RU2660239C1 - Valve plug of wedge gate valve and wedge gate valve - Google Patents

Abstract

FIELD: valves industry.

SUBSTANCE: invention relates to valve industry and can be used in the production, operation and maintenance of wedge gate valves (WGV), used as a shut-off valve work environment with high-pressure and high temperature on the pipelines of the technological systems of nuclear power plants (NPPs), thermal power plants (TPPs), as well as in main oil and gas pipelines in normal operation systems and in safety-related systems. To improve manufacturability of the manufacturing and repair, to improve reliability of the operation, to reduce the weight and dimensions of the valve plug of wedge gate valve(WGV), while maintaining and increasing the level of tightness at the contact points of the sealing surfaces (SS) of the wedge disks and the case, the valve plug of WGV is made in the form of a wedge formed by two disks with sealing surfaces and a ball-and-socket hinge (SH) located between the discs, and with the mean of swivel joint of the discs to each other, made in the form of two upper and lower ball-and-socket hinge-shaped I-beam keys arranged with a gap in the T-shaped grooves in the discs, with the possibility of disc movement relative to each other on the SH. WGV contains the case with an inclined SS, the valve plug in the form of wedge, formed by two disks with SS and SH located between the discs, and the mean for swivel joint of the discs to each other, made in the form of two upper and lower ball-and-socket hinge-shaped I-beam keys arranged with a gap in the T-shaped grooves in the discs, with the possibility of disc movement relative to each other on the SH and self-adjustment of the wedge disks in the SS of the case. SH located between the disks of the wedge is made in the form of bushings-lenses installed into the recesses of disks, one of which is made with a convex spherical surface, and the other with a concave spherical surface.

EFFECT: improving manufacturability of the manufacturing.

13 cl, 9 dwg

Description

Technical field

The invention relates to valve manufacturing, in particular to wedge gate valves, and can be used in the manufacture, operation and repair of wedge gate valves used as shutoff valves for high-pressure and high-temperature fluids in pipelines of technological systems of nuclear power plants (NPPs), nuclear power plants ( Nuclear power plants), thermal power plants (TPPs), and also in trunk oil and gas pipelines in normal operation systems and in systems important to safety.

State of the art

Pipe fittings are used in a number of industries, primarily in the energy sector, for plants and pipelines operating in various environments and extreme conditions: at pressures from thousands of atmospheres to deep vacuum, both at very high and very low temperatures. In this regard, modern valve industry is an independent industry, producing valves for various purposes, sizes and designs.

Pipe fittings of thermal shops of modern power plants is one of the most complex elements of equipment.

More than four thousand units of valves have been installed at one 1000 MW power unit alone; therefore, the issues of designing and manufacturing reliable pipeline valves, the use of special materials, as well as inspection and repair methods are very important [A. Kizhner. Repair of pipeline valves of power plants: Textbook. allowance for prof. training workers in the workplace. - M .: Higher. School, 1986. - 144 p., p. 4].

A widespread variety of pipeline valves designed to shut off the flow of a working medium with a certain tightness are wedge gate valves (wedge gate valves), in which the locking element is made in the form of a wedge and moves perpendicular to the axis of the medium flow, and the sealing surfaces are located at an angle to each other [ GOST R 52720-2007. Pipe fittings. Terms and Definitions].

Known wedge gate valves in which the locking element is a solid wedge, an elastic wedge or a two-disk wedge driven in translational motion by means of a rotating spindle (German: Spindel, “spindle”) or stem (German: Stock - “stick, rod”), which perform the function of kinematic elements transmitting translational effort from the drive or actuator [GOST R 52720-2007. Pipe fittings. Terms and Definitions].

The design of wedge gate valves with an integral or elastic wedge is associated with increased laboriousness in the manufacture and repair of damaged parts due to the need for accurate execution and adjustment of each angle of inclination of the wedge and valve seats to ensure tight contact of the sealing surfaces of the valve in the closed position, as well as jamming of the wedge during prolonged periods valve operation in the “closed” position, as a result of which great efforts are required to move the valve to the “open” position with frequent damage to the actuator .

