RU121025U1 - DEVICE FOR PIPELINE SEALING WHEN REPAIRING A BALL VALVE UNDER PRESSURE - Google Patents

Abstract

A device for sealing a pipeline during the repair of a ball valve under pressure, containing a support structure, a column and a seal assembly, while the support structure includes two guiding threaded elements with nuts, a lower composite support, a middle composite support and an upper one-piece support, supports made in them axial channels are placed on guiding threaded elements with the possibility of their translational movement by means of rotation of the nuts, the column includes a hollow rod, inside which there is a one-piece screw, at the lower end of which a sealing seal and a movable stop are installed, the seal unit includes a hollow body, the cavity of which connected to a high pressure tap, characterized in that! guiding threaded elements are made in the form of studs with washers and nuts on both sides of the supports,! on the lower section of the column bar there is an internal thread, an external tapered stop and an internal groove with a sealing ring, an external thread is made in the lower part of the screw, mating with the internal thread of the bar, a sealing seal is made with internal tapered surfaces, a movable tapered stop is made with an internal groove, which is equipped with an O-ring, a transverse hole and a thread are made at the very end of the screw, onto which a nut with two washers is screwed and locked with a pin to fix the movable cone stop, a ledge and longitudinal grooves are made on the outer surface of the lower section of the rod,! the sealing unit of the rod and the upper branch pipe of the valve is made as a single unit, having a body in the form of a glass with two side o�

Description

The utility model relates to auxiliary locking means of pipelines and is intended to ensure the repair of ball valves and valves, which are under the working pressure of the medium on the main gas and oil pipelines and other pressure communications.

A device is known for sealing a pipeline when replacing a ball valve, comprising a housing attached to the valve, a hollow rod with an external thread and a locking member at its end, and a rod with a nut located inside the rod with axial movement, the nut being mounted for contact with the end face of the rod at the end of the rod opposite the locking body, while the device is equipped with a guide sleeve with an internal thread, fixed in the housing by a clamp of the axial position of the sleeve, and a disk With the element installed on the inner end of the rod, the locking element is made in the form of a collet covered by an elastic sealing ring, a hollow rod with a rod is screwed into the guide sleeve, and the disk element is installed with the possibility of contact with the inner surface of the collet sleeve, a drain hole is made in the housing, plugged with a threaded sleeve (see description of the invention for USSR copyright certificate No. 1560867, IPC F16K 43/00, publication April 30, 1990).

A disadvantage of the known device is that it is able to seal only a small pressure of the medium, since there are no elements in its design that compensate for the axial force from the pressure of the medium in the position when the device body and the replaceable valve are removed (except for the friction force of the elastic sealing ring on the inner surface of the pipeline, which is limited by permissible contact stresses and the coefficient of friction of the corresponding surfaces).

A device for changing valves at the wellhead under pressure, containing a support structure, a column and a seal assembly. The supporting structure includes two threaded guide elements in the form of screws with nuts, a lower composite support in the form of a detachable flange, an average composite support in the form of a detachable plate and an upper integral support in the form of a plate, which are placed on the guides by means of axial channels made therein threaded elements with the possibility of their translational movement by rotation of the nuts. The column includes a detachable hollow rod at the lower end with a packer containing elastic sealing elements, and the upper end of the hollow rod is bored into the central axial channel of the middle component support, a drive shaft is installed inside the hollow rod, which is detachable to change its length, components the drive shaft are interconnected by means of couplings, the lower end of the drive shaft is connected to the drive roller of the packer, and a rotation disk is fixed to the upper end of the drive shaft, the last top component of the drive shaft is formed as a screw comprising a thrust shoulder, supported by a thrust bearing on the composite support medium in the direction of the packer. The sealing assembly includes a hollow body with a mounting flange corresponding to the valve flange, an annular elastic sealing element covering the hollow rod on its outer surface, a packing follower and a threaded pressure cap for compressing the annular elastic sealing element, while the hollow body is connected in series with each other high-pressure valves and pressure gauge (see the description of the invention for the USSR copyright certificate No. 1756533, MKP E21B 33/03, publication 23.08.1992).

