Parker-anchor

FIELD: oil-and-gas industry.

SUBSTANCE: well parker-anchor, containing a case, an anchor unit, consisting of a void cone and a ram, installed under a sealing element, located between a top fixed stop block and a bottom stop block, and a drive, made as a piston with pass through channel, equipped with pass though narrowing on the bottom, and from the top - with a void bar, which stiffly and axially connected with the cone from the top, stiffly fixed with the case. The piston installed inside of the movable cylinder, and the inside void between the cylinder and the piston connected with the bar void over the pistons pass through channel narrowing, at that the top stop block executed spring loader from the top and with ability of limited upwards movements, and the bottom stop block equipped with radial windows and is movable, has upwards movement ability, interaction with the cylinder at the bottom. Rams made roller shaped with longitude holes, installed in the bottom stop block windows on axis, which fixed perpendicularly to the case axis, at that the rollers longitude hole diametre is bigger then axis external diametre, and the rollers external surface serially interacts with the void bar external surfaces, the cone, the case and the wells wall during the bottom stop block movement relatively to the case. In the offered parker-roller design, which roles between the well wall and the case, achieves a reliable borehole separation in result to the tubing string weight, because of that parkering and unparkering executed with tubing string movement, which location controlled on the borehole head.

EFFECT: design simplification, operational reliability increase, manufacturing and maintenance works cast cutting due to simple and processible spare part use, their quantity decrease.

7 dwg

 

The invention relates to techniques for servicing and wells, namely, devices to divide the annular space in the processing of bottom-hole zone, hydraulic fracturing and other works.

Known packer-anchor (RF patent No. 2179228, IPC EV 33/12, publ. bull. No. 4, 10.02.2002, containing sub, upper stem with upper and lower radial protrusions, the lower stem with a groove, rigidly interconnected, the upper body with spring-loaded dice, split cone with internal radial sampling, the sealing element is placed above the sealing element, the focus and the casing positioned below the sealing element of the cone, the lower housing with spring-loaded dice and straps, retainer, differential shaft, rigidly connected with the upper and lower rods, differential bushing rigidly connected to the casing and emphasis of the sealing element, when this differential bushing set free on the differential the rod can be locked down-gearing it with a differential piston rod and cone split spring-loaded relative to the differential bushings.

The disadvantage of packer-anchor is the design complexity and low reliability, because there is no certainty translation release from transport position to working condition by rotation of the weight of the tool is even with spring bars. There is a possibility not to zapchelovtsa, i.e. there is no confidence in the reliability of operation of the packer-anchor.

Closest to the proposed by most matching features for a packer-anchor (RF patent No. 2301321, IPC EV 33/1295 publ. bull. No. 17, 20.06.2007,), comprising a housing, an anchor node, consisting of a cone and dice placed under sealing element, which is located between the upper movable stop and the lower stop, and the drive is made in the form of a piston with a through channel that is installed inside the cylinder with the possibility of a limited longitudinal movement.

The disadvantages of this packer-anchor are low reliability due to the presence in its design, the rack, the transmitting axial force on the movable stop and the further sealing element. Thus the toothed rack is spring-loaded in a radial direction, and this gear connection is not protected from zellamsee impurities contained in the well fluid, which can lead to respitrace after sectioning of the pin and the fall of the sleeve with the ball resting on the bottom of nescaline rack with gear rings on the body. Significant axial load on the rack may cause deformation or breakage, which will prevent actuation of the packer. Breakage or zasilanie springs can cause failure of the packer due to the azepine rack with gear rings on the body. A significant drawback of safe operation packer-anchor is that the force of engagement of the lower stop for the wall of the bore through the sealing element, which will take part arching axial load on the cone itself after contact with the hole wall, reducing the force to the valve stem dice on the borehole wall. Reduced force to the valve stem dice against the wall of the borehole may cause movement of the anchor-packer in the borehole wall. Discharged on the bottom ball with Bush it is undesirable to leave in the well. The complexity of the design due to the large number of original parts reduces the reliability of the actuation of the packer-anchor and increases the cost of manufacture and operation. The design of the packer-anchor is not applicable in horizontal wells, where possible lack of a tight landing the ball to cut off the sleeve.

