DE2715618A1 - Pipe connection for safety valve - has pair of sealing lips to receive ring projection of joint muff with watertight connection - Google Patents

Abstract

The pipe connection for use as a closure cap or a safety valve in pipes, has a watertight ring shaped seal (164) connected to a primary muff, (168) the seal having a ring-shaped recess (178) to take the ring projection (180) of a secondary muff (166). The recess narrows inwards, and forms two thin, flexible ring shaped lips (182) which encompass the inner and outer periphery of the ring projection (180). These lips (182) according to high or low inner pressure, either locate inwards or outwards on the projection (180) of the secondary muff (166). A coupling is provided to join the primary (168) and secondary muffs (166), the first muff's watertight seal (164) serving also to seal the secondary muff (166). According to the sealing requirement, the depth of insertion of the second muff (166) in the seal recess (178) is adjustable by the coupling.

Description

Pipe connector

The invention relates to a pipe connection, in particular as a blind plug, Closure cap or as a safety valve in pipelines, hoses or pipe-like Cables.

From US-PS 810 190 a pipe connection is already made of two sleeves known, which are screwed onto the pipe sections to be connected and be held together by a collar.

A seal of the known pipe connection takes place at the abutting one End faces of the two sleeves by a triangular cross-section approach # n one Sleeve that engages in a corresponding recess in the other sleeve.

From US Pat. No. 2,417,025 there is also an annular sealing ring known to be connected between the abutting end faces of two Sleeves lies. The two sides of the sealing ring are sloping in cross section inclined on the outside and lie in corresponding annular recesses in the end faces the sleeves. Further pipe connections with sealing rings are from the US patents 3,078,110 and 1,821,863 known.

In contrast, it is the object of the invention to provide a pipe connector to create that is able to withstand even extreme temperatures and / or pressures.

To solve this problem, a pipe connector is used, which is characterized by an annular ring-shaped connection connected in a watertight manner to a first sleeve Seal with an annular recess for receiving an annular extension a second sleeve, the recess tapering inwardly in cross section and two spaced apart, the inner and outer circumference of the Thin, flexible and ring-shaped lips surrounding the annular process of the second socket forms, which at high or low internal pressures either inwards or after on the outside of the ring extension of the second sleeve, and through a coupling device for connecting the first socket to the second socket and for sealing the second Socket with Help with the calibration, depending on the sealing requirement the depth of penetration of the second sleeve into the recess of the seal by the coupling device is adjustable.

The invention is explained in more detail below with reference to figures; The figures show: FIG. 1 a sectioned perspective illustration of an embodiment the pipe connection according to the invention; Figure 2 is a perspective view of a another embodiment of the pipe connection according to Figure 1; Figure 3 is a sectioned perspective Illustration of another embodiment of the invention; Figures further embodiments the pipe connection according to 4 + 5 Figure 3; Figure 6 is a perspective view similar to Figure 3 of another embodiment of the invention; Figure 7 a sectional perspective view of a further embodiment of the pipe connection according to Figure 6; Figure 8 is a plan view of another embodiment of the invention Pipe connection; Figures are sections along the lines A-A and B-B of Figure 8; 9 + FIG. 11 shows an enlarged partial view from FIG. 8; Figure 12 is a view of a another embodiment of the invention according to Figure 8; FIG. 13 along a section the line A-A of Figure 12; FIG. 14 is a view according to FIGS. 8 and 12 of FIG another embodiment of the invention; Figure 15 is a longitudinal section through the pipe connection according to Figure 14; FIG. 16 a longitudinal section by the embodiment according to Figure 15; Figure 17 is a vertical section through a safety valve sealed according to the invention; FIG. 18 a perspective sectional illustration a hose connection according to the invention; Figure 19 is a longitudinal section through a further embodiment of a pipe connection according to the invention; and Figure 20, respectively Figures 21 and 22 are a top view, a side view, and an end view of another Embodiment of a lock for the pipe connection according to the invention.

Figure 1 shows a pipe connection for two end faces with each other to be connected pipe pieces with two inner sleeves 20 and 22 for fastening the Inner end of two pipes, not shown, to be connected, one of the inner ones Annular seal 24 carried by sleeves 20 and 22 and two outer connecting sleeves 26th and 28 with interlocking threads which connect the inner sleeves 20 and 22 to the Hold seal 24 together.

The two sleeves 20 and 22 are essentially identical.

They each have internal threads 30, 32 at their outer ends Attachment to the pipes to be connected. On each sleeve are flats 34 and 36 intended for attaching a wrench. Furthermore, the sleeves an annular groove 38 or 40 on its circumference for the use of a spring ring 42 and 44 respectively. The spring washers are connected to one another with the aid of a wire 46.

The sleeves 20 and 2-2 each have an inner end region 48 and 50, the obliquely converging inner and outer surfaces 52 and 54 or 56 and 58 owns. It can be seen that these inner end regions are in the annular seal 24 intervene. The shape of the seal 24 is described in more detail below.