Known designs of valves with a locking element in the form of a double-disk wedge, which are easier in the technological aspect, but their operation often breaks the tightness at the contact points of the wedge disks with the valve seats in the closed position as a result of insufficiently accurate manufacturing and / or changes during operation tilt angles and wear of the sealing surfaces of the wedge disks from the body seats.

A wedge gate valve is known, comprising a housing with inlet and outlet nozzles, in the passage openings of which saddles are installed, and a movable locking element. Guide grooves and protrusions are made on the respective surfaces of the locking element and the housing. One of the contact surfaces of the locking member is perpendicular to the axis of the housing passage opening. The second contact surface of the movable locking member is made with an angle of inclination to the axis of the passage opening with the formation of a sealing wedge effect. The distance from the contact surface perpendicular to the axis of the passage hole to the guide wall facing it is not less than the distance from the lower contact point of the surface seat to the opposite wall of the guide [RU 2094682 F16K 3/12. Publ. 10/27/1997].

A wedge gate valve with self-aligning seats is known, comprising a body, a cover, a hard wedge and self-aligning seats installed in a housing bore. The seats are sealed relative to the body by rings of plastic material [RU 2153115 F16K 3/12. Publ. 07/20/2000].

The disadvantage of such known designs of valves with a hard wedge is poor tightness due to errors in the processing of the hard wedge, as well as the complexity of manufacture and insufficient reliability of the valve due to the ductility of the sealing material, which under the action of the hard wedge and the working medium loses its properties and is deformed during operation .

A wedge gate valve is known, comprising a housing, a cover, an stuffing box, a spindle, a rod, disks, a flywheel, a spindle nut, a conical sleeve, a cylindrical rod, in which, to ensure reliable operation, compensate for deviations of the angles of conical surfaces during manufacture, and save on the valves flowing through the flow part working environment as a result of increased tightness, the coupling of the cylindrical rod with the disks is made on a sphere, the disks are made cylindrical and inserted into a conical holder, and the ratio of the diameter of the cyl ndricheskogo rod and the disk is selected 1: 7 [RU 44781 F16K 3/12. Publ. 03/27/2005].

The disadvantage of RU 44781 is the presence of a fastening disc holder, increasing the overall dimensions of the locking assembly, as well as the possibility of changing the relative position of the discs only relative to the axis of the cylindrical rod.

The closest in technical essence and the achieved result (prototype) is a wedge gate valve, comprising a housing with sealing surfaces and with disks located in them, mounted on a movable stem using a T-shaped groove made in the form of grooves on the disks. In the central parts of the disks, from the sides of their abutment to each other, a special cavity shape is made in which a boss of a cylindrical shape with spherical end surfaces is located to form a hinge between the disks. The boss forms a wedge with disks of a wedge-shaped shape with an angle varying by an interdisc hinge (from 10 to 0 °) relative to the axis of rotation of the stem depending on the displacement of the disks relative to the sealing surfaces of the housing, as a result of which the disks can be moved around the spherical surfaces of the boss and a more snug fit of the disks to the valve body. This reduces the adjustment during assembly and improves maintainability due to the possibility of less accurate fitting of the disks to the sealing surfaces of the housing [RU 2191941 F16K 3/312. Publ. 10.27.2002 (prototype)].

The disadvantage of the prototype according to RU 2191941 is the technological complexity of manufacturing special recesses in the disks with spherical surfaces under the spherical ends of the boss, as well as the lack of means for securing the disks relative to each other, which leads to the disks jumping off the rod in the open position and removing the valve from normal mode functioning.

A common disadvantage of the known designs of locking elements and wedge gate valves in general is insufficient tightness due to deviations and changes in angles and relative positions of sealing surfaces due to the complexity and inaccuracy of the processing of mating sealing surfaces during their manufacture and their deformation and wear during the operation of wedge gate valves, which leads to to leakage, as well as the lack of means of movable mounting of the disks relative to each other, which lead to become detached from the drive rod and the valve spindles in the "open" and a corresponding termination of the normal operation of valves.