The disadvantages of this known device are:

- the inability to repair welded ball valves on the gas sampling pipes of the main gas pipelines, since the mount to the fountain fittings does not allow the device to be mounted on the nozzle to the tap, and the hollow stem seal assembly does not allow sealing of the known device on the nozzle after the tap;

- the use of the design of the packer with axial compression of plane-cylindrical elastic elements does not provide reliable sealing of the passage channel of the crane, since the radial deformation of the elastic elements is less than the initial clearance between these elements and the channel, taken into account the passage of the packer through the internal "reinforcement" of the weld seams of the crane being repaired to appropriate branch pipes;

- it is impossible to dismantle the lower seat of the ball valve being repaired, since there is no necessary clearance for the extractor to pass between the column and the inner surface of the seat.

The objective of the claimed utility model is to create a rational design of a device for repairing welded ball valves (gate valves) under pressure, in which due to the fact that the device is equipped with guide pins, a single seal assembly, a lower detachable support with stops and adjusting half rings, a sealing seal with internal conical surfaces and their corresponding expanding conical stops, as well as a ledge and grooves on the outer surface of the lower part of the column rod, it is possible the ability to use the device on the gas sampling pipes of the main gas pipelines.

The essence of the claimed utility model is as follows.

A device for sealing a pipeline during the repair of a ball valve under pressure, comprising a support structure, a column and a seal assembly, the support structure including two threaded guide elements with nuts, a lower composite support, a middle composite support and an upper integral support, supports made in of them axial channels are placed on the threaded guide elements with the possibility of their translational movement by rotation of nuts, the column includes a hollow rod, inside which is placed one-piece screw, at the lower end of which there is a sealing seal and a movable stop, the seal assembly includes a hollow body, the cavity of which is connected to a high-pressure valve, characterized in that:

guide threaded elements are made in the form of studs with washers and nuts on both sides of the supports;

on the lower section of the hollow rod, an internal thread is made, an external conical stop and an internal groove into which the sealing ring is installed, an external thread is made in the lower part of the solid screw, mating with the internal thread of the rod, the sealing seal is made of elastic material with an external cylindrical and internal conical surfaces, a movable conical emphasis is made with an internal groove in which the sealing ring is installed, a transverse hole and a thread are made at the very end of the screw, onto which a nut with two washers is screwed and locked with a pin to fix the movable conical stop, on the outer surface of the lower section of the rod there is a ledge to stop the middle support after disassembling the crane being repaired and longitudinal grooves for accommodating the extractors of the lower saddle of the ball valve being repaired; the seal assembly of the rod and the upper nozzle of the crane is made unified, having a body in the form of a cup with two side holes, two nozzles are welded coaxially, on one of which a high pressure valve is installed on the tapered thread, and a plug is installed on the other on the tapered thread the glass on both sides has bores of different diameters, in the middle of which grooves are made and o-rings are placed in them;

the lower support consists of four bolts fastened together with washers and nuts of the base and the lining, on top of which four stops with cylindrical heads are mounted on the thread, while adjusting half rings are mounted on the screws inside the central hole of the base and lining.

This allows for safe repair of the welded ball valve installed on the gas sampling pipe of the existing main gas pipeline, which is under working pressure and does not stop gas transportation.

The essence of the claimed utility model is illustrated by drawings, where

figure 1 shows a device for sealing a pipeline during the repair of a ball valve under pressure, an assembly drawing with a longitudinal section;

figure 2 is also a column, an assembly drawing with a longitudinal section;

figure 3 - also, a single node seal, assembly drawing with a longitudinal section;

figure 4 - also, the lower support, assembly drawing, top view.

A device for sealing a pipeline during the repair of a ball valve under pressure contains a supporting structure 1, a column 2 and a single unit 3 of the seal.

The supporting structure 1 includes two threaded guide elements in the form of studs 4 with washers 5 and nuts 6, a lower composite support 7, an average composite support 8 in the form of two identical parts, which are interconnected by two bolts 9 with washers 10 and nuts 11, and the upper one-piece support 12, while the supports 7, 8 and 12 by means of axial channels made therein are placed on the studs 4 with the possibility of their translational movement by rotation of the nuts 6.

Column 2 includes a single hollow rod 13, on the lower portion of which there is an internal thread 14, an external conical stop 15 and an internal groove 16 into which the rubber ring 17 is mounted. A hollow screw 18 is installed in the hollow rod 13, on the lower portion of which the outer a thread 19 for interacting with the internal thread 14 of the rod 13. At the lower end of the screw 18 there is a sealing seal 20, a movable conical stop 21 and two washers 22. In this case, the stop 21 is made with an internal groove 23 into which the rubber ring 24 is mounted. at the lower end of the screw 18 there is a transverse hole 25 and a thread 26 on which a nut 27 is screwed, locked with a pin 28, for fixing the movable conical stop 21. On the outer surface of the lower portion of the hollow rod 13, longitudinal grooves 29 are made for receiving extractors (not shown in the drawing ) the lower saddle of the repaired ball valve and collar 59 for stop of the middle support 8 when removing from the column and replacing parts of the repaired crane 57.