Each of the sleeves 20 and 22 has one facing away from the end region Ring shoulder 60 or 62, which is between the end region 48 or 50 and the annular groove 38 and 40 respectively. Corresponding shoulders of each lie on these ring shoulders associated outer connecting sleeve 26 and 28, respectively. As mentioned, the connection sleeves are 26 and 28 screwed together. The connecting sleeve 26 has an annular shape Inner end 64, which is received in an annular space 66 provided in the connecting sleeve 28 will. The inner end 64 and and the annular space 66 carry multiple threads.

The internal threads 30 and 32 of the sleeves 20 and 22 are used for assembly with the seal 24 and the threads of the connecting sleeves 26 and 28 with one another engaged. By turning one of the connecting sleeves 26 or 28 opposite the other, the inner sleeves 20 and 22 because of the abutment to the Ring shoulders 60 and 62 pressed against each other. As a result, the sleeves 20 and 22 sealingly drawn into the annular seal 24 and held therein. Multi-course Threads 68 are used for greater axial mobility of the connecting sleeve 26 with respect to one another the connecting sleeve 28 upon a certain rotation of one of the sleeves. A multi-course Thread thus allows faster and easier assembly or disassembly of the Pipe connection as a single thread.

Each of the connecting sleeves 26 and 28 has an outer collar 70 and 72 on. Each collar 70 or 72 has a number of axially extending ones on the circumference Wedge teeth 74 and 76, which are used to fasten the connecting sleeves by hand or with Make it easier with the help of a wrench. The splines are also for that Attack of tension chains suitable for the assembly of difficult to access Pieces of pipe or pipes that have to withstand high pressure are used will.

The two connecting sleeves 26 and 28 are against rotation by means a locking element 78 secured between the collars 70 and 72. The locking element 78 has a conical outer end for insertion into one of the circumference of the Collar 72 provided wells 80 on. The locking element 78 is on one end a spring pin 82 which is seated in an axial bore in the collar 70 and has barbs 83 reaching into the inner wall of the bore. The feather pen is dimensioned so that its outer end is slightly over when the pin is fully inserted the collar 70 protrudes to permit the locking element 78 to be released and reinserted allow. The spring pin can be pressed in using a screwdriver, for example while pliers are required to loosen them. The collar 70 has three Similar axial bores, of which only one is shown, which is used for Receiving the spring pin 82 are suitable.

Figure 1 also shows an extension 84 on the outer end face of the collar 70 next to the bore containing the spring pin 82. A second one doesn't the similar extension shown is on the end face at the opposite end the hole provided. Two other similar pairs of appendages are besides the the other two bores are provided on the collar 70, but they are not shown in FIG visible. The three pairs of appendages are evenly around the circumference of the collar 70 distributed and are next to the holes for the Spring pin. The holes, however, are not evenly distributed, but there are two of the Bores slightly offset in relation to the projections 84 to different degrees, so that the three bores with respect to the depressions 80 in the collar 82 are not are always in the same place. The blocking element 78 can thereby be offset if it is not exactly aligned with a recess; thus is always an approximate Alignment of recess and spring pin can be achieved. On the other hand, however, can also a spring pin sit in each hole, each with a recess aligning pin is pressed into the recess. On the outer face of the Collar 72 are also similar extensions 86, as the extensions 84 are provided, although the collar 72 has no axial bores.

The extensions 84 serve to protect against injuries caused by the spring pin 82. They also serve as a fulcrum or fulcrum for one on one of the connecting sleeves 26 or 28 separately applied screwdriver, if the corresponding connection sleeve with greater effort than should be turned by hand. Each of the connecting sleeves has a transverse groove 88 near the extensions for the use of a screwdriver. For example, the end of a screwdriver can be inserted into the transverse groove 88, so that the spring pin 82 of the screwdriver acting as a lever inwards can be pressed.

Figure 1 also shows a slotted pin 90 which, instead of the Spring pin 82 and the locking element 78 can be used. The pin 90 is a hollow cylinder with a longitudinal slot 92. The edges of the slot are designed as barbs. The pin has a head 94 at the outer end.

Such pins are described in U.S. Patent Application No. 571,835.

The annular seal 24 will now be described.

It has an annular groove 96 on its outer surface; in the axial direction it is fixed with the help of three spring pins 98 that go through the connecting sleeve 26 protrude into the annular groove 96.

The spring pins 98 are uniform around the circumference of the coupling sleeve 26 and are in the shape of the slotted pin 90, but they are somewhat shorter.

On the two opposite sides of the seal 24 are annular Recesses 100 and 102 are provided which taper inwardly in cross section and substantially the shape of the inner end portions 48 and 50 of the respective inner ones Socket 20 and 22 respectively. Each recess forms two relatively thin ones and flexible annular lips 104 and 106, respectively.