The technical task is the extension of application due to the possibility of use in horizontal, inclined and highly deviated wells. Improving the reliability and usability of the application of simple designs small number of parts. Getting reduce time and energy on the production packer-anchor the use of technology in the manufacture of parts.

The technical problem is solved packer-anchor for SK is Agin, comprising a housing, an anchor node, consisting of a hollow cone and plates, placed under the sealing element, which is located between the upper movable stop and the lower stop, and the drive is made in the form of a piston with a through channel that is installed inside the cylinder with the possibility of a limited longitudinal movement.

What's new is that the piston is equipped at its bottom by a narrowing of the flow channel, and the top of the hollow rod, which top is rigidly and coaxially connected to the cone, fixed top coaxially with the casing, and the cylinder is made movable and is installed outside of the piston and an inner cavity between the cylinder and the piston is communicated with the cavity of the rod above the narrowing of the flow channel of the piston, the upper stop is made the spring loaded top and with a limited move up, the lower stop is provided with radial Windows and made movable so that they can move up and interact in the bottom with the cylinder and the die is made in the form of rollers with longitudinal holes, installed in the Windows of the lower emphasis on the axes, which are fixed in the Windows perpendicular to the body axis, with the inner diameter of the longitudinal hole of the roller is greater outer diameter axis and the outer surface of the roller successively interacts with the outer surfaces of the hollow rod, cone, body, and article is ncoi well when moving the lower extreme position relative to the body.

Figure 1 shows the packer is anchored in the transport position with a partial longitudinal section; figure 2 - cross section a-a figure 1, figure 3 - packer-anchor in the position prescribed by the pressure of the pumped fluid, with a partial longitudinal section, figure 4 - packer-anchor with partial longitudinal section, when the rollers are brought into the working position, figure 5 - packer-anchor with partial longitudinal section in position, ready for the downhole separation space, 6 - packer-anchor with partial longitudinal section in the working position, 7 - section b-B 6.

Packer-anchor for wells contains a stepped block 1 (figure 1) with a Central straight-through channel 2, provided with a thread 3 for connection with the column pipe (not shown)consisting of a hollow cone 4, the rod 5, the piston 6 with the upper ledge 7, the lower ledge 8 (figure 3) and the narrowing of 9. Dies are made in the form of rollers 10 located in the radial boxes 11 (1) lower the movable support 12 on the axis 13 perpendicular to the axis of the housing 1, with the inner diameter 14 (2) of the rollers 10 is larger than the diameter of the axis 13 on the magnitude of the radial stroke of the rollers 10 in their interaction with the cone 4 (figure 1). Between the lower movable pillar 12 and the upper movable support 15 posted sealing element 16, with the upper movable bearing 15 has the opportunity to move up, limited by the protrusion 17 of the housing 1, and under the of ruinen spring 18 down which rests on the ledge 19 of the housing 1. Outside of the piston 6 has a cylinder 20 with projections 21 (figure 3) and 22 limiting the movement of the cylinder 20 up and down. The movement of cylinder 20 (Fig 1) is provided by the differential pressure created by the narrowing of 9 flow channel 2 between the internal cavity 23 formed by the piston 6 and the cylinder 20, and the bore 24. The inner cavity 23 is communicated with a through channel 2 hole 25 of the rod 5 located above the constriction 9 of the piston 6.

Packer-anchor for wells works as follows.

The installation process packer-anchor consists conventionally of the five stages.

1st step - down packer-anchor into the borehole 24, (Fig 1);

2nd stage - preparation of packer-anchor for the installation of the pressure of the pumped fluid, (3);

3rd stage - the output rollers in operating position, (figure 4);

4th stage - preparation of the sealing element to the downhole separation space (figure 5);

5-phase - separation downhole space (6).

The 1st stage. Pipes (not shown), connected by a thread 3 (1) packer-anchor, lowered into the well area 24, where it is necessary to produce uncoupling the annular space to the bottomhole zone treatment, hydraulic fracturing or other works. During lowering of the packer-anchor under the action of a spring 18, rests on the ledge 19, the upper movable bearing 15 is located on the lower housing 1 is of the protrusion 17. The sealing element 16 is located on the body 1 and partly on the cone 4 and the lower movable bearing 12 with rollers 10 is located on the rod 5. The cylinder 20 is in the lower part of the rod 5 and the piston 6, and the protrusion 22 (3) of the cylinder 20 communicates with the tab 8 of the piston 6 (Fig 1).

