DE2704381A1 - STOPCOCK - Google Patents

Description

Oipl-Ing Oipl.-Chem Oipl-Ing

E. Prince - Dr. G. Hauser - G. Leiser 2 V U 4 3 8 1

Ernsbergerslrasse 19

8 Munich 60

ROCKWELL INTERNATIONAL CORPORATION February 2, 1977

600 Grant Street

Pittsburgh, Pennsylvania / V.St.A.

Our sign; R 924

stopcock

The present invention relates to the improvement of stopcocks, in particular the improvement of shut-off cocks with a conical closure member, as described in the German Patent application P 26 47 878.4 are described.

Attempts have been made to reduce and / or eliminate the sticking phenomena that occur in such shut-off valves. The main focus in these attempts was
in doing so, on the elimination of disruptive deposits or

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Blockages that are critical when the stopcock is fully or partially open. Because of these investigations it is generally assumed that initially there is a pressure surge or a pressure spike in the line into which the stopcock is classified, and / or the weight of the valve plug can cause it to stick if it is arranged in an unfavorable manner; if the line pressure then decreases, a pressure that is high is established at the contact surfaces Frictional resistance between the housing and the IIahnket; el generated, which makes the shut-off valve extremely difficult is to close. It has therefore shown the need to form a stopcock in which the with a limited component towards the cone tip of the cock cone acting hydraulic forces and / or gravitational forces are turned off.

A primary object of the present invention is therefore to provide a cone which is rotatable in the cone bore arranged and adapted to block the faucet passage in the closed position and an opening for connecting of the passage, which in the open position of the Hahns connects to the passage, the Ilahnkegcl and the housing at the opposite cone ends chambers form, which help to create a dynamic equilibrium of the valve plug within the housing when the partial or fully open position by institutions with the kegcl opening are connected, further in the housing a pretensioning means are provided for the axial loading of the tooth cone in the direction of the further end of the cone, and wherein The improvement comprises shut-off means provided in the housing, which are in connection with grooves on the outside of the cone and allow pressurized seal lubricant to be fed into the grooves.

Another object of the present invention is to provide a stopcock which has a passage for a media stream as well as with one that intersects this passage

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comprises conical bore provided housing, wherein in the conical bore a Hahnkegcl is rotatably arranged, which for blocking the passage in the closure is formed and has an opening which comes in the open position with the housing passage in connection and releases it, with dos Ilahnkcgels on the outer surface Grooves are formed to which a pressurized lubricant can be fed via shut-off means arranged in the housing is.

Another object of the present invention is to provide a stopcock in which dos Hahnkegcls is formed at least one circumferential groove.

In addition, the aim of the invention is to provide a stopcock in which two on the outer surface of the Ilahnkegels Circumferential grooves are formed, one of which is located in the region of a cone end.

Another object of the invention is to provide a stopcock in which the shut-off means with the on the the narrower end of the tap cone is connected to the circumferential groove.

Another object of the invention is to provide a stopcock , in which the circumferential grooves are connected to one another by at least one groove running in the longitudinal direction.

Another object of the invention is to provide a stopcock in which the at opposite ends of the Cock cone chambers formed by this and the housing by at least one recess at each end of the cock cone are connected to the tap cone opening, with prestressing means in the housing for the axial loading of the tap cone are provided in the direction of its further end.

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Another object of the present invention is to provide a stopcock in which the shut-off device with the at the other end of the lug cone in the circumferential groove Connection.

Another object of the present invention is to provide a shut-off valve in which the shut-off device is screwed to the housing and a channel is formed in the housing which connects the shut-off device to the circumferential groove.

Another object of the invention is to provide a stopcock having a recess at each end of the cock cone is trained.

Another object of the present invention is to provide a drain cock in which all of them surround the cock cone Chambers are hydraulically connected and form means for exerting a force on the tap cone, which extends from the cone tip (i.e. in the direction from the narrower to the wider end) acts away. This force is so great that it counteracts the weight of the valve plug and the hydraulic auxiliary forces that occur in the event of pressure surges or pressure peaks in the line.