108 and 110. The lips of each pair lie on the respective inner and outer surfaces of the respective sleeve 20 or 22.

This seals each of the two inner sleeves. As the lips are flexible, the effective sealing surface can be created by sliding the inner Sleeves are enlarged. the Penetration depth of the sleeves in the recesses can be easily adjusted by turning the outer connecting sleeves 26 and 28, respectively. For a greater sealing effect, the connecting sleeves 26 and 28 are therefore more tight screwed against each other. At relatively low pressures inside the pipe connection need the sleeves 20 and 22 penetrate only a little into the recesses of the seal 24, while at higher pressures a deeper penetration is required.

It should be noted that the pipe connection according to the invention is an effective seal in which each pipe connector is connected to two annular Sealing surfaces is sealed. This results in each pipe connector or each sleeve a labyrinthine seal. The sealing surfaces can also have an additional Have sealant coating.

Another sealing effect is created by the interaction of the external Connecting sleeves 26 and 28 achieved with the respective inner sleeve 20 and 22, respectively.

Another advantage of the flexible lips of the seal 24 is that that these deform and thereby the sealing effect under the action of fluid pressure strengthen. For example, a high pressure fluid exerts radially outward on the inner surface the seal 24 acting forces. These press the inner flexible lips 104 and 108 of the seal 24 tighter against the sleeves 20 and 22, respectively. At low pressures or in the case of vacuum operation, on the other hand, the outer lips 106 and 110 after inside also pressed against the sleeves 20 and 22.

The individual components of the pipe connection according to the invention are made of metal. The serving for pipe fastening inner sleeves 20 and 22 are for Reduction of the frictional resistance from a different metal than the seal 24. In addition, the coefficient of thermal expansion of the sleeves 20 and 22 is different than for the seal 24. The coefficients of thermal expansion are depending on the expected Operating conditions selected. The inner sleeves expand during high temperature operation 20 and 22 faster and stronger than the seal 24, so that the inner end regions of the sleeves pressed against the outer lips 106 and 110 of the seal 24 in a strongly sealing manner will. When operating at low temperatures, the inner sleeves will pull in a similar manner more together than the seal 24, so that they against the inner lips 104 and Press 108. With a pipe connection according to Figure 1 could be up to a temperature from -1960C at a pressure of 2.8 atm, a pipe can be connected in a sealing manner.

Suitable substances for the pipe connection according to the invention are: S.S. 304 titanium 55A Nitronic 40 titanium CAL-4V Inconel X-570 aluminum 7075 Inconel 718 silver Ph13 - 8M0 copper superalloys Jaytrex 1000 the Dashed lines 112 and 114 in Figure i indicate that each of the two sleeves 20 or 22 may have a sealed outer end. In that case would be natural no internal thread provided. The pipe connector is then used as a sealing cap, For example, it can be used for a tap in a distribution line. Possibly For example, the sealing cap can be provided with a vent hole 116.

It should be noted that instead of that shown in FIG inner sleeves a large number of differently constructed sleeves can be used. For example The sleeves can have welded-on bottoms, welded-on ends, tubular ends and Have sleeves with expansion joints according to Figures 7 and 16.

Figure 2 shows another embodiment of an inner sleeve for a gas threaded connector. This sleeve is provided with the reference numeral 118 and has a straight internal gas thread 120 on. The gas thread terminates in a 450 internal taper 122 for engaging a corresponding gas pipe outer cone onto which the socket is screwed. Furthermore the sleeve 118 corresponds to the inner sleeve 20 or 22 from FIG.

Figure 3 shows a pipe connection with an annular seal similar to FIG. 1, which is intended exclusively for mechanical assembly is. Such a pipe connection is mainly for pipes with a larger diameter, for example over 5 cm, thought.

The sleeves 124 and 126 shown in Figure 3 are with an annular Seal 128 in engagement, which corresponds to the seal 24 from FIG. For extreme high pressures in one embodiment of the invention is a support sleeve 129 around the seal 128 provided. The support sleeve also acts as a spacer to protect the seal against high screw pre-stresses occurring during assembly.

The sleeves 124 and 126 each carry opposing outer ones Flanges or collars 130 or 132, which are connected to one another with a number of Allen screws 134 are screwed. The screws sit in aligned threaded holes 136 and through holes 138 in the respective flange. The outside surface of each Allen screw head has a number of axial keyways 140 that are used to hold the socket head screws secured against twisting. A barbed hook is used to secure it Spring pin 142, the shape of which corresponds to the slotted pin 90 from FIG. The spring pin 142 has a flange-shaped head 144 with a gap 146 at the Place of its axial slot (see. Slot 92 in Figure 1). The gap 146 forming edges are substantially radial with respect to the spring pin and engage in a locking manner in the keyways 140 of the Allen screw.

The inner end portions of sleeves 124 and 126 are axially parallel to one another Ring extensions 148 and 150 according to the inner end regions of the Sleeves from Figure 1 formed. These extensions access the based on figure 1 into the annular seal 128.