The 2nd stage. Pumping fluid through the Central channel 2 of the housing 1 and through the piston 6, having a constriction 9, through holes 25 creates a differential pressure between the piston cavity 23 and bore 24. Under the action of the differential pressure cylinder 20 (2) moves up the bottom support 12 with the rollers 10, the sealing element 16, the upper support 15, compressing the spring 18, while the radial movement of the rollers 10 is limited by their interaction with the cone 4 to dense with tightness of contact between the rollers 10 with the hole wall 24 due to the difference of the inner diameter of 14 (7) of the opening roller 10 and the diameter of the axis 13.

The 3rd stage. Upon further descent of the column of pipes (not shown) is rolling rollers 10 (figure 4) up to the body 1 relative to its and down relative to the borehole walls 24. As the speed of descent of the column of pipes (not shown) in the well 24 more speed of movement of the rollers 10 with the lower support 12, there is a further movement of the upper support 15, the sealing element 16 with simultaneous compression of the spring 18. At this stage, the movement of the cylinder 20 is recrushed when the stop projection 21 (Fig 3) in the protrusion 7 of the piston 6.

4-th stage. Continuing to pull the string of pipe (not shown), is further movement of the lower support 12 (figure 5) with rollers 10 upwards relative to the housing 1, that is, all rows of rollers 10 are in contact tightly with the wall of bore 24 and the housing 1, and the upper bearing 15 (Fig 1) hits the stop 17 of the housing 1, ceasing further compression of the spring 18.

The 5th stage. At this stage completes the process of installing the packer-anchor further descent of the column of pipes (not shown), which are forced to roll the rollers 10 (6) on the housing 1 and the borehole wall 24, compressing the lower support 12 of the sealing element 16, which, increasing in cross-section, is pressed against the borehole wall 24, rasamma annular space.

On completion of the works using packer-anchor is necessary to pull up the string of pipe (not shown), which will force you to roll the rollers 10 on the body 1 and the borehole wall 24. As the speed of lifting the pipe string (not shown) in the well is greater than the speed of movement of the rollers 10 with the lower support 12, moves the lower support 12 and the restoration of the sealing element 16, with the upper bearing 15 and the compressed spring 18 is moved from the housing 1. Further lifting of pipes (not shown) forces you to roll the rollers 10 on the walls of the bore 24, the housing 1, and then the cone 4 (figure 2), thus moving the lower the pores 12, the sealing element 16, the upper support 15 and radiatia spring 18. The rolling of the rollers 10 and the walls of the bore 24, the housing 1, and then the cone 4 will continue until such time as the roller 10 due to the radial movement due to prokachivanija the cone 4 and by the difference in diameter of the axis 13 and the internal diameter of 14 will not cease to interact with the borehole wall 24. In the future, under the action of a spring 18 (Fig 1) moves the upper support 15, the sealing element 16, the lower support 12 with rollers 10 and the cylinder 20 in the ready state to the rise or move to another location in the well where it is necessary to make the separation of the annular space to the bottomhole zone treatment, hydraulic fracturing or other works.

In the proposed design of the packer-anchor roller, rolling between the borehole wall and the casing, due to the weight of the column of pipes is achieved reliable downhole separation space, as Petrovka and raspaculo are made by moving the pipe string, the position of which is controlled at the wellhead.

Such design of the packer-anchor to divide the annular space in the processing of bottom-hole zone, hydraulic fracturing or other works provides simplify design, increase reliability, reduce the financial cost of the of and service use simple designs, technology in the manufacture of parts, and reduce their number.

Packer-anchor for wells, comprising a housing, an anchor node, consisting of a hollow cone and plates, placed under the sealing element, which is located between the upper movable stop and the lower stop, and the drive is made in the form of a piston with a through channel that is installed inside the cylinder with the possibility of a limited longitudinal movement, characterized in that the piston is equipped at its bottom by a narrowing of the flow channel, and the top is a hollow rod, which top is rigidly and coaxially connected to the cone, fixed top coaxially with the casing, and the cylinder is made movable and is installed outside of the piston and an inner cavity between the cylinder and the piston is in communication with the cavity of the rod above the narrowing of the flow channel of the piston, the upper stop is made the spring loaded top and with a limited move up and lower stop is provided with radial Windows and made movable so that they can move up and interact in the bottom with the cylinder and the die is made in the form of rollers with longitudinal holes installed in the Windows of the lower emphasis on the axes, which are fixed in the Windows perpendicular to the body axis, with the inner diameter of the longitudinal hole of the roller is greater outer diameter axis and the outer surface R of the face consistently interacts with the outer surfaces of the hollow rod, cone casing and the well wall when moving the lower extreme position relative to the housing.