Another object of the present invention is to provide a highly effective and efficient stopcock with a dynamically balanced tap cone, which keeps the tap free from seizing.

Another object of the present invention is to provide a stopcock which overcomes inertia and thereby the Hahnkegcl in the axial direction inside of the housing is kept in equilibrium.

Another object of the present invention is to provide a stopcock with a housing that has a passage

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for the passage of a medium and a conical bore intersecting this passage, furthermore with one in the conical bore rotatably arranged cock cone which blocks the passage in the closed position and which has an opening, those in the open position associated with the passage can be brought and releases it, the cock cone and the housing at the opposite ends of the cone form chambers which can be connected to the cone opening by means of a device are so that a dynamic equilibrium of the cone within the housing in the partially or fully set Opening position can be established.

Another object of the present invention is to provide of a cock slide, in which a preload means in the housing for the axial loading of the cock cone in the direction of the further end of the cone is arranged.

Another object of the present invention is to provide a valve gate having the biasing means in the chamber is provided in the area of the narrower end of the Ilahn cone and loads the cock cone axially in the direction of the other chamber .

Another object of the present invention is to provide a valve gate in which the means for connecting the Chambers with the tap cone opening comprises at least one recess at each cone end, which the two chambers with the Connect cone opening.

Another object of the present invention is to provide a valve gate valve with two recesses at each end of the valve Hahnkegels.

Another object of the present invention is to provide a faucet valve in which the connecting means comprising the Connect the chamber with the tap opening in the center of the

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Cone and are arranged to run on its longitudinal axis.

Another object of the present invention is to provide a gate valve in which the pretensioning means has a cock cone is axially loading helical spring.

Another object of the present invention is to provide a valve gate having a shut-off device in the housing is provided, which is in connection with grooves on the outer surface of the Ilahnkegcls and the supply of a Pressurized seal lubricant is used in the groove, which prevents the üahnkegel in the event of a seizure can be raised in the conical bore of the housing to the further end.

Finally, another object of the present invention is to provide a valve gate valve in which the spring is opposite the longitudinal axis of the cock cone is arranged in the middle.

Further details and advantages of the invention emerge from the following description of the illustrated in the drawings preferred embodiments. Show it:

1 shows a partial section of a valve gate valve with a conical closure part,

Fig. 2 shows another partial section of the invention Faucet valve, in which the one shown in FIG

ο
The valve slide is turned about 9o,

Fig. 3 is a plan view of the valve gate shown in Fig. 1 and

FIG. K shows a section of an embodiment of the valve gate valve that is modified compared to the representation according to FIG.

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A valve gate valve Io is shown in the drawings. Of the Valve gate Io is, as experts know, extremely adaptable for a variety of applications and needs. So the inventively designed Gate valves, for example, in oil and gas production, in refining and transfer devices, Flow systems of all kinds and the like can be used.

The valve slide Io is provided with a housing 12. The housing 12 is typically formed as a cast part which has been reworked and otherwise suitably prepared for the operational insertion of the various tap parts. The housing 12 is designed to receive an end cap Ik . The end cap lk can be attached by suitable fastening means such as a series of threaded bolts 6
the housing be bcfestignar. With the end cap removed
can all essential parts, which are listed below
are to be used in the housing 12. This means that the pin 18, the coupling member or the compensating ring 2o and the Hahnicegel 22 can all be inserted into the housing or combined in the housing from the underside.

The pin 18 is rotatably arranged in the housing 12 and mechanically coupled to the compensating ring 2o. The compensating ring 2o for its part is mechanically connected to the cock cone 22, which is rotatable within a conical or conical boundary surface 2k in the housing 12. As can be readily seen, the rotation of the pin 18 causes a rotation of the cock cone 22 via the compensating ring 2o, which mechanically connects the pin 18 and the plug 22. The end cap lk is also provided with a threaded bore 28, into which a cone adjusting screw 3o and a protective cap 32 can be screwed. As the name suggests, the taper adjustment screw is used to adjust the axial position

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of the cock cone 22 within the housing 12. This setting takes place with the inclusion of a round Kogcland pressure ball J> k , which is held in a cavity 36 at the lower end of the cock cone 22 and on the ball seat 38. The ball seat 38 is dependent on the axial movement of the cone adjusting screw 3O | which moves the Ilahnkegel 22 in the direction of the tapered end, for example when screwing in relative to the end cap 1A.

