RU2743872C1 - Spindle support-sealing assembly of wedge gate valve for underground pipelines - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to valve manufacturing, and can be used in oil and gas production, petrochemical and power engineering. Spindle SSA of wedge gate valve for underground pipelines, including body with wedge lock and cover, in which spindle of wedge lock movement is located, comprises female spindle, sealing unit from sealing elements, arranged in cylindrical cavity, limited by a bottom with central hole, made with possibility of spindle free movement in it, with belt-like arrangement on the bottom of said sealing elements, which are elastic. In the cylindrical cavity concentrically to the spindle between the sealing elements there is a lining ring, and from above there is a support ring. Above the support ring there is a block of sliding seals, with the upper end of which the flange of the cover is conjugated with the possibility of axial compression of sealing elements of the unit by means of threaded attachment of the flange to the cover. Unit has tightness control channel. Cylindrical cavity consists of two cylindrical chambers of different diameter, smaller of which is a sealing unit. In smaller chamber there is at least one sealing element made in form of annular cuff made of elastic resilient material heat-resistant at temperature (−60 °C)–(+110 °C) U-shaped cross-section with a shelf and side walls oriented towards gate valve body. Lower sealing element of the first tier is installed on the bottom of the smaller chamber. On the flange of the sealing element of the next tier there are lining rings, which are made of bronze and have adjustable mounting thickness, with possibility of tight fit of collars in sealing unit in space from bottom of lower chamber to support bronze ring, conjugated with upper cuff flange and made two-stage. Upper mounting part of the support ring is equal to the diameter of the cylinder of the larger chamber. Its lower support part has a geometrical surface corresponding to the mounting surface adjoining it in the smaller chamber. Backing ring is installed on top of sealing elements, and on it there are thrust semi-rings of bronze, having outer cylindrical surface with diameter equal to diameter of upper chamber cylinder, conjugated with corresponding cylindrical recess, made in case cover, and inner cylindrical surface with diameter not less than spindle diameter. Sealing elements of the unit of sliding seals are made in the form of rings out of thermally expanded graphite.

EFFECT: technical result of using invention consists in improvement of reliability of wedge gate valve at exclusion of current maintenance to planned repair at its underground location.

6 cl, 11 dwg

Description

The invention relates to the field of mechanical engineering, namely to valve engineering, and can be used in oil and gas, petrochemical, energy and other industries.

Known is a support-sealing unit of a wedge valve spindle, which includes a body with a wedge lock and a cover in which the spindle for moving the wedge lock is located, containing, covering the spindle, a sealing unit of sealing elements located in a cylindrical cavity bounded by a bottom with a central hole made with the possibility of free movement of the spindle in it, with a tiered placement on the bottom of the mentioned sealing elements, which are made elastic, and in the cylindrical cavity concentric with the spindle between the sealing elements there is a lining ring, and a support ring is placed on top, while a block of sliding seals is placed above the support ring, with the upper end of which is mated with a cover flange with the possibility of axial compression of the assembly's sealing elements by means of threaded fastening of the flange to the cover, and a leakage control channel (patent RU 176497, IPC F16K 41/04 (2006.01), F16J 15/16 (2006.01), Pubb jubilant: 01/22/2018 Bull. Number 3).

This technical solution is the closest to the invention in terms of the technical essence and the achieved result, therefore, it is taken as a prototype.

The disadvantages of the technical solution include the low reliability of the underground version of the wedge gate valve, if regular routine maintenance is required between scheduled repairs.

In addition, the device during operation has the costs of replacing the stuffing box seals, costs due to the loss of the pumped medium in the case of a classic stuffing box, it does not allow the device to be used in an underground version.

The technical result from the use of the invention is to increase the reliability of the wedge valve while excluding routine maintenance before scheduled repairs when it is located underground.

Below are disclosed all the general and particular essential features of the invention, characterizing their causal relationship with the specified technical result, sufficient for the implementation of a specialist in this field of technology.