 

Same patents:

Parker // 2379470

FIELD: oil-and-gas industry.

SUBSTANCE: parker contains a channel with sealing element, executed as a set of sleeves, and a hydraulic anchor, including a ram holder, rams and a cone, and an electrical cable, at that the hydraulic anchor has a case-piston, connected to the channel and creating a piston void together with creping its over the ram holder, connected through the channel wall hole with the channel external void, hydraulic anchor case-piston and the parker case connected with nipples over the sealing elements, inside the case-piston channel located a sickle shaped tube adjusting to its external surface, connected to the nipples inclined holes, the electrical cable goes throughout the sickle shaped tube, which cores enters the nipples inclined holes and connected to located on the nipples inclined holes ends cable connectors, with its help cable cores going through the sickle shaped tube connected to extension cables, at that the nipple connected to the channel, connected with tubing string, with the aid of which the parker installed inside the borehole with ability to of tubing string supply through nipples, the parkers channel and the hydraulic anchor case-piston medium produced form the well, at that nipples ends inclined holes and the sickle shaped tube ends mutual dislocation in one plane created because of the nipple position fixing relatively to the parkers channel and the hydraulic anchor case-piston, correspondingly with a help of a retainer nut, screwed on the parkers channel, which rotation relatively to the parkers channel limited with a stop screw, and nipples connected to the channel with captive nuts, screwed on the nipple screw till it external end meets retainer nuts.

EFFECT: parker operation reliability increase.

4 cl, 1 dwg

Drillable packer // 2344270

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas production industry and is intended for overlapping of intertubular space and performance of isolating works in case of wells overhaul. Drillable packer contains shaft with notches on external surface, the following components installed on shaft - combined sealing element, extrusion washers, upper and lower rupture screw-thread dies, movable upper and fixed lower supports, fixator in the form of split spring rings in annular bore of movable support. Packer shaft is equipped by left sub with calibrated annular bore and nipple in axial channel, which is rigidly connected to left sub and equipped with fitting valve in axial channel in the form of sleeve with dead bottom and radial holes covered with bushing equipped with throttle. Bushing is connected to sleeve by calibrated shear element. Bottom support is equipped with spring-loaded check valve in the form of body with plug in middle part and radial holes, elastic sealing collar at the lower end, installed with the possibility of interaction with seat in axial channel of lower support.

EFFECT: increase of intertubular space sealing reliability, and also increase of fitting tool functional resources by its multiple usage.

3 cl, 4 dwg

Anchor packer // 2301321

FIELD: underground well repair, particularly equipment for sealing or packing boreholes or wells, namely devices for annulus separation during bottomhole zone waterproofing, hydraulic reservoir fracturing and other operations to be executed in well.

SUBSTANCE: device comprises body, anchoring unit including cone and slips, sealing member, upper and lower movable and lower fixed stops and drive. Anchoring unit is arranged on the body under sealing member. Drive is made as piston installed inside the body and provided with levers and pressing members made as racks. The racks may move in axial and radial directions. Toothed rings mating the racks are formed on outer surface of the body. Inner body surface is provided with extension to limit piston stroke. Upper body part has shear bush for drop ball receiving. Anchoring unit is located over fixed support. Slides have inclined teeth. Upper parts of the teeth are directed opposite to lower parts thereof.

EFFECT: increased efficiency.

2 dwg

The invention relates to the field of well operation and can be used to provide pumping of fluid pumped by submersible pump in the well casing string

The invention relates to the oil and gas industry, namely to the packers for a step of cementing the casing, in particular technical columns, the overlapping zone of absorption of cement slurry

Anchor packer // 2301321

FIELD: underground well repair, particularly equipment for sealing or packing boreholes or wells, namely devices for annulus separation during bottomhole zone waterproofing, hydraulic reservoir fracturing and other operations to be executed in well.