A band seal ho can be provided around the junction between the housing 12 and the end cap l't, which seals the gap between these two parts from the outside. The sealing of this gap is further improved by a lubricating device which is arranged in a bore kS at the end of the cap lh and supplies the gap 42 with a lubricant under pressure. It should be noted that the lubricant completely fills the gap h2 and surrounds the threaded bolts 16, so that the threads of the threaded bolts are protected from all unfavorable substances or unfavorable environmental influences.

Between the end cap 1Ί and the housing 12 is about it In addition, a seal is provided by the sealing ring or the packing ^ 3.

As already mentioned, the pin l8 is rotatably held in the housing and also with an annular one Edge 48 is provided, an annular thrust bearing and one Seal 5o is applied. The seal 5o is complementary Groove 52 arranged, which is formed in the housing, wherein it completely encloses the pin l8. The cone can in the area of the axial bearing and sealing part 5o in a suitable manner with a self-lubricating plastic be coated like a polytetrafluoroethylene so that the turning properties are improved. The thrust bearing and Sealing part 50 is united with the pin 18 as soon as

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this is inserted through the lower end of the housing 12.

The main seal in the area of the pin 18 is effected by a series of sealing elements which are arranged on the housing 12 above the annular rib 5 ^. A characteristic arrangement of this packing or seals 56 is a Uneepac Ring Set manufactured by the Johns-Manville Company which has a number of flat bottom rings and regular rings. The seals 56 can be held in place by the trunnion rings 58 and 6o. The upper trunnion ring 6o lies in a typical manner on a trunnion cap 62, which is fixed in a suitable manner by fastening means, for example by a series of threaded bolts dk on the housing 12. The trunnion cap 62 has various tasks including securing the axial position of the trunnion rings 58 and 6o mentioned above and the seal 56 assigned to them. The sealing of the trunnion from the environment is also carried out by a weather seal 66, the typical seal being the "wiper construction" II, Type P "from Johns-Manvilxo is possible. Furthermore, the pin cap 62 serves as a reference stop due to the formation of a stop member 68. The stop member 68 cooperates with a stop collar 7o which is fastened to the pin 18 so as to be rotatable. The stop collar 7o has a cutout whose protruding edge regions 7 ^ limit the rotary movement of the pin to a certain angle at both ends of the cutout. The pin movement 18 is limited in that the stop collar 7o abuts the stop member 68 with one of the projection areas 7 ^.

As each of the sectional views of the valve gate shows, the housing 12 and the valve plug 22 form an upper chamber 76 and a lower chamber 78. To introduce a sealing

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Lubricant in the upper chamber 76, a check valve arrangement 80 is provided, through which the seal lubricant can be fed under pressure to this chamber. When flowing in and filling the upper chamber 76, the sealing lubricant also flows into axially extending grooves 82 and a circumferential groove 8k at the same time. As the name "Dichtungsschmicrmittel" implies, the material serves the dual purpose of lubricating the various operating parts of the valve Io and at the same time sealing the valve plug from the housing.

The valve gate Io is also equipped with a Pressure relief screw assembly 86 is provided which has a round ball 88 which is threaded in a partially threaded manner provided cavity 9o of the housing sits. The ball is held in the locked position by a threaded pin 92. The mode of operation of the relief screw assembly is explained below.

The present invention makes it insensitive to the seizure phenomena through the establishment of a dynamic equilibrium of the cock cone in the housing 12 as soon as the cock cone 22 is partially or completely in the open position, that is, as soon as the opening <) k of the cone 22 with the passage 96 of the housing 12 is in communication and thus releases this passage. The establishment of the dynamic equilibrium in the cock Io is achieved in that a first, axially extending recess 98 is formed in the cock cone 22, which connects the opening 9 ^ to the lower chamber 78, and that a second, axially extending recess Recess loo is formed in the tap cone, which connects the opening 9 ^ * with the upper chamber 76. The recess 98 can be offset with respect to the longitudinal axis of the Hahnkegcls 22, while the recess loo can run in the longitudinal axis.