In the embodiment shown in Figure 3, the outer ends are 152 or 154 of the sleeves prepared for welding to the pipe sections to be connected. It is clear that the sleeves can also be used in other ways for connection to the pipe sections can be prepared. Thus, FIG. 4 shows a sleeve 156 with a weld-on socket 158 at one end. Figure 5 shows another sleeve 160 with an internal pipe thread 162 for connection to a pipe section. Otherwise correspond to those in FIG 4 and 5, the sleeves 156 and 160 shown the sleeves according to FIG.

It should be noted that the sleeves shown in Figure 3 can be produced in different diameters. The number of to connect the Allen screws used for both sockets depend on the diameter of the pipe connection away. The gap G between the flanges 130 and 132 is a measure of the strength the pipe connection. The size of this gap is in factory tests at complete tightened pipe connection detectable. When assembling is the required space easily with the help of a feeler or a corresponding gauge or if necessary lockable with a screwdriver blade. Strength is similar the pipe connection according to Figure 1 can be checked.

Figure 6 shows another embodiment of the pipe connection according to the invention with a different seal. The pipe connection comprises two pipe connection sleeves 166 and 168, the outer ends of which correspond to the sleeve 156 of FIG. The sleeves have outer flanges 170 and 172, which by means of Allen screws 174 according to Figure 3 are screwed together.

An annular seal 174 lies in a correspondingly shaped one Annulus 176 at the inner end of sleeve 168. Seal 164 and annulus 176 have a matching, tapered cross-section. The seal 164 lies at the end of the sleeve 166 and surrounds with an annular recess 178 a corresponding annular extension 180 of the inner end of the sleeve 166. It will noted that the recess 178 of the seal 164 on both sides of the Extension 180 forms relatively thin flexible lips. On the walls of the annulus 176 in the socket 168 are inner and outer clearances C. and C0 for deformation the flexible lips provided. The inner free space C. forms a shoulder 182, via which the seal 164 snaps when inserted into the annular space 176.

This shoulder holds the seal in the annulus. For easier removal of seal 164 is a number of blind holes 184 internally threaded across the bottom of the recess 178 distributed in the seal 164, in which to pull off the seal 164 bolts can be screwed in from the annular space 176, provided for example the seal needs to be replaced or repaired.

Figure 7 shows another embodiment of the pipe connection socket for a pipe connection according to Figure 6. The reference numerals provided with a prime denote the parts that correspond to FIG.

The pipe connection socket shown in Figure 7 comprises two halves 166a 'and 166b', which are connected by a metallic bellows 185. Of the Bellows allow a longitudinal expansion and contraction of the entire sleeve to easier assembly and disassembly of the pipe connector between fixed Pipe pieces. In addition, with the help of the bellows, a pipe connection is between pipe sections that are not in alignment are possible.

The bellows is preferably made of S.S. 321, Inconel X-750, Inconel 718 or Titan 55A. The bellows is surrounded by a casing 186, the higher one Permits pressures and prevents chafing. The casing lies in an annular space 187 in the sleeve half 166b and is firmly connected to this. The corrugated part of the bellows 185 lies in the annular space 187, the ends of the bellows with both Halves of the sleeve are connected.

The two halves 166a 'and 166b' are innumerable more rounded Teeth 188 coupled together. It should be noted that these teeth are a allow axial displacement of the two sleeve halves. To connect not aligned pipe pieces, the teeth are convex. To prevent a A spring pin 189 is similar to excessive expansion or indentation of the bellows the slotted pin 190 from Figure 1 is provided, which radially into an outer annular groove in the socket half 166a 'protrudes. It should be noted that the indicated in Figure 7 Gap G1 an axial pushing together of the sleeve halves, for example to free them of the ring extension 180 'provided on the sleeve half 166b' from a corresponding one Recess in another pipe connection socket of the pipe connection according to the invention permitted for permanently installed pipe sections. There is an annular gap around the casing 186 C for bending of the bellows during dismantling or installation the pipe connection or for angled pipe connections.

Although the sleeve shown in Figure 7 at the free end of the sleeve half 166a 'has a weldable pipe socket, other common types of connection are also possible conceivable.

Figures 8 to 11 show a pipe connection with a similar structure like the pipe connection according to FIG. 1. In FIG and 192 and the outer connection sleeves 194 and 196. The connecting sleeves wear outer ring flanges or collars 198 and 200. As in the pipe joint according to FIG. 1, the locking sleeve 194 sits in a recess in the connecting sleeve 196, and these two connecting sleeves are by means of a multi-start thread screwed together. The inner face of the coupling sleeve 196 is in FIG. 8 is provided with the reference number 202. This face has a number of ratchet teeth 204 which extend radially over the connecting sleeve 196 and have the shape shown in FIG. The ratchet teeth 204 are also can be seen in FIG. A pawl 206 is pivotable on the connecting sleeve 194 fastened between the ring flanges 198 and 200 and with a claw 208 for engagement provided with the ratchet teeth 204. The claw 208 is related to the pipe connection arranged essentially radially.