Task and technical result

The objective of the invention is to eliminate the technical disadvantages of the known designs of locking elements and wedge gate valves in general.

The technical result in the implementation and industrial implementation of the proposed wedge gate valve is to increase the manufacturability and repair, increase the reliability of operation, reduce the mass and dimensions of the locking element of the wedge gate valve while maintaining and increasing the level of tightness of the wedge gate valve at the contact points of the sealing surfaces of the wedge disks and the casing.

Disclosure of the invention

A characteristic distinguishing feature of the proposed locking element of the wedge gate valve and the wedge gate valve as a whole is the original design of the locking element in the form of a wedge containing two disks movably connected to each other by means of a movable connection of the disks to each other relative to the spherical hinge of the original design located between the disks in the central part the ability to change the relative position of the disks in a certain range and self-aligning tight fit the sealing surfaces of the wedge disks and the housing to each other in the “closed” valve position, and the wedge disks on one side are mainly perpendicular to the axis of the nozzles for supplying and discharging the working medium and the direction of movement of the working medium, and on the other hand, at an angle with a predominant inclination ( taper) 1:10.

Mutual movable connection of the disks to each other relative to the spherical joint located between the disks in the central part of the spherical hinge is ensured by two-dowels installed with a gap in the recesses of the wedge disks, reliably and movably connecting the disks to each other with the possibility of maintaining the integrity of the wedge assembly in the open position and with the possibility of movement of the disks in a certain range relative to each other on a spherical joint located in the central part between the disks with a change in the angle of the wedge and tight self-installation of the wedge in the valve seats in the "closed" position, resulting in significantly increased tightness, reliability of operation and manufacturability of the manufacture and repair of the wedge valve.

The problem is solved, and the required technical result is achieved by the fact that the locking element of the wedge gate valve according to the invention is made in the form of a wedge formed by two disks with sealing surfaces and a spherical hinge located between the disks, and with the means of movable connection of the disks to each other, made in the form of two I-keys located above and below the spherical hinge, installed with a gap in the T-grooves in the disks with the possibility of movement of the disks relative to each other and on a spherical joint.

In this case, the spherical hinge located between the wedge disks is made in the form of bushings-lenses installed in the recesses, one of which is made with a convex spherical surface, and the other with a concave spherical surface with the possibility of installing washers under the bushings-lenses in the inner recesses of the disks regulation of the distance between the sealing surfaces of the disks in accordance with the distance between the sealing surfaces of the housing.

In this case, the wedge disks from the sides facing each other are made mainly perpendicular to the direction of movement of the working medium, and from the other sides they are made at an angle with a predominant inclination of 1:10, the sealing surfaces of the wedge disks are made with a wear-resistant deposited coating and are made with the possibility of attaching means to the wedge translational movement of the wedge in the body of the wedge gate valve in the form of a rod or spindle.

The problem is solved, and the required technical result is achieved by the fact that the wedge gate valve according to the invention contains

housing with angled sealing surfaces,

a locking element in the form of a wedge formed by two disks with sealing surfaces and a spherical joint located between the disks,

and means for movingly connecting the disks to each other, made in the form of two I-keys located above and below the spherical hinge, installed with a gap in the T-grooves in the disks with the possibility of disks moving relative to each other on a spherical hinge and wedge disks self-installing in the sealing surfaces of the case .

Moreover, the spherical hinge located between the wedge disks is made in the form of lens bushings installed in the recesses of the lenses, one of which is made with a convex spherical surface, and the other with a concave spherical surface, with the possibility of installing washers under the bushings of the lenses in the inner recesses of the lenses to control the distance between the sealing surfaces of the disks in accordance with the distance between the sealing surfaces of the housing.