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At this connection point it can be seen that the pressure occurring at the opening 94 occurs simultaneously in the upper chamber 76 and in the lower chamber 78 when the cock cone 22 is partially or completely open. Furthermore, the pressure present in the chambers 76 and 78 also exists at the narrower end Io2 of the cock cone 22 and the further end Io4 of the cock cone Preservation of the axial position of the cock cone in relation to the conical inner jacket surface 2k of the housing 12, even with pressure and temperature peaks. However, there is also a tendency towards slight pressure imbalances directed towards the tip of the cone, which are triggered by secondary forces. These secondary forces can be triggered by a number of different factors. For example, gravity can load the tap cone 22 in the direction of the tapered end as soon as the weight of the cone in the housing 12 has an unfavorable arrangement. A secondary force can also occur as soon as the faucet experiences a pressure surge or pressure spike, especially if the pressure in the opening 96 increases. With such a pressure increase, the pressure present in the side contact area between the cock cone 22 and the housing 12 lags behind the pressure present in the opening 9 ^ as well as in the chambers 76 and 78, whereby a force vector results which the cock cone 22 in the direction of the Seeks to press the point of the cone. This pressure lag and the displacement force have their maximum when the valve is fully open. To compensate for these secondary forces, the cock cone 22 is loaded in the direction of its longitudinal axis and away from the tip of the cone by a helical or spiral spring I06, which can sit in the longitudinal axis of the cock cone 22. The spring I06 is held on an extension I08 of the pin and, as mentioned above, rests on the cock cone 22, loading it. Therefore act on the cock cone 22 in effective

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Lichkcit does not apply any axial displacement forces as soon as a pressure and / or temperature peak occurs in the partially or fully open position. By preventing such an axial displacement of the cock cone, the seizure phenomenon is also eliminated in that the cock cone 22 maintains its axial position within the housing 12 and does not push it into the cone or cone cavity and thereby after a pressure or temperature peak has stabilized is fixed.

A round ball llo also sits in the second, axially extending recess loo. The ball, which is not loaded by the spring Io6, can move freely to and fro within the second axially extending recess and serves as a check valve to interrupt the flow of the sealing lubricant into the opening 9 ^ of the cock plug 22 when the sealing lubricant is under pressure enters the chamber . Is the round ball llo, however, then not necessary if the seal lubricant through a suitable valve arrangement is introduced directly into the sealing channel system rather than into the upper chamber 7ό · This is. K best understood when considering the Figure, in which those reference numerals, which correspond to the reference numerals of FIG. 2 are provided with a prime ('). The main difference between the valve slide according to FIG. 2, which is also the subject of the aforementioned German patent application P 26 47 878.4, and the valve slide according to FIG. 4 is the arrangement of the check valve 83 on the housing 12 'in a substantially below the upper chamber 76 'lying position. More precisely, the check valve 83 ', which can be designed as a ball check valve, is screwed into the housing 12' in such a way that it is in communication with the chamber, which in turn is in communication with the circumferential grooves 84 'which are on the outer surface of the cock cone 12 'are formed. It can be seen that thereby the whole under

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Sealing lubricant under pressure, which enters the check valve 83 and through the check valve, then enters the channel 85 and is then fed to the circumferential groove 8Ί '. When the sealing lubricant then enters the circumferential groove 84 ', it also follows the axially extending or longitudinally extending grooves 82', which are also arranged in the outer surface of the cock plug 12 'and connected to the circumferential grooves & k * , whereupon the sealing Lubricant enters the other of the circumferential grooves 8Ί ", that is to say in the circumferential groove in the region of the further end of the cock cone 12 '.