The pawl 206 is loose on a flanged spring pin 210 mounted, which sits radially in the connecting sleeve 174 and also for fixing the seal 212 according to FIG. 10 is used. For additional position fixing of the seal 212 two further spring pins 214 are provided.

The spring pin 210 is inserted in an oval hole in the pawl 206, whereby it can be displaced to a limited extent with respect to the spring pin 210 is. The spring pins 210 and 214 correspond to the slotted pin 90 from FIG 1.

The pawl has two opposing radial extensions 216 and 218. The extension 216 lies in a corresponding one Recess on the inner end face of the annular flange 198 of the connecting sleeve 194. This Extension forms a lever point for the pawl. The other opposite Extension 218 of the pawl 206 protrudes somewhat over the annular flanges 198 and 200 and is hand in the direction of arrow 224 to disengage pawl 208 from the pawl teeth 204 movable. The pawl 208 is typically one against the pawl 206 pressing leaf spring 226 pressed against the pawl teeth 204. The leaf spring 226 is curved in the front view according to FIG. 10 and is held by two spring pins 228 of a shape similar to the slotted pin 90 on the face of the annular flange 198 held.

Figure 11 shows the profile of the ratchet teeth 204. The tip of the Claw 208 is shown in engagement with ratchet teeth 204. The arrows 230 indicate the direction of the relative movement of pawl 208 and pawl tooth 204 when tightening the pipe connection. It should be noted that the ratchet teeth 204 are profiled such that a relative movement of the claw 208 and ratchet teeth 204 against the direction of the arrows 230, so when loosening the pipe connection, the Tip of the pawl 208 toward the tip of the engaged ratchet tooth 204 shifts, the spring force acting in direction 230 being increased. the Claw 208 will slide up on the respective pawl tooth 204, What entails tightening. The angles CL and β shown in FIG. 11 are chosen so that the tip of the claw 208 tends to be in the outer surface of the respective ratchet tooth 204 to dig.

The tooth profiles are chosen so that when tightening the pipe connection the pawl 208 slides over the tips of the ratchet teeth 204, with each Pawl tooth the pawl is pressed slightly against the leaf spring 226. at When the pipe connection is fully tightened, the pawl teeth 204 and the Claw 208 together in the manner described and prevent loosening of the pipe connection. If the pipe connection is to be released, the pawl 206 is manually brought out of engagement with the ratchet teeth 204 with the aid of the extension 218. The pawl allows a controlled, gradual and safe release of the Pipe connection for a pipe that may still be under pressure. Provided required, a remote release of the pawl is also required 206 possible with the help of tension chains or special actuating devices. In another embodiment, instead of the ratchet teeth 204, there is a rough end face on the coupling sleeve 196 for engagement of the pawl 208. Such a one The surface can be produced, for example, with the aid of investment casting technology. The frictional connection between this surface and the pawl there is also radial incisions reinforced instead of the ratchet teeth 204.

FIGS. 12 and 13 show a pipe connection similar to that in FIG Figures 8, 9 and 10 shown embodiment, but with a different pawl. Identify the reference symbols provided with a prime in FIGS. 12 and 13 corresponding parts from FIGS. 8 to 10.

In the embodiment according to FIGS. 12 and 13, the pipe connection grips two connecting sleeves 194 'and 196' which are connected to one another in the manner previously described are connected. The connecting sleeves each have an annular flange 198 'and 200 ', with an annular on the inner end face of the connecting sleeve 196 arranged number of ratchet teeth 204 'according to the embodiment described above is provided. The pawl consists of one on the inner face of the connecting sleeve 194 'with the help of two spring pins 234 attached curved Leaf spring 232. The free outer end 236 of the leaf spring 232 is in the side view substantially S-shaped and has a claw 238 at its outer end, which with engages the ratchet teeth 204 'of the coupling sleeve 196'. One recognises, that the curvature of the S-shaped end 236 of the leaf spring 232 has an angle of attack for the pawl 238 with respect to the ratchet teeth 204 'so that the pawl acts like a pawl and a twisting of the connecting sleeves 196 'and 198' Allowed to tighten the pipe union while loosening the pipe connection is prevented. The spring action of the leaf spring is normally used for pressing the pawl 238 to the ratchet teeth 204 '.

FIG. 13 shows the counter-axial movement by four spring pins 242 retained seal 240 with spring pins 242 in the coupling sleeve 194 'provided tangential bores with respect to the circumference of the seal 240. The tangential bores are aligned with an outer annular groove 244 in the seal 240 according to the annular groove 96 from FIG. 1. The spring pins 242 correspond to the spring pin 82 according to Figure 1 in such a way that barbs to prevent removal the spring pins are provided from the tangential bores. As mentioned, be the spring pins used in pairs; they are used so that the barbs each of a pair of pins point in opposite directions and thereby a exert mutual holding effect. It should be noted that the position security the seal with the aid of tangentially arranged spring pins according to FIG. 13 as well can be done with the help of radially arranged spring pins.