In addition, the wedge disks from the sides facing each other are predominantly perpendicular to the direction of movement of the working medium, and on the other sides are made at an angle with a predominant inclination of 1:10.

The wedge gate valve contains a means of translating the wedge in the valve body connected to the wedge to the operating position of the valve “open” / “closed” in the form of a rod or spindle driven by a mechanical, electrical, electromechanical, or other actuator similar to the functions performed, sealing surfaces in the housing the valves are made in the form of bushings with seats located at an angle to the sealing surfaces, and the sealing surfaces of the valve body and the wedge disks are made with wear-resistant surfacing coating.

Brief Description of the Drawings

In FIG. 1 shows a frontal section, and in FIG. 2 is a side view of an embodiment of a wedge gate valve showing wedge disks 1 with highlighted black sealing surfaces and a spherical hinge located between the disks, made in the form of sleeve-lens disks installed in the internal recesses, one of which 4 is made with a convex spherical surface, and the other 5 - with a concave spherical surface, the valve body of the valve 6 with the bushings 7 installed in it with the sealing surfaces located at an angle, the housing cover 8 with Verstov spindle or rod 9, driven by a mechanical or electrical actuator 10.

In FIG. 3 is a general view of the wedge gate valve assembly with a quarter cutout in the body and cover.

In FIG. 4 shows a general view of a locking element of a wedge gate valve assembly.

In FIG. 5 is an exploded view of a locking element of a wedge gate valve, showing wedge disks 1 with highlighted black sealing surfaces installed in the internal recesses of the lens-sleeve disks, one of which 4 is made with a convex spherical surface and the other 5 with a concave spherical surface, upper connection key 2 and lower connection key 3.

Figure 6 shows a cross section of the locking element of the wedge gate valve, where the wedge disks 1 are shown with black sealing surfaces and a spherical hinge located between the disks made in the form of lens-sleeve disks installed in the internal recesses, one of which 4 is made with a convex spherical surface, and the other 5 - with a concave spherical surface.

In the embodiment shown in the drawings, the disks are movably connected to each other by an upper connecting two-tee key 2 and a lower connecting two-tee key 3.

Each of the disks of the wedge 1 is made from the inner sides with respect to each other mainly perpendicular to the axis of the nozzles for supplying and discharging the working medium and the direction of movement of the working medium, and on the other, at an angle with a predominant inclination (taper) of 1:10 with a wedge-shaped arrangement of the sealing surfaces of the disks wedge.

The horizontal axis shown in the drawings is the axis of the direction of movement of the working medium, and the inclined axes are the axis of processing of the sealing surfaces and the axis of rotation of the disks on a spherical hinge relative to the normal taper of the wedge disks.

In FIG. 7 and 8 show an embodiment of the spherical hinge between the disks in the form of two lens bushings installed in the internal recesses of the disks, one of which (Fig. 7) is made with a convex spherical surface and the other (Fig. 8) with a concave spherical surface, with central holes for mounting the lens sleeves in the internal recesses of the disks 1.

In FIG. 9 shows a General view of the connecting keys in the I-beam design.

The implementation and industrial implementation of the invention

The proposed wedge gate valve in FIG. 1-9 variant of the design contains the locking element in the form of a wedge formed by two disks 1 with sealing surfaces and a spherical hinge located between the disks made in the form of sleeve-lens disks installed in the internal recesses, one of which 4 is made with a convex spherical surface, and the other 5 - with a concave spherical surface.

The wedge gate valve body 6 comprises sleeve-saddles 7 mounted therein with wedge-shaped sealing surfaces.

The housing cover 8 contains an opening for the wedge translational movement of the wedge in the form of a spindle or rod 9, driven by a mechanical, electrical, pneumatic or other drive 10 similar in function.

The wedge disks from the sides located to each other are made mainly parallel to each other and perpendicular to the axis of the nozzles and the direction of movement of the working medium, and on the other, at an angle with a predominant inclination (taper) of 1:10.