It has been found that the direct introduction of the seal lubricant in the circumferential grooves 84 'serves a number of purposes, including saving a lot of sealing lubricant, which is not required because the filling of the chamber 76 'is no longer required. In addition, that the lifting of the cock cone 12 'in the direction of the further end, if this does happen in an unfavorable case. necessary should be achieved through the use of pressures comparable to those used at the time of introduction of the seal lubricant through the upper chamber 76 ' will. In addition, there is an important advantage in feeding the seal lubricant directly into the Circumferential grooves 84 'in that the round shown in FIG Ball Ho is omitted. It is clear that by eliminating such a part, there is a risk of manufacturing malfunctions the cone balance is reduced.

As mentioned earlier, the various functional parts of the valve slide like the pin l8, the axial bearing and sealing part 5o, the compensating ring 2o, the spring I06, the ball Ho, the cock cone 22, the axial support ball 3 ^ for the cock cone etc. from the end of the housing through the opening closed by the end cap 1Λ can be used. This formation of the various parts enables one

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Maintenance of the trunnion seal 56 even if the tap is the Exposed to line pressure. In particular, the seal 56 can be removed even if the tap Io with the Line is connected and under pressure. The removal can be done in that the stop collar 7o of the Pin l8 removed and then the pin cap 62 from the Housing 12 is removed by loosening bolts 6 ^ 1. After removing the aforementioned parts, the seal 56 and the trunnion rings are exposed and can also removed. At this point in time, the main seal is carried out by the axial bearing and sealing part 5o. To the Ensuring the correct functioning of the axial bearing and sealing part 5o and thus enabling removal including the aforementioned sealing surface of the associated trunnion rings 60 and 62, the threaded pin 92 can be partially loosened, whereby the ball 88 from Seat lifts off. The operator can then report immediately whether the axial bearing and sealing part 50 is on the pin the complementary Xut 52 seals properly. When the thrust bearing and sealing part 5o fulfills its function sufficiently, the removal of the seal 56 can be started.

This creates a peculiar valve slide in which the seal lubricant introduced directly into the circumferential grooves is, whereby different parts of the tap are omitted, while at the same time achieved comparable lifting properties will.

It goes without saying that the invention is not restricted to the embodiments described above. Rather are Various modifications are still possible within the scope of the invention.

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Claims (10)

Expectations : Stopcock with a housing that has a passage for the flow of media and a passage having cutting conical bore, characterized in that in the conical Bore a Hahnkcgel is rotatably arranged, which closes the housing passage in the blocking position and which has an opening that is in the open position with the passage comes into connection and releases it, with grooves being formed on the outer surface of the cock cone are with a shut-off device provided in the housing for the supply of pressurized Seal lubricant related. 2. Stopcock according to claim 1, characterized in that on the outer surface of the cock cone at least one circumferential groove is formed. 3. Stopcock according to claim 1 or 2, characterized in that on the outer surface of the Hahnkegels -two circumferential grooves are formed by each of which has a groove in the area of one end of the cone. 4. Stopcock according to one or more of the claims 1 to 3, characterized in that the shut-off device with the in the narrower end area of the cock cone formed circumferential groove is in connection. 7 0 9 8 3 1/0 3 4 9 ORIGINAL INSPECTED 2 V ü 4 J 8 I. • «ι 5. Stopcock according to one or more of the claims 1 to 4, characterized in that the circumferential grooves run through at least one longitudinal end Groove are connected to each other. 6. Stopcock according to one or more of the claims 1 to 5 »characterized in that the shut-off device is designed as a check valve is. 7. Stopcock according to one or more of the claims 1 to 6, characterized in that _t that the valve cone and the housing at the opposite conical ends chambers form, wherein in each Kcgelende a recess is formed at least, the chambers connected with the cone opening and wherein in the housing biasing means for axial loading of the valve cone in the direction the further end of the cone are arranged. 8. Stopcock according to claim 3 _t, characterized in that the shut-off device is in connection with that circumferential groove which is formed at the further end of the cock cone. 9. Stopcock according to claim 6, characterized in that the check valve by a Screw connection is fixed in the housing and that a channel is provided in the housing, which the Check valve connects to the circumferential groove. 10. Stopcock according to claim 7 $ characterized by two recesses, one of which is formed at one end of the cock cone. 0 9 8 31/0 i 4 9 ORIGINAL INSPECTED