The supporting-sealing unit of the spindle of the wedge valve for underground pipelines, including a body with a wedge lock and a cover in which the spindle for moving the wedge lock is located, contains, covering the spindle, a sealing unit from sealing elements placed in a cylindrical cavity bounded by a bottom with a central hole, made with the possibility of free movement of the spindle in it, with tiered placement on the bottom of the mentioned sealing elements, which are made elastic. In the cylindrical cavity concentric with the spindle between the sealing elements, a lining ring is installed, and a support ring is placed on top. Above the support ring there is a block of sliding seals, with the upper end of which the lid flange is mated with the possibility of axial compression of the sealing elements of the assembly by means of threaded fastening of the flange to the lid. The unit has a tightness control channel. The cylindrical cavity consists of two cylindrical chambers of different diameters, the smaller of which is a sealing unit. In the smaller chamber, at least one sealing element is installed, made in the form of an annular cuff made of an elastic elastic material heat-resistant at a temperature of (-60 ° C) - (+ 110 ° C) of a U-shaped cross-section with a shelf and side walls oriented towards the valve body. The lower sealing element of the first tier is installed on the bottom of the smaller chamber. On the shelf of the cuff of the sealing element of the next tier, the indicated lining rings are placed, which are made of bronze and have an adjustable mounting thickness, with the possibility of ensuring a tight fit of the cuffs in the sealing unit in the space from the bottom of the lower chamber to the support bronze ring, coupled with the shelf of the upper cuff and made in two stages ... The upper, seating part of the support ring is equal to the diameter of the cylinder of the larger chamber, the lower seating part of it has a geometric surface corresponding to the adjacent seating surface in the smaller chamber. The backing ring is installed on top of the sealing elements, and on it are placed thrust half rings made of bronze, having an outer cylindrical surface with a diameter equal to the diameter of the cylinder of the upper chamber, conjugated with a corresponding cylindrical recess made in the housing cover and an inner, cylindrical surface with a diameter not less than the diameter of the spindle. The sealing elements of the sliding seal block are made in the form of thermally expanded graphite rings. The lower support part of the support bronze ring may have a cylindrical surface with a diameter equal to the diameter of the cylinder of said smaller chamber or a conical surface identical to the conical cut of the mating hole of the smaller chamber. The ends of the thrust half-rings are made with inwardly inclined cuts of the outer cylindrical surface. An annular bronze plain bearing can be installed between the end face of the sliding seal block and the cover flange. The upper and lower sealing elements of the sliding seal unit can be equipped with seals.

The device is illustrated by drawings, where:

in fig. 1 shows a general view of the gate valve at the installation site; in fig. 2 - view I in Fig. 1 shows a partial longitudinal section; in fig. 3 - view I in Fig. 1, partial longitudinal section of the cover; in fig. 4 - view I in FIG. 1, partial longitudinal section, version with two cuffs, two half rings and with seals; in fig. 5 - view I in Fig. 1, partial longitudinal section, version with three cuffs and two persistent half rings; in fig. 6 - view I in FIG. 1, partial longitudinal section, an embodiment of a support ring; in fig. 7 - longitudinal section of the cuff; in fig. 8 is a longitudinal section of the support-sealing assembly; in fig. 9 is a cross-section a-a in FIG. 6; in fig. 10 - cross section b-b in Fig. 8; in fig. 11 - installation of a persistent half ring.

The support-sealing unit, hereinafter referred to as the OSU of the spindle 1 of the wedge valve 2 for underground pipelines (not shown), includes a body 3 with a wedge lock (not shown) and a cover 4, in which the spindle 1 for moving the wedge lock is located.

OSU contains, covering the spindle 1, the BG sealing unit, consisting of sealing elements 5.

The sealing unit is located in the cylindrical cavity L, the cover 4, limited by the bottom S with a central hole made with the possibility of free movement of the spindle 1 therein, with the tiered placement on the bottom S of the mentioned sealing elements 5, which are made elastic.

In the cylindrical cavity L concentric with the spindle 1 between the sealing elements 5, a lining ring 6 is installed, and a support ring 7 is placed on top.

Above the support ring 7 there is a block of sliding seals BSU, with the upper end of which the flange 8 of the cover 4 is connected with the possibility of axial compression of the sealing elements 9 of the BSU by means of threaded fastening 10 of the flange 8 to the cover 4.

OSU has channel 11 for tightness control.

The cylindrical cavity L consists of two cylindrical chambers of different diameters, the smaller 12 of which is the BG sealing unit.

In the smaller chamber 12, at least one sealing element 5 is installed, made in the form of an annular cuff (Fig. 7) of an elastic elastic material heat-resistant at a temperature of (-60 ° C) - (+ 110 ° C) of a U-shaped cross-section with a shelf 13 and side walls 14 oriented towards the body 3 of the valve 2.

The lower sealing element 5 of the first tier is installed on the bottom S of the smaller chamber 12.