Figures 14 and 15 show a pipe connection with a pawl similar to the embodiment shown in FIGS. Denote with Parts in FIGS. 8 to 10 corresponding to parts with reference numerals provided with two lines.

The pipe connection shown in Figures 14 and 15 comprises two inner ones Sleeves 190 "and 192" which engage a seal 246 to be described. Two outer connecting sleeves 194 and 196 "are by means of a multi-start thread screwed together and press the inner sleeves 190 "and 192 "against each other. The outer surfaces of the connecting sleeves 194" and 196 "are in This version is corded, but axial ones can also be used for remote screwing Keyways may be provided. Instead of the pawl teeth 204 ″ can also be used in this Execution a roughened surface according to the embodiment shown in Figures 8 to 10 be provided.

The inner end face of the connecting sleeve 196 ″ has an annular shape arranged number of ratchet teeth 204 ″, for their engagement a pawl 206 "is provided. As in the embodiment according to FIGS. 8 to 10, the pawl is 206 "biased by a leaf spring 226" against the pawl teeth 204 n and unlockable by hand. The seal 246 has approximately the shape of the execution according to FIG. 6 and is seated in an annular space 248 in the sleeve 192 ″. The seal 246 has on its outside an annular recess 249 for receiving a corresponding annular extension 252 of the sleeve 190 "is used. As in the Execution according to Figure 6 are on the outside of the formed by the seal Lips are provided in the sleeve 192 "internal and external clearances 256 and 254. At In the embodiment according to FIG. 6, the seal was replaceable, while in the embodiment According to FIG. 15, the seal 246 is fixedly mounted in the sleeve 192 "and only together is interchangeable with the sleeve.

FIG. 16 shows another embodiment of the one shown in FIG Sleeve 192 ". The sleeve 192" consists of two by one according to this embodiment Bellows 252 connected halves 250 and 251, which have a change in length and angle of the parts to be connected in the manner described in connection with FIG. The bellows is preferably made of a material described with reference to FIG.

The bellows 252 lies in an annular space 253 in the sleeve half 251 and, as before, is surrounded by a sheath.

The axial displacement of the sleeve halves 250 and 251 is through the spring pin 254 seated in an outer annular groove in the sleeve half 250 is determined. The axial width of this groove determines the free path of movement of the sleeve halves.

FIG. 17 shows a safety valve according to another embodiment of the invention, wherein the safety valve has a fastening sleeve 258 with a Passage 260 for inflowing fluid and one with the aid of an annular seal 264 has coupled cap 262. It should be noted that the seal 264 is shaped similarly to the seal according to FIG. She has a tapered one each annular recess 266 or 268 in each side surface. The sleeve 258 has a correspondingly shaped ring extension 270 which engages in the recess 266. Similarly, the cap 262 has a protruding ring extension 272, the seated in the upper annular recess 268. One outer connecting sleeve 274 encloses the seal 264 and is on the sleeve by an annular shoulder 276 258 held against upward movement. Three spring pins 278 extend radially inward through sleeve 274 and engage with their inner ends in an outer annular groove 280 of the seal 264, whereby this is fixed in the axial position is.

The sleeve 274 forms around the seal 264 an annular space 282, which over two openings 284 and 286 provided in the cap 262 are in communication. It it should be noted that, of course, instead of two openings one or more openings can be provided.

A rod 286 protrudes from the center of the cap through a bulkhead 288 in the sleeve 258. The transverse wall 288 has holes 290 for inflow into the free space 292 Fluid. At the lower end of the rod 286 is a collar with the aid of a spring pin 296 294, and between the underside of the transverse wall 288 and the collar 294 a compression spring 298 is mounted. This causes the cap to seal on the seal 264 pressed down.

The collar 294 has a number of axial recesses on its circumference 289 for flow around the collar when the pipe is connected to the socket 258.

In operation, fluid flowing into sleeve 258 penetrates through the openings 290 into the free space 292. If the fluid pressure exceeds the spring force of the compression spring 298 exceeds the cap 262 lifted from the seal 264, and fluid flows under the annular extension 272 via the seal 264 in FIG the outlet openings 284 and 286 of the cap 262. These outlet openings are internally threaded for connecting pipes.

It should be noted that the opening pressure of the safety valve depends on the choice of compression spring 298.

Different springs can therefore be selected for different pressures. In Another embodiment of the invention is the effective length of the spring for example adjustable by changing the position of the collar 296 on the rod 286.