Relatively to each other, the disks 1 are movably connected by means of two I-keys 2 and 3 located respectively above and below the spherical hinge between the disks and freely placed in the corresponding T-shaped recesses of the disks.

The spherical hinge is located in the central part between the wedge disks and is mainly made in the embodiment shown in the drawings in the form of two lens bushings 4 and 5, one of which 5 is made with a convex surface, the other 4 with a concave surface with the possibility of articulating with each other the other and the corresponding rotation of the wedge disks 1 relative to each other in the range limited by the keys 2 and 3 with changes in the angle of inclination of the sealing surfaces of the wedge disks relative to each other and relative to lotnitelnyh surfaces mounted in the housing 6, the sleeves 7-saddles block valve assembly.

The disks of the wedge 1 are made on one side mainly perpendicular to the axis of the nozzles and the axis of the direction of movement of the working medium, on the other hand, at an angle with a predominant inclination of 1:10 and movably connected to each other by means of I-keys 2 and 3.

The upper 2 and lower 3 connecting I-keys are mounted respectively on the top and bottom of the spherical hinge in the respective recesses of the wedge disks with a gap, so that the wedge disks can freely move relative to each other on a spherical joint located between the disks.

The locking element of the wedge gate valve described above is intended for use in a wedge gate valve, structurally comprising a housing 6 with nozzles for supplying and discharging a working medium, a cover with an opening for a spindle or rod, a spindle or rod 9 with a wedge connected to it on one side and formed by two disks 1 and, on the other hand, connected to a mechanical or electrical drive 10.

The wedge is assembled from two disks 1, between which a spherical hinge with spacer washers-spacers is placed, with the help of which the correct width of the assembled wedge is provided in accordance with the distance between the sealing surfaces of the housing.

The relative position of the wedge disks is fixed with I-keys.

The nozzles for supplying and discharging the working medium of the wedge gate valve can be welded, with flange or other connections to the working medium pipeline.

The valve may be provided with position indicators of the locking element.

Housing parts, parts of the locking element and the drive are made of commonly used material, for example, corrosion-resistant steel, and the sealing surfaces are made of wear-resistant sealing welds, for example, according to NP-068-05, and the seal of the attachment points of the housing cover and stuffing box packing are made of thermally expanded graphite.

The inventive locking element for a wedge gate valve and a wedge gate valve are made of commonly used materials using conventional manufacturing techniques of pipe fittings, taking into account the conditions of their operation.

The inventive wedge gate valve operates as follows:

By means of a mechanical or electric or other drive 10, translational motion is transmitted to the spindle or rod 9 connected to the wedge of two disks 1. As a result, the wedge disks lower or rise depending on the direction of rotation of the actuator 10, closing or opening the passage section of the housing 6 with translation into working valve position “closed” / “open”.

The rotation is transmitted from the drive by means of a key or cam connection. The rotational movement of the actuator translates into the translational motion of the rod connected to the wedge, which moves along the guides of the housing, opening or closing the bore of the valve.

An advantage of the claimed invention lies in the fact that the proposed design of the wedge of the wedge gate valve and the wedge gate valve as a whole make it possible to ensure their reliable operation, to compensate for deviations of the angle of inclination of the sealing surfaces of the wedge during manufacture and operation, to save the working medium flowing through the flow part of the valve, as a result of high tightness provided by a self-installing hermetic arrangement of wedge disks in the bore of the valve body.

The structural and technological features of the inventions of the group that have been described in detail above prove not only the causal relationship of the essential features and the technical result, but also prove the feasibility of the industrial realization of the invention and the confident achievement of the technical result, namely, with the industrial realization of the invention, the manufacturability and repair are improved, reliability is improved functioning, reducing the mass and dimensions of the wedge for the wedge gate valve (stop valve wedge new valve) while maintaining and increasing the level of tightness of the locking surfaces of the wedge gate valves at the contact points of the sealing surfaces of the wedge disks with the sealing surfaces in the wedge gate valve body.

