cock plug 18 is fitted. The bottom insert 44 is designed to limit the fluid pressure that is applied to the Bottom 42 of the cock plug 18 can act when the second sealing device 24 should fail. Without such a pressure limitation, failure of the second sealing device 24 the fluid pressure act on the bottom 42 of the cock plug 18 and exceed the securing effect of the rod 36, so that the cock plug 18 is pushed axially out of the bore 14 would. The limitation of the fluid pressure at the bottom while at the same time closing off the bottom 42 is achieved by that the bottom insert 44 is provided with a tubular extension 46 made of plastic, which along the Inner surface 26 of bore 14 runs downward and is slightly turned or beveled outwardly to rest resiliently against the inner surface 26. When the fluid pressure rises above the bottom drawer 44, it occurs a leakage flow around the circumference of the tubular extension 46,

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which relieves the pressure.

For the neat arrangement of the bottom insert 44 in the interior of the bore 14 while limiting the insertion path, the tubular Extension 46 is provided at its lower peripheral edge with an outwardly extending shoulder 48, which can be placed on the body 12 in the circumferential region of the bore 14 is. To ensure that the bottom insert 44 is held in the bore 14 against accidental removal, is the lower edge of the tubular extension 46 at the periphery of the bore 14 at a plurality of circumferentially at a distance from each other points 50 attached. The attachment points 50 are sufficiently separated to one To enable pressure reduction by moving the tubular extension 46 if necessary.

Furthermore, there should be a build-up of fluid pressure in the upper part of the stopcock 10 and the entry of foreign matter into the bore 14 from above can be avoided. Therefore, the stopcock 10 a simplified, less complicated compared to the proposal according to the earlier application P 26 41 931.8 Seal training in this area. The body 12 has a circumferential shoulder 52 at the top of the bore on, while the cock plug 18 is an outwardly widening has upper portion 54 in the vicinity of shoulder 52. The upper portion 54 and the shoulder 52 point opposing surfaces 56 and 58, respectively, which point inwardly towards a space 60 between the bore 14 and plug 18 above the first circumferential seal means 22 converge. A resilient sealing ring 62 surrounds the cock plug 18 and is normally under pressure against the opposing surfaces 56 and 58 to prevent foreign matter from entering the space 60 avoid. Should the first sealing device 22 fail, so the fluid pressure in the space 60 can be limited, since this

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the sealing ring 62 deflects outward and can thus be dismantled.

As the above description shows, the invention is not limited to the illustrated embodiment, rather, they are multiple modifications and changes, especially with regard to individual components and materials possible without departing from the scope of the invention. Instead of the cylindrical cock plug, a cock cone could also be used will. Furthermore, the guide channel for the rod 36 could be at any point along the axial extension of the stopcock plug and still act to secure the position of the stopcock plug.

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Claims (12)