An ejector disk 300 in serves as a further safety device the cap 262, which via a channel 302 with the interior 292 of the safety valve connected is. For example, if the cap 262 is wedged in the sleeve 258, the fluid pressure in the interior 292 pushes the ejection disk 300 out of the cap 262.

FIG. 18 shows a pipe connection according to the invention for two pieces of plastic hose with a seal 304 shaped similarly to the seal 24 according to FIG. 1. The seal 304 is annular and has a tapered cross-section on each side annular recess. The two pieces of tubing are labeled 306 and 308. Their inner ends are provided with pipe connectors, and each piece of hose carries an inner sleeve 310 or 312 and an outer one Connecting sleeve 314 and 316, respectively. The inner sleeves 310 and 312 are on the respective hose section and are automatically bent on this when the connection is tightened.

The automatic bending takes place when the inner ones are pulled together Sleeves 310 and 312 by twisting the outer connecting sleeves 314 and 316. At this inward movement becomes the inner lips 304a and 304b in FIG pressed the respective hose pieces, whereby these outwards into the annular Shafts 311a and 311b are pressed. The inner sleeves 310 and 312 wear on theirs inner ends of outer flanges 318 and 320, respectively, attached to respective shoulders 322 or 324 of the outer connecting sleeves. The two outer connecting sleeves are provided with cooperating threads 326.

The inner ends of the hose pieces are used to assemble the hose connection butt cut and the outer connecting sleeves 314 and 316 first over the corresponding hose pieces are pushed, after which the respective inner sleeve 310 or 312 is used. Then the outer connecting sleeves 314 and 316 screwed together and tightened until the hose pieces are tight with the seal are engaged. The inner and outer sleeves 310, 312, 314 and 316 are preferably made of a relatively soft lathe machinable Metal. Seal 304 is made of a similar material. In other versions some or all of the parts are made of plastic.

For softening thick plastic pipes for easier connection According to FIG. 18, hot air cannons or hot water jets are preferably used.

Figure 19 shows a further embodiment of the pipe connection according to the invention, wherein the seal is integrally molded with a mounting sleeve. The two Pipe sections to be connected are designated by 328 and 330 and with the respective Socket 332 or 334 welded. The sleeves are by means of multi-start threads 336 screwed together and secured against rotation by three spring pins 338.

The sleeve 332 has a molded seal on its inside, consisting of two concentric ring processes, which are relatively thin and form flexible inner and outer lips 340 and 342. Is between the lips an annular recess 344 tapered in cross section is formed.

The cross-sectional shape of the recess 344 corresponds essentially a ring extension provided at the inner end of the opposite sleeve 334 346.

The dash-dotted lines 348 and 350 indicate that each of the sleeves can be closed for use as a shut-off cap or stopper. It will care pointed out that the sleeves can also be used in other ways, for example by weld-on sockets or internal thread, can be connected to pipe sections. The figures 20, 21 and 22 show another embodiment of the one shown in FIGS. 8-11 Locking device for the pipe connection according to the invention. She is in the characters 20 and 21 in connection with the pipe connection and shown alone in FIG. In FIGS. 20 and 21, the two collars cooperating with the locking device are shown or flanges designated 350 udd 352. The flanges carry a number of axial ones Keyways 354 and 356 on their periphery. The inner sleeves are labeled 358 and 360.

The locking device 362 has one in a blind hole in the sleeve 350 screwed in mounting pin 364. The mounting pin replaces one of the locating pins for holding the annular seal, for example the spring pin 210 according to FIG Figures 8 and 10. Its cylindrical inner end 366 engages the seal.

The locking device has a substantially U-shaped locking plate 368 with two parallel legs 370 which slide into adjacent keyways of flange 350 fit. The locking plate 368 also includes a base plate 372 with a serrated underside which, when the locking plate is locked, is inserted into the keyways of the Flange 352 engages. Figure 20 shows this position of the locking plate 368; the legs 370 of the locking plate engage in the keyways of the flange 350, and the base plate 372 engages the keyways of flange 352, thereby engaging the sleeves 358 and 360 secured against rotation against one another.

The locking plate 368 is substantially in the axial direction of the pipe connection from the locking position shown in a position shifted to the right in FIG Slidable position in which the base plate 372 disengages from the flange 352 stands, so that the two sleeves 358 and 360 can be rotated against each other. The move The locking plate is done with the help of a handle 374, which is pivotable with the mounting pin 364 is connected and has angled regions 376 on both sides thereof. Outside the angled areas, the locking plate 368 is by means of tabs 378 connected to the handle, with the tabs 378 bent over the handle are. The handle 374 also has an outer, downwardly curved portion 380, which has an extension 382 on the sleeve 360 for locking the handle in the position shown in Figures 20 and 21. To release the locking device the handle 374 is released from the extension 382 and moved in the direction of arrow 384 in FIG Figure 21 pivoted upwards. Because of the angled areas 376 this causes Movement a shift of the locking plate in Figure 20 to the right, 10 that the base plate 372 releases the flange 352 of the sleeve 360. This makes the sleeves 358 and 360 rotatable against one another in the aforementioned manner. The lock is by pressing down of handle 374 against the direction of arrow 384 and by snapping over the extension 382 can be quickly restored.