A single seal assembly includes a hollow body in the form of a cup 30, the cavity of which is connected to a high pressure valve 31. The glass 30 is made with two side holes 32, two pipes 33 are welded coaxially, on one of which a high-pressure valve 31 is installed on the tapered thread, and on the other on the tapered thread is a plug 34. The glass 30 has bores 35 on both sides and 36 of different diameters, in the middle of which grooves 37 and 38 are made and O-rings 39 and 40 are placed in them.

The lower support 7 includes a base 41 and a cover 42, which are fastened to each other by four bolts 43 with washers 44 and nuts 45. Four stops 46 with cylindrical heads 47 are mounted on the thread on the base and cover on top of the thread. At the same time, inside the central hole of the base 41 and pads 42 mounted adjusting half rings 48, secured with screws 49 with countersunk head.

To fix the hollow rod 13 from turning together with the screw 18, two grooves 50 are made at its upper end, in which crackers 51 are placed, which are welded to the support part 52 of the upper support 12. At the same time, the thread 53 is screwed onto the upper part of the screw 18 nut 54. At the upper end of the screw 18, a turn-key cut 55 is made.

A device for sealing the pipeline during the repair of a ball valve under pressure works as follows.

The upper part of the gas sampling pipe 56 (hereinafter the upper pipe) above the faulty ball valve 57 is cut in a sparkless manner (with a hacksaw or a pipe cutter) to the required length. The upper end of the pipe is processed inside and out to allow the sealing seal 20 of the column 2 to pass through the possible internal reinforcement of the weld and correspond to the bore 36 of the cup 30 of the single seal assembly 3. On the cleaned section of the gas sampling pipe 58 below the faulty ball valve 57 is installed lower composite support 7 s the placement of the cylindrical heads 47 of the stops 46 in the groove of the lower half-housing of the ball valve 57. The base 41 and the pad 42 with the adjusting racks pre-installed in them with flanges 48 (to match the outer diameter of the nozzle 58) are connected by bolts 43 with washers 44 and nuts 45. In the holes of the base 41 are installed studs 4 of the required length with washers 5 and nuts 6. Inside the upper nozzle 56, the column 2 is installed until it stops in a ball closed ball valve of the crane being repaired. On top of column 2 and pipe 56, a single seal assembly 3 is installed until the end of the bore 36 of the cup 30 stops at the end of the upper pipe 56. In this case, in the absence of leakage through the ball valve of the valve being repaired, the valve 31 can be closed; if there is a leak, the valve must be is open. On top of the column 2 and the studs 4, two parts of the middle composite support 8 are installed and connected by bolts 9 with the washers 10 and nuts 11, which are pressed against the stop in the bottom of the cup 30 of the single seal assembly 3 and are controlled by the rotation of the nuts 6 with the washers 5. On the studs 4 and the screw 18 protruding from the rod 13 of the column 2 is installed upper support 12 with the placement of its crackers 51 in the grooves 50 of the rod 13 and is slightly pressed down with stud nuts 6 with washers 5. The ball valve of the valve 57 being repaired opens and the upper nuts 6 are uniformly rotated above the upper support 8 col and 2 moves downward by the value of its working stroke, at which the sealing seal 20 of the column 2 is installed at the level of the bore of the nozzle of the lower half-housing of the crane being repaired 57. In this position of the column 2, when the screw 18 is rotated counter-clockwise by the edge 55 of the screw 18, the repair ball valve 57 by compressing the sealing seal 20 between the conical stop 15, the movable conical stop 21 and the inner wall of the pipe of the lower floor of the valve body 57. To relieve pressure in the cavity above by the deduction of 20 and checking the degree of sealing, the tap 31 of the single seal assembly 3 opens. If the outflow of gas from the tap 31 occurs, the screw 18 is turned until the outflow of gas from the open tap 31 is stopped. In this position, the nuts that tighten the half-bodies of the crane 57 being repaired and the stud nuts 6 above the middle support 8 are unscrewed, the nuts 11 with washers 10 are also unscrewed and removed connecting both parts of the middle support, which are removed from the studs 4 of the supporting structure 1. After that, it moves up the rod 13 and the cup 30 is removed from the upper nozzle 56, then the upper half-body moves up the rod with the seal nym seat, a special seal ring, ball plug and the spindle with the repaired tap sleeve 57. All the raised parts are raised to stop the upper support 12 and secured thereto by means of binding wire or chain from the hook. Using the extractor hooks located in the longitudinal grooves 29 on the outer surface of the lower part of the rod 13 of the column 2, a sealing seat with springs is removed from the lower half-housing of the crane 57 being repaired. After that, the middle support 8 is again installed in the lower position with the stop in the collar 59 of the column 2, it is pressed against it and locked with stud nuts 6 with washers 5. Then, stud nuts 6 with washers 5 are unscrewed and removed over the upper support 12, which is removed from the screw 18 of the column 2 and the studs 4. Then a single unit 3 of the seal is removed nii, upper half-housing with seat, special o-ring, ball plug, spindle with sleeve and lower seat of the crane being repaired 57.