Expectations Stopcock with a valve body and a valve body penetrating bore and with a pair of the bore intersecting and substantially perpendicular to the axis the bore lying channels, with a cock plug arranged in the bore, which optionally between a Open position and a closed position is rotatable and thereby a flow opening of the cock plug in alignment or out of alignment with the channels, and with a circumferential sealing device between the cock plug and the Bore above the flow opening and the channels as well as with a second circumferential sealing device zv / ischen the stopcock plug and the bore below the flow opening and the channels to prevent escape of Fluid from the interior of the stopcock and to compensate for the fluid pressure acting on the plug, characterized in that, that the bore has a first semicircular circumferential groove on its inner surface, that the plug has on its outer surface a second semicircular circumferential groove which, together with the first circumferential groove a circumferential channel between the plug and the bore forms that the tap body is circular in cross-section Has breakthrough that is tangential to the circumferential channel and that a flexible rod, which is essentially the Cross-section of the circumferential channel corresponds through the breakthrough and extends circumferentially along the connecting channel. 2. Stopcock according to / claim 1, characterized in that one end of the rod ends in a central region of the opening and that a device for sealing the opening is provided outside this end of the rod. 3. Stopcock according to claim 2, characterized in that the 709823/0353 2 6 5 A 6 7 2 Cock body, the cock plug and the rod are made of plastic and that the device for sealing the breakthrough has plastic part welded to the body. 4. Stopcock according to claim 1, characterized in that the rod is made of plastic and has one end which is welded to the valve body to seal the opening. 5 shut-off valve with a valve body and a hole penetrating the valve body as well as with a pair of channels cutting the hole and lying essentially perpendicular to the axis of the hole, with a cock plug arranged in the hole, which can optionally be rotated between an open position and a closed position and thereby brings a flow opening of the Hahnkülcens in alignment or out of alignment with the channels, and with a first ümfangsdichtung device between the chick and the bore above the flow opening and the channels and with a second Ümfangsdichtungeinrichtung between the plug and the bore below the flow opening and the Channels to prevent fluid from escaping from the inside of the stopcock and to compensate for the fluid pressure acting on the stopcock plug, characterized in that a bottom insert is inserted into the bore below the stopcock plug without play, which the bottom of the stopcock plug inside terminates ren of the faucet body, and that the bottom insert has a device for limiting the force acting on the bottom of the plug fluid pressure when said second sealing means fail, for which purpose the device for limiting the fluid pressure leakage of fluid from the valve body and out of the bore below the Chick allowed. 6. Stopcock according to claim 5, characterized in that the device for limiting the fluid pressure is tubular 709823/0353 .2- Plastic extension of the bottom insert or bottom has insert that runs along the inner surface of the bore down and expanded slightly outward is and bears resiliently on the inner surface of the bore. 7. Stopcock according to claim 6, characterized in that the tubular extension of the bottom insert on her lower circumferential edge has an outwardly extending shoulder which is intended to touch the body in the area of the Bore is aligned and limits the depth of insertion of the bottom shelf into the hole. 8. Stopcock according to claim 6 or 7, characterized in that the tubular extension of the bottom insert a has lower peripheral edge, which is located at a plurality of points in the circumferential direction at a distance from one another is connected to the body for fastening the floor insert in the bore. 9. Stopcock having a valve body and a bore extending through the valve body and a pair of channels intersecting the bore and lying substantially perpendicular to the axis of the bore, with one in the bore arranged cock plug, which is optionally rotatable between an open position and a closed position and thereby brings a flow opening through the plug into alignment or out of alignment with the channels, and with a first circumferential seal means between the plug and the bore above the flow opening and the channels and with a second Circumferential sealing means between the plug and the bore below the flow opening and the channels for Avoidance of fluid escaping from the inside of the stopcock and to compensate for the action on the stopcock plug Pressure, characterized in that a device for preventing penetration around the top of the cock plug of foreign matter in a space between the chick 709823/0353 and the bore above the first sealing device and to limit the fluid pressure in this space in the event of failure the first sealing device is provided. 10. Stopcock with a valve body and a hole penetrating the valve body and with a pair of the hole intersecting and lying substantially perpendicular to the axis of the bore channels, with one arranged in the bore Cock plug, which can optionally be rotated between an open position and a closed position and thereby a Brings the flow opening through the cock plug in alignment or out of alignment with the channels, and with a first circumferential sealing device between the chick and the bore above the flow opening and the channels and with a second circumferential seal means between the plug and the bore below the flow opening and the channels to prevent fluid from escaping from the interior of the shut-off valve and to compensate for the fluid pressure acting on the valve plug, characterized in that the Hahn body a circumferential shoulder surrounding the top of the bore has that the cock plug in the vicinity of the circumferential shoulder has a widening upper portion comprises that the upper portion and the shoulder have opposing surfaces that inwardly into Converge towards a space between the bore and the plug above the first circumferential seal means, and that a resilient sealing ring bearing normally under pressure on the opposing surfaces to prevent foreign matter from entering the space and to limit the fluid pressure in the space in the event the failure of the first circumferential sealing device is provided. 11. Method of manufacturing a stopcock with a tap body and a bore penetrating the tap body as well as 709823/0353 with a pair of the bore intersecting and substantially channels lying perpendicular to the axis of the bore, with a cock plug arranged in the bore, which optionally between an open position and a closed position is rotatable and thereby a flow opening of the cock plug in alignment or out of alignment with the channels, and with a first circumferential seal means between the plug and the bore above the flow opening and the channels and with a second circumferential seal means therebetween the chick and the hole below the flow opening and the channels to prevent fluid from escaping from the interior of the stopcock and to compensate for the on the plug acting fluid pressure, characterized in that in the inner surface of the bore a first, in cross section semicircular circumferential groove is attached that in the outer surface of the plug an opposite, is attached in cross-section semicircular circumferential groove, which together with the first circumferential groove a circumferential channel between the plug and the bore limits that a breakthrough with a circular cross-section is made through the valve body which is tangential to the circumferential channel, and that through the opening and over the circumference of the 'Circumferential channel a flexible rod is introduced, which corresponds to the cross-sectional formation of the circumferential channel with play. 12. The method according to claim 11, characterized in that according to the introduction of the flexible rod the circular opening is sealed. 709823/0353