SUBSTANCE: device comprises body, anchoring unit including cone and slips, sealing member, upper and lower movable and lower fixed stops and drive. Anchoring unit is arranged on the body under sealing member. Drive is made as piston installed inside the body and provided with levers and pressing members made as racks. The racks may move in axial and radial directions. Toothed rings mating the racks are formed on outer surface of the body. Inner body surface is provided with extension to limit piston stroke. Upper body part has shear bush for drop ball receiving. Anchoring unit is located over fixed support. Slides have inclined teeth. Upper parts of the teeth are directed opposite to lower parts thereof.

EFFECT: increased efficiency.

2 dwg

Drillable packer // 2344270

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas production industry and is intended for overlapping of intertubular space and performance of isolating works in case of wells overhaul. Drillable packer contains shaft with notches on external surface, the following components installed on shaft - combined sealing element, extrusion washers, upper and lower rupture screw-thread dies, movable upper and fixed lower supports, fixator in the form of split spring rings in annular bore of movable support. Packer shaft is equipped by left sub with calibrated annular bore and nipple in axial channel, which is rigidly connected to left sub and equipped with fitting valve in axial channel in the form of sleeve with dead bottom and radial holes covered with bushing equipped with throttle. Bushing is connected to sleeve by calibrated shear element. Bottom support is equipped with spring-loaded check valve in the form of body with plug in middle part and radial holes, elastic sealing collar at the lower end, installed with the possibility of interaction with seat in axial channel of lower support.

EFFECT: increase of intertubular space sealing reliability, and also increase of fitting tool functional resources by its multiple usage.

3 cl, 4 dwg

Parker // 2379470

FIELD: oil-and-gas industry.

SUBSTANCE: parker contains a channel with sealing element, executed as a set of sleeves, and a hydraulic anchor, including a ram holder, rams and a cone, and an electrical cable, at that the hydraulic anchor has a case-piston, connected to the channel and creating a piston void together with creping its over the ram holder, connected through the channel wall hole with the channel external void, hydraulic anchor case-piston and the parker case connected with nipples over the sealing elements, inside the case-piston channel located a sickle shaped tube adjusting to its external surface, connected to the nipples inclined holes, the electrical cable goes throughout the sickle shaped tube, which cores enters the nipples inclined holes and connected to located on the nipples inclined holes ends cable connectors, with its help cable cores going through the sickle shaped tube connected to extension cables, at that the nipple connected to the channel, connected with tubing string, with the aid of which the parker installed inside the borehole with ability to of tubing string supply through nipples, the parkers channel and the hydraulic anchor case-piston medium produced form the well, at that nipples ends inclined holes and the sickle shaped tube ends mutual dislocation in one plane created because of the nipple position fixing relatively to the parkers channel and the hydraulic anchor case-piston, correspondingly with a help of a retainer nut, screwed on the parkers channel, which rotation relatively to the parkers channel limited with a stop screw, and nipples connected to the channel with captive nuts, screwed on the nipple screw till it external end meets retainer nuts.

EFFECT: parker operation reliability increase.

4 cl, 1 dwg

Parker-anchor // 2379471

FIELD: oil-and-gas industry.

SUBSTANCE: well parker-anchor, containing a case, an anchor unit, consisting of a void cone and a ram, installed under a sealing element, located between a top fixed stop block and a bottom stop block, and a drive, made as a piston with pass through channel, equipped with pass though narrowing on the bottom, and from the top - with a void bar, which stiffly and axially connected with the cone from the top, stiffly fixed with the case. The piston installed inside of the movable cylinder, and the inside void between the cylinder and the piston connected with the bar void over the pistons pass through channel narrowing, at that the top stop block executed spring loader from the top and with ability of limited upwards movements, and the bottom stop block equipped with radial windows and is movable, has upwards movement ability, interaction with the cylinder at the bottom. Rams made roller shaped with longitude holes, installed in the bottom stop block windows on axis, which fixed perpendicularly to the case axis, at that the rollers longitude hole diametre is bigger then axis external diametre, and the rollers external surface serially interacts with the void bar external surfaces, the cone, the case and the wells wall during the bottom stop block movement relatively to the case. In the offered parker-roller design, which roles between the well wall and the case, achieves a reliable borehole separation in result to the tubing string weight, because of that parkering and unparkering executed with tubing string movement, which location controlled on the borehole head.