After cleaning, inspection and, if necessary, replacement, the nodes and parts of the ball valve are installed on the column on top of the middle support 8 in the reverse order. Then, a single assembly 3 of the seal and the upper support 12 are installed, which is pressed against the upper end of the rod 13 by nuts 6 with washers 5. After that, the nodes and parts of the ball valve together with the assembly 3 of the seal are lifted above the middle support 8, which is removed from the lower position when it is rests against the shoulder 59. The nodes and parts of the ball valve being repaired are installed in the working position, the half-shells of which are pulled together by standard studs and nuts. A single seal assembly 3 is installed on top with an emphasis on the end face of the upper pipe 56 and then the middle support 8 is in its upper position, pressing it against the glass 30 with nuts 6 and washers 5. By rotating the screw 18 clockwise, the movable stop 21 is retracted from the fixed stop 15, which seals the seal 20 is released and due to the elastic properties takes its initial position. A nut 54 is screwed onto the screw 18 of the column. When unscrewing the nuts 6 over the upper support 12 under the action of gas pressure in the gas outlet pipe, the column 2 with the seal 20 moves up and is placed above the ball valve. Then the repaired ball valve 57 is closed. At low pressure in the gas outlet, the column 2 moves upward by uniform rotation of the nuts 6 installed under the upper support 12. The sealing and depressurization processes (seal operation 20) are monitored, as well as pressure relief at various stages by opening the valve 31 of a single seal assembly 3.

The device is dismantled from the gas sampling pipe of the existing main gas pipeline after pressure relief when the valve 31 is opened, and there is no further expiration thereof, and also after checking the tightness of the repaired ball valve against the valve, connector and spindle.

The claimed utility model allows for the safe repair of a welded ball valve installed on the gas sampling pipe of an existing gas pipeline under operating pressure and not stopping gas transportation.

Claims (1)

A pipeline sealing device for repairing a ball valve under pressure, comprising a support structure, a column and a seal assembly, wherein the support structure includes two threaded guide elements with nuts, a lower composite support, a middle composite support and an upper integral support, supports made in them axial channels are placed on the threaded guide elements with the possibility of their translational movement by rotation of the nuts, the column includes a hollow rod, inside of which is placed th screw, at the lower end of which there is a sealing seal and a movable stop, the seal assembly includes a hollow body, the cavity of which is connected to a high pressure valve, characterized in that guide threaded elements are made in the form of studs with washers and nuts on both sides of the supports, on the lower section of the column rod, an internal thread is made, an external conical stop and an internal groove with a sealing ring, an external thread is made in the bottom of the screw, mating with the internal thread of the rod, a sealing seal is made with internal conical surfaces, a movable conical stop is made with an internal groove, in which has a sealing ring, at the very end of the screw there is a transverse hole and a thread on which a nut with two washers is screwed on and locked with a pin for fixing and a movable conical stop, on the outer surface of the lower section of the rod is made ledge and longitudinal grooves, the seal assembly of the rod and the upper nozzle of the crane is made unified, having a body in the form of a cup with two side holes, two nozzles are welded coaxially, on one of which a high pressure valve is installed on the tapered thread, and a plug is installed on the other on the tapered thread the glass on both sides has bores of different diameters, in the middle of which grooves are made, and o-rings are placed in them, the lower support consists of four bolts fastened together with washers and nuts of the base and the lining, on top of which four stops with cylindrical heads are mounted on the thread, while adjusting half rings are installed on the screws inside the central hole of the base and lining.