Claims (15)

Claims e pipe connection, in particular as a blind stopper, sealing cap or as a safety valve in pipes, hoses or pipe-like lines, characterized by a watertight connection to a first sleeve (168; 192 ") annular seal (164; 246) with an annular recess (178; 249) for receiving an annular extension (180; 252) of a second sleeve (166, 190 "), wherein the recess (178; 249) tapers inwardly in cross section and two at a distance lying to one another, the inner and outer circumference of the ring extension (180; 252) of the second sleeve (166; 190 ") surrounding thin, flexible and annular lips (182) forms, which are either inwardly at high or low internal pressures or to the outside against the ring extension (1 # 0; 252) of the second sleeve (166; 190 "), and by a coupling device for connecting the first sleeve (168; 192 ") with the second sleeve (166; 190 ") and for sealing the second sleeve (166; 190") with the aid of the seal (164; 246), the penetration depth depending on the sealing requirement the second sleeve (166; 190 ") into the recess (178; 249) of the seal (164; 246) is adjustable by the coupling device. 2. Pipe connection according to claim 1, characterized in that the Lips (340, 342) of the seal are integrally formed on the first sleeve (332), and that the second sleeve (334) one of the recess (344) between the lips (340, 342) corresponding ring extension (346). 3. Pipe connection according to claim 1, characterized in that the Seal (24) on the side opposite the first recess (100) has a second, likewise has inwardly tapering recess (102), the two Recesses (100 and 102) each have two lips (104, 106; 108, 110) which the ring extensions (48; 50) of the first and second sleeves (20; 22) sealingly enclose. 4. Pipe connection according to claim 1, characterized in that the Seal (164; 246) in an annular space provided in the first sleeve (168; 192 ") (176; 248) is inserted watertight. 5. Pipe connection according to claim 4, characterized in that the Seal (164; 246) lies completely in the annular space (176; 248) and that for deformation the inner and outer lips (182) in the annular space (176; 248) free spaces (254; 256) are provided. 6. Pipe connection according to claim 1, characterized in that the Coupling device a first and second by means of a multi-start thread with one another comprises screwed connecting sleeves (194 ", 196"), and that the connecting sleeves (194 "and 196") with the first and second sleeve (190 ", 192") the two sleeves (190 ", 192") are connected in a compressive manner. 7. Pipe connection according to claim 6, characterized in that the Connecting sleeves (194 ", 196") have flanges with inner end faces, and that between the flanges a locking device against mutual rotation the first and second connecting sleeve (194 ", 196") is provided. 8. Pipe connection according to claim 7, characterized in that the Locking device one in an axial bore in the flange (70) of the first connecting sleeve (26) seated spring pin (82) in the flange (72) of the second connecting sleeve (28) intervenes in a blocking manner. 9. Pipe connection according to claim 7, characterized in that the Flanges (354, 356) of the connecting sleeves (350, 352) on their circumference for keyways wear the engagement of a locking device. 10. Pipe connection according to claim 6, characterized in that the Connecting sleeves (194i 196) each have a flange (198, 200), with the inner end face (202) of the flange (200) of the second connecting sleeve (196) ratchet teeth (204) are arranged in a ring, with one on the first connecting sleeve (194) ontierten pawl (206) a release of the first and second connecting sleeve (194, 196) preventively collapse. 11. Pipe connection according to claim 1, characterized in that the first and second sleeves (166, 168) can be connected at their free ends to pipe sections are. 12. Pipe connection according to claim 11, characterized in that the first and second sleeves (166, 168) one at a time at their inner ends have externally protruding flange (170, 172), and that as a coupling device the flanges (170, 172) connecting screws (174) are provided. 13. Rohrverbind'nach claim 1 for a safety valve, characterized characterized in that the first sleeve (258) has an inlet (260) for a pressurized fluid that the second sleeve has a chamber receiving the fluid from the inlet (260) (292) forms, and that the coupling device a lifting of the second sleeve from the first sleeve (258) when a predetermined pressure is exceeded, so that pressurized fluid can escape from the chamber (292), the coupling device a spring (298) pressing the second sleeve onto the seal (264) in a sealing manner. 14. Pipe connection according to claim 11, characterized in that one the sleeves consist of two interconnected, axial and angular movements Sleeve halves (166a ', 166b', 'which are used for sealing by a bellows (185) are connected. 15. Pipe connection according to one of claims 1 to 14, characterized by a first and second in each case in annular ge recesses (100, 102) of the Seal (24) gripping sleeve (20, 22), which with the help of the sleeves (20, 22) molded shoulders (60, 62) engaging, screwed connection sleeves (26, 28) are held together.