EFFECT: design simplification, operational reliability increase, manufacturing and maintenance works cast cutting due to simple and processible spare part use, their quantity decrease.

7 dwg

FIELD: oil and gas production.

SUBSTANCE: packer-anchor consists of housing, anchor unit made of cone and slips in a form of rollers, sealing element between the upper and lower movable supports, drive. The upper support is spring-loaded downwards by coil spring that leans on the lower bushing of protective means against foreign substances that includes upper and lower movable bushings loaded by the said spring and collar fixed between these bushings capable of radial extension. The effort necessary for maximum radial extension of the collar is less than the effort necessary for rollers movement on the cone. The possibility of upper support axial movement is limited by end surface of housing step. Method of well annular space separation consists in descending of described packer-anchor into the well, preparation of packer-anchor to installation by pressure of pumped fluid, setting of rollers into working position, preparation of sealing element for separation of well space, separation of well space with the possibility of further de-packering-de-anchoring, removing from well or movement to well other zone.

EFFECT: increase of device and method of space separation reliability, facilitation of operational service.

2 cl, 7 dwg

Packer // 2459928

FIELD: oil and gas production.

SUBSTANCE: packer includes hollow shaft, sealing elements with stops mounted on the shaft, anchor unit that consists of casing with cone with slots and plates installed in them, connected to hydraulic cylinder piston via rods, the cavity of the cylinder is connected to the cavity of the shaft through radial channel and extension-type connection pipe mounted at the lower end of hollow plunger. Note that the piston is spring-loaded downwards in relation to the cylinder - to transport position and the rods are assembled consisting of upper, pin-connected to the plates, and lower, spherically-connected to the piston, parts that are interconnected via threaded connection adjusting the rod length. Sealing elements on outer surface contacting the stops can be equipped with facets, the quantity of sealing elements can exceed two and additional intermediate stops can be arranged between them, under the sealing elements there can be installed a driving washer rigidly connected to the corresponding intermediate support.

EFFECT: extension of packer functional capabilities for operation in slope-directed and horizontal areas of the wells, increase of packer reliability, simplification of packer assembly.

5 cl, 2 dwg

Drillable packer // 2483192

FIELD: oil and gas industry.

SUBSTANCE: drillable packer includes a shaft with a notch on outside surface, a sealing element, upper and lower disruptive rams, with upper and lower cones, a movable upper support and a fixed lower support, a fastener in the form of split spring rings in an annular bore of the movable support, a nipple in an axial channel of the shaft, which is connected through the left adapter to a hollow plunger of a hydraulic setting device, a fixed support with a spring-loaded shoe valve in the form of a housing with radial holes and a sealing cup installed on the seat. The nipple is equipped with a pusher, with an annular bore at a connection point, in the axial channel of which there installed is a piston with a bar and a sleeve, which is equipped with radial holes and rigidly attached to the pusher. The shoe valve is equipped with a seat, at the connection point of the housing of the shoe valve with the nut equipped with a shell resting on the spring, in the axial channel of which there is a seat on the internal annular projection and a spring-loaded ball valve is installed. A sleeve is equipped with longitudinal slots on the end and passed through the axial channel of the seata to the axial channel of the shoe valve with possibility of the end interaction with the spring-loaded ball valve. The bar is passed through an axial channel of the sleeve so that it goes beyond its end and forms together with it an annular gap hydraulically attaching the cavity of the packer to the axial channel of the pusher.

EFFECT: avoiding conditions of occurrence of a hydraulic impact.

4 dwg

Anchor for tubing // 2634316

FIELD: construction.

SUBSTANCE: invention relates to devices for fixing a tubing string in a casing string and eliminating the undulatory bending of the tubing string during the production of a reservoir fluid by downhole rod pumping units. The anchor consists of a housing, a cone, dies mounted on the cone by means of a dovetail, a casing, shear pins. On the cone along the dovetail, grooves are made, in which rollers installed in a cage are movable arranged, the dies resting on the rollers with their base. The cone is fixed against movement relative to the housing by means of a collet or a spring split ring. The collet or the spring split ring with its lower end rests against a ring mounted on the shoulder of the lower housing, and with its conical projection - into the stop ring mounted on the inner shoulder of the cone.

EFFECT: simplified design and increased operation reliability.

3 cl, 1 dwg

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