On the shelf 13 of the cuff 5 of the sealing element of the next tier, the indicated lining rings 6 are placed, which are made of bronze and have an adjustable mounting thickness, with the possibility of ensuring a tight fit of the cuffs 5 in the sealing unit in the space from the bottom S of the lower chamber to the support bronze ring 15, mated with shelf 13 of the upper cuff 5 and made in two stages.

The upper, seating part of the support ring 15 is equal to the diameter of the cylinder of the larger chamber 16.

Its lower support part has a geometric surface corresponding to the mating seating surface in the smaller chamber 13.

The backing ring 6 is installed on top of the sealing elements 5, and on it are placed thrust half rings 17 made of bronze, having an outer cylindrical surface with a diameter equal to the diameter of the cylinder of the upper chamber 16, conjugated with a corresponding cylindrical recess made in the cover 4 of the body 3 and an inner, cylindrical surface with a diameter not smaller spindle diameter 1.

The sealing elements 18 of the block of sliding seals are made in the form of rings made of thermally expanded graphite.

The lower support part of the support bronze ring 15 can have a cylindrical surface with a diameter equal to the diameter of the cylinder of said smaller chamber 12 (Fig. 6) or a conical surface (Fig. 4) identical to the conical cut of the mating hole of the smaller chamber 12.

The ends of the stop half rings 17 are made with inwardly inclined cuts of the outer cylindrical surface.

Between the end of the block of sliding seals and the flange 8 of the cover 4, a thrust sleeve 19 with an annular bronze plain bearing 20 can be installed.

The upper and lower sealing elements 18 of the sliding seal unit can be equipped with seals 21.

Comparison of the claimed technical solution with the prior art known from scientific, technical and patent documentation as of the priority date in the main and adjacent headings did not reveal a tool that has features identical to all features contained in the claims proposed by the applicant, including the characteristics of the purpose. That is, the set of essential features of the claimed solution was not previously known and is not identical to any known technical solutions, therefore, it meets the "novelty" condition of patentability.

The invention is feasible and reproducible, and the distinctive features given in the claims are essential, since they affect the possibility of solving the technical problem indicated in the application and obtaining the technical result provided by the invention - increasing the reliability of the wedge valve with the exclusion of routine maintenance before scheduled repair when it is underground , that is, are in a causal relationship with the specified result.

This technical solution is industrially applicable, since its purpose is indicated in the description of the application and the title of the invention, it can be carried out in an industrial way, and the distinctive features given in the claims make it possible to obtain a new technical result.

The invention in the form as it is characterized in the claims can be carried out using the means and methods described in the patent of the Russian Federation RU 176497, which became generally available before the priority date of the invention

Therefore, the claimed technical solution meets the "industrial applicability" requirement of patentability.

An analysis of known technical solutions in this field of technology showed that the proposed technical solution does not follow explicitly from the prior art for a specialist, since no solutions have been identified that have features that coincide with its distinctive features, and in the identified such solutions, the knowledge of the influence of distinctive features on the technical result specified in the application materials.

Those. The claimed solution has features that are absent in the known technical solutions, and the use of these features in the claimed set of essential features makes it possible to obtain a new technical result - an increase in the reliability of a wedge gate valve for underground installation.

Consequently, the proposed technical solution can only be obtained by a creative approach and is not obvious to the average specialist in this field, i.e. has an inventive step in comparison with the state of the art.

To confirm the possibility of carrying out the invention, information on the operation of the device is given below, revealing how the invention can be implemented with the implementation of the purpose indicated by the applicant and with confirmation of the possibility of achieving a technical result when implementing the invention.

The support-sealing unit of the spindle 1 is implemented in the wedge valves of underground pipelines used for transporting liquid and gaseous media (mainly flammable).

Wedge gates are installed underground so that the support-sealing unit of the spindle is under the horizon of backfilling of soil (Fig. 1), which gives specific conditions for its operation - the seal of the spindle in this case is maintenance-free. There is no need to check the tightness of the seal.

The support-sealing unit (OSU) is assembled as follows: when assembling the valve, a collar 5, a backing ring 6, a split ring 17, a collar 5, a support ring 15, rings made of thermally expanded graphite 18, bushing 19, flange are sequentially installed in the cavity L of the cover 4 8, threaded attachment means 10.

The OSU works as follows: at the pressure of the working medium under the cover 4, the cuffs 5, resting against the shelf 13 against the backing rings 6, open the side walls 14.

In this case, the side walls 14 of the cuff seal the spindle 1 and the cover 4.