Given the novelty of the set of essential features, the technical solution of the problem, the inventive step and the relevance of all the general and particular features of the invention, proved in the section "prior art" and "Summary of the invention", proved in the section "Implementation and industrial implementation of the invention", technical feasibility and industrial the applicability of the invention, the solution of tasks and the confident achievement of the required technical result in the implementation and use of the invention, claimed the group of inventions satisfies all the eligibility requirements for inventions.

The analysis also shows that all the general and particular features of the invention are essential, since each of them is necessary, and together they are not only sufficient to achieve the purpose of the utility model, but also allow the invention to be implemented in an industrial way.

In addition, the analysis of the set of essential features of the invention and achieved by using a single technical result shows the presence of a single inventive concept, close and inextricable connection between the inventions of the group, the use of the locking element of the wedge gate valve directly in the wedge gate valve, which allows combining the two inventions in one application.

Claims (16)

1. The locking element of the wedge gate valve, characterized in that it is made in the form of a wedge formed by two disks with sealing surfaces and a spherical hinge located between the disks, and with means for movably connecting the disks to each other, made in the form of two I-beams located on top and bottom keys installed with a gap in the T-grooves in the disks with the possibility of movement of the disks relative to each other on a spherical hinge. 2. The wedge gate locking element according to claim 1, characterized in that the spherical hinge located between the wedge disks is made in the form of lens bushings mounted in the recesses, one of which is made with a convex spherical surface and the other with a concave spherical surface. 3. The locking element of the wedge gate valve according to claim 1, characterized in that the spherical hinge is arranged to be installed under the lens bushings in the inner recesses of the disk washers-gaskets to control the distance between the sealing surfaces of the disks in accordance with the distance between the sealing surfaces of the housing. 4. The locking element of the wedge gate valve according to claim 1, characterized in that the wedge disks on the sides facing each other are predominantly perpendicular to the direction of movement of the working medium, and on the other sides are made at an angle with a preferred inclination of 1:10. 5. The locking element of the wedge gate valve according to claim 1, characterized in that it is configured to attach to the wedge means of translational movement of the wedge in the body of the wedge gate valve in the form of a rod or spindle. 6. The locking element of the wedge gate valve according to claim 1, characterized in that the sealing surfaces of the wedge disks are made with a wear-resistant weld coating. 7. Wedge gate valve, characterized in that it contains housing with angled sealing surfaces, a locking element in the form of a wedge formed by two disks with sealing surfaces and a spherical joint located between the disks, and means for movable connection of the disks to each other, made in the form of two I-keys located at the top and bottom of the spherical hinge, installed with a gap in the T-grooves in the disks with the possibility of disks moving relative to each other on a spherical hinge and wedge disks in the sealing surfaces of the housing . 8. A wedge gate valve according to claim 7, characterized in that the spherical hinge located between the wedge disks is made in the form of lens bushings installed in the recesses, one of which is made with a convex spherical surface and the other with a concave spherical surface. 9. A wedge gate valve according to claim 7, characterized in that the spherical hinge is arranged to be installed under the lens bushings in the inner recesses of the disk washers-gaskets to control the distance between the sealing surfaces of the disks in accordance with the distance between the sealing surfaces of the housing. 10. A wedge gate valve according to claim 7, characterized in that the wedge disks on the sides facing each other are predominantly perpendicular to the direction of movement of the working medium, and on the other sides are made at an angle with a predominant inclination of 1:10. 11. A wedge gate valve according to claim 7, characterized in that it comprises a means for translating the wedge in the valve body connected to the wedge to the operating positions of the valve “open” / “closed” as a rod or spindle, driven by mechanical, electrical, electromechanical or other similar drive functions performed. 12. A wedge gate valve according to claim 7, characterized in that the sealing surfaces in the valve body are made in the form of bushings and seats with angled sealing surfaces. 13. A wedge gate valve according to claim 7, characterized in that the sealing surfaces of the valve body and the wedge disks are made with a wear-resistant surfaced coating.

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