In the event of mechanical wear of the cuffs 5 when the service life is exceeded, the working medium will be sealed with O-rings 18 made of thermally expanded graphite.

The side walls 14 of the collar 5i constructively ensure the tightness of the spindle 1 and the cover 4 at a pressure twice the operating pressure of the valve (up to 40 MPa).

Thrust half rings 17 serve as a support surface for the cuff 5.

With overpressure under the cover 4, the collar 5 seals the side surfaces (cavities L in the cover 4 and the spindle 1), and the collar 5 is pushed out of the cover 4 by pressure.

But in the groove of the cover 4, support half rings 17 are installed.

And the cuff 5 abuts against the persistent half rings 17.

If you use a whole, continuous ring, then it will not be able to fit into the groove of the cover 4, due to the fact that the outer diameter of the ring is greater than the inner diameter of the cover 4.

If no flats are made on the half ring 17, then it will not be able to insert into the groove of the cover 4, due to the fact that the outer edges of the ring will not allow the ring to enter the inner diameter of the cover 4.

Thus, the ingress of the working medium on the sliding seals 18 is minimized, which additionally prevent the transported medium from escaping into the atmosphere by pressing the rings 18 of thermally expanded graphite by means of the threaded fastener 10.

The use of OGU increases the reliability of the gate valve and the service life before scheduled repair, and also eliminates the costs of servicing the valve, replacing stuffing box seals, the cost of losing the pumped medium in the case of a classic stuffing box, makes it possible to install the valve underground in a maintenance-free version.

The main advantages of the new device include the high reliability of the valve due to the efficient operation of the OSU.

This OSU can be used in underground gate valves in oil and gas, petrochemical, energy and other industries.

Claims (6)

1. Supporting and sealing unit of the spindle of a wedge valve for underground pipelines, including a body with a wedge lock and a cover, in which the spindle for moving the wedge lock is located, containing a sealing block covering the spindle of sealing elements, located in a cylindrical cavity bounded by a bottom with a central hole , made with the possibility of free movement of the spindle in it, with a tiered arrangement on the bottom of the mentioned sealing elements, which are made elastic, and in the cylindrical cavity concentrically to the spindle between the sealing elements a lining ring is installed, and a support ring is placed on top, while a block of sliding seals, with the upper end of which the lid flange is mated with the possibility of axial compression of the sealing elements of the assembly by means of threaded fastening of the flange to the lid, and a tightness control channel, characterized in that the specified cylindrical The lid consists of two cylindrical chambers of different diameters, the smaller of which is a sealing unit, in which at least one sealing element is installed, made in the form of an annular cuff made of an elastic elastic material heat-resistant at a temperature of (-60 ° C) - (+ 110 ° C ) U-shaped cross-section with a shelf and side walls oriented towards the valve body, while the lower sealing element of the first tier is installed on the bottom of the smaller chamber, and the indicated lining rings are placed on the shelf of the cuff of the sealing element of the next tier, which are made of bronze and have adjustable mounting thickness, with the possibility of ensuring a tight fit of the cuffs in the sealing unit in the space from the bottom of the lower chamber to the support bronze ring, conjugated with the shelf of the upper cuff and made in two stages, the upper landing part of which is equal to the diameter of the cylinder of the larger chamber, and the lower support part has a geometric surface corresponding to the mating seating surface in the smaller chamber, and the backing ring is installed on top of the sealing elements, and on it are placed thrust half rings made of bronze, having an outer cylindrical surface with a diameter equal to the diameter of the cylinder of the upper chamber, conjugated with the corresponding cylindrical recess made in the cover body, and an inner cylindrical surface with a diameter not less than the diameter of the spindle, while the sealing elements of the block of sliding seals are made in the form of rings of thermally expanded graphite. 2. Support-sealing assembly according to claim 1, characterized in that the lower support part of the support bronze ring has a cylindrical surface with a diameter equal to the diameter of the cylinder of said smaller chamber. 3. Support-sealing unit according to claim 1, characterized in that the lower support part of the support bronze ring has a conical surface identical to the conical cut of the mating hole of the smaller chamber. 4. The support-sealing unit according to claim 1, characterized in that the ends of the thrust half-rings are made with inwardly inclined sections of the outer cylindrical surface. 5. The support-sealing unit according to claim 1, characterized in that an annular bronze sliding bearing is installed between the end face of the block of sliding seals and the flange of the cover. 6. Support-sealing assembly according to claim 1, characterized in that the upper and lower sealing elements of the sliding seal unit are equipped